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Third-Party: Add libpng

This commit is contained in:
Jeffrey Pfau 2015-07-09 23:10:08 -07:00
parent 1ee5ccd1ff
commit 6a426c0891
313 changed files with 159528 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
CMakeLists.txt
View File

@ -9,6 +9,7 @@ endif()
set(USE_CLI_DEBUGGER ON CACHE BOOL "Whether or not to enable the CLI-mode ARM debugger")
set(USE_GDB_STUB ON CACHE BOOL "Whether or not to enable the GDB stub ARM debugger")
set(USE_FFMPEG ON CACHE BOOL "Whether or not to enable FFmpeg support")
set(USE_ZLIB ON CACHE BOOL "Whether or not to enable zlib support")
set(USE_PNG ON CACHE BOOL "Whether or not to enable PNG support")
set(USE_LIBZIP ON CACHE BOOL "Whether or not to enable ZIP support")
set(USE_MAGICK ON CACHE BOOL "Whether or not to enable ImageMagick support")
@ -159,8 +160,10 @@ if(BUILD_GL)
set(BUILD_GL OFF)
endif()
endif()
set(WANT_PNG ${USE_PNG})
find_feature(USE_FFMPEG "libavcodec;libavformat;libavresample;libavutil;libswscale")
find_feature(USE_PNG "ZLIB;PNG")
find_feature(USE_ZLIB "ZLIB")
find_feature(USE_PNG "PNG")
find_feature(USE_LIBZIP "libzip")
find_feature(USE_MAGICK "MagickWand")
@ -321,11 +324,29 @@ if(USE_MAGICK)
set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libmagickwand${MAGICKWAND_DEB_VERSION}")
endif()
if(USE_ZLIB)
list(APPEND FEATURES ZLIB)
include_directories(AFTER ${ZLIB_INCLUDE_DIRS})
list(APPEND DEPENDENCY_LIB ${ZLIB_LIBRARIES})
set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},zlib1g")
endif()
if(WANT_PNG AND USE_ZLIB AND NOT USE_PNG)
set(PNG_STATIC ON CACHE BOOL "" FORCE)
set(PNG_SHARED OFF CACHE BOOL "" FORCE)
set(PNG_TESTS OFF CACHE BOOL "" FORCE)
add_subdirectory(${CMAKE_SOURCE_DIR}/src/third-party/libpng libpng)
set_property(TARGET png16_static PROPERTY INCLUDE_DIRECTORIES ${CMAKE_BINARY_DIR}/libpng;${CMAKE_SOURCE_DIR}/src/third-party/libpng;${ZLIB_INCLUDE_DIRS})
set(PNG_INCLUDE_DIRS ${CMAKE_SOURCE_DIR}/src/third-party/libpng ${CMAKE_BINARY_DIR}/libpng)
list(APPEND DEPENDENCY_LIB png16_static)
set(USE_PNG ON)
endif()
if(USE_PNG)
list(APPEND FEATURES PNG)
include_directories(AFTER ${PNG_INCLUDE_DIRS})
list(APPEND DEPENDENCY_LIB ${PNG_LIBRARIES} ${ZLIB_LIBRARIES})
set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libpng12-0,zlib1g")
set(CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_DEPENDS},libpng12-0")
endif()
if(USE_LIBZIP)
@ -396,7 +417,8 @@ if(NOT BUILD_STATIC AND NOT BUILD_SHARED)
endif()
if(BUILD_SHARED)
add_library(${BINARY_NAME} SHARED ${SRC})
message(STATUS ${DEPENDENCY_TARGETS})
add_library(${BINARY_NAME} SHARED ${SRC} ${DEPENDENCY_TARGETS})
if(BUILD_STATIC)
add_library(${BINARY_NAME}-static STATIC ${SRC})
set_target_properties(${BINARY_NAME}-static PROPERTIES COMPILE_DEFINITIONS "${FEATURE_DEFINES}")

72
src/third-party/libpng/ANNOUNCE vendored Normal file
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@ -0,0 +1,72 @@
Libpng 1.6.17 - March 26, 2015
This is a public release of libpng, intended for use in production codes.
Files available for download:
Source files with LF line endings (for Unix/Linux) and with a
"configure" script
libpng-1.6.17.tar.xz (LZMA-compressed, recommended)
libpng-1.6.17.tar.gz
Source files with CRLF line endings (for Windows), without the
"configure" script
lpng1617.7z (LZMA-compressed, recommended)
lpng1617.zip
Other information:
libpng-1.6.17-README.txt
libpng-1.6.17-LICENSE.txt
libpng-1.6.17-*.asc (armored detached GPG signatures)
Changes since the last public release (1.6.16):
Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
Corrected the width limit calculation in png_check_IHDR().
Removed user limits from pngfix. Also pass NULL pointers to
png_read_row to skip the unnecessary row de-interlace stuff.
Added testing of png_set_packing() to pngvalid.c
Regenerated configure scripts in the *.tar distributions with libtool-2.4.4
Implement previously untested cases of libpng transforms in pngvalid.c
Fixed byte order in 2-byte filler, in png_do_read_filler().
Made the check for out-of-range values in png_set_tRNS() detect
values that are exactly 2^bit_depth, and work on 16-bit platforms.
Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
pngset.c to avoid warnings about dead code.
Do not build png_product2() when it is unused.
Display user limits in the output from pngtest.
Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
and 1-million-row default limits in pnglibconf.dfa, that can be reset
by the user at build time or run time. This provides a more robust
defense against DOS and as-yet undiscovered overflows.
Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
of png.h.
Avoid runtime checks when converting integer to png_byte with
Visual Studio (Sergey Kosarevsky)
Removed some comments that the configure script did not handle
properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
Free the unknown_chunks structure even when it contains no data.
Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
for consistency, and remove some useless tests (Alexey Petruchik).
Remove pnglibconf.h, pnglibconf.c, pnglibconf.pre, pnglibconf.dfn,
and pnglibconf.out instead of pnglibconf.* in "make clean" (Cosmin).
Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
value was wrong. It's not clear if this affected the final stored
value; in the obvious code path the upper and lower 8-bits of the
alpha value were identical and the alpha was truncated to 8-bits
rather than dividing by 257 (John Bowler).
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
to subscribe)
or to glennrp at users.sourceforge.net
Glenn R-P

5214
src/third-party/libpng/CHANGES vendored Normal file
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374
src/third-party/libpng/CMakeLists.txt vendored Normal file
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@ -0,0 +1,374 @@
# CMakeLists.txt
# Copyright (C) 2007-2015 Glenn Randers-Pehrson
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h
cmake_minimum_required(VERSION 2.4.4)
set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")
project(libpng C)
enable_testing()
set(PNGLIB_MAJOR 1)
set(PNGLIB_MINOR 6)
set(PNGLIB_RELEASE 17)
set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
# needed packages
find_package(ZLIB REQUIRED)
include_directories(${ZLIB_INCLUDE_DIR})
if(NOT WIN32)
find_library(M_LIBRARY
NAMES m
PATHS /usr/lib /usr/local/lib
)
if(NOT M_LIBRARY)
message(STATUS "math lib 'libm' not found; floating point support disabled")
endif()
else()
# not needed on windows
set(M_LIBRARY "")
endif()
# COMMAND LINE OPTIONS
option(PNG_SHARED "Build shared lib" ON)
option(PNG_STATIC "Build static lib" ON)
option(PNG_TESTS "Build libpng tests" ON)
# Many more configuration options could be added here
option(PNG_FRAMEWORK "Build OS X framework" OFF)
option(PNG_DEBUG "Build with debug output" OFF)
option(PNGARG "Disable ANSI-C prototypes" OFF)
# SET LIBNAME
set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
# to distinguish between debug and release lib
set(CMAKE_DEBUG_POSTFIX "d")
# Use the prebuilt pnglibconf.h file from the scripts folder
# TODO: fix this by building with awk; without this no cmake build can be
# configured directly (to do so indirectly use your local awk to build a
# pnglibconf.h in the build directory.)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
include_directories(${CMAKE_CURRENT_BINARY_DIR})
# OUR SOURCES
set(libpng_public_hdrs
png.h
pngconf.h
${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h
)
set(libpng_sources
${libpng_public_hdrs}
pngdebug.h
pnginfo.h
pngpriv.h
pngstruct.h
png.c
pngerror.c
pngget.c
pngmem.c
pngpread.c
pngread.c
pngrio.c
pngrtran.c
pngrutil.c
pngset.c
pngtrans.c
pngwio.c
pngwrite.c
pngwtran.c
pngwutil.c
)
set(pngtest_sources
pngtest.c
)
set(pngvalid_sources
contrib/libtests/pngvalid.c
)
set(pngstest_sources
contrib/libtests/pngstest.c
)
# SOME NEEDED DEFINITIONS
if(MSVC)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
endif(MSVC)
if(PNG_DEBUG)
add_definitions(-DPNG_DEBUG)
endif()
# NOW BUILD OUR TARGET
include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})
unset(PNG_LIB_TARGETS)
if(PNG_SHARED)
add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})
set(PNG_LIB_TARGETS ${PNG_LIB_NAME})
if(MSVC)
# msvc does not append 'lib' - do it here to have consistent name
set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")
set_target_properties(${PNG_LIB_NAME} PROPERTIES IMPORT_PREFIX "lib")
endif()
target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})
endif()
if(PNG_STATIC)
# does not work without changing name
set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)
add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})
list(APPEND PNG_LIB_TARGETS ${PNG_LIB_NAME_STATIC})
if(MSVC)
# msvc does not append 'lib' - do it here to have consistent name
set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")
endif()
target_link_libraries(${PNG_LIB_NAME_STATIC} ${ZLIB_LIBRARY} ${M_LIBRARY})
endif()
if(PNG_FRAMEWORK)
set(PNG_LIB_NAME_FRAMEWORK ${PNG_LIB_NAME}_framework)
add_library(${PNG_LIB_NAME_FRAMEWORK} SHARED ${libpng_sources})
list(APPEND PNG_LIB_TARGETS ${PNG_LIB_NAME_FRAMEWORK})
set_target_properties(${PNG_LIB_NAME_FRAMEWORK} PROPERTIES
FRAMEWORK TRUE
FRAMEWORK_VERSION ${PNGLIB_VERSION}
MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
PUBLIC_HEADER "${libpng_public_hdrs}"
OUTPUT_NAME png)
target_link_libraries(${PNG_LIB_NAME_FRAMEWORK} ${ZLIB_LIBRARY} ${M_LIBRARY})
endif()
if(NOT PNG_LIB_TARGETS)
message(SEND_ERROR
"No library variant selected to build. "
"Please enable at least one of the following options: "
" PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
endif()
if(PNG_SHARED AND WIN32)
set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
endif()
if(PNG_TESTS AND PNG_SHARED)
# does not work with msvc due to png_lib_ver issue
add_executable(pngtest ${pngtest_sources})
target_link_libraries(pngtest ${PNG_LIB_NAME})
add_test(pngtest ./pngtest ${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png)
#
add_executable(pngvalid ${pngvalid_sources})
target_link_libraries(pngvalid ${PNG_LIB_NAME})
add_test(pngvalid ./pngvalid)
add_executable(pngstest ${pngstest_sources})
target_link_libraries(pngstest ${PNG_LIB_NAME})
add_test(pngstest ./pngstest
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g01.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g02.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g04.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn0g16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn2c08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn2c16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p01.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p02.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p04.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn4a08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn4a16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn6a08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/basn6a16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g01.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g02.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn0g04.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn2c16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbbn3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbgn2c16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbgn3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbrn2c08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbwn0g16.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbwn3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftbyn3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n0g08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n2c08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp0n3p08.png
${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/ftp1n3p08.png
)
endif()
# Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set
IF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY "lib")
ENDIF(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
# Set a variable with CMake code which:
# Creates a symlink from src to dest (if possible) or alternatively
# copies if different.
macro(CREATE_SYMLINK SRC_FILE DEST_FILE)
FILE(REMOVE ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
if(WIN32 AND NOT CYGWIN AND NOT MSYS)
ADD_CUSTOM_COMMAND(
OUTPUT ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${SRC_FILE}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE}
COMMAND ${CMAKE_COMMAND} -E copy_if_different "${SRC_FILE}" ${CMAKE_CURRENT_BINARY_DIR}/${DEST_FILE}
DEPENDS ${PNG_LIB_TARGETS}
)
ADD_CUSTOM_TARGET(${DEST_FILE}_COPY ALL DEPENDS ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE})
else(WIN32 AND NOT CYGWIN AND NOT MSYS)
get_filename_component(LINK_TARGET "${SRC_FILE}" NAME)
execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_LIBRARY_OUTPUT_DIRECTORY})
execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${LINK_TARGET}" ${DEST_FILE} WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
endif(WIN32 AND NOT CYGWIN AND NOT MSYS)
endmacro()
# libpng is a library so default to 'lib'
if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
set(CMAKE_INSTALL_LIBDIR lib)
endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
# CREATE PKGCONFIG FILES
# we use the same files like ./configure, so we have to set its vars
# Only do this on Windows for Cygwin - the files don't make much sense outside
# a UNIX look alike
if(NOT WIN32 OR CYGWIN OR MINGW)
set(prefix ${CMAKE_INSTALL_PREFIX})
set(exec_prefix ${CMAKE_INSTALL_PREFIX})
set(libdir ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})
set(includedir ${CMAKE_INSTALL_PREFIX}/include)
set(LIBS "-lz -lm")
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
CREATE_SYMLINK(${PNGLIB_NAME}.pc libpng.pc)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
CREATE_SYMLINK(${PNGLIB_NAME}-config libpng-config)
endif(NOT WIN32 OR CYGWIN OR MINGW)
# SET UP LINKS
if(PNG_SHARED)
set_target_properties(${PNG_LIB_NAME} PROPERTIES
# VERSION 16.${PNGLIB_RELEASE}.1.6.17
VERSION 16.${PNGLIB_RELEASE}.0
SOVERSION 16
CLEAN_DIRECT_OUTPUT 1)
endif()
if(PNG_STATIC)
# MSVC doesn't use a different file extension for shared vs. static
# libs. We are able to change OUTPUT_NAME to remove the _static
# for all other platforms.
if(NOT MSVC)
set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES
OUTPUT_NAME ${PNG_LIB_NAME}
CLEAN_DIRECT_OUTPUT 1)
endif()
endif()
# If CMake > 2.4.x, we set a variable used below to export
# targets to an export file.
# TODO: Use VERSION_GREATER after our cmake_minimum_required >= 2.6.2
if(CMAKE_MAJOR_VERSION GREATER 1 AND CMAKE_MINOR_VERSION GREATER 4)
set(PNG_EXPORT_RULE EXPORT libpng)
elseif(CMAKE_MAJOR_VERSION GREATER 2) # future proof
set(PNG_EXPORT_RULE EXPORT libpng)
endif()
# INSTALL
if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
install(TARGETS ${PNG_LIB_TARGETS}
${PNG_EXPORT_RULE}
RUNTIME DESTINATION bin
LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
if(PNG_SHARED)
# Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
if(CYGWIN OR MINGW)
get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_IMPORT_LIBRARY_SUFFIX})
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif(CYGWIN OR MINGW)
if(NOT WIN32)
get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME} LOCATION_${CMAKE_BUILD_TYPE})
CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_SHARED_LIBRARY_SUFFIX})
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif(NOT WIN32)
endif(PNG_SHARED)
if(PNG_STATIC)
if(NOT WIN32 OR CYGWIN OR MINGW)
get_target_property(BUILD_TARGET_LOCATION ${PNG_LIB_NAME_STATIC} LOCATION_${CMAKE_BUILD_TYPE})
CREATE_SYMLINK(${BUILD_TARGET_LOCATION} libpng${CMAKE_STATIC_LIBRARY_SUFFIX})
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif(NOT WIN32 OR CYGWIN OR MINGW)
endif()
endif()
if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
install(FILES ${libpng_public_hdrs} DESTINATION include)
install(FILES ${libpng_public_hdrs} DESTINATION include/${PNGLIB_NAME})
endif()
if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
if(NOT WIN32 OR CYGWIN OR MINGW)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
DESTINATION bin)
endif(NOT WIN32 OR CYGWIN OR MINGW)
endif()
if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
# Install man pages
if(NOT PNG_MAN_DIR)
set(PNG_MAN_DIR "share/man")
endif()
install(FILES libpng.3 libpngpf.3 DESTINATION ${PNG_MAN_DIR}/man3)
install(FILES png.5 DESTINATION ${PNG_MAN_DIR}/man5)
# Install pkg-config files
if(NOT WIN32 OR CYGWIN OR MINGW)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
DESTINATION bin)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
DESTINATION bin)
endif(NOT WIN32 OR CYGWIN OR MINGW)
endif()
# On versions of CMake that support it, create an export file CMake
# users can include() to import our targets
if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
endif()
# what's with libpng-manual.txt and all the extra files?
# UNINSTALL
# do we need this?
# DIST
# do we need this?
# to create msvc import lib for mingw compiled shared lib
# pexports libpng.dll > libpng.def
# lib /def:libpng.def /machine:x86

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Installing libpng
Contents
I. Simple installation
II. Rebuilding the configure scripts
III. Using scripts/makefile*
IV. Using cmake
V. Directory structure
VI. Building with project files
VII. Building with makefiles
VIII. Configuring libpng for 16-bit platforms
IX. Configuring for DOS
X. Configuring for Medium Model
XI. Prepending a prefix to exported symbols
XII. Configuring for compiler xxx:
XIII. Removing unwanted object code
XIV. Changes to the build and configuration of libpng in libpng-1.5.x
XV. Setjmp/longjmp issues
XVI. Other sources of information about libpng
I. Simple installation
On Unix/Linux and similar systems, you can simply type
./configure [--prefix=/path]
make check
make install
and ignore the rest of this document. "/path" is the path to the directory
where you want to install the libpng "lib", "include", and "bin"
subdirectories.
If you downloaded a GIT clone, you will need to run ./autogen.sh before
running ./configure, to create "configure" and "Makefile.in" which are
not included in the GIT repository.
Note that "configure" is only included in the "*.tar" distributions and not
in the "*.zip" or "*.7z" distributions. If you downloaded one of those
distributions, see "Building with project files" or "Building with makefiles",
below.
II. Rebuilding the configure scripts
If configure does not work on your system, or if you have a need to
change configure.ac or Makefile.am, and you have a reasonably
up-to-date set of tools, running ./autogen.sh in a git clone before
running ./configure may fix the problem. To be really sure that you
aren't using any of the included pre-built scripts, you can do this:
./configure --enable-maintainer-mode
make maintainer-clean
./autogen.sh --maintainer --clean
./autogen.sh --maintainer
./configure [--prefix=/path] [other options]
make
make install
make check
III. Using scripts/makefile*
Instead, you can use one of the custom-built makefiles in the
"scripts" directory
cp scripts/pnglibconf.h.prebuilt pnglibconf.h
cp scripts/makefile.system makefile
make test
make install
The files that are presently available in the scripts directory
are listed and described in scripts/README.txt.
Or you can use one of the "projects" in the "projects" directory.
Before installing libpng, you must first install zlib, if it
is not already on your system. zlib can usually be found
wherever you got libpng; otherwise go to http://zlib.net. You can place
zlib in in the same directory as libpng or in another directory.
If your system already has a preinstalled zlib you will still need
to have access to the zlib.h and zconf.h include files that
correspond to the version of zlib that's installed.
If you wish to test with a particular zlib that is not first in the
standard library search path, put ZLIBLIB, ZLIBINC, CPPFLAGS, LDFLAGS,
and LD_LIBRARY_PATH in your environment before running "make test"
or "make distcheck":
ZLIBLIB=/path/to/lib export ZLIBLIB
ZLIBINC=/path/to/include export ZLIBINC
CPPFLAGS="-I$ZLIBINC" export CPPFLAGS
LDFLAGS="-L$ZLIBLIB" export LDFLAGS
LD_LIBRARY_PATH="$ZLIBLIB:$LD_LIBRARY_PATH" export LD_LIBRARY_PATH
If you are using one of the makefile scripts, put ZLIBLIB and ZLIBINC
in your environment and type "make ZLIBLIB=$ZLIBLIB ZLIBINC=$ZLIBINC test".
IV. Using cmake
If you want to use "cmake" (see www.cmake.org), type
cmake . -DCMAKE_INSTALL_PREFIX=/path
make
make install
As when using the simple configure method described above, "/path" points to
the installation directory where you want to put the libpng "lib", "include",
and "bin" subdirectories.
V. Directory structure
You can rename the directories that you downloaded (they
might be called "libpng-x.y.z" or "libpngNN" and "zlib-1.2.8"
or "zlib128") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
.. (the parent directory)
libpng (this directory)
INSTALL (this file)
README
*.h, *.c => libpng source files
CMakeLists.txt => "cmake" script
configuration files:
configure.ac, configure, Makefile.am, Makefile.in,
autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
libpng-config.in, aclocal.m4, config.h.in, config.sub,
depcomp, install-sh, mkinstalldirs, test-pngtest.sh
contrib
arm-neon, conftest, examples, gregbook, libtests, pngminim,
pngminus, pngsuite, tools, visupng
projects
cbuilder5, owatcom, visualc71, vstudio, xcode
scripts
makefile.*
*.def (module definition files)
etc.
pngtest.png
etc.
zlib
README, *.h, *.c contrib, etc.
If the line endings in the files look funny, you may wish to get the other
distribution of libpng. It is available in both tar.gz (UNIX style line
endings) and zip (DOS style line endings) formats.
VI. Building with project files
If you are building libpng with MSVC, you can enter the
libpng projects\visualc71 or vstudio directory and follow the instructions
in README.txt.
Otherwise enter the zlib directory and follow the instructions in zlib/README,
then come back here and run "configure" or choose the appropriate
makefile.sys in the scripts directory.
VII. Building with makefiles
Copy the file (or files) that you need from the
scripts directory into this directory, for example
MSDOS example: copy scripts\makefile.msc makefile
copy scripts\pnglibconf.h.prebuilt pnglibconf.h
UNIX example: cp scripts/makefile.std makefile
cp scripts/pnglibconf.h.prebuilt pnglibconf.h
Read the makefile to see if you need to change any source or
target directories to match your preferences.
Then read pnglibconf.dfa to see if you want to make any configuration
changes.
Then just run "make" which will create the libpng library in
this directory and "make test" which will run a quick test that reads
the "pngtest.png" file and writes a "pngout.png" file that should be
identical to it. Look for "9782 zero samples" in the output of the
test. For more confidence, you can run another test by typing
"pngtest pngnow.png" and looking for "289 zero samples" in the output.
Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
your output with the result shown in contrib/pngsuite/README.
Most of the makefiles will allow you to run "make install" to
put the library in its final resting place (if you want to
do that, run "make install" in the zlib directory first if necessary).
Some also allow you to run "make test-installed" after you have
run "make install".
VIII. Configuring libpng for 16-bit platforms
You will want to look into zconf.h to tell zlib (and thus libpng) that
it cannot allocate more than 64K at a time. Even if you can, the memory
won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
IX. Configuring for DOS
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
X. Configuring for Medium Model
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
defined, and FAR gets defined to far in pngconf.h, and you should be
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
note that the rows of data are defined as png_bytepp, which is
an "unsigned char far * far *".
XI. Prepending a prefix to exported symbols
Starting with libpng-1.6.0, you can configure libpng (when using the
"configure" script) to prefix all exported symbols by means of the
configuration option "--with-libpng-prefix=FOO_", where FOO_ can be any
string beginning with a letter and containing only uppercase
and lowercase letters, digits, and the underscore (i.e., a C language
identifier). This creates a set of macros in pnglibconf.h, so this is
transparent to applications; their function calls get transformed by
the macros to use the modified names.
XII. Configuring for compiler xxx:
All includes for libpng are in pngconf.h. If you need to add, change
or delete an include, this is the place to do it.
The includes that are not needed outside libpng are placed in pngpriv.h,
which is only used by the routines inside libpng itself.
The files in libpng proper only include pngpriv.h and png.h, which
in turn includes pngconf.h and, as of libpng-1.5.0, pnglibconf.h.
As of libpng-1.5.0, pngpriv.h also includes three other private header
files, pngstruct.h, pnginfo.h, and pngdebug.h, which contain material
that previously appeared in the public headers.
XIII. Removing unwanted object code
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
never going to use a capability, you can change the #define to #undef
before recompiling libpng and save yourself code and data space, or
you can turn off individual capabilities with defines that begin with
PNG_NO_.
In libpng-1.5.0 and later, the #define's are in pnglibconf.h instead.
You can also turn all of the transforms and ancillary chunk capabilities
off en masse with compiler directives that define
PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
or all four, along with directives to turn on any of the capabilities that
you do want. The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable the
extra transformations but still leave the library fully capable of reading
and writing PNG files with all known public chunks. Use of the
PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive produces a library
that is incapable of reading or writing ancillary chunks. If you are
not using the progressive reading capability, you can turn that off
with PNG_NO_PROGRESSIVE_READ (don't confuse this with the INTERLACING
capability, which you'll still have).
All the reading and writing specific code are in separate files, so the
linker should only grab the files it needs. However, if you want to
make sure, or if you are building a stand alone library, all the
reading files start with "pngr" and all the writing files start with "pngw".
The files that don't match either (like png.c, pngtrans.c, etc.)
are used for both reading and writing, and always need to be included.
The progressive reader is in pngpread.c
If you are creating or distributing a dynamically linked library (a .so
or DLL file), you should not remove or disable any parts of the library,
as this will cause applications linked with different versions of the
library to fail if they call functions not available in your library.
The size of the library itself should not be an issue, because only
those sections that are actually used will be loaded into memory.
XIV. Changes to the build and configuration of libpng in libpng-1.5.x
Details of internal changes to the library code can be found in the CHANGES
file and in the GIT repository logs. These will be of no concern to the vast
majority of library users or builders; however, the few who configure libpng
to a non-default feature set may need to change how this is done.
There should be no need for library builders to alter build scripts if
these use the distributed build support - configure or the makefiles -
however, users of the makefiles may care to update their build scripts
to build pnglibconf.h where the corresponding makefile does not do so.
Building libpng with a non-default configuration has changed completely.
The old method using pngusr.h should still work correctly even though the
way pngusr.h is used in the build has been changed; however, library
builders will probably want to examine the changes to take advantage of
new capabilities and to simplify their build system.
A. Specific changes to library configuration capabilities
The exact mechanism used to control attributes of API functions has
changed. A single set of operating system independent macro definitions
is used and operating system specific directives are defined in
pnglibconf.h
As part of this the mechanism used to choose procedure call standards on
those systems that allow a choice has been changed. At present this only
affects certain Microsoft (DOS, Windows) and IBM (OS/2) operating systems
running on Intel processors. As before, PNGAPI is defined where required
to control the exported API functions; however, two new macros, PNGCBAPI
and PNGCAPI, are used instead for callback functions (PNGCBAPI) and
(PNGCAPI) for functions that must match a C library prototype (currently
only png_longjmp_ptr, which must match the C longjmp function.) The new
approach is documented in pngconf.h
Despite these changes, libpng 1.5.0 only supports the native C function
calling standard on those platforms tested so far (__cdecl on Microsoft
Windows). This is because the support requirements for alternative
calling conventions seem to no longer exist. Developers who find it
necessary to set PNG_API_RULE to 1 should advise the mailing list
(png-mng-implement) of this and library builders who use Openwatcom and
therefore set PNG_API_RULE to 2 should also contact the mailing list.
B. Changes to the configuration mechanism
Prior to libpng-1.5.0 library builders who needed to configure libpng
had either to modify the exported pngconf.h header file to add system
specific configuration or had to write feature selection macros into
pngusr.h and cause this to be included into pngconf.h by defining
PNG_USER_CONFIG. The latter mechanism had the disadvantage that an
application built without PNG_USER_CONFIG defined would see the
unmodified, default, libpng API and thus would probably fail to link.
These mechanisms still work in the configure build and in any makefile
build that builds pnglibconf.h, although the feature selection macros
have changed somewhat as described above. In 1.5.0, however, pngusr.h is
processed only once, at the time the exported header file pnglibconf.h is
built. pngconf.h no longer includes pngusr.h; therefore, pngusr.h is ignored
after the build of pnglibconf.h and it is never included in an application
build.
The formerly used alternative of adding a list of feature macros to the
CPPFLAGS setting in the build also still works; however, the macros will be
copied to pnglibconf.h and this may produce macro redefinition warnings
when the individual C files are compiled.
All configuration now only works if pnglibconf.h is built from
scripts/pnglibconf.dfa. This requires the program awk. Brian Kernighan
(the original author of awk) maintains C source code of that awk and this
and all known later implementations (often called by subtly different
names - nawk and gawk for example) are adequate to build pnglibconf.h.
The Sun Microsystems (now Oracle) program 'awk' is an earlier version
and does not work; this may also apply to other systems that have a
functioning awk called 'nawk'.
Configuration options are now documented in scripts/pnglibconf.dfa. This
file also includes dependency information that ensures a configuration is
consistent; that is, if a feature is switched off, dependent features are
also switched off. As a recommended alternative to using feature macros in
pngusr.h a system builder may also define equivalent options in pngusr.dfa
(or, indeed, any file) and add that to the configuration by setting
DFA_XTRA to the file name. The makefiles in contrib/pngminim illustrate
how to do this, and also illustrate a case where pngusr.h is still required.
After you have built libpng, the definitions that were recorded in
pnglibconf.h are available to your application (pnglibconf.h is included
in png.h and gets installed alongside png.h and pngconf.h in your
$PREFIX/include directory). Do not edit pnglibconf.h after you have built
libpng, because than the settings would not accurately reflect the settings
that were used to build libpng.
XV. Setjmp/longjmp issues
Libpng uses setjmp()/longjmp() for error handling. Unfortunately setjmp()
is known to be not thread-safe on some platforms and we don't know of
any platform where it is guaranteed to be thread-safe. Therefore, if
your application is going to be using multiple threads, you should
configure libpng with PNG_NO_SETJMP in your pngusr.dfa file, with
-DPNG_NO_SETJMP on your compile line, or with
#undef PNG_SETJMP_SUPPORTED
in your pnglibconf.h or pngusr.h.
Starting with libpng-1.6.0, the library included a "simplified API".
This requires setjmp/longjmp, so you must either build the library
with PNG_SETJMP_SUPPORTED defined, or with PNG_SIMPLIFIED_READ_SUPPORTED
and PNG_SIMPLIFIED_WRITE_SUPPORTED undefined.
XVI. Other sources of information about libpng:
Further information can be found in the README and libpng-manual.txt
files, in the individual makefiles, in png.h, and the manual pages
libpng.3 and png.5.
Using the ./configure script -- 16 December 2002.
=================================================
The ./configure script should work compatibly with what scripts/makefile.*
did, however there are some options you might need to add to configure
explicitly, which previously was done semi-automatically (if you didn't edit
scripts/makefile.* yourself, that is)
CFLAGS="-Wall -O -funroll-loops \
-malign-loops=2 -malign-functions=2" ./configure --prefix=/usr/include \
--with-pkgconfigdir=/usr/lib/pkgconfig --includedir=/usr/include
You can alternatively specify --includedir=/usr/include, /usr/local/include,
/usr/include/libpng16, or whatever.
If you find that the configure script is out-of-date or is not supporting
your platform properly, try running autogen.sh to regenerate "configure",
"Makefile.in", and the other configuration files. Then try configure again.

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This copy of the libpng notices is provided for your convenience. In case of
any discrepancy between this copy and the notices in the file png.h that is
included in the libpng distribution, the latter shall prevail.
COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
If you modify libpng you may insert additional notices immediately following
this sentence.
This code is released under the libpng license.
libpng versions 1.2.6, August 15, 2004, through 1.6.17, March 26, 2015, are
Copyright (c) 2004, 2006-2015 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.2.5
with the following individual added to the list of Contributing Authors
Cosmin Truta
libpng versions 1.0.7, July 1, 2000, through 1.2.5 - October 3, 2002, are
Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-1.0.6
with the following individuals added to the list of Contributing Authors
Simon-Pierre Cadieux
Eric S. Raymond
Gilles Vollant
and with the following additions to the disclaimer:
There is no warranty against interference with your enjoyment of the
library or against infringement. There is no warranty that our
efforts or the library will fulfill any of your particular purposes
or needs. This library is provided with all faults, and the entire
risk of satisfactory quality, performance, accuracy, and effort is with
the user.
libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
Copyright (c) 1998, 1999 Glenn Randers-Pehrson, and are
distributed according to the same disclaimer and license as libpng-0.96,
with the following individuals added to the list of Contributing Authors:
Tom Lane
Glenn Randers-Pehrson
Willem van Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997, are
Copyright (c) 1996, 1997 Andreas Dilger
Distributed according to the same disclaimer and license as libpng-0.88,
with the following individuals added to the list of Contributing Authors:
John Bowler
Kevin Bracey
Sam Bushell
Magnus Holmgren
Greg Roelofs
Tom Tanner
libpng versions 0.5, May 1995, through 0.88, January 1996, are
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
For the purposes of this copyright and license, "Contributing Authors"
is defined as the following set of individuals:
Andreas Dilger
Dave Martindale
Guy Eric Schalnat
Paul Schmidt
Tim Wegner
The PNG Reference Library is supplied "AS IS". The Contributing Authors
and Group 42, Inc. disclaim all warranties, expressed or implied,
including, without limitation, the warranties of merchantability and of
fitness for any purpose. The Contributing Authors and Group 42, Inc.
assume no liability for direct, indirect, incidental, special, exemplary,
or consequential damages, which may result from the use of the PNG
Reference Library, even if advised of the possibility of such damage.
Permission is hereby granted to use, copy, modify, and distribute this
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:
1. The origin of this source code must not be misrepresented.
2. Altered versions must be plainly marked as such and must not
be misrepresented as being the original source.
3. This Copyright notice may not be removed or altered from any
source or altered source distribution.
The Contributing Authors and Group 42, Inc. specifically permit, without
fee, and encourage the use of this source code as a component to
supporting the PNG file format in commercial products. If you use this
source code in a product, acknowledgment is not required but would be
appreciated.
A "png_get_copyright" function is available, for convenient use in "about"
boxes and the like:
printf("%s",png_get_copyright(NULL));
Also, the PNG logo (in PNG format, of course) is supplied in the
files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
Libpng is OSI Certified Open Source Software. OSI Certified Open Source is a
certification mark of the Open Source Initiative.
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
March 26, 2015

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# Makefile.am:
# Source file for Makefile.in (and hence Makefile)
#
PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
ACLOCAL_AMFLAGS = -I scripts
# test programs - run on make check, make distcheck
check_PROGRAMS= pngtest pngunknown pngstest pngvalid pngimage
# Utilities - installed
bin_PROGRAMS= pngfix png-fix-itxt
# This ensures that pnglibconf.h gets built at the start of 'make all' or
# 'make check', but it does not add dependencies to the individual programs,
# this is done below.
#
# IMPORTANT: always add the object modules of new programs to the list below
# because otherwise the sequence 'configure; make new-program' will *sometimes*
# result in the installed (system) pnglibconf.h being used and the result is
# always wrong and always very confusing.
BUILT_SOURCES = pnglibconf.h
pngtest_SOURCES = pngtest.c
pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
pngvalid_SOURCES = contrib/libtests/pngvalid.c
pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
pngstest_SOURCES = contrib/libtests/pngstest.c
pngstest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
pngunknown_SOURCES = contrib/libtests/pngunknown.c
pngunknown_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
pngimage_SOURCES = contrib/libtests/pngimage.c
pngimage_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
pngfix_SOURCES = contrib/tools/pngfix.c
pngfix_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
png_fix_itxt_SOURCES = contrib/tools/png-fix-itxt.c
# Generally these are single line shell scripts to run a test with a particular
# set of parameters:
TESTS =\
tests/pngtest\
tests/pngvalid-gamma-16-to-8 tests/pngvalid-gamma-alpha-mode\
tests/pngvalid-gamma-background tests/pngvalid-gamma-expand16-alpha-mode\
tests/pngvalid-gamma-expand16-background\
tests/pngvalid-gamma-expand16-transform tests/pngvalid-gamma-sbit\
tests/pngvalid-gamma-threshold tests/pngvalid-gamma-transform\
tests/pngvalid-progressive-interlace-size\
tests/pngvalid-progressive-interlace-standard\
tests/pngvalid-progressive-interlace-transform\
tests/pngvalid-progressive-standard tests/pngvalid-standard\
tests/pngstest-0g01 tests/pngstest-0g02 tests/pngstest-0g04\
tests/pngstest-0g08 tests/pngstest-0g16 tests/pngstest-2c08\
tests/pngstest-2c16 tests/pngstest-3p01 tests/pngstest-3p02\
tests/pngstest-3p04 tests/pngstest-3p08 tests/pngstest-4a08\
tests/pngstest-4a16 tests/pngstest-6a08 tests/pngstest-6a16\
tests/pngstest-error tests/pngunknown-IDAT\
tests/pngunknown-discard tests/pngunknown-if-safe tests/pngunknown-sAPI\
tests/pngunknown-sTER tests/pngunknown-save tests/pngunknown-vpAg\
tests/pngimage-quick tests/pngimage-full
# These tests are expected, and required, to fail:
XFAIL_TESTS = tests/pngstest-error
# man pages
dist_man_MANS= libpng.3 libpngpf.3 png.5
# generate the -config scripts if required
binconfigs= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
EXTRA_SCRIPTS= libpng-config libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config
bin_SCRIPTS= @binconfigs@
# rules to build libpng, only build the old library on request
lib_LTLIBRARIES=libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
# EXTRA_LTLIBRARIES= libpng.la
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
if PNG_ARM_NEON
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
arm/filter_neon.S arm/filter_neon_intrinsics.c
endif
nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined -export-dynamic \
-version-number @PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0
if HAVE_LD_VERSION_SCRIPT
# Versioned symbols and restricted exports
if HAVE_SOLARIS_LD
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,-M -Wl,libpng.vers
else
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -Wl,--version-script=libpng.vers
endif
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.vers
else
# Only restricted exports when possible
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS += -export-symbols libpng.sym
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
endif
#distribute headers in /usr/include/libpng/*
pkgincludedir= $(includedir)/$(PNGLIB_BASENAME)
pkginclude_HEADERS= png.h pngconf.h
nodist_pkginclude_HEADERS= pnglibconf.h
# pkg-config stuff, note that libpng.pc is always required in order
# to get the correct library
pkgconfigdir = @pkgconfigdir@
pkgconfig_DATA = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc
# Extra source distribution files, '${srcdir}' is used below to stop build files
# from those directories being included. This only works if the configure is
# not done in the source directory!
EXTRA_DIST= \
ANNOUNCE CHANGES INSTALL LICENSE README TODO \
pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
$(TESTS) $(XFAIL_TESTS) tests/pngstest \
CMakeLists.txt example.c libpng-manual.txt
SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk
CLEANFILES= *.tf? pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
check.new pnglibconf.h pngprefix.h symbols.new pngtest-log.txt \
pnglibconf.out pnglibconf.c pnglibconf.pre pnglibconf.dfn \
$(SCRIPT_CLEANFILES)
MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
config.sub configure depcomp install-sh ltmain.sh missing
# PNG_COPTS give extra options for the C compiler to be used on all compilation
# steps (unless targe_CFLAGS is specified; that will take precedence over
# AM_CFLAGS)
PNG_COPTS = @PNG_COPTS@
AM_CFLAGS = ${PNG_COPTS}
# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
# other operating systems (NeXT?) the C preprocessor selected by configure
# checks input tokens for validity - effectively it performs part of the ANSI-C
# parsing - and therefore fails with the .df files. configure.ac has special
# checks for this and sets DFNCPP appropriately.
DFNCPP = @DFNCPP@
SUFFIXES = .chk .out
$(PNGLIB_BASENAME).pc: libpng.pc
cp libpng.pc $@
$(PNGLIB_BASENAME)-config: libpng-config
cp libpng-config $@
scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h
scripts/prefix.out: png.h pngconf.h pnglibconf.out
scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt
scripts/intprefix.out: pnglibconf.h
libpng.sym: scripts/sym.out
rm -f $@
cp $? $@
libpng.vers: scripts/vers.out
rm -f $@
cp $? $@
if DO_PNG_PREFIX
# Rename functions in scripts/prefix.out with a PNG_PREFIX prefix.
# Rename macros in scripts/macro.lst from PNG_PREFIXpng_ to PNG_ (the actual
# implementation of the macro).
pnglibconf.h: pnglibconf.out scripts/prefix.out scripts/macro.lst
rm -f $@
$(AWK) 's==0 && NR>1{print prev}\
s==0{prev=$$0}\
s==1{print "#define", $$1, "@PNG_PREFIX@" $$1}\
s==2{print "#define @PNG_PREFIX@png_" $$1, "PNG_" $$1}\
END{print prev}' s=0 pnglibconf.out s=1 scripts/prefix.out\
s=2 ${srcdir}/scripts/macro.lst >pnglibconf.tf8
mv pnglibconf.tf8 $@
pngprefix.h: scripts/intprefix.out
rm -f pngprefix.tf1
$(AWK) '{print "#define", $$1, "@PNG_PREFIX@" $$1}' $? >pngprefix.tf1
mv pngprefix.tf1 $@
else
pnglibconf.h: pnglibconf.out
rm -f $@
cp $? $@
pngprefix.h: # is empty
:>$@
endif
$(srcdir)/scripts/pnglibconf.h.prebuilt:
@echo "Attempting to build $@" >&2
@echo "This is a machine generated file, but if you want to make" >&2
@echo "a new one simply make 'scripts/pnglibconf.out', copy that" >&2
@echo "AND set PNG_ZLIB_VERNUM to 0 (you MUST do this)" >&2
@exit 1
# The following is necessary to ensure that the local pnglibconf.h is used, not
# an installed one (this can happen immediately after on a clean system if
# 'make test' is the first thing the user does.) Only files which include
# one of the png source files (typically png.h or pngpriv.h) need to be listed
# here:
pngtest.o: pnglibconf.h
contrib/libtests/makepng.o: pnglibconf.h
contrib/libtests/pngstest.o: pnglibconf.h
contrib/libtests/pngunknown.o: pnglibconf.h
contrib/libtests/pngimage.o: pnglibconf.h
contrib/libtests/pngvalid.o: pnglibconf.h
contrib/libtests/readpng.o: pnglibconf.h
contrib/libtests/tarith.o: pnglibconf.h
contrib/libtests/timepng.o: pnglibconf.h
contrib/tools/makesRGB.o: pnglibconf.h
contrib/tools/pngfix.o: pnglibconf.h
# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
# be built with PNG_USE_READ_MACROS; this prevents the read macros from
# interfering with the symbol file format.
SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
-DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE
if DO_PNG_PREFIX
SYMBOL_CFLAGS += -DPNG_PREFIX='@PNG_PREFIX@'
endif
.c.out:
rm -f $@ $*.tf[12]
test -d scripts || mkdir scripts || test -d scripts
$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES)\
$(CPPFLAGS) $(SYMBOL_CFLAGS) $< > $*.tf1
$(AWK) -f "${srcdir}/scripts/dfn.awk" out="$*.tf2" $*.tf1 1>&2
rm -f $*.tf1
mv $*.tf2 $@
# The .c file for pnglibconf.h is machine generated
pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA)
rm -f $@ $*.tf[45]
$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf4 version=search\
${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
${srcdir}/pngusr.dfa $(DFA_XTRA) 1>&2
$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf5 $*.tf4 1>&2
rm $*.tf4
mv $*.tf5 $@
# Symbol checks (.def and .out files should match)
scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out
.out.chk:
rm -f $@ $*.new
$(AWK) -f ${srcdir}/scripts/checksym.awk ${srcdir}/scripts/${*F}.def\
of="$*.new" $< >&2
mv $*.new $@
# used on demand to regenerate the standard header, CPPFLAGS should
# be empty - no non-standard defines
scripts/pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
rm -f $@ pnglibconf.tf[67]
test -z "$(CPPFLAGS)"
echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
$(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf6\
logunsupported=1 version=search ${srcdir}/pngconf.h -\
${srcdir}/scripts/pnglibconf.dfa 1>&2
$(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf7\
pnglibconf.tf6 1>&2
rm pnglibconf.tf6
mv pnglibconf.tf7 $@
$(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h pngprefix.h
test: check-am
# Extra checks
check: scripts/symbols.chk
# Don't distribute the generated script files
dist-hook:
cd '$(top_distdir)'; rm -f $(SCRIPT_CLEANFILES)
# Make links between installed files with release-specific names and the generic
# file names. If this install rule is run the generic names will be deleted and
# recreated - this has obvious issues for systems with multiple installations.
install-header-links:
@set -ex; cd '$(DESTDIR)$(includedir)'; for f in $(HEADERS); do \
rm -f "$$f"; $(LN_S) "$(PNGLIB_BASENAME)/$$f" "$$f"; done
uninstall-header-links:
cd '$(DESTDIR)$(includedir)'; rm -f $(HEADERS)
install-libpng-pc:
@set -ex; cd '$(DESTDIR)$(pkgconfigdir)'; rm -f libpng.pc; \
$(LN_S) '$(PNGLIB_BASENAME).pc' libpng.pc
uninstall-libpng-pc:
rm -f '$(DESTDIR)$(pkgconfigdir)/libpng.pc'
# EXT_LIST is a list of the possibly library directory extensions, this exists
# because we can't find a good way of discovering the file extensions that are
# actually installed on a given system, so instead we check for every extension
# we have seen.
EXT_LIST = a dll.a so so.@PNGLIB_MAJOR@@PNGLIB_MINOR@.@PNGLIB_RELEASE@ la sl dylib
install-library-links:
@set -x; cd '$(DESTDIR)$(libdir)';\
for ext in $(EXT_LIST); do\
rm -f "libpng.$$ext";\
if test -f "$(PNGLIB_BASENAME).$$ext"; then\
$(LN_S) "$(PNGLIB_BASENAME).$$ext" "libpng.$$ext" || exit 1;\
fi;\
done
uninstall-library-links:
@set -x; cd '$(DESTDIR)$(libdir)'; for ext in $(EXT_LIST); do\
rm -f "libpng.$$ext"; done
install-libpng-config:
@set -ex; cd '$(DESTDIR)$(bindir)'; rm -f libpng-config; \
$(LN_S) '$(PNGLIB_BASENAME)-config' libpng-config
uninstall-libpng-config:
rm -f '$(DESTDIR)$(bindir)/libpng-config'
if DO_INSTALL_LINKS
# If --enable-unversioned-links is specified the header and lib file links
# will be automatically made on a 'make install':
install-data-hook: install-header-links
uninstall-hook: uninstall-header-links
install-exec-hook: install-library-links
uninstall-hook: uninstall-library-links
endif
if DO_INSTALL_LIBPNG_PC
# Likewise, --install-pc causes libpng.pc to be constructed:
install-data-hook: install-libpng-pc
uninstall-hook: uninstall-libpng-pc
endif
if DO_INSTALL_LIBPNG_CONFIG
# And --install-config:
install-exec-hook: install-libpng-config
uninstall-hook: uninstall-libpng-config
endif
# The following addition ensures that 'make all' always builds the test programs
# too. It used to, but some change either in libpng or configure stopped this
# working.
all-am: $(check_PROGRAMS)

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README for libpng version 1.6.17 - March 26, 2015 (shared library 16.0)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
Libpng comes in several distribution formats. Get libpng-*.tar.gz or
libpng-*.tar.xz or if you want UNIX-style line endings in the text files,
or lpng*.7z or lpng*.zip if you want DOS-style line endings.
Version 0.89 was the first official release of libpng. Don't let the
fact that it's the first release fool you. The libpng library has been in
extensive use and testing since mid-1995. By late 1997 it had
finally gotten to the stage where there hadn't been significant
changes to the API in some time, and people have a bad feeling about
libraries with versions < 1.0. Version 1.0.0 was released in
March 1998.
****
Note that some of the changes to the png_info structure render this
version of the library binary incompatible with libpng-0.89 or
earlier versions if you are using a shared library. The type of the
"filler" parameter for png_set_filler() has changed from png_byte to
png_uint_32, which will affect shared-library applications that use
this function.
To avoid problems with changes to the internals of png info_struct,
new APIs have been made available in 0.95 to avoid direct application
access to info_ptr. These functions are the png_set_<chunk> and
png_get_<chunk> functions. These functions should be used when
accessing/storing the info_struct data, rather than manipulating it
directly, to avoid such problems in the future.
It is important to note that the APIs did not make current programs
that access the info struct directly incompatible with the new
library, through libpng-1.2.x. In libpng-1.4.x, which was meant to
be a transitional release, members of the png_struct and the
info_struct can still be accessed, but the compiler will issue a
warning about deprecated usage. Since libpng-1.5.0, direct access
to these structs is not allowed, and the definitions of the structs
reside in private pngstruct.h and pnginfo.h header files that are not
accessible to applications. It is strongly suggested that new
programs use the new APIs (as shown in example.c and pngtest.c), and
older programs be converted to the new format, to facilitate upgrades
in the future.
****
Additions since 0.90 include the ability to compile libpng as a
Windows DLL, and new APIs for accessing data in the info struct.
Experimental functions include the ability to set weighting and cost
factors for row filter selection, direct reads of integers from buffers
on big-endian processors that support misaligned data access, faster
methods of doing alpha composition, and more accurate 16->8 bit color
conversion.
The additions since 0.89 include the ability to read from a PNG stream
which has had some (or all) of the signature bytes read by the calling
application. This also allows the reading of embedded PNG streams that
do not have the PNG file signature. As well, it is now possible to set
the library action on the detection of chunk CRC errors. It is possible
to set different actions based on whether the CRC error occurred in a
critical or an ancillary chunk.
The changes made to the library, and bugs fixed are based on discussions
on the PNG-implement mailing list and not on material submitted
privately to Guy, Andreas, or Glenn. They will forward any good
suggestions to the list.
For a detailed description on using libpng, read libpng-manual.txt. For
examples of libpng in a program, see example.c and pngtest.c. For usage
information and restrictions (what little they are) on libpng, see
png.h. For a description on using zlib (the compression library used by
libpng) and zlib's restrictions, see zlib.h
I have included a general makefile, as well as several machine and
compiler specific ones, but you may have to modify one for your own needs.
You should use zlib 1.0.4 or later to run this, but it MAY work with
versions as old as zlib 0.95. Even so, there are bugs in older zlib
versions which can cause the output of invalid compression streams for
some images. You will definitely need zlib 1.0.4 or later if you are
taking advantage of the MS-DOS "far" structure allocation for the small
and medium memory models. You should also note that zlib is a
compression library that is useful for more things than just PNG files.
You can use zlib as a drop-in replacement for fread() and fwrite() if
you are so inclined.
zlib should be available at the same place that libpng is, or at zlib.net.
You may also want a copy of the PNG specification. It is available
as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find
these at http://www.libpng.org/pub/png/documents/
This code is currently being archived at libpng.sf.net in the
[DOWNLOAD] area, and at ftp://ftp.simplesystems.org. If you can't find it
in any of those places, e-mail me, and I'll help you find it.
I am not a lawyer, but I believe that the Export Control Classification
Number (ECCN) for libpng is EAR99, which means not subject to export
controls or International Traffic in Arms Regulations (ITAR) because it
is open source, publicly available software, that does not contain any
encryption software. See the EAR, paragraphs 734.3(b)(3) and 734.7(b).
If you have any code changes, requests, problems, etc., please e-mail
them to me. Also, I'd appreciate any make files or project files,
and any modifications you needed to make to get libpng to compile,
along with a #define variable to tell what compiler/system you are on.
If you needed to add transformations to libpng, or wish libpng would
provide the image in a different way, drop me a note (and code, if
possible), so I can consider supporting the transformation.
Finally, if you get any warning messages when compiling libpng
(note: not zlib), and they are easy to fix, I'd appreciate the
fix. Please mention "libpng" somewhere in the subject line. Thanks.
This release was created and will be supported by myself (of course
based in a large way on Guy's and Andreas' earlier work), and the PNG
development group.
Send comments/corrections/commendations to png-mng-implement at
lists.sourceforge.net (subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement
to subscribe) or to glennrp at users.sourceforge.net
You can't reach Guy, the original libpng author, at the addresses
given in previous versions of this document. He and Andreas will
read mail addressed to the png-implement list, however.
Please do not send general questions about PNG. Send them to
png-mng-misc at lists.sf.net (subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
subscribe). If you have a question about something
in the PNG specification that is related to using libpng, send it
to me. Send me any questions that start with "I was using libpng,
and ...". If in doubt, send questions to me. I'll bounce them
to others, if necessary.
Please do not send suggestions on how to change PNG. We have
been discussing PNG for nineteen years now, and it is official and
finished. If you have suggestions for libpng, however, I'll
gladly listen. Even if your suggestion is not used immediately,
it may be used later.
Files in this distribution:
ANNOUNCE => Announcement of this version, with recent changes
CHANGES => Description of changes between libpng versions
KNOWNBUG => List of known bugs and deficiencies
LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
Y2KINFO => Statement of Y2K compliance
example.c => Example code for using libpng functions
libpng.3 => manual page for libpng (includes libpng-manual.txt)
libpng-manual.txt => Description of libpng and its functions
libpngpf.3 => manual page for libpng's private functions
png.5 => manual page for the PNG format
png.c => Basic interface functions common to library
png.h => Library function and interface declarations (public)
pngpriv.h => Library function and interface declarations (private)
pngconf.h => System specific library configuration (public)
pngstruct.h => png_struct declaration (private)
pnginfo.h => png_info struct declaration (private)
pngdebug.h => debugging macros (private)
pngerror.c => Error/warning message I/O functions
pngget.c => Functions for retrieving info from struct
pngmem.c => Memory handling functions
pngbar.png => PNG logo, 88x31
pngnow.png => PNG logo, 98x31
pngpread.c => Progressive reading functions
pngread.c => Read data/helper high-level functions
pngrio.c => Lowest-level data read I/O functions
pngrtran.c => Read data transformation functions
pngrutil.c => Read data utility functions
pngset.c => Functions for storing data into the info_struct
pngtest.c => Library test program
pngtest.png => Library test sample image
pngtrans.c => Common data transformation functions
pngwio.c => Lowest-level write I/O functions
pngwrite.c => High-level write functions
pngwtran.c => Write data transformations
pngwutil.c => Write utility functions
arm => Contains optimized code for the ARM platform
contrib => Contributions
examples => Example programs
gregbook => source code for PNG reading and writing, from
Greg Roelofs' "PNG: The Definitive Guide",
O'Reilly, 1999
libtests => Test programs
pngminim => Minimal decoder, encoder, and progressive decoder
programs demonstrating use of pngusr.dfa
pngminus => Simple pnm2png and png2pnm programs
pngsuite => Test images
tools => Various tools
visupng => Contains a MSVC workspace for VisualPng
projects => Contains project files and workspaces for
building a DLL
owatcom => Contains a WATCOM project for building libpng
visualc71 => Contains a Microsoft Visual C++ (MSVC)
workspace for building libpng and zlib
vstudio => Contains a Microsoft Visual C++ (MSVC)
workspace for building libpng and zlib
scripts => Directory containing scripts for building libpng:
(see scripts/README.txt for the list of scripts)
Good luck, and happy coding.
-Glenn Randers-Pehrson (current maintainer, since 1998)
Internet: glennrp at users.sourceforge.net
-Andreas Eric Dilger (former maintainer, 1996-1997)
Internet: adilger at enel.ucalgary.ca
Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
(formerly of Group 42, Inc)
Internet: gschal at infinet.com

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/*
TODO - list of things to do for libpng:
Final bug fixes.
Better C++ wrapper/full C++ implementation?
Fix problem with C++ and EXTERN "C".
cHRM transformation.
Remove setjmp/longjmp usage in favor of returning error codes.
Palette creation.
Add "grayscale->palette" transformation and "palette->grayscale" detection.
Improved dithering.
Multi-lingual error and warning message support.
Complete sRGB transformation (presently it simply uses gamma=0.45455).
Make profile checking optional via a png_set_something() call.
Man pages for function calls.
Better documentation.
Better filter selection
(counting huffman bits/precompression? filter inertia? filter costs?).
Histogram creation.
Text conversion between different code pages (Latin-1 -> Mac and DOS).
Avoid building gamma tables whenever possible.
Use greater precision when changing to linear gamma for compositing against
background and doing rgb-to-gray transformation.
Investigate pre-incremented loop counters and other loop constructions.
Add interpolated method of handling interlacing.
Switch to the simpler zlib (zlib/libpng) license if legally possible.
Extend pngvalid.c to validate more of the libpng transformations.
*/

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/* arm_init.c - NEON optimised filter functions
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
* Last changed in libpng 1.6.16 [December 22, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* Below, after checking __linux__, various non-C90 POSIX 1003.1 functions are
* called.
*/
#define _POSIX_SOURCE 1
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
#if PNG_ARM_NEON_OPT > 0
#ifdef PNG_ARM_NEON_CHECK_SUPPORTED /* Do run-time checks */
/* WARNING: it is strongly recommended that you do not build libpng with
* run-time checks for CPU features if at all possible. In the case of the ARM
* NEON instructions there is no processor-specific way of detecting the
* presence of the required support, therefore run-time detection is extremely
* OS specific.
*
* You may set the macro PNG_ARM_NEON_FILE to the file name of file containing
* a fragment of C source code which defines the png_have_neon function. There
* are a number of implementations in contrib/arm-neon, but the only one that
* has partial support is contrib/arm-neon/linux.c - a generic Linux
* implementation which reads /proc/cpufino.
*/
#ifndef PNG_ARM_NEON_FILE
# ifdef __linux__
# define PNG_ARM_NEON_FILE "contrib/arm-neon/linux.c"
# endif
#endif
#ifdef PNG_ARM_NEON_FILE
#include <signal.h> /* for sig_atomic_t */
static int png_have_neon(png_structp png_ptr);
#include PNG_ARM_NEON_FILE
#else /* PNG_ARM_NEON_FILE */
# error "PNG_ARM_NEON_FILE undefined: no support for run-time ARM NEON checks"
#endif /* PNG_ARM_NEON_FILE */
#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
#ifndef PNG_ALIGNED_MEMORY_SUPPORTED
# error "ALIGNED_MEMORY is required; set: -DPNG_ALIGNED_MEMORY_SUPPORTED"
#endif
void
png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
{
/* The switch statement is compiled in for ARM_NEON_API, the call to
* png_have_neon is compiled in for ARM_NEON_CHECK. If both are defined
* the check is only performed if the API has not set the NEON option on
* or off explicitly. In this case the check controls what happens.
*
* If the CHECK is not compiled in and the option is UNSET the behavior prior
* to 1.6.7 was to use the NEON code - this was a bug caused by having the
* wrong order of the 'ON' and 'default' cases. UNSET now defaults to OFF,
* as documented in png.h
*/
#ifdef PNG_ARM_NEON_API_SUPPORTED
switch ((pp->options >> PNG_ARM_NEON) & 3)
{
case PNG_OPTION_UNSET:
/* Allow the run-time check to execute if it has been enabled -
* thus both API and CHECK can be turned on. If it isn't supported
* this case will fall through to the 'default' below, which just
* returns.
*/
#endif /* PNG_ARM_NEON_API_SUPPORTED */
#ifdef PNG_ARM_NEON_CHECK_SUPPORTED
{
static volatile sig_atomic_t no_neon = -1; /* not checked */
if (no_neon < 0)
no_neon = !png_have_neon(pp);
if (no_neon)
return;
}
#ifdef PNG_ARM_NEON_API_SUPPORTED
break;
#endif
#endif /* PNG_ARM_NEON_CHECK_SUPPORTED */
#ifdef PNG_ARM_NEON_API_SUPPORTED
default: /* OFF or INVALID */
return;
case PNG_OPTION_ON:
/* Option turned on */
break;
}
#endif
/* IMPORTANT: any new external functions used here must be declared using
* PNG_INTERNAL_FUNCTION in ../pngpriv.h. This is required so that the
* 'prefix' option to configure works:
*
* ./configure --with-libpng-prefix=foobar_
*
* Verify you have got this right by running the above command, doing a build
* and examining pngprefix.h; it must contain a #define for every external
* function you add. (Notice that this happens automatically for the
* initialization function.)
*/
pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
if (bpp == 3)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth3_neon;
}
else if (bpp == 4)
{
pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
png_read_filter_row_paeth4_neon;
}
}
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* READ */

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/* filter_neon.S - NEON optimised filter functions
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
* Last changed in libpng 1.6.16 [December 22, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
/* This is required to get the symbol renames, which are #defines, and the
* definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
*/
#define PNG_VERSION_INFO_ONLY
#include "../pngpriv.h"
#if defined(__linux__) && defined(__ELF__)
.section .note.GNU-stack,"",%progbits /* mark stack as non-executable */
#endif
#ifdef PNG_READ_SUPPORTED
/* Assembler NEON support - only works for 32-bit ARM (i.e. it does not work for
* ARM64). The code in arm/filter_neon_intrinsics.c supports ARM64, however it
* only works if -mfpu=neon is specified on the GCC command line. See pngpriv.h
* for the logic which sets PNG_USE_ARM_NEON_ASM:
*/
#if PNG_ARM_NEON_IMPLEMENTATION == 2 /* hand-coded assembler */
#if PNG_ARM_NEON_OPT > 0
#ifdef __ELF__
# define ELF
#else
# define ELF @
#endif
.arch armv7-a
.fpu neon
.macro func name, export=0
.macro endfunc
ELF .size \name, . - \name
.endfunc
.purgem endfunc
.endm
.text
/* Explicitly specifying alignment here because some versions of
* GAS don't align code correctly. This is harmless in correctly
* written versions of GAS.
*/
.align 2
.if \export
.global \name
.endif
ELF .type \name, STT_FUNC
.func \name
\name:
.endm
func png_read_filter_row_sub4_neon, export=1
ldr r3, [r0, #4] @ rowbytes
vmov.i8 d3, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vadd.u8 d0, d3, d4
vadd.u8 d1, d0, d5
vadd.u8 d2, d1, d6
vadd.u8 d3, d2, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r3, r3, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_sub3_neon, export=1
ldr r3, [r0, #4] @ rowbytes
vmov.i8 d3, #0
mov r0, r1
mov r2, #3
mov r12, #12
vld1.8 {q11}, [r0], r12
1:
vext.8 d5, d22, d23, #3
vadd.u8 d0, d3, d22
vext.8 d6, d22, d23, #6
vadd.u8 d1, d0, d5
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], r12
vst1.32 {d0[0]}, [r1,:32], r2
vadd.u8 d2, d1, d6
vst1.32 {d1[0]}, [r1], r2
vadd.u8 d3, d2, d7
vst1.32 {d2[0]}, [r1], r2
vst1.32 {d3[0]}, [r1], r2
subs r3, r3, #12
bgt 1b
bx lr
endfunc
func png_read_filter_row_up_neon, export=1
ldr r3, [r0, #4] @ rowbytes
1:
vld1.8 {q0}, [r1,:128]
vld1.8 {q1}, [r2,:128]!
vadd.u8 q0, q0, q1
vst1.8 {q0}, [r1,:128]!
subs r3, r3, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_avg4_neon, export=1
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vld4.32 {d16[],d17[],d18[],d19[]},[r2,:128]!
vhadd.u8 d0, d3, d16
vadd.u8 d0, d0, d4
vhadd.u8 d1, d0, d17
vadd.u8 d1, d1, d5
vhadd.u8 d2, d1, d18
vadd.u8 d2, d2, d6
vhadd.u8 d3, d2, d19
vadd.u8 d3, d3, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r12, r12, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_avg3_neon, export=1
push {r4,lr}
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
mov r0, r1
mov r4, #3
mov lr, #12
vld1.8 {q11}, [r0], lr
1:
vld1.8 {q10}, [r2], lr
vext.8 d5, d22, d23, #3
vhadd.u8 d0, d3, d20
vext.8 d17, d20, d21, #3
vadd.u8 d0, d0, d22
vext.8 d6, d22, d23, #6
vhadd.u8 d1, d0, d17
vext.8 d18, d20, d21, #6
vadd.u8 d1, d1, d5
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], lr
vst1.32 {d0[0]}, [r1,:32], r4
vhadd.u8 d2, d1, d18
vst1.32 {d1[0]}, [r1], r4
vext.8 d19, d21, d21, #1
vadd.u8 d2, d2, d6
vhadd.u8 d3, d2, d19
vst1.32 {d2[0]}, [r1], r4
vadd.u8 d3, d3, d7
vst1.32 {d3[0]}, [r1], r4
subs r12, r12, #12
bgt 1b
pop {r4,pc}
endfunc
.macro paeth rx, ra, rb, rc
vaddl.u8 q12, \ra, \rb @ a + b
vaddl.u8 q15, \rc, \rc @ 2*c
vabdl.u8 q13, \rb, \rc @ pa
vabdl.u8 q14, \ra, \rc @ pb
vabd.u16 q15, q12, q15 @ pc
vcle.u16 q12, q13, q14 @ pa <= pb
vcle.u16 q13, q13, q15 @ pa <= pc
vcle.u16 q14, q14, q15 @ pb <= pc
vand q12, q12, q13 @ pa <= pb && pa <= pc
vmovn.u16 d28, q14
vmovn.u16 \rx, q12
vbsl d28, \rb, \rc
vbsl \rx, \ra, d28
.endm
func png_read_filter_row_paeth4_neon, export=1
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
vmov.i8 d20, #0
1:
vld4.32 {d4[],d5[],d6[],d7[]}, [r1,:128]
vld4.32 {d16[],d17[],d18[],d19[]},[r2,:128]!
paeth d0, d3, d16, d20
vadd.u8 d0, d0, d4
paeth d1, d0, d17, d16
vadd.u8 d1, d1, d5
paeth d2, d1, d18, d17
vadd.u8 d2, d2, d6
paeth d3, d2, d19, d18
vmov d20, d19
vadd.u8 d3, d3, d7
vst4.32 {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
subs r12, r12, #16
bgt 1b
bx lr
endfunc
func png_read_filter_row_paeth3_neon, export=1
push {r4,lr}
ldr r12, [r0, #4] @ rowbytes
vmov.i8 d3, #0
vmov.i8 d4, #0
mov r0, r1
mov r4, #3
mov lr, #12
vld1.8 {q11}, [r0], lr
1:
vld1.8 {q10}, [r2], lr
paeth d0, d3, d20, d4
vext.8 d5, d22, d23, #3
vadd.u8 d0, d0, d22
vext.8 d17, d20, d21, #3
paeth d1, d0, d17, d20
vst1.32 {d0[0]}, [r1,:32], r4
vext.8 d6, d22, d23, #6
vadd.u8 d1, d1, d5
vext.8 d18, d20, d21, #6
paeth d2, d1, d18, d17
vext.8 d7, d23, d23, #1
vld1.8 {q11}, [r0], lr
vst1.32 {d1[0]}, [r1], r4
vadd.u8 d2, d2, d6
vext.8 d19, d21, d21, #1
paeth d3, d2, d19, d18
vst1.32 {d2[0]}, [r1], r4
vmov d4, d19
vadd.u8 d3, d3, d7
vst1.32 {d3[0]}, [r1], r4
subs r12, r12, #12
bgt 1b
pop {r4,pc}
endfunc
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 2 (assembler) */
#endif /* READ */

373
src/third-party/libpng/arm/filter_neon_intrinsics.c vendored Normal file
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/* filter_neon_intrinsics.c - NEON optimised filter functions
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by James Yu <james.yu at linaro.org>, October 2013.
* Based on filter_neon.S, written by Mans Rullgard, 2011.
*
* Last changed in libpng 1.6.16 [December 22, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*/
#include "../pngpriv.h"
#ifdef PNG_READ_SUPPORTED
/* This code requires -mfpu=neon on the command line: */
#if PNG_ARM_NEON_IMPLEMENTATION == 1 /* intrinsics code from pngpriv.h */
#include <arm_neon.h>
/* libpng row pointers are not necessarily aligned to any particular boundary,
* however this code will only work with appropriate alignment. arm/arm_init.c
* checks for this (and will not compile unless it is done). This code uses
* variants of png_aligncast to avoid compiler warnings.
*/
#define png_ptr(type,pointer) png_aligncast(type *,pointer)
#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer)
/* The following relies on a variable 'temp_pointer' being declared with type
* 'type'. This is written this way just to hide the GCC strict aliasing
* warning; note that the code is safe because there never is an alias between
* the input and output pointers.
*/
#define png_ldr(type,pointer)\
(temp_pointer = png_ptr(type,pointer), *temp_pointer)
#if PNG_ARM_NEON_OPT > 0
void
png_read_filter_row_up_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint8x16_t qrp, qpp;
qrp = vld1q_u8(rp);
qpp = vld1q_u8(pp);
qrp = vaddq_u8(qrp, qpp);
vst1q_u8(rp, qrp);
}
}
void
png_read_filter_row_sub3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp = vld1q_u8(rp);
uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp);
uint8x8x2_t vrp = *vrpt;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
for (; rp < rp_stop;)
{
uint8x8_t vtmp1, vtmp2;
uint32x2_t *temp_pointer;
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6);
vdest.val[1] = vadd_u8(vdest.val[0], vtmp1);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vdest.val[2] = vadd_u8(vdest.val[1], vtmp2);
vdest.val[3] = vadd_u8(vdest.val[2], vtmp1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t, &vtmp);
vrp = *vrpt;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
PNG_UNUSED(prev_row)
}
void
png_read_filter_row_sub4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
for (; rp < rp_stop; rp += 16)
{
uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp));
uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp);
uint8x8x4_t vrp = *vrpt;
uint32x2x4_t *temp_pointer;
vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]);
vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]);
vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]);
vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
}
PNG_UNUSED(prev_row)
}
void
png_read_filter_row_avg3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_const_bytep pp = prev_row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp;
uint8x8x2_t *vrpt;
uint8x8x2_t vrp;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
vtmp = vld1q_u8(rp);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
for (; rp < rp_stop; pp += 12)
{
uint8x8_t vtmp1, vtmp2, vtmp3;
uint8x8x2_t *vppt;
uint8x8x2_t vpp;
uint32x2_t *temp_pointer;
vtmp = vld1q_u8(pp);
vppt = png_ptr(uint8x8x2_t,&vtmp);
vpp = *vppt;
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6);
vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2);
vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2);
vdest.val[2] = vadd_u8(vdest.val[2], vtmp3);
vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2);
vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
}
void
png_read_filter_row_avg4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint32x2x4_t vtmp;
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
vrp = *vrpt;
vtmp = vld4_u32(png_ptrc(uint32_t,pp));
vppt = png_ptr(uint8x8x4_t,&vtmp);
vpp = *vppt;
vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]);
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]);
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]);
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
}
}
static uint8x8_t
paeth(uint8x8_t a, uint8x8_t b, uint8x8_t c)
{
uint8x8_t d, e;
uint16x8_t p1, pa, pb, pc;
p1 = vaddl_u8(a, b); /* a + b */
pc = vaddl_u8(c, c); /* c * 2 */
pa = vabdl_u8(b, c); /* pa */
pb = vabdl_u8(a, c); /* pb */
pc = vabdq_u16(p1, pc); /* pc */
p1 = vcleq_u16(pa, pb); /* pa <= pb */
pa = vcleq_u16(pa, pc); /* pa <= pc */
pb = vcleq_u16(pb, pc); /* pb <= pc */
p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */
d = vmovn_u16(pb);
e = vmovn_u16(p1);
d = vbsl_u8(d, b, c);
e = vbsl_u8(e, a, d);
return e;
}
void
png_read_filter_row_paeth3_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_const_bytep pp = prev_row;
png_bytep rp_stop = row + row_info->rowbytes;
uint8x16_t vtmp;
uint8x8x2_t *vrpt;
uint8x8x2_t vrp;
uint8x8_t vlast = vdup_n_u8(0);
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
vtmp = vld1q_u8(rp);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
for (; rp < rp_stop; pp += 12)
{
uint8x8x2_t *vppt;
uint8x8x2_t vpp;
uint8x8_t vtmp1, vtmp2, vtmp3;
uint32x2_t *temp_pointer;
vtmp = vld1q_u8(pp);
vppt = png_ptr(uint8x8x2_t,&vtmp);
vpp = *vppt;
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3);
vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3);
vdest.val[1] = paeth(vdest.val[0], vtmp2, vpp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[1], vtmp1);
vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6);
vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6);
vdest.val[2] = paeth(vdest.val[1], vtmp3, vtmp2);
vdest.val[2] = vadd_u8(vdest.val[2], vtmp1);
vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1);
vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1);
vtmp = vld1q_u8(rp + 12);
vrpt = png_ptr(uint8x8x2_t,&vtmp);
vrp = *vrpt;
vdest.val[3] = paeth(vdest.val[2], vtmp2, vtmp3);
vdest.val[3] = vadd_u8(vdest.val[3], vtmp1);
vlast = vtmp2;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0);
rp += 3;
vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0);
rp += 3;
}
}
void
png_read_filter_row_paeth4_neon(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_bytep rp = row;
png_bytep rp_stop = row + row_info->rowbytes;
png_const_bytep pp = prev_row;
uint8x8_t vlast = vdup_n_u8(0);
uint8x8x4_t vdest;
vdest.val[3] = vdup_n_u8(0);
for (; rp < rp_stop; rp += 16, pp += 16)
{
uint32x2x4_t vtmp;
uint8x8x4_t *vrpt, *vppt;
uint8x8x4_t vrp, vpp;
uint32x2x4_t *temp_pointer;
vtmp = vld4_u32(png_ptr(uint32_t,rp));
vrpt = png_ptr(uint8x8x4_t,&vtmp);
vrp = *vrpt;
vtmp = vld4_u32(png_ptrc(uint32_t,pp));
vppt = png_ptr(uint8x8x4_t,&vtmp);
vpp = *vppt;
vdest.val[0] = paeth(vdest.val[3], vpp.val[0], vlast);
vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]);
vdest.val[1] = paeth(vdest.val[0], vpp.val[1], vpp.val[0]);
vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]);
vdest.val[2] = paeth(vdest.val[1], vpp.val[2], vpp.val[1]);
vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]);
vdest.val[3] = paeth(vdest.val[2], vpp.val[3], vpp.val[2]);
vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]);
vlast = vpp.val[3];
vst4_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2x4_t,&vdest), 0);
}
}
#endif /* PNG_ARM_NEON_OPT > 0 */
#endif /* PNG_ARM_NEON_IMPLEMENTATION == 1 (intrinsics) */
#endif /* READ */

224
src/third-party/libpng/autogen.sh vendored Executable file
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@ -0,0 +1,224 @@
#! /bin/sh
#
# Run 'autoreconf' to build 'configure', 'Makefile.in' and other configure
# control files.
#
# The first time this is run on a GIT checkout the only files that exist are
# configure.ac and Makefile.am; all of the autotools support scripts are
# missing. They are instantiated with autoreconf --force --install.
#
# For regular ("tarball") distributions all the files should exist. We do not
# want them to be updated *under any circumstances*. It should never be
# necessary to run autogen.sh because ./configure --enable-maintainer-mode says
# what to do if Makefile.am or configure.ac are changed.
#
# It is *probably* OK to update the files on a GIT checkout, because they have
# come from the local tools, but leave that to the user who is assumed to know
# whether it is ok or required.
#
# This script is intended to work without arguments, there are, however, hidden
# arguments (a) for use while testing the script and (b) to fix up systems that
# have been broken. If (b) is required the script prompts for the correct
# options. For this reason the options are *NOT* documented in the help; this
# is deliberate; UTSL.
#
clean=
maintainer=
while test $# -gt 0
do
case "$1" in
--maintainer)
maintainer=1;;
--clean)
clean=1;;
*)
exec >&2
echo "$0: usage: ./autogen.sh"
if test -d .git
then
echo " ./autogen.sh generates the configure script and"
echo " Makefile.in, or refreshes them after changes to Makefile.am"
echo " or configure.ac. You may prefer to just run autoreconf."
elif test -z "$maintainer"
then
echo " DO NOT RUN THIS SCRIPT."
echo " If you need to change Makefile.am or configure.ac then you"
echo " also need to run ./configure --enable-maintainer-mode and"
echo " use the appropriate autotools, *NOT* this script, to update"
echo " everything, please check the documentation of autoreconf."
echo " WARNING: libpng is intentionally generated with a known,"
echo " fixed, set of autotools. It is known *NOT* to work with"
echo " the collection of autotools distributed on highly reputable"
echo " operating systems."
echo " Remember: autotools is GNU software, you are expected to"
echo " pay for support."
else
echo " You have run autogen.sh with --maintainer enabled and you"
echo " are not using a GIT distribution, then you have given an"
echo " unrecognized argument. This is not good. --maintainer"
echo " switches off any assumptions that you might not know what"
echo " you are doing."
fi
exit 1;;
esac
shift
done
#
# First check for a set of the autotools files; if absent then this is assumed
# to be a GIT version and the local autotools must be used. If present this
# is a tarball distribution and the script should not be used. If partially
# present bad things are happening.
#
# The autotools generated files:
libpng_autotools_files="Makefile.in aclocal.m4 config.guess config.h.in\
config.sub configure depcomp install-sh ltmain.sh missing test-driver"
#
# Files generated by versions of configue >2.68 or automake >1.13 (i.e. later
# versions than those required by configure.ac):
libpng_autotools_extra="compile"
#
# These are separate because 'maintainer-clean' does not remove them.
libpng_libtool_files="scripts/libtool.m4 scripts/ltoptions.m4\
scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4"
libpng_autotools_dirs="autom4te.cache" # not required
#
# The configure generated files:
libpng_configure_files="Makefile config.h config.log config.status\
libpng-config libpng.pc libtool stamp-h1"
libpng_configure_dirs=".deps"
#
# We must remove the configure generated files as well as the autotools
# generated files if autotools are regenerated because otherwise if configure
# has been run without "--enable-maintainer-mode" make can do a partial update
# of Makefile. These functions do the two bits of cleaning.
clean_autotools(){
rm -rf $libpng_autotools_files $libpng_libtool_files $libpng_autotools_dirs
rm -rf $libpng_autotools_extra
}
clean_configure(){
rm -rf $libpng_configure_files $libpng_configure_dirs
}
#
# Clean: remove everything (this is to help with testing)
if test -n "$clean"
then
clean_configure
if test -n "$maintainer"
then
clean_autotools
fi
exit 0
fi
#
# Validate the distribution.
libpng_autotools_file_found=
libpng_autotools_file_missing=
for file in $libpng_autotools_files
do
if test -f "$file"
then
libpng_autotools_file_found=1
else
libpng_autotools_file_missing=1
fi
done
#
# Presence of one of these does not *invalidate* missing, but absence
# invalidates found.
for file in $libpng_libtool_files
do
if test ! -f "$file"
then
libpng_autotools_file_missing=1
fi
done
#
# The cache directory doesn't matter - it will be regenerated and does not exist
# anyway in a tarball.
#
# Either everything is missing or everything is there, the --maintainer option
# just changes this so that the mode is set to generate all the files.
mode=
if test -z "$libpng_autotools_file_found" -o -n "$maintainer"
then
mode="autoreconf"
else
if test -n "$libpng_autotools_file_missing"
then
mode="broken"
else
mode="configure"
fi
fi
#
# So:
case "$mode" in
autoreconf)
# Clean in case configure files exist
clean_configure
clean_autotools
# Everything must be initialized, so use --force
if autoreconf --warnings=all --force --install
then
missing=
for file in $libpng_autotools_files
do
test -f "$file" || missing=1
done
# ignore the cache directory
test -z "$missing" || {
exec >&2
echo "autoreconf was run, but did not produce all the expected"
echo "files. It is likely that your autotools installation is"
echo "not compatible with that expected by libpng."
exit 1
}
else
exec >&2
echo "autoreconf failed: your version of autotools is incompatible"
echo "with this libpng version. Please use a distributed archive"
echo "(which includes the autotools generated files) and run configure"
echo "instead."
exit 1
fi;;
configure)
if test -d .git
then
exec >&2
echo "ERROR: running autoreconf on an initialized sytem"
echo " This is not necessary; it is only necessary to remake the"
echo " autotools generated files if Makefile.am or configure.ac"
echo " change and make does the right thing with:"
echo
echo " ./configure --enable-maintainer-mode."
echo
echo " You can run autoreconf yourself if you don't like maintainer"
echo " mode and you can also just run autoreconf -f -i to initialize"
echo " everything in the first place; this script is only for"
echo " compatibility with prior releases."
exit 1
else
exec >&2
echo "autogen.sh is intended only to generate 'configure' on systems"
echo "that do not have it. You have a complete 'configure', if you"
echo "need to change Makefile.am or configure.ac you also need to"
echo "run configure with the --enable-maintainer-mode option."
exit 1
fi;;
broken)
exec >&2
echo "Your system has a partial set of autotools generated files."
echo "autogen.sh is unable to proceed. The full set of files is"
echo "contained in the libpng 'tar' distribution archive and you do"
echo "not need to run autogen.sh if you use it."
exit 1;;
esac

347
src/third-party/libpng/compile vendored Executable file
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@ -0,0 +1,347 @@
#! /bin/sh
# Wrapper for compilers which do not understand '-c -o'.
scriptversion=2012-10-14.11; # UTC
# Copyright (C) 1999-2014 Free Software Foundation, Inc.
# Written by Tom Tromey <tromey@cygnus.com>.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.
# This file is maintained in Automake, please report
# bugs to <bug-automake@gnu.org> or send patches to
# <automake-patches@gnu.org>.
nl='
'
# We need space, tab and new line, in precisely that order. Quoting is
# there to prevent tools from complaining about whitespace usage.
IFS=" "" $nl"
file_conv=
# func_file_conv build_file lazy
# Convert a $build file to $host form and store it in $file
# Currently only supports Windows hosts. If the determined conversion
# type is listed in (the comma separated) LAZY, no conversion will
# take place.
func_file_conv ()
{
file=$1
case $file in
/ | /[!/]*) # absolute file, and not a UNC file
if test -z "$file_conv"; then
# lazily determine how to convert abs files
case `uname -s` in
MINGW*)
file_conv=mingw
;;
CYGWIN*)
file_conv=cygwin
;;
*)
file_conv=wine
;;
esac
fi
case $file_conv/,$2, in
*,$file_conv,*)
;;
mingw/*)
file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
;;
cygwin/*)
file=`cygpath -m "$file" || echo "$file"`
;;
wine/*)
file=`winepath -w "$file" || echo "$file"`
;;
esac
;;
esac
}
# func_cl_dashL linkdir
# Make cl look for libraries in LINKDIR
func_cl_dashL ()
{
func_file_conv "$1"
if test -z "$lib_path"; then
lib_path=$file
else
lib_path="$lib_path;$file"
fi
linker_opts="$linker_opts -LIBPATH:$file"
}
# func_cl_dashl library
# Do a library search-path lookup for cl
func_cl_dashl ()
{
lib=$1
found=no
save_IFS=$IFS
IFS=';'
for dir in $lib_path $LIB
do
IFS=$save_IFS
if $shared && test -f "$dir/$lib.dll.lib"; then
found=yes
lib=$dir/$lib.dll.lib
break
fi
if test -f "$dir/$lib.lib"; then
found=yes
lib=$dir/$lib.lib
break
fi
if test -f "$dir/lib$lib.a"; then
found=yes
lib=$dir/lib$lib.a
break
fi
done
IFS=$save_IFS
if test "$found" != yes; then
lib=$lib.lib
fi
}
# func_cl_wrapper cl arg...
# Adjust compile command to suit cl
func_cl_wrapper ()
{
# Assume a capable shell
lib_path=
shared=:
linker_opts=
for arg
do
if test -n "$eat"; then
eat=
else
case $1 in
-o)
# configure might choose to run compile as 'compile cc -o foo foo.c'.
eat=1
case $2 in
*.o | *.[oO][bB][jJ])
func_file_conv "$2"
set x "$@" -Fo"$file"
shift
;;
*)
func_file_conv "$2"
set x "$@" -Fe"$file"
shift
;;
esac
;;
-I)
eat=1
func_file_conv "$2" mingw
set x "$@" -I"$file"
shift
;;
-I*)
func_file_conv "${1#-I}" mingw
set x "$@" -I"$file"
shift
;;
-l)
eat=1
func_cl_dashl "$2"
set x "$@" "$lib"
shift
;;
-l*)
func_cl_dashl "${1#-l}"
set x "$@" "$lib"
shift
;;
-L)
eat=1
func_cl_dashL "$2"
;;
-L*)
func_cl_dashL "${1#-L}"
;;
-static)
shared=false
;;
-Wl,*)
arg=${1#-Wl,}
save_ifs="$IFS"; IFS=','
for flag in $arg; do
IFS="$save_ifs"
linker_opts="$linker_opts $flag"
done
IFS="$save_ifs"
;;
-Xlinker)
eat=1
linker_opts="$linker_opts $2"
;;
-*)
set x "$@" "$1"
shift
;;
*.cc | *.CC | *.cxx | *.CXX | *.[cC]++)
func_file_conv "$1"
set x "$@" -Tp"$file"
shift
;;
*.c | *.cpp | *.CPP | *.lib | *.LIB | *.Lib | *.OBJ | *.obj | *.[oO])
func_file_conv "$1" mingw
set x "$@" "$file"
shift
;;
*)
set x "$@" "$1"
shift
;;
esac
fi
shift
done
if test -n "$linker_opts"; then
linker_opts="-link$linker_opts"
fi
exec "$@" $linker_opts
exit 1
}
eat=
case $1 in
'')
echo "$0: No command. Try '$0 --help' for more information." 1>&2
exit 1;
;;
-h | --h*)
cat <<\EOF
Usage: compile [--help] [--version] PROGRAM [ARGS]
Wrapper for compilers which do not understand '-c -o'.
Remove '-o dest.o' from ARGS, run PROGRAM with the remaining
arguments, and rename the output as expected.
If you are trying to build a whole package this is not the
right script to run: please start by reading the file 'INSTALL'.
Report bugs to <bug-automake@gnu.org>.
EOF
exit $?
;;
-v | --v*)
echo "compile $scriptversion"
exit $?
;;
cl | *[/\\]cl | cl.exe | *[/\\]cl.exe )
func_cl_wrapper "$@" # Doesn't return...
;;
esac
ofile=
cfile=
for arg
do
if test -n "$eat"; then
eat=
else
case $1 in
-o)
# configure might choose to run compile as 'compile cc -o foo foo.c'.
# So we strip '-o arg' only if arg is an object.
eat=1
case $2 in
*.o | *.obj)
ofile=$2
;;
*)
set x "$@" -o "$2"
shift
;;
esac
;;
*.c)
cfile=$1
set x "$@" "$1"
shift
;;
*)
set x "$@" "$1"
shift
;;
esac
fi
shift
done
if test -z "$ofile" || test -z "$cfile"; then
# If no '-o' option was seen then we might have been invoked from a
# pattern rule where we don't need one. That is ok -- this is a
# normal compilation that the losing compiler can handle. If no
# '.c' file was seen then we are probably linking. That is also
# ok.
exec "$@"
fi
# Name of file we expect compiler to create.
cofile=`echo "$cfile" | sed 's|^.*[\\/]||; s|^[a-zA-Z]:||; s/\.c$/.o/'`
# Create the lock directory.
# Note: use '[/\\:.-]' here to ensure that we don't use the same name
# that we are using for the .o file. Also, base the name on the expected
# object file name, since that is what matters with a parallel build.
lockdir=`echo "$cofile" | sed -e 's|[/\\:.-]|_|g'`.d
while true; do
if mkdir "$lockdir" >/dev/null 2>&1; then
break
fi
sleep 1
done
# FIXME: race condition here if user kills between mkdir and trap.
trap "rmdir '$lockdir'; exit 1" 1 2 15
# Run the compile.
"$@"
ret=$?
if test -f "$cofile"; then
test "$cofile" = "$ofile" || mv "$cofile" "$ofile"
elif test -f "${cofile}bj"; then
test "${cofile}bj" = "$ofile" || mv "${cofile}bj" "$ofile"
fi
rmdir "$lockdir"
exit $ret
# Local Variables:
# mode: shell-script
# sh-indentation: 2
# eval: (add-hook 'write-file-hooks 'time-stamp)
# time-stamp-start: "scriptversion="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC"
# time-stamp-end: "; # UTC"
# End:

1421
src/third-party/libpng/config.guess vendored Executable file
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108
src/third-party/libpng/config.h.in vendored Normal file
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@ -0,0 +1,108 @@
/* config.h.in. Generated from configure.ac by autoheader. */
/* Define to 1 if you have the <dlfcn.h> header file. */
#undef HAVE_DLFCN_H
/* Define to 1 if you have the `feenableexcept' function. */
#undef HAVE_FEENABLEEXCEPT
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* Define to 1 if you have the `m' library (-lm). */
#undef HAVE_LIBM
/* Define to 1 if you have the `z' library (-lz). */
#undef HAVE_LIBZ
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the `memset' function. */
#undef HAVE_MEMSET
/* Define to 1 if you have the `pow' function. */
#undef HAVE_POW
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to the sub-directory where libtool stores uninstalled libraries. */
#undef LT_OBJDIR
/* Name of package */
#undef PACKAGE
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the home page for this package. */
#undef PACKAGE_URL
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Turn on ARM Neon optimizations at run-time */
#undef PNG_ARM_NEON_API_SUPPORTED
/* Check for ARM Neon support at run-time */
#undef PNG_ARM_NEON_CHECK_SUPPORTED
/* Enable ARM Neon optimizations */
#undef PNG_ARM_NEON_OPT
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Define to 1 if your <sys/time.h> declares `struct tm'. */
#undef TM_IN_SYS_TIME
/* Version number of package */
#undef VERSION
/* Define to empty if `const' does not conform to ANSI C. */
#undef const
/* Define to the equivalent of the C99 'restrict' keyword, or to
nothing if this is not supported. Do not define if restrict is
supported directly. */
#undef restrict
/* Work around a bug in Sun C++: it does not support _Restrict or
__restrict__, even though the corresponding Sun C compiler ends up with
"#define restrict _Restrict" or "#define restrict __restrict__" in the
previous line. Perhaps some future version of Sun C++ will work with
restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
#if defined __SUNPRO_CC && !defined __RESTRICT
# define _Restrict
# define __restrict__
#endif
/* Define to `unsigned int' if <sys/types.h> does not define. */
#undef size_t

