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gecko/gfx/skia/fix-gradient-clamp.patch

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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);
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