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project64/Source/GlideHQ/TxImage.cpp

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/*
* Texture Filtering
* Version: 1.0
*
* Copyright (C) 2007 Hiroshi Morii All Rights Reserved.
* Email koolsmoky(at)users.sourceforge.net
* Web http://www.3dfxzone.it/koolsmoky
*
* this 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 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* use power of 2 texture size
* (0:disable, 1:enable, 2:3dfx) */
#define POW2_TEXTURES 0
/* check 8 bytes. use a larger value if needed. */
#define PNG_CHK_BYTES 8
#include "TxImage.h"
#include "TxReSample.h"
#include "TxDbg.h"
#include <stdlib.h>
boolean
TxImage::getPNGInfo(FILE *fp, png_structp *png_ptr, png_infop *info_ptr)
{
unsigned char sig[PNG_CHK_BYTES];
/* check for valid file pointer */
if (!fp)
return 0;
/* check if file is PNG */
if (fread(sig, 1, PNG_CHK_BYTES, fp) != PNG_CHK_BYTES)
return 0;
if (png_sig_cmp(sig, 0, PNG_CHK_BYTES) != 0)
return 0;
/* get PNG file info */
*png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!*png_ptr)
return 0;
*info_ptr = png_create_info_struct(*png_ptr);
if (!*info_ptr) {
png_destroy_read_struct(png_ptr, NULL, NULL);
return 0;
}
if (setjmp(png_jmpbuf(*png_ptr))) {
DBG_INFO(80, L"error reading png!\n");
png_destroy_read_struct(png_ptr, info_ptr, NULL);
return 0;
}
png_init_io(*png_ptr, fp);
png_set_sig_bytes(*png_ptr, PNG_CHK_BYTES);
png_read_info(*png_ptr, *info_ptr);
return 1;
}
uint8*
TxImage::readPNG(FILE* fp, int* width, int* height, uint16* format)
{
/* NOTE: returned image format is GR_TEXFMT_ARGB_8888 */
png_structp png_ptr;
png_infop info_ptr;
uint8 *image = NULL;
int bit_depth, color_type, interlace_type, compression_type, filter_type,
row_bytes, o_width, o_height, num_pas;
/* initialize */
*width = 0;
*height = 0;
*format = 0;
/* check if we have a valid png file */
if (!fp)
return NULL;
if (!getPNGInfo(fp, &png_ptr, &info_ptr)) {
INFO(80, L"error reading png file! png image is corrupt.\n");
return NULL;
}
png_get_IHDR(png_ptr, info_ptr,
(png_uint_32*)&o_width, (png_uint_32*)&o_height, &bit_depth, &color_type,
&interlace_type, &compression_type, &filter_type);
DBG_INFO(80, L"png format %d x %d bitdepth:%d color:%x interlace:%x compression:%x filter:%x\n",
o_width, o_height, bit_depth, color_type,
interlace_type, compression_type, filter_type);
/* transformations */
/* Rice hi-res textures
* _all.png
* _rgb.png, _a.png
* _ciByRGBA.png
* _allciByRGBA.png
*/
/* strip if color channel is larger than 8 bits */
if (bit_depth > 8) {
png_set_strip_16(png_ptr);
bit_depth = 8;
}
#if 1
/* These are not really required per Rice format spec,
* but is done just in case someone uses them.