1807
src/third-party/libpng/config.sub vendored Executable file
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15812
src/third-party/libpng/configure vendored Executable file
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324
src/third-party/libpng/configure.ac vendored Normal file
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@ -0,0 +1,324 @@
# configure.ac
dnl Process this file with autoconf to produce a configure script.
dnl
dnl Minor upgrades (compatible ABI): increment the package version
dnl (third field in two places below) and set the PNGLIB_RELEASE
dnl variable.
dnl
dnl Major upgrades (incompatible ABI): increment the package major
dnl version (second field, or first if desired), set the minor
dnl to 0, set PNGLIB_MAJOR below *and* follow the instructions in
dnl Makefile.am to upgrade the package name.
dnl This is here to prevent earlier autoconf from being used, it
dnl should not be necessary to regenerate configure if the time
dnl stamps are correct
AC_PREREQ([2.68])
dnl Version number stuff here:
AC_INIT([libpng],[1.6.17],[png-mng-implement@lists.sourceforge.net])
AC_CONFIG_MACRO_DIR([scripts])
# libpng does not follow GNU file name conventions (hence 'foreign')
# color-tests requires automake 1.11 or later
# silent-rules requires automake 1.11 or later
# dist-xz requires automake 1.11 or later
# 1.12.2 fixes a security issue in 1.11.2 and 1.12.1
# 1.13 is required for parallel tests
AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules subdir-objects])
# The following line causes --disable-maintainer-mode to be the default to
# configure, this is necessary because libpng distributions cannot rely on the
# time stamps of the autotools generated files being correct
AM_MAINTAINER_MODE
dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later
dnl version; aclocal.m4 will generate a failure if you use a prior version of
dnl automake, so the following is not necessary (and is not defined anyway):
dnl AM_PREREQ([1.11.2])
dnl stop configure from automagically running automake
PNGLIB_VERSION=1.6.17
PNGLIB_MAJOR=1
PNGLIB_MINOR=6
PNGLIB_RELEASE=17
dnl End of version number stuff
AC_CONFIG_SRCDIR([pngget.c])
AC_CONFIG_HEADERS([config.h])
# Checks for programs.
AC_LANG([C])
AC_PROG_CC
AM_PROG_AS
LT_PATH_LD
AC_PROG_CPP
AC_PROG_AWK
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_MAKE_SET
dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any
dnl compatible later version may be used
LT_INIT([win32-dll])
LT_PREREQ([2.4.2])
# Some awks crash when confronted with pnglibconf.dfa, do a test run now
# to make sure this doesn't happen
AC_MSG_CHECKING([that AWK works])
if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
${srcdir}/pngusr.dfa 1>&2
then
AC_MSG_RESULT([ok])
else
AC_MSG_FAILURE([failed], 1)
fi
# This is a remnant of the old cc -E validation, where it may have been
# necessary to use a different preprocessor for .dfn files
DFNCPP="$CPP"
AC_SUBST(DFNCPP)
# -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
# checks the compiler with a program that generates a warning), add the
# following option to deal with this
AC_ARG_VAR(PNG_COPTS,
[additional flags for the C compiler, use this for options that would]
[cause configure itself to fail])
AC_ARG_ENABLE(werror,
AS_HELP_STRING([[[--enable-werror[=OPT]]]],
[Pass -Werror or the given argument to the compiler if it is supported]),
[test "$enable_werror" = "yes" && enable_werror="-Werror"
if test "$enable_werror" != "no"; then
sav_CFLAGS="$CFLAGS"
CFLAGS="$enable_werror $CFLAGS"
AC_MSG_CHECKING([if the compiler allows $enable_werror])
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([
[int main(int argc, char **argv){]
[return argv[argc-1][0];]
[}]])],
AC_MSG_RESULT(yes)
PNG_COPTS="$PNG_COPTS $enable_werror",
AC_MSG_RESULT(no))
CFLAGS="$sav_CFLAGS"
fi],)
# Checks for header files.
AC_HEADER_STDC
# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
AC_STRUCT_TM
AC_C_RESTRICT
# Checks for library functions.
AC_FUNC_STRTOD
AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc))
AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) )
AC_ARG_WITH(zlib-prefix,
AS_HELP_STRING([[[--with-zlib-prefix]]],
[prefix that may have been used in installed zlib]),
[ZPREFIX=${withval}],
[ZPREFIX='z_'])
AC_CHECK_LIB(z, zlibVersion, ,
AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed)))
# The following is for pngvalid, to ensure it catches FP errors even on
# platforms that don't enable FP exceptions, the function appears in the math
# library (typically), it's not an error if it is not found.
AC_CHECK_LIB([m], [feenableexcept])
AC_CHECK_FUNCS([feenableexcept])
AC_MSG_CHECKING([if using Solaris linker])
SLD=`$LD --version 2>&1 | grep Solaris`
if test "$SLD"; then
have_solaris_ld=yes
AC_MSG_RESULT(yes)
else
have_solaris_ld=no
AC_MSG_RESULT(no)
fi
AM_CONDITIONAL(HAVE_SOLARIS_LD, test "$have_solaris_ld" = "yes")
AC_MSG_CHECKING([if libraries can be versioned])
# Special case for PE/COFF platforms: ld reports
# support for version-script, but doesn't actually
# DO anything with it.
case $host in
*cygwin* | *mingw32* | *interix* )
have_ld_version_script=no
AC_MSG_RESULT(no)
;;
* )
if test "$have_solaris_ld" = "yes"; then
GLD=`$LD --help < /dev/null 2>&1 | grep 'M mapfile'`
else
GLD=`$LD --help < /dev/null 2>/dev/null | grep version-script`
fi
if test "$GLD"; then
have_ld_version_script=yes
AC_MSG_RESULT(yes)
else
have_ld_version_script=no
AC_MSG_RESULT(no)
AC_MSG_WARN(*** You have not enabled versioned symbols.)
fi
;;
esac
AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
if test "$have_ld_version_script" = "yes"; then
AC_MSG_CHECKING([for symbol prefix])
SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
| ${CPP-${CC-gcc} -E} - 2>&1 \
| ${EGREP-grep} "^PREFIX=" \
| ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
AC_SUBST(SYMBOL_PREFIX)
AC_MSG_RESULT($SYMBOL_PREFIX)
fi
# Substitutions for .in files
AC_SUBST(PNGLIB_VERSION)
AC_SUBST(PNGLIB_MAJOR)
AC_SUBST(PNGLIB_MINOR)
AC_SUBST(PNGLIB_RELEASE)
# Additional arguments (and substitutions)
# Allow the pkg-config directory to be set
AC_ARG_WITH(pkgconfigdir,
AS_HELP_STRING([[[--with-pkgconfigdir]]],
[Use the specified pkgconfig dir (default is libdir/pkgconfig)]),
[pkgconfigdir=${withval}],
[pkgconfigdir='${libdir}/pkgconfig'])
AC_SUBST([pkgconfigdir])
AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]])
# Make the *-config binary config scripts optional
AC_ARG_WITH(binconfigs,
AS_HELP_STRING([[[--with-binconfigs]]],
[Generate shell libpng-config scripts as well as pkg-config data]
[@<:@default=yes@:>@]),
[if test "${withval}" = no; then
binconfigs=
AC_MSG_NOTICE([[libpng-config scripts will not be built]])
else
binconfigs='${binconfigs}'
fi],
[binconfigs='${binconfigs}'])
AC_SUBST([binconfigs])
# Support for prefixes to the API function names; this will generate defines
# at the start of the build to rename exported library functions
AC_ARG_WITH(libpng-prefix,
AS_HELP_STRING([[[--with-libpng-prefix]]],
[prefix libpng exported function (API) names with the given value]),
[if test "${withval:-no}" != "no"; then
AC_SUBST([PNG_PREFIX], [${withval}])
fi])
AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
# Control over what links are made for installed files. Versioned files are
# always installed, when the following options are turned on corresponding
# unversioned links are also created (normally as symbolic links):
AC_ARG_ENABLE([unversioned-links],
AS_HELP_STRING([[[--enable-unversioned-links]]],
[Installed libpng header files are placed in a versioned subdirectory]
[and installed libpng library (including DLL) files are versioned.]
[If this option is enabled unversioned links will be created pointing to]
[the corresponding installed files. If you use libpng.pc or]
[libpng-config for all builds you do not need these links, but if you]
[compile programs directly they will typically #include <png.h> and]
[link with -lpng; in that case you need the links.]
[The links can be installed manually using 'make install-header-links']
[and 'make install-library-links' and can be removed using the]
[corresponding uninstall- targets. If you do enable this option every]
[libpng 'make install' will recreate the links to point to the just]
[installed version of libpng. The default is to create the links;]
[use --disable-unversioned-links to change this]))
# The AM_CONDITIONAL test is written so that the default is enabled;
# --disable-unversioned-links must be given to turn the option off.
AM_CONDITIONAL([DO_INSTALL_LINKS],[test "$enable_unversioned_links" != "no"])
AC_ARG_ENABLE([unversioned-libpng-pc],
AS_HELP_STRING([[[--enable-unversioned-libpng-pc]]],
[Install the configuration file 'libpng.pc' as a link to the versioned]
[version. This is done by default - use --disable-unversioned-libpng-pc]
[to change this.]))
AM_CONDITIONAL([DO_INSTALL_LIBPNG_PC],
[test "$enable_unversioned_libpng_pc" != "no"])
AC_ARG_ENABLE([unversioned-libpng-config],
AS_HELP_STRING([[[--enable-unversioned-libpng-config]]],
[Install the configuration file 'libpng-config' as a link to the]
[versioned version. This is done by default - use]
[--disable-unversioned-libpng-config to change this.]))
AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
[test "$enable_unversioned_libpng_config" != "no"])
# HOST SPECIFIC OPTIONS
# =====================
#
# ARM
# ===
#
# ARM NEON (SIMD) support.
AC_ARG_ENABLE([arm-neon],
AS_HELP_STRING([[[--enable-arm-neon]]],
[Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
[no/off: disable the optimizations; check: use internal checking code]
[(deprecated and poorly supported); api: disable by default, enable by]
[a call to png_set_option; yes/on: turn on unconditionally.]
[If not specified: determined by the compiler.]),
[case "$enableval" in
no|off)
# disable the default enabling on __ARM_NEON__ systems:
AC_DEFINE([PNG_ARM_NEON_OPT], [0],
[Disable ARM Neon optimizations])
# Prevent inclusion of the assembler files below:
enable_arm_neon=no;;
check)
AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
[Check for ARM Neon support at run-time]);;
api)
AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
[Turn on ARM Neon optimizations at run-time]);;
yes|on)
AC_DEFINE([PNG_ARM_NEON_OPT], [2],
[Enable ARM Neon optimizations])
AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if]
[you want the optimizations unconditionally pass -mfpu=neon]
[to the compiler.]);;
*)
AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value])
esac])
# Add ARM specific files to all builds where the host_cpu is arm ('arm*') or
# where ARM optimizations were explicitly requested (this allows a fallback if a
# future host CPU does not match 'arm*')
AM_CONDITIONAL([PNG_ARM_NEON],
[test "$enable_arm_neon" != 'no' &&
case "$host_cpu" in
arm*|aarch64*) :;;
*) test "$enable_arm_neon" != '';;
esac])
AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
# Config files, substituting as above
AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
AC_CONFIG_FILES([libpng-config:libpng-config.in],
[chmod +x libpng-config])
AC_OUTPUT

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This "contrib" directory contains contributions which are not necessarily under
the libpng license, although all are open source. They are not part of
libpng proper and are not used for building the library.

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OPERATING SYSTEM SPECIFIC ARM NEON DETECTION
--------------------------------------------
Detection of the ability to exexcute ARM NEON on an ARM processor requires
operating system support. (The information is not available in user mode.)
HOW TO USE THIS
---------------
This directory contains C code fragments that can be included in arm/arm_init.c
by setting the macro PNG_ARM_NEON_FILE to the file name in "" or <> at build
time. This setting is not recorded in pnglibconf.h and can be changed simply by
rebuilding arm/arm_init.o with the required macro definition.
For any of this code to be used the ARM NEON code must be enabled and run time
checks must be supported. I.e.:
#if PNG_ARM_NEON_OPT > 0
#ifdef PNG_ARM_NEON_CHECK_SUPPORTED
This is done in a 'configure' build by passing configure the argument:
--enable-arm-neon=check
Apart from the basic Linux implementation in contrib/arm-neon/linux.c this code
is unsupported. That means that it is not even compiled on a regular basis and
may be broken in any given minor release.
FILE FORMAT
-----------
Each file documents its testing status as of the last time it was tested (which
may have been a long time ago):
STATUS: one of:
SUPPORTED: This indicates that the file is included in the regularly
performed test builds and bugs are fixed when discovered.
COMPILED: This indicates that the code did compile at least once. See the
more detailed description for the extent to which the result was
successful.
TESTED: This means the code was fully compiled into the libpng test programs
and these were run at least once.
BUG REPORTS: an email address to which to send reports of problems
The file is a fragment of C code. It should not define any 'extern' symbols;
everything should be static. It must define the function:
static int png_have_neon(png_structp png_ptr);
That function must return 1 if ARM NEON instructions are supported, 0 if not.
It must not execute png_error unless it detects a bug. A png_error will prevent
the reading of the PNG and in the future, writing too.
BUG REPORTS
-----------
If you mail a bug report for any file that is not SUPPORTED there may only be
limited response. Consider fixing it and sending a patch to fix the problem -
this is more likely to result in action.
CONTRIBUTIONS
-------------
You may send contributions of new implementations to
png-mng-implement@sourceforge.net. Please write code in strict C90 C where
possible. Obviously OS dependencies are to be expected. If you submit code you
must have the authors permission and it must have a license that is acceptable
to the current maintainer; in particular that license must permit modification
and redistribution.
Please try to make the contribution a single file and give the file a clear and
unambiguous name that identifies the target OS. If multiple files really are
required put them all in a sub-directory.
You must also be prepared to handle bug reports from users of the code, either
by joining the png-mng-implement mailing list or by providing an email for the
"BUG REPORTS" entry or both. Please make sure that the header of the file
contains the STATUS and BUG REPORTS fields as above.
Please list the OS requirements as precisely as possible. Ideally you should
also list the environment in which the code has been tested and certainly list
any environments where you suspect it might not work.

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/* contrib/arm-neon/android-ndk.c
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by John Bowler, 2014.
* Last changed in libpng 1.6.10 [March 6, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* SEE contrib/arm-neon/README before reporting bugs
*
* STATUS: COMPILED, UNTESTED
* BUG REPORTS: png-mng-implement@sourceforge.net
*
* png_have_neon implemented for the Android NDK, see:
*
* Documentation:
* http://www.kandroid.org/ndk/docs/CPU-ARM-NEON.html
* http://code.google.com/p/android/issues/detail?id=49065
*
* NOTE: this requires that libpng is built against the Android NDK and linked
* with an implementation of the Android ARM 'cpu-features' library. The code
* has been compiled only, not linked: no version of the library has been found,
* only the header files exist in the NDK.
*/
#include <cpu-features.h>
static int
png_have_neon(png_structp png_ptr)
{
/* This is a whole lot easier than the linux code, however it is probably
* implemented as below, therefore it is better to cache the result (these
* function calls may be slow!)
*/
PNG_UNUSED(png_ptr)
return android_getCpuFamily() == ANDROID_CPU_FAMILY_ARM &&
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
}

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/* contrib/arm-neon/linux-auxv.c
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by Mans Rullgard, 2011.
* Last changed in libpng 1.6.10 [March 6, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* SEE contrib/arm-neon/README before reporting bugs
*
* STATUS: COMPILED, TESTED
* BUG REPORTS: png-mng-implement@sourceforge.net
*
* png_have_neon implemented for Linux versions which allow access to
* /proc/self/auxv. This is probably faster, cleaner and safer than the code to
* read /proc/cpuinfo in contrib/arm-neon/linux, however it is yet another piece
* of potentially untested code and has more complex dependencies than the code
* to read cpuinfo.
*
* This generic __linux__ implementation requires reading /proc/self/auxv and
* looking at each element for one that records NEON capabilities.
*/
#include <unistd.h> /* for POSIX 1003.1 */
#include <errno.h> /* for EINTR */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <elf.h>
#include <asm/hwcap.h>
/* A read call may be interrupted, in which case it returns -1 and sets errno to
* EINTR if nothing was done, otherwise (if something was done) a partial read
* may result.
*/
static size_t
safe_read(png_structp png_ptr, int fd, void *buffer_in, size_t nbytes)
{
size_t ntotal = 0;
char *buffer = png_voidcast(char*, buffer_in);
while (nbytes > 0)
{
unsigned int nread;
int iread;
/* Passing nread > INT_MAX to read is implementation defined in POSIX
* 1003.1, therefore despite the unsigned argument portable code must
* limit the value to INT_MAX!
*/
if (nbytes > INT_MAX)
nread = INT_MAX;
else
nread = (unsigned int)/*SAFE*/nbytes;
iread = read(fd, buffer, nread);
if (iread == -1)
{
/* This is the devil in the details, a read can terminate early with 0
* bytes read because of EINTR, yet it still returns -1 otherwise end
* of file cannot be distinguished.
*/
if (errno != EINTR)
{
png_warning(png_ptr, "/proc read failed");
return 0; /* I.e., a permanent failure */
}
}
else if (iread < 0)
{
/* Not a valid 'read' result: */
png_warning(png_ptr, "OS /proc read bug");
return 0;
}
else if (iread > 0)
{
/* Continue reading until a permanent failure, or EOF */
buffer += iread;
nbytes -= (unsigned int)/*SAFE*/iread;
ntotal += (unsigned int)/*SAFE*/iread;
}
else
return ntotal;
}
return ntotal; /* nbytes == 0 */
}
static int
png_have_neon(png_structp png_ptr)
{
int fd = open("/proc/self/auxv", O_RDONLY);
Elf32_auxv_t aux;
/* Failsafe: failure to open means no NEON */
if (fd == -1)
{
png_warning(png_ptr, "/proc/self/auxv open failed");
return 0;
}
while (safe_read(png_ptr, fd, &aux, sizeof aux) == sizeof aux)
{
if (aux.a_type == AT_HWCAP && (aux.a_un.a_val & HWCAP_NEON) != 0)
{
close(fd);
return 1;
}
}
close(fd);
return 0;
}

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/* contrib/arm-neon/linux.c
*
* Copyright (c) 2014 Glenn Randers-Pehrson
* Written by John Bowler, 2014.
* Last changed in libpng 1.6.16 [December 22, 2014]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* SEE contrib/arm-neon/README before reporting bugs
*
* STATUS: SUPPORTED
* BUG REPORTS: png-mng-implement@sourceforge.net
*
* png_have_neon implemented for Linux by reading the widely available
* pseudo-file /proc/cpuinfo.
*
* This code is strict ANSI-C and is probably moderately portable; it does
* however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
*/
#include <stdio.h>
static int
png_have_neon(png_structp png_ptr)
{
FILE *f = fopen("/proc/cpuinfo", "rb");
if (f != NULL)
{
/* This is a simple state machine which reads the input byte-by-byte until
* it gets a match on the 'neon' feature or reaches the end of the stream.
*/
static const char ch_feature[] = { 70, 69, 65, 84, 85, 82, 69, 83 };
static const char ch_neon[] = { 78, 69, 79, 78 };
enum
{
StartLine, Feature, Colon, StartTag, Neon, HaveNeon, SkipTag, SkipLine
} state;
int counter;
for (state=StartLine, counter=0;;)
{
int ch = fgetc(f);
if (ch == EOF)
{
/* EOF means error or end-of-file, return false; neon at EOF is
* assumed to be a mistake.
*/
fclose(f);
return 0;
}
switch (state)
{
case StartLine:
/* Match spaces at the start of line */
if (ch <= 32) /* skip control characters and space */
break;
counter=0;
state = Feature;
/* FALL THROUGH */
case Feature:
/* Match 'FEATURE', ASCII case insensitive. */
if ((ch & ~0x20) == ch_feature[counter])
{
if (++counter == (sizeof ch_feature))
state = Colon;
break;
}
/* did not match 'feature' */
state = SkipLine;
/* FALL THROUGH */
case SkipLine:
skipLine:
/* Skip everything until we see linefeed or carriage return */
if (ch != 10 && ch != 13)
break;
state = StartLine;
break;
case Colon:
/* Match any number of space or tab followed by ':' */
if (ch == 32 || ch == 9)
break;
if (ch == 58) /* i.e. ':' */
{
state = StartTag;
break;
}
/* Either a bad line format or a 'feature' prefix followed by
* other characters.
*/
state = SkipLine;
goto skipLine;
case StartTag:
/* Skip space characters before a tag */
if (ch == 32 || ch == 9)
break;
state = Neon;
counter = 0;
/* FALL THROUGH */
case Neon:
/* Look for 'neon' tag */
if ((ch & ~0x20) == ch_neon[counter])
{
if (++counter == (sizeof ch_neon))
state = HaveNeon;
break;
}
state = SkipTag;
/* FALL THROUGH */
case SkipTag:
/* Skip non-space characters */
if (ch == 10 || ch == 13)
state = StartLine;
else if (ch == 32 || ch == 9)
state = StartTag;
break;
case HaveNeon:
/* Have seen a 'neon' prefix, but there must be a space or new
* line character to terminate it.
*/
if (ch == 10 || ch == 13 || ch == 32 || ch == 9)
{
fclose(f);
return 1;
}
state = SkipTag;
break;
default:
png_error(png_ptr, "png_have_neon: internal error (bug)");
}
}
}
#ifdef PNG_WARNINGS_SUPPORTED
else
png_warning(png_ptr, "/proc/cpuinfo open failed");
#endif
return 0;
}

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This directory contains test configuration files, currently always '.dfa' files
intended to be used in the build by setting the make macro DFA_XTRA to the name
of the file.
These files are used in release validation of the 'configure' builds of libpng
by building 'make check', or 'make all-am' for cross-builds, with each .dfa
file.
The files in this directory may change between minor releases, however
contributions describing specific builds of libpng are welcomed. There is no
guarantee that libpng will continue to build with such configurations; support
for given configurations can be, and has been, dropped between successive minor
releases. However if a .dfa file describing a configuration is not in this
directory it is very unlikely that it will be tested before a minor release!
You can use these .dfa files as the basis of new configurations. Files in this
directory should not have any use restrictions or restrictive licenses.
This directory is not included in the .zip and .7z distributions, which do
not contain 'configure' scripts.
DOCUMENTATION
=============
Examples:
${srcdir}/pngusr.dfa
${srcdir}/contrib/pngminim/*/pngusr.dfa
Documentation of the options:
${srcdir}/scripts/pnglibconf.dfa
Documentation of the file format:
${srcdir}/scripts/options.awk
FILE NAMING
===========
File names in this directory may NOT contain any of the five characters:
- , + * ?
Neither may they contain any space character.
While other characters may be used it is strongly suggested that file names be
limited to lower case Latiin alphabetic characters (a-z), digits (0-9) and, if
necessary the underscore (_) character. File names should be about 8 characters
long (excluding the .dfa extension). Submitted .dfa files should have names
between 7 and 16 characters long, shorter names (6 characters or less) are
reserved for standard tests.

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# read.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with basic read support. This enables the lowest level libpng
# read API - the one where the calling code has to use a loop to read each row.
# At present this is the API used by most programs.
#
# Support is enabled only for those chunks and transformations that are
# typically required - others can be added easily.
#
everything = off
# The sequential read code is enabled here; the progressive code can be used
# instead but there is no point enabling both.
option SEQUENTIAL_READ on
# Likewise it is pointless enabling both fixed and floating point APIs. Choose
# one or the other for both the API and the internal math.
#Fixed point:
#option FIXED_POINT on
#option FLOATING_ARITHMETIC off
#Floating point:
option FLOATING_POINT on
option FLOATING_ARITHMETIC on
# Basic error handling, IO and user memory support. The latter allows the
# application program to provide its own implementations of 'malloc' and 'free'.
option SETJMP on
option STDIO on
option USER_MEM on
# To read the full set of PNG images correctly interlace, transparency and
# 16-bit support is required. The application can implement interlace itself,
# but very few do and it's no longer possible to disable it when READ is
# enabled.
option READ_tRNS on
option READ_16BIT on
# Everything else is application dependent. This file assumes the app handles
# all the native PNG bit layouts, so it doesn't need any of layout change
# transforms, but needs libpng to perform gamma correction. It doesn't do any
# colorspace stuff and ignores the 'significant bit' information.
#
# If your app always expands the image to a limited set of bit layouts you
# probably want to consider using the simplified API instead of the low level
# one - see png.h and s_read.dfa.
option READ_GAMMA on

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# s_read.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with simplified read support (only). This builds a minimal
# libpng able to read all PNG formats and convert them into a small number of
# well understood memory formats.
#
everything = off
option SIMPLIFIED_READ on
# It isn't necessary to chose fixed or floating point for the APIs because the
# simplified API doesn't need fixed or floating point numbers. It is necessary
# to chose an internal math implementation. The default (because of 'everything
# = off') is fixed point - turn the floating point implementation on if you have
# hardware floating point or prefer your software floating point implementation.
option FLOATING_ARITHMETIC on
# This is not strictly necessary, but without it the message strings in the API
# will not be filled in
option ERROR_TEXT on
# Switching these options on enables the 'AFIRST' and 'BGR' formats - you don't
# need this if you don't use them, they just allow the in-memory layout to be
# changed to match common hardware formats.
option SIMPLIFIED_READ_AFIRST on
option SIMPLIFIED_READ_BGR on

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# s_write.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with (just) simplified write support
#
everything = off
option SIMPLIFIED_WRITE on
# It isn't necessary to chose fixed or floating point for the APIs because the
# simplified API doesn't need fixed or floating point numbers. It is necessary
# to chose an internal math implementation. The default (because of 'everything
# = off') is fixed point - turn the floating point implementation on if you have
# hardware floating point or prefer your software floating point implementation.
option FLOATING_ARITHMETIC on
# This is not strictly necessary, but without it the message strings in the API
# will not be filled in
option ERROR_TEXT on
# Switching these options on enables the 'AFIRST' and 'BGR' formats - you don't
# need this if you don't use them, they just allow the in-memory layout to be
# changed to match common hardware formats.
option SIMPLIFIED_WRITE_AFIRST on
option SIMPLIFIED_WRITE_BGR on

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# simple.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with just the simplified APIs (read and write).
#
everything = off
option SIMPLIFIED_WRITE on
option SIMPLIFIED_READ on
# It isn't necessary to chose fixed or floating point for the APIs because the
# simplified API doesn't need fixed or floating point numbers. It is necessary
# to chose an internal math implementation. The default (because of 'everything
# = off') is fixed point - turn the floating point implementation on if you have
# hardware floating point or prefer your software floating point implementation.
option FLOATING_ARITHMETIC on
# This is not strictly necessary, but without it the message strings in the API
# will not be filled in
option ERROR_TEXT on
# Switching these options on enables the 'AFIRST' and 'BGR' formats - you don't
# need this if you don't use them, they just allow the in-memory layout to be
# changed to match common hardware formats.
option SIMPLIFIED_READ_AFIRST on
option SIMPLIFIED_READ_BGR on
option SIMPLIFIED_WRITE_AFIRST on
option SIMPLIFIED_WRITE_BGR on

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# write.dfa
# Build time configuration of libpng
#
# Author: John Bowler
# Copyright: (c) John Bowler, 2013
# Usage rights:
# To the extent possible under law, the author has waived all copyright and
# related or neighboring rights to this work. This work is published from:
# United States.
#
# Build libpng with no read support and minimal write support.
#
everything = off
# Switch on the write code - this makes a minimalist encoder
option WRITE on
# Choose fixed or floating point APIs and arithmetic. The choices are
# independent but normally they will match. It is typically better to use the
# floating point if you have floating point hardware. If you don't know, or
# (perhaps) to make libpng smaller used fixed point throughout.
#Fixed point:
#option FIXED_POINT on
#option FLOATING_ARITHMETIC off
#Floating point:
option FLOATING_POINT on
option FLOATING_ARITHMETIC on
# Basic error handling, IO and user memory support. The latter allows the
# application program to provide its own implementations of 'malloc' and 'free'.
option SETJMP on
option STDIO on
option USER_MEM on
# Everything else is optional. Unlike the read code in libpng the write code
# does not need to deal with arbitrary formats, so only add support for things
# you really do write! For example you might only write sRGB images, sometimes
# with transparency and never write 16 bit images, so:
option WRITE_sRGB on
option WRITE_tRNS on
#option WRITE_16BIT off (this is the default with 'everything = off')

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This directory (contrib/examples) contains examples of libpng usage.
NO COPYRIGHT RIGHTS ARE CLAIMED TO ANY OF THE FILES IN THIS DIRECTORY.
To the extent possible under law, the authors have waived all copyright and
related or neighboring rights to this work. This work is published from:
United States.
The files may be used freely in any way. The intention is that appropriate
parts of the files be used in other libpng-using programs without any need for
the authors of the using code to seek copyright or license from the original
authors.
The source code and comments in this directory are the original work of the
people named below. No other person or organization has made contributions to
the work in this directory.
ORIGINAL AUTHORS
The following people have contributed to the code in this directory. None
of the people below claim any rights with regard to the contents of this
directory.
John Bowler <jbowler@acm.org>

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/*- iccfrompng
*
* COPYRIGHT: Written by John Cunningham Bowler, 2011.
* To the extent possible under law, the author has waived all copyright and
* related or neighboring rights to this work. This work is published from:
* United States.
*
* Extract any icc profiles found in the given PNG files. This is a simple
* example of a program that extracts information from the header of a PNG file
* without processing the image. Notice that some header information may occur
* after the image data. Textual data and comments are an example; the approach
* in this file won't work reliably for such data because it only looks for the
* information in the section of the file that preceeds the image data.
*
* Compile and link against libpng and zlib, plus anything else required on the
* system you use.
*
* To use supply a list of PNG files containing iCCP chunks, the chunks will be
* extracted to a similarly named file with the extension replaced by 'icc',
* which will be overwritten without warning.
*/
#include <stdlib.h>
#include <setjmp.h>
#include <string.h>
#include <stdio.h>
#include <png.h>
static int verbose = 1;
static png_byte no_profile[] = "no profile";
static png_bytep
extract(FILE *fp, png_uint_32 *proflen)
{
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
png_infop info_ptr = NULL;
png_bytep result = NULL;
/* Initialize for error or no profile: */
*proflen = 0;
if (png_ptr == NULL)
{
fprintf(stderr, "iccfrompng: version library mismatch?\n");
return 0;
}
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 0;
}
png_init_io(png_ptr, fp);
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
png_error(png_ptr, "OOM allocating info structure");
png_read_info(png_ptr, info_ptr);
{
png_charp name;
int compression_type;
png_bytep profile;
if (png_get_iCCP(png_ptr, info_ptr, &name, &compression_type, &profile,
proflen) & PNG_INFO_iCCP)
{
result = malloc(*proflen);
if (result != NULL)
memcpy(result, profile, *proflen);
else
png_error(png_ptr, "OOM allocating profile buffer");
}
else
result = no_profile;
}
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return result;
}
static int
extract_one_file(const char *filename)
{
int result = 0;
FILE *fp = fopen(filename, "rb");
if (fp != NULL)
{
png_uint_32 proflen = 0;
png_bytep profile = extract(fp, &proflen);
if (profile != NULL && profile != no_profile)
{
size_t len;
char *output;
{
const char *ep = strrchr(filename, '.');
if (ep != NULL)
len = ep-filename;
else
len = strlen(filename);
}
output = malloc(len + 5);
if (output != NULL)
{
FILE *of;
memcpy(output, filename, len);
strcpy(output+len, ".icc");
of = fopen(output, "wb");
if (of != NULL)
{
if (fwrite(profile, proflen, 1, of) == 1 &&
fflush(of) == 0 &&
fclose(of) == 0)
{
if (verbose)
printf("%s -> %s\n", filename, output);
/* Success return */
result = 1;
}
else
{
fprintf(stderr, "%s: error writing profile\n", output);
if (remove(output))
fprintf(stderr, "%s: could not remove file\n", output);
}
}
else
fprintf(stderr, "%s: failed to open output file\n", output);
free(output);
}
else
fprintf(stderr, "%s: OOM allocating string!\n", filename);
free(profile);
}
else if (verbose && profile == no_profile)
printf("%s has no profile\n", filename);
}
else
fprintf(stderr, "%s: could not open file\n", filename);
return result;
}
int
main(int argc, char **argv)
{
int i;
int extracted = 0;
for (i=1; i<argc; ++i)
{
if (strcmp(argv[i], "-q") == 0)
verbose = 0;
else if (extract_one_file(argv[i]))
extracted = 1;
}
/* Exit code is true if any extract succeeds */
return extracted == 0;
}

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/*- pngpixel
*
* COPYRIGHT: Written by John Cunningham Bowler, 2011.
* To the extent possible under law, the author has waived all copyright and
* related or neighboring rights to this work. This work is published from:
* United States.
*
* Read a single pixel value from a PNG file.
*
* This code illustrates basic 'by-row' reading of a PNG file using libpng.
* Rows are read until a particular pixel is found; the value of this pixel is
* then printed on stdout.
*
* The code illustrates how to do this on interlaced as well as non-interlaced
* images. Normally you would call png_set_interlace_handling() to have libpng
* deal with the interlace for you, but that obliges you to buffer half of the
* image to assemble the interlaced rows. In this code
* png_set_interlace_handling() is not called and, instead, the code handles the
* interlace passes directly looking for the required pixel.
*/
#include <stdlib.h>
#include <stdio.h>
#include <setjmp.h> /* required for error handling */
/* Normally use <png.h> here to get the installed libpng, but this is done to
* ensure the code picks up the local libpng implementation:
*/
#include "../../png.h"
/* Return component 'c' of pixel 'x' from the given row. */
static unsigned int
component(png_const_bytep row, png_uint_32 x, unsigned int c,
unsigned int bit_depth, unsigned int channels)
{
/* PNG images can be up to 2^31 pixels wide, but this means they can be up to
* 2^37 bits wide (for a 64-bit pixel - the largest possible) and hence 2^34
* bytes wide. Since the row fitted into memory, however, the following must
* work:
*/
png_uint_32 bit_offset_hi = bit_depth * ((x >> 6) * channels);
png_uint_32 bit_offset_lo = bit_depth * ((x & 0x3f) * channels + c);
row = (png_const_bytep)(((PNG_CONST png_byte (*)[8])row) + bit_offset_hi);
row += bit_offset_lo >> 3;
bit_offset_lo &= 0x07;
/* PNG pixels are packed into bytes to put the first pixel in the highest
* bits of the byte and into two bytes for 16-bit values with the high 8 bits
* first, so:
*/
switch (bit_depth)
{
case 1: return (row[0] >> (7-bit_offset_lo)) & 0x01;
case 2: return (row[0] >> (6-bit_offset_lo)) & 0x03;
case 4: return (row[0] >> (4-bit_offset_lo)) & 0x0f;
case 8: return row[0];
case 16: return (row[0] << 8) + row[1];
default:
/* This should never happen; it indicates a bug in this program or in
* libpng itself:
*/
fprintf(stderr, "pngpixel: invalid bit depth %u\n", bit_depth);
exit(1);
}
}
/* Print a pixel from a row returned by libpng; determine the row format, find
* the pixel, and print the relevant information to stdout.
*/
static void
print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row,
png_uint_32 x)
{
PNG_CONST unsigned int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
switch (png_get_color_type(png_ptr, info_ptr))
{
case PNG_COLOR_TYPE_GRAY:
printf("GRAY %u\n", component(row, x, 0, bit_depth, 1));
return;
/* The palette case is slightly more difficult - the palette and, if
* present, the tRNS ('transparency', though the values are really
* opacity) data must be read to give the full picture:
*/
case PNG_COLOR_TYPE_PALETTE:
{
PNG_CONST unsigned int index = component(row, x, 0, bit_depth, 1);
png_colorp palette = NULL;
int num_palette = 0;
if ((png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette) &
PNG_INFO_PLTE) && num_palette > 0 && palette != NULL)
{
png_bytep trans_alpha = NULL;
int num_trans = 0;
if ((png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans,
NULL) & PNG_INFO_tRNS) && num_trans > 0 &&
trans_alpha != NULL)
printf("INDEXED %u = %d %d %d %d\n", index,
palette[index].red, palette[index].green,
palette[index].blue,
index < num_trans ? trans_alpha[index] : 255);
else /* no transparency */
printf("INDEXED %u = %d %d %d\n", index,
palette[index].red, palette[index].green,
palette[index].blue);
}
else
printf("INDEXED %u = invalid index\n", index);
}
return;
case PNG_COLOR_TYPE_RGB:
printf("RGB %u %u %u\n", component(row, x, 0, bit_depth, 3),
component(row, x, 1, bit_depth, 3),
component(row, x, 2, bit_depth, 3));
return;
case PNG_COLOR_TYPE_GRAY_ALPHA:
printf("GRAY+ALPHA %u %u\n", component(row, x, 0, bit_depth, 2),
component(row, x, 1, bit_depth, 2));
return;
case PNG_COLOR_TYPE_RGB_ALPHA:
printf("RGBA %u %u %u %u\n", component(row, x, 0, bit_depth, 4),
component(row, x, 1, bit_depth, 4),
component(row, x, 2, bit_depth, 4),
component(row, x, 3, bit_depth, 4));
return;
default:
png_error(png_ptr, "pngpixel: invalid color type");
}
}
int main(int argc, const char **argv)
{
/* This program uses the default, <setjmp.h> based, libpng error handling
* mechanism, therefore any local variable that exists before the call to
* setjmp and is changed after the call to setjmp returns successfully must
* be declared with 'volatile' to ensure that their values don't get
* destroyed by longjmp:
*/
volatile int result = 1/*fail*/;
if (argc == 4)
{
long x = atol(argv[1]);
long y = atol(argv[2]);
FILE *f = fopen(argv[3], "rb");
volatile png_bytep row = NULL;
if (f != NULL)
{
/* libpng requires a callback function for handling errors; this
* callback must not return. The default callback function uses a
* stored <setjmp.h> style jmp_buf which is held in a png_struct and
* writes error messages to stderr. Creating the png_struct is a
* little tricky; just copy the following code.
*/
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr != NULL)
{
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr != NULL)
{
/* Declare stack variables to hold pointers to locally allocated
* data.
*/
/* Initialize the error control buffer: */
if (setjmp(png_jmpbuf(png_ptr)) == 0)
{
png_uint_32 width, height;
int bit_depth, color_type, interlace_method,
compression_method, filter_method;
png_bytep row_tmp;
/* Now associate the recently opened (FILE*) with the default
* libpng initialization functions. Sometimes libpng is
* compiled without stdio support (it can be difficult to do
* in some environments); in that case you will have to write
* your own read callback to read data from the (FILE*).
*/
png_init_io(png_ptr, f);
/* And read the first part of the PNG file - the header and
* all the information up to the first pixel.
*/
png_read_info(png_ptr, info_ptr);
/* This fills in enough information to tell us the width of
* each row in bytes, allocate the appropriate amount of
* space. In this case png_malloc is used - it will not
* return if memory isn't available.
*/
row = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
info_ptr));
/* To avoid the overhead of using a volatile auto copy row_tmp
* to a local here - just use row for the png_free below.
*/
row_tmp = row;
/* All the information we need is in the header is returned by
* png_get_IHDR, if this fails we can now use 'png_error' to
* signal the error and return control to the setjmp above.
*/
if (png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_method,
&compression_method, &filter_method))
{
int passes, pass;
/* png_set_interlace_handling returns the number of
* passes required as well as turning on libpng's
* handling, but since we do it ourselves this is
* necessary:
*/
switch (interlace_method)
{
case PNG_INTERLACE_NONE:
passes = 1;
break;
case PNG_INTERLACE_ADAM7:
passes = PNG_INTERLACE_ADAM7_PASSES;
break;
default:
png_error(png_ptr, "pngpixel: unknown interlace");
}
/* Now read the pixels, pass-by-pass, row-by-row: */
png_start_read_image(png_ptr);
for (pass=0; pass<passes; ++pass)
{
png_uint_32 ystart, xstart, ystep, xstep;
png_uint_32 py;
if (interlace_method == PNG_INTERLACE_ADAM7)
{
/* Sometimes the whole pass is empty because the
* image is too narrow or too short. libpng
* expects to be called for each row that is
* present in the pass, so it may be necessary to
* skip the loop below (over py) if the image is
* too narrow.
*/
if (PNG_PASS_COLS(width, pass) == 0)
continue;
/* We need the starting pixel and the offset
* between each pixel in this pass; use the macros
* in png.h:
*/
xstart = PNG_PASS_START_COL(pass);
ystart = PNG_PASS_START_ROW(pass);
xstep = PNG_PASS_COL_OFFSET(pass);
ystep = PNG_PASS_ROW_OFFSET(pass);
}
else
{
ystart = xstart = 0;
ystep = xstep = 1;
}
/* To find the pixel, loop over 'py' for each pass
* reading a row and then checking to see if it
* contains the pixel.
*/
for (py = ystart; py < height; py += ystep)
{
png_uint_32 px, ppx;
/* png_read_row takes two pointers. When libpng
* handles the interlace the first is filled in
* pixel-by-pixel, and the second receives the same
* pixels but they are replicated across the
* unwritten pixels so far for each pass. When we
* do the interlace, however, they just contain
* the pixels from the interlace pass - giving
* both is wasteful and pointless, so we pass a
* NULL pointer.
*/
png_read_row(png_ptr, row_tmp, NULL);
/* Now find the pixel if it is in this row; there
* are, of course, much better ways of doing this
* than using a for loop:
*/
if (y == py) for (px = xstart, ppx = 0;
px < width; px += xstep, ++ppx) if (x == px)
{
/* 'ppx' is the index of the pixel in the row
* buffer.
*/
print_pixel(png_ptr, info_ptr, row_tmp, ppx);
/* Now terminate the loops early - we have
* found and handled the required data.
*/
goto pass_loop_end;
} /* x loop */
} /* y loop */
} /* pass loop */
/* Finally free the temporary buffer: */
pass_loop_end:
row = NULL;
png_free(png_ptr, row_tmp);
}
else
png_error(png_ptr, "pngpixel: png_get_IHDR failed");
}
else
{
/* Else libpng has raised an error. An error message has
* already been output, so it is only necessary to clean up
* locally allocated data:
*/
if (row != NULL)
{
/* The default implementation of png_free never errors out
* (it just crashes if something goes wrong), but the safe
* way of using it is still to clear 'row' before calling
* png_free:
*/
png_bytep row_tmp = row;
row = NULL;
png_free(png_ptr, row_tmp);
}
}
png_destroy_info_struct(png_ptr, &info_ptr);
}
else
fprintf(stderr, "pngpixel: out of memory allocating png_info\n");
png_destroy_read_struct(&png_ptr, NULL, NULL);
}
else
fprintf(stderr, "pngpixel: out of memory allocating png_struct\n");
}
else
fprintf(stderr, "pngpixel: %s: could not open file\n", argv[3]);
}
else
/* Wrong number of arguments */
fprintf(stderr, "pngpixel: usage: pngpixel x y png-file\n");
return result;
}

