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author | Tarja Sundqvist <tarja.sundqvist@qt.io> | 2023-03-23 16:00:10 +0200 |
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committer | Tarja Sundqvist <tarja.sundqvist@qt.io> | 2023-03-23 16:00:10 +0200 |
commit | 1f67161fea6beb2ed4c09849abe446c6a880af8a (patch) | |
tree | cffe8116a49f76c8e5d521af9298631e0d2a6130 /src/3rdparty/libwebp/src/demux/anim_decode.c | |
parent | 2dcf2899b022accfef5cede1c2ea3dda2d0d6a4a (diff) | |
parent | c4b95acf2d1da93730c7624033a17f19e239d111 (diff) | |
download | qtimageformats-1f67161fea6beb2ed4c09849abe446c6a880af8a.tar.gz |
Merge remote-tracking branch 'origin/tqtc/lts-5.15.9' into tqtc/lts-5.15-opensourcev5.15.9-lts-lgpl5.15
Change-Id: Ieb442937b0cc31e15b39401f2a3234b99751d169
Diffstat (limited to 'src/3rdparty/libwebp/src/demux/anim_decode.c')
-rw-r--r-- | src/3rdparty/libwebp/src/demux/anim_decode.c | 40 |
1 files changed, 24 insertions, 16 deletions
diff --git a/src/3rdparty/libwebp/src/demux/anim_decode.c b/src/3rdparty/libwebp/src/demux/anim_decode.c index 2bf4dcf..e077ffb 100644 --- a/src/3rdparty/libwebp/src/demux/anim_decode.c +++ b/src/3rdparty/libwebp/src/demux/anim_decode.c @@ -23,6 +23,14 @@ #define NUM_CHANNELS 4 +// Channel extraction from a uint32_t representation of a uint8_t RGBA/BGRA +// buffer. +#ifdef WORDS_BIGENDIAN +#define CHANNEL_SHIFT(i) (24 - (i) * 8) +#else +#define CHANNEL_SHIFT(i) ((i) * 8) +#endif + typedef void (*BlendRowFunc)(uint32_t* const, const uint32_t* const, int); static void BlendPixelRowNonPremult(uint32_t* const src, const uint32_t* const dst, int num_pixels); @@ -209,35 +217,35 @@ static uint8_t BlendChannelNonPremult(uint32_t src, uint8_t src_a, const uint8_t dst_channel = (dst >> shift) & 0xff; const uint32_t blend_unscaled = src_channel * src_a + dst_channel * dst_a; assert(blend_unscaled < (1ULL << 32) / scale); - return (blend_unscaled * scale) >> 24; + return (blend_unscaled * scale) >> CHANNEL_SHIFT(3); } // Blend 'src' over 'dst' assuming they are NOT pre-multiplied by alpha. static uint32_t BlendPixelNonPremult(uint32_t src, uint32_t dst) { - const uint8_t src_a = (src >> 24) & 0xff; + const uint8_t src_a = (src >> CHANNEL_SHIFT(3)) & 0xff; if (src_a == 0) { return dst; } else { - const uint8_t dst_a = (dst >> 24) & 0xff; + const uint8_t dst_a = (dst >> CHANNEL_SHIFT(3)) & 0xff; // This is the approximate integer arithmetic for the actual formula: // dst_factor_a = (dst_a * (255 - src_a)) / 255. const uint8_t dst_factor_a = (dst_a * (256 - src_a)) >> 8; const uint8_t blend_a = src_a + dst_factor_a; const uint32_t scale = (1UL << 24) / blend_a; - const uint8_t blend_r = - BlendChannelNonPremult(src, src_a, dst, dst_factor_a, scale, 0); - const uint8_t blend_g = - BlendChannelNonPremult(src, src_a, dst, dst_factor_a, scale, 8); - const uint8_t blend_b = - BlendChannelNonPremult(src, src_a, dst, dst_factor_a, scale, 16); + const uint8_t blend_r = BlendChannelNonPremult( + src, src_a, dst, dst_factor_a, scale, CHANNEL_SHIFT(0)); + const uint8_t blend_g = BlendChannelNonPremult( + src, src_a, dst, dst_factor_a, scale, CHANNEL_SHIFT(1)); + const uint8_t blend_b = BlendChannelNonPremult( + src, src_a, dst, dst_factor_a, scale, CHANNEL_SHIFT(2)); assert(src_a + dst_factor_a < 256); - return (blend_r << 0) | - (blend_g << 8) | - (blend_b << 16) | - ((uint32_t)blend_a << 24); + return ((uint32_t)blend_r << CHANNEL_SHIFT(0)) | + ((uint32_t)blend_g << CHANNEL_SHIFT(1)) | + ((uint32_t)blend_b << CHANNEL_SHIFT(2)) | + ((uint32_t)blend_a << CHANNEL_SHIFT(3)); } } @@ -247,7 +255,7 @@ static void BlendPixelRowNonPremult(uint32_t* const src, const uint32_t* const dst, int num_pixels) { int i; for (i = 0; i < num_pixels; ++i) { - const uint8_t src_alpha = (src[i] >> 24) & 0xff; + const uint8_t src_alpha = (src[i] >> CHANNEL_SHIFT(3)) & 0xff; if (src_alpha != 0xff) { src[i] = BlendPixelNonPremult(src[i], dst[i]); } @@ -264,7 +272,7 @@ static WEBP_INLINE uint32_t ChannelwiseMultiply(uint32_t pix, uint32_t scale) { // Blend 'src' over 'dst' assuming they are pre-multiplied by alpha. static uint32_t BlendPixelPremult(uint32_t src, uint32_t dst) { - const uint8_t src_a = (src >> 24) & 0xff; + const uint8_t src_a = (src >> CHANNEL_SHIFT(3)) & 0xff; return src + ChannelwiseMultiply(dst, 256 - src_a); } @@ -274,7 +282,7 @@ static void BlendPixelRowPremult(uint32_t* const src, const uint32_t* const dst, int num_pixels) { int i; for (i = 0; i < num_pixels; ++i) { - const uint8_t src_alpha = (src[i] >> 24) & 0xff; + const uint8_t src_alpha = (src[i] >> CHANNEL_SHIFT(3)) & 0xff; if (src_alpha != 0xff) { src[i] = BlendPixelPremult(src[i], dst[i]); } |