+++ /dev/null
-Add Kodi-specific patch
-
-Kodi 15.0 contains an updated version of libsquish:
-https://github.com/xbmc/xbmc/tree/master/tools/depends/native/libsquish-native
-
-The OpenElec project provides a separate tarball including the Kodi-
-specific patches:
-http://sources.openelec.tv/devel/libsquish-1.10-openelec.tar.gz
-
-This patch contains the relevant diff between upstream libsquish 1.13
-and the OpenElec tarball.
-
-Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
-
-diff -uwNr 1.13/squish.cpp libsquish-1.10-openelec/squish.cpp
---- 1.13/squish.cpp 2015-04-30 12:48:49.000000000 +0200
-+++ libsquish-1.10-openelec/squish.cpp 2015-01-09 10:58:43.000000000 +0100
-@@ -23,6 +23,7 @@
-
- -------------------------------------------------------------------------- */
-
-+#include <string.h>
- #include <squish.h>
- #include "colourset.h"
- #include "maths.h"
-@@ -39,7 +40,7 @@
- // grab the flag bits
- int method = flags & ( kDxt1 | kDxt3 | kDxt5 );
- int fit = flags & ( kColourIterativeClusterFit | kColourClusterFit | kColourRangeFit );
-- int extra = flags & kWeightColourByAlpha;
-+ int extra = flags & ( kWeightColourByAlpha | kSourceBGRA );
-
- // set defaults
- if( method != kDxt3 && method != kDxt5 )
-@@ -124,8 +125,30 @@
- return blockcount*blocksize;
- }
-
-+void CopyRGBA( u8 const* source, u8* dest, int flags )
-+{
-+ if (flags & kSourceBGRA)
-+ {
-+ // convert from bgra to rgba
-+ dest[0] = source[2];
-+ dest[1] = source[1];
-+ dest[2] = source[0];
-+ dest[3] = source[3];
-+ }
-+ else
-+ {
-+ for( int i = 0; i < 4; ++i )
-+ *dest++ = *source++;
-+ }
-+}
-+
- void CompressImage( u8 const* rgba, int width, int height, void* blocks, int flags, float* metric )
- {
-+ CompressImage(rgba, width, height, width*4, blocks, flags, metric);
-+}
-+
-+void CompressImage( u8 const* rgba, int width, int height, int pitch, void* blocks, int flags, float* metric )
-+{
- // fix any bad flags
- flags = FixFlags( flags );
-
-@@ -154,20 +177,14 @@
- if( sx < width && sy < height )
- {
- // copy the rgba value
-- u8 const* sourcePixel = rgba + 4*( width*sy + sx );
-- for( int i = 0; i < 4; ++i )
-- *targetPixel++ = *sourcePixel++;
--
-+ u8 const* sourcePixel = rgba + pitch*sy + 4*sx;
-+ CopyRGBA(sourcePixel, targetPixel, flags);
- // enable this pixel
- mask |= ( 1 << ( 4*py + px ) );
- }
-- else
-- {
-- // skip this pixel as its outside the image
- targetPixel += 4;
- }
- }
-- }
-
- // compress it into the output
- CompressMasked( sourceRgba, mask, targetBlock, flags, metric );
-@@ -180,6 +197,11 @@
-
- void DecompressImage( u8* rgba, int width, int height, void const* blocks, int flags )
- {
-+ DecompressImage( rgba, width, height, width*4, blocks, flags );
-+}
-+
-+void DecompressImage( u8* rgba, int width, int height, int pitch, void const* blocks, int flags )
-+{
- // fix any bad flags
- flags = FixFlags( flags );
-
-@@ -207,24 +229,132 @@
- int sy = y + py;
- if( sx < width && sy < height )
- {
-- u8* targetPixel = rgba + 4*( width*sy + sx );
-+ u8* targetPixel = rgba + pitch*sy + 4*sx;
-
- // copy the rgba value
-+ CopyRGBA(sourcePixel, targetPixel, flags);
-+ }
-+ sourcePixel += 4;
-+ }
-+ }
-+
-+ // advance
-+ sourceBlock += bytesPerBlock;
-+ }
-+ }
-+}
-+
-+static double ErrorSq(double x, double y)
-+{
-+ return (x - y) * (x - y);
-+}
-+
-+static void ComputeBlockWMSE(u8 const *original, u8 const *compressed, unsigned int w, unsigned int h, double &cmse, double &amse)
-+{
-+ // Computes the MSE for the block and weights it by the variance of the original block.
