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From: George Wright <gw@gwright.org.uk>
Date: Thu, 25 Apr 2013 20:47:06 -0400
Subject: Bug 848491 - Re-apply bug 687188 - Expand the gradient cache by 2 to store 0/1 colour stop values for clamping.
diff --git a/gfx/skia/src/effects/gradients/SkGradientShader.cpp b/gfx/skia/src/effects/gradients/SkGradientShader.cpp
index 684355d..27a9c46 100644
--- a/gfx/skia/src/effects/gradients/SkGradientShader.cpp
+++ b/gfx/skia/src/effects/gradients/SkGradientShader.cpp
@@ -453,15 +453,15 @@ const uint16_t* SkGradientShaderBase::getCache16() const {
const SkPMColor* SkGradientShaderBase::getCache32() const {
if (fCache32 == NULL) {
- // double the count for dither entries
- const int entryCount = kCache32Count * 4;
+ // double the count for dither entries, and have an extra two entries for clamp values
+ const int entryCount = kCache32Count * 4 + 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);
@@ -484,7 +484,7 @@ const SkPMColor* SkGradientShaderBase::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 < kCache32Count; i++) {
int index = map->mapUnit16((i << 8) | i) >> 8;
@@ -495,9 +495,21 @@ const SkPMColor* SkGradientShaderBase::getCache32() const {
}
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[kCache32ClampLower] = SkPackARGB32(fCacheAlpha,
+ SkColorGetR(fOrigColors[0]),
+ SkColorGetG(fOrigColors[0]),
+ SkColorGetB(fOrigColors[0]));
+
+ fCache32[kCache32ClampUpper] = SkPackARGB32(fCacheAlpha,
+ SkColorGetR(fOrigColors[fColorCount - 1]),
+ SkColorGetG(fOrigColors[fColorCount - 1]),
+ SkColorGetB(fOrigColors[fColorCount - 1]));
+
return fCache32;
}
diff --git a/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h b/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h
index 729ce4e..2cb6a9d 100644
--- a/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h
+++ b/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h
@@ -86,6 +86,9 @@ public:
/// if dithering is disabled.
kDitherStride32 = kCache32Count,
kDitherStride16 = kCache16Count,
+
+ kCache32ClampLower = -1,
+ kCache32ClampUpper = kCache32Count * 4
};
diff --git a/gfx/skia/src/effects/gradients/SkLinearGradient.cpp b/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
index e0f216c..40ab918 100644
--- a/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
+++ b/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
@@ -127,6 +127,17 @@ 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) {
+ // No need to lerp or dither for clamp values
+ if (fx < 0) {
+ sk_memset32(dstC, cache[SkGradientShaderBase::kCache32ClampLower], count);
+ return;
+ } else if (fx > 0xffff) {
+ sk_memset32(dstC, cache[SkGradientShaderBase::kCache32ClampUpper], 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.
@@ -154,10 +165,7 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
range.init(fx, dx, count, 0, SkGradientShaderBase::kCache32Count - 1);
if ((count = range.fCount0) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV0],
- cache[next_dither_toggle(toggle) + range.fV0],
- count);
+ sk_memset32(dstC, cache[SkGradientShaderBase::kCache32ClampLower], count);
dstC += count;
}
if ((count = range.fCount1) > 0) {
@@ -176,10 +184,7 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
}
}
if ((count = range.fCount2) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV1],
- cache[next_dither_toggle(toggle) + range.fV1],
- count);
+ sk_memset32(dstC, cache[SkGradientShaderBase::kCache32ClampUpper], count);
}
}
diff --git a/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp b/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp
index abd974b..601fff4 100644
--- a/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -124,10 +124,14 @@ static void twopoint_clamp(TwoPtRadial* rec, SkPMColor* SK_RESTRICT dstC,
if (TwoPtRadial::DontDrawT(t)) {
*dstC++ = 0;
} else {
- SkFixed index = SkClampMax(t, 0xFFFF);
- SkASSERT(index <= 0xFFFF);
- *dstC++ = cache[toggle +
- (index >> SkGradientShaderBase::kCache32Shift)];
+ if (t < 0) {
+ *dstC++ = cache[SkGradientShaderBase::kCache32ClampLower];
+ } else if (t > 0xFFFF) {
+ *dstC++ = cache[SkGradientShaderBase::kCache32ClampUpper];
+ } else {
+ SkASSERT(t <= 0xFFFF);
+ *dstC++ = cache[t >> SkGradientShaderBase::kCache32Shift];
+ }
}
toggle = next_dither_toggle(toggle);
}
diff --git a/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp b/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp
index f70b67d..ec2ae75 100644
--- a/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp
+++ b/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp
@@ -120,9 +120,14 @@ 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 >> SkGradientShaderBase::kCache32Shift];
+ if (t < 0) {
+ *dstC++ = cache[SkGradientShaderBase::kCache32ClampLower];
+ } else if (t > 0xFFFF) {
+ *dstC++ = cache[SkGradientShaderBase::kCache32ClampUpper];
+ } else {
+ SkASSERT(t <= 0xFFFF);
+ *dstC++ = cache[t >> SkGradientShaderBase::kCache32Shift];
+ }
fx += dx;
fy += dy;
b += db;
--
1.7.11.7