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Diffstat (limited to 'chromium/third_party/skia/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp')
| -rw-r--r-- | chromium/third_party/skia/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/chromium/third_party/skia/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp b/chromium/third_party/skia/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp new file mode 100644 index 00000000000..4f9f7584678 --- /dev/null +++ b/chromium/third_party/skia/src/effects/gradients/SkTwoPointConicalGradient_gpu.cpp @@ -0,0 +1,1330 @@ + +/* + * Copyright 2014 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "SkTwoPointConicalGradient_gpu.h" + +#include "SkTwoPointConicalGradient.h" + +#if SK_SUPPORT_GPU +#include "GrTBackendEffectFactory.h" +// For brevity +typedef GrGLUniformManager::UniformHandle UniformHandle; + +static const SkScalar kErrorTol = 0.00001f; +static const SkScalar kEdgeErrorTol = 5.f * kErrorTol; + +/** + * We have three general cases for 2pt conical gradients. First we always assume that + * the start radius <= end radius. Our first case (kInside_) is when the start circle + * is completely enclosed by the end circle. The second case (kOutside_) is the case + * when the start circle is either completely outside the end circle or the circles + * overlap. The final case (kEdge_) is when the start circle is inside the end one, + * but the two are just barely touching at 1 point along their edges. + */ +enum ConicalType { + kInside_ConicalType, + kOutside_ConicalType, + kEdge_ConicalType, +}; + +////////////////////////////////////////////////////////////////////////////// + +static void set_matrix_edge_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix) { + // Inverse of the current local matrix is passed in then, + // translate to center1, rotate so center2 is on x axis. + const SkPoint& center1 = shader.getStartCenter(); + const SkPoint& center2 = shader.getEndCenter(); + + invLMatrix->postTranslate(-center1.fX, -center1.fY); + + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + if (0 != diffLen) { + SkScalar invDiffLen = SkScalarInvert(diffLen); + SkMatrix rot; + rot.setSinCos(-SkScalarMul(invDiffLen, diff.fY), + SkScalarMul(invDiffLen, diff.fX)); + invLMatrix->postConcat(rot); + } +} + +class GLEdge2PtConicalEffect; + +class Edge2PtConicalEffect : public GrGradientEffect { +public: + + static GrEffectRef* Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm) { + AutoEffectUnref effect(SkNEW_ARGS(Edge2PtConicalEffect, (ctx, shader, matrix, tm))); + return CreateEffectRef(effect); + } + + virtual ~Edge2PtConicalEffect() {} + + static const char* Name() { return "Two-Point Conical Gradient Edge Touching"; } + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; + + // The radial gradient parameters can collapse to a linear (instead of quadratic) equation. + SkScalar center() const { return fCenterX1; } + SkScalar diffRadius() const { return fDiffRadius; } + SkScalar radius() const { return fRadius0; } + + typedef GLEdge2PtConicalEffect GLEffect; + +private: + virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { + const Edge2PtConicalEffect& s = CastEffect<Edge2PtConicalEffect>(sBase); + return (INHERITED::onIsEqual(sBase) && + this->fCenterX1 == s.fCenterX1 && + this->fRadius0 == s.fRadius0 && + this->fDiffRadius == s.fDiffRadius); + } + + Edge2PtConicalEffect(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm) + : INHERITED(ctx, shader, matrix, tm), + fCenterX1(shader.getCenterX1()), + fRadius0(shader.getStartRadius()), + fDiffRadius(shader.getDiffRadius()){ + // We should only be calling this shader if we are degenerate case with touching circles + // When deciding if we are in edge case, we scaled by the end radius for cases when the + // start radius was close to zero, otherwise we scaled by the start radius + SkASSERT(SkScalarAbs(SkScalarAbs(fDiffRadius) - SkScalarAbs(fCenterX1)) < + kEdgeErrorTol * (fRadius0 < kErrorTol ? shader.getEndRadius() : fRadius0)); + + // We pass the linear part of the quadratic as a varying. + // float b = -2.0 * (fCenterX1 * x + fRadius0 * fDiffRadius * z) + fBTransform = this->getCoordTransform(); + SkMatrix& bMatrix = *fBTransform.accessMatrix(); + SkScalar r0dr = SkScalarMul(fRadius0, fDiffRadius); + bMatrix[SkMatrix::kMScaleX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMScaleX]) + + SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp0])); + bMatrix[SkMatrix::kMSkewX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMSkewX]) + + SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp1])); + bMatrix[SkMatrix::kMTransX] = -2 * (SkScalarMul(fCenterX1, bMatrix[SkMatrix::kMTransX]) + + SkScalarMul(r0dr, bMatrix[SkMatrix::kMPersp2])); + this->addCoordTransform(&fBTransform); + } + + GR_DECLARE_EFFECT_TEST; + + // @{ + // Cache of values - these can change arbitrarily, EXCEPT + // we shouldn't change between degenerate and non-degenerate?! + + GrCoordTransform fBTransform; + SkScalar fCenterX1; + SkScalar fRadius0; + SkScalar fDiffRadius; + + // @} + + typedef GrGradientEffect INHERITED; +}; + +class GLEdge2PtConicalEffect : public GrGLGradientEffect { +public: + GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); + virtual ~GLEdge2PtConicalEffect() { } + + virtual void emitCode(GrGLShaderBuilder*, + const GrDrawEffect&, + EffectKey, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray&, + const TextureSamplerArray&) SK_OVERRIDE; + virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; + + static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); + +protected: + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedRadius; + SkScalar fCachedDiffRadius; + + // @} + +private: + typedef GrGLGradientEffect INHERITED; + +}; + +const GrBackendEffectFactory& Edge2PtConicalEffect::getFactory() const { + return GrTBackendEffectFactory<Edge2PtConicalEffect>::getInstance(); +} + +GR_DEFINE_EFFECT_TEST(Edge2PtConicalEffect); + +GrEffectRef* Edge2PtConicalEffect::TestCreate(SkRandom* random, + GrContext* context, + const GrDrawTargetCaps&, + GrTexture**) { + SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; + SkScalar radius1 = random->nextUScalar1(); + SkPoint center2; + SkScalar radius2; + do { + center2.set(random->nextUScalar1(), random->nextUScalar1()); + // If the circles are identical the factory will give us an empty shader. + // This will happen if we pick identical centers + } while (center1 == center2); + + // Below makes sure that circle one is contained within circle two + // and both circles are touching on an edge + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = radius1 + diffLen; + + SkColor colors[kMaxRandomGradientColors]; + SkScalar stopsArray[kMaxRandomGradientColors]; + SkScalar* stops = stopsArray; + SkShader::TileMode tm; + int colorCount = RandomGradientParams(random, colors, &stops, &tm); + SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, + center2, radius2, + colors, stops, colorCount, + tm)); + SkPaint paint; + GrEffectRef* effect; + GrColor grColor; + shader->asNewEffect(context, paint, NULL, &grColor, &effect); + return effect; +} + +GLEdge2PtConicalEffect::GLEdge2PtConicalEffect(const GrBackendEffectFactory& factory, + const GrDrawEffect& drawEffect) + : INHERITED(factory) + , fVSVaryingName(NULL) + , fFSVaryingName(NULL) + , fCachedRadius(-SK_ScalarMax) + , fCachedDiffRadius(-SK_ScalarMax) {} + +void GLEdge2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect&, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) { + this->emitUniforms(builder, key); + fParamUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility, + kFloat_GrSLType, "Conical2FSParams", 3); + + SkString cName("c"); + SkString tName("t"); + SkString p0; // start radius + SkString p1; // start radius squared + SkString p2; // difference in radii (r1 - r0) + + builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); + builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); + builder->getUniformVariable(fParamUni).appendArrayAccess(2, &p2); + + // We interpolate the linear component in coords[1]. + SkASSERT(coords[0].type() == coords[1].type()); + const char* coords2D; + SkString bVar; + if (kVec3f_GrSLType == coords[0].type()) { + builder->fsCodeAppendf("\tvec3 interpolants = vec3(%s.xy / %s.z, %s.x / %s.z);\n", + coords[0].c_str(), coords[0].c_str(), coords[1].c_str(), coords[1].c_str()); + coords2D = "interpolants.xy"; + bVar = "interpolants.z"; + } else { + coords2D = coords[0].c_str(); + bVar.printf("%s.x", coords[1].c_str()); + } + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); + + // c = (x^2)+(y^2) - params[1] + builder->fsCodeAppendf("\tfloat %s = dot(%s, %s) - %s;\n", + cName.c_str(), coords2D, coords2D, p1.c_str()); + + // linear case: t = -c/b + builder->fsCodeAppendf("\tfloat %s = -(%s / %s);\n", tName.c_str(), + cName.c_str(), bVar.c_str()); + + // if r(t) > 0, then t will be the x coordinate + builder->fsCodeAppendf("\tif (%s * %s + %s > 0.0) {\n", tName.c_str(), + p2.c_str(), p0.c_str()); + builder->fsCodeAppend("\t"); + this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); + builder->fsCodeAppend("\t}\n"); +} + +void GLEdge2PtConicalEffect::setData(const GrGLUniformManager& uman, + const GrDrawEffect& drawEffect) { + INHERITED::setData(uman, drawEffect); + const Edge2PtConicalEffect& data = drawEffect.castEffect<Edge2PtConicalEffect>(); + SkScalar radius0 = data.radius(); + SkScalar diffRadius = data.diffRadius(); + + if (fCachedRadius != radius0 || + fCachedDiffRadius != diffRadius) { + + float values[3] = { + SkScalarToFloat(radius0), + SkScalarToFloat(SkScalarMul(radius0, radius0)), + SkScalarToFloat(diffRadius) + }; + + uman.set1fv(fParamUni, 3, values); + fCachedRadius = radius0; + fCachedDiffRadius = diffRadius; + } +} + +GrGLEffect::EffectKey GLEdge2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, + const GrGLCaps&) { + return GenBaseGradientKey(drawEffect); +} + +////////////////////////////////////////////////////////////////////////////// +// Focal Conical Gradients +////////////////////////////////////////////////////////////////////////////// + +static ConicalType set_matrix_focal_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix, SkScalar* focalX) { + // Inverse of the current local matrix is passed in then, + // translate, scale, and rotate such that endCircle is unit circle on