From 1ab13a923399aa638388231baca784ba89f2c82b Mon Sep 17 00:00:00 2001
From: George Wright <gw@gwright.org.uk>
Date: Wed, 12 Sep 2012 12:30:29 -0400
Subject: [PATCH 5/9] Bug 777614 - Re-apply bug 687188 - Expand the gradient
cache by 2 to store 0/1 colour stop values for
clamping. r=nrc
---
.../src/effects/gradients/SkGradientShader.cpp | 22 +++++++++++----
.../src/effects/gradients/SkGradientShaderPriv.h | 5 +++-
.../src/effects/gradients/SkLinearGradient.cpp | 32 ++++++++++++++++------
.../gradients/SkTwoPointConicalGradient.cpp | 11 ++++++--
.../effects/gradients/SkTwoPointRadialGradient.cpp | 11 ++++++--
5 files changed, 61 insertions(+), 20 deletions(-)
diff --git a/gfx/skia/src/effects/gradients/SkGradientShader.cpp b/gfx/skia/src/effects/gradients/SkGradientShader.cpp
index f0dac4d..79e7202 100644
--- a/gfx/skia/src/effects/gradients/SkGradientShader.cpp
+++ b/gfx/skia/src/effects/gradients/SkGradientShader.cpp
@@ -426,15 +426,15 @@ static void complete_32bit_cache(SkPMColor* cache, int stride) {
const SkPMColor* SkGradientShaderBase::getCache32() const {
if (fCache32 == NULL) {
- // double the count for dither entries
- const int entryCount = kCache32Count * 2;
+ // double the count for dither entries, and have an extra two entries for clamp values
+ 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);
@@ -458,7 +458,7 @@ 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 < kGradient32Length; i++) {
int index = map->mapUnit16((i << 8) | i) >> 8;
@@ -467,10 +467,22 @@ const SkPMColor* SkGradientShaderBase::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[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 0e7c2fc..7427935 100644
--- a/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h
+++ b/gfx/skia/src/effects/gradients/SkGradientShaderPriv.h
@@ -133,7 +133,10 @@ public:
kDitherStride32 = 0,
#endif
kDitherStride16 = kCache16Count,
- kLerpRemainderMask32 = (1 << (16 - kCache32Bits)) - 1
+ kLerpRemainderMask32 = (1 << (16 - kCache32Bits)) - 1,
+
+ kCache32ClampLower = -1,
+ kCache32ClampUpper = kCache32Count * 2
};
diff --git a/gfx/skia/src/effects/gradients/SkLinearGradient.cpp b/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
index bcebc26..d400b4d 100644
--- a/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
+++ b/gfx/skia/src/effects/gradients/SkLinearGradient.cpp
@@ -126,6 +126,17 @@ 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) {
+ // 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.
@@ -144,6 +155,17 @@ 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.
@@ -169,10 +191,7 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
range.init(fx, dx, count, 0, SkGradientShaderBase::kGradient32Length);
if ((count = range.fCount0) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV0],
- cache[(toggle ^ SkGradientShaderBase::kDitherStride32) + range.fV0],
- count);
+ sk_memset32(dstC, cache[SkGradientShaderBase::kCache32ClampLower], count);
dstC += count;
}
if ((count = range.fCount1) > 0) {
@@ -191,10 +210,7 @@ void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx,
}
}
if ((count = range.fCount2) > 0) {
- sk_memset32_dither(dstC,
- cache[toggle + range.fV1],
- cache[(toggle ^ SkGradientShaderBase::kDitherStride32) + 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 3466d2c..764a444 100644
--- a/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/gfx/skia/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -123,9 +123,14 @@ 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[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];
+ }
}
}
}
diff --git a/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp b/gfx/skia/src/effects/gradients/SkTwoPointRadialGradient.cpp
index 9362ded..22b028e 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;
--
1.7.11.4