*/
/* convert palette color to rgb color */
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
color_type = PNG_COLOR_TYPE_RGB;
}
/* expand 1,2,4 bit gray scale to 8 bit gray scale */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand_gray_1_2_4_to_8(png_ptr);
/* convert gray scale or gray scale + alpha to rgb color */
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
color_type = PNG_COLOR_TYPE_RGB;
}
#endif
/* add alpha channel if any */
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_set_tRNS_to_alpha(png_ptr);
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
/* convert rgb to rgba */
if (color_type == PNG_COLOR_TYPE_RGB) {
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
/* punt invalid formats */
if (color_type != PNG_COLOR_TYPE_RGB_ALPHA) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
DBG_INFO(80, L"Error: not PNG_COLOR_TYPE_RGB_ALPHA format!\n");
return NULL;
}
/*png_color_8p sig_bit;
if (png_get_sBIT(png_ptr, info_ptr, &sig_bit))
png_set_shift(png_ptr, sig_bit);*/
/* convert rgba to bgra */
png_set_bgr(png_ptr);
/* turn on interlace handling to cope with the weirdness
* of texture authors using interlaced format */
num_pas = png_set_interlace_handling(png_ptr);
/* update info structure */
png_read_update_info(png_ptr, info_ptr);
/* we only get here if ARGB8888 */
row_bytes = png_get_rowbytes(png_ptr, info_ptr);
/* allocate memory to read in image */
image = (uint8*)malloc(row_bytes * o_height);
/* read in image */
if (image) {
int pas, i;
uint8* tmpimage;
for (pas = 0; pas < num_pas; pas++) { /* deal with interlacing */
tmpimage = image;
for (i = 0; i < o_height; i++) {
/* copy row */
png_read_rows(png_ptr, &tmpimage, NULL, 1);
tmpimage += row_bytes;
}
}
/* read rest of the info structure */
png_read_end(png_ptr, info_ptr);
*width = (row_bytes >> 2);
*height = o_height;
*format = GR_TEXFMT_ARGB_8888;
#if POW2_TEXTURES
/* next power of 2 size conversions */
/* NOTE: I can do this in the above loop for faster operations, but some
* texture packs require a workaround. see HACKALERT in nextPow2().
*/
TxReSample txReSample = new TxReSample; // XXX: temporary. move to a better place.
#if (POW2_TEXTURES == 2)
if (!txReSample->nextPow2(&image, width, height, 32, 1)) {
#else
if (!txReSample->nextPow2(&image, width, height, 32, 0)) {
#endif
if (image) {
free(image);
image = NULL;
}
*width = 0;
*height = 0;
*format = 0;
}
delete txReSample;
#endif /* POW2_TEXTURES */
}
/* clean up */
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
#ifdef DEBUG
if (!image) {
DBG_INFO(80, L"Error: failed to load png image!\n");
}
#endif
return image;
}
boolean
TxImage::writePNG(uint8* src, FILE* fp, int width, int height, int rowStride, uint16 format, uint8 *palette)
{
png_structp png_ptr;
png_infop info_ptr;
png_color_8 sig_bit;
png_colorp palette_ptr;
png_bytep trans_ptr;//, tex_ptr;
