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-rw-r--r--gfx/skia/patches/archive/fix-gradient-clamp.patch211
1 files changed, 211 insertions, 0 deletions
diff --git a/gfx/skia/patches/archive/fix-gradient-clamp.patch b/gfx/skia/patches/archive/fix-gradient-clamp.patch
new file mode 100644
index 0000000000..91481c2c12
--- /dev/null
+++ b/gfx/skia/patches/archive/fix-gradient-clamp.patch
@@ -0,0 +1,211 @@
+diff --git a/gfx/skia/src/effects/SkGradientShader.cpp b/gfx/skia/src/effects/SkGradientShader.cpp
+--- a/gfx/skia/src/effects/SkGradientShader.cpp
++++ b/gfx/skia/src/effects/SkGradientShader.cpp
+@@ -167,16 +167,17 @@ private:
+
+ mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values
+ mutable SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values
+
+ mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand
+ 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);
+ void setCacheAlpha(U8CPU alpha) const;
+ void initCommon();
+
+ typedef SkShader INHERITED;
+ };
+@@ -512,16 +513,31 @@ static inline U8CPU dither_fixed_to_8(Sk
+ * For dithering with premultiply, we want to ceiling the alpha component,
+ * to ensure that it is always >= any color component.
+ */
+ static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) {
+ n >>= 8;
+ 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);
+
+ // need to apply paintAlpha to our two endpoints
+ SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha);
+ SkFixed da;
+ {
+@@ -613,24 +629,24 @@ const uint16_t* Gradient_Shader::getCach
+ }
+ }
+ return fCache16;
+ }
+
+ 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],
+ kCache32Count, fCacheAlpha);
+ } else {
+ Rec* rec = fRecs;
+ int prevIndex = 0;
+ for (int i = 1; i < fColorCount; i++) {
+ int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits);
+@@ -644,28 +660,31 @@ const SkPMColor* Gradient_Shader::getCac
+ }
+ SkASSERT(prevIndex == kCache32Count - 1);
+ }
+
+ if (fMapper) {
+ 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 < kCache32Count; i++) {
+ int index = map->mapUnit16((i << 8) | i) >> 8;
+ mapped[i] = linear[index];
+ mapped[i + kCache32Count] = linear[index + kCache32Count];
+ }
+ fCache32PixelRef->unref();
+ fCache32PixelRef = newPR;
+- fCache32 = (SkPMColor*)newPR->getAddr();
++ fCache32 = (SkPMColor*)newPR->getAddr() + 1;
+ }
+ }
++ //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;
+ }
+
+ /*
+ * Because our caller might rebuild the same (logically the same) gradient
+ * over and over, we'd like to return exactly the same "bitmap" if possible,
+ * allowing the client to utilize a cache of our bitmap (e.g. with a GPU).
+ * To do that, we maintain a private cache of built-bitmaps, based on our
+@@ -875,28 +894,38 @@ void Linear_Gradient::shadeSpan(int x, i
+ dx = dxStorage[0];
+ } else {
+ SkASSERT(fDstToIndexClass == kLinear_MatrixClass);
+ dx = SkScalarToFixed(fDstToIndex.getScaleX());
+ }
+
+ if (SkFixedNearlyZero(dx)) {
+ // we're a vertical gradient, so no change in a span
+- unsigned fi = proc(fx) >> (16 - kCache32Bits);
+- sk_memset32_dither(dstC, cache[toggle + fi],
+- cache[(toggle ^ TOGGLE_MASK) + fi], count);
++ if (proc == clamp_tileproc) {
++ if (fx < 0) {
++ sk_memset32(dstC, cache[-1], count);
++ } else if (fx > 0xFFFF) {
++ sk_memset32(dstC, cache[kCache32Count * 2], count);
++ } else {
++ unsigned fi = proc(fx) >> (16 - kCache32Bits);
++ sk_memset32_dither(dstC, cache[toggle + fi],
++ cache[(toggle ^ TOGGLE_MASK) + fi], count);
++ }
++ } else {
++ unsigned fi = proc(fx) >> (16 - kCache32Bits);
++ sk_memset32_dither(dstC, cache[toggle + fi],
++ cache[(toggle ^ TOGGLE_MASK) + fi], count);
++ }
+ } else if (proc == clamp_tileproc) {
+ SkClampRange range;
+- range.init(fx, dx, count, 0, 0xFF);
++ range.init(fx, dx, count, cache[-1], cache[kCache32Count * 2]);
+
+ if ((count = range.fCount0) > 0) {
+- sk_memset32_dither(dstC,
+- cache[toggle + range.fV0],
+- cache[(toggle ^ TOGGLE_MASK) + range.fV0],
+- count);
++ // Do we really want to dither the clamp values?
++ sk_memset32(dstC, range.fV0, count);
+ dstC += count;
+ }
+ if ((count = range.fCount1) > 0) {
+ int unroll = count >> 3;
+ fx = range.fFx1;
+ for (int i = 0; i < unroll; i++) {
+ NO_CHECK_ITER; NO_CHECK_ITER;
+ NO_CHECK_ITER; NO_CHECK_ITER;
+@@ -905,20 +934,17 @@ void Linear_Gradient::shadeSpan(int x, i
+ }
+ if ((count &= 7) > 0) {
+ do {
+ NO_CHECK_ITER;
+ } while (--count != 0);
+ }
+ }
+ if ((count = range.fCount2) > 0) {
+- sk_memset32_dither(dstC,
+- cache[toggle + range.fV1],
+- cache[(toggle ^ TOGGLE_MASK) + range.fV1],
+- count);
++ sk_memset32(dstC, range.fV1, count);
+ }
+ } else if (proc == mirror_tileproc) {
+ do {
+ unsigned fi = mirror_8bits(fx >> 8);
+ SkASSERT(fi <= 0xFF);
+ fx += dx;
+ *dstC++ = cache[toggle + fi];
+ toggle ^= TOGGLE_MASK;
+@@ -1670,19 +1699,24 @@ public:
+ }
+ SkScalar b = (SkScalarMul(fDiff.fX, fx) +
+ SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2;
+ SkScalar db = (SkScalarMul(fDiff.fX, dx) +
+ SkScalarMul(fDiff.fY, dy)) * 2;
+ if (proc == clamp_tileproc) {
+ 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 >> (16 - kCache32Bits)];
++ if (t < 0) {
++ *dstC++ = cache[-1];
++ } else if (t > 0xFFFF) {
++ *dstC++ = cache[kCache32Count * 2];
++ } else {
++ SkASSERT(t <= 0xFFFF);
++ *dstC++ = cache[t >> (16 - kCache32Bits)];
++ }
+ fx += dx;
+ fy += dy;
+ b += db;
+ }
+ } else if (proc == mirror_tileproc) {
+ for (; count > 0; --count) {
+ SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot);
+ SkFixed index = mirror_tileproc(t);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 03:02:10 +0000