xBRZ 1.3 filter update by chrono, zenju

https://sourceforge.net/projects/xbrz/


git-svn-id: https://svn.code.sf.net/p/vbam/code/trunk@1290 a31d4220-a93d-0410-bf67-fe4944624d44

src/filters/xBRZ/config.h

@@ -1,6 +1,6 @@
 // ****************************************************************************
 // * This file is part of the HqMAME project. It is distributed under         *
-// * GNU General Public License: http://www.gnu.org/licenses/gpl.html         *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0          *
 // * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved          *
 // *                                                                          *
 // * Additionally and as a special exception, the author gives permission     *

src/filters/xBRZ/xbrz.h

@@ -1,6 +1,6 @@
 // ****************************************************************************
 // * This file is part of the HqMAME project. It is distributed under         *
-// * GNU General Public License: http://www.gnu.org/licenses/gpl.html         *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0          *
 // * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved          *
 // *                                                                          *
 // * Additionally and as a special exception, the author gives permission     *
@@ -30,14 +30,21 @@ namespace xbrz
 using a modified approach of xBR:
 http://board.byuu.org/viewtopic.php?f=10&t=2248
 - new rule set preserving small image features
+- highly optimized for performance
+- support alpha channel
 - support multithreading
-- support 64 bit architectures
+- support 64-bit architectures
 - support processing image slices
 */
 
+enum ColorFormat //from high bits -> low bits, 8 bit per channel
+{
+    ARGB, //including alpha channel, BGRA byte order on little-endian machines
+    RGB,  //8 bit for each red, green, blue, upper 8 bits unused
+};
+
 /*
 -> map source (srcWidth * srcHeight) to target (scale * width x scale * height) image, optionally processing a half-open slice of rows [yFirst, yLast) only
--> color format: ARGB (BGRA byte order), alpha channel unused
 -> support for source/target pitch in bytes!
 -> if your emulator changes only a few image slices during each cycle (e.g. DOSBox) then there's no need to run xBRZ on the complete image:
    Just make sure you enlarge the source image slice by 2 rows on top and 2 on bottom (this is the additional range the xBRZ algorithm is using during analysis)
@@ -45,11 +52,12 @@ http://board.byuu.org/viewtopic.php?f=10&t=2248
    in the target image data if you are using multiple threads for processing each enlarged slice!
 
 THREAD-SAFETY: - parts of the same image may be scaled by multiple threads as long as the [yFirst, yLast) ranges do not overlap!
-               - there is a minor inefficiency for the first row of a slice, so avoid processing single rows only
+               - there is a minor inefficiency for the first row of a slice, so avoid processing single rows only; suggestion: process 6 rows at least
 */
 void scale(size_t factor, //valid range: 2 - 5
            const uint32_t* src, int srcWidth, int srcHeight, int srcPitch,
            uint32_t* trg, int trgPitch,
+           ColorFormat colFmt,
            const ScalerCfg& cfg = ScalerCfg(),
            int yFirst = 0, int yLast = std::numeric_limits<int>::max()); //slice of source image
 
@@ -66,7 +74,7 @@ void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight, int
                           SliceType st, int yFirst, int yLast);
 
 //parameter tuning
-bool equalColorTest(uint32_t col1, uint32_t col2, double luminanceWeight, double equalColorTolerance);
+bool equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, double luminanceWeight, double equalColorTolerance);
 
 
 

src/filters/xbrzfilter.cpp

@@ -4,20 +4,20 @@
 
 void xbrz2x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
 {
-    xbrz::scale(2, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+    xbrz::scale(2, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch, xbrz::RGB);
 }
 
 void xbrz3x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
 {
-    xbrz::scale(3, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+    xbrz::scale(3, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch, xbrz::RGB);
 }
 
 void xbrz4x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
 {
-    xbrz::scale(4, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+    xbrz::scale(4, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch, xbrz::RGB);
 }
 
 void xbrz5x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
 {
-    xbrz::scale(5, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+    xbrz::scale(5, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch, xbrz::RGB);
 }