int bit_depth, color_type, row_bytes, num_palette;
int i;
//uint16 srcfmt, destfmt;
if (!src || !fp)
return 0;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL)
return 0;
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_write_struct(&png_ptr, NULL);
return 0;
}
/*if (setjmp(png_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return 0;
}*/
png_init_io(png_ptr, fp);
/* TODO: images must be converted to RGBA8888 or CI8,
* palettes need to be separated to A and RGB. */
/* N64 formats
* Format: 0 - RGBA, 1 - YUV, 2 - CI, 3 - IA, 4 - I
* Size: 0 - 4bit, 1 - 8bit, 2 - 16bit, 3 - 32 bit
* format = (Format << 8 | Size);
*/
/* each channel is saved in 8bits for consistency */
switch (format) {
case 0x0002:/* RGBA5551 */
bit_depth = 8;
sig_bit.red = 5;
sig_bit.green = 5;
sig_bit.blue = 5;
sig_bit.alpha = 1;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case 0x0003:/* RGBA8888 */
case 0x0302:/* IA88 */
bit_depth = 8;
sig_bit.red = 8;
sig_bit.green = 8;
sig_bit.blue = 8;
sig_bit.alpha = 8;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case 0x0300:/* IA31 */
bit_depth = 8;
sig_bit.red = 3;
sig_bit.green = 3;
sig_bit.blue = 3;
sig_bit.alpha = 1;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case 0x0301:/* IA44 */
bit_depth = 8;
sig_bit.red = 4;
sig_bit.green = 4;
sig_bit.blue = 4;
sig_bit.alpha = 4;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case 0x0400:/* I4 */
bit_depth = 8;
sig_bit.red = 4;
sig_bit.green = 4;
sig_bit.blue = 4;
color_type = PNG_COLOR_TYPE_RGB;
break;
case 0x0401:/* I8 */
case 0x0402:/* I16 */
bit_depth = 8;
sig_bit.red = 8;
sig_bit.green = 8;
sig_bit.blue = 8;
color_type = PNG_COLOR_TYPE_RGB;
break;
case 0x0200:/* CI4 */
bit_depth = 8;
num_palette = 16;
color_type = PNG_COLOR_TYPE_PALETTE;
break;
case 0x0201:/* CI8 */
bit_depth = 8;
num_palette = 256;
color_type = PNG_COLOR_TYPE_PALETTE;
break;
case 0x0102:/* YUV ? */
case 0x0103:
default:
/* unsupported format */
png_destroy_write_struct(&png_ptr, &info_ptr);
return 0;
}
switch (color_type) {
case PNG_COLOR_TYPE_RGB_ALPHA:
case PNG_COLOR_TYPE_RGB:
//row_bytes = (bit_depth * width) >> 1;
row_bytes = rowStride;
png_set_bgr(png_ptr);
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
break;
case PNG_COLOR_TYPE_PALETTE:
//row_bytes = (bit_depth * width) >> 3;
row_bytes = rowStride;
png_set_PLTE(png_ptr, info_ptr, palette_ptr, num_palette);
png_set_tRNS(png_ptr, info_ptr, trans_ptr, num_palette, 0);
}
//png_set_filter(png_ptr, 0, PNG_ALL_FILTERS);
//if (bit_depth == 16)
// png_set_swap(png_ptr);
//if (bit_depth < 8)
// png_set_packswap(png_ptr);
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, color_type, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
//png_set_gAMA(png_ptr, info_ptr, 1.0);
png_write_info(png_ptr, info_ptr);
for (i = 0; i < height; i++) {