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/*- pngtopng
*
* COPYRIGHT: Written by John Cunningham Bowler, 2011.
* To the extent possible under law, the author has waived all copyright and
* related or neighboring rights to this work. This work is published from:
* United States.
*
* Read a PNG and write it out in a fixed format, using the 'simplified API'
* that was introduced in libpng-1.6.0.
*
* This sample code is just the code from the top of 'example.c' with some error
* handling added. See example.c for more comments.
*/
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
/* Normally use <png.h> here to get the installed libpng, but this is done to
* ensure the code picks up the local libpng implementation:
*/
#include "../../png.h"
int main(int argc, const char **argv)
{
int result = 1;
if (argc == 3)
{
png_image image;
/* Only the image structure version number needs to be set. */
memset(&image, 0, sizeof image);
image.version = PNG_IMAGE_VERSION;
if (png_image_begin_read_from_file(&image, argv[1]))
{
png_bytep buffer;
/* Change this to try different formats! If you set a colormap format
* then you must also supply a colormap below.
*/
image.format = PNG_FORMAT_RGBA;
buffer = malloc(PNG_IMAGE_SIZE(image));
if (buffer != NULL)
{
if (png_image_finish_read(&image, NULL/*background*/, buffer,
0/*row_stride*/, NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP */))
{
if (png_image_write_to_file(&image, argv[2],
0/*convert_to_8bit*/, buffer, 0/*row_stride*/,
NULL/*colormap*/))
result = 0;
else
fprintf(stderr, "pngtopng: write %s: %s\n", argv[2],
image.message);
free(buffer);
}
else
{
fprintf(stderr, "pngtopng: read %s: %s\n", argv[1],
image.message);
/* This is the only place where a 'free' is required; libpng does
* the cleanup on error and success, but in this case we couldn't
* complete the read because of running out of memory.
*/
png_image_free(&image);
}
}
else
fprintf(stderr, "pngtopng: out of memory: %lu bytes\n",
(unsigned long)PNG_IMAGE_SIZE(image));
}
else
/* Failed to read the first argument: */
fprintf(stderr, "pngtopng: %s: %s\n", argv[1], image.message);
}
else
/* Wrong number of arguments */
fprintf(stderr, "pngtopng: usage: pngtopng input-file output-file\n");
return result;
}

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
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For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
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We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
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Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
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Finally, any free program is threatened constantly by software
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The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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exercise the right to control the distribution of derivative or
collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
b) Accompany it with a written offer, valid for at least three
years, to give any third party, for a charge no more than your
cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer
to distribute corresponding source code. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form with such
an offer, in accord with Subsection b above.)
The source code for a work means the preferred form of the work for
making modifications to it. For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable. However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.
If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.
4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.
5. You are not required to accept this License, since you have not
signed it. However, nothing else grants you permission to modify or
distribute the Program or its derivative works. These actions are
prohibited by law if you do not accept this License. Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.
6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
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7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices. Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation. If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.
10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission. For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this. Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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---------------------------------------------------------------------------
Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------

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# Sample makefile for rpng-win / rpng2-win / wpng using mingw32-gcc and make.
# Greg Roelofs
# Last modified: 2 June 2007
#
# The programs built by this makefile are described in the book,
# "PNG: The Definitive Guide," by Greg Roelofs (O'Reilly and
# Associates, 1999). Go buy a copy, eh? Well, OK, it's not
# generally for sale anymore, but it's the thought that counts,
# right? (Hint: http://www.libpng.org/pub/png/book/ )
#
# Invoke this makefile from a DOS-prompt window via:
#
# make -f Makefile.mingw32
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are in subdirectories at the same level as the current subdirectory
# (as indicated by the PNGDIR and ZDIR macros below). It makes no assumptions
# at all about the mingw32 installation tree (W32DIR). Edit as appropriate.
#
# Note that the names of the dynamic and static libpng and zlib libraries
# used below may change in later releases of the libraries. This makefile
# builds both statically and dynamically linked executables by default.
# (You need only one set, but for testing it can be handy to have both.)
# macros --------------------------------------------------------------------
#PNGDIR = ../..# for libpng-x.y.z/contrib/gregbook builds
PNGDIR = ../libpng-win32
PNGINC = -I$(PNGDIR)
PNGLIBd = $(PNGDIR)/libpng.dll.a # dynamically linked
PNGLIBs = $(PNGDIR)/libpng.a # statically linked, local libpng
#ZDIR = ../../../zlib-win32# for libpng-x.y.z/contrib/gregbook builds
ZDIR = ../zlib-win32
ZINC = -I$(ZDIR)
ZLIBd = $(ZDIR)/libzdll.a
ZLIBs = $(ZDIR)/libz.a
# change this to be the path where mingw32 installs its stuff:
W32DIR =
#W32DIR = /usr/local/cross-tools/i386-mingw32msvc
W32INC = -I$(W32DIR)/include
W32LIB = $(W32DIR)/lib/libuser32.a $(W32DIR)/lib/libgdi32.a
CC = gcc
#CC = i386-mingw32msvc-gcc # e.g., Linux -> Win32 cross-compilation
LD = $(CC)
RM = rm -f
CPPFLAGS = $(INCS)
CFLAGS = -O -Wall $(MINGW_CCFLAGS)
# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
# [-ansi, -pedantic and -W can also be used]
LDFLAGS = $(MINGW_LDFLAGS)
O = .o
E = .exe
INCS = $(PNGINC) $(ZINC) $(W32INC)
RLIBSd = $(PNGLIBd) $(ZLIBd) $(W32LIB) -lm
RLIBSs = $(PNGLIBs) $(ZLIBs) $(W32LIB) -lm
WLIBSd = $(PNGLIBd) $(ZLIBd)
WLIBSs = $(PNGLIBs) $(ZLIBs)
RPNG = rpng-win
RPNG2 = rpng2-win
WPNG = wpng
ROBJSd = $(RPNG)$(O) readpng.pic$(O)
ROBJS2d = $(RPNG2)$(O) readpng2.pic$(O)
WOBJSd = $(WPNG)$(O) writepng.pic$(O)
RPNGs = $(RPNG)-static
RPNG2s = $(RPNG2)-static
WPNGs = $(WPNG)-static
ROBJSs = $(RPNG)$(O) readpng$(O)
ROBJS2s = $(RPNG2)$(O) readpng2$(O)
WOBJSs = $(WPNG)$(O) writepng$(O)
STATIC_EXES = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
%.pic$(O): %.c
$(CC) -c $(CPPFLAGS) $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<
# dependencies --------------------------------------------------------------
all: $(EXES)
$(RPNGs)$(E): $(ROBJSs)
$(LD) $(LDFLAGS) -o $@ $(ROBJSs) $(RLIBSs)
$(RPNG)$(E): $(ROBJSd)
$(LD) $(LDFLAGS) -o $@ $(ROBJSd) $(RLIBSd)
$(RPNG2s)$(E): $(ROBJS2s)
$(LD) $(LDFLAGS) -o $@ $(ROBJS2s) $(RLIBSs)
$(RPNG2)$(E): $(ROBJS2d)
$(LD) $(LDFLAGS) -o $@ $(ROBJS2d) $(RLIBSd)
$(WPNGs)$(E): $(WOBJSs)
$(LD) $(LDFLAGS) -o $@ $(WOBJSs) $(WLIBSs)
$(WPNG)$(E): $(WOBJSd)
$(LD) $(LDFLAGS) -o $@ $(WOBJSd) $(WLIBSd)
$(RPNG)$(O): $(RPNG).c readpng.h
$(RPNG2)$(O): $(RPNG2).c readpng2.h
$(WPNG)$(O): $(WPNG).c writepng.h
readpng$(O) readpng.pic$(O): readpng.c readpng.h
readpng2$(O) readpng2.pic$(O): readpng2.c readpng2.h
writepng$(O) writepng.pic$(O): writepng.c writepng.h
# maintenance ---------------------------------------------------------------
clean:
$(RM) $(EXES)
$(RM) $(ROBJSs) $(ROBJS2s) $(WOBJSs)
$(RM) $(ROBJSd) $(ROBJS2d) $(WOBJSd)

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# Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.
# Greg Roelofs
# Last modified: 7 March 2002
#
# The programs built by this makefile are described in the book,
# "PNG: The Definitive Guide," by Greg Roelofs (O'Reilly and
# Associates, 1999). Go buy a copy, eh? Buy some for friends
# and family, too. (Not that this is a blatant plug or anything.)
#
# Invoke this makefile from a shell prompt in the usual way; for example:
#
# make -f Makefile.sgi
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are both installed in /usr/local/{include,lib} (as indicated by the
# PNG* and Z* macros below). Edit as appropriate--choose only ONE each of
# the PNGINC, PNGLIB, ZINC and ZLIB lines.
#
# This makefile builds dynamically linked executables (against libpng and zlib,
# that is), but that can be changed by uncommenting the appropriate PNGLIB and
# ZLIB lines.
# macros --------------------------------------------------------------------
PNGINC = -I/usr/local/include/libpng16
PNGLIB = -L/usr/local/lib -lpng16 # dynamically linked against libpng
#PNGLIB = /usr/local/lib/libpng16.a # statically linked against libpng
# or:
#PNGINC = -I../..
#PNGLIB = -L../.. -lpng
#PNGLIB = ../../libpng.a
ZINC = -I/usr/local/include
ZLIB = -L/usr/local/lib -lz # dynamically linked against zlib
#ZLIB = /usr/local/lib/libz.a # statically linked against zlib
#ZINC = -I../zlib
#ZLIB = -L../zlib -lz
#ZLIB = ../../../zlib/libz.a
XINC = -I/usr/include/X11 # old-style, stock X distributions
XLIB = -L/usr/lib/X11 -lX11
#XINC = -I/usr/openwin/include # Sun workstations (OpenWindows)
#XLIB = -L/usr/openwin/lib -lX11
#XINC = -I/usr/X11R6/include # new X distributions (XFree86, etc.)
#XLIB = -L/usr/X11R6/lib -lX11
INCS = $(PNGINC) $(ZINC) $(XINC)
RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
WLIBS = $(PNGLIB) $(ZLIB)
CC = cc
LD = cc
RM = rm -f
# ABI must be the same as that used to build libpng.
ABI =
CPPFLAGS =
CFLAGS = $(ABI) -O -fullwarn $(INCS)
LDFLAGS = $(ABI)
O = .o
E =
RPNG = rpng-x
RPNG2 = rpng2-x
WPNG = wpng
ROBJS = $(RPNG)$(O) readpng$(O)
ROBJS2 = $(RPNG2)$(O) readpng2$(O)
WOBJS = $(WPNG)$(O) writepng$(O)
EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies --------------------------------------------------------------
all: $(EXES)
$(RPNG)$(E): $(ROBJS)
$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
$(RPNG2)$(E): $(ROBJS2)
$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
$(WPNG)$(E): $(WOBJS)
$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
$(RPNG)$(O): $(RPNG).c readpng.h
$(RPNG2)$(O): $(RPNG2).c readpng2.h
$(WPNG)$(O): $(WPNG).c writepng.h
readpng$(O): readpng.c readpng.h
readpng2$(O): readpng2.c readpng2.h
writepng$(O): writepng.c writepng.h
# maintenance ---------------------------------------------------------------
clean:
$(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

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# Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
# Greg Roelofs
# Last modified: 2 June 2007
#
# The programs built by this makefile are described in the book,
# "PNG: The Definitive Guide," by Greg Roelofs (O'Reilly and
# Associates, 1999). Go buy a copy, eh? Well, OK, it's not
# generally for sale anymore, but it's the thought that counts,
# right? (Hint: http://www.libpng.org/pub/png/book/ )
#
# Invoke this makefile from a shell prompt in the usual way; for example:
#
# make -f Makefile.unx
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are installed in /usr/local/{include,lib} or as otherwise indicated by
# the PNG* and Z* macros below. Edit as appropriate--choose only ONE each of
# the PNGINC, PNGLIBd, PNGLIBs, ZINC, ZLIBd and ZLIBs lines.
#
# This makefile builds both dynamically and statically linked executables
# (against libpng and zlib, that is), but that can be changed by modifying
# the "EXES =" line. (You need only one set, but for testing it can be handy
# to have both.)
# macros --------------------------------------------------------------------
#PNGDIR = /usr/local/lib
#PNGINC = -I/usr/local/include/libpng16
#PNGLIBd = -L$(PNGDIR) -lpng16 # dynamically linked, installed libpng
#PNGLIBs = $(PNGDIR)/libpng16.a # statically linked, installed libpng
# or:
PNGDIR = ../..# this one is for libpng-x.y.z/contrib/gregbook builds
#PNGDIR = ../libpng
PNGINC = -I$(PNGDIR)
PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng16 # dynamically linked
PNGLIBs = $(PNGDIR)/libpng.a # statically linked, local libpng
ZDIR = /usr/local/lib
#ZDIR = /usr/lib64
ZINC = -I/usr/local/include
ZLIBd = -L$(ZDIR) -lz # dynamically linked against zlib
ZLIBs = $(ZDIR)/libz.a # statically linked against zlib
# or:
#ZDIR = ../zlib
#ZINC = -I$(ZDIR)
#ZLIBd = -Wl,-rpath,$(ZDIR) -L$(ZDIR) -lz # -rpath allows in-place testing
#ZLIBs = $(ZDIR)/libz.a
#XINC = -I/usr/include # old-style, stock X distributions
#XLIB = -L/usr/lib/X11 -lX11 # (including SGI IRIX)
#XINC = -I/usr/openwin/include # Sun workstations (OpenWindows)
#XLIB = -L/usr/openwin/lib -lX11
XINC = -I/usr/X11R6/include # new X distributions (X.org, etc.)
XLIB = -L/usr/X11R6/lib -lX11
#XLIB = -L/usr/X11R6/lib64 -lX11 # e.g., Red Hat on AMD64
INCS = $(PNGINC) $(ZINC) $(XINC)
RLIBSd = $(PNGLIBd) $(ZLIBd) $(XLIB) -lm
RLIBSs = $(PNGLIBs) $(ZLIBs) $(XLIB) -lm
WLIBSd = $(PNGLIBd) $(ZLIBd) -lm
WLIBSs = $(PNGLIBs) $(ZLIBs) -lm
CC = gcc
LD = gcc
RM = rm -f
CPPFLAGS = $(INCS) -DFEATURE_LOOP
CFLAGS = -O -Wall
#CFLAGS = -O -W -Wall -Wextra -pedantic -ansi
# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
# [-ansi, -pedantic, -Wextra, and -W can also be used]
LDFLAGS =
O = .o
E =
RPNG = rpng-x
RPNG2 = rpng2-x
WPNG = wpng
RPNGs = $(RPNG)-static
RPNG2s = $(RPNG2)-static
WPNGs = $(WPNG)-static
ROBJS = $(RPNG)$(O) readpng$(O)
ROBJS2 = $(RPNG2)$(O) readpng2$(O)
WOBJS = $(WPNG)$(O) writepng$(O)
STATIC_EXES = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies --------------------------------------------------------------
all: $(EXES)
$(RPNGs)$(E): $(ROBJS)
$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSs)
$(RPNG)$(E): $(ROBJS)
$(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSd)
$(RPNG2s)$(E): $(ROBJS2)
$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSs)
$(RPNG2)$(E): $(ROBJS2)
$(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSd)
$(WPNGs)$(E): $(WOBJS)
$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSs)
$(WPNG)$(E): $(WOBJS)
$(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSd)
$(RPNG)$(O): $(RPNG).c readpng.h
$(RPNG2)$(O): $(RPNG2).c readpng2.h
$(WPNG)$(O): $(WPNG).c writepng.h
readpng$(O): readpng.c readpng.h
readpng2$(O): readpng2.c readpng2.h
writepng$(O): writepng.c writepng.h
# maintenance ---------------------------------------------------------------
clean:
$(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

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# Sample makefile for rpng-win / rpng2-win / wpng using MSVC and NMAKE.
# Greg Roelofs
# Last modified: 2 June 2007
#
# The programs built by this makefile are described in the book,
# "PNG: The Definitive Guide," by Greg Roelofs (O'Reilly and
# Associates, 1999). Go buy a copy, eh? Well, OK, it's not
# generally for sale anymore, but it's the thought that counts,
# right? (Hint: http://www.libpng.org/pub/png/book/ )
#
# Invoke this makefile from a DOS prompt window via:
#
# %devstudio%\vc\bin\vcvars32.bat
# nmake -nologo -f Makefile.w32
#
# where %devstudio% is the installation directory for MSVC / DevStudio. If
# you get "environment out of space" errors, create a desktop shortcut with
# "c:\windows\command.com /e:4096" as the program command line and set the
# working directory to this directory. Then double-click to open the new
# DOS-prompt window with a bigger environment and retry the commands above.
#
# This makefile assumes libpng and zlib have already been built or downloaded
# and are in subdirectories at the same level as the current subdirectory
# (as indicated by the PNGPATH and ZPATH macros below). Edit as appropriate.
#
# Note that the names of the dynamic and static libpng and zlib libraries
# used below may change in later releases of the libraries. This makefile
# builds statically linked executables, but that can be changed by uncom-
# menting the appropriate PNGLIB and ZLIB lines.
!include <ntwin32.mak>
# macros --------------------------------------------------------------------
PNGPATH = ../libpng
PNGINC = -I$(PNGPATH)
#PNGLIB = $(PNGPATH)/pngdll.lib
PNGLIB = $(PNGPATH)/libpng.lib
ZPATH = ../zlib
ZINC = -I$(ZPATH)
#ZLIB = $(ZPATH)/zlibdll.lib
ZLIB = $(ZPATH)/zlibstat.lib
WINLIBS = -defaultlib:user32.lib gdi32.lib
# ["real" apps may also need comctl32.lib, comdlg32.lib, winmm.lib, etc.]
INCS = $(PNGINC) $(ZINC)
RLIBS = $(PNGLIB) $(ZLIB) $(WINLIBS)
WLIBS = $(PNGLIB) $(ZLIB)
CC = cl
LD = link
RM = del
CPPFLAGS = $(INCS)
CFLAGS = -nologo -O -W3 $(cvars)
# [note that -W3 is an MSVC-specific compilation flag ("all warnings on")]
# [see %devstudio%\vc\include\win32.mak for cvars macro definition]
O = .obj
E = .exe
RLDFLAGS = -nologo -subsystem:windows
WLDFLAGS = -nologo
RPNG = rpng-win
RPNG2 = rpng2-win
WPNG = wpng
ROBJS = $(RPNG)$(O) readpng$(O)
ROBJS2 = $(RPNG2)$(O) readpng2$(O)
WOBJS = $(WPNG)$(O) writepng$(O)
EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies --------------------------------------------------------------
all: $(EXES)
$(RPNG)$(E): $(ROBJS)
$(LD) $(RLDFLAGS) -out:$@ $(ROBJS) $(RLIBS)
$(RPNG2)$(E): $(ROBJS2)
$(LD) $(RLDFLAGS) -out:$@ $(ROBJS2) $(RLIBS)
$(WPNG)$(E): $(WOBJS)
$(LD) $(WLDFLAGS) -out:$@ $(WOBJS) $(WLIBS)
$(RPNG)$(O): $(RPNG).c readpng.h
$(RPNG2)$(O): $(RPNG2).c readpng2.h
$(WPNG)$(O): $(WPNG).c writepng.h
readpng$(O): readpng.c readpng.h
readpng2$(O): readpng2.c readpng2.h
writepng$(O): writepng.c writepng.h
# maintenance ---------------------------------------------------------------
clean:
# ideally we could just do this:
# $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)
# ...but the Windows "DEL" command is none too bright, so:
$(RM) r*$(E)
$(RM) w*$(E)
$(RM) r*$(O)
$(RM) w*$(O)

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===========================
PNG: The Definitive Guide
===========================
Source Code
Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
cross-platform demo programs that show how to use the libpng reference
library: rpng, rpng2 and wpng. rpng and rpng2 are viewers; the first is
a very simple example that that shows how a standard file-viewer might use
libpng, while the second is designed to process streaming data and shows
how a web browser might be written. wpng is a simple command-line program
that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
of PBMPLUS/NetPBM) and converts them to PNG.
The source code for all three demo programs currently compiles under
Unix, OpenVMS, and 32-bit Windows. (Special thanks to Martin Zinser,
zinser@decus.de, for making the necessary changes for OpenVMS and for
providing an appropriate build script.) Build instructions can be found
below.
Files:
README this file
LICENSE terms of distribution and reuse (BSD-like or GNU GPL)
COPYING GNU General Public License (GPL)
Makefile.unx Unix makefile
Makefile.w32 Windows (MSVC) makefile
makevms.com OpenVMS build script
rpng-win.c Windows front end for the basic viewer
rpng-x.c X Window System (Unix, OpenVMS) front end
readpng.c generic back end for the basic viewer
readpng.h header file for the basic viewer
rpng2-win.c Windows front end for the progressive viewer
rpng2-x.c X front end for the progressive viewer
readpng2.c generic back end for the progressive viewer
readpng2.h header file for the progressive viewer
wpng.c generic (text) front end for the converter
writepng.c generic back end for the converter
writepng.h header file for the converter
toucan.png transparent PNG for testing (by Stefan Schneider)
Note that, although the programs are designed to be functional, their
primary purpose is to illustrate how to use libpng to add PNG support to
other programs. As such, their user interfaces are crude and definitely
are not intended for everyday use.
Please see http://www.libpng.org/pub/png/pngbook.html for further infor-
mation and links to the latest version of the source code, and Chapters
13-15 of the book for detailed discussion of the three programs.
Greg Roelofs
http://pobox.com/~newt/greg_contact.html
16 March 2008
BUILD INSTRUCTIONS
- Prerequisites (in order of compilation):
- zlib http://zlib.net/
- libpng http://www.libpng.org/pub/png/libpng.html
- pngbook http://www.libpng.org/pub/png/book/sources.html
The pngbook demo programs are explicitly designed to demonstrate proper
coding techniques for using the libpng reference library. As a result,
you need to download and build both zlib (on which libpng depends) and
libpng. A common build setup is to place the zlib, libpng and pngbook
subdirectory trees ("folders") in the same parent directory. Then the
libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
and similarly for the pngbook build.
Note that all three packages are designed to be built from a command
line by default; those who wish to use a graphical or other integrated
development environments are on their own.
- Unix:
Unpack the latest pngbook sources (which should correspond to this
README file) into a directory and change into that directory.
Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
appropriately (possibly also the X* variables if necessary).
make
There is no "install" target, so copy the three executables somewhere
in your path or run them from the current directory. All three will
print a basic usage screen when run without any command-line arguments;
see the book for more details.
- Windows:
Unpack the latest pngbook sources (which should correspond to this
README file) into a folder, open a "DOS shell" or "command prompt"
or equivalent command-line window, and cd into the folder where you
unpacked the source code.
For MSVC, set up the necessary environment variables by invoking
%devstudio%\vc\bin\vcvars32.bat
where where %devstudio% is the installation directory for MSVC /
DevStudio. If you get "environment out of space" errors under 95/98,
create a desktop shortcut with "c:\windows\command.com /e:4096" as
the program command line and set the working directory to the pngbook
directory. Then double-click to open the new DOS-prompt window with
a bigger environment and retry the commands above.
Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
appropriately (possibly also the "INC" and "LIB" variables if needed).
Note that the names of the dynamic and static libpng and zlib libraries
used in the makefile may change in later releases of the libraries.
Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
This makefile therefore builds statically linked executables, but if
the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
and ZLIB lines will build dynamically linked executables instead.
Do the build by typing
nmake
The result should be three executables: rpng-win.exe, rpng2-win.exe,
and wpng.exe. Copy them somewhere in your PATH or run them from the
current folder. Like the Unix versions, the two windowed programs
(rpng and rpng2) now display a usage screen in a console window when
invoked without command-line arguments; this is new behavior as of
the June 2001 release. Note that the programs use the Unix-style "-"
character to specify options, instead of the more common DOS/Windows
"/" character. (For example: "rpng2-win -bgpat 4 foo.png", not
"rpng2-win /bgpat 4 foo.png")
- OpenVMS:
Unpack the pngbook sources into a subdirectory and change into that
subdirectory.
Edit makevms.com appropriately, specifically the zpath and pngpath
variables.
@makevms
To run the programs, they probably first need to be set up as "foreign
symbols," with "disk" and "dir" set appropriately:
$ rpng == "$disk:[dir]rpng-x.exe"
$ rpng2 == "$disk:[dir]rpng2-x.exe"
$ wpng == "$disk:[dir]wpng.exe"
All three will print a basic usage screen when run without any command-
line arguments; see the book for more details. Note that the options
style is Unix-like, i.e., preceded by "-" rather than "/".
RUNNING THE PROGRAMS: (VERY) BRIEF INTRO
rpng is a simple PNG viewer that can display transparent PNGs with a
specified background color; for example,
rpng -bgcolor \#ff0000 toucan.png
would display the image with a red background. rpng2 is a progressive
viewer that simulates a web browser in some respects; it can display
images against either a background color or a dynamically generated
background image. For example:
rpng2 -bgpat 16 toucan.png
wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
format (.pgm or .ppm) to PNG; for example,
wpng -time < toucan-notrans.ppm > toucan-notrans.png
would convert the specified PPM file (using redirection) to PNG, auto-
matically setting the PNG modification-time chunk.
All options can be abbreviated to the shortest unique value; for example,
"-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.

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$!------------------------------------------------------------------------------
$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS
$!
$! Script created by Martin Zinser for libpng; modified by Greg Roelofs
$! for standalone pngbook source distribution.
$!
$!
$! Set locations where zlib and libpng sources live.
$!
$ zpath = ""
$ pngpath = ""
$!
$ if f$search("[---.zlib]zlib.h").nes."" then zpath = "[---.zlib]"
$ if f$search("[--]png.h").nes."" then pngpath = "[--]"
$!
$ if f$search("[-.zlib]zlib.h").nes."" then zpath = "[-.zlib]"
$ if f$search("[-.libpng]png.h").nes."" then pngpath = "[-.libpng]"
$!
$ if zpath .eqs. ""
$ then
$ write sys$output "zlib include not found. Exiting..."
$ exit 2
$ endif
$!
$ if pngpath .eqs. ""
$ then
$ write sys$output "libpng include not found. Exiting..."
$ exit 2
$ endif
$!
$! Look for the compiler used.
$!
$ ccopt="/include=(''zpath',''pngpath')"
$ if f$getsyi("HW_MODEL").ge.1024
$ then
$ ccopt = "/prefix=all"+ccopt
$ comp = "__decc__=1"
$ if f$trnlnm("SYS").eqs."" then define sys sys$library:
$ else
$ if f$search("SYS$SYSTEM:DECC$COMPILER.EXE").eqs.""
$ then
$ if f$trnlnm("SYS").eqs."" then define sys sys$library:
$ if f$search("SYS$SYSTEM:VAXC.EXE").eqs.""
$ then
$ comp = "__gcc__=1"
$ CC :== GCC
$ else
$ comp = "__vaxc__=1"
$ endif
$ else
$ if f$trnlnm("SYS").eqs."" then define sys decc$library_include:
$ ccopt = "/decc/prefix=all"+ccopt
$ comp = "__decc__=1"
$ endif
$ endif
$ open/write lopt lib.opt
$ write lopt "''pngpath'libpng.olb/lib"
$ write lopt "''zpath'libz.olb/lib"
$ close lopt
$ open/write xopt x11.opt
$ write xopt "sys$library:decw$xlibshr.exe/share"
$ close xopt
$!
$! Build 'em.
$!
$ write sys$output "Compiling PNG book programs ..."
$ CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -
readpng.c readpng.h
$ CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -
readpng2.c readpng2.h
$ CALL MAKE writepng.OBJ "cc ''CCOPT' writepng" -
writepng.c writepng.h
$ write sys$output "Building rpng-x..."
$ CALL MAKE rpng-x.OBJ "cc ''CCOPT' rpng-x" -
rpng-x.c readpng.h
$ call make rpng-x.exe -
"LINK rpng-x,readpng,lib.opt/opt,x11.opt/opt" -
rpng-x.obj readpng.obj
$ write sys$output "Building rpng2-x..."
$ CALL MAKE rpng2-x.OBJ "cc ''CCOPT' rpng2-x" -
rpng2-x.c readpng2.h
$ call make rpng2-x.exe -
"LINK rpng2-x,readpng2,lib.opt/opt,x11.opt/opt" -
rpng2-x.obj readpng2.obj
$ write sys$output "Building wpng..."
$ CALL MAKE wpng.OBJ "cc ''CCOPT' wpng" -
wpng.c writepng.h
$ call make wpng.exe -
"LINK wpng,writepng,lib.opt/opt" -
wpng.obj writepng.obj
$ exit
$!
$!
$MAKE: SUBROUTINE !SUBROUTINE TO CHECK DEPENDENCIES
$ V = 'F$Verify(0)
$! P1 = What we are trying to make
$! P2 = Command to make it
$! P3 - P8 What it depends on
$
$ If F$Search(P1) .Eqs. "" Then Goto Makeit
$ Time = F$CvTime(F$File(P1,"RDT"))
$arg=3
$Loop:
$ Argument = P'arg
$ If Argument .Eqs. "" Then Goto Exit
$ El=0
$Loop2:
$ File = F$Element(El," ",Argument)
$ If File .Eqs. " " Then Goto Endl
$ AFile = ""
$Loop3:
$ OFile = AFile
$ AFile = F$Search(File)
$ If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl
$ If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit
$ Goto Loop3
$NextEL:
$ El = El + 1
$ Goto Loop2
$EndL:
$ arg=arg+1
$ If arg .Le. 8 Then Goto Loop
$ Goto Exit
$
$Makeit:
$ VV=F$VERIFY(0)
$ write sys$output P2
$ 'P2
$ VV='F$Verify(VV)
$Exit:
$ If V Then Set Verify
$ENDSUBROUTINE

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/*---------------------------------------------------------------------------
rpng - simple PNG display program readpng.c
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h>
#include "png.h" /* libpng header */
#include "readpng.h" /* typedefs, common macros, public prototypes */
/* future versions of libpng will provide this macro: */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
static png_structp png_ptr = NULL;
static png_infop info_ptr = NULL;
png_uint_32 width, height;
int bit_depth, color_type;
uch *image_data = NULL;
void readpng_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
fprintf(stderr, " Compiled with zlib %s; using zlib %s.\n",
ZLIB_VERSION, zlib_version);
}
/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
{
uch sig[8];
/* first do a quick check that the file really is a PNG image; could
* have used slightly more general png_sig_cmp() function instead */
fread(sig, 1, 8, infile);
if (png_sig_cmp(sig, 0, 8))
return 1; /* bad signature */
/* could pass pointers to user-defined error handlers instead of NULLs: */
png_ptr = png_create_read_struct(png_get_libpng_ver(NULL), NULL, NULL,
NULL);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return 4; /* out of memory */
}
/* we could create a second info struct here (end_info), but it's only
* useful if we want to keep pre- and post-IDAT chunk info separated
* (mainly for PNG-aware image editors and converters) */
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
png_init_io(png_ptr, infile);
png_set_sig_bytes(png_ptr, 8); /* we already read the 8 signature bytes */
png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
/* alternatively, could make separate calls to png_get_image_width(),
* etc., but want bit_depth and color_type for later [don't care about
* compression_type and filter_type => NULLs] */
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
*pWidth = width;
*pHeight = height;
/* OK, that's all we need for now; return happy */
return 0;
}
/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
* scales values to 8-bit if necessary */
int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
{
png_color_16p pBackground;
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
return 1;
/* it is not obvious from the libpng documentation, but this function
* takes a pointer to a pointer, and it always returns valid red, green
* and blue values, regardless of color_type: */
png_get_bKGD(png_ptr, info_ptr, &pBackground);
/* however, it always returns the raw bKGD data, regardless of any
* bit-depth transformations, so check depth and adjust if necessary */
if (bit_depth == 16) {
*red = pBackground->red >> 8;
*green = pBackground->green >> 8;
*blue = pBackground->blue >> 8;
} else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
if (bit_depth == 1)
*red = *green = *blue = pBackground->gray? 255 : 0;
else if (bit_depth == 2)
*red = *green = *blue = (255/3) * pBackground->gray;
else /* bit_depth == 4 */
*red = *green = *blue = (255/15) * pBackground->gray;
} else {
*red = (uch)pBackground->red;
*green = (uch)pBackground->green;
*blue = (uch)pBackground->blue;
}
return 0;
}
/* display_exponent == LUT_exponent * CRT_exponent */
uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
{
double gamma;
png_uint_32 i, rowbytes;
png_bytepp row_pointers = NULL;
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(png_jmpbuf(png_ptr))) {
free(image_data);
image_data = NULL;
free(row_pointers);
row_pointers = NULL;
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
/* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
* transparency chunks to full alpha channel; strip 16-bit-per-sample
* images to 8 bits per sample; and convert grayscale to RGB[A] */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
png_set_scale_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
#endif
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
/* unlike the example in the libpng documentation, we have *no* idea where
* this file may have come from--so if it doesn't have a file gamma, don't
* do any correction ("do no harm") */
if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, display_exponent, gamma);
/* all transformations have been registered; now update info_ptr data,
* get rowbytes and channels, and allocate image memory */
png_read_update_info(png_ptr, info_ptr);
*pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
*pChannels = (int)png_get_channels(png_ptr, info_ptr);
if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(image_data);
image_data = NULL;
return NULL;
}
Trace((stderr, "readpng_get_image: channels = %d, rowbytes = %ld, height = %ld\n",
*pChannels, rowbytes, height));
/* set the individual row_pointers to point at the correct offsets */
for (i = 0; i < height; ++i)
row_pointers[i] = image_data + i*rowbytes;
/* now we can go ahead and just read the whole image */
png_read_image(png_ptr, row_pointers);
/* and we're done! (png_read_end() can be omitted if no processing of
* post-IDAT text/time/etc. is desired) */
free(row_pointers);
row_pointers = NULL;
png_read_end(png_ptr, NULL);
return image_data;
}
void readpng_cleanup(int free_image_data)
{
if (free_image_data && image_data) {
free(image_data);
image_data = NULL;
}
if (png_ptr && info_ptr) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
png_ptr = NULL;
info_ptr = NULL;
}
}

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/*---------------------------------------------------------------------------
rpng - simple PNG display program readpng.h
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif
#ifndef MAX
# define MAX(a,b) ((a) > (b)? (a) : (b))
# define MIN(a,b) ((a) < (b)? (a) : (b))
#endif
#ifdef DEBUG
# define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
#else
# define Trace(x) ;
#endif
typedef unsigned char uch;
typedef unsigned short ush;
typedef unsigned long ulg;
/* prototypes for public functions in readpng.c */
void readpng_version_info(void);
int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
uch *readpng_get_image(double display_exponent, int *pChannels,
ulg *pRowbytes);
void readpng_cleanup(int free_image_data);

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/*---------------------------------------------------------------------------
rpng2 - progressive-model PNG display program readpng2.c
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#include <stdlib.h> /* for exit() prototype */
#include <setjmp.h>
#include <zlib.h>
#include "png.h" /* libpng header from the local directory */
#include "readpng2.h" /* typedefs, common macros, public prototypes */
/* local prototypes */
static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr);
static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass);
static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg);
void readpng2_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
fprintf(stderr, " and with zlib %s; using zlib %s.\n",
ZLIB_VERSION, zlib_version);
}
int readpng2_check_sig(uch *sig, int num)
{
return !png_sig_cmp(sig, 0, num);
}
/* returns 0 for success, 2 for libpng problem, 4 for out of memory */
int readpng2_init(mainprog_info *mainprog_ptr)
{
png_structp png_ptr; /* note: temporary variables! */
png_infop info_ptr;
/* could also replace libpng warning-handler (final NULL), but no need: */
png_ptr = png_create_read_struct(png_get_libpng_ver(NULL), mainprog_ptr,
readpng2_error_handler, readpng2_warning_handler);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return 4; /* out of memory */
}
/* we could create a second info struct here (end_info), but it's only
* useful if we want to keep pre- and post-IDAT chunk info separated
* (mainly for PNG-aware image editors and converters) */
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function, unless an alternate error handler was installed--
* but compatible error handlers must either use longjmp() themselves
* (as in this program) or exit immediately, so here we are: */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return 2;
}
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
/* prepare the reader to ignore all recognized chunks whose data won't be
* used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
* IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
{
/* These byte strings were copied from png.h. If a future version
* of readpng2.c recognizes more chunks, add them to this list.
*/
static PNG_CONST png_byte chunks_to_process[] = {
98, 75, 71, 68, '\0', /* bKGD */
103, 65, 77, 65, '\0', /* gAMA */
115, 82, 71, 66, '\0', /* sRGB */
};
/* Ignore all chunks except for IHDR, PLTE, tRNS, IDAT, and IEND */
png_set_keep_unknown_chunks(png_ptr, -1 /* PNG_HANDLE_CHUNK_NEVER */,
NULL, -1);
/* But do not ignore chunks in the "chunks_to_process" list */
png_set_keep_unknown_chunks(png_ptr,
0 /* PNG_HANDLE_CHUNK_AS_DEFAULT */, chunks_to_process,
sizeof(chunks_to_process)/5);
}
#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */
/* instead of doing png_init_io() here, now we set up our callback
* functions for progressive decoding */
png_set_progressive_read_fn(png_ptr, mainprog_ptr,
readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
/* make sure we save our pointers for use in readpng2_decode_data() */
mainprog_ptr->png_ptr = png_ptr;
mainprog_ptr->info_ptr = info_ptr;
/* and that's all there is to initialization */
return 0;
}
/* returns 0 for success, 2 for libpng (longjmp) problem */
int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length)
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
/* setjmp() must be called in every function that calls a PNG-reading
* libpng function */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
return 2;
}
/* hand off the next chunk of input data to libpng for decoding */
png_process_data(png_ptr, info_ptr, rawbuf, length);
return 0;
}
static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
{
mainprog_info *mainprog_ptr;
int color_type, bit_depth;
png_uint_32 width, height;
#ifdef PNG_FLOATING_POINT_SUPPORTED
double gamma;
#else
png_fixed_point gamma;
#endif
/* setjmp() doesn't make sense here, because we'd either have to exit(),
* longjmp() ourselves, or return control to libpng, which doesn't want
* to see us again. By not doing anything here, libpng will instead jump
* to readpng2_decode_data(), which can return an error value to the main
* program. */
/* retrieve the pointer to our special-purpose struct, using the png_ptr
* that libpng passed back to us (i.e., not a global this time--there's
* no real difference for a single image, but for a multithreaded browser
* decoding several PNG images at the same time, one needs to avoid mixing
* up different images' structs) */
mainprog_ptr = png_get_progressive_ptr(png_ptr);
if (mainprog_ptr == NULL) { /* we be hosed */
fprintf(stderr,
"readpng2 error: main struct not recoverable in info_callback.\n");
fflush(stderr);
return;
/*
* Alternatively, we could call our error-handler just like libpng
* does, which would effectively terminate the program. Since this
* can only happen if png_ptr gets redirected somewhere odd or the
* main PNG struct gets wiped, we're probably toast anyway. (If
* png_ptr itself is NULL, we would not have been called.)
*/
}
/* this is just like in the non-progressive case */
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
mainprog_ptr->width = (ulg)width;
mainprog_ptr->height = (ulg)height;
/* since we know we've read all of the PNG file's "header" (i.e., up
* to IDAT), we can check for a background color here */
if (mainprog_ptr->need_bgcolor &&
png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
{
png_color_16p pBackground;
/* it is not obvious from the libpng documentation, but this function
* takes a pointer to a pointer, and it always returns valid red,
* green and blue values, regardless of color_type: */
png_get_bKGD(png_ptr, info_ptr, &pBackground);
/* however, it always returns the raw bKGD data, regardless of any
* bit-depth transformations, so check depth and adjust if necessary */
if (bit_depth == 16) {
mainprog_ptr->bg_red = pBackground->red >> 8;
mainprog_ptr->bg_green = pBackground->green >> 8;
mainprog_ptr->bg_blue = pBackground->blue >> 8;
} else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
if (bit_depth == 1)
mainprog_ptr->bg_red = mainprog_ptr->bg_green =
mainprog_ptr->bg_blue = pBackground->gray? 255 : 0;
else if (bit_depth == 2)
mainprog_ptr->bg_red = mainprog_ptr->bg_green =
mainprog_ptr->bg_blue = (255/3) * pBackground->gray;
else /* bit_depth == 4 */
mainprog_ptr->bg_red = mainprog_ptr->bg_green =
mainprog_ptr->bg_blue = (255/15) * pBackground->gray;
} else {
mainprog_ptr->bg_red = (uch)pBackground->red;
mainprog_ptr->bg_green = (uch)pBackground->green;
mainprog_ptr->bg_blue = (uch)pBackground->blue;
}
}
/* as before, let libpng expand palette images to RGB, low-bit-depth
* grayscale images to 8 bits, transparency chunks to full alpha channel;
* strip 16-bit-per-sample images to 8 bits per sample; and convert
* grayscale to RGB[A] */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
png_set_scale_16(png_ptr);
# else
png_set_strip_16(png_ptr);
# endif
#endif
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
/* Unlike the basic viewer, which was designed to operate on local files,
* this program is intended to simulate a web browser--even though we
* actually read from a local file, too. But because we are pretending
* that most of the images originate on the Internet, we follow the recom-
* mendation of the sRGB proposal and treat unlabelled images (no gAMA
* chunk) as existing in the sRGB color space. That is, we assume that
* such images have a file gamma of 0.45455, which corresponds to a PC-like
* display system. This change in assumptions will have no effect on a
* PC-like system, but on a Mac, SGI, NeXT or other system with a non-
* identity lookup table, it will darken unlabelled images, which effec-
* tively favors images from PC-like systems over those originating on
* the local platform. Note that mainprog_ptr->display_exponent is the
* "gamma" value for the entire display system, i.e., the product of
* LUT_exponent and CRT_exponent. */
#ifdef PNG_FLOATING_POINT_SUPPORTED
if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
else
png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
#else
if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
png_set_gamma_fixed(png_ptr,
(png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
else
png_set_gamma_fixed(png_ptr,
(png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
#endif
/* we'll let libpng expand interlaced images, too */
mainprog_ptr->passes = png_set_interlace_handling(png_ptr);
/* all transformations have been registered; now update info_ptr data and
* then get rowbytes and channels */
png_read_update_info(png_ptr, info_ptr);
mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);
mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);
/* Call the main program to allocate memory for the image buffer and
* initialize windows and whatnot. (The old-style function-pointer
* invocation is used for compatibility with a few supposedly ANSI
* compilers that nevertheless barf on "fn_ptr()"-style syntax.) */
(*mainprog_ptr->mainprog_init)();
/* and that takes care of initialization */
return;
}
static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
mainprog_info *mainprog_ptr;
/* first check whether the row differs from the previous pass; if not,
* nothing to combine or display */
if (!new_row)
return;
/* retrieve the pointer to our special-purpose struct so we can access
* the old rows and image-display callback function */
mainprog_ptr = png_get_progressive_ptr(png_ptr);
/* save the pass number for optional use by the front end */
mainprog_ptr->pass = pass;
/* have libpng either combine the new row data with the existing row data
* from previous passes (if interlaced) or else just copy the new row
* into the main program's image buffer */
png_progressive_combine_row(png_ptr, mainprog_ptr->row_pointers[row_num],
new_row);
/* finally, call the display routine in the main program with the number
* of the row we just updated */
(*mainprog_ptr->mainprog_display_row)(row_num);
/* and we're ready for more */
return;
}
static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr)
{
mainprog_info *mainprog_ptr;
/* retrieve the pointer to our special-purpose struct */
mainprog_ptr = png_get_progressive_ptr(png_ptr);
/* let the main program know that it should flush any buffered image
* data to the display now and set a "done" flag or whatever, but note
* that it SHOULD NOT DESTROY THE PNG STRUCTS YET--in other words, do
* NOT call readpng2_cleanup() either here or in the finish_display()
* routine; wait until control returns to the main program via
* readpng2_decode_data() */
(*mainprog_ptr->mainprog_finish_display)();
/* all done */
(void)info_ptr; /* Unused */
return;
}
void readpng2_cleanup(mainprog_info *mainprog_ptr)
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
if (png_ptr && info_ptr)
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
}
static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg)
{
fprintf(stderr, "readpng2 libpng warning: %s\n", msg);
fflush(stderr);
(void)png_ptr; /* Unused */
}
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
{
mainprog_info *mainprog_ptr;
/* This function, aside from the extra step of retrieving the "error
* pointer" (below) and the fact that it exists within the application
* rather than within libpng, is essentially identical to libpng's
* default error handler. The second point is critical: since both
* setjmp() and longjmp() are called from the same code, they are
* guaranteed to have compatible notions of how big a jmp_buf is,
* regardless of whether _BSD_SOURCE or anything else has (or has not)
* been defined. */
fprintf(stderr, "readpng2 libpng error: %s\n", msg);
fflush(stderr);
mainprog_ptr = png_get_error_ptr(png_ptr);
if (mainprog_ptr == NULL) { /* we are completely hosed now */
fprintf(stderr,
"readpng2 severe error: jmpbuf not recoverable; terminating.\n");
fflush(stderr);
exit(99);
}
/* Now we have our data structure we can use the information in it
* to return control to our own higher level code (all the points
* where 'setjmp' is called in this file.) This will work with other
* error handling mechanisms as well - libpng always calls png_error
* when it can proceed no further, thus, so long as the error handler
* is intercepted, application code can do its own error recovery.
*/
longjmp(mainprog_ptr->jmpbuf, 1);
}