-+ // If the variance of the original block is less than 4 (i.e. a standard deviation of 1 per channel)
-+ // then the block is close to being a single colour. Quantisation errors in single colour blocks
-+ // are easier to see than similar errors in blocks that contain more colours, particularly when there
-+ // are many such blocks in a large area (eg a blue sky background) as they cause banding. Given that
-+ // banding is easier to see than small errors in "complex" blocks, we weight the errors by a factor
-+ // of 5. This implies that images with large, single colour areas will have a higher potential WMSE
-+ // than images with lots of detail.
-+
-+ cmse = amse = 0;
-+ unsigned int sum_p[4]; // per channel sum of pixels
-+ unsigned int sum_p2[4]; // per channel sum of pixels squared
-+ memset(sum_p, 0, sizeof(sum_p));
-+ memset(sum_p2, 0, sizeof(sum_p2));
-+ for( unsigned int py = 0; py < 4; ++py )
-+ {
-+ for( unsigned int px = 0; px < 4; ++px )
-+ {
-+ if( px < w && py < h )
-+ {
-+ double pixelCMSE = 0;
-+ for( int i = 0; i < 3; ++i )
-+ {
-+ pixelCMSE += ErrorSq(original[i], compressed[i]);
-+ sum_p[i] += original[i];
-+ sum_p2[i] += (unsigned int)original[i]*original[i];
-+ }
-+ if( original[3] == 0 && compressed[3] == 0 )
-+ pixelCMSE = 0; // transparent in both, so colour is inconsequential
-+ amse += ErrorSq(original[3], compressed[3]);
-+ cmse += pixelCMSE;
-+ sum_p[3] += original[3];
-+ sum_p2[3] += (unsigned int)original[3]*original[3];
-+ }
-+ original += 4;
-+ compressed += 4;
-+ }
-+ }
-+ unsigned int variance = 0;
- for( int i = 0; i < 4; ++i )
-- *targetPixel++ = *sourcePixel++;
-+ variance += w*h*sum_p2[i] - sum_p[i]*sum_p[i];
-+ if( variance < 4 * w * w * h * h )
-+ {
-+ amse *= 5;
-+ cmse *= 5;
- }
-- else
-+}
-+
-+void ComputeMSE( u8 const *rgba, int width, int height, u8 const *dxt, int flags, double &colourMSE, double &alphaMSE )
- {
-- // skip this pixel as its outside the image
-- sourcePixel += 4;
-+ ComputeMSE(rgba, width, height, width*4, dxt, flags, colourMSE, alphaMSE);
-+}
-+
-+void ComputeMSE( u8 const *rgba, int width, int height, int pitch, u8 const *dxt, int flags, double &colourMSE, double &alphaMSE )
-+{
-+ // fix any bad flags
-+ flags = FixFlags( flags );
-+ colourMSE = alphaMSE = 0;
-+
-+ // initialise the block input
-+ squish::u8 const* sourceBlock = dxt;
-+ int bytesPerBlock = ( ( flags & squish::kDxt1 ) != 0 ) ? 8 : 16;
-+
-+ // loop over blocks
-+ for( int y = 0; y < height; y += 4 )
-+ {
-+ for( int x = 0; x < width; x += 4 )
-+ {
-+ // decompress the block
-+ u8 targetRgba[4*16];
-+ Decompress( targetRgba, sourceBlock, flags );
-+ u8 const* sourcePixel = targetRgba;
-+
-+ // copy across to a similar pixel block
-+ u8 originalRgba[4*16];
-+ u8* originalPixel = originalRgba;
-+
-+ for( int py = 0; py < 4; ++py )
-+ {
-+ for( int px = 0; px < 4; ++px )
-+ {
-+ int sx = x + px;
-+ int sy = y + py;
-+ if( sx < width && sy < height )
-+ {
-+ u8 const* targetPixel = rgba + pitch*sy + 4*sx;
-+ CopyRGBA(targetPixel, originalPixel, flags);
- }
-+ sourcePixel += 4;
-+ originalPixel += 4;
- }
- }
-
-+ // compute the weighted MSE of the block
-+ double blockCMSE, blockAMSE;
-+ ComputeBlockWMSE(originalRgba, targetRgba, std::min(4, width - x), std::min(4, height - y), blockCMSE, blockAMSE);
-+ colourMSE += blockCMSE;
-+ alphaMSE += blockAMSE;
- // advance
- sourceBlock += bytesPerBlock;
- }
- }
-+ colourMSE /= (width * height * 3);
-+ alphaMSE /= (width * height);
- }
-
- } // namespace squish
-diff -uwNr 1.13/squish.h libsquish-1.10-openelec/squish.h
---- 1.13/squish.h 2015-04-30 12:55:27.000000000 +0200
-+++ libsquish-1.10-openelec/squish.h 2015-01-09 10:58:43.000000000 +0100
-@@ -57,7 +57,10 @@
- kColourRangeFit = ( 1 << 4 ),
-
- //! Weight the colour by alpha during cluster fit (disabled by default).