png_write_row(png_ptr, (png_bytep)src);
src += row_bytes;
}
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
//if (tex_ptr) delete [] tex_ptr;
return 1;
}
boolean
TxImage::getBMPInfo(FILE* fp, BITMAPFILEHEADER* bmp_fhdr, BITMAPINFOHEADER* bmp_ihdr)
{
/*
* read in BITMAPFILEHEADER
*/
/* is this a BMP file? */
if (fread(&bmp_fhdr->bfType, 2, 1, fp) != 1)
return 0;
if (memcmp(&bmp_fhdr->bfType, "BM", 2) != 0)
return 0;
/* get file size */
if (fread(&bmp_fhdr->bfSize, 4, 1, fp) != 1)
return 0;
/* reserved 1 */
if (fread(&bmp_fhdr->bfReserved1, 2, 1, fp) != 1)
return 0;
/* reserved 2 */
if (fread(&bmp_fhdr->bfReserved2, 2, 1, fp) != 1)
return 0;
/* offset to the image data */
if (fread(&bmp_fhdr->bfOffBits, 4, 1, fp) != 1)
return 0;
/*
* read in BITMAPINFOHEADER
*/
/* size of BITMAPINFOHEADER */
if (fread(&bmp_ihdr->biSize, 4, 1, fp) != 1)
return 0;
/* is this a Windows BMP? */
if (bmp_ihdr->biSize != 40)
return 0;
/* width of the bitmap in pixels */
if (fread(&bmp_ihdr->biWidth, 4, 1, fp) != 1)
return 0;
/* height of the bitmap in pixels */
if (fread(&bmp_ihdr->biHeight, 4, 1, fp) != 1)
return 0;
/* number of planes (always 1) */
if (fread(&bmp_ihdr->biPlanes, 2, 1, fp) != 1)
return 0;
/* number of bits-per-pixel. (1, 4, 8, 16, 24, 32) */
if (fread(&bmp_ihdr->biBitCount, 2, 1, fp) != 1)
return 0;
/* compression for a compressed bottom-up bitmap
* 0 : uncompressed format
* 1 : run-length encoded 4 bpp format
* 2 : run-length encoded 8 bpp format
* 3 : bitfield
*/
if (fread(&bmp_ihdr->biCompression, 4, 1, fp) != 1)
return 0;
/* size of the image in bytes */
if (fread(&bmp_ihdr->biSizeImage, 4, 1, fp) != 1)
return 0;
/* horizontal resolution in pixels-per-meter */
if (fread(&bmp_ihdr->biXPelsPerMeter, 4, 1, fp) != 1)
return 0;
/* vertical resolution in pixels-per-meter */
if (fread(&bmp_ihdr->biYPelsPerMeter, 4, 1, fp) != 1)
return 0;
/* number of color indexes in the color table that are actually used */
if (fread(&bmp_ihdr->biClrUsed, 4, 1, fp) != 1)
return 0;
/* the number of color indexes that are required for displaying */
if (fread(&bmp_ihdr->biClrImportant, 4, 1, fp) != 1)
return 0;
return 1;
}
uint8*
TxImage::readBMP(FILE* fp, int* width, int* height, uint16* format)
{
/* NOTE: returned image format;
* 4, 8bit palette bmp -> GR_TEXFMT_P_8
* 24, 32bit bmp -> GR_TEXFMT_ARGB_8888
*/
uint8 *image = NULL;
uint8 *image_row = NULL;
uint8 *tmpimage = NULL;
int row_bytes, pos, i, j;
/* Windows Bitmap */
BITMAPFILEHEADER bmp_fhdr;
BITMAPINFOHEADER bmp_ihdr;
/* initialize */
*width = 0;
*height = 0;
*format = 0;
/* check if we have a valid bmp file */
if (!fp)
return NULL;
if (!getBMPInfo(fp, &bmp_fhdr, &bmp_ihdr)) {
INFO(80, L"error reading bitmap file! bitmap image is corrupt.\n");
return NULL;
}
DBG_INFO(80, L"bmp format %d x %d bitdepth:%d compression:%x offset:%d\n",
bmp_ihdr.biWidth, bmp_ihdr.biHeight, bmp_ihdr.biBitCount,