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/*---------------------------------------------------------------------------
rpng2 - progressive-model PNG display program readpng2.h
---------------------------------------------------------------------------
Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif
#ifndef MAX
# define MAX(a,b) ((a) > (b)? (a) : (b))
# define MIN(a,b) ((a) < (b)? (a) : (b))
#endif
#ifdef DEBUG
# define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
#else
# define Trace(x) ;
#endif
enum rpng2_states {
kPreInit = 0,
kWindowInit,
kDone
};
typedef unsigned char uch;
typedef unsigned short ush;
typedef unsigned long ulg;
typedef struct _mainprog_info {
double display_exponent;
ulg width;
ulg height;
void *png_ptr;
void *info_ptr;
void (*mainprog_init)(void);
void (*mainprog_display_row)(ulg row_num);
void (*mainprog_finish_display)(void);
uch *image_data;
uch **row_pointers;
jmp_buf jmpbuf;
int passes; /* not used */
int pass;
int rowbytes;
int channels;
int need_bgcolor;
int state;
uch bg_red;
uch bg_green;
uch bg_blue;
} mainprog_info;
/* prototypes for public functions in readpng2.c */
void readpng2_version_info(void);
int readpng2_check_sig(uch *sig, int num);
int readpng2_init(mainprog_info *mainprog_ptr);
int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
void readpng2_cleanup(mainprog_info *mainprog_ptr);

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/*---------------------------------------------------------------------------
rpng - simple PNG display program readppm.c
---------------------------------------------------------------------------
This is a special-purpose replacement for readpng.c that allows binary
PPM files to be used in place of PNG images.
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include "readpng.h" /* typedefs, common macros, public prototypes */
ulg width, height;
int bit_depth, color_type, channels;
uch *image_data = NULL;
FILE *saved_infile;
void readpng_version_info()
{
fprintf(stderr, " Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");
}
/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
{
static uch ppmline[256];
int maxval;
saved_infile = infile;
fgets(ppmline, 256, infile);
if (ppmline[0] != 'P' || ppmline[1] != '6') {
fprintf(stderr, "ERROR: not a PPM file\n");
return 1;
}
/* possible color types: P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */
if (ppmline[1] == '6') {
color_type = 2;
channels = 3;
} else if (ppmline[1] == '8') {
color_type = 6;
channels = 4;
} else /* if (ppmline[1] == '5') */ {
color_type = 0;
channels = 1;
}
do {
fgets(ppmline, 256, infile);
} while (ppmline[0] == '#');
sscanf(ppmline, "%lu %lu", &width, &height);
do {
fgets(ppmline, 256, infile);
} while (ppmline[0] == '#');
sscanf(ppmline, "%d", &maxval);
if (maxval != 255) {
fprintf(stderr, "ERROR: maxval = %d\n", maxval);
return 2;
}
bit_depth = 8;
*pWidth = width;
*pHeight = height;
return 0;
}
/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
* scales values to 8-bit if necessary */
int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
{
return 1;
}
/* display_exponent == LUT_exponent * CRT_exponent */
uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
{
ulg rowbytes;
/* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
* transparency chunks to full alpha channel; strip 16-bit-per-sample
* images to 8 bits per sample; and convert grayscale to RGB[A] */
/* GRR WARNING: grayscale needs to be expanded and channels reset! */
*pRowbytes = rowbytes = channels*width;
*pChannels = channels;
if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
return NULL;
}
Trace((stderr, "readpng_get_image: rowbytes = %ld, height = %ld\n", rowbytes, height));
/* now we can go ahead and just read the whole image */
if (fread(image_data, 1L, rowbytes*height, saved_infile) <
rowbytes*height) {
free (image_data);
image_data = NULL;
return NULL;
}
return image_data;
}
void readpng_cleanup(int free_image_data)
{
if (free_image_data && image_data) {
free(image_data);
image_data = NULL;
}
}

728
src/third-party/libpng/contrib/gregbook/rpng-win.c vendored Normal file
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@ -0,0 +1,728 @@
/*---------------------------------------------------------------------------
rpng - simple PNG display program rpng-win.c
This program decodes and displays PNG images, with gamma correction and
optionally with a user-specified background color (in case the image has
transparency). It is very nearly the most basic PNG viewer possible.
This version is for 32-bit Windows; it may compile under 16-bit Windows
with a little tweaking (or maybe not).
to do:
- handle quoted command-line args (especially filenames with spaces)
- have minimum window width: oh well
- use %.1023s to simplify truncation of title-bar string?
---------------------------------------------------------------------------
Changelog:
- 1.00: initial public release
- 1.01: modified to allow abbreviated options; fixed long/ulong mis-
match; switched to png_jmpbuf() macro
- 1.02: added extra set of parentheses to png_jmpbuf() macro; fixed
command-line parsing bug
- 1.10: enabled "message window"/console (thanks to David Geldreich)
- 2.00: dual-licensed (added GNU GPL)
- 2.01: fixed improper display of usage screen on PNG error(s)
---------------------------------------------------------------------------
Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#define PROGNAME "rpng-win"
#define LONGNAME "Simple PNG Viewer for Windows"
#define VERSION "2.01 of 16 March 2008"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <windows.h>
#ifdef __CYGWIN__
/* getch replacement. Turns out, we don't really need this,
* but leave it here if we ever enable any of the uses of
* _getch in the main code
*/
#include <unistd.h>
#include <termio.h>
#include <sys/ioctl.h>
int repl_getch( void )
{
char ch;
int fd = fileno(stdin);
struct termio old_tty, new_tty;
ioctl(fd, TCGETA, &old_tty);
new_tty = old_tty;
new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
ioctl(fd, TCSETA, &new_tty);
fread(&ch, 1, sizeof(ch), stdin);
ioctl(fd, TCSETA, &old_tty);
return ch;
}
#define _getch repl_getch
#else
#include <conio.h> /* only for _getch() */
#endif
/* #define DEBUG : this enables the Trace() macros */
#include "readpng.h" /* typedefs, common macros, readpng prototypes */
/* could just include png.h, but this macro is the only thing we need
* (name and typedefs changed to local versions); note that side effects
* only happen with alpha (which could easily be avoided with
* "ush acopy = (alpha);") */
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
}
/* local prototypes */
static int rpng_win_create_window(HINSTANCE hInst, int showmode);
static int rpng_win_display_image(void);
static void rpng_win_cleanup(void);
LRESULT CALLBACK rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
static char titlebar[1024];
static char *progname = PROGNAME;
static char *appname = LONGNAME;
static char *filename;
static FILE *infile;
static char *bgstr;
static uch bg_red=0, bg_green=0, bg_blue=0;
static double display_exponent;
static ulg image_width, image_height, image_rowbytes;
static int image_channels;
static uch *image_data;
/* Windows-specific variables */
static ulg wimage_rowbytes;
static uch *dib;
static uch *wimage_data;
static BITMAPINFOHEADER *bmih;
static HWND global_hwnd;
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
{
char *args[1024]; /* arbitrary limit, but should suffice */
char *p, *q, **argv = args;
int argc = 0;
int rc, alen, flen;
int error = 0;
int have_bg = FALSE;
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
MSG msg;
filename = (char *)NULL;
#ifndef __CYGWIN__
/* First reenable console output, which normally goes to the bit bucket
* for windowed apps. Closing the console window will terminate the
* app. Thanks to David.Geldreich@realviz.com for supplying the magical
* incantation. */
AllocConsole();
freopen("CONOUT$", "a", stderr);
freopen("CONOUT$", "a", stdout);
#endif
/* Next set the default value for our display-system exponent, i.e.,
* the product of the CRT exponent and the exponent corresponding to
* the frame-buffer's lookup table (LUT), if any. This is not an
* exhaustive list of LUT values (e.g., OpenStep has a lot of weird
* ones), but it should cover 99% of the current possibilities. And
* yes, these ifdefs are completely wasted in a Windows program... */
#if defined(NeXT)
LUT_exponent = 1.0 / 2.2;
/*
if (some_next_function_that_returns_gamma(&next_gamma))
LUT_exponent = 1.0 / next_gamma;
*/
#elif defined(sgi)
LUT_exponent = 1.0 / 1.7;
/* there doesn't seem to be any documented function to get the
* "gamma" value, so we do it the hard way */
infile = fopen("/etc/config/system.glGammaVal", "r");
if (infile) {
double sgi_gamma;
fgets(tmpline, 80, infile);
fclose(infile);
sgi_gamma = atof(tmpline);
if (sgi_gamma > 0.0)
LUT_exponent = 1.0 / sgi_gamma;
}
#elif defined(Macintosh)
LUT_exponent = 1.8 / 2.61;
/*
if (some_mac_function_that_returns_gamma(&mac_gamma))
LUT_exponent = mac_gamma / 2.61;
*/
#else
LUT_exponent = 1.0; /* assume no LUT: most PCs */
#endif
/* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
default_display_exponent = LUT_exponent * CRT_exponent;
/* If the user has set the SCREEN_GAMMA environment variable as suggested
* (somewhat imprecisely) in the libpng documentation, use that; otherwise
* use the default value we just calculated. Either way, the user may
* override this via a command-line option. */
if ((p = getenv("SCREEN_GAMMA")) != NULL)
display_exponent = atof(p);
else
display_exponent = default_display_exponent;
/* Windows really hates command lines, so we have to set up our own argv.
* Note that we do NOT bother with quoted arguments here, so don't use
* filenames with spaces in 'em! */
argv[argc++] = PROGNAME;
p = cmd;
for (;;) {
if (*p == ' ')
while (*++p == ' ')
;
/* now p points at the first non-space after some spaces */
if (*p == '\0')
break; /* nothing after the spaces: done */
argv[argc++] = q = p;
while (*q && *q != ' ')
++q;
/* now q points at a space or the end of the string */
if (*q == '\0')
break; /* last argv already terminated; quit */
*q = '\0'; /* change space to terminator */
p = q + 1;
}
argv[argc] = NULL; /* terminate the argv array itself */
/* Now parse the command line for options and the PNG filename. */
while (*++argv && !error) {
if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
else {
display_exponent = atof(*argv);
if (display_exponent <= 0.0)
++error;
}
} else if (!strncmp(*argv, "-bgcolor", 2)) {
if (!*++argv)
++error;
else {
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else
have_bg = TRUE;
}
} else {
if (**argv != '-') {
filename = *argv;
if (argv[1]) /* shouldn't be any more args after filename */
++error;
} else
++error; /* not expecting any other options */
}
}
if (!filename)
++error;
/* print usage screen if any errors up to this point */
if (error) {
#ifndef __CYGWIN__
int ch;
#endif
fprintf(stderr, "\n%s %s: %s\n\n", PROGNAME, VERSION, appname);
readpng_version_info();
fprintf(stderr, "\n"
"Usage: %s [-gamma exp] [-bgcolor bg] file.png\n"
" exp \ttransfer-function exponent (``gamma'') of the display\n"
"\t\t system in floating-point format (e.g., ``%.1f''); equal\n"
"\t\t to the product of the lookup-table exponent (varies)\n"
"\t\t and the CRT exponent (usually 2.2); must be positive\n"
" bg \tdesired background color in 7-character hex RGB format\n"
"\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
"\t\t used with transparent images\n"
"\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
#ifndef __CYGWIN__
"Press Q or Esc to quit this usage screen.\n"
#endif
"\n", PROGNAME, default_display_exponent);
#ifndef __CYGWIN__
do
ch = _getch();
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
#endif
exit(1);
}
if (!(infile = fopen(filename, "rb"))) {
fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename);
++error;
} else {
if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
switch (rc) {
case 1:
fprintf(stderr, PROGNAME
": [%s] is not a PNG file: incorrect signature\n",
filename);
break;
case 2:
fprintf(stderr, PROGNAME
": [%s] has bad IHDR (libpng longjmp)\n", filename);
break;
case 4:
fprintf(stderr, PROGNAME ": insufficient memory\n");
break;
default:
fprintf(stderr, PROGNAME
": unknown readpng_init() error\n");
break;
}
++error;
}
if (error)
fclose(infile);
}
if (error) {
#ifndef __CYGWIN__
int ch;
#endif
fprintf(stderr, PROGNAME ": aborting.\n");
#ifndef __CYGWIN__
do
ch = _getch();
while (ch != 'q' && ch != 'Q' && ch != 0x1B);
#endif
exit(2);
} else {
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
#ifndef __CYGWIN__
fprintf(stderr,
"\n [console window: closing this window will terminate %s]\n\n",
PROGNAME);
#endif
}
/* set the title-bar string, but make sure buffer doesn't overflow */
alen = strlen(appname);
flen = strlen(filename);
if (alen + flen + 3 > 1023)
sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023));
else
sprintf(titlebar, "%s: %s", appname, filename);
/* if the user didn't specify a background color on the command line,
* check for one in the PNG file--if not, the initialized values of 0
* (black) will be used */
if (have_bg) {
unsigned r, g, b; /* this approach quiets compiler warnings */
sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
bg_red = (uch)r;
bg_green = (uch)g;
bg_blue = (uch)b;
} else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
readpng_cleanup(TRUE);
fprintf(stderr, PROGNAME
": libpng error while checking for background color\n");
exit(2);
}
/* do the basic Windows initialization stuff, make the window and fill it
* with the background color */
if (rpng_win_create_window(hInst, showmode))
exit(2);
/* decode the image, all at once */
Trace((stderr, "calling readpng_get_image()\n"))
image_data = readpng_get_image(display_exponent, &image_channels,
&image_rowbytes);
Trace((stderr, "done with readpng_get_image()\n"))
/* done with PNG file, so clean up to minimize memory usage (but do NOT
* nuke image_data!) */
readpng_cleanup(FALSE);
fclose(infile);
if (!image_data) {
fprintf(stderr, PROGNAME ": unable to decode PNG image\n");
exit(3);
}
/* display image (composite with background if requested) */
Trace((stderr, "calling rpng_win_display_image()\n"))
if (rpng_win_display_image()) {
free(image_data);
exit(4);
}
Trace((stderr, "done with rpng_win_display_image()\n"))
/* wait for the user to tell us when to quit */
printf(
#ifndef __CYGWIN__
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n"
#else
"Done. Press mouse button 1 (within image window) to quit.\n"
#endif
);
fflush(stdout);
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
/* OK, we're done: clean up all image and Windows resources and go away */
rpng_win_cleanup();
return msg.wParam;
}
static int rpng_win_create_window(HINSTANCE hInst, int showmode)
{
uch *dest;
int extra_width, extra_height;
ulg i, j;
WNDCLASSEX wndclass;
/*---------------------------------------------------------------------------
Allocate memory for the display-specific version of the image (round up
to multiple of 4 for Windows DIB).
---------------------------------------------------------------------------*/
wimage_rowbytes = ((3*image_width + 3L) >> 2) << 2;
if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
wimage_rowbytes*image_height)))
{
return 4; /* fail */
}
/*---------------------------------------------------------------------------
Initialize the DIB. Negative height means to use top-down BMP ordering
(must be uncompressed, but that's what we want). Bit count of 1, 4 or 8
implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
directly => wimage_data begins immediately after BMP header.
---------------------------------------------------------------------------*/
memset(dib, 0, sizeof(BITMAPINFOHEADER));
bmih = (BITMAPINFOHEADER *)dib;
bmih->biSize = sizeof(BITMAPINFOHEADER);
bmih->biWidth = image_width;
bmih->biHeight = -((long)image_height);
bmih->biPlanes = 1;
bmih->biBitCount = 24;
bmih->biCompression = 0;
wimage_data = dib + sizeof(BITMAPINFOHEADER);
/*---------------------------------------------------------------------------
Fill in background color (black by default); data are in BGR order.
---------------------------------------------------------------------------*/
for (j = 0; j < image_height; ++j) {
dest = wimage_data + j*wimage_rowbytes;
for (i = image_width; i > 0; --i) {
*dest++ = bg_blue;
*dest++ = bg_green;
*dest++ = bg_red;
}
}
/*---------------------------------------------------------------------------
Set the window parameters.
---------------------------------------------------------------------------*/
memset(&wndclass, 0, sizeof(wndclass));
wndclass.cbSize = sizeof(wndclass);
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = rpng_win_wndproc;
wndclass.hInstance = hInst;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = progname;
wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
RegisterClassEx(&wndclass);
/*---------------------------------------------------------------------------
Finally, create the window.
---------------------------------------------------------------------------*/
extra_width = 2*(GetSystemMetrics(SM_CXBORDER) +
GetSystemMetrics(SM_CXDLGFRAME));
extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
GetSystemMetrics(SM_CYDLGFRAME)) +
GetSystemMetrics(SM_CYCAPTION);
global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, image_width+extra_width,
image_height+extra_height, NULL, NULL, hInst, NULL);
ShowWindow(global_hwnd, showmode);
UpdateWindow(global_hwnd);
return 0;
} /* end function rpng_win_create_window() */
static int rpng_win_display_image()
{
uch *src, *dest;
uch r, g, b, a;
ulg i, row, lastrow;
RECT rect;
Trace((stderr, "beginning display loop (image_channels == %d)\n",
image_channels))
Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n",
image_width, image_rowbytes, wimage_rowbytes))
/*---------------------------------------------------------------------------
Blast image data to buffer. This whole routine takes place before the
message loop begins, so there's no real point in any pseudo-progressive
display...
---------------------------------------------------------------------------*/
for (lastrow = row = 0; row < image_height; ++row) {
src = image_data + row*image_rowbytes;
dest = wimage_data + row*wimage_rowbytes;
if (image_channels == 3) {
for (i = image_width; i > 0; --i) {
r = *src++;
g = *src++;
b = *src++;
*dest++ = b;
*dest++ = g; /* note reverse order */
*dest++ = r;
}
} else /* if (image_channels == 4) */ {
for (i = image_width; i > 0; --i) {
r = *src++;
g = *src++;
b = *src++;
a = *src++;
if (a == 255) {
*dest++ = b;
*dest++ = g;
*dest++ = r;
} else if (a == 0) {
*dest++ = bg_blue;
*dest++ = bg_green;
*dest++ = bg_red;
} else {
/* this macro (copied from png.h) composites the
* foreground and background values and puts the
* result into the first argument; there are no
* side effects with the first argument */
alpha_composite(*dest++, b, a, bg_blue);
alpha_composite(*dest++, g, a, bg_green);
alpha_composite(*dest++, r, a, bg_red);
}
}
}
/* display after every 16 lines */
if (((row+1) & 0xf) == 0) {
rect.left = 0L;
rect.top = (LONG)lastrow;
rect.right = (LONG)image_width; /* possibly off by one? */
rect.bottom = (LONG)lastrow + 16L; /* possibly off by one? */
InvalidateRect(global_hwnd, &rect, FALSE);
UpdateWindow(global_hwnd); /* similar to XFlush() */
lastrow = row + 1;
}
}
Trace((stderr, "calling final image-flush routine\n"))
if (lastrow < image_height) {
rect.left = 0L;
rect.top = (LONG)lastrow;
rect.right = (LONG)image_width; /* possibly off by one? */
rect.bottom = (LONG)image_height; /* possibly off by one? */
InvalidateRect(global_hwnd, &rect, FALSE);
UpdateWindow(global_hwnd); /* similar to XFlush() */
}
/*
last param determines whether or not background is wiped before paint
InvalidateRect(global_hwnd, NULL, TRUE);
UpdateWindow(global_hwnd);
*/
return 0;
}
static void rpng_win_cleanup()
{
if (image_data) {
free(image_data);
image_data = NULL;
}
if (dib) {
free(dib);
dib = NULL;
}
}
LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
{
HDC hdc;
PAINTSTRUCT ps;
int rc;
switch (iMsg) {
case WM_CREATE:
/* one-time processing here, if any */
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
/* dest */
rc = StretchDIBits(hdc, 0, 0, image_width, image_height,
/* source */
0, 0, image_width, image_height,
wimage_data, (BITMAPINFO *)bmih,
/* iUsage: no clue */
0, SRCCOPY);
EndPaint(hwnd, &ps);
return 0;
/* wait for the user to tell us when to quit */
case WM_CHAR:
switch (wP) { /* only need one, so ignore repeat count */
case 'q':
case 'Q':
case 0x1B: /* Esc key */
PostQuitMessage(0);
}
return 0;
case WM_LBUTTONDOWN: /* another way of quitting */
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, iMsg, wP, lP);
}

910
src/third-party/libpng/contrib/gregbook/rpng-x.c vendored Normal file
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@ -0,0 +1,910 @@
/*---------------------------------------------------------------------------
rpng - simple PNG display program rpng-x.c
This program decodes and displays PNG images, with gamma correction and
optionally with a user-specified background color (in case the image has
transparency). It is very nearly the most basic PNG viewer possible.
This version is for the X Window System (tested by author under Unix and
by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).
to do:
- 8-bit (colormapped) X support
- use %.1023s to simplify truncation of title-bar string?
---------------------------------------------------------------------------
Changelog:
- 1.01: initial public release
- 1.02: modified to allow abbreviated options; fixed long/ulong mis-
match; switched to png_jmpbuf() macro
- 1.10: added support for non-default visuals; fixed X pixel-conversion
- 1.11: added extra set of parentheses to png_jmpbuf() macro; fixed
command-line parsing bug
- 1.12: fixed some small X memory leaks (thanks to François Petitjean)
- 1.13: fixed XFreeGC() crash bug (thanks to Patrick Welche)
- 1.14: added support for X resources (thanks to Gerhard Niklasch)
- 2.00: dual-licensed (added GNU GPL)
- 2.01: fixed improper display of usage screen on PNG error(s)
- 2.02: Added "void(argc);" statement to quiet pedantic compiler warnings
about unused variable (GR-P)
---------------------------------------------------------------------------
Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#define PROGNAME "rpng-x"
#define LONGNAME "Simple PNG Viewer for X"
#define VERSION "2.02 of 15 June 2014"
#define RESNAME "rpng" /* our X resource application name */
#define RESCLASS "Rpng" /* our X resource class name */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/keysym.h>
/* #define DEBUG : this enables the Trace() macros */
#include "readpng.h" /* typedefs, common macros, readpng prototypes */
/* could just include png.h, but this macro is the only thing we need
* (name and typedefs changed to local versions); note that side effects
* only happen with alpha (which could easily be avoided with
* "ush acopy = (alpha);") */
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
}
/* local prototypes */
static int rpng_x_create_window(void);
static int rpng_x_display_image(void);
static void rpng_x_cleanup(void);
static int rpng_x_msb(ulg u32val);
static char titlebar[1024], *window_name = titlebar;
static char *appname = LONGNAME;
static char *icon_name = PROGNAME;
static char *res_name = RESNAME;
static char *res_class = RESCLASS;
static char *filename;
static FILE *infile;
static char *bgstr;
static uch bg_red=0, bg_green=0, bg_blue=0;
static double display_exponent;
static ulg image_width, image_height, image_rowbytes;
static int image_channels;
static uch *image_data;
/* X-specific variables */
static char *displayname;
static XImage *ximage;
static Display *display;
static int depth;
static Visual *visual;
static XVisualInfo *visual_list;
static int RShift, GShift, BShift;
static ulg RMask, GMask, BMask;
static Window window;
static GC gc;
static Colormap colormap;
static int have_nondefault_visual = FALSE;
static int have_colormap = FALSE;
static int have_window = FALSE;
static int have_gc = FALSE;
/*
ulg numcolors=0, pixels[256];
ush reds[256], greens[256], blues[256];
*/
int main(int argc, char **argv)
{
#ifdef sgi
char tmpline[80];
#endif
char *p;
int rc, alen, flen;
int error = 0;
int have_bg = FALSE;
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
XEvent e;
KeySym k;
displayname = (char *)NULL;
filename = (char *)NULL;
/* First set the default value for our display-system exponent, i.e.,
* the product of the CRT exponent and the exponent corresponding to
* the frame-buffer's lookup table (LUT), if any. This is not an
* exhaustive list of LUT values (e.g., OpenStep has a lot of weird
* ones), but it should cover 99% of the current possibilities. */
#if defined(NeXT)
LUT_exponent = 1.0 / 2.2;
/*
if (some_next_function_that_returns_gamma(&next_gamma))
LUT_exponent = 1.0 / next_gamma;
*/
#elif defined(sgi)
LUT_exponent = 1.0 / 1.7;
/* there doesn't seem to be any documented function to get the
* "gamma" value, so we do it the hard way */
infile = fopen("/etc/config/system.glGammaVal", "r");
if (infile) {
double sgi_gamma;
fgets(tmpline, 80, infile);
fclose(infile);
sgi_gamma = atof(tmpline);
if (sgi_gamma > 0.0)
LUT_exponent = 1.0 / sgi_gamma;
}
#elif defined(Macintosh)
LUT_exponent = 1.8 / 2.61;
/*
if (some_mac_function_that_returns_gamma(&mac_gamma))
LUT_exponent = mac_gamma / 2.61;
*/
#else
LUT_exponent = 1.0; /* assume no LUT: most PCs */
#endif
/* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
default_display_exponent = LUT_exponent * CRT_exponent;
/* If the user has set the SCREEN_GAMMA environment variable as suggested
* (somewhat imprecisely) in the libpng documentation, use that; otherwise
* use the default value we just calculated. Either way, the user may
* override this via a command-line option. */
if ((p = getenv("SCREEN_GAMMA")) != NULL)
display_exponent = atof(p);
else
display_exponent = default_display_exponent;
/* Now parse the command line for options and the PNG filename. */
while (*++argv && !error) {
if (!strncmp(*argv, "-display", 2)) {
if (!*++argv)
++error;
else
displayname = *argv;
} else if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
else {
display_exponent = atof(*argv);
if (display_exponent <= 0.0)
++error;
}
} else if (!strncmp(*argv, "-bgcolor", 2)) {
if (!*++argv)
++error;
else {
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else
have_bg = TRUE;
}
} else {
if (**argv != '-') {
filename = *argv;
if (argv[1]) /* shouldn't be any more args after filename */
++error;
} else
++error; /* not expecting any other options */
}
}
if (!filename)
++error;
/* print usage screen if any errors up to this point */
if (error) {
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, appname);
readpng_version_info();
fprintf(stderr, "\n"
"Usage: %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
" xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
" exp \ttransfer-function exponent (``gamma'') of the display\n"
"\t\t system in floating-point format (e.g., ``%.1f''); equal\n",
PROGNAME, default_display_exponent);
fprintf(stderr, "\n"
"\t\t to the product of the lookup-table exponent (varies)\n"
"\t\t and the CRT exponent (usually 2.2); must be positive\n"
" bg \tdesired background color in 7-character hex RGB format\n"
"\t\t (e.g., ``#ff7700'' for orange: same as HTML colors);\n"
"\t\t used with transparent images\n"
"\nPress Q, Esc or mouse button 1 (within image window, after image\n"
"is displayed) to quit.\n");
exit(1);
}
if (!(infile = fopen(filename, "rb"))) {
fprintf(stderr, PROGNAME ": can't open PNG file [%s]\n", filename);
++error;
} else {
if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
switch (rc) {
case 1:
fprintf(stderr, PROGNAME
": [%s] is not a PNG file: incorrect signature\n",
filename);
break;
case 2:
fprintf(stderr, PROGNAME
": [%s] has bad IHDR (libpng longjmp)\n", filename);
break;
case 4:
fprintf(stderr, PROGNAME ": insufficient memory\n");
break;
default:
fprintf(stderr, PROGNAME
": unknown readpng_init() error\n");
break;
}
++error;
} else {
display = XOpenDisplay(displayname);
if (!display) {
readpng_cleanup(TRUE);
fprintf(stderr, PROGNAME ": can't open X display [%s]\n",
displayname? displayname : "default");
++error;
}
}
if (error)
fclose(infile);
}
if (error) {
fprintf(stderr, PROGNAME ": aborting.\n");
exit(2);
}
/* set the title-bar string, but make sure buffer doesn't overflow */
alen = strlen(appname);
flen = strlen(filename);
if (alen + flen + 3 > 1023)
sprintf(titlebar, "%s: ...%s", appname, filename+(alen+flen+6-1023));
else
sprintf(titlebar, "%s: %s", appname, filename);
/* if the user didn't specify a background color on the command line,
* check for one in the PNG file--if not, the initialized values of 0
* (black) will be used */
if (have_bg) {
unsigned r, g, b; /* this approach quiets compiler warnings */
sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
bg_red = (uch)r;
bg_green = (uch)g;
bg_blue = (uch)b;
} else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
readpng_cleanup(TRUE);
fprintf(stderr, PROGNAME
": libpng error while checking for background color\n");
exit(2);
}
/* do the basic X initialization stuff, make the window and fill it
* with the background color */
if (rpng_x_create_window())
exit(2);
/* decode the image, all at once */
Trace((stderr, "calling readpng_get_image()\n"))
image_data = readpng_get_image(display_exponent, &image_channels,
&image_rowbytes);
Trace((stderr, "done with readpng_get_image()\n"))
/* done with PNG file, so clean up to minimize memory usage (but do NOT
* nuke image_data!) */
readpng_cleanup(FALSE);
fclose(infile);
if (!image_data) {
fprintf(stderr, PROGNAME ": unable to decode PNG image\n");
exit(3);
}
/* display image (composite with background if requested) */
Trace((stderr, "calling rpng_x_display_image()\n"))
if (rpng_x_display_image()) {
free(image_data);
exit(4);
}
Trace((stderr, "done with rpng_x_display_image()\n"))
/* wait for the user to tell us when to quit */
printf(
"Done. Press Q, Esc or mouse button 1 (within image window) to quit.\n");
fflush(stdout);
do
XNextEvent(display, &e);
while (!(e.type == ButtonPress && e.xbutton.button == Button1) &&
!(e.type == KeyPress && /* v--- or 1 for shifted keys */
((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) ));
/* OK, we're done: clean up all image and X resources and go away */
rpng_x_cleanup();
(void)argc; /* Unused */
return 0;
}
static int rpng_x_create_window(void)
{
uch *xdata;
int need_colormap = FALSE;
int screen, pad;
ulg bg_pixel = 0L;
ulg attrmask;
Window root;
XEvent e;
XGCValues gcvalues;
XSetWindowAttributes attr;
XTextProperty windowName, *pWindowName = &windowName;
XTextProperty iconName, *pIconName = &iconName;
XVisualInfo visual_info;
XSizeHints *size_hints;
XWMHints *wm_hints;
XClassHint *class_hints;
screen = DefaultScreen(display);
depth = DisplayPlanes(display, screen);
root = RootWindow(display, screen);
#ifdef DEBUG
XSynchronize(display, True);
#endif
#if 0
/* GRR: add 8-bit support */
if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
fprintf(stderr,
"screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n",
depth);
return 2;
}
XMatchVisualInfo(display, screen, depth,
(depth == 8)? PseudoColor : TrueColor, &visual_info);
visual = visual_info.visual;
#else
if (depth != 16 && depth != 24 && depth != 32) {
int visuals_matched = 0;
Trace((stderr, "default depth is %d: checking other visuals\n",
depth))
/* 24-bit first */
visual_info.screen = screen;
visual_info.depth = 24;
visual_list = XGetVisualInfo(display,
VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
if (visuals_matched == 0) {
/* GRR: add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
fprintf(stderr, "default screen depth %d not supported, and no"
" 24-bit visuals found\n", depth);
return 2;
}
Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
visuals_matched))
visual = visual_list[0].visual;
depth = visual_list[0].depth;
/*
colormap_size = visual_list[0].colormap_size;
visual_class = visual->class;
visualID = XVisualIDFromVisual(visual);
*/
have_nondefault_visual = TRUE;
need_colormap = TRUE;
} else {
XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
visual = visual_info.visual;
}
#endif
RMask = visual->red_mask;
GMask = visual->green_mask;
BMask = visual->blue_mask;
/* GRR: add/check 8-bit support */
if (depth == 8 || need_colormap) {
colormap = XCreateColormap(display, root, visual, AllocNone);
if (!colormap) {
fprintf(stderr, "XCreateColormap() failed\n");
return 2;
}
have_colormap = TRUE;
}
if (depth == 15 || depth == 16) {
RShift = 15 - rpng_x_msb(RMask); /* these are right-shifts */
GShift = 15 - rpng_x_msb(GMask);
BShift = 15 - rpng_x_msb(BMask);
} else if (depth > 16) {
#define NO_24BIT_MASKS
#ifdef NO_24BIT_MASKS
RShift = rpng_x_msb(RMask) - 7; /* these are left-shifts */
GShift = rpng_x_msb(GMask) - 7;
BShift = rpng_x_msb(BMask) - 7;
#else
RShift = 7 - rpng_x_msb(RMask); /* these are right-shifts, too */
GShift = 7 - rpng_x_msb(GMask);
BShift = 7 - rpng_x_msb(BMask);
#endif
}
if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
fprintf(stderr, "rpng internal logic error: negative X shift(s)!\n");
return 2;
}
/*---------------------------------------------------------------------------
Finally, create the window.
---------------------------------------------------------------------------*/
attr.backing_store = Always;
attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
attrmask = CWBackingStore | CWEventMask;
if (have_nondefault_visual) {
attr.colormap = colormap;
attr.background_pixel = 0;
attr.border_pixel = 1;
attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
}
window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0,
depth, InputOutput, visual, attrmask, &attr);
if (window == None) {
fprintf(stderr, "XCreateWindow() failed\n");
return 2;
} else
have_window = TRUE;
if (depth == 8)
XSetWindowColormap(display, window, colormap);
if (!XStringListToTextProperty(&window_name, 1, pWindowName))
pWindowName = NULL;
if (!XStringListToTextProperty(&icon_name, 1, pIconName))
pIconName = NULL;
/* OK if any hints allocation fails; XSetWMProperties() allows NULLs */
if ((size_hints = XAllocSizeHints()) != NULL) {
/* window will not be resizable */
size_hints->flags = PMinSize | PMaxSize;
size_hints->min_width = size_hints->max_width = (int)image_width;
size_hints->min_height = size_hints->max_height = (int)image_height;
}
if ((wm_hints = XAllocWMHints()) != NULL) {
wm_hints->initial_state = NormalState;
wm_hints->input = True;
/* wm_hints->icon_pixmap = icon_pixmap; */
wm_hints->flags = StateHint | InputHint /* | IconPixmapHint */ ;
}
if ((class_hints = XAllocClassHint()) != NULL) {
class_hints->res_name = res_name;
class_hints->res_class = res_class;
}
XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
size_hints, wm_hints, class_hints);
/* various properties and hints no longer needed; free memory */
if (pWindowName)
XFree(pWindowName->value);
if (pIconName)
XFree(pIconName->value);
if (size_hints)
XFree(size_hints);
if (wm_hints)
XFree(wm_hints);
if (class_hints)
XFree(class_hints);
XMapWindow(display, window);
gc = XCreateGC(display, window, 0, &gcvalues);
have_gc = TRUE;
/*---------------------------------------------------------------------------
Fill window with the specified background color.
---------------------------------------------------------------------------*/
if (depth == 24 || depth == 32) {
bg_pixel = ((ulg)bg_red << RShift) |
((ulg)bg_green << GShift) |
((ulg)bg_blue << BShift);
} else if (depth == 16) {
bg_pixel = ((((ulg)bg_red << 8) >> RShift) & RMask) |
((((ulg)bg_green << 8) >> GShift) & GMask) |
((((ulg)bg_blue << 8) >> BShift) & BMask);
} else /* depth == 8 */ {
/* GRR: add 8-bit support */
}
XSetForeground(display, gc, bg_pixel);
XFillRectangle(display, window, gc, 0, 0, image_width, image_height);
/*---------------------------------------------------------------------------
Wait for first Expose event to do any drawing, then flush.
---------------------------------------------------------------------------*/
do
XNextEvent(display, &e);
while (e.type != Expose || e.xexpose.count);
XFlush(display);
/*---------------------------------------------------------------------------
Allocate memory for the X- and display-specific version of the image.
---------------------------------------------------------------------------*/
if (depth == 24 || depth == 32) {
xdata = (uch *)malloc(4*image_width*image_height);
pad = 32;
} else if (depth == 16) {
xdata = (uch *)malloc(2*image_width*image_height);
pad = 16;
} else /* depth == 8 */ {
xdata = (uch *)malloc(image_width*image_height);
pad = 8;
}
if (!xdata) {
fprintf(stderr, PROGNAME ": unable to allocate image memory\n");
return 4;
}
ximage = XCreateImage(display, visual, depth, ZPixmap, 0,
(char *)xdata, image_width, image_height, pad, 0);
if (!ximage) {
fprintf(stderr, PROGNAME ": XCreateImage() failed\n");
free(xdata);
return 3;
}
/* to avoid testing the byte order every pixel (or doubling the size of
* the drawing routine with a giant if-test), we arbitrarily set the byte
* order to MSBFirst and let Xlib worry about inverting things on little-
* endian machines (like Linux/x86, old VAXen, etc.)--this is not the most
* efficient approach (the giant if-test would be better), but in the
* interest of clarity, we take the easy way out... */
ximage->byte_order = MSBFirst;
return 0;
} /* end function rpng_x_create_window() */
static int rpng_x_display_image(void)
{
uch *src;
char *dest;
uch r, g, b, a;
ulg i, row, lastrow = 0;
ulg pixel;
int ximage_rowbytes = ximage->bytes_per_line;
/* int bpp = ximage->bits_per_pixel; */
Trace((stderr, "beginning display loop (image_channels == %d)\n",
image_channels))
Trace((stderr, " (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
image_width, image_rowbytes, ximage_rowbytes))
Trace((stderr, " (bpp = %d)\n", ximage->bits_per_pixel))
Trace((stderr, " (byte_order = %s)\n", ximage->byte_order == MSBFirst?
"MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))
if (depth == 24 || depth == 32) {
ulg red, green, blue;
for (lastrow = row = 0; row < image_height; ++row) {
src = image_data + row*image_rowbytes;
dest = ximage->data + row*ximage_rowbytes;
if (image_channels == 3) {
for (i = image_width; i > 0; --i) {
red = *src++;
green = *src++;
blue = *src++;
#ifdef NO_24BIT_MASKS
pixel = (red << RShift) |
(green << GShift) |
(blue << BShift);
/* recall that we set ximage->byte_order = MSBFirst above */
/* GRR BUG: this assumes bpp == 32, but may be 24: */
*dest++ = (char)((pixel >> 24) & 0xff);
*dest++ = (char)((pixel >> 16) & 0xff);
*dest++ = (char)((pixel >> 8) & 0xff);
*dest++ = (char)( pixel & 0xff);
#else
red = (RShift < 0)? red << (-RShift) : red >> RShift;
green = (GShift < 0)? green << (-GShift) : green >> GShift;
blue = (BShift < 0)? blue << (-BShift) : blue >> BShift;
pixel = (red & RMask) | (green & GMask) | (blue & BMask);
/* recall that we set ximage->byte_order = MSBFirst above */
*dest++ = (char)((pixel >> 24) & 0xff);
*dest++ = (char)((pixel >> 16) & 0xff);
*dest++ = (char)((pixel >> 8) & 0xff);
*dest++ = (char)( pixel & 0xff);
#endif
}
} else /* if (image_channels == 4) */ {
for (i = image_width; i > 0; --i) {
r = *src++;
g = *src++;
b = *src++;
a = *src++;
if (a == 255) {
red = r;
green = g;
blue = b;
} else if (a == 0) {
red = bg_red;
green = bg_green;
blue = bg_blue;
} else {
/* this macro (from png.h) composites the foreground
* and background values and puts the result into the
* first argument */
alpha_composite(red, r, a, bg_red);
alpha_composite(green, g, a, bg_green);
alpha_composite(blue, b, a, bg_blue);
}
pixel = (red << RShift) |
(green << GShift) |
(blue << BShift);
/* recall that we set ximage->byte_order = MSBFirst above */
*dest++ = (char)((pixel >> 24) & 0xff);
*dest++ = (char)((pixel >> 16) & 0xff);
*dest++ = (char)((pixel >> 8) & 0xff);
*dest++ = (char)( pixel & 0xff);
}
}
/* display after every 16 lines */
if (((row+1) & 0xf) == 0) {
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
(int)lastrow, image_width, 16);
XFlush(display);
lastrow = row + 1;
}
}
} else if (depth == 16) {
ush red, green, blue;
for (lastrow = row = 0; row < image_height; ++row) {
src = image_data + row*image_rowbytes;
dest = ximage->data + row*ximage_rowbytes;
if (image_channels == 3) {
for (i = image_width; i > 0; --i) {
red = ((ush)(*src) << 8);
++src;
green = ((ush)(*src) << 8);
++src;
blue = ((ush)(*src) << 8);
++src;
pixel = ((red >> RShift) & RMask) |
((green >> GShift) & GMask) |
((blue >> BShift) & BMask);
/* recall that we set ximage->byte_order = MSBFirst above */
*dest++ = (char)((pixel >> 8) & 0xff);
*dest++ = (char)( pixel & 0xff);
}
} else /* if (image_channels == 4) */ {
for (i = image_width; i > 0; --i) {
r = *src++;
g = *src++;
b = *src++;
a = *src++;
if (a == 255) {
red = ((ush)r << 8);
green = ((ush)g << 8);
blue = ((ush)b << 8);
} else if (a == 0) {
red = ((ush)bg_red << 8);
green = ((ush)bg_green << 8);
blue = ((ush)bg_blue << 8);
} else {
/* this macro (from png.h) composites the foreground
* and background values and puts the result back into
* the first argument (== fg byte here: safe) */
alpha_composite(r, r, a, bg_red);
alpha_composite(g, g, a, bg_green);
alpha_composite(b, b, a, bg_blue);
red = ((ush)r << 8);
green = ((ush)g << 8);
blue = ((ush)b << 8);
}
pixel = ((red >> RShift) & RMask) |
((green >> GShift) & GMask) |
((blue >> BShift) & BMask);
/* recall that we set ximage->byte_order = MSBFirst above */
*dest++ = (char)((pixel >> 8) & 0xff);
*dest++ = (char)( pixel & 0xff);
}
}
/* display after every 16 lines */
if (((row+1) & 0xf) == 0) {
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
(int)lastrow, image_width, 16);
XFlush(display);
lastrow = row + 1;
}
}
} else /* depth == 8 */ {
/* GRR: add 8-bit support */
}
Trace((stderr, "calling final XPutImage()\n"))
if (lastrow < image_height) {
XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
(int)lastrow, image_width, image_height-lastrow);
XFlush(display);
}
return 0;
}
static void rpng_x_cleanup(void)
{
if (image_data) {
free(image_data);
image_data = NULL;
}
if (ximage) {
if (ximage->data) {
free(ximage->data); /* we allocated it, so we free it */
ximage->data = (char *)NULL; /* instead of XDestroyImage() */
}
XDestroyImage(ximage);
ximage = NULL;
}
if (have_gc)
XFreeGC(display, gc);
if (have_window)
XDestroyWindow(display, window);
if (have_colormap)
XFreeColormap(display, colormap);
if (have_nondefault_visual)
XFree(visual_list);
}
static int rpng_x_msb(ulg u32val)
{
int i;
for (i = 31; i >= 0; --i) {
if (u32val & 0x80000000L)
break;
u32val <<= 1;
}
return i;
}

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/*---------------------------------------------------------------------------
wpng - simple PNG-writing program wpng.c
This program converts certain NetPBM binary files (grayscale and RGB,
maxval = 255) to PNG. Non-interlaced PNGs are written progressively;
interlaced PNGs are read and written in one memory-intensive blast.
Thanks to Jean-loup Gailly for providing the necessary trick to read
interactive text from the keyboard while stdin is redirected. Thanks
to Cosmin Truta for Cygwin fixes.
NOTE: includes provisional support for PNM type "8" (portable alphamap)
images, presumed to be a 32-bit interleaved RGBA format; no pro-
vision for possible interleaved grayscale+alpha (16-bit) format.
THIS IS UNLIKELY TO BECOME AN OFFICIAL NETPBM ALPHA FORMAT!
to do:
- delete output file if quit before calling any writepng routines
- process backspace with -text option under DOS/Win? (currently get ^H)
---------------------------------------------------------------------------
Changelog:
- 1.01: initial public release
- 1.02: modified to allow abbreviated options
- 1.03: removed extraneous character from usage screen; fixed bug in
command-line parsing
- 1.04: fixed DOS/OS2/Win32 detection, including partial Cygwin fix
(see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
- 2.00: dual-licensed (added GNU GPL)
[REPORTED BUG (win32 only): "contrib/gregbook/wpng.c - cmd line
dose not work! In order to do something useful I needed to redirect
both input and output, with cygwin and with bcc32 as well. Under
Linux, the same wpng appears to work fine. I don't know what is
the problem."]
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#define PROGNAME "wpng"
#define VERSION "2.00 of 2 June 2007"
#define APPNAME "Simple PGM/PPM/PAM to PNG Converter"
#if defined(__MSDOS__) || defined(__OS2__)
# define DOS_OS2_W32
#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
# ifndef __GNUC__ /* treat Win32 native ports of gcc as Unix environments */
# define DOS_OS2_W32
# endif
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h> /* for jmpbuf declaration in writepng.h */
#include <time.h>
#ifdef DOS_OS2_W32
# include <io.h> /* for isatty(), setmode() prototypes */
# include <fcntl.h> /* O_BINARY for fdopen() without text translation */
# ifdef __EMX__
# ifndef getch
# define getch() _read_kbd(0, 1, 0) /* need getche() */
# endif
# else /* !__EMX__ */
# ifdef __GO32__
# include <pc.h>
# define getch() getkey() /* GRR: need getche() */
# else
# include <conio.h> /* for getche() console input */
# endif
# endif /* ?__EMX__ */
# define FGETS(buf,len,stream) dos_kbd_gets(buf,len)
#else
# include <unistd.h> /* for isatty() prototype */
# define FGETS fgets
#endif
/* #define DEBUG : this enables the Trace() macros */
/* #define FORBID_LATIN1_CTRL : this requires the user to re-enter any
text that includes control characters discouraged by the PNG spec; text
that includes an escape character (27) must be re-entered regardless */
#include "writepng.h" /* typedefs, common macros, writepng prototypes */
/* local prototypes */
static int wpng_isvalid_latin1(uch *p, int len);
static void wpng_cleanup(void);
#ifdef DOS_OS2_W32
static char *dos_kbd_gets(char *buf, int len);
#endif
static mainprog_info wpng_info; /* lone global */
int main(int argc, char **argv)
{
#ifndef DOS_OS2_W32
FILE *keybd;
#endif
#ifdef sgi
FILE *tmpfile; /* or we could just use keybd, since no overlap */
char tmpline[80];
#endif
char *inname = NULL, outname[256];
char *p, pnmchar, pnmline[256];
char *bgstr, *textbuf = NULL;
ulg rowbytes;
int rc, len = 0;
int error = 0;
int text = FALSE;
int maxval;
double LUT_exponent; /* just the lookup table */
double CRT_exponent = 2.2; /* just the monitor */
double default_display_exponent; /* whole display system */
double default_gamma = 0.0;
wpng_info.infile = NULL;
wpng_info.outfile = NULL;
wpng_info.image_data = NULL;
wpng_info.row_pointers = NULL;
wpng_info.filter = FALSE;
wpng_info.interlaced = FALSE;
wpng_info.have_bg = FALSE;
wpng_info.have_time = FALSE;
wpng_info.have_text = 0;
wpng_info.gamma = 0.0;
/* First get the default value for our display-system exponent, i.e.,
* the product of the CRT exponent and the exponent corresponding to
* the frame-buffer's lookup table (LUT), if any. If the PNM image
* looks correct on the user's display system, its file gamma is the
* inverse of this value. (Note that this is not an exhaustive list
* of LUT values--e.g., OpenStep has a lot of weird ones--but it should
* cover 99% of the current possibilities. This section must ensure
* that default_display_exponent is positive.) */
#if defined(NeXT)
/* third-party utilities can modify the default LUT exponent */
LUT_exponent = 1.0 / 2.2;
/*
if (some_next_function_that_returns_gamma(&next_gamma))
LUT_exponent = 1.0 / next_gamma;
*/
#elif defined(sgi)
LUT_exponent = 1.0 / 1.7;
/* there doesn't seem to be any documented function to
* get the "gamma" value, so we do it the hard way */
tmpfile = fopen("/etc/config/system.glGammaVal", "r");
if (tmpfile) {
double sgi_gamma;
fgets(tmpline, 80, tmpfile);
fclose(tmpfile);
sgi_gamma = atof(tmpline);
if (sgi_gamma > 0.0)
LUT_exponent = 1.0 / sgi_gamma;
}
#elif defined(Macintosh)
LUT_exponent = 1.8 / 2.61;
/*
if (some_mac_function_that_returns_gamma(&mac_gamma))
LUT_exponent = mac_gamma / 2.61;
*/
#else
LUT_exponent = 1.0; /* assume no LUT: most PCs */
#endif
/* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
default_display_exponent = LUT_exponent * CRT_exponent;
/* If the user has set the SCREEN_GAMMA environment variable as suggested
* (somewhat imprecisely) in the libpng documentation, use that; otherwise
* use the default value we just calculated. Either way, the user may
* override this via a command-line option. */
if ((p = getenv("SCREEN_GAMMA")) != NULL) {
double exponent = atof(p);
if (exponent > 0.0)
default_gamma = 1.0 / exponent;
}
if (default_gamma == 0.0)
default_gamma = 1.0 / default_display_exponent;
/* Now parse the command line for options and the PNM filename. */
while (*++argv && !error) {
if (!strncmp(*argv, "-i", 2)) {
wpng_info.interlaced = TRUE;
} else if (!strncmp(*argv, "-time", 3)) {
wpng_info.modtime = time(NULL);
wpng_info.have_time = TRUE;
} else if (!strncmp(*argv, "-text", 3)) {
text = TRUE;
} else if (!strncmp(*argv, "-gamma", 2)) {
if (!*++argv)
++error;
else {
wpng_info.gamma = atof(*argv);
if (wpng_info.gamma <= 0.0)
++error;
else if (wpng_info.gamma > 1.01)
fprintf(stderr, PROGNAME
" warning: file gammas are usually less than 1.0\n");
}
} else if (!strncmp(*argv, "-bgcolor", 4)) {
if (!*++argv)
++error;
else {
bgstr = *argv;
if (strlen(bgstr) != 7 || bgstr[0] != '#')
++error;
else {
unsigned r, g, b; /* this way quiets compiler warnings */
sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
wpng_info.bg_red = (uch)r;
wpng_info.bg_green = (uch)g;
wpng_info.bg_blue = (uch)b;
wpng_info.have_bg = TRUE;
}
}
} else {
if (**argv != '-') {
inname = *argv;
if (argv[1]) /* shouldn't be any more args after filename */
++error;
} else
++error; /* not expecting any other options */
}
}
/* open the input and output files, or register an error and abort */
if (!inname) {
if (isatty(0)) {
fprintf(stderr, PROGNAME
": must give input filename or provide image data via stdin\n");
++error;
} else {
#ifdef DOS_OS2_W32
/* some buggy C libraries require BOTH setmode() and fdopen(bin) */
setmode(fileno(stdin), O_BINARY);
setmode(fileno(stdout), O_BINARY);
#endif
if ((wpng_info.infile = fdopen(fileno(stdin), "rb")) == NULL) {
fprintf(stderr, PROGNAME
": unable to reopen stdin in binary mode\n");
++error;
} else
if ((wpng_info.outfile = fdopen(fileno(stdout), "wb")) == NULL) {
fprintf(stderr, PROGNAME
": unable to reopen stdout in binary mode\n");
fclose(wpng_info.infile);
++error;
} else
wpng_info.filter = TRUE;
}
} else if ((len = strlen(inname)) > 250) {
fprintf(stderr, PROGNAME ": input filename is too long [%d chars]\n",
len);
++error;
} else if (!(wpng_info.infile = fopen(inname, "rb"))) {
fprintf(stderr, PROGNAME ": can't open input file [%s]\n", inname);
++error;
}
if (!error) {
fgets(pnmline, 256, wpng_info.infile);
if (pnmline[0] != 'P' || ((pnmchar = pnmline[1]) != '5' &&
pnmchar != '6' && pnmchar != '8'))
{
fprintf(stderr, PROGNAME
": input file [%s] is not a binary PGM, PPM or PAM file\n",
inname);
++error;
} else {
wpng_info.pnmtype = (int)(pnmchar - '0');
if (wpng_info.pnmtype != 8)
wpng_info.have_bg = FALSE; /* no need for bg if opaque */
do {
fgets(pnmline, 256, wpng_info.infile); /* lose any comments */
} while (pnmline[0] == '#');
sscanf(pnmline, "%ld %ld", &wpng_info.width, &wpng_info.height);
do {
fgets(pnmline, 256, wpng_info.infile); /* more comment lines */
} while (pnmline[0] == '#');
sscanf(pnmline, "%d", &maxval);
if (wpng_info.width <= 0L || wpng_info.height <= 0L ||
maxval != 255)
{
fprintf(stderr, PROGNAME
": only positive width/height, maxval == 255 allowed \n");
++error;
}
wpng_info.sample_depth = 8; /* <==> maxval 255 */
if (!wpng_info.filter) {
/* make outname from inname */
if ((p = strrchr(inname, '.')) == NULL ||
(p - inname) != (len - 4))
{
strcpy(outname, inname);
strcpy(outname+len, ".png");
} else {
len -= 4;
strncpy(outname, inname, len);
strcpy(outname+len, ".png");
}
/* check if outname already exists; if not, open */
if ((wpng_info.outfile = fopen(outname, "rb")) != NULL) {
fprintf(stderr, PROGNAME ": output file exists [%s]\n",
outname);
fclose(wpng_info.outfile);
++error;
} else if (!(wpng_info.outfile = fopen(outname, "wb"))) {
fprintf(stderr, PROGNAME ": can't open output file [%s]\n",
outname);
++error;
}
}
}
if (error) {
fclose(wpng_info.infile);
wpng_info.infile = NULL;
if (wpng_info.filter) {
fclose(wpng_info.outfile);
wpng_info.outfile = NULL;
}
}
}
/* if we had any errors, print usage and die horrible death...arrr! */
if (error) {
fprintf(stderr, "\n%s %s: %s\n", PROGNAME, VERSION, APPNAME);
writepng_version_info();
fprintf(stderr, "\n"
"Usage: %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n"
"or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n"
" exp \ttransfer-function exponent (``gamma'') of the image in\n"
"\t\t floating-point format (e.g., ``%.5f''); if image looks\n"
"\t\t correct on given display system, image gamma is equal to\n"
"\t\t inverse of display-system exponent, i.e., 1 / (LUT * CRT)\n"
"\t\t (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
"\t\t first varies, second is usually 2.2, all are positive)\n"
" bg \tdesired background color for alpha-channel images, in\n"
"\t\t 7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
"\t\t same as HTML colors)\n"
" -text\tprompt interactively for text info (tEXt chunks)\n"
" -time\tinclude a tIME chunk (last modification time)\n"
" -interlace\twrite interlaced PNG image\n"
"\n"
"pnmfile or stdin must be a binary PGM (`P5'), PPM (`P6') or (extremely\n"
"unofficial and unsupported!) PAM (`P8') file. Currently it is required\n"
"to have maxval == 255 (i.e., no scaling). If pnmfile is specified, it\n"
"is converted to the corresponding PNG file with the same base name but a\n"
"``.png'' extension; files read from stdin are converted and sent to stdout.\n"
"The conversion is progressive (low memory usage) unless interlacing is\n"
"requested; in that case the whole image will be buffered in memory and\n"
"written in one call.\n"
"\n", PROGNAME, PROGNAME, default_gamma);
exit(1);
}
/* prepare the text buffers for libpng's use; note that even though
* PNG's png_text struct includes a length field, we don't have to fill
* it out */
if (text &&
#ifndef DOS_OS2_W32
(keybd = fdopen(fileno(stderr), "r")) != NULL &&
#endif
(textbuf = (char *)malloc((5 + 9)*75)) != NULL)
{
int i, valid, result;
fprintf(stderr,
"Enter text info (no more than 72 characters per line);\n");
fprintf(stderr, "to skip a field, hit the <Enter> key.\n");
/* note: just <Enter> leaves len == 1 */
do {
valid = TRUE;
p = textbuf + TEXT_TITLE_OFFSET;
fprintf(stderr, " Title: ");
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
if (p[len-1] == '\n')
p[--len] = '\0';
wpng_info.title = p;
wpng_info.have_text |= TEXT_TITLE;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_TITLE;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_TITLE;
valid = FALSE;
}
#endif
}
}
} while (!valid);
do {
valid = TRUE;
p = textbuf + TEXT_AUTHOR_OFFSET;
fprintf(stderr, " Author: ");
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
if (p[len-1] == '\n')
p[--len] = '\0';
wpng_info.author = p;
wpng_info.have_text |= TEXT_AUTHOR;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_AUTHOR;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_AUTHOR;
valid = FALSE;
}
#endif
}
}
} while (!valid);
do {
valid = TRUE;
p = textbuf + TEXT_DESC_OFFSET;
fprintf(stderr, " Description (up to 9 lines):\n");
for (i = 1; i < 10; ++i) {
fprintf(stderr, " [%d] ", i);
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1)
p += len; /* now points at NULL; char before is newline */
else
break;
}
if ((len = p - (textbuf + TEXT_DESC_OFFSET)) > 1) {
if (p[-1] == '\n') {
p[-1] = '\0';
--len;
}
wpng_info.desc = textbuf + TEXT_DESC_OFFSET;
wpng_info.have_text |= TEXT_DESC;
p = textbuf + TEXT_DESC_OFFSET;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_DESC;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_DESC;
valid = FALSE;
}
#endif
}
}
} while (!valid);
do {
valid = TRUE;
p = textbuf + TEXT_COPY_OFFSET;
fprintf(stderr, " Copyright: ");
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
if (p[len-1] == '\n')
p[--len] = '\0';
wpng_info.copyright = p;
wpng_info.have_text |= TEXT_COPY;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_COPY;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_COPY;
valid = FALSE;
}
#endif
}
}
} while (!valid);
do {
valid = TRUE;
p = textbuf + TEXT_EMAIL_OFFSET;
fprintf(stderr, " E-mail: ");
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
if (p[len-1] == '\n')
p[--len] = '\0';
wpng_info.email = p;
wpng_info.have_text |= TEXT_EMAIL;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_EMAIL;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_EMAIL;
valid = FALSE;
}
#endif
}
}
} while (!valid);
do {
valid = TRUE;
p = textbuf + TEXT_URL_OFFSET;
fprintf(stderr, " URL: ");
fflush(stderr);
if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
if (p[len-1] == '\n')
p[--len] = '\0';
wpng_info.url = p;
wpng_info.have_text |= TEXT_URL;
if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
fprintf(stderr, " " PROGNAME " warning: character code"
" %u is %sdiscouraged by the PNG\n specification "
"[first occurrence was at character position #%d]\n",
(unsigned)p[result], (p[result] == 27)? "strongly " : "",
result+1);
fflush(stderr);
#ifdef FORBID_LATIN1_CTRL
wpng_info.have_text &= ~TEXT_URL;
valid = FALSE;
#else
if (p[result] == 27) { /* escape character */
wpng_info.have_text &= ~TEXT_URL;
valid = FALSE;
}
#endif
}
}
} while (!valid);
#ifndef DOS_OS2_W32
fclose(keybd);
#endif
} else if (text) {
fprintf(stderr, PROGNAME ": unable to allocate memory for text\n");
text = FALSE;
wpng_info.have_text = 0;
}
/* allocate libpng stuff, initialize transformations, write pre-IDAT data */
if ((rc = writepng_init(&wpng_info)) != 0) {
switch (rc) {
case 2:
fprintf(stderr, PROGNAME
": libpng initialization problem (longjmp)\n");
break;
case 4:
fprintf(stderr, PROGNAME ": insufficient memory\n");
break;
case 11:
fprintf(stderr, PROGNAME
": internal logic error (unexpected PNM type)\n");
break;
default:
fprintf(stderr, PROGNAME
": unknown writepng_init() error\n");
break;
}
exit(rc);
}
/* free textbuf, since it's a completely local variable and all text info
* has just been written to the PNG file */
if (text && textbuf) {
free(textbuf);
textbuf = NULL;
}
/* calculate rowbytes on basis of image type; note that this becomes much
* more complicated if we choose to support PBM type, ASCII PNM types, or
* 16-bit-per-sample binary data [currently not an official NetPBM type] */
if (wpng_info.pnmtype == 5)
rowbytes = wpng_info.width;
else if (wpng_info.pnmtype == 6)
rowbytes = wpng_info.width * 3;
else /* if (wpng_info.pnmtype == 8) */
rowbytes = wpng_info.width * 4;
/* read and write the image, either in its entirety (if writing interlaced
* PNG) or row by row (if non-interlaced) */
fprintf(stderr, "Encoding image data...\n");
fflush(stderr);
if (wpng_info.interlaced) {
long i;
ulg bytes;
ulg image_bytes = rowbytes * wpng_info.height; /* overflow? */
wpng_info.image_data = (uch *)malloc(image_bytes);
wpng_info.row_pointers = (uch **)malloc(wpng_info.height*sizeof(uch *));
if (wpng_info.image_data == NULL || wpng_info.row_pointers == NULL) {
fprintf(stderr, PROGNAME ": insufficient memory for image data\n");
writepng_cleanup(&wpng_info);
wpng_cleanup();
exit(5);
}
for (i = 0; i < wpng_info.height; ++i)
wpng_info.row_pointers[i] = wpng_info.image_data + i*rowbytes;
bytes = fread(wpng_info.image_data, 1, image_bytes, wpng_info.infile);
if (bytes != image_bytes) {
fprintf(stderr, PROGNAME ": expected %lu bytes, got %lu bytes\n",
image_bytes, bytes);
fprintf(stderr, " (continuing anyway)\n");
}
if (writepng_encode_image(&wpng_info) != 0) {
fprintf(stderr, PROGNAME
": libpng problem (longjmp) while writing image data\n");
writepng_cleanup(&wpng_info);
wpng_cleanup();
exit(2);
}
} else /* not interlaced: write progressively (row by row) */ {
long j;
ulg bytes;
wpng_info.image_data = (uch *)malloc(rowbytes);
if (wpng_info.image_data == NULL) {
fprintf(stderr, PROGNAME ": insufficient memory for row data\n");
writepng_cleanup(&wpng_info);
wpng_cleanup();
exit(5);
}
error = 0;
for (j = wpng_info.height; j > 0L; --j) {
bytes = fread(wpng_info.image_data, 1, rowbytes, wpng_info.infile);
if (bytes != rowbytes) {
fprintf(stderr, PROGNAME
": expected %lu bytes, got %lu bytes (row %ld)\n", rowbytes,
bytes, wpng_info.height-j);
++error;
break;
}
if (writepng_encode_row(&wpng_info) != 0) {
fprintf(stderr, PROGNAME
": libpng problem (longjmp) while writing row %ld\n",
wpng_info.height-j);
++error;
break;
}
}
if (error) {
writepng_cleanup(&wpng_info);
wpng_cleanup();
exit(2);
}
if (writepng_encode_finish(&wpng_info) != 0) {
fprintf(stderr, PROGNAME ": error on final libpng call\n");
writepng_cleanup(&wpng_info);
wpng_cleanup();
exit(2);
}
}
/* OK, we're done (successfully): clean up all resources and quit */
fprintf(stderr, "Done.\n");
fflush(stderr);
writepng_cleanup(&wpng_info);
wpng_cleanup();
return 0;
}
static int wpng_isvalid_latin1(uch *p, int len)
{
int i, result = -1;
for (i = 0; i < len; ++i) {
if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160)
continue; /* character is completely OK */
if (result < 0 || (p[result] != 27 && p[i] == 27))
result = i; /* mark location of first questionable one */
} /* or of first escape character (bad) */
return result;
}
static void wpng_cleanup(void)
{
if (wpng_info.outfile) {
fclose(wpng_info.outfile);
wpng_info.outfile = NULL;
}
if (wpng_info.infile) {
fclose(wpng_info.infile);
wpng_info.infile = NULL;
}
if (wpng_info.image_data) {
free(wpng_info.image_data);
wpng_info.image_data = NULL;
}
if (wpng_info.row_pointers) {
free(wpng_info.row_pointers);
wpng_info.row_pointers = NULL;
}
}
#ifdef DOS_OS2_W32
static char *dos_kbd_gets(char *buf, int len)
{
int ch, count=0;
do {
buf[count++] = ch = getche();
} while (ch != '\r' && count < len-1);
buf[count--] = '\0'; /* terminate string */
if (buf[count] == '\r') /* Enter key makes CR, so change to newline */
buf[count] = '\n';
fprintf(stderr, "\n"); /* Enter key does *not* cause a newline */
fflush(stderr);
return buf;
}
#endif /* DOS_OS2_W32 */

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/*---------------------------------------------------------------------------
wpng - simple PNG-writing program writepng.c
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#include <stdlib.h> /* for exit() prototype */
#include <zlib.h>
#include "png.h" /* libpng header, includes setjmp.h */
#include "writepng.h" /* typedefs, common macros, public prototypes */
/* local prototype */
static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
void writepng_version_info(void)
{
fprintf(stderr, " Compiled with libpng %s; using libpng %s.\n",
PNG_LIBPNG_VER_STRING, png_libpng_ver);
fprintf(stderr, " Compiled with zlib %s; using zlib %s.\n",
ZLIB_VERSION, zlib_version);
}
/* returns 0 for success, 2 for libpng problem, 4 for out of memory, 11 for
* unexpected pnmtype; note that outfile might be stdout */
int writepng_init(mainprog_info *mainprog_ptr)
{
png_structp png_ptr; /* note: temporary variables! */
png_infop info_ptr;
int color_type, interlace_type;
/* could also replace libpng warning-handler (final NULL), but no need: */
png_ptr = png_create_write_struct(png_get_libpng_ver(NULL), mainprog_ptr,
writepng_error_handler, NULL);
if (!png_ptr)
return 4; /* out of memory */
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, NULL);
return 4; /* out of memory */
}
/* setjmp() must be called in every function that calls a PNG-writing
* libpng function, unless an alternate error handler was installed--
* but compatible error handlers must either use longjmp() themselves
* (as in this program) or some other method to return control to
* application code, so here we go: */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return 2;
}
/* make sure outfile is (re)opened in BINARY mode */
png_init_io(png_ptr, mainprog_ptr->outfile);
/* set the compression levels--in general, always want to leave filtering
* turned on (except for palette images) and allow all of the filters,
* which is the default; want 32K zlib window, unless entire image buffer
* is 16K or smaller (unknown here)--also the default; usually want max
* compression (NOT the default); and remaining compression flags should
* be left alone */
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
/*
>> this is default for no filtering; Z_FILTERED is default otherwise:
png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
>> these are all defaults:
png_set_compression_mem_level(png_ptr, 8);
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
*/
/* set the image parameters appropriately */
if (mainprog_ptr->pnmtype == 5)
color_type = PNG_COLOR_TYPE_GRAY;
else if (mainprog_ptr->pnmtype == 6)
color_type = PNG_COLOR_TYPE_RGB;
else if (mainprog_ptr->pnmtype == 8)
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
else {
png_destroy_write_struct(&png_ptr, &info_ptr);
return 11;
}
interlace_type = mainprog_ptr->interlaced? PNG_INTERLACE_ADAM7 :
PNG_INTERLACE_NONE;
png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
mainprog_ptr->sample_depth, color_type, interlace_type,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
if (mainprog_ptr->gamma > 0.0)
png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma);
if (mainprog_ptr->have_bg) { /* we know it's RGBA, not gray+alpha */
png_color_16 background;
background.red = mainprog_ptr->bg_red;
background.green = mainprog_ptr->bg_green;
background.blue = mainprog_ptr->bg_blue;
png_set_bKGD(png_ptr, info_ptr, &background);
}
if (mainprog_ptr->have_time) {
png_time modtime;
png_convert_from_time_t(&modtime, mainprog_ptr->modtime);
png_set_tIME(png_ptr, info_ptr, &modtime);
}
if (mainprog_ptr->have_text) {
png_text text[6];
int num_text = 0;
if (mainprog_ptr->have_text & TEXT_TITLE) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "Title";
text[num_text].text = mainprog_ptr->title;
++num_text;
}
if (mainprog_ptr->have_text & TEXT_AUTHOR) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "Author";
text[num_text].text = mainprog_ptr->author;
++num_text;
}
if (mainprog_ptr->have_text & TEXT_DESC) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "Description";
text[num_text].text = mainprog_ptr->desc;
++num_text;
}
if (mainprog_ptr->have_text & TEXT_COPY) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "Copyright";
text[num_text].text = mainprog_ptr->copyright;
++num_text;
}
if (mainprog_ptr->have_text & TEXT_EMAIL) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "E-mail";
text[num_text].text = mainprog_ptr->email;
++num_text;
}
if (mainprog_ptr->have_text & TEXT_URL) {
text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
text[num_text].key = "URL";
text[num_text].text = mainprog_ptr->url;
++num_text;
}
png_set_text(png_ptr, info_ptr, text, num_text);
}
/* write all chunks up to (but not including) first IDAT */
png_write_info(png_ptr, info_ptr);
/* if we wanted to write any more text info *after* the image data, we
* would set up text struct(s) here and call png_set_text() again, with
* just the new data; png_set_tIME() could also go here, but it would
* have no effect since we already called it above (only one tIME chunk
* allowed) */
/* set up the transformations: for now, just pack low-bit-depth pixels
* into bytes (one, two or four pixels per byte) */
png_set_packing(png_ptr);
/* png_set_shift(png_ptr, &sig_bit); to scale low-bit-depth values */
/* make sure we save our pointers for use in writepng_encode_image() */
mainprog_ptr->png_ptr = png_ptr;
mainprog_ptr->info_ptr = info_ptr;
/* OK, that's all we need to do for now; return happy */
return 0;
}
/* returns 0 for success, 2 for libpng (longjmp) problem */
int writepng_encode_image(mainprog_info *mainprog_ptr)
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
return 2;
}
/* and now we just write the whole image; libpng takes care of interlacing
* for us */
png_write_image(png_ptr, mainprog_ptr->row_pointers);
/* since that's it, we also close out the end of the PNG file now--if we
* had any text or time info to write after the IDATs, second argument
* would be info_ptr, but we optimize slightly by sending NULL pointer: */
png_write_end(png_ptr, NULL);
return 0;
}
/* returns 0 if succeeds, 2 if libpng problem */
int writepng_encode_row(mainprog_info *mainprog_ptr) /* NON-interlaced only! */
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
return 2;
}
/* image_data points at our one row of image data */
png_write_row(png_ptr, mainprog_ptr->image_data);
return 0;
}
/* returns 0 if succeeds, 2 if libpng problem */
int writepng_encode_finish(mainprog_info *mainprog_ptr) /* NON-interlaced! */
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
/* as always, setjmp() must be called in every function that calls a
* PNG-writing libpng function */
if (setjmp(mainprog_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
mainprog_ptr->png_ptr = NULL;
mainprog_ptr->info_ptr = NULL;
return 2;
}
/* close out PNG file; if we had any text or time info to write after
* the IDATs, second argument would be info_ptr: */
png_write_end(png_ptr, NULL);
return 0;
}
void writepng_cleanup(mainprog_info *mainprog_ptr)
{
png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
if (png_ptr && info_ptr)
png_destroy_write_struct(&png_ptr, &info_ptr);
}
static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
{
mainprog_info *mainprog_ptr;
/* This function, aside from the extra step of retrieving the "error
* pointer" (below) and the fact that it exists within the application
* rather than within libpng, is essentially identical to libpng's
* default error handler. The second point is critical: since both
* setjmp() and longjmp() are called from the same code, they are
* guaranteed to have compatible notions of how big a jmp_buf is,
* regardless of whether _BSD_SOURCE or anything else has (or has not)
* been defined. */
fprintf(stderr, "writepng libpng error: %s\n", msg);
fflush(stderr);
mainprog_ptr = png_get_error_ptr(png_ptr);
if (mainprog_ptr == NULL) { /* we are completely hosed now */
fprintf(stderr,
"writepng severe error: jmpbuf not recoverable; terminating.\n");
fflush(stderr);
exit(99);
}
/* Now we have our data structure we can use the information in it
* to return control to our own higher level code (all the points
* where 'setjmp' is called in this file.) This will work with other
* error handling mechanisms as well - libpng always calls png_error
* when it can proceed no further, thus, so long as the error handler
* is intercepted, application code can do its own error recovery.
*/
longjmp(mainprog_ptr->jmpbuf, 1);
}

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/*---------------------------------------------------------------------------
wpng - simple PNG-writing program writepng.h
---------------------------------------------------------------------------
Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
This software is provided "as is," without warranty of any kind,
express or implied. In no event shall the author or contributors
be held liable for any damages arising in any way from the use of
this software.
The contents of this file are DUAL-LICENSED. You may modify and/or
redistribute this software according to the terms of one of the
following two licenses (at your option):
LICENSE 1 ("BSD-like with advertising clause"):
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute
it freely, subject to the following restrictions:
1. Redistributions of source code must retain the above copyright
notice, disclaimer, and this list of conditions.
2. Redistributions in binary form must reproduce the above copyright
notice, disclaimer, and this list of conditions in the documenta-
tion and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this
software must display the following acknowledgment:
This product includes software developed by Greg Roelofs
and contributors for the book, "PNG: The Definitive Guide,"
published by O'Reilly and Associates.
LICENSE 2 (GNU GPL v2 or later):
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------*/
#ifndef TRUE
# define TRUE 1
# define FALSE 0
#endif
#ifndef MAX
# define MAX(a,b) ((a) > (b)? (a) : (b))
# define MIN(a,b) ((a) < (b)? (a) : (b))
#endif
#ifdef DEBUG
# define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
#else
# define Trace(x) ;
#endif
#define TEXT_TITLE 0x01
#define TEXT_AUTHOR 0x02
#define TEXT_DESC 0x04
#define TEXT_COPY 0x08
#define TEXT_EMAIL 0x10
#define TEXT_URL 0x20
#define TEXT_TITLE_OFFSET 0
#define TEXT_AUTHOR_OFFSET 72
#define TEXT_COPY_OFFSET (2*72)
#define TEXT_EMAIL_OFFSET (3*72)
#define TEXT_URL_OFFSET (4*72)
#define TEXT_DESC_OFFSET (5*72)
typedef unsigned char uch;
typedef unsigned short ush;
typedef unsigned long ulg;
typedef struct _mainprog_info {
double gamma;
long width;
long height;
time_t modtime;
FILE *infile;
FILE *outfile;
void *png_ptr;
void *info_ptr;
uch *image_data;
uch **row_pointers;
char *title;
char *author;
char *desc;
char *copyright;
char *email;
char *url;
int filter; /* command-line-filter flag, not PNG row filter! */
int pnmtype;
int sample_depth;
int interlaced;
int have_bg;
int have_time;
int have_text;
jmp_buf jmpbuf;
uch bg_red;
uch bg_green;
uch bg_blue;
} mainprog_info;
/* prototypes for public functions in writepng.c */
void writepng_version_info(void);
int writepng_init(mainprog_info *mainprog_ptr);
int writepng_encode_image(mainprog_info *mainprog_ptr);
int writepng_encode_row(mainprog_info *mainprog_ptr);
int writepng_encode_finish(mainprog_info *mainprog_ptr);
void writepng_cleanup(mainprog_info *mainprog_ptr);

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/* Fake a PNG - just write it out directly. */
#include <stdio.h>
#include <zlib.h> /* for crc32 */
void
put_uLong(uLong val)
{
putchar(val >> 24);
putchar(val >> 16);
putchar(val >> 8);
putchar(val >> 0);
}
void
put_chunk(const unsigned char *chunk, uInt length)
{
uLong crc;
put_uLong(length-4); /* Exclude the tag */
fwrite(chunk, length, 1, stdout);
crc = crc32(0, Z_NULL, 0);
put_uLong(crc32(crc, chunk, length));
}
const unsigned char signature[] =
{
137, 80, 78, 71, 13, 10, 26, 10
};
const unsigned char IHDR[] =
{
73, 72, 68, 82, /* IHDR */
0, 0, 0, 1, /* width */
0, 0, 0, 1, /* height */
1, /* bit depth */
0, /* color type: greyscale */
0, /* compression method */
0, /* filter method */
0 /* interlace method: none */
};
const unsigned char unknown[] =
{
'u', 'n', 'K', 'n' /* "unKn" - private safe to copy */
};
int
main(void)
{
fwrite(signature, sizeof signature, 1, stdout);
put_chunk(IHDR, sizeof IHDR);
for (;;)
put_chunk(unknown, sizeof unknown);
}

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#!/bin/sh
#
# Copyright (c) 2013 John Cunningham Bowler
#
# Last changed in libpng 1.6.0 [February 14, 2013]
#
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h
#
# Generate a set of PNG test images. The images are generated in a
# sub-directory called 'tests' by default, however a command line argument will
# change that name. The generation requires a built version of makepng in the
# current directory.
#
usage(){
exec >&2
echo "$0 [<directory>]"
echo ' Generate a set of PNG test files in "directory" ("tests" by default)'
exit 1
}
mp="$PWD/makepng"
test -x "$mp" || {
exec >&2
echo "$0: the 'makepng' program must exist"
echo " in the directory within which this program:"
echo " $mp"
echo " is executed"
usage
}
# Just one argument: the directory
testdir="tests"
test $# -gt 1 && {
testdir="$1"
shift
}
test $# -eq 0 || usage
# Take care not to clobber something
if test -e "$testdir"
then
test -d "$testdir" || usage
else
# mkdir -p isn't portable, so do the following
mkdir "$testdir" 2>/dev/null || mkdir -p "$testdir" || usage
fi
# This fails in a very satisfactory way if it's not accessible
cd "$testdir"
:>"test$$.png" || {
exec >&2
echo "$testdir: directory not writable"
usage
}
rm "test$$.png" || {
exec >&2
echo "$testdir: you have create but not write privileges here."
echo " This is unexpected. You have a spurion; "'"'"test$$.png"'"'"."
echo " You need to remove this yourself. Try a different directory."
exit 1
}
# Now call makepng ($mp) to create every file we can think of with a
# reasonable name
doit(){
for gamma in "" --sRGB --linear --1.8
do
case "$gamma" in
"")
gname=;;
--sRGB)
gname="-srgb";;
--linear)
gname="-lin";;
--1.8)
gname="-18";;
*)
gname="-$gamma";;
esac
"$mp" $gamma "$1" "$2" "test-$1-$2$gname.png"
done
}
#
for ct in gray palette
do
for bd in 1 2 4 8
do
doit "$ct" "$bd"
done
done
#
doit "gray" "16"
#
for ct in gray-alpha rgb rgb-alpha
do
for bd in 8 16
do
doit "$ct" "$bd"
done
done

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/* readpng.c
*
* Copyright (c) 2013 John Cunningham Bowler
*
* Last changed in libpng 1.6.1 [March 28, 2013]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Load an arbitrary number of PNG files (from the command line, or, if there
* are no arguments on the command line, from stdin) then run a time test by
* reading each file by row. The test does nothing with the read result and
* does no transforms. The only output is a time as a floating point number of
* seconds with 9 decimal digits.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
# include <config.h>
#endif
/* Define the following to use this test against your installed libpng, rather
* than the one being built here:
*/
#ifdef PNG_FREESTANDING_TESTS
# include <png.h>
#else
# include "../../png.h"
#endif
static int
read_png(FILE *fp)
{
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
png_infop info_ptr = NULL;
png_bytep row = NULL, display = NULL;
if (png_ptr == NULL)
return 0;
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (row != NULL) free(row);
if (display != NULL) free(display);
return 0;
}
png_init_io(png_ptr, fp);
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
png_error(png_ptr, "OOM allocating info structure");
png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0);
png_read_info(png_ptr, info_ptr);
{
png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
row = malloc(rowbytes);
display = malloc(rowbytes);
if (row == NULL || display == NULL)
png_error(png_ptr, "OOM allocating row buffers");
{
png_uint_32 height = png_get_image_height(png_ptr, info_ptr);
int passes = png_set_interlace_handling(png_ptr);
int pass;
png_start_read_image(png_ptr);
for (pass = 0; pass < passes; ++pass)
{
png_uint_32 y = height;
/* NOTE: this trashes the row each time; interlace handling won't
* work, but this avoids memory thrashing for speed testing.
*/
while (y-- > 0)
png_read_row(png_ptr, row, display);
}
}
}
/* Make sure to read to the end of the file: */
png_read_end(png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(row);
free(display);
return 1;
}
int
main(void)
{
/* Exit code 0 on success. */
return !read_png(stdin);
}