x-axis, + // and focal point is at the origin. + ConicalType conicalType; + const SkPoint& focal = shader.getStartCenter(); + const SkPoint& centerEnd = shader.getEndCenter(); + SkScalar radius = shader.getEndRadius(); + SkScalar invRadius = 1.f / radius; + + SkMatrix matrix; + + matrix.setTranslate(-centerEnd.fX, -centerEnd.fY); + matrix.postScale(invRadius, invRadius); + + SkPoint focalTrans; + matrix.mapPoints(&focalTrans, &focal, 1); + *focalX = focalTrans.length(); + + if (0.f != *focalX) { + SkScalar invFocalX = SkScalarInvert(*focalX); + SkMatrix rot; + rot.setSinCos(-SkScalarMul(invFocalX, focalTrans.fY), + SkScalarMul(invFocalX, focalTrans.fX)); + matrix.postConcat(rot); + } + + matrix.postTranslate(-(*focalX), 0.f); + + // If the focal point is touching the edge of the circle it will + // cause a degenerate case that must be handled separately + // kEdgeErrorTol = 5 * kErrorTol was picked after manual testing the + // stability trade off versus the linear approx used in the Edge Shader + if (SkScalarAbs(1.f - (*focalX)) < kEdgeErrorTol) { + return kEdge_ConicalType; + } + + // Scale factor 1 / (1 - focalX * focalX) + SkScalar oneMinusF2 = 1.f - SkScalarMul(*focalX, *focalX); + SkScalar s = SkScalarDiv(1.f, oneMinusF2); + + + if (s >= 0.f) { + conicalType = kInside_ConicalType; + matrix.postScale(s, s * SkScalarSqrt(oneMinusF2)); + } else { + conicalType = kOutside_ConicalType; + matrix.postScale(s, s); + } + + invLMatrix->postConcat(matrix); + + return conicalType; +} + +////////////////////////////////////////////////////////////////////////////// + +class GLFocalOutside2PtConicalEffect; + +class FocalOutside2PtConicalEffect : public GrGradientEffect { +public: + + static GrEffectRef* Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + SkScalar focalX) { + AutoEffectUnref effect(SkNEW_ARGS(FocalOutside2PtConicalEffect, (ctx, shader, matrix, tm, focalX))); + return CreateEffectRef(effect); + } + + virtual ~FocalOutside2PtConicalEffect() { } + + static const char* Name() { return "Two-Point Conical Gradient Focal Outside"; } + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; + + bool isFlipped() const { return fIsFlipped; } + SkScalar focal() const { return fFocalX; } + + typedef GLFocalOutside2PtConicalEffect GLEffect; + +private: + virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { + const FocalOutside2PtConicalEffect& s = CastEffect<FocalOutside2PtConicalEffect>(sBase); + return (INHERITED::onIsEqual(sBase) && + this->fFocalX == s.fFocalX && + this->fIsFlipped == s.fIsFlipped); + } + + FocalOutside2PtConicalEffect(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + SkScalar focalX) + : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX), fIsFlipped(shader.isFlippedGrad()) {} + + GR_DECLARE_EFFECT_TEST; + + SkScalar fFocalX; + bool fIsFlipped; + + typedef GrGradientEffect INHERITED; +}; + +class GLFocalOutside2PtConicalEffect : public GrGLGradientEffect { +public: + GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); + virtual ~GLFocalOutside2PtConicalEffect() { } + + virtual void emitCode(GrGLShaderBuilder*, + const GrDrawEffect&, + EffectKey, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray&, + const TextureSamplerArray&) SK_OVERRIDE; + virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; + + static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); + +protected: + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + bool fIsFlipped; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedFocal; + + // @} + +private: + typedef GrGLGradientEffect INHERITED; + +}; + +const GrBackendEffectFactory& FocalOutside2PtConicalEffect::getFactory() const { + return GrTBackendEffectFactory<FocalOutside2PtConicalEffect>::getInstance(); +} + +GR_DEFINE_EFFECT_TEST(FocalOutside2PtConicalEffect); + +GrEffectRef* FocalOutside2PtConicalEffect::TestCreate(SkRandom* random, + GrContext* context, + const GrDrawTargetCaps&, + GrTexture**) { + SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; + SkScalar radius1 = 0.f; + SkPoint center2; + SkScalar radius2; + do { + center2.set(random->nextUScalar1(), random->nextUScalar1()); + // Need to make sure the centers are not the same or else focal point will be inside + } while (center1 == center2); + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + // Below makes sure that the focal point is not contained within circle two + radius2 = random->nextRangeF(0.f, diffLen); + + SkColor colors[kMaxRandomGradientColors]; + SkScalar stopsArray[kMaxRandomGradientColors]; + SkScalar* stops = stopsArray; + SkShader::TileMode tm; + int colorCount = RandomGradientParams(random, colors, &stops, &tm); + SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, + center2, radius2, + colors, stops, colorCount, + tm)); + SkPaint paint; + GrEffectRef* effect; + GrColor grColor; + shader->asNewEffect(context, paint, NULL, &grColor, &effect); + return effect; +} + +GLFocalOutside2PtConicalEffect::GLFocalOutside2PtConicalEffect(const GrBackendEffectFactory& factory, + const GrDrawEffect& drawEffect) + : INHERITED(factory) + , fVSVaryingName(NULL) + , fFSVaryingName(NULL) + , fCachedFocal(SK_ScalarMax) { + const FocalOutside2PtConicalEffect& data = drawEffect.castEffect<FocalOutside2PtConicalEffect>(); + fIsFlipped = data.isFlipped(); +} + +void GLFocalOutside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect&, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) { + this->emitUniforms(builder, key); + fParamUni = builder->addUniformArray(GrGLShaderBuilder::kFragment_Visibility, + kFloat_GrSLType, "Conical2FSParams", 2); + SkString tName("t"); + SkString p0; // focalX + SkString p1; // 1 - focalX * focalX + + builder->getUniformVariable(fParamUni).appendArrayAccess(0, &p0); + builder->getUniformVariable(fParamUni).appendArrayAccess(1, &p1); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + SkString coords2DString = builder->ensureFSCoords2D(coords, 0); + const char* coords2D = coords2DString.c_str(); + + // t = p.x * focal.x +/- sqrt(p.x^2 + (1 - focal.x^2) * p.y^2) + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); + + builder->fsCodeAppendf("\tfloat xs = %s.x * %s.x;\n", coords2D, coords2D); + builder->fsCodeAppendf("\tfloat ys = %s.y * %s.y;\n", coords2D, coords2D); + builder->fsCodeAppendf("\tfloat d = xs + %s * ys;\n", p1.c_str()); + + // Must check to see if we flipped the circle order (to make sure start radius < end radius) + // If so we must also flip sign on sqrt + if (!fIsFlipped) { + builder->fsCodeAppendf("\tfloat %s = %s.x * %s + sqrt(d);\n", tName.c_str(), + coords2D, p0.c_str()); + } else { + builder->fsCodeAppendf("\tfloat %s = %s.x * %s - sqrt(d);\n", tName.c_str(), + coords2D, p0.c_str()); + } + + builder->fsCodeAppendf("\tif (%s >= 0.0 && d >= 0.0) {\n", tName.c_str()); + builder->fsCodeAppend("\t\t"); + this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); + builder->fsCodeAppend("\t}\n"); +} + +void GLFocalOutside2PtConicalEffect::setData(const GrGLUniformManager& uman, + const GrDrawEffect& drawEffect) { + INHERITED::setData(uman, drawEffect); + const FocalOutside2PtConicalEffect& data = drawEffect.castEffect<FocalOutside2PtConicalEffect>(); + SkASSERT(data.isFlipped() == fIsFlipped); + SkScalar focal = data.focal(); + + if (fCachedFocal != focal) { + SkScalar oneMinus2F = 1.f - SkScalarMul(focal, focal); + + float values[2] = { + SkScalarToFloat(focal), + SkScalarToFloat(oneMinus2F), + }; + + uman.set1fv(fParamUni, 2, values); + fCachedFocal = focal; + } +} + +GrGLEffect::EffectKey GLFocalOutside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, + const GrGLCaps&) { + enum { + kIsFlipped = 1 << kBaseKeyBitCnt, + }; + + EffectKey key = GenBaseGradientKey(drawEffect); + + if (drawEffect.castEffect<FocalOutside2PtConicalEffect>().isFlipped()) { + key |= kIsFlipped; + } + return key; +} + +////////////////////////////////////////////////////////////////////////////// + +class GLFocalInside2PtConicalEffect; + +class FocalInside2PtConicalEffect : public GrGradientEffect { +public: + + static GrEffectRef* Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + SkScalar focalX) { + AutoEffectUnref effect(SkNEW_ARGS(FocalInside2PtConicalEffect, (ctx, shader, matrix, tm, focalX))); + return CreateEffectRef(effect); + } + + virtual ~FocalInside2PtConicalEffect() {} + + static const char* Name() { return "Two-Point Conical Gradient Focal Inside"; } + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; + + SkScalar focal() const { return fFocalX; } + + typedef GLFocalInside2PtConicalEffect GLEffect; + +private: + virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { + const FocalInside2PtConicalEffect& s = CastEffect<FocalInside2PtConicalEffect>(sBase); + return (INHERITED::onIsEqual(sBase) && + this->fFocalX == s.fFocalX); + } + + FocalInside2PtConicalEffect(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + SkScalar focalX) + : INHERITED(ctx, shader, matrix, tm), fFocalX(focalX) {} + + GR_DECLARE_EFFECT_TEST; + + SkScalar fFocalX; + + typedef GrGradientEffect INHERITED; +}; + +class GLFocalInside2PtConicalEffect : public GrGLGradientEffect { +public: + GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); + virtual ~GLFocalInside2PtConicalEffect() {} + + virtual void emitCode(GrGLShaderBuilder*, + const GrDrawEffect&, + EffectKey, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray&, + const TextureSamplerArray&) SK_OVERRIDE; + virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; + + static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); + +protected: + UniformHandle fFocalUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedFocal; + + // @} + +private: + typedef GrGLGradientEffect INHERITED; + +}; + +const GrBackendEffectFactory& FocalInside2PtConicalEffect::getFactory() const { + return GrTBackendEffectFactory<FocalInside2PtConicalEffect>::getInstance(); +} + +GR_DEFINE_EFFECT_TEST(FocalInside2PtConicalEffect); + +GrEffectRef* FocalInside2PtConicalEffect::TestCreate(SkRandom* random, + GrContext* context, + const GrDrawTargetCaps&, + GrTexture**) { + SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; + SkScalar radius1 = 0.f; + SkPoint center2; + SkScalar radius2; + do { + center2.set(random->nextUScalar1(), random->nextUScalar1()); + // Below makes sure radius2 is larger enouch such that the focal point + // is inside the end circle + SkScalar increase = random->nextUScalar1(); + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = diffLen + increase; + // If the circles are identical the factory will give us an empty shader. + } while (radius1 == radius2 && center1 == center2); + + SkColor colors[kMaxRandomGradientColors]; + SkScalar stopsArray[kMaxRandomGradientColors]; + SkScalar* stops = stopsArray; + SkShader::TileMode tm; + int colorCount = RandomGradientParams(random, colors, &stops, &tm); + SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, + center2, radius2, + colors, stops, colorCount, + tm)); + SkPaint paint; + GrColor grColor; + GrEffectRef* grEffect; + shader->asNewEffect(context, paint, NULL, &grColor, &grEffect); + return grEffect; +} + +GLFocalInside2PtConicalEffect::GLFocalInside2PtConicalEffect(const GrBackendEffectFactory& factory, + const GrDrawEffect& drawEffect) + : INHERITED(factory) + , fVSVaryingName(NULL) + , fFSVaryingName(NULL) + , fCachedFocal(SK_ScalarMax) {} + +void GLFocalInside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect&, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) { + this->emitUniforms(builder, key); + fFocalUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, + kFloat_GrSLType, "Conical2FSParams"); + SkString tName("t"); + + // this is the distance along x-axis from the end center to focal point in + // transformed coordinates + GrGLShaderVar focal = builder->getUniformVariable(fFocalUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + SkString coords2DString = builder->ensureFSCoords2D(coords, 0); + const char* coords2D = coords2DString.c_str(); + + // t = p.x * focalX + length(p) + builder->fsCodeAppendf("\tfloat %s = %s.x * %s + length(%s);\n", tName.c_str(), + coords2D, focal.c_str(), coords2D); + + this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); +} + +void GLFocalInside2PtConicalEffect::setData(const GrGLUniformManager& uman, + const GrDrawEffect& drawEffect) { + INHERITED::setData(uman, drawEffect); + const FocalInside2PtConicalEffect& data = drawEffect.castEffect<FocalInside2PtConicalEffect>(); + SkScalar focal = data.focal(); + + if (fCachedFocal != focal) { + uman.set1f(fFocalUni, SkScalarToFloat(focal)); + fCachedFocal = focal; + } +} + +GrGLEffect::EffectKey GLFocalInside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, + const GrGLCaps&) { + return GenBaseGradientKey(drawEffect); +} + +////////////////////////////////////////////////////////////////////////////// +// Circle Conical Gradients +////////////////////////////////////////////////////////////////////////////// + +struct CircleConicalInfo { + SkPoint fCenterEnd; + SkScalar fA; + SkScalar fB; + SkScalar fC; +}; + +// Returns focal distance along x-axis in transformed coords +static ConicalType set_matrix_circle_conical(const SkTwoPointConicalGradient& shader, + SkMatrix* invLMatrix, CircleConicalInfo* info) { + // Inverse of the current local matrix is passed in then, + // translate and scale such that start circle is on the origin and has radius 1 + const SkPoint& centerStart = shader.getStartCenter(); + const SkPoint& centerEnd = shader.getEndCenter(); + SkScalar radiusStart = shader.getStartRadius(); + SkScalar radiusEnd = shader.getEndRadius(); + + SkMatrix matrix; + + matrix.setTranslate(-centerStart.fX, -centerStart.fY); + + SkScalar invStartRad = 1.f / radiusStart; + matrix.postScale(invStartRad, invStartRad); + + radiusEnd /= radiusStart; + + SkPoint centerEndTrans; + matrix.mapPoints(¢erEndTrans, ¢erEnd, 1); + + SkScalar A = centerEndTrans.fX * centerEndTrans.fX + centerEndTrans.fY * centerEndTrans.fY + - radiusEnd * radiusEnd + 2 * radiusEnd - 1; + + // Check to see if start circle is inside end circle with edges touching. + // If touching we return that it is of kEdge_ConicalType, and leave the matrix setting + // to the edge shader. kEdgeErrorTol = 5 * kErrorTol was picked after manual testing + // so that C = 1 / A is stable, and the linear approximation used in the Edge shader is + // still accurate. + if (SkScalarAbs(A) < kEdgeErrorTol) { + return kEdge_ConicalType; + } + + SkScalar C = 1.f / A; + SkScalar B = (radiusEnd - 1.f) * C; + + matrix.postScale(C, C); + + invLMatrix->postConcat(matrix); + + info->fCenterEnd = centerEndTrans; + info->fA = A; + info->fB = B; + info->fC = C; + + // if A ends up being negative, the start circle is contained completely inside the end cirlce + if (A < 0.f) { + return kInside_ConicalType; + } + return kOutside_ConicalType; +} + +class GLCircleInside2PtConicalEffect; + +class CircleInside2PtConicalEffect : public GrGradientEffect { +public: + + static GrEffectRef* Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + const CircleConicalInfo& info) { + AutoEffectUnref effect(SkNEW_ARGS(CircleInside2PtConicalEffect, (ctx, shader, matrix, tm, info))); + return CreateEffectRef(effect); + } + + virtual ~CircleInside2PtConicalEffect() {} + + static const char* Name() { return "Two-Point Conical Gradient Inside"; } + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; + + SkScalar centerX() const { return fInfo.fCenterEnd.fX; } + SkScalar centerY() const { return fInfo.fCenterEnd.fY; } + SkScalar A() const { return fInfo.fA; } + SkScalar B() const { return