bmp_ihdr.biCompression, bmp_fhdr.bfOffBits);
/* rowStride in bytes */
row_bytes = (bmp_ihdr.biWidth * bmp_ihdr.biBitCount) >> 3;
/* align to 4bytes boundary */
row_bytes = (row_bytes + 3) & ~3;
/* Rice hi-res textures */
if (!(bmp_ihdr.biBitCount == 8 || bmp_ihdr.biBitCount == 4 || bmp_ihdr.biBitCount == 32 || bmp_ihdr.biBitCount == 24) ||
bmp_ihdr.biCompression != 0) {
DBG_INFO(80, L"Error: incompatible bitmap format!\n");
return NULL;
}
switch (bmp_ihdr.biBitCount) {
case 8:
case 32:
/* 8 bit, 32 bit bitmap */
image = (uint8*)malloc(row_bytes * bmp_ihdr.biHeight);
if (image) {
tmpimage = image;
pos = bmp_fhdr.bfOffBits + row_bytes * (bmp_ihdr.biHeight - 1);
for (i = 0; i < bmp_ihdr.biHeight; i++) {
/* read in image */
fseek(fp, pos, SEEK_SET);
fread(tmpimage, row_bytes, 1, fp);
tmpimage += row_bytes;
pos -= row_bytes;
}
}
break;
case 4:
/* 4bit bitmap */
image = (uint8*)malloc((row_bytes * bmp_ihdr.biHeight) << 1);
image_row = (uint8*)malloc(row_bytes);
if (image && image_row) {
tmpimage = image;
pos = bmp_fhdr.bfOffBits + row_bytes * (bmp_ihdr.biHeight - 1);
for (i = 0; i < bmp_ihdr.biHeight; i++) {
/* read in image */
fseek(fp, pos, SEEK_SET);
fread(image_row, row_bytes, 1, fp);
/* expand 4bpp to 8bpp. stuff 4bit values into 8bit comps. */
for (j = 0; j < row_bytes; j++) {
tmpimage[j << 1] = image_row[j] & 0x0f;
tmpimage[(j << 1) + 1] = (image_row[j] & 0xf0) >> 4;
}
tmpimage += (row_bytes << 1);
pos -= row_bytes;
}
free(image_row);
} else {
if (image_row) free(image_row);
if (image) free(image);
image = NULL;
}
break;
case 24:
/* 24 bit bitmap */
image = (uint8*)malloc((bmp_ihdr.biWidth * bmp_ihdr.biHeight) << 2);
image_row = (uint8*)malloc(row_bytes);
if (image && image_row) {
tmpimage = image;
pos = bmp_fhdr.bfOffBits + row_bytes * (bmp_ihdr.biHeight - 1);
for (i = 0; i < bmp_ihdr.biHeight; i++) {
/* read in image */
fseek(fp, pos, SEEK_SET);
fread(image_row, row_bytes, 1, fp);
/* convert 24bpp to 32bpp. */
for (j = 0; j < bmp_ihdr.biWidth; j++) {
tmpimage[(j << 2)] = image_row[j * 3];
tmpimage[(j << 2) + 1] = image_row[j * 3 + 1];
tmpimage[(j << 2) + 2] = image_row[j * 3 + 2];
tmpimage[(j << 2) + 3] = 0xFF;
}
tmpimage += (bmp_ihdr.biWidth << 2);
pos -= row_bytes;
}
free(image_row);
} else {
if (image_row) free(image_row);
if (image) free(image);
image = NULL;
}
}
if (image) {
*width = (row_bytes << 3) / bmp_ihdr.biBitCount;
*height = bmp_ihdr.biHeight;
switch (bmp_ihdr.biBitCount) {
case 8:
case 4:
*format = GR_TEXFMT_P_8;
break;
case 32:
case 24:
*format = GR_TEXFMT_ARGB_8888;
}
#if POW2_TEXTURES
/* next power of 2 size conversions */
/* NOTE: I can do this in the above loop for faster operations, but some
* texture packs require a workaround. see HACKALERT in nextPow2().
*/
TxReSample txReSample = new TxReSample; // XXX: temporary. move to a better place.