-- kWeightColourByAlpha = ( 1 << 7 )
-+ kWeightColourByAlpha = ( 1 << 7 ),
-+
-+ //! Source is BGRA rather than RGBA
-+ kSourceBGRA = ( 1 << 9 ),
- };
-
- // -----------------------------------------------------------------------------
-@@ -194,6 +197,7 @@
- @param rgba The pixels of the source.
- @param width The width of the source image.
- @param height The height of the source image.
-+ @param pitch The pitch of the source image.
- @param blocks Storage for the compressed output.
- @param flags Compression flags.
- @param metric An optional perceptual metric.
-@@ -231,6 +235,7 @@
- to allocate for the compressed output.
- */
- void CompressImage( u8 const* rgba, int width, int height, void* blocks, int flags, float* metric = 0 );
-+void CompressImage( u8 const* rgba, int width, int height, int pitch, void* blocks, int flags, float* metric = 0 );
-
- // -----------------------------------------------------------------------------
-
-@@ -239,6 +244,7 @@
- @param rgba Storage for the decompressed pixels.
- @param width The width of the source image.
- @param height The height of the source image.
-+ @param pitch The pitch of the decompressed pixels.
- @param blocks The compressed DXT blocks.
- @param flags Compression flags.
-
-@@ -254,6 +260,32 @@
- Internally this function calls squish::Decompress for each block.
- */
- void DecompressImage( u8* rgba, int width, int height, void const* blocks, int flags );
-+void DecompressImage( u8* rgba, int width, int height, int pitch, void const* blocks, int flags );
-+
-+// -----------------------------------------------------------------------------
-+
-+/*! @brief Computes MSE of an compressed image in memory.
-+
-+ @param rgba The original image pixels.
-+ @param width The width of the source image.
-+ @param height The height of the source image.
-+ @param pitch The pitch of the source image.
-+ @param dxt The compressed dxt blocks
-+ @param flags Compression flags.
-+ @param colourMSE The MSE of the colour values.
-+ @param alphaMSE The MSE of the alpha values.
-+
-+ The colour MSE and alpha MSE are computed across all pixels. The colour MSE is
-+ averaged across all rgb values (i.e. colourMSE = sum sum_k ||dxt.k - rgba.k||/3)
-+
-+ The flags parameter should specify either kDxt1, kDxt3 or kDxt5 compression,
-+ however, DXT1 will be used by default if none is specified. All other flags
-+ are ignored.
-+
-+ Internally this function calls squish::Decompress for each block.
-+*/
-+void ComputeMSE(u8 const *rgba, int width, int height, u8 const *dxt, int flags, double &colourMSE, double &alphaMSE);
-+void ComputeMSE(u8 const *rgba, int width, int height, int pitch, u8 const *dxt, int flags, double &colourMSE, double &alphaMSE);
-
- // -----------------------------------------------------------------------------
-
-diff -uwNr 1.13/squish.pc.in libsquish-1.10-openelec/squish.pc.in
---- 1.13/squish.pc 1970-01-01 01:00:00.000000000 +0100
-+++ libsquish-1.10-openelec/squish.pc 2015-01-09 10:58:43.000000000 +0100
-@@ -0,0 +1,13 @@
-+prefix=/usr
-+exec_prefix=${prefix}
-+libdir=${prefix}/lib
-+sharedlibdir=${libdir}
-+includedir=${prefix}/include
-+
-+Name: squish
-+Description: squish DXT lib
-+Version: 1.1.3-kodi
-+
-+Requires:
-+Libs: -L${libdir} -L${sharedlibdir} -lsquish
-+Cflags: -I${includedir}
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