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-rw-r--r--gfx/skia/patches/archive/0008-Bug-687188-Skia-radial-gradients.patch173
1 files changed, 173 insertions, 0 deletions
diff --git a/gfx/skia/patches/archive/0008-Bug-687188-Skia-radial-gradients.patch b/gfx/skia/patches/archive/0008-Bug-687188-Skia-radial-gradients.patch
new file mode 100644
index 0000000000..0f60dbd8ea
--- /dev/null
+++ b/gfx/skia/patches/archive/0008-Bug-687188-Skia-radial-gradients.patch
@@ -0,0 +1,173 @@
+From f941ea32e44a2436d235e83ef1a434289a9d9c1e Mon Sep 17 00:00:00 2001
+From: George Wright <gwright@mozilla.com>
+Date: Wed, 23 May 2012 11:40:25 -0400
+Subject: [PATCH 08/10] Bug 755869 - [11] Re-apply bug 687188 - Skia
+ radial gradients should use the 0/1 color stop values
+ for clamping. r=mattwoodrow
+
+---
+ gfx/skia/src/effects/SkGradientShader.cpp | 76 +++++++++++++++++++++++------
+ 1 files changed, 61 insertions(+), 15 deletions(-)
+
+diff --git a/gfx/skia/src/effects/SkGradientShader.cpp b/gfx/skia/src/effects/SkGradientShader.cpp
+index 59ba48c..ea05a39 100644
+--- a/gfx/skia/src/effects/SkGradientShader.cpp
++++ b/gfx/skia/src/effects/SkGradientShader.cpp
+@@ -204,6 +204,7 @@ private:
+ mutable SkMallocPixelRef* fCache32PixelRef;
+ mutable unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value
+
++ static SkPMColor PremultiplyColor(SkColor c0, U8CPU alpha);
+ static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count);
+ static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count,
+ U8CPU alpha);
+@@ -507,6 +508,21 @@ static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) {
+ return ((n << 1) - (n | (n >> 8))) >> 8;
+ }
+
++SkPMColor Gradient_Shader::PremultiplyColor(SkColor c0, U8CPU paintAlpha)
++{
++ SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha);
++ SkFixed r = SkColorGetR(c0);
++ SkFixed g = SkColorGetG(c0);
++ SkFixed b = SkColorGetB(c0);
++
++ a = SkIntToFixed(a) + 0x8000;
++ r = SkIntToFixed(r) + 0x8000;
++ g = SkIntToFixed(g) + 0x8000;
++ b = SkIntToFixed(b) + 0x8000;
++
++ return SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16);
++}
++
+ void Gradient_Shader::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1,
+ int count, U8CPU paintAlpha) {
+ SkASSERT(count > 1);
+@@ -628,14 +644,14 @@ static void complete_32bit_cache(SkPMColor* cache, int stride) {
+ const SkPMColor* Gradient_Shader::getCache32() const {
+ if (fCache32 == NULL) {
+ // double the count for dither entries
+- const int entryCount = kCache32Count * 2;
++ const int entryCount = kCache32Count * 2 + 2;
+ const size_t allocSize = sizeof(SkPMColor) * entryCount;
+
+ if (NULL == fCache32PixelRef) {
+ fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef,
+ (NULL, allocSize, NULL));
+ }
+- fCache32 = (SkPMColor*)fCache32PixelRef->getAddr();
++ fCache32 = (SkPMColor*)fCache32PixelRef->getAddr() + 1;
+ if (fColorCount == 2) {
+ Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1],
+ kGradient32Length, fCacheAlpha);
+@@ -659,7 +675,7 @@ const SkPMColor* Gradient_Shader::getCache32() const {
+ SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef,
+ (NULL, allocSize, NULL));
+ SkPMColor* linear = fCache32; // just computed linear data
+- SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data
++ SkPMColor* mapped = (SkPMColor*)newPR->getAddr() + 1; // storage for mapped data
+ SkUnitMapper* map = fMapper;
+ for (int i = 0; i < kGradient32Length; i++) {
+ int index = map->mapUnit16((i << 8) | i) >> 8;