#if (POW2_TEXTURES == 2)
if (!txReSample->nextPow2(&image, width, height, 8, 1)) {
#else
if (!txReSample->nextPow2(&image, width, height, 8, 0)) {
#endif
if (image) {
free(image);
image = NULL;
}
*width = 0;
*height = 0;
*format = 0;
}
delete txReSample;
#endif /* POW2_TEXTURES */
}
#ifdef DEBUG
if (!image) {
DBG_INFO(80, L"Error: failed to load bmp image!\n");
}
#endif
return image;
}
boolean
TxImage::getDDSInfo(FILE *fp, DDSFILEHEADER *dds_fhdr)
{
/*
* read in DDSFILEHEADER
*/
/* is this a DDS file? */
if (fread(&dds_fhdr->dwMagic, 4, 1, fp) != 1)
return 0;
if (memcmp(&dds_fhdr->dwMagic, "DDS ", 4) != 0)
return 0;
if (fread(&dds_fhdr->dwSize, 4, 1, fp) != 1)
return 0;
/* get file flags */
if (fread(&dds_fhdr->dwFlags, 4, 1, fp) != 1)
return 0;
/* height of dds in pixels */
if (fread(&dds_fhdr->dwHeight, 4, 1, fp) != 1)
return 0;
/* width of dds in pixels */
if (fread(&dds_fhdr->dwWidth, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwLinearSize, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwDepth, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwMipMapCount, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwReserved1, 4 * 11, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwSize, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwFlags, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwFourCC, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwRGBBitCount, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwRBitMask, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwGBitMask, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwBBitMask, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->ddpf.dwRGBAlphaBitMask, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwCaps1, 4, 1, fp) != 1)
return 0;
if (fread(&dds_fhdr->dwCaps2, 4, 1, fp) != 1)
return 0;
return 1;
}
uint8*
TxImage::readDDS(FILE* fp, int* width, int* height, uint16* format)
{
uint8 *image = NULL;
DDSFILEHEADER dds_fhdr;
uint16 tmpformat = 0;
/* initialize */
*width = 0;
*height = 0;
*format = 0;
/* check if we have a valid dds file */
if (!fp)
return NULL;
if (!getDDSInfo(fp, &dds_fhdr)) {
INFO(80, L"error reading dds file! dds image is corrupt.\n");
return NULL;
}
DBG_INFO(80, L"dds format %d x %d HeaderSize %d LinearSize %d\n",
dds_fhdr.dwWidth, dds_fhdr.dwHeight, dds_fhdr.dwSize, dds_fhdr.dwLinearSize);
if (!(dds_fhdr.dwFlags & (DDSD_CAPS|DDSD_WIDTH|DDSD_HEIGHT|DDSD_PIXELFORMAT|DDSD_LINEARSIZE))) {
DBG_INFO(80, L"Error: incompatible dds format!\n");
return NULL;
}
if ((dds_fhdr.dwFlags & DDSD_MIPMAPCOUNT) && dds_fhdr.dwMipMapCount != 1) {
DBG_INFO(80, L"Error: mipmapped dds not supported!\n");
return NULL;
}
if (!((dds_fhdr.ddpf.dwFlags & DDPF_FOURCC) && dds_fhdr.dwCaps2 == 0)) {
DBG_INFO(80, L"Error: not fourcc standard texture!\n");
return NULL;
}
if (memcmp(&dds_fhdr.ddpf.dwFourCC, "DXT1", 4) == 0) {
DBG_INFO(80, L"DXT1 format\n");
/* compensate for missing LinearSize */
dds_fhdr.dwLinearSize = (dds_fhdr.dwWidth * dds_fhdr.dwHeight) >> 1;
tmpformat = GR_TEXFMT_ARGB_CMP_DXT1;
} else if (memcmp(&dds_fhdr.ddpf.dwFourCC, "DXT3", 4) == 0) {
DBG_INFO(80, L"DXT3 format\n");
dds_fhdr.dwLinearSize = dds_fhdr.dwWidth * dds_fhdr.dwHeight;
tmpformat = GR_TEXFMT_ARGB_CMP_DXT3;
} else if (memcmp(&dds_fhdr.ddpf.dwFourCC, "DXT5", 4) == 0) {
DBG_INFO(80, L"DXT5 format\n");
dds_fhdr.dwLinearSize = dds_fhdr.dwWidth * dds_fhdr.dwHeight;
tmpformat = GR_TEXFMT_ARGB_CMP_DXT5;
} else {
DBG_INFO(80, L"Error: not DXT1 or DXT3 or DXT5 format!\n");
return NULL;
}
/* read in image */
image = (uint8*)malloc(dds_fhdr.dwLinearSize);
if (image) {
*width = dds_fhdr.dwWidth;
*height = dds_fhdr.dwHeight;
*format = tmpformat;
fseek(fp, 128, SEEK_SET); /* size of header is 128 bytes */
fread(image, dds_fhdr.dwLinearSize, 1, fp);
}
return image;
}
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