999
src/third-party/libpng/contrib/libtests/tarith.c vendored Normal file
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@ -0,0 +1,999 @@
/* tarith.c
*
* Copyright (c) 2011-2013 John Cunningham Bowler
*
* Last changed in libpng 1.6.0 [February 14, 2013]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Test internal arithmetic functions of libpng.
*
* This code must be linked against a math library (-lm), but does not require
* libpng or zlib to work. Because it includes the complete source of 'png.c'
* it tests the code with whatever compiler options are used to build it.
* Changing these options can substantially change the errors in the
* calculations that the compiler chooses!
*/
#define _POSIX_SOURCE 1
#define _ISOC99_SOURCE 1
/* Obtain a copy of the code to be tested (plus other things), disabling
* stuff that is not required.
*/
#include <math.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <assert.h>
#include "../../pngpriv.h"
#define png_error png_warning
void png_warning(png_const_structrp png_ptr, png_const_charp msg)
{
fprintf(stderr, "validation: %s\n", msg);
}
#define png_fixed_error png_fixed_warning
void png_fixed_warning(png_const_structrp png_ptr, png_const_charp msg)
{
fprintf(stderr, "overflow in: %s\n", msg);
}
#define png_set_error_fn(pp, ep, efp, wfp) ((void)0)
#define png_malloc(pp, s) malloc(s)
#define png_malloc_warn(pp, s) malloc(s)
#define png_malloc_base(pp, s) malloc(s)
#define png_calloc(pp, s) calloc(1, (s))
#define png_free(pp, s) free(s)
#define png_safecat(b, sb, pos, str) (pos)
#define png_format_number(start, end, format, number) (start)
#define crc32(crc, pp, s) (crc)
#define inflateReset(zs) Z_OK
#define png_create_struct(type) (0)
#define png_destroy_struct(pp) ((void)0)
#define png_create_struct_2(type, m, mm) (0)
#define png_destroy_struct_2(pp, f, mm) ((void)0)
#undef PNG_SIMPLIFIED_READ_SUPPORTED
#undef PNG_SIMPLIFIED_WRITE_SUPPORTED
#undef PNG_USER_MEM_SUPPORTED
#include "../../png.c"
/* Validate ASCII to fp routines. */
static int verbose = 0;
int validation_ascii_to_fp(int count, int argc, char **argv)
{
int showall = 0;
double max_error=2; /* As a percentage error-in-last-digit/.5 */
double max_error_abs=17; /* Used when precision is DBL_DIG */
double max = 0;
double max_abs = 0;
double test = 0; /* Important to test this. */
int precision = 5;
int nonfinite = 0;
int finite = 0;
int ok = 0;
int failcount = 0;
int minorarith = 0;
while (--argc > 0)
if (strcmp(*++argv, "-a") == 0)
showall = 1;
else if (strcmp(*argv, "-e") == 0 && argc > 0)
{
--argc;
max_error = atof(*++argv);
}
else if (strcmp(*argv, "-E") == 0 && argc > 0)
{
--argc;
max_error_abs = atof(*++argv);
}
else
{
fprintf(stderr, "unknown argument %s\n", *argv);
return 1;
}
do
{
png_size_t index;
int state, failed = 0;
char buffer[64];
if (isfinite(test))
++finite;
else
++nonfinite;
if (verbose)
fprintf(stderr, "%.*g %d\n", DBL_DIG, test, precision);
/* Check for overflow in the buffer by setting a marker. */
memset(buffer, 71, sizeof buffer);
png_ascii_from_fp(0, buffer, precision+10, test, precision);
/* Allow for a three digit exponent, this stuff will fail if
* the exponent is bigger than this!
*/
if (buffer[precision+7] != 71)
{
fprintf(stderr, "%g[%d] -> '%s'[%lu] buffer overflow\n", test,
precision, buffer, (unsigned long)strlen(buffer));
failed = 1;
}
/* Following are used for the number parser below and must be
* initialized to zero.
*/
state = 0;
index = 0;
if (!isfinite(test))
{
/* Expect 'inf' */
if (test >= 0 && strcmp(buffer, "inf") ||
test < 0 && strcmp(buffer, "-inf"))
{
fprintf(stderr, "%g[%d] -> '%s' but expected 'inf'\n", test,
precision, buffer);
failed = 1;
}
}
else if (!png_check_fp_number(buffer, precision+10, &state, &index) ||
buffer[index] != 0)
{
fprintf(stderr, "%g[%d] -> '%s' but has bad format ('%c')\n", test,
precision, buffer, buffer[index]);
failed = 1;
}
else if (PNG_FP_IS_NEGATIVE(state) && !(test < 0))
{
fprintf(stderr, "%g[%d] -> '%s' but negative value not so reported\n",
test, precision, buffer);
failed = 1;
assert(!PNG_FP_IS_ZERO(state));
assert(!PNG_FP_IS_POSITIVE(state));
}
else if (PNG_FP_IS_ZERO(state) && !(test == 0))
{
fprintf(stderr, "%g[%d] -> '%s' but zero value not so reported\n",
test, precision, buffer);
failed = 1;
assert(!PNG_FP_IS_NEGATIVE(state));
assert(!PNG_FP_IS_POSITIVE(state));
}
else if (PNG_FP_IS_POSITIVE(state) && !(test > 0))
{
fprintf(stderr, "%g[%d] -> '%s' but postive value not so reported\n",
test, precision, buffer);
failed = 1;
assert(!PNG_FP_IS_NEGATIVE(state));
assert(!PNG_FP_IS_ZERO(state));
}
else
{
/* Check the result against the original. */
double out = atof(buffer);
double change = fabs((out - test)/test);
double allow = .5/pow(10,
(precision >= DBL_DIG) ? DBL_DIG-1 : precision-1);
/* NOTE: if you hit this error case are you compiling with gcc
* and -O0? Try -O2 - the errors can accumulate if the FP
* code above is not optimized and may drift outside the .5 in
* DBL_DIG allowed. In any case a small number of errors may
* occur (very small ones - 1 or 2%) because of rounding in the
* calculations, either in the conversion API or in atof.
*/
if (change >= allow && (isfinite(out) ||
fabs(test/DBL_MAX) <= 1-allow))
{
double percent = (precision >= DBL_DIG) ? max_error_abs : max_error;
double allowp = (change-allow)*100/allow;
if (precision >= DBL_DIG)
{
if (max_abs < allowp) max_abs = allowp;
}
else
{
if (max < allowp) max = allowp;
}
if (showall || allowp >= percent)
{
fprintf(stderr,
"%.*g[%d] -> '%s' -> %.*g number changed (%g > %g (%d%%))\n",
DBL_DIG, test, precision, buffer, DBL_DIG, out, change, allow,
(int)round(allowp));
failed = 1;
}
else
++minorarith;
}
}
if (failed)
++failcount;
else
++ok;
skip:
/* Generate a new number and precision. */
precision = rand();
if (precision & 1) test = -test;
precision >>= 1;
/* Generate random numbers. */
if (test == 0 || !isfinite(test))
test = precision+1;
else
{
/* Derive the exponent from the previous rand() value. */
int exponent = precision % (DBL_MAX_EXP - DBL_MIN_EXP) + DBL_MIN_EXP;
int tmp;
test = frexp(test * rand(), &tmp);
test = ldexp(test, exponent);
precision >>= 8; /* arbitrary */
}
/* This limits the precision to 32 digits, enough for standard
* IEEE implementations which have at most 15 digits.
*/
precision = (precision & 0x1f) + 1;
}
while (--count);
printf("Tested %d finite values, %d non-finite, %d OK (%d failed) %d minor "
"arithmetic errors\n", finite, nonfinite, ok, failcount, minorarith);
printf(" Error with >=%d digit precision %.2f%%\n", DBL_DIG, max_abs);
printf(" Error with < %d digit precision %.2f%%\n", DBL_DIG, max);
return 0;
}
/* Observe that valid FP numbers have the forms listed in the PNG extensions
* specification:
*
* [+,-]{integer,integer.fraction,.fraction}[{e,E}[+,-]integer]
*
* Test each of these in turn, including invalid cases.
*/
typedef enum checkfp_state
{
start, fraction, exponent, states
} checkfp_state;
/* The characters (other than digits) that characterize the states: */
static const char none[] = "";
static const char hexdigits[16] = "0123456789ABCDEF";
static const struct
{
const char *start; /* Characters valid at the start */
const char *end; /* Valid characters that end the state */
const char *tests; /* Characters to test after 2 digits seen */
}
state_characters[states] =
{
/* start: */ { "+-.", ".eE", "+-.e*0369" },
/* fraction: */ { none, "eE", "+-.E#0147" },
/* exponent: */ { "+-", none, "+-.eE^0258" }
};
typedef struct
{
char number[1024]; /* Buffer for number being tested */
int limit; /* Command line limit */
int verbose; /* Shadows global variable */
int ctimes; /* Number of numbers tested */
int cmillions; /* Count of millions of numbers */
int cinvalid; /* Invalid strings checked */
int cnoaccept; /* Characters not accepted */
}
checkfp_command;
typedef struct
{
int cnumber; /* Index into number string */
checkfp_state check_state; /* Current number state */
int at_start; /* At start (first character) of state */
int cdigits_in_state; /* Digits seen in that state */
int limit; /* Limit on same for checking all chars */
int state; /* Current parser state */
int is_negative; /* Number is negative */
int is_zero; /* Number is (still) zero */
int number_was_valid; /* Previous character validity */
}
checkfp_control;
static int check_all_characters(checkfp_command *co, checkfp_control c);
static int check_some_characters(checkfp_command *co, checkfp_control c,
const char *tests);
static int check_one_character(checkfp_command *co, checkfp_control c, int ch)
{
/* Test this character (ch) to ensure the parser does the correct thing.
*/
png_size_t index = 0;
const char test = (char)ch;
const int number_is_valid = png_check_fp_number(&test, 1, &c.state, &index);
const int character_accepted = (index == 1);
if (c.check_state != exponent && isdigit(ch) && ch != '0')
c.is_zero = 0;
if (c.check_state == start && c.at_start && ch == '-')
c.is_negative = 1;
if (isprint(ch))
co->number[c.cnumber++] = (char)ch;
else
{
co->number[c.cnumber++] = '<';
co->number[c.cnumber++] = hexdigits[(ch >> 4) & 0xf];
co->number[c.cnumber++] = hexdigits[ch & 0xf];
co->number[c.cnumber++] = '>';
}
co->number[c.cnumber] = 0;
if (co->verbose > 1)
fprintf(stderr, "%s\n", co->number);
if (++(co->ctimes) == 1000000)
{
if (co->verbose == 1)
fputc('.', stderr);
co->ctimes = 0;
++(co->cmillions);
}
if (!number_is_valid)
++(co->cinvalid);
if (!character_accepted)
++(co->cnoaccept);
/* This should never fail (it's a serious bug if it does): */
if (index != 0 && index != 1)
{
fprintf(stderr, "%s: read beyond end of string (%lu)\n", co->number,
(unsigned long)index);
return 0;
}
/* Validate the new state, note that the PNG_FP_IS_ macros all return
* false unless the number is valid.
*/
if (PNG_FP_IS_NEGATIVE(c.state) !=
(number_is_valid && !c.is_zero && c.is_negative))
{
fprintf(stderr, "%s: negative when it is not\n", co->number);
return 0;
}
if (PNG_FP_IS_ZERO(c.state) != (number_is_valid && c.is_zero))
{
fprintf(stderr, "%s: zero when it is not\n", co->number);
return 0;
}
if (PNG_FP_IS_POSITIVE(c.state) !=
(number_is_valid && !c.is_zero && !c.is_negative))
{
fprintf(stderr, "%s: positive when it is not\n", co->number);
return 0;
}
/* Testing a digit */
if (isdigit(ch))
{
if (!character_accepted)
{
fprintf(stderr, "%s: digit '%c' not accepted\n", co->number, ch);
return 0;
}
if (!number_is_valid)
{
fprintf(stderr, "%s: saw a digit (%c) but number not valid\n",
co->number, ch);
return 0;
}
++c.cdigits_in_state;
c.at_start = 0;
c.number_was_valid = 1;
/* Continue testing characters in this state. Either test all of
* them or, if we have already seen one digit in this state, just test a
* limited set.
*/
if (c.cdigits_in_state < 1)
return check_all_characters(co, c);
else
return check_some_characters(co, c,
state_characters[c.check_state].tests);
}
/* A non-digit; is it allowed here? */
else if (((ch == '+' || ch == '-') && c.check_state != fraction &&
c.at_start) ||
(ch == '.' && c.check_state == start) ||
((ch == 'e' || ch == 'E') && c.number_was_valid &&
c.check_state != exponent))
{
if (!character_accepted)
{
fprintf(stderr, "%s: character '%c' not accepted\n", co->number, ch);
return 0;
}
/* The number remains valid after start of fraction but nowhere else. */
if (number_is_valid && (c.check_state != start || ch != '.'))
{
fprintf(stderr, "%s: saw a non-digit (%c) but number valid\n",
co->number, ch);
return 0;
}
c.number_was_valid = number_is_valid;
/* Check for a state change. When changing to 'fraction' if the number
* is valid at this point set the at_start to false to allow an exponent
* 'e' to come next.
*/
if (c.check_state == start && ch == '.')
{
c.check_state = fraction;
c.at_start = !number_is_valid;
c.cdigits_in_state = 0;
c.limit = co->limit;
return check_all_characters(co, c);
}
else if (c.check_state < exponent && (ch == 'e' || ch == 'E'))
{
c.check_state = exponent;
c.at_start = 1;
c.cdigits_in_state = 0;
c.limit = co->limit;
return check_all_characters(co, c);
}
/* Else it was a sign, and the state doesn't change. */
else
{
if (ch != '-' && ch != '+')
{
fprintf(stderr, "checkfp: internal error (1)\n");
return 0;
}
c.at_start = 0;
return check_all_characters(co, c);
}
}
/* Testing an invalid character */
else
{
if (character_accepted)
{
fprintf(stderr, "%s: character '%c' [0x%.2x] accepted\n", co->number,
ch, ch);
return 0;
}
if (number_is_valid != c.number_was_valid)
{
fprintf(stderr,
"%s: character '%c' [0x%.2x] changed number validity\n", co->number,
ch, ch);
return 0;
}
/* Do nothing - the parser has stuck; return success and keep going with
* the next character.
*/
}
/* Successful return (the caller will try the next character.) */
return 1;
}
static int check_all_characters(checkfp_command *co, checkfp_control c)
{
int ch;
if (c.cnumber+4 < sizeof co->number) for (ch=0; ch<256; ++ch)
{
if (!check_one_character(co, c, ch))
return 0;
}
return 1;
}
static int check_some_characters(checkfp_command *co, checkfp_control c,
const char *tests)
{
int i;
--(c.limit);
if (c.cnumber+4 < sizeof co->number && c.limit >= 0)
{
if (c.limit > 0) for (i=0; tests[i]; ++i)
{
if (!check_one_character(co, c, tests[i]))
return 0;
}
/* At the end check all the characters. */
else
return check_all_characters(co, c);
}
return 1;
}
int validation_checkfp(int count, int argc, char **argv)
{
int result;
checkfp_command command;
checkfp_control control;
command.number[0] = 0;
command.limit = 3;
command.verbose = verbose;
command.ctimes = 0;
command.cmillions = 0;
command.cinvalid = 0;
command.cnoaccept = 0;
while (--argc > 0)
{
++argv;
if (argc > 1 && strcmp(*argv, "-l") == 0)
{
--argc;
command.limit = atoi(*++argv);
}
else
{
fprintf(stderr, "unknown argument %s\n", *argv);
return 1;
}
}
control.cnumber = 0;
control.check_state = start;
control.at_start = 1;
control.cdigits_in_state = 0;
control.limit = command.limit;
control.state = 0;
control.is_negative = 0;
control.is_zero = 1;
control.number_was_valid = 0;
result = check_all_characters(&command, control);
printf("checkfp: %s: checked %d,%.3d,%.3d,%.3d strings (%d invalid)\n",
result ? "pass" : "FAIL", command.cmillions / 1000,
command.cmillions % 1000, command.ctimes / 1000, command.ctimes % 1000,
command.cinvalid);
return result;
}
int validation_muldiv(int count, int argc, char **argv)
{
int tested = 0;
int overflow = 0;
int error = 0;
int error64 = 0;
int passed = 0;
int randbits = 0;
png_uint_32 randbuffer;
png_fixed_point a;
png_int_32 times, div;
while (--argc > 0)
{
fprintf(stderr, "unknown argument %s\n", *++argv);
return 1;
}
/* Find out about the random number generator. */
randbuffer = RAND_MAX;
while (randbuffer != 0) ++randbits, randbuffer >>= 1;
printf("Using random number generator that makes %d bits\n", randbits);
for (div=0; div<32; div += randbits)
randbuffer = (randbuffer << randbits) ^ rand();
a = 0;
times = div = 0;
do
{
png_fixed_point result;
/* NOTE: your mileage may vary, a type is required below that can
* hold 64 bits or more, if floating point is used a 64 bit or
* better mantissa is required.
*/
long long int fp, fpround;
unsigned long hi, lo;
int ok;
/* Check the values, png_64bit_product can only handle positive
* numbers, so correct for that here.
*/
{
long u1, u2;
int n = 0;
if (a < 0) u1 = -a, n = 1; else u1 = a;
if (times < 0) u2 = -times, n = !n; else u2 = times;
png_64bit_product(u1, u2, &hi, &lo);
if (n)
{
/* -x = ~x+1 */
lo = ((~lo) + 1) & 0xffffffff;
hi = ~hi;
if (lo == 0) ++hi;
}
}
fp = a;
fp *= times;
if ((fp & 0xffffffff) != lo || ((fp >> 32) & 0xffffffff) != hi)
{
fprintf(stderr, "png_64bit_product %d * %d -> %lx|%.8lx not %llx\n",
a, times, hi, lo, fp);
++error64;
}
if (div != 0)
{
/* Round - this is C round to zero. */
if ((fp < 0) != (div < 0))
fp -= div/2;
else
fp += div/2;
fp /= div;
fpround = fp;
/* Assume 2's complement here: */
ok = fpround <= PNG_UINT_31_MAX &&
fpround >= -1-(long long int)PNG_UINT_31_MAX;
if (!ok) ++overflow;
}
else
ok = 0, ++overflow, fpround = fp/*misleading*/;
if (verbose)
fprintf(stderr, "TEST %d * %d / %d -> %lld (%s)\n", a, times, div,
fp, ok ? "ok" : "overflow");
++tested;
if (png_muldiv(&result, a, times, div) != ok)
{
++error;
if (ok)
fprintf(stderr, "%d * %d / %d -> overflow (expected %lld)\n", a,
times, div, fp);
else
fprintf(stderr, "%d * %d / %d -> %d (expected overflow %lld)\n", a,
times, div, result, fp);
}
else if (ok && result != fpround)
{
++error;
fprintf(stderr, "%d * %d / %d -> %d not %lld\n", a, times, div, result,
fp);
}
else
++passed;
/* Generate three new values, this uses rand() and rand() only returns
* up to RAND_MAX.
*/
/* CRUDE */
a += times;
times += div;
div = randbuffer;
randbuffer = (randbuffer << randbits) ^ rand();
}
while (--count > 0);
printf("%d tests including %d overflows, %d passed, %d failed (%d 64 bit "
"errors)\n", tested, overflow, passed, error, error64);
return 0;
}
/* When FP is on this just becomes a speed test - compile without FP to get real
* validation.
*/
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
#define LN2 .000010576586617430806112933839 /* log(2)/65536 */
#define L2INV 94548.46219969910586572651 /* 65536/log(2) */
/* For speed testing, need the internal functions too: */
static png_uint_32 png_log8bit(unsigned x)
{
if (x > 0)
return (png_uint_32)floor(.5-log(x/255.)*L2INV);
return 0xffffffff;
}
static png_uint_32 png_log16bit(png_uint_32 x)
{
if (x > 0)
return (png_uint_32)floor(.5-log(x/65535.)*L2INV);
return 0xffffffff;
}
static png_uint_32 png_exp(png_uint_32 x)
{
return (png_uint_32)floor(.5 + exp(x * -LN2) * 0xffffffffU);
}
static png_byte png_exp8bit(png_uint_32 log)
{
return (png_byte)floor(.5 + exp(log * -LN2) * 255);
}
static png_uint_16 png_exp16bit(png_uint_32 log)
{
return (png_uint_16)floor(.5 + exp(log * -LN2) * 65535);
}
#endif /* FLOATING_ARITHMETIC */
int validation_gamma(int argc, char **argv)
{
double gamma[9] = { 2.2, 1.8, 1.52, 1.45, 1., 1/1.45, 1/1.52, 1/1.8, 1/2.2 };
double maxerr;
int i, silent=0, onlygamma=0;
/* Silence the output with -s, just test the gamma functions with -g: */
while (--argc > 0)
if (strcmp(*++argv, "-s") == 0)
silent = 1;
else if (strcmp(*argv, "-g") == 0)
onlygamma = 1;
else
{
fprintf(stderr, "unknown argument %s\n", *argv);
return 1;
}
if (!onlygamma)
{
/* First validate the log functions: */
maxerr = 0;
for (i=0; i<256; ++i)
{
double correct = -log(i/255.)/log(2.)*65536;
double error = png_log8bit(i) - correct;
if (i != 0 && fabs(error) > maxerr)
maxerr = fabs(error);
if (i == 0 && png_log8bit(i) != 0xffffffff ||
i != 0 && png_log8bit(i) != floor(correct+.5))
{
fprintf(stderr, "8 bit log error: %d: got %u, expected %f\n",
i, png_log8bit(i), correct);
}
}
if (!silent)
printf("maximum 8 bit log error = %f\n", maxerr);
maxerr = 0;
for (i=0; i<65536; ++i)
{
double correct = -log(i/65535.)/log(2.)*65536;
double error = png_log16bit(i) - correct;
if (i != 0 && fabs(error) > maxerr)
maxerr = fabs(error);
if (i == 0 && png_log16bit(i) != 0xffffffff ||
i != 0 && png_log16bit(i) != floor(correct+.5))
{
if (error > .68) /* By experiment error is less than .68 */
{
fprintf(stderr, "16 bit log error: %d: got %u, expected %f"
" error: %f\n", i, png_log16bit(i), correct, error);
}
}
}
if (!silent)
printf("maximum 16 bit log error = %f\n", maxerr);
/* Now exponentiations. */
maxerr = 0;
for (i=0; i<=0xfffff; ++i)
{
double correct = exp(-i/65536. * log(2.)) * (65536. * 65536);
double error = png_exp(i) - correct;
if (fabs(error) > maxerr)
maxerr = fabs(error);
if (fabs(error) > 1883) /* By experiment. */
{
fprintf(stderr, "32 bit exp error: %d: got %u, expected %f"
" error: %f\n", i, png_exp(i), correct, error);
}
}
if (!silent)
printf("maximum 32 bit exp error = %f\n", maxerr);
maxerr = 0;
for (i=0; i<=0xfffff; ++i)
{
double correct = exp(-i/65536. * log(2.)) * 255;
double error = png_exp8bit(i) - correct;
if (fabs(error) > maxerr)
maxerr = fabs(error);
if (fabs(error) > .50002) /* By experiment */
{
fprintf(stderr, "8 bit exp error: %d: got %u, expected %f"
" error: %f\n", i, png_exp8bit(i), correct, error);
}
}
if (!silent)
printf("maximum 8 bit exp error = %f\n", maxerr);
maxerr = 0;
for (i=0; i<=0xfffff; ++i)
{
double correct = exp(-i/65536. * log(2.)) * 65535;
double error = png_exp16bit(i) - correct;
if (fabs(error) > maxerr)
maxerr = fabs(error);
if (fabs(error) > .524) /* By experiment */
{
fprintf(stderr, "16 bit exp error: %d: got %u, expected %f"
" error: %f\n", i, png_exp16bit(i), correct, error);
}
}
if (!silent)
printf("maximum 16 bit exp error = %f\n", maxerr);
} /* !onlygamma */
/* Test the overall gamma correction. */
for (i=0; i<9; ++i)
{
unsigned j;
double g = gamma[i];
png_fixed_point gfp = floor(g * PNG_FP_1 + .5);
if (!silent)
printf("Test gamma %f\n", g);
maxerr = 0;
for (j=0; j<256; ++j)
{
double correct = pow(j/255., g) * 255;
png_byte out = png_gamma_8bit_correct(j, gfp);
double error = out - correct;
if (fabs(error) > maxerr)
maxerr = fabs(error);
if (out != floor(correct+.5))
{
fprintf(stderr, "8bit %d ^ %f: got %d expected %f error %f\n",
j, g, out, correct, error);
}
}
if (!silent)
printf("gamma %f: maximum 8 bit error %f\n", g, maxerr);
maxerr = 0;
for (j=0; j<65536; ++j)
{
double correct = pow(j/65535., g) * 65535;
png_uint_16 out = png_gamma_16bit_correct(j, gfp);
double error = out - correct;
if (fabs(error) > maxerr)
maxerr = fabs(error);
if (fabs(error) > 1.62)
{
fprintf(stderr, "16bit %d ^ %f: got %d expected %f error %f\n",
j, g, out, correct, error);
}
}
if (!silent)
printf("gamma %f: maximum 16 bit error %f\n", g, maxerr);
}
return 0;
}
/**************************** VALIDATION TESTS ********************************/
/* Various validation routines are included herein, they require some
* definition for png_warning and png_error, seetings of VALIDATION:
*
* 1: validates the ASCII to floating point conversions
* 2: validates png_muldiv
* 3: accuracy test of fixed point gamma tables
*/
/* The following COUNT (10^8) takes about 1 hour on a 1GHz Pentium IV
* processor.
*/
#define COUNT 1000000000
int main(int argc, char **argv)
{
int count = COUNT;
while (argc > 1)
{
if (argc > 2 && strcmp(argv[1], "-c") == 0)
{
count = atoi(argv[2]);
argc -= 2;
argv += 2;
}
else if (strcmp(argv[1], "-v") == 0)
{
++verbose;
--argc;
++argv;
}
else
break;
}
if (count > 0 && argc > 1)
{
if (strcmp(argv[1], "ascii") == 0)
return validation_ascii_to_fp(count, argc-1, argv+1);
else if (strcmp(argv[1], "checkfp") == 0)
return validation_checkfp(count, argc-1, argv+1);
else if (strcmp(argv[1], "muldiv") == 0)
return validation_muldiv(count, argc-1, argv+1);
else if (strcmp(argv[1], "gamma") == 0)
return validation_gamma(argc-1, argv+1);
}
/* Bad argument: */
fprintf(stderr,
"usage: tarith [-v] [-c count] {ascii,muldiv,gamma} [args]\n");
fprintf(stderr, " arguments: ascii [-a (all results)] [-e error%%]\n");
fprintf(stderr, " checkfp [-l max-number-chars]\n");
fprintf(stderr, " muldiv\n");
fprintf(stderr, " gamma -s (silent) -g (only gamma; no log)\n");
return 1;
}

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/* timepng.c
*
* Copyright (c) 2013 John Cunningham Bowler
*
* Last changed in libpng 1.6.1 [March 28, 2013]
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Load an arbitrary number of PNG files (from the command line, or, if there
* are no arguments on the command line, from stdin) then run a time test by
* reading each file by row. The test does nothing with the read result and
* does no transforms. The only output is a time as a floating point number of
* seconds with 9 decimal digits.
*/
#define _POSIX_C_SOURCE 199309L /* for clock_gettime */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
# include <config.h>
#endif
/* Define the following to use this test against your installed libpng, rather
* than the one being built here:
*/
#ifdef PNG_FREESTANDING_TESTS
# include <png.h>
#else
# include "../../png.h"
#endif
static int read_png(FILE *fp)
{
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
png_infop info_ptr = NULL;
png_bytep row = NULL, display = NULL;
if (png_ptr == NULL)
return 0;
if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
if (row != NULL) free(row);
if (display != NULL) free(display);
return 0;
}
png_init_io(png_ptr, fp);
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL)
png_error(png_ptr, "OOM allocating info structure");
png_read_info(png_ptr, info_ptr);
{
png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
row = malloc(rowbytes);
display = malloc(rowbytes);
if (row == NULL || display == NULL)
png_error(png_ptr, "OOM allocating row buffers");
{
png_uint_32 height = png_get_image_height(png_ptr, info_ptr);
int passes = png_set_interlace_handling(png_ptr);
int pass;
png_start_read_image(png_ptr);
for (pass = 0; pass < passes; ++pass)
{
png_uint_32 y = height;
/* NOTE: this trashes the row each time; interlace handling won't
* work, but this avoids memory thrashing for speed testing.
*/
while (y-- > 0)
png_read_row(png_ptr, row, display);
}
}
}
/* Make sure to read to the end of the file: */
png_read_end(png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(row);
free(display);
return 1;
}
static int mytime(struct timespec *t)
{
/* Do the timing using clock_gettime and the per-process timer. */
if (!clock_gettime(CLOCK_PROCESS_CPUTIME_ID, t))
return 1;
perror("CLOCK_PROCESS_CPUTIME_ID");
fprintf(stderr, "timepng: could not get the time\n");
return 0;
}
static int perform_one_test(FILE *fp, int nfiles)
{
int i;
struct timespec before, after;
/* Clear out all errors: */
rewind(fp);
if (mytime(&before))
{
for (i=0; i<nfiles; ++i)
{
if (read_png(fp))
{
if (ferror(fp))
{
perror("temporary file");
fprintf(stderr, "file %d: error reading PNG data\n", i);
return 0;
}
}
else
{
perror("temporary file");
fprintf(stderr, "file %d: error from libpng\n", i);
return 0;
}
}
}
else
return 0;
if (mytime(&after))
{
/* Work out the time difference and print it - this is the only output,
* so flush it immediately.
*/
unsigned long s = after.tv_sec - before.tv_sec;
long ns = after.tv_nsec - before.tv_nsec;
if (ns < 0)
{
--s;
ns += 1000000000;
if (ns < 0)
{
fprintf(stderr, "timepng: bad clock from kernel\n");
return 0;
}
}
printf("%lu.%.9ld\n", s, ns);
fflush(stdout);
if (ferror(stdout))
{
fprintf(stderr, "timepng: error writing output\n");
return 0;
}
/* Successful return */
return 1;
}
else
return 0;
}
static int add_one_file(FILE *fp, char *name)
{
FILE *ip = fopen(name, "rb");
if (ip != NULL)
{
int ch;
for (;;)
{
ch = getc(ip);
if (ch == EOF) break;
putc(ch, fp);
}
if (ferror(ip))
{
perror(name);
fprintf(stderr, "%s: read error\n", name);
return 0;
}
(void)fclose(ip);
if (ferror(fp))
{
perror("temporary file");
fprintf(stderr, "temporary file write error\n");
return 0;
}
}
else
{
perror(name);
fprintf(stderr, "%s: open failed\n", name);
return 0;
}
return 1;
}
int main(int argc, char **argv)
{
int ok = 0;
FILE *fp = tmpfile();
if (fp != NULL)
{
int err = 0;
int nfiles = 0;
if (argc > 1)
{
int i;
for (i=1; i<argc; ++i)
{
if (add_one_file(fp, argv[i]))
++nfiles;
else
{
err = 1;
break;
}
}
}
else
{
char filename[FILENAME_MAX+1];
while (fgets(filename, FILENAME_MAX+1, stdin))
{
size_t len = strlen(filename);
if (filename[len-1] == '\n')
{
filename[len-1] = 0;
if (add_one_file(fp, filename))
++nfiles;
else
{
err = 1;
break;
}
}
else
{
fprintf(stderr, "timepng: truncated file name ...%s\n",
filename+len-32);
err = 1;
break;
}
}
if (ferror(stdin))
{
fprintf(stderr, "timepng: stdin: read error\n");
err = 1;
}
}
if (!err)
{
if (nfiles > 0)
ok = perform_one_test(fp, nfiles);
else
fprintf(stderr, "usage: timepng {files} or ls files | timepng\n");
}
(void)fclose(fp);
}
else
fprintf(stderr, "timepng: could not open temporary file\n");
/* Exit code 0 on success. */
return ok == 0;
}

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This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
to build minimal decoder, encoder, and progressive reader applications.
See the individual README and pngusr.dfa files for more explanation.

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This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa
The makefile builds a minimal read-only decoder with embedded libpng
and zlib.
Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
on the make command line.
If you prefer to use the shared libraries, go to contrib/pngminus
and build the png2pnm application there.

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# Makefile for PngMinus (pngm2pnm)
# Linux / Unix
#CC=cc
CC=gcc
LD=$(CC)
# If awk fails try
# make AWK=nawk
# If cpp fails try
# make CPP=/lib/cpp
RM=rm -f
COPY=cp
CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
CFLAGS=-O1 -Wall
C=.c
O=.o
L=.a
E=
# Where to find the source code:
PNGSRC =../../..
ZLIBSRC=$(PNGSRC)/../zlib
PROGSRC=$(PNGSRC)/contrib/pngminus
# Zlib (minimal inflate requirements - crc32 is used by libpng)
# zutil can be eliminated if you provide your own zcalloc and zcfree
ZSRCS = adler32$(C) crc32$(C) \
inffast$(C) inflate$(C) inftrees$(C) \
zutil$(C)
# Standard headers
ZH = zlib.h crc32.h inffast.h inffixed.h \
inflate.h inftrees.h zutil.h
# Machine generated headers
ZCONF = zconf.h
# Headers callers use
ZINC = zlib.h $(ZCONF)
# Headers the Zlib source uses
ZHDRS = $(ZH) $(ZCONF)
ZOBJS = adler32$(O) crc32$(O) \
inffast$(O) inflate$(O) inftrees$(O) \
zutil$(O)
# libpng
PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
pngset$(C) pngtrans$(C)
# Standard headers
PNGH =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
# Machine generated headers
PNGCONF=pnglibconf.h
# Headers callers use
PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
# Headers the PNG library uses
PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
pngset$(O) pngtrans$(O)
PROGSRCS= pngm2pnm$(C)
PROGHDRS=
PROGDOCS=
PROGOBJS= pngm2pnm$(O)
OBJS = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
# implicit make rules -------------------------------------------------------
# note: dependencies do not work on implicit rule lines
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies
all: pngm2pnm$(E)
pngm2pnm$(E): $(OBJS)
$(LD) -o pngm2pnm$(E) $(OBJS)
# The DFA_XTRA setting turns all libpng options off then
# turns on those required for this minimal build.
# The CPP_FLAGS setting causes pngusr.h to be included in
# both the build of pnglibconf.h and, subsequently, when
# building libpng itself.
$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
$(PNGSRC)/scripts/pnglibconf.dfa \
$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
$(RM) pnglibconf.h pnglibconf.dfn
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
DFA_XTRA="pngusr.dfa" $@
clean:
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) clean
$(RM) pngm2pnm$(O)
$(RM) pngm2pnm$(E)
$(RM) $(OBJS)
# distclean also removes the copied source and headers
distclean: clean
$(RM) -r scripts # historical reasons
$(RM) $(PNGSRCS) $(PNGH)
$(RM) $(ZSRCS) $(ZH) $(ZCONF)
$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
# Header file dependencies:
$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
$(PNGOBJS): $(PNGHDRS) $(ZINC)
$(ZOBJS): $(ZHDRS)
# Gather the source code from the respective directories
$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
$(RM) $@
$(COPY) $(PNGSRC)/$@ $@
# No dependency on the ZLIBSRC target so that it only needs
# to be specified once.
$(ZSRCS) $(ZH):
$(RM) $@
$(COPY) $(ZLIBSRC)/$@ $@
# The unconfigured zconf.h varies in name according to the
# zlib release
$(ZCONF):
$(RM) $@
@for f in zconf.h.in zconf.in.h zconf.h; do\
test -r $(ZLIBSRC)/$$f &&\
echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
$(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
pngm2pnm.c: $(PROGSRC)/png2pnm.c
$(RM) $@
$(COPY) $(PROGSRC)/png2pnm.c $@
# End of makefile for pngm2pnm

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# pngminim/decoder/pngusr.dfa
#
# Copyright (c) 2010-2013 Glenn Randers-Pehrson
#
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h
# First all the build options off:
everything = off
# All that is required is some read code. This example switches
# on the sequential read code (see ../preader for a progressive
# read example).
option SEQUENTIAL_READ on
# You must choose fixed or floating point arithmetic:
# option FLOATING_POINT on
option FIXED_POINT on
# You must chose the internal fixed point implementation or to
# use the system floating point. The latter is considerably
# smaller (by about 1kbyte on an x86 system):
# option FLOATING_ARITHMETIC on
option FLOATING_ARITHMETIC off
# Your program will probably need other options. The example
# program here, pngm2pnm, requires the following. Take a look
# at pnglibconf.h to find out the full set of what has to be
# enabled to make the following work.
option SETJMP on
option STDIO on
option READ_EXPAND on
option READ_STRIP_16_TO_8 on
option USER_LIMITS on

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/* minrdpngconf.h: headers to make a minimal png-read-only library
*
* Copyright (c) 2007, 2010-2013 Glenn Randers-Pehrson
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
*/
#ifndef MINRDPNGCONF_H
#define MINRDPNGCONF_H
/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
/* List options to turn off features of the build that do not
* affect the API (so are not recorded in pnglibconf.h)
*/
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINRDPNGCONF_H */

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This demonstrates the use of PNG_USER_CONFIG and pngusr.h
The makefile builds a minimal write-only encoder with embedded libpng
and zlib.
Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
on the make command line.
If you prefer to use the shared libraries, go to contrib/pngminus
and build the pnm2png application there.

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# Makefile for PngMinus (pnm2pngm)
# Linux / Unix
#CC=cc
CC=gcc
LD=$(CC)
# If awk fails try
# make AWK=nawk
# If cpp fails try
# make CPP=/lib/cpp
RM=rm -f
COPY=cp
CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
CFLAGS=-O1 -Wall
C=.c
O=.o
L=.a
E=
# Where to find the source code:
PNGSRC =../../..
ZLIBSRC=$(PNGSRC)/../zlib
PROGSRC=$(PNGSRC)/contrib/pngminus
# Zlib
ZSRCS = adler32$(C) compress$(C) crc32$(C) deflate$(C) \
trees$(C) zutil$(C)
# Standard headers
#ZH = zlib.h crc32.h deflate.h trees.h zutil.h
ZH = zlib.h crc32.h deflate.h trees.h zutil.h
# Machine generated headers
ZCONF = zconf.h
# Headers callers use
ZINC = zlib.h $(ZCONF)
# Headers the Zlib source uses
ZHDRS = $(ZH) $(ZCONF)
# compress is not required; it is needed to link the zlib
# code because deflate defines an unused API function deflateBound
# which itself calls compressBound from compress.
ZOBJS = adler32$(O) compress$(O) crc32$(O) deflate$(O) \
trees$(O) zutil$(O)
# libpng
PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \
pngwtran$(C) pngwutil$(C)
# Standard headers
PNGH =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
# Machine generated headers
PNGCONF=pnglibconf.h
# Headers callers use
PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
# Headers the PNG library uses
PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \
pngwtran$(O) pngwutil$(O)
PROGSRCS= pnm2pngm$(C)
PROGHDRS=
PROGDOCS=
PROGOBJS= pnm2pngm$(O)
OBJS = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies
all: pnm2pngm$(E)
pnm2pngm$(E): $(OBJS)
$(LD) -o pnm2pngm$(E) $(OBJS)
# The DFA_XTRA setting turns all libpng options off then
# turns on those required for this minimal build.
# The CPP_FLAGS setting causes pngusr.h to be included in
# both the build of pnglibconf.h and, subsequently, when
# building libpng itself.
$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
$(PNGSRC)/scripts/pnglibconf.dfa \
$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
$(RM) pnglibconf.h pnglibconf.dfn
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
DFA_XTRA="pngusr.dfa" $@
clean:
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) clean
$(RM) pnm2pngm$(O)
$(RM) pnm2pngm$(E)
$(RM) $(OBJS)
# distclean also removes the copied source and headers
distclean: clean
$(RM) -r scripts # historical reasons
$(RM) $(PNGSRCS) $(PNGH)
$(RM) $(ZSRCS) $(ZH) $(ZCONF)
$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
# Header file dependencies:
$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
$(PNGOBJS): $(PNGHDRS) $(ZINC)
$(ZOBJS): $(ZHDRS)
# Gather the source code from the respective directories
$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
$(RM) $@
$(COPY) $(PNGSRC)/$@ $@
# No dependency on the ZLIBSRC target so that it only needs
# to be specified once.
$(ZSRCS) $(ZH):
$(RM) $@
$(COPY) $(ZLIBSRC)/$@ $@
# The unconfigured zconf.h varies in name according to the
# zlib release
$(ZCONF):
$(RM) $@
@for f in zconf.h.in zconf.in.h zconf.h; do\
test -r $(ZLIBSRC)/$$f &&\
echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
$(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
pnm2pngm.c: $(PROGSRC)/pnm2png.c
$(RM) $@
$(COPY) $(PROGSRC)/pnm2png.c $@
# End of makefile for pnm2pngm

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# pngminim/encoder/pngusr.dfa
#
# Copyright (c) 2010-2013 Glenn Randers-Pehrson
#
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h
# First all the build options off:
everything = off
# Switch on the write code - this makes a minimalist encoder
option WRITE on
# These 2 options are required if you need to read PBM (P1 or P4) files.
option WRITE_INVERT on
option WRITE_PACK on
# You must choose fixed or floating point arithmetic:
# option FLOATING_POINT on
option FIXED_POINT on
# You must chose the internal fixed point implementation or to
# use the system floating point. The latter is considerably
# smaller (by about 1kbyte on an x86 system):
# option FLOATING_ARITHMETIC on
option FLOATING_ARITHMETIC off
# Your program will probably need other options. The example
# program here, pnm2pngm, requires the following. Take a look
# at pnglibconf.h to find out the full set of what has to be
# enabled to make the following work.
option SETJMP on
option STDIO on

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/* minwrpngconf.h: headers to make a minimal png-write-only library
*
* Copyright (c) 2007, 2010-2013 Glenn Randers-Pehrson
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
*/
#ifndef MINWRPNGCONF_H
#define MINWRPNGCONF_H
/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
/* List options to turn off features of the build that do not
* affect the API (so are not recorded in pnglibconf.h)
*/
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINWRPNGCONF_H */

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This demonstrates the use of PNG_USER_CONFIG and pngusr.h
The makefile builds a minimal read-only progressive decoder with
embedded libpng, zlib and your system's X library.
Specify the location of the zlib source (1.2.1 or later) as ZLIBSRC
on the make command line.
Edit makefile if required, to find your X library and include files,
then
make ZLIBSRC=directory
If you prefer to use the shared libraries, go to contrib/gregbook
and build the rpng2-x application there.

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# Makefile for PngMinus (rpng2)
# Linux / Unix
#CC=cc
CC=gcc
LD=$(CC)
# If awk fails try
# make AWK=nawk
# If cpp fails try
# make CPP=/lib/cpp
RM=rm -f
COPY=cp
#XINC = -I/usr/include # old-style, stock X distributions
#XLIB = -L/usr/lib/X11 -lX11 # (including SGI IRIX)
#XINC = -I/usr/openwin/include # Sun workstations (OpenWindows)
#XLIB = -L/usr/openwin/lib -lX11
XINC = -I/usr/X11R6/include # new X distributions (X.org, etc.)
XLIB = -L/usr/X11R6/lib -lX11
#XLIB = -L/usr/X11R6/lib64 -lX11 # e.g., Red Hat on AMD64
#XINC = -I/usr/local/include # FreeBSD
#XLIB = -L/usr/local/lib -lX11
#LIBS = $(XLIB)
LIBS = $(XLIB) -lm #platforms that need libm
CPPFLAGS=-I. $(XINC) -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP
CFLAGS=-O1 -Wall
C=.c
O=.o
L=.a
E=
# Where to find the source code:
PNGSRC =../../..
ZLIBSRC=$(PNGSRC)/../zlib
PROGSRC=$(PNGSRC)/contrib/gregbook
# Zlib (minimal inflate requirements - crc32 is used by libpng)
# zutil can be eliminated if you provide your own zcalloc and zcfree
ZSRCS = adler32$(C) crc32$(C) \
inffast$(C) inflate$(C) inftrees$(C) \
zutil$(C)
# Standard headers
ZH = zlib.h crc32.h inffast.h inffixed.h \
inflate.h inftrees.h zutil.h
# Machine generated headers
ZCONF = zconf.h
# Headers callers use
ZINC = zlib.h $(ZCONF)
# Headers the Zlib source uses
ZHDRS = $(ZH) $(ZCONF)
ZOBJS = adler32$(O) crc32$(O) \
inffast$(O) inflate$(O) inftrees$(O) \
zutil$(O)
# libpng
PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \
pngpread$(C) pngread$(C) pngrio$(C) pngrtran$(C) pngrutil$(C) \
pngset$(C) pngtrans$(C)
# Standard headers
PNGH =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
# Machine generated headers
PNGCONF=pnglibconf.h
# Headers callers use
PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)
# Headers the PNG library uses
PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h
PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \
pngpread$(O) pngread$(O) pngrio$(O) pngrtran$(O) pngrutil$(O) \
pngset$(O) pngtrans$(O)
PROGSRCS= rpng2-x$(C) readpng2$(C)
PROGHDRS= readpng2.h
PROGDOCS= COPYING LICENSE
PROGOBJS= rpng2-x$(O) readpng2$(O)
OBJS = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)
# implicit make rules -------------------------------------------------------
.c$(O):
$(CC) -c $(CPPFLAGS) $(CFLAGS) $<
# dependencies
all: $(PROGDOCS) rpng2-x$(E)
rpng2-x$(E): $(OBJS)
$(LD) -o rpng2-x$(E) $(OBJS) $(LIBS)
# The DFA_XTRA setting turns all libpng options off then
# turns on those required for this minimal build.
# The CPP_FLAGS setting causes pngusr.h to be included in
# both the build of pnglibconf.h and, subsequently, when
# building libpng itself.
$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\
$(PNGSRC)/scripts/pnglibconf.dfa \
$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa
$(RM) pnglibconf.h pnglibconf.dfn
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\
DFA_XTRA="pngusr.dfa" $@
clean:
$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\
srcdir=$(PNGSRC) clean
$(RM) rpng2-x$(O)
$(RM) rpng2-x$(E)
$(RM) $(OBJS)
# distclean also removes the copied source and headers
distclean: clean
$(RM) -r scripts # historical reasons
$(RM) $(PNGSRCS) $(PNGH)
$(RM) $(ZSRCS) $(ZH) $(ZCONF)
$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)
# Header file dependencies:
$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)
$(PNGOBJS): $(PNGHDRS) $(ZINC)
$(ZOBJS): $(ZHDRS)
# Gather the source code from the respective directories
$(PNGSRCS) $(PNGH): $(PNGSRC)/$@
$(RM) $@
$(COPY) $(PNGSRC)/$@ $@
# No dependency on the ZLIBSRC target so that it only needs
# to be specified once.
$(ZSRCS) $(ZH):
$(RM) $@
$(COPY) $(ZLIBSRC)/$@ $@
# The unconfigured zconf.h varies in name according to the
# zlib release
$(ZCONF):
$(RM) $@
@for f in zconf.h.in zconf.in.h zconf.h; do\
test -r $(ZLIBSRC)/$$f &&\
echo $(COPY) $(ZLIBSRC)/$$f $@ &&\
$(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\
done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1
$(PROGSRCS) $(PROGHDRS) $(PROGDOCS): $(PROGSRC)/$@
$(RM) $@
$(COPY) $(PROGSRC)/$@ $@
# End of makefile for rpng2-x

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# pngminim/preader/pngusr.dfa
#
# Copyright (c) 2010-2013 Glenn Randers-Pehrson
#
# This code is released under the libpng license.
# For conditions of distribution and use, see the disclaimer
# and license in png.h
# First all the build options off:
everything = off
# Just switch on the progressive read code
option PROGRESSIVE_READ on
# You may choose fixed or floating point APIs:
# option FLOATING_POINT on
option FIXED_POINT on
# You must chose the internal fixed point implementation or to
# use the system floating point. The latter is considerably
# smaller (by about 1kbyte on an x86 system):
option FLOATING_ARITHMETIC on
# option FLOATING_ARITHMETIC off
# Your program will probably need other options. The example
# program here, rpng2-x, requires the following. Take a look
# at pnglibconf.h to find out the full set of what has to be
# enabled to make the following work.
option SETJMP on
option STDIO on
option READ_bKGD on
option READ_GAMMA on
option READ_EXPAND on
option READ_STRIP_16_TO_8 on
option READ_GRAY_TO_RGB on

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/* minrdpngconf.h: headers to make a minimal png-read-only library
*
* Copyright (c) 2009, 2010-2013 Glenn Randers-Pehrson
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* Derived from pngcrush.h, Copyright 1998-2007, Glenn Randers-Pehrson
*/
#ifndef MINPRDPNGCONF_H
#define MINPRDPNGCONF_H
/* To include pngusr.h set -DPNG_USER_CONFIG in CPPFLAGS */
/* List options to turn off features of the build that do not
* affect the API (so are not recorded in pnglibconf.h)
*/
#define PNG_ALIGN_TYPE PNG_ALIGN_NONE
#endif /* MINPRDPNGCONF_H */

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PngMinus
--------
(copyright Willem van Schaik, 1999)
License
-------
Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation. This software is provided "as is" without
express or implied warranty.
Some history
------------
Soon after the creation of PNG in 1995, the need was felt for a set of
pnmtopng / pngtopnm utilities. Independantly Alexander Lehmann and I
(Willem van Schaik) started such a project. Luckily we discovered this
and merged the two together into pnmtopng.tar.gz, which is available
from a/o ftp://ftp.simplesystems.org/pub/libpng/png/.
These two utilities have many, many options and make use of most of the
features of PNG, like gamma, alpha, sbit, text-chunks, etc. This makes
the utilities quite complex and by now not anymore very maintainable.
When we wrote these programs, libpng was still in an early stage.
Therefore, lots of the functionality that we put in our software can now
be done using transform-functions in libpng.
Finally, to compile these programs, you need to have installed and
compiled three libraries: libpng, zlib and netpbm. Especially the latter
makes the whole setup a bit bulky. But that's unavoidable given the many
features of pnmtopng.
What now
--------
At this moment libpng is in a very stable state and can do much of the
work done in pnmtopng. Also, pnmtopng needs to be upgraded to the new
interface of libpng. Hence, it is time for a rewrite from the ground up
of pnmtopng and pngtopnm. This will happen in the near future (stay
tuned). The new package will get a different name to distinguish it from
the old one: PngPlus.
To experiment a bit with the new interface of libpng, I started off with
a small prototype that contains only the basic functionality. It doesn't
have any of the options to read or write special chunks and it will do
no gamma correction. But this makes it also a simple program that is
quite easy to understand and can serve well as a template for other
software developments. (By now there are of course a couple of programs,
like Greg Roelofs' rpng/wpng, that can be used just as good.)
Can and can not
---------------
As this is the small brother of the future PngPlus, I called this fellow
PngMinus. Because I started this development in good-old Turbo-C, I
avoided the use the netpbm library, which requires DOS extenders. Again,
another reason to call it PngMinus (minus netpbm :-). So, part of the
program are some elementary routines to read / write pgm- and ppm-files.
It does not read b&w pbm-files.
The downside of this approach is that you can not use them on images
that require blocks of memory bigger than 64k (the DOS version). For
larger images you will get an out-of-memory error.
As said before, PngMinus doesn't correct for gamma. When reading
png-files you can do this just as well by piping the output of png2pnm
to pnmgamma, one of the standard PbmPlus tools. This same scenario will
most probably also be followed in the full-blown future PngPlus, with
the addition of course of the possibility to create gamma-chunks when
writing png-files.
On the other hand it supports alpha-channels. When reading a png-image
you can write the alpha-channel into a pgm-file. And when creating an
RGB+A png-image, you just combine a ppm-file with a corresponding
pgm-file containing the alpha-channel. When reading, transparency chunks
are converted into an alpha-channel and from there on treated the same
way.
Finally you can opt for writing ascii or binary pgm- and ppm-files. When
the bit-depth is 16, the format will always be ascii.
Using it
--------
To distinguish them from pnmtopng and PngPlus, the utilities are named
png2pnm and pnm2png (2 instead of to). The input- and output-files can
be given as parameters or through redirection. Therefore the programs
can be part of a pipe.
To list the options type "png2pnm -h" or "pnm2png -h".
Just like Scandinavian furniture
--------------------------------
You have to put it together yourself. I did test the software under
MS-DOS with Turbo-C 3.0 and under RedHat Linux 4.2 with gcc. In both
cases I used libpng-1.0.4 and zlib-1.1.3. Later versions should be OK,
however some older libpng versions have a bug in pngmem.c when using
Turbo-C 3.0 (see below).
You can build it using one of the two makefiles (make -f makefile.###)
or use the batch/script files pngminus.bat / pngminus.sh. This assumes
that you have built the libraries in ../libpng and ../zlib. Using Linux,
make sure that you have built libpng with makefile.std and not
makefile.linux (also called .lnx in earlier versions of libpng). The
latter creates a .so shared-library, while the PngMinus makefile assumes
a normal .a static library.
If you create a ../pngsuite directory and then store the basn####.png
files from PngSuite (http://www.schaik.com/pngsuite/) in there, you can
test in one go the proper functioning of PngMinus, see png2pnm.bat and
pnm2png.bat (or the .sh versions).
Warranty
-------
Please, remember that this was just a small experiment to learn a few
things. It will have many unforeseen features <vbg>. Who said bugs? Use
it when you are in need for something simple or when you want to start
developing your own stuff.
The Turbo bug
-------------
** pngmem.old
hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
hptr += 16L;
** pngmem.c
hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
hptr = hptr + 16L;
**
** pngmem.old
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
hptr += (png_uint_32)65536L;
** pngmem.c
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
hptr = hptr + 65536L;
**
The end
-------
Willem van Schaik
mailto:willem@schaik.com
http://www.schaik.com/png/
-------
Oct 1999

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# Makefile for PngMinus (png2pnm and pnm2png)
# Linux / Unix
#CC=cc
CC=gcc
LD=$(CC)
RM=rm -f
#PNGPATH = /usr/local
#PNGINC = -I$(PNGPATH)/include/libpng16
#PNGLIB = -L$(PNGPATH)/lib -lpng16
#PNGLIBS = $(PNGPATH)/lib/libpng16.a
PNGINC = -I../..
PNGLIB = -L../.. -lpng
PNGLIBS = ../../libpng.a
#ZPATH = /usr/local
#ZINC = -I$(ZPATH)/include
#ZLIB = -L$(ZPATH)/lib -lz
#ZLIBS = $(ZPATH)/lib/libz.a
ZINC = -I../../../zlib
ZLIB = -L../../../zlib -lz
ZLIBS = ../../../zlib/libz.a
CPPFLAGS=$(PNGINC) $(ZINC)
CFLAGS=
LDLIBS=$(PNGLIB) $(ZLIB)
LDLIBSS=$(PNGLIBS) $(ZLIBS)
C=.c
O=.o
L=.a
E=
# dependencies
#all: png2pnm$(E) pnm2png$(E)
all: png2pnm$(E) pnm2png$(E) png2pnm-static$(E) pnm2png-static$(E)
png2pnm$(O): png2pnm$(C)
$(CC) -c $(CPPFLAGS) $(CFLAGS) png2pnm$(C)
png2pnm$(E): png2pnm$(O)
$(LD) $(LDFLAGS) -o png2pnm$(E) png2pnm$(O) $(LDLIBS) -lm
png2pnm-static$(E): png2pnm$(O)
$(LD) $(LDFLAGS) -o png2pnm-static$(E) png2pnm$(O) $(LDLIBSS) -lm
pnm2png$(O): pnm2png$(C)
$(CC) -c $(CPPFLAGS) $(CFLAGS) pnm2png$(C)
pnm2png$(E): pnm2png$(O)
$(LD) $(LDFLAGS) -o pnm2png$(E) pnm2png$(O) $(LDLIBS) -lm
pnm2png-static$(E): pnm2png$(O)
$(LD) $(LDFLAGS) -o pnm2png-static$(E) pnm2png$(O) $(LDLIBSS) -lm
clean:
$(RM) png2pnm$(O)
$(RM) pnm2png$(O)
$(RM) png2pnm$(E)
$(RM) pnm2png$(E)
$(RM) png2pnm-static$(E)
$(RM) pnm2png-static$(E)
# End of makefile for png2pnm / pnm2png

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# Makefile for PngMinus (png2pnm and pnm2png)
# TurboC++ 3.0
CC=tcc -Ic:\tc3\inc
LD=tcc -Lc:\tc3\lib
LB=tlib
RM=del
CP=copy
MODEL=l
CPPFLAGS=-I..\libpng -I..\zlib
CFLAGS=-O -m$(MODEL)
LDFLAGS=-m$(MODEL) -L..\libpng -L..\zlib
C=.c
O=.obj
L=.lib
E=.exe
# dependencies
all: png2pnm$(E) pnm2png$(E)
png2pnm$(O): png2pnm$(C)
$(CC) -c $(CPPFLAGS) $(CFLAGS) png2pnm$(C)
png2pnm$(E): png2pnm$(O)
$(LD) $(LDFLAGS) png2pnm$(O) libpng$(L) zlib$(L)
pnm2png$(O): pnm2png$(C)
$(CC) -c $(CPPFLAGS) $(CFLAGS) pnm2png$(C)
pnm2png$(E): pnm2png$(O)
$(LD) $(LDFLAGS) pnm2png$(O) libpng$(L) zlib$(L)
clean:
$(RM) *$(O)
$(RM) *$(E)
# End of makefile for png2pnm / pnm2png

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$!------------------------------------------------------------------------------
$! make Contrib programs of libpng under OpenVMS
$!
$!
$! Look for the compiler used
$!
$ zlibsrc = "[---.zlib]"
$ ccopt="/include=(''zlibsrc',[--])"
$ if f$getsyi("HW_MODEL").ge.1024
$ then
$ ccopt = "/prefix=all"+ccopt
$ comp = "__decc__=1"
$ if f$trnlnm("SYS").eqs."" then define sys sys$library:
$ else
$ if f$search("SYS$SYSTEM:DECC$COMPILER.EXE").eqs.""
$ then
$ if f$trnlnm("SYS").eqs."" then define sys sys$library:
$ if f$search("SYS$SYSTEM:VAXC.EXE").eqs.""
$ then
$ comp = "__gcc__=1"
$ CC :== GCC
$ else
$ comp = "__vaxc__=1"
$ endif
$ else
$ if f$trnlnm("SYS").eqs."" then define sys decc$library_include:
$ ccopt = "/decc/prefix=all"+ccopt
$ comp = "__decc__=1"
$ endif
$ endif
$ open/write lopt lib.opt
$ write lopt "[--]libpng.olb/lib"
$ write lopt "''zlibsrc'libz.olb/lib"
$ close lopt
$ open/write xopt x11.opt
$ write xopt "sys$library:decw$xlibshr.exe/share"
$ close xopt
$ write sys$output "Compiling PNG contrib programs ..."
$ write sys$output "Building pnm2png..."
$ CALL MAKE pnm2png.OBJ "cc ''CCOPT' pnm2png" -
pnm2png.c
$ call make pnm2png.exe -
"LINK pnm2png,lib.opt/opt" -
pnm2png.obj
$ write sys$output "Building png2pnm..."
$ CALL MAKE png2pnm.OBJ "cc ''CCOPT' png2pnm" -
png2pnm.c
$ call make png2pnm.exe -
"LINK png2pnm,lib.opt/opt" -
png2pnm.obj
$ exit
$!
$!
$MAKE: SUBROUTINE !SUBROUTINE TO CHECK DEPENDENCIES
$ V = 'F$Verify(0)
$! P1 = What we are trying to make
$! P2 = Command to make it
$! P3 - P8 What it depends on
$
$ If F$Search(P1) .Eqs. "" Then Goto Makeit
$ Time = F$CvTime(F$File(P1,"RDT"))
$arg=3
$Loop:
$ Argument = P'arg
$ If Argument .Eqs. "" Then Goto Exit
$ El=0
$Loop2:
$ File = F$Element(El," ",Argument)
$ If File .Eqs. " " Then Goto Endl
$ AFile = ""
$Loop3:
$ OFile = AFile
$ AFile = F$Search(File)
$ If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl
$ If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit
$ Goto Loop3
$NextEL:
$ El = El + 1
$ Goto Loop2
$EndL:
$ arg=arg+1
$ If arg .Le. 8 Then Goto Loop
$ Goto Exit
$
$Makeit:
$ VV=F$VERIFY(0)
$ write sys$output P2
$ 'P2
$ VV='F$Verify(VV)
$Exit:
$ If V Then Set Verify
$ENDSUBROUTINE

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REM -- grayscale
png2pnm.exe -noraw ..\pngsuite\basn0g01.png basn0g01.pgm
png2pnm.exe -noraw ..\pngsuite\basn0g02.png basn0g02.pgm
png2pnm.exe -noraw ..\pngsuite\basn0g04.png basn0g04.pgm
png2pnm.exe -noraw ..\pngsuite\basn0g08.png basn0g08.pgm
png2pnm.exe -noraw ..\pngsuite\basn0g16.png basn0g16.pgm
REM -- full-color
png2pnm.exe -noraw ..\pngsuite\basn2c08.png basn2c08.ppm
png2pnm.exe -noraw ..\pngsuite\basn2c16.png basn2c16.ppm
REM -- palletted
png2pnm.exe -noraw ..\pngsuite\basn3p01.png basn3p01.ppm
png2pnm.exe -noraw ..\pngsuite\basn3p02.png basn3p02.ppm
png2pnm.exe -noraw ..\pngsuite\basn3p04.png basn3p04.ppm
png2pnm.exe -noraw ..\pngsuite\basn3p08.png basn3p08.ppm
REM -- gray with alpha-channel
png2pnm.exe -noraw ..\pngsuite\basn4a08.png basn4a08.pgm
png2pnm.exe -noraw ..\pngsuite\basn4a16.png basn4a16.pgm
REM -- color with alpha-channel
png2pnm.exe -noraw -alpha basn6a08.pgm ..\pngsuite\basn6a08.png basn6a08.ppm
png2pnm.exe -noraw -alpha basn6a16.pgm ..\pngsuite\basn6a16.png basn6a16.ppm
REM -- grayscale
png2pnm.exe -raw ..\pngsuite\basn0g01.png rawn0g01.pgm
png2pnm.exe -raw ..\pngsuite\basn0g02.png rawn0g02.pgm
png2pnm.exe -raw ..\pngsuite\basn0g04.png rawn0g04.pgm
png2pnm.exe -raw ..\pngsuite\basn0g08.png rawn0g08.pgm
png2pnm.exe -raw ..\pngsuite\basn0g16.png rawn0g16.pgm
REM -- full-color
png2pnm.exe -raw ..\pngsuite\basn2c08.png rawn2c08.ppm
png2pnm.exe -raw ..\pngsuite\basn2c16.png rawn2c16.ppm
REM -- palletted
png2pnm.exe -raw ..\pngsuite\basn3p01.png rawn3p01.ppm
png2pnm.exe -raw ..\pngsuite\basn3p02.png rawn3p02.ppm
png2pnm.exe -raw ..\pngsuite\basn3p04.png rawn3p04.ppm
png2pnm.exe -raw ..\pngsuite\basn3p08.png rawn3p08.ppm
REM -- gray with alpha-channel
png2pnm.exe -raw ..\pngsuite\basn4a08.png rawn4a08.pgm
png2pnm.exe -raw ..\pngsuite\basn4a16.png rawn4a16.pgm
REM -- color with alpha-channel
png2pnm.exe -noraw -alpha rawn6a08.pgm ..\pngsuite\basn6a08.png rawn6a08.ppm
png2pnm.exe -noraw -alpha rawn6a16.pgm ..\pngsuite\basn6a16.png rawn6a16.ppm

438
src/third-party/libpng/contrib/pngminus/png2pnm.c vendored Normal file
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/*
* png2pnm.c --- conversion from PNG-file to PGM/PPM-file
* copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
*
* version 1.0 - 1999.10.15 - First version.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation. This software is provided "as is" without
* express or implied warranty.
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef __TURBOC__
#include <mem.h>
#include <fcntl.h>
#endif
#include <zlib.h>
#ifndef BOOL
#define BOOL unsigned char
#endif
#ifndef TRUE
#define TRUE (BOOL) 1
#endif
#ifndef FALSE
#define FALSE (BOOL) 0
#endif
#ifdef __TURBOC__
#define STDIN 0
#define STDOUT 1
#define STDERR 2
#endif
/* to make png2pnm verbose so we can find problems (needs to be before png.h) */
#ifndef PNG_DEBUG
#define PNG_DEBUG 0
#endif
#include "png.h"
/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* function prototypes */
int main (int argc, char *argv[]);
void usage ();
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw,
BOOL alpha);
/*
* main
*/
int main(int argc, char *argv[])
{
FILE *fp_rd = stdin;
FILE *fp_wr = stdout;
FILE *fp_al = NULL;
BOOL raw = TRUE;
BOOL alpha = FALSE;
int argi;
for (argi = 1; argi < argc; argi++)
{
if (argv[argi][0] == '-')
{
switch (argv[argi][1])
{
case 'n':
raw = FALSE;
break;
case 'r':
raw = TRUE;
break;
case 'a':
alpha = TRUE;
argi++;
if ((fp_al = fopen (argv[argi], "wb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: can not create alpha-channel file %s\n",
argv[argi]);
exit (1);
}
break;
case 'h':
case '?':
usage();
exit(0);
break;
default:
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
usage();
exit(1);
break;
} /* end switch */
}
else if (fp_rd == stdin)
{
if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
exit (1);
}
}
else if (fp_wr == stdout)
{
if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: can not create file %s\n", argv[argi]);
exit (1);
}
}
else
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: too many parameters\n");
usage();
exit(1);
}
} /* end for */
#ifdef __TURBOC__
/* set stdin/stdout if required to binary */
if (fp_rd == stdin)
{
setmode (STDIN, O_BINARY);
}
if ((raw) && (fp_wr == stdout))
{
setmode (STDOUT, O_BINARY);
}
#endif
/* call the conversion program itself */
if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE)
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: unsuccessful conversion of PNG-image\n");
exit(1);
}
/* close input file */
fclose (fp_rd);
/* close output file */
fclose (fp_wr);
/* close alpha file */
if (alpha)
fclose (fp_al);
return 0;
}
/*
* usage
*/
void usage()
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, " by Willem van Schaik, 1999\n");
#ifdef __TURBOC__
fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
#else
fprintf (stderr, " for Linux (and Unix) compilers\n");
#endif
fprintf (stderr, "Usage: png2pnm [options] <file>.png [<file>.pnm]\n");
fprintf (stderr, " or: ... | png2pnm [options]\n");
fprintf (stderr, "Options:\n");
fprintf (stderr,
" -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n");
fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n");
fprintf (stderr,
" -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n");
fprintf (stderr, " -h | -? print this help-information\n");
}
/*
* png2pnm
*/
BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file,
volatile BOOL raw, BOOL alpha)
{
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_byte buf[8];
png_byte *png_pixels = NULL;
png_byte **row_pointers = NULL;
png_byte *pix_ptr = NULL;
png_uint_32 row_bytes;
png_uint_32 width;
png_uint_32 height;
int bit_depth;
int channels;
int color_type;
int alpha_present;
int row, col;
int ret;
int i;
long dep_16;
/* read and check signature in PNG file */
ret = fread (buf, 1, 8, png_file);
if (ret != 8)
return FALSE;
ret = png_sig_cmp (buf, 0, 8);
if (ret)
return FALSE;
/* create png and info structures */
png_ptr = png_create_read_struct (png_get_libpng_ver(NULL),
NULL, NULL, NULL);
if (!png_ptr)
return FALSE; /* out of memory */
info_ptr = png_create_info_struct (png_ptr);
if (!info_ptr)
{
png_destroy_read_struct (&png_ptr, NULL, NULL);
return FALSE; /* out of memory */
}
if (setjmp (png_jmpbuf(png_ptr)))
{
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return FALSE;
}
/* set up the input control for C streams */
png_init_io (png_ptr, png_file);
png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */
/* read the file information */
png_read_info (png_ptr, info_ptr);
/* get size and bit-depth of the PNG-image */
png_get_IHDR (png_ptr, info_ptr,
&width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
/* set-up the transformations */
/* transform paletted images into full-color rgb */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand (png_ptr);
/* expand images to bit-depth 8 (only applicable for grayscale images) */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand (png_ptr);
/* transform transparency maps into full alpha-channel */
if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand (png_ptr);
#ifdef NJET
/* downgrade 16-bit images to 8 bit */
if (bit_depth == 16)
png_set_strip_16 (png_ptr);
/* transform grayscale images into full-color */
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb (png_ptr);
/* only if file has a file gamma, we do a correction */
if (png_get_gAMA (png_ptr, info_ptr, &file_gamma))
png_set_gamma (png_ptr, (double) 2.2, file_gamma);
#endif
/* all transformations have been registered; now update info_ptr data,
* get rowbytes and channels, and allocate image memory */
png_read_update_info (png_ptr, info_ptr);
/* get the new color-type and bit-depth (after expansion/stripping) */
png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
NULL, NULL, NULL);
/* check for 16-bit files */
if (bit_depth == 16)
{
raw = FALSE;
#ifdef __TURBOC__
pnm_file->flags &= ~((unsigned) _F_BIN);
#endif
}
/* calculate new number of channels and store alpha-presence */
if (color_type == PNG_COLOR_TYPE_GRAY)
channels = 1;
else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
channels = 2;
else if (color_type == PNG_COLOR_TYPE_RGB)
channels = 3;
else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
channels = 4;
else
channels = 0; /* should never happen */
alpha_present = (channels - 1) % 2;
/* check if alpha is expected to be present in file */
if (alpha && !alpha_present)
{
fprintf (stderr, "PNG2PNM\n");
fprintf (stderr, "Error: PNG-file doesn't contain alpha channel\n");
exit (1);
}
/* row_bytes is the width x number of channels x (bit-depth / 8) */
row_bytes = png_get_rowbytes (png_ptr, info_ptr);
if ((png_pixels = (png_byte *)
malloc (row_bytes * height * sizeof (png_byte))) == NULL) {
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
return FALSE;
}
if ((row_pointers = (png_byte **)
malloc (height * sizeof (png_bytep))) == NULL)
{
png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
free (png_pixels);
png_pixels = NULL;
return FALSE;
}
/* set the individual row_pointers to point at the correct offsets */
for (i = 0; i < ((int) height); i++)
row_pointers[i] = png_pixels + i * row_bytes;
/* now we can go ahead and just read the whole image */
png_read_image (png_ptr, row_pointers);
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end (png_ptr, info_ptr);
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL);
/* write header of PNM file */
if ((color_type == PNG_COLOR_TYPE_GRAY) ||
(color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
{
fprintf (pnm_file, "%s\n", (raw) ? "P5" : "P2");
fprintf (pnm_file, "%d %d\n", (int) width, (int) height);
fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
}
else if ((color_type == PNG_COLOR_TYPE_RGB) ||
(color_type == PNG_COLOR_TYPE_RGB_ALPHA))
{
fprintf (pnm_file, "%s\n", (raw) ? "P6" : "P3");
fprintf (pnm_file, "%d %d\n", (int) width, (int) height);
fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
}
/* write header of PGM file with alpha channel */
if ((alpha) &&
((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
(color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
{
fprintf (alpha_file, "%s\n", (raw) ? "P5" : "P2");
fprintf (alpha_file, "%d %d\n", (int) width, (int) height);
fprintf (alpha_file, "%ld\n", ((1L << (int) bit_depth) - 1L));
}
/* write data to PNM file */
pix_ptr = png_pixels;
for (row = 0; row < (int) height; row++)
{
for (col = 0; col < (int) width; col++)
{
for (i = 0; i < (channels - alpha_present); i++)
{
if (raw)
fputc ((int) *pix_ptr++ , pnm_file);
else
if (bit_depth == 16){
dep_16 = (long) *pix_ptr++;
fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++));
}
else
fprintf (pnm_file, "%ld ", (long) *pix_ptr++);
}
if (alpha_present)
{
if (!alpha)
{
pix_ptr++; /* alpha */
if (bit_depth == 16)
pix_ptr++;
}
else /* output alpha-channel as pgm file */
{
if (raw)
fputc ((int) *pix_ptr++ , alpha_file);
else
if (bit_depth == 16){
dep_16 = (long) *pix_ptr++;
fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++);
}
else
fprintf (alpha_file, "%ld ", (long) *pix_ptr++);
}
} /* if alpha_present */
if (!raw)
if (col % 4 == 3)
fprintf (pnm_file, "\n");
} /* end for col */
if (!raw)
if (col % 4 != 0)
fprintf (pnm_file, "\n");
} /* end for row */
if (row_pointers != (unsigned char**) NULL)
free (row_pointers);
if (png_pixels != (unsigned char*) NULL)
free (png_pixels);
return TRUE;
} /* end of source */

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src/third-party/libpng/contrib/pngminus/png2pnm.sh vendored Executable file
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#!/bin/sh
# -- grayscale
./png2pnm -noraw ../pngsuite/basn0g01.png basn0g01.pgm
./png2pnm -noraw ../pngsuite/basn0g02.png basn0g02.pgm
./png2pnm -noraw ../pngsuite/basn0g04.png basn0g04.pgm
./png2pnm -noraw ../pngsuite/basn0g08.png basn0g08.pgm
./png2pnm -noraw ../pngsuite/basn0g16.png basn0g16.pgm
# -- full-color
./png2pnm -noraw ../pngsuite/basn2c08.png basn2c08.ppm
./png2pnm -noraw ../pngsuite/basn2c16.png basn2c16.ppm
# -- palletted
./png2pnm -noraw ../pngsuite/basn3p01.png basn3p01.ppm
./png2pnm -noraw ../pngsuite/basn3p02.png basn3p02.ppm
./png2pnm -noraw ../pngsuite/basn3p04.png basn3p04.ppm
./png2pnm -noraw ../pngsuite/basn3p08.png basn3p08.ppm
# -- gray with alpha-channel
./png2pnm -noraw ../pngsuite/basn4a08.png basn4a08.pgm
./png2pnm -noraw ../pngsuite/basn4a16.png basn4a16.pgm
# -- color with alpha-channel
./png2pnm -noraw -alpha basn6a08.pgm ../pngsuite/basn6a08.png basn6a08.ppm
./png2pnm -noraw -alpha basn6a16.pgm ../pngsuite/basn6a16.png basn6a16.ppm
# -- grayscale
./png2pnm -raw ../pngsuite/basn0g01.png rawn0g01.pgm
./png2pnm -raw ../pngsuite/basn0g02.png rawn0g02.pgm
./png2pnm -raw ../pngsuite/basn0g04.png rawn0g04.pgm
./png2pnm -raw ../pngsuite/basn0g08.png rawn0g08.pgm
./png2pnm -raw ../pngsuite/basn0g16.png rawn0g16.pgm
# -- full-color
./png2pnm -raw ../pngsuite/basn2c08.png rawn2c08.ppm
./png2pnm -raw ../pngsuite/basn2c16.png rawn2c16.ppm
# -- palletted
./png2pnm -raw ../pngsuite/basn3p01.png rawn3p01.ppm
./png2pnm -raw ../pngsuite/basn3p02.png rawn3p02.ppm
./png2pnm -raw ../pngsuite/basn3p04.png rawn3p04.ppm
./png2pnm -raw ../pngsuite/basn3p08.png rawn3p08.ppm
# -- gray with alpha-channel
./png2pnm -raw ../pngsuite/basn4a08.png rawn4a08.pgm
./png2pnm -raw ../pngsuite/basn4a16.png rawn4a16.pgm
# -- color with alpha-channel
./png2pnm -noraw -alpha rawn6a08.pgm ../pngsuite/basn6a08.png rawn6a08.ppm
./png2pnm -noraw -alpha rawn6a16.pgm ../pngsuite/basn6a16.png rawn6a16.ppm

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src/third-party/libpng/contrib/pngminus/pngminus.bat vendored Executable file
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make -f makefile.tc3
call png2pnm.bat
call pnm2png.bat

5
src/third-party/libpng/contrib/pngminus/pngminus.sh vendored Executable file
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#!/bin/sh
make -f makefile.std
sh png2pnm.sh
sh pnm2png.sh

41
src/third-party/libpng/contrib/pngminus/pnm2png.bat vendored Executable file
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REM -- grayscale
pnm2png.exe basn0g01.pgm basn0g01.png
pnm2png.exe basn0g02.pgm basn0g02.png
pnm2png.exe basn0g04.pgm basn0g04.png
pnm2png.exe basn0g08.pgm basn0g08.png
pnm2png.exe basn0g16.pgm basn0g16.png
REM -- full-color
pnm2png.exe basn2c08.ppm basn2c08.png
pnm2png.exe basn2c16.ppm basn2c16.png
REM -- palletted
pnm2png.exe basn3p01.ppm basn3p01.png
pnm2png.exe basn3p02.ppm basn3p02.png
pnm2png.exe basn3p04.ppm basn3p04.png
pnm2png.exe basn3p08.ppm basn3p08.png
REM -- gray with alpha-channel
pnm2png.exe -alpha basn6a08.pgm basn4a08.pgm basn4a08.png
pnm2png.exe -alpha basn6a16.pgm basn4a16.pgm basn4a16.png
REM -- color with alpha-channel
pnm2png.exe -alpha basn6a08.pgm basn6a08.ppm basn6a08.png
pnm2png.exe -alpha basn6a16.pgm basn6a16.ppm basn6a16.png
REM -- grayscale
pnm2png.exe rawn0g01.pgm rawn0g01.png
pnm2png.exe rawn0g02.pgm rawn0g02.png
pnm2png.exe rawn0g04.pgm rawn0g04.png
pnm2png.exe rawn0g08.pgm rawn0g08.png
pnm2png.exe rawn0g16.pgm rawn0g16.png
REM -- full-color
pnm2png.exe rawn2c08.ppm rawn2c08.png
pnm2png.exe rawn2c16.ppm rawn2c16.png
REM -- palletted
pnm2png.exe rawn3p01.ppm rawn3p01.png
pnm2png.exe rawn3p02.ppm rawn3p02.png
pnm2png.exe rawn3p04.ppm rawn3p04.png
pnm2png.exe rawn3p08.ppm rawn3p08.png
REM -- gray with alpha-channel
pnm2png.exe -alpha rawn6a08.pgm rawn4a08.pgm rawn4a08.png
pnm2png.exe -alpha rawn6a16.pgm rawn4a16.pgm rawn4a16.png
REM -- color with alpha-channel
pnm2png.exe -alpha rawn6a08.pgm rawn6a08.ppm rawn6a08.png
pnm2png.exe -alpha rawn6a16.pgm rawn6a16.ppm rawn6a16.png

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src/third-party/libpng/contrib/pngminus/pnm2png.c vendored Normal file
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/*
* pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
* copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
*
* version 1.0 - 1999.10.15 - First version.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation. This software is provided "as is" without
* express or implied warranty.
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef __TURBOC__
#include <mem.h>
#include <fcntl.h>
#endif
#include <zlib.h>
#ifndef BOOL
#define BOOL unsigned char
#endif
#ifndef TRUE
#define TRUE (BOOL) 1
#endif
#ifndef FALSE
#define FALSE (BOOL) 0
#endif
#define STDIN 0
#define STDOUT 1
#define STDERR 2
/* to make pnm2png verbose so we can find problems (needs to be before png.h) */
#ifndef PNG_DEBUG
#define PNG_DEBUG 0
#endif
#include "png.h"
/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#endif
/* function prototypes */
int main (int argc, char *argv[]);
void usage ();
BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
BOOL alpha);
void get_token(FILE *pnm_file, char *token);
png_uint_32 get_data (FILE *pnm_file, int depth);
png_uint_32 get_value (FILE *pnm_file, int depth);
/*
* main
*/
int main(int argc, char *argv[])
{
FILE *fp_rd = stdin;
FILE *fp_al = NULL;
FILE *fp_wr = stdout;
BOOL interlace = FALSE;
BOOL alpha = FALSE;
int argi;
for (argi = 1; argi < argc; argi++)
{
if (argv[argi][0] == '-')
{
switch (argv[argi][1])
{
case 'i':
interlace = TRUE;
break;
case 'a':
alpha = TRUE;
argi++;
if ((fp_al = fopen (argv[argi], "rb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
argv[argi]);
exit (1);
}
break;
case 'h':
case '?':
usage();
exit(0);
break;
default:
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
usage();
exit(1);
break;
} /* end switch */
}
else if (fp_rd == stdin)
{
if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
exit (1);
}
}
else if (fp_wr == stdout)
{
if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
exit (1);
}
}
else
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: too many parameters\n");
usage();
exit (1);
}
} /* end for */
#ifdef __TURBOC__
/* set stdin/stdout to binary, we're reading the PNM always! in binary format */
if (fp_rd == stdin)
{
setmode (STDIN, O_BINARY);
}
if (fp_wr == stdout)
{
setmode (STDOUT, O_BINARY);
}
#endif
/* call the conversion program itself */
if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
exit (1);
}
/* close input file */
fclose (fp_rd);
/* close output file */
fclose (fp_wr);
/* close alpha file */
if (alpha)
fclose (fp_al);
return 0;
}
/*
* usage
*/
void usage()
{
fprintf (stderr, "PNM2PNG\n");
fprintf (stderr, " by Willem van Schaik, 1999\n");
#ifdef __TURBOC__
fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
#else
fprintf (stderr, " for Linux (and Unix) compilers\n");
#endif
fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
fprintf (stderr, " or: ... | pnm2png [options]\n");
fprintf (stderr, "Options:\n");
fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
fprintf (stderr,
" -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
fprintf (stderr, " -h | -? print this help-information\n");
}
/*
* pnm2png
*/
BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
BOOL alpha)
{
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_byte *png_pixels = NULL;
png_byte **row_pointers = NULL;
png_byte *pix_ptr = NULL;
volatile png_uint_32 row_bytes;
char type_token[16];
char width_token[16];
char height_token[16];
char maxval_token[16];
volatile int color_type;
unsigned long ul_width=0, ul_alpha_width=0;
unsigned long ul_height=0, ul_alpha_height=0;
unsigned long ul_maxval=0;
volatile png_uint_32 width, height;
volatile png_uint_32 alpha_width, alpha_height;
png_uint_32 maxval;
volatile int bit_depth = 0;
int channels;
int alpha_depth = 0;
int alpha_present;
int row, col;
BOOL raw, alpha_raw = FALSE;
#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
BOOL packed_bitmap = FALSE;
#endif
png_uint_32 tmp16;
int i;
/* read header of PNM file */
get_token(pnm_file, type_token);
if (type_token[0] != 'P')
{
return FALSE;
}
else if ((type_token[1] == '1') || (type_token[1] == '4'))
{
#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
raw = (type_token[1] == '4');
color_type = PNG_COLOR_TYPE_GRAY;
get_token(pnm_file, width_token);
sscanf (width_token, "%lu", &ul_width);
width = (png_uint_32) ul_width;
get_token(pnm_file, height_token);
sscanf (height_token, "%lu", &ul_height);
height = (png_uint_32) ul_height;
bit_depth = 1;
packed_bitmap = TRUE;
#else
fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
#endif
}
else if ((type_token[1] == '2') || (type_token[1] == '5'))
{
raw = (type_token[1] == '5');
color_type = PNG_COLOR_TYPE_GRAY;
get_token(pnm_file, width_token);
sscanf (width_token, "%lu", &ul_width);
width = (png_uint_32) ul_width;
get_token(pnm_file, height_token);
sscanf (height_token, "%lu", &ul_height);
height = (png_uint_32) ul_height;
get_token(pnm_file, maxval_token);
sscanf (maxval_token, "%lu", &ul_maxval);
maxval = (png_uint_32) ul_maxval;
if (maxval <= 1)
bit_depth = 1;
else if (maxval <= 3)
bit_depth = 2;
else if (maxval <= 15)
bit_depth = 4;
else if (maxval <= 255)
bit_depth = 8;
else /* if (maxval <= 65535) */
bit_depth = 16;
}
else if ((type_token[1] == '3') || (type_token[1] == '6'))
{
raw = (type_token[1] == '6');
color_type = PNG_COLOR_TYPE_RGB;
get_token(pnm_file, width_token);
sscanf (width_token, "%lu", &ul_width);
width = (png_uint_32) ul_width;
get_token(pnm_file, height_token);
sscanf (height_token, "%lu", &ul_height);
height = (png_uint_32) ul_height;
get_token(pnm_file, maxval_token);
sscanf (maxval_token, "%lu", &ul_maxval);
maxval = (png_uint_32) ul_maxval;
if (maxval <= 1)
bit_depth = 1;
else if (maxval <= 3)
bit_depth = 2;
else if (maxval <= 15)
bit_depth = 4;
else if (maxval <= 255)
bit_depth = 8;
else /* if (maxval <= 65535) */
bit_depth = 16;
}
else
{
return FALSE;
}
/* read header of PGM file with alpha channel */
if (alpha)
{
if (color_type == PNG_COLOR_TYPE_GRAY)
color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
if (color_type == PNG_COLOR_TYPE_RGB)
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
get_token(alpha_file, type_token);
if (type_token[0] != 'P')
{
return FALSE;
}
else if ((type_token[1] == '2') || (type_token[1] == '5'))
{
alpha_raw = (type_token[1] == '5');
get_token(alpha_file, width_token);
sscanf (width_token, "%lu", &ul_alpha_width);
alpha_width=(png_uint_32) ul_alpha_width;
if (alpha_width != width)
return FALSE;
get_token(alpha_file, height_token);
sscanf (height_token, "%lu", &ul_alpha_height);
alpha_height = (png_uint_32) ul_alpha_height;
if (alpha_height != height)
return FALSE;
get_token(alpha_file, maxval_token);
sscanf (maxval_token, "%lu", &ul_maxval);
maxval = (png_uint_32) ul_maxval;
if (maxval <= 1)
alpha_depth = 1;
else if (maxval <= 3)
alpha_depth = 2;
else if (maxval <= 15)
alpha_depth = 4;
else if (maxval <= 255)
alpha_depth = 8;
else /* if (maxval <= 65535) */
alpha_depth = 16;
if (alpha_depth != bit_depth)
return FALSE;
}
else
{
return FALSE;
}
} /* end if alpha */
/* calculate the number of channels and store alpha-presence */
if (color_type == PNG_COLOR_TYPE_GRAY)
channels = 1;
else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
channels = 2;
else if (color_type == PNG_COLOR_TYPE_RGB)
channels = 3;
else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
channels = 4;
else
channels = 0; /* should not happen */
alpha_present = (channels - 1) % 2;
#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
if (packed_bitmap)
/* row data is as many bytes as can fit width x channels x bit_depth */
row_bytes = (width * channels * bit_depth + 7) / 8;
else
#endif
/* row_bytes is the width x number of channels x (bit-depth / 8) */
row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
if ((png_pixels = (png_byte *)
malloc (row_bytes * height * sizeof (png_byte))) == NULL)
return FALSE;
/* read data from PNM file */
pix_ptr = png_pixels;
for (row = 0; row < (int) height; row++)
{
#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
if (packed_bitmap) {
for (i = 0; i < (int) row_bytes; i++)
/* png supports this format natively so no conversion is needed */
*pix_ptr++ = get_data (pnm_file, 8);
} else
#endif
{
for (col = 0; col < (int) width; col++)
{
for (i = 0; i < (channels - alpha_present); i++)
{
if (raw)
*pix_ptr++ = get_data (pnm_file, bit_depth);
else
if (bit_depth <= 8)
*pix_ptr++ = get_value (pnm_file, bit_depth);
else
{
tmp16 = get_value (pnm_file, bit_depth);
*pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
pix_ptr++;
*pix_ptr = (png_byte) (tmp16 & 0xFF);
pix_ptr++;
}
}
if (alpha) /* read alpha-channel from pgm file */
{
if (alpha_raw)
*pix_ptr++ = get_data (alpha_file, alpha_depth);
else
if (alpha_depth <= 8)
*pix_ptr++ = get_value (alpha_file, bit_depth);
else
{
tmp16 = get_value (alpha_file, bit_depth);
*pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
*pix_ptr++ = (png_byte) (tmp16 & 0xFF);
}
} /* if alpha */
} /* if packed_bitmap */
} /* end for col */
} /* end for row */
/* prepare the standard PNG structures */
png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
NULL);
if (!png_ptr)
{
return FALSE;
}
info_ptr = png_create_info_struct (png_ptr);
if (!info_ptr)
{
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
return FALSE;
}
#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
if (packed_bitmap == TRUE)
{
png_set_packing (png_ptr);
png_set_invert_mono (png_ptr);
}
#endif
/* setjmp() must be called in every function that calls a PNG-reading libpng function */
if (setjmp (png_jmpbuf(png_ptr)))
{
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
return FALSE;
}
/* initialize the png structure */
png_init_io (png_ptr, png_file);
/* we're going to write more or less the same PNG as the input file */
png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
(!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
/* write the file header information */
png_write_info (png_ptr, info_ptr);
/* if needed we will allocate memory for an new array of row-pointers */
if (row_pointers == (unsigned char**) NULL)
{
if ((row_pointers = (png_byte **)
malloc (height * sizeof (png_bytep))) == NULL)
{
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
return FALSE;
}
}
/* set the individual row_pointers to point at the correct offsets */
for (i = 0; i < (int) height; i++)
row_pointers[i] = png_pixels + i * row_bytes;
/* write out the entire image data in one call */
png_write_image (png_ptr, row_pointers);
/* write the additional chunks to the PNG file (not really needed) */
png_write_end (png_ptr, info_ptr);
/* clean up after the write, and free any memory allocated */
png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
if (row_pointers != (unsigned char**) NULL)
free (row_pointers);
if (png_pixels != (unsigned char*) NULL)
free (png_pixels);
return TRUE;
} /* end of pnm2png */
/*
* get_token() - gets the first string after whitespace
*/
void get_token(FILE *pnm_file, char *token)
{
int i = 0;
int ret;
/* remove white-space and comment lines */
do
{
ret = fgetc(pnm_file);
if (ret == '#') {
/* the rest of this line is a comment */
do
{
ret = fgetc(pnm_file);
}
while ((ret != '\n') && (ret != '\r') && (ret != EOF));
}
if (ret == EOF) break;
token[i] = (unsigned char) ret;
}
while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
/* read string */
do
{
ret = fgetc(pnm_file);
if (ret == EOF) break;
i++;
token[i] = (unsigned char) ret;
}
while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
token[i] = '\0';
return;
}
/*
* get_data() - takes first byte and converts into next pixel value,
* taking as much bits as defined by bit-depth and
* using the bit-depth to fill up a byte (0Ah -> AAh)
*/
png_uint_32 get_data (FILE *pnm_file, int depth)
{
static int bits_left = 0;
static int old_value = 0;
static int mask = 0;
int i;
png_uint_32 ret_value;
if (mask == 0)
for (i = 0; i < depth; i++)
mask = (mask >> 1) | 0x80;
if (bits_left <= 0)
{
old_value = fgetc (pnm_file);
bits_left = 8;
}
ret_value = old_value & mask;
for (i = 1; i < (8 / depth); i++)
ret_value = ret_value || (ret_value >> depth);
old_value = (old_value << depth) & 0xFF;
bits_left -= depth;
return ret_value;
}
/*
* get_value() - takes first (numeric) string and converts into number,
* using the bit-depth to fill up a byte (0Ah -> AAh)
*/
png_uint_32 get_value (FILE *pnm_file, int depth)
{
static png_uint_32 mask = 0;
png_byte token[16];
unsigned long ul_ret_value;
png_uint_32 ret_value;
int i = 0;
if (mask == 0)
for (i = 0; i < depth; i++)
mask = (mask << 1) | 0x01;
get_token (pnm_file, (char *) token);
sscanf ((const char *) token, "%lu", &ul_ret_value);
ret_value = (png_uint_32) ul_ret_value;
ret_value &= mask;
if (depth < 8)
for (i = 0; i < (8 / depth); i++)
ret_value = (ret_value << depth) || ret_value;
return ret_value;
}
/* end of source */

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src/third-party/libpng/contrib/pngminus/pnm2png.sh vendored Executable file
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#!/bin/sh
# -- grayscale
./pnm2png basn0g01.pgm basn0g01.png
./pnm2png basn0g02.pgm basn0g02.png
./pnm2png basn0g04.pgm basn0g04.png
./pnm2png basn0g08.pgm basn0g08.png
./pnm2png basn0g16.pgm basn0g16.png
# -- full-color
./pnm2png basn2c08.ppm basn2c08.png
./pnm2png basn2c16.ppm basn2c16.png
# -- palletted
./pnm2png basn3p01.ppm basn3p01.png
./pnm2png basn3p02.ppm basn3p02.png
./pnm2png basn3p04.ppm basn3p04.png
./pnm2png basn3p08.ppm basn3p08.png
# -- gray with alpha-channel
./pnm2png -alpha basn6a08.pgm basn4a08.pgm basn4a08.png
./pnm2png -alpha basn6a16.pgm basn4a16.pgm basn4a16.png
# -- color with alpha-channel
./pnm2png -alpha basn6a08.pgm basn6a08.ppm basn6a08.png
./pnm2png -alpha basn6a16.pgm basn6a16.ppm basn6a16.png
# -- grayscale
./pnm2png rawn0g01.pgm rawn0g01.png
./pnm2png rawn0g02.pgm rawn0g02.png
./pnm2png rawn0g04.pgm rawn0g04.png
./pnm2png rawn0g08.pgm rawn0g08.png
./pnm2png rawn0g16.pgm rawn0g16.png
# -- full-color
./pnm2png rawn2c08.ppm rawn2c08.png
./pnm2png rawn2c16.ppm rawn2c16.png
# -- palletted
./pnm2png rawn3p01.ppm rawn3p01.png
./pnm2png rawn3p02.ppm rawn3p02.png
./pnm2png rawn3p04.ppm rawn3p04.png
./pnm2png rawn3p08.ppm rawn3p08.png
# -- gray with alpha-channel
./pnm2png -alpha rawn6a08.pgm rawn4a08.pgm rawn4a08.png
./pnm2png -alpha rawn6a16.pgm rawn4a16.pgm rawn4a16.png
# -- color with alpha-channel
./pnm2png -alpha rawn6a08.pgm rawn6a08.ppm rawn6a08.png
./pnm2png -alpha rawn6a16.pgm rawn6a16.ppm rawn6a16.png

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pngsuite
--------
(c) Willem van Schaik, 1999, 2011, 2012
Two images are by Glenn Randers-Pehrson, 2012
Permission to use, copy, modify, and distribute these images for any
purpose and without fee is hereby granted.
The 15 "bas*.png" images are part of the much larger PngSuite test-set of
images, available for developers of PNG supporting software. The
complete set, available at http:/www.schaik.com/pngsuite/, contains
a variety of images to test interlacing, gamma settings, ancillary
chunks, etc.
The "ft*.png" images are "free/libre" replacements for the transparent
corresponding t*.png images in the PngSuite.
The images in this directory represent the basic PNG color-types:
grayscale (1-16 bit deep), full color (8 or 16 bit), paletted
(1-8 bit) and grayscale or color images with alpha channel. You
can use them to test the proper functioning of PNG software.
filename depth type
------------ ------ --------------
basn0g01.png 1-bit grayscale
basn0g02.png 2-bit grayscale
basn0g04.png 4-bit grayscale
basn0g08.png 8-bit grayscale
basn0g16.png 16-bit grayscale
basn2c08.png 8-bit truecolor
basn2c16.png 16-bit truecolor
basn3p01.png 1-bit paletted
basn3p02.png 2-bit paletted
basn3p04.png 4-bit paletted
basn3p08.png 8-bit paletted
basn4a08.png 8-bit gray with alpha
basn4a16.png 16-bit gray with alpha
basn6a08.png 8-bit RGBA
basn6a16.png 16-bit RGBA
ftbbn0g01.png 1-bit grayscale, black bKGD
ftbbn0g02.png 2-bit grayscale, black bKGD
ftbbn0g04.png 4-bit grayscale, black bKGD
ftbbn2c16.png 16-bit truecolor, black bKGD
ftbbn3p08.png 8-bit paletted, black bKGD
ftbgn2c16.png 16-bit truecolor, gray bKGD
ftbgn3p08.png 8-bit paletted, gray bKGD
ftbrn2c08.png 8-bit truecolor, red bKGD
ftbwn0g16.png 16-bit gray, white bKGD
ftbwn3p08.png 8-bit paletted, white bKGD
ftbyn3p08.png 8-bit paletted, yellow bKGD
ftp0n0g08.png 8-bit grayscale, opaque
ftp0n2c08.png 8-bit truecolor, opaque
ftp0n3p08.png 8-bit paletted, opaque
ftp1n3p08.png 8-bit paletted, no bKGD
Here is the correct result of typing "pngtest -m bas*.png" in
this directory:
Testing basn0g01.png: PASS (524 zero samples)
Filter 0 was used 32 times
Testing basn0g02.png: PASS (448 zero samples)
Filter 0 was used 32 times
Testing basn0g04.png: PASS (520 zero samples)
Filter 0 was used 32 times
Testing basn0g08.png: PASS (3 zero samples)
Filter 1 was used 9 times
Filter 4 was used 23 times
Testing basn0g16.png: PASS (1 zero samples)
Filter 1 was used 1 times
Filter 2 was used 31 times
Testing basn2c08.png: PASS (6 zero samples)
Filter 1 was used 5 times
Filter 4 was used 27 times
Testing basn2c16.png: PASS (592 zero samples)
Filter 1 was used 1 times
Filter 4 was used 31 times
Testing basn3p01.png: PASS (512 zero samples)
Filter 0 was used 32 times
Testing basn3p02.png: PASS (448 zero samples)
Filter 0 was used 32 times
Testing basn3p04.png: PASS (544 zero samples)
Filter 0 was used 32 times
Testing basn3p08.png: PASS (4 zero samples)
Filter 0 was used 32 times
Testing basn4a08.png: PASS (32 zero samples)
Filter 1 was used 1 times
Filter 4 was used 31 times
Testing basn4a16.png: PASS (64 zero samples)
Filter 0 was used 1 times
Filter 1 was used 2 times
Filter 2 was used 1 times
Filter 4 was used 28 times
Testing basn6a08.png: PASS (160 zero samples)
Filter 1 was used 1 times
Filter 4 was used 31 times
Testing basn6a16.png: PASS (1072 zero samples)
Filter 1 was used 4 times
Filter 4 was used 28 times
libpng passes test
Willem van Schaik
<willem@schaik.com>
October 1999

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