fInfo.fB; } + SkScalar C() const { return fInfo.fC; } + + typedef GLCircleInside2PtConicalEffect GLEffect; + +private: + virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { + const CircleInside2PtConicalEffect& s = CastEffect<CircleInside2PtConicalEffect>(sBase); + return (INHERITED::onIsEqual(sBase) && + this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && + this->fInfo.fA == s.fInfo.fA && + this->fInfo.fB == s.fInfo.fB && + this->fInfo.fC == s.fInfo.fC); + } + + CircleInside2PtConicalEffect(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + const CircleConicalInfo& info) + : INHERITED(ctx, shader, matrix, tm), fInfo(info) {} + + GR_DECLARE_EFFECT_TEST; + + const CircleConicalInfo fInfo; + + typedef GrGradientEffect INHERITED; +}; + +class GLCircleInside2PtConicalEffect : public GrGLGradientEffect { +public: + GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); + virtual ~GLCircleInside2PtConicalEffect() {} + + virtual void emitCode(GrGLShaderBuilder*, + const GrDrawEffect&, + EffectKey, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray&, + const TextureSamplerArray&) SK_OVERRIDE; + virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; + + static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); + +protected: + UniformHandle fCenterUni; + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedCenterX; + SkScalar fCachedCenterY; + SkScalar fCachedA; + SkScalar fCachedB; + SkScalar fCachedC; + + // @} + +private: + typedef GrGLGradientEffect INHERITED; + +}; + +const GrBackendEffectFactory& CircleInside2PtConicalEffect::getFactory() const { + return GrTBackendEffectFactory<CircleInside2PtConicalEffect>::getInstance(); +} + +GR_DEFINE_EFFECT_TEST(CircleInside2PtConicalEffect); + +GrEffectRef* CircleInside2PtConicalEffect::TestCreate(SkRandom* random, + GrContext* context, + const GrDrawTargetCaps&, + GrTexture**) { + SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; + SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 + SkPoint center2; + SkScalar radius2; + do { + center2.set(random->nextUScalar1(), random->nextUScalar1()); + // Below makes sure that circle one is contained within circle two + SkScalar increase = random->nextUScalar1(); + SkPoint diff = center2 - center1; + SkScalar diffLen = diff.length(); + radius2 = radius1 + diffLen + increase; + // If the circles are identical the factory will give us an empty shader. + } while (radius1 == radius2 && center1 == center2); + + SkColor colors[kMaxRandomGradientColors]; + SkScalar stopsArray[kMaxRandomGradientColors]; + SkScalar* stops = stopsArray; + SkShader::TileMode tm; + int colorCount = RandomGradientParams(random, colors, &stops, &tm); + SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, + center2, radius2, + colors, stops, colorCount, + tm)); + SkPaint paint; + GrColor grColor; + GrEffectRef* grEffect; + shader->asNewEffect(context, paint, NULL, &grColor, &grEffect); + return grEffect; +} + +GLCircleInside2PtConicalEffect::GLCircleInside2PtConicalEffect(const GrBackendEffectFactory& factory, + const GrDrawEffect& drawEffect) + : INHERITED(factory) + , fVSVaryingName(NULL) + , fFSVaryingName(NULL) + , fCachedCenterX(SK_ScalarMax) + , fCachedCenterY(SK_ScalarMax) + , fCachedA(SK_ScalarMax) + , fCachedB(SK_ScalarMax) + , fCachedC(SK_ScalarMax) {} + +void GLCircleInside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect&, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) { + this->emitUniforms(builder, key); + fCenterUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, + kVec2f_GrSLType, "Conical2FSCenter"); + fParamUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, + kVec3f_GrSLType, "Conical2FSParams"); + SkString tName("t"); + + GrGLShaderVar center = builder->getUniformVariable(fCenterUni); + // params.x = A + // params.y = B + // params.z = C + GrGLShaderVar params = builder->getUniformVariable(fParamUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + SkString coords2DString = builder->ensureFSCoords2D(coords, 0); + const char* coords2D = coords2DString.c_str(); + + // p = coords2D + // e = center end + // r = radius end + // A = dot(e, e) - r^2 + 2 * r - 1 + // B = (r -1) / A + // C = 1 / A + // d = dot(e, p) + B + // t = d +/- sqrt(d^2 - A * dot(p, p) + C) + builder->fsCodeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); + builder->fsCodeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), params.c_str()); + builder->fsCodeAppendf("\tfloat %s = d + sqrt(d * d - %s.x * pDotp + %s.z);\n", + tName.c_str(), params.c_str(), params.c_str()); + + this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); +} + +void GLCircleInside2PtConicalEffect::setData(const GrGLUniformManager& uman, + const GrDrawEffect& drawEffect) { + INHERITED::setData(uman, drawEffect); + const CircleInside2PtConicalEffect& data = drawEffect.castEffect<CircleInside2PtConicalEffect>(); + SkScalar centerX = data.centerX(); + SkScalar centerY = data.centerY(); + SkScalar A = data.A(); + SkScalar B = data.B(); + SkScalar C = data.C(); + + if (fCachedCenterX != centerX || fCachedCenterY != centerY || + fCachedA != A || fCachedB != B || fCachedC != C) { + + uman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); + uman.set3f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C)); + + fCachedCenterX = centerX; + fCachedCenterY = centerY; + fCachedA = A; + fCachedB = B; + fCachedC = C; + } +} + +GrGLEffect::EffectKey GLCircleInside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, + const GrGLCaps&) { + EffectKey key = GenBaseGradientKey(drawEffect); + return key; +} + +////////////////////////////////////////////////////////////////////////////// + +class GLCircleOutside2PtConicalEffect; + +class CircleOutside2PtConicalEffect : public GrGradientEffect { +public: + + static GrEffectRef* Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + const CircleConicalInfo& info) { + AutoEffectUnref effect(SkNEW_ARGS(CircleOutside2PtConicalEffect, (ctx, shader, matrix, tm, info))); + return CreateEffectRef(effect); + } + + virtual ~CircleOutside2PtConicalEffect() {} + + static const char* Name() { return "Two-Point Conical Gradient Outside"; } + virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; + + SkScalar centerX() const { return fInfo.fCenterEnd.fX; } + SkScalar centerY() const { return fInfo.fCenterEnd.fY; } + SkScalar A() const { return fInfo.fA; } + SkScalar B() const { return fInfo.fB; } + SkScalar C() const { return fInfo.fC; } + SkScalar tLimit() const { return fTLimit; } + bool isFlipped() const { return fIsFlipped; } + + typedef GLCircleOutside2PtConicalEffect GLEffect; + +private: + virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE { + const CircleOutside2PtConicalEffect& s = CastEffect<CircleOutside2PtConicalEffect>(sBase); + return (INHERITED::onIsEqual(sBase) && + this->fInfo.fCenterEnd == s.fInfo.fCenterEnd && + this->fInfo.fA == s.fInfo.fA && + this->fInfo.fB == s.fInfo.fB && + this->fInfo.fC == s.fInfo.fC && + this->fTLimit == s.fTLimit && + this->fIsFlipped == s.fIsFlipped); + } + + CircleOutside2PtConicalEffect(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + const SkMatrix& matrix, + SkShader::TileMode tm, + const CircleConicalInfo& info) + : INHERITED(ctx, shader, matrix, tm), fInfo(info) { + if (shader.getStartRadius() != shader.getEndRadius()) { + fTLimit = SkScalarDiv(shader.getStartRadius(), (shader.getStartRadius() - shader.getEndRadius())); + } else { + fTLimit = SK_ScalarMin; + } + + fIsFlipped = shader.isFlippedGrad(); + } + + GR_DECLARE_EFFECT_TEST; + + const CircleConicalInfo fInfo; + SkScalar fTLimit; + bool fIsFlipped; + + typedef GrGradientEffect INHERITED; +}; + +class GLCircleOutside2PtConicalEffect : public GrGLGradientEffect { +public: + GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&); + virtual ~GLCircleOutside2PtConicalEffect() {} + + virtual void emitCode(GrGLShaderBuilder*, + const GrDrawEffect&, + EffectKey, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray&, + const TextureSamplerArray&) SK_OVERRIDE; + virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; + + static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps& caps); + +protected: + UniformHandle fCenterUni; + UniformHandle fParamUni; + + const char* fVSVaryingName; + const char* fFSVaryingName; + + bool fIsFlipped; + + // @{ + /// Values last uploaded as uniforms + + SkScalar fCachedCenterX; + SkScalar fCachedCenterY; + SkScalar fCachedA; + SkScalar fCachedB; + SkScalar fCachedC; + SkScalar fCachedTLimit; + + // @} + +private: + typedef GrGLGradientEffect INHERITED; + +}; + +const GrBackendEffectFactory& CircleOutside2PtConicalEffect::getFactory() const { + return GrTBackendEffectFactory<CircleOutside2PtConicalEffect>::getInstance(); +} + +GR_DEFINE_EFFECT_TEST(CircleOutside2PtConicalEffect); + +GrEffectRef* CircleOutside2PtConicalEffect::TestCreate(SkRandom* random, + GrContext* context, + const GrDrawTargetCaps&, + GrTexture**) { + SkPoint center1 = {random->nextUScalar1(), random->nextUScalar1()}; + SkScalar radius1 = random->nextUScalar1() + 0.0001f; // make sure radius1 != 0 + SkPoint center2; + SkScalar radius2; + SkScalar diffLen; + do { + center2.set(random->nextUScalar1(), random->nextUScalar1()); + // If the circles share a center than we can't be in the outside case + } while (center1 == center2); + SkPoint diff = center2 - center1; + diffLen = diff.length(); + // Below makes sure that circle one is not contained within circle two + // and have radius2 >= radius to match sorting on cpu side + radius2 = radius1 + random->nextRangeF(0.f, diffLen); + + SkColor colors[kMaxRandomGradientColors]; + SkScalar stopsArray[kMaxRandomGradientColors]; + SkScalar* stops = stopsArray; + SkShader::TileMode tm; + int colorCount = RandomGradientParams(random, colors, &stops, &tm); + SkAutoTUnref<SkShader> shader(SkGradientShader::CreateTwoPointConical(center1, radius1, + center2, radius2, + colors, stops, colorCount, + tm)); + SkPaint paint; + GrColor grColor; + GrEffectRef* grEffect; + shader->asNewEffect(context, paint, NULL, &grColor, &grEffect); + return grEffect; +} + +GLCircleOutside2PtConicalEffect::GLCircleOutside2PtConicalEffect(const GrBackendEffectFactory& factory, + const GrDrawEffect& drawEffect) + : INHERITED(factory) + , fVSVaryingName(NULL) + , fFSVaryingName(NULL) + , fCachedCenterX(SK_ScalarMax) + , fCachedCenterY(SK_ScalarMax) + , fCachedA(SK_ScalarMax) + , fCachedB(SK_ScalarMax) + , fCachedC(SK_ScalarMax) + , fCachedTLimit(SK_ScalarMax) { + const CircleOutside2PtConicalEffect& data = drawEffect.castEffect<CircleOutside2PtConicalEffect>(); + fIsFlipped = data.isFlipped(); + } + +void GLCircleOutside2PtConicalEffect::emitCode(GrGLShaderBuilder* builder, + const GrDrawEffect&, + EffectKey key, + const char* outputColor, + const char* inputColor, + const TransformedCoordsArray& coords, + const TextureSamplerArray& samplers) { + this->emitUniforms(builder, key); + fCenterUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, + kVec2f_GrSLType, "Conical2FSCenter"); + fParamUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility, + kVec4f_GrSLType, "Conical2FSParams"); + SkString tName("t"); + + GrGLShaderVar center = builder->getUniformVariable(fCenterUni); + // params.x = A + // params.y = B + // params.z = C + GrGLShaderVar params = builder->getUniformVariable(fParamUni); + + // if we have a vec3 from being in perspective, convert it to a vec2 first + SkString coords2DString = builder->ensureFSCoords2D(coords, 0); + const char* coords2D = coords2DString.c_str(); + + // output will default to transparent black (we simply won't write anything + // else to it if invalid, instead of discarding or returning prematurely) + builder->fsCodeAppendf("\t%s = vec4(0.0,0.0,0.0,0.0);\n", outputColor); + + // p = coords2D + // e = center end + // r = radius end + // A = dot(e, e) - r^2 + 2 * r - 1 + // B = (r -1) / A + // C = 1 / A + // d = dot(e, p) + B + // t = d +/- sqrt(d^2 - A * dot(p, p) + C) + + builder->fsCodeAppendf("\tfloat pDotp = dot(%s, %s);\n", coords2D, coords2D); + builder->fsCodeAppendf("\tfloat d = dot(%s, %s) + %s.y;\n", coords2D, center.c_str(), params.c_str()); + builder->fsCodeAppendf("\tfloat deter = d * d - %s.x * pDotp + %s.z;\n", params.c_str(), params.c_str()); + + // Must check to see if we flipped the circle order (to make sure start radius < end radius) + // If so we must also flip sign on sqrt + if (!fIsFlipped) { + builder->fsCodeAppendf("\tfloat %s = d + sqrt(deter);\n", tName.c_str()); + } else { + builder->fsCodeAppendf("\tfloat %s = d - sqrt(deter);\n", tName.c_str()); + } + + builder->fsCodeAppendf("\tif (%s >= %s.w && deter >= 0.0) {\n", tName.c_str(), params.c_str()); + builder->fsCodeAppend("\t\t"); + this->emitColor(builder, tName.c_str(), key, outputColor, inputColor, samplers); + builder->fsCodeAppend("\t}\n"); +} + +void GLCircleOutside2PtConicalEffect::setData(const GrGLUniformManager& uman, + const GrDrawEffect& drawEffect) { + INHERITED::setData(uman, drawEffect); + const CircleOutside2PtConicalEffect& data = drawEffect.castEffect<CircleOutside2PtConicalEffect>(); + SkASSERT(data.isFlipped() == fIsFlipped); + SkScalar centerX = data.centerX(); + SkScalar centerY = data.centerY(); + SkScalar A = data.A(); + SkScalar B = data.B(); + SkScalar C = data.C(); + SkScalar tLimit = data.tLimit(); + + if (fCachedCenterX != centerX || fCachedCenterY != centerY || + fCachedA != A || fCachedB != B || fCachedC != C || fCachedTLimit != tLimit) { + + uman.set2f(fCenterUni, SkScalarToFloat(centerX), SkScalarToFloat(centerY)); + uman.set4f(fParamUni, SkScalarToFloat(A), SkScalarToFloat(B), SkScalarToFloat(C), + SkScalarToFloat(tLimit)); + + fCachedCenterX = centerX; + fCachedCenterY = centerY; + fCachedA = A; + fCachedB = B; + fCachedC = C; + fCachedTLimit = tLimit; + } +} + +GrGLEffect::EffectKey GLCircleOutside2PtConicalEffect::GenKey(const GrDrawEffect& drawEffect, + const GrGLCaps&) { + enum { + kIsFlipped = 1 << kBaseKeyBitCnt, + }; + + EffectKey key = GenBaseGradientKey(drawEffect); + + if (drawEffect.castEffect<CircleOutside2PtConicalEffect>().isFlipped()) { + key |= kIsFlipped; + } + return key; +} + +////////////////////////////////////////////////////////////////////////////// + +GrEffectRef* Gr2PtConicalGradientEffect::Create(GrContext* ctx, + const SkTwoPointConicalGradient& shader, + SkShader::TileMode tm, + const SkMatrix* localMatrix) { + SkMatrix matrix; + if (!shader.getLocalMatrix().invert(&matrix)) { + return NULL; + } + if (localMatrix) { + SkMatrix inv; + if (!localMatrix->invert(&inv)) { + return NULL; + } + matrix.postConcat(inv); + } + + if (shader.getStartRadius() < kErrorTol) { + SkScalar focalX; + ConicalType type = set_matrix_focal_conical(shader, &matrix, &focalX); + if (type == kInside_ConicalType) { + return FocalInside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); + } else if(type == kEdge_ConicalType) { + set_matrix_edge_conical(shader, &matrix); + return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); + } else { + return FocalOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, focalX); + } + } + + CircleConicalInfo info; + ConicalType type = set_matrix_circle_conical(shader, &matrix, &info); + + if (type == kInside_ConicalType) { + return CircleInside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); + } else if (type == kEdge_ConicalType) { + set_matrix_edge_conical(shader, &matrix); + return Edge2PtConicalEffect::Create(ctx, shader, matrix, tm); + } else { + return CircleOutside2PtConicalEffect::Create(ctx, shader, matrix, tm, info); + } +} + +#endif |