+@@ -668,10 +684,13 @@ const SkPMColor* Gradient_Shader::getCache32() const {
+ }
+ fCache32PixelRef->unref();
+ fCache32PixelRef = newPR;
+- fCache32 = (SkPMColor*)newPR->getAddr();
++ fCache32 = (SkPMColor*)newPR->getAddr() + 1;
+ }
+ complete_32bit_cache(fCache32, kCache32Count);
+ }
++ //Write the clamp colours into the first and last entries of fCache32
++ fCache32[-1] = PremultiplyColor(fOrigColors[0], fCacheAlpha);
++ fCache32[kCache32Count * 2] = PremultiplyColor(fOrigColors[fColorCount - 1], fCacheAlpha);
+ return fCache32;
+ }
+
+@@ -857,6 +876,18 @@ void shadeSpan_linear_vertical(TileProc proc, SkFixed dx, SkFixed fx,
+ SkPMColor* SK_RESTRICT dstC,
+ const SkPMColor* SK_RESTRICT cache,
+ int toggle, int count) {
++ if (proc == clamp_tileproc) {
++ // Read out clamp values from beginning/end of the cache. No need to lerp
++ // or dither
++ if (fx < 0) {
++ sk_memset32(dstC, cache[-1], count);
++ return;
++ } else if (fx > 0xFFFF) {
++ sk_memset32(dstC, cache[Gradient_Shader::kCache32Count * 2], count);
++ return;
++ }
++ }
++
+ // We're a vertical gradient, so no change in a span.
+ // If colors change sharply across the gradient, dithering is
+ // insufficient (it subsamples the color space) and we need to lerp.
+@@ -875,6 +906,18 @@ void shadeSpan_linear_vertical_lerp(TileProc proc, SkFixed dx, SkFixed fx,
+ SkPMColor* SK_RESTRICT dstC,
+ const SkPMColor* SK_RESTRICT cache,
+ int toggle, int count) {
++ if (proc == clamp_tileproc) {
++ // Read out clamp values from beginning/end of the cache. No need to lerp
++ // or dither
++ if (fx < 0) {
++ sk_memset32(dstC, cache[-1], count);
++ return;
++ } else if (fx > 0xFFFF) {
++ sk_memset32(dstC, cache[Gradient_Shader::kCache32Count * 2], count);
++ return;
++ }
++ }
++
+ // We're a vertical gradient, so no change in a span.
+ // If colors change sharply across the gradient, dithering is
+ // insufficient (it subsamples the color space) and we need to lerp.
+@@ -900,10 +943,8 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
+ range.init(fx, dx, count, 0, Gradient_Shader::kGradient32Length);
+
+ if ((count = range.fCount0) > 0) {
+- sk_memset32_dither(dstC,
+- cache[toggle + range.fV0],
+- cache[(toggle ^ Gradient_Shader::kDitherStride32) + range.fV0],
+- count);
++ // Shouldn't be any need to dither for clamping?
++ sk_memset32(dstC, cache[-1], count);
+ dstC += count;
+ }
+ if ((count = range.fCount1) > 0) {
+@@ -922,10 +963,8 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
+ }
+ }
+ if ((count = range.fCount2) > 0) {
+- sk_memset32_dither(dstC,
+- cache[toggle + range.fV1],
+- cache[(toggle ^ Gradient_Shader::kDitherStride32) + range.fV1],
+- count);
++ // Shouldn't be any need to dither for clamping?
++ sk_memset32(dstC, cache[Gradient_Shader::kCache32Count * 2], count);
+ }
+ }
+
+@@ -1796,9 +1835,16 @@ void shadeSpan_twopoint_clamp(SkScalar fx, SkScalar dx,
+ for (; count > 0; --count) {
+ SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura,
+ fOneOverTwoA, posRoot);
+- SkFixed index = SkClampMax(t, 0xFFFF);
+- SkASSERT(index <= 0xFFFF);
+- *dstC++ = cache[index >> Gradient_Shader::kCache32Shift];
++
++ if (t < 0) {
++ *dstC++ = cache[-1];
++ } else if (t > 0xFFFF) {
++ *dstC++ = cache[Gradient_Shader::kCache32Count * 2];
++ } else {
++ SkASSERT(t <= 0xFFFF);
++ *dstC++ = cache[t >> Gradient_Shader::kCache32Shift];
++ }
++
+ fx += dx;
+ fy += dy;
+ b += db;
+--
+1.7.5.4
+
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