diff options
Diffstat (limited to 'gfx/skia/patches/archive/0016-Bug-718849-Radial-gradients.patch')
| -rw-r--r-- | gfx/skia/patches/archive/0016-Bug-718849-Radial-gradients.patch | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/gfx/skia/patches/archive/0016-Bug-718849-Radial-gradients.patch b/gfx/skia/patches/archive/0016-Bug-718849-Radial-gradients.patch new file mode 100644 index 000000000..e00fd8602 --- /dev/null +++ b/gfx/skia/patches/archive/0016-Bug-718849-Radial-gradients.patch @@ -0,0 +1,400 @@ +# HG changeset patch +# User Matt Woodrow <mwoodrow@mozilla.com> +# Date 1339988782 -43200 +# Node ID 1e9dae659ee6c992f719fd4136efbcc5410ded37 +# Parent 946750f6d95febd199fb7b748e9d2c48fd01c8a6 +[mq]: skia-windows-gradients + +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 +@@ -847,16 +847,19 @@ bool Linear_Gradient::setContext(const S + fFlags |= SkShader::kConstInY32_Flag; + if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { + // only claim this if we do have a 16bit mode (i.e. none of our + // colors have alpha), and if we are not dithering (which obviously + // is not const in Y). + fFlags |= SkShader::kConstInY16_Flag; + } + } ++ if (fStart == fEnd) { ++ fFlags &= ~kOpaqueAlpha_Flag; ++ } + return true; + } + + #define NO_CHECK_ITER \ + do { \ + unsigned fi = fx >> Gradient_Shader::kCache32Shift; \ + SkASSERT(fi <= 0xFF); \ + fx += dx; \ +@@ -976,16 +979,21 @@ void Linear_Gradient::shadeSpan(int x, i + TileProc proc = fTileProc; + const SkPMColor* SK_RESTRICT cache = this->getCache32(); + #ifdef USE_DITHER_32BIT_GRADIENT + int toggle = ((x ^ y) & 1) * kDitherStride32; + #else + int toggle = 0; + #endif + ++ if (fStart == fEnd) { ++ sk_bzero(dstC, count * sizeof(*dstC)); ++ return; ++ } ++ + if (fDstToIndexClass != kPerspective_MatrixClass) { + dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, + SkIntToScalar(y) + SK_ScalarHalf, &srcPt); + SkFixed dx, fx = SkScalarToFixed(srcPt.fX); + + if (fDstToIndexClass == kFixedStepInX_MatrixClass) { + SkFixed dxStorage[1]; + (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); +@@ -1169,16 +1177,21 @@ void Linear_Gradient::shadeSpan16(int x, + SkASSERT(count > 0); + + SkPoint srcPt; + SkMatrix::MapXYProc dstProc = fDstToIndexProc; + TileProc proc = fTileProc; + const uint16_t* SK_RESTRICT cache = this->getCache16(); + int toggle = ((x ^ y) & 1) * kDitherStride16; + ++ if (fStart == fEnd) { ++ sk_bzero(dstC, count * sizeof(*dstC)); ++ return; ++ } ++ + if (fDstToIndexClass != kPerspective_MatrixClass) { + dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, + SkIntToScalar(y) + SK_ScalarHalf, &srcPt); + SkFixed dx, fx = SkScalarToFixed(srcPt.fX); + + if (fDstToIndexClass == kFixedStepInX_MatrixClass) { + SkFixed dxStorage[1]; + (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); +@@ -1739,21 +1752,25 @@ void Radial_Gradient::shadeSpan(int x, i + possible circles on which the point may fall. Solving for t yields + the gradient value to use. + + If a<0, the start circle is entirely contained in the + end circle, and one of the roots will be <0 or >1 (off the line + segment). If a>0, the start circle falls at least partially + outside the end circle (or vice versa), and the gradient + defines a "tube" where a point may be on one circle (on the +- inside of the tube) or the other (outside of the tube). We choose +- one arbitrarily. ++ inside of the tube) or the other (outside of the tube). We choose ++ the one with the highest t value, as long as the radius that it ++ corresponds to is >=0. In the case where neither root has a positive ++ radius, we don't draw anything. + ++ XXXmattwoodrow: I've removed this for now since it breaks ++ down when Dr == 0. Is there something else we can do instead? + In order to keep the math to within the limits of fixed point, +- we divide the entire quadratic by Dr^2, and replace ++ we divide the entire quadratic by Dr, and replace + (x - Sx)/Dr with x' and (y - Sy)/Dr with y', giving + + [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2 + + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t + + [x'^2 + y'^2 - Sr^2/Dr^2] = 0 + + (x' and y' are computed by appending the subtract and scale to the + fDstToIndex matrix in the constructor). +@@ -1763,99 +1780,122 @@ void Radial_Gradient::shadeSpan(int x, i + x' and y', if x and y are linear in the span, 'B' can be computed + incrementally with a simple delta (db below). If it is not (e.g., + a perspective projection), it must be computed in the loop. + + */ + + namespace { + +-inline SkFixed two_point_radial(SkScalar b, SkScalar fx, SkScalar fy, +- SkScalar sr2d2, SkScalar foura, +- SkScalar oneOverTwoA, bool posRoot) { ++inline bool two_point_radial(SkScalar b, SkScalar fx, SkScalar fy, ++ SkScalar sr2d2, SkScalar foura, ++ SkScalar oneOverTwoA, SkScalar diffRadius, ++ SkScalar startRadius, SkFixed& t) { + SkScalar c = SkScalarSquare(fx) + SkScalarSquare(fy) - sr2d2; + if (0 == foura) { +- return SkScalarToFixed(SkScalarDiv(-c, b)); ++ SkScalar result = SkScalarDiv(-c, b); ++ if (result * diffRadius + startRadius >= 0) { ++ t = SkScalarToFixed(result); ++ return true; ++ } ++ return false; + } + + SkScalar discrim = SkScalarSquare(b) - SkScalarMul(foura, c); + if (discrim < 0) { +- discrim = -discrim; ++ return false; + } + SkScalar rootDiscrim = SkScalarSqrt(discrim); +- SkScalar result; +- if (posRoot) { +- result = SkScalarMul(-b + rootDiscrim, oneOverTwoA); +- } else { +- result = SkScalarMul(-b - rootDiscrim, oneOverTwoA); ++ ++ // Make sure the results corresponds to a positive radius. ++ SkScalar result = SkScalarMul(-b + rootDiscrim, oneOverTwoA); ++ if (result * diffRadius + startRadius >= 0) { ++ t = SkScalarToFixed(result); ++ return true; + } +- return SkScalarToFixed(result); ++ result = SkScalarMul(-b - rootDiscrim, oneOverTwoA); ++ if (result * diffRadius + startRadius >= 0) { ++ t = SkScalarToFixed(result); ++ return true; ++ } ++ ++ return false; + } + + typedef void (* TwoPointRadialShadeProc)(SkScalar fx, SkScalar dx, + SkScalar fy, SkScalar dy, + SkScalar b, SkScalar db, +- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot, ++ SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, ++ SkScalar fDiffRadius, SkScalar fRadius1, + SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache, + int count); + + void shadeSpan_twopoint_clamp(SkScalar fx, SkScalar dx, + SkScalar fy, SkScalar dy, + SkScalar b, SkScalar db, +- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot, ++ SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, ++ SkScalar fDiffRadius, SkScalar fRadius1, + SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache, + int count) { + for (; count > 0; --count) { +- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, +- fOneOverTwoA, posRoot); +- +- if (t < 0) { ++ SkFixed t; ++ if (!two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, fDiffRadius, fRadius1, t)) { ++ *(dstC++) = 0; ++ } else 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; + } + } + void shadeSpan_twopoint_mirror(SkScalar fx, SkScalar dx, + SkScalar fy, SkScalar dy, + SkScalar b, SkScalar db, +- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot, ++ SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, ++ SkScalar fDiffRadius, SkScalar fRadius1, + SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache, + int count) { + for (; count > 0; --count) { +- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, +- fOneOverTwoA, posRoot); +- SkFixed index = mirror_tileproc(t); +- SkASSERT(index <= 0xFFFF); +- *dstC++ = cache[index >> Gradient_Shader::kCache32Shift]; ++ SkFixed t; ++ if (!two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, fDiffRadius, fRadius1, t)) { ++ *(dstC++) = 0; ++ } else { ++ SkFixed index = mirror_tileproc(t); ++ SkASSERT(index <= 0xFFFF); ++ *dstC++ = cache[index >> (16 - Gradient_Shader::kCache32Shift)]; ++ } + fx += dx; + fy += dy; + b += db; + } + } + + void shadeSpan_twopoint_repeat(SkScalar fx, SkScalar dx, + SkScalar fy, SkScalar dy, + SkScalar b, SkScalar db, +- SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, bool posRoot, ++ SkScalar fSr2D2, SkScalar foura, SkScalar fOneOverTwoA, ++ SkScalar fDiffRadius, SkScalar fRadius1, + SkPMColor* SK_RESTRICT dstC, const SkPMColor* SK_RESTRICT cache, + int count) { + for (; count > 0; --count) { +- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, +- fOneOverTwoA, posRoot); +- SkFixed index = repeat_tileproc(t); +- SkASSERT(index <= 0xFFFF); +- *dstC++ = cache[index >> Gradient_Shader::kCache32Shift]; ++ SkFixed t; ++ if (!two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, fDiffRadius, fRadius1, t)) { ++ *(dstC++) = 0; ++ } else { ++ SkFixed index = repeat_tileproc(t); ++ SkASSERT(index <= 0xFFFF); ++ *dstC++ = cache[index >> (16 - Gradient_Shader::kCache32Shift)]; ++ } + fx += dx; + fy += dy; + b += db; + } + } + + + +@@ -1935,17 +1975,16 @@ public: + sk_bzero(dstC, count * sizeof(*dstC)); + return; + } + SkMatrix::MapXYProc dstProc = fDstToIndexProc; + TileProc proc = fTileProc; + const SkPMColor* SK_RESTRICT cache = this->getCache32(); + + SkScalar foura = fA * 4; +- bool posRoot = fDiffRadius < 0; + if (fDstToIndexClass != kPerspective_MatrixClass) { + SkPoint srcPt; + dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, + SkIntToScalar(y) + SK_ScalarHalf, &srcPt); + SkScalar dx, fx = srcPt.fX; + SkScalar dy, fy = srcPt.fY; + + if (fDstToIndexClass == kFixedStepInX_MatrixClass) { +@@ -1954,60 +1993,69 @@ public: + dx = SkFixedToScalar(fixedX); + dy = SkFixedToScalar(fixedY); + } else { + SkASSERT(fDstToIndexClass == kLinear_MatrixClass); + dx = fDstToIndex.getScaleX(); + dy = fDstToIndex.getSkewY(); + } + SkScalar b = (SkScalarMul(fDiff.fX, fx) + +- SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; ++ SkScalarMul(fDiff.fY, fy) - fStartRadius * fDiffRadius) * 2; + SkScalar db = (SkScalarMul(fDiff.fX, dx) + + SkScalarMul(fDiff.fY, dy)) * 2; + + TwoPointRadialShadeProc shadeProc = shadeSpan_twopoint_repeat; + if (proc == clamp_tileproc) { + shadeProc = shadeSpan_twopoint_clamp; + } else if (proc == mirror_tileproc) { + shadeProc = shadeSpan_twopoint_mirror; + } else { + SkASSERT(proc == repeat_tileproc); + } + (*shadeProc)(fx, dx, fy, dy, b, db, +- fSr2D2, foura, fOneOverTwoA, posRoot, ++ fSr2D2, foura, fOneOverTwoA, fDiffRadius, fRadius1, + dstC, cache, count); + } else { // perspective case + SkScalar dstX = SkIntToScalar(x); + SkScalar dstY = SkIntToScalar(y); + for (; count > 0; --count) { + SkPoint srcPt; + dstProc(fDstToIndex, dstX, dstY, &srcPt); + SkScalar fx = srcPt.fX; + SkScalar fy = srcPt.fY; + SkScalar b = (SkScalarMul(fDiff.fX, fx) + + SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; +- SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, +- fOneOverTwoA, posRoot); +- SkFixed index = proc(t); +- SkASSERT(index <= 0xFFFF); +- *dstC++ = cache[index >> Gradient_Shader::kCache32Shift]; ++ SkFixed t; ++ if (!two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, fDiffRadius, fRadius1, t)) { ++ *(dstC++) = 0; ++ } else { ++ SkFixed index = proc(t); ++ SkASSERT(index <= 0xFFFF); ++ *dstC++ = cache[index >> (16 - kCache32Bits)]; ++ } + dstX += SK_Scalar1; + } + } + } + + virtual bool setContext(const SkBitmap& device, + const SkPaint& paint, + const SkMatrix& matrix) SK_OVERRIDE { + if (!this->INHERITED::setContext(device, paint, matrix)) { + return false; + } + + // we don't have a span16 proc + fFlags &= ~kHasSpan16_Flag; ++ ++ // If we might end up wanting to draw nothing as part of the gradient ++ // then we should mark ourselves as not being opaque. ++ if (fA >= 0 || (fDiffRadius == 0 && fCenter1 == fCenter2)) { ++ fFlags &= ~kOpaqueAlpha_Flag; ++ } + return true; + } + + SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Two_Point_Radial_Gradient) + + protected: + Two_Point_Radial_Gradient(SkFlattenableReadBuffer& buffer) + : INHERITED(buffer), +@@ -2033,26 +2081,22 @@ private: + const SkScalar fRadius1; + const SkScalar fRadius2; + SkPoint fDiff; + SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA; + + void init() { + fDiff = fCenter1 - fCenter2; + fDiffRadius = fRadius2 - fRadius1; +- SkScalar inv = SkScalarInvert(fDiffRadius); +- fDiff.fX = SkScalarMul(fDiff.fX, inv); +- fDiff.fY = SkScalarMul(fDiff.fY, inv); +- fStartRadius = SkScalarMul(fRadius1, inv); ++ fStartRadius = fRadius1; + fSr2D2 = SkScalarSquare(fStartRadius); +- fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1; ++ fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SkScalarSquare(fDiffRadius); + fOneOverTwoA = fA ? SkScalarInvert(fA * 2) : 0; + + fPtsToUnit.setTranslate(-fCenter1.fX, -fCenter1.fY); +- fPtsToUnit.postScale(inv, inv); + } + }; + + /////////////////////////////////////////////////////////////////////////////// + + class Sweep_Gradient : public Gradient_Shader { + public: + Sweep_Gradient(SkScalar cx, SkScalar cy, const SkColor colors[], +@@ -2488,16 +2532,20 @@ SkShader* SkGradientShader::CreateTwoPoi + int colorCount, + SkShader::TileMode mode, + SkUnitMapper* mapper) { + if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { + return NULL; + } + EXPAND_1_COLOR(colorCount); + ++ if (start == end && startRadius == 0) { ++ return CreateRadial(start, endRadius, colors, pos, colorCount, mode, mapper); ++ } ++ + return SkNEW_ARGS(Two_Point_Radial_Gradient, + (start, startRadius, end, endRadius, colors, pos, + colorCount, mode, mapper)); + } + + SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, + const SkColor colors[], + const SkScalar pos[], |