The Tor Browser: gfx/skia/trunk/src/gpu/GrOvalRenderer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrOvalRenderer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrOvalRenderer.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrOvalRenderer.h"
 #include "GrEffect.h"
 #include "gl/GrGLEffect.h"
 #include "gl/GrGLSL.h"
 #include "gl/GrGLVertexEffect.h"
 #include "GrTBackendEffectFactory.h"
 #include "GrDrawState.h"
 #include "GrDrawTarget.h"
 #include "GrGpu.h"
 #include "SkRRect.h"
 #include "SkStrokeRec.h"
 #include "effects/GrVertexEffect.h"
 namespace {
 struct CircleVertex {
     GrPoint  fPos;
     GrPoint  fOffset;
     SkScalar fOuterRadius;
     SkScalar fInnerRadius;
 };
 struct EllipseVertex {
     GrPoint  fPos;
     GrPoint  fOffset;
     GrPoint  fOuterRadii;
     GrPoint  fInnerRadii;
 };
 struct DIEllipseVertex {
     GrPoint  fPos;
     GrPoint  fOuterOffset;
     GrPoint  fInnerOffset;
 };
 inline bool circle_stays_circle(const SkMatrix& m) {
     return m.isSimilarity();
 }
 }
 ///////////////////////////////////////////////////////////////////////////////
 /**
  * The output of this effect is a modulation of the input color and coverage for a circle,
  * specified as offset_x, offset_y (both from center point), outer radius and inner radius.
  */
 class CircleEdgeEffect : public GrVertexEffect {
 public:
     static GrEffectRef* Create(bool stroke) {
         GR_CREATE_STATIC_EFFECT(gCircleStrokeEdge, CircleEdgeEffect, (true));
         GR_CREATE_STATIC_EFFECT(gCircleFillEdge, CircleEdgeEffect, (false));
         if (stroke) {
             gCircleStrokeEdge->ref();
             return gCircleStrokeEdge;
         } else {
             gCircleFillEdge->ref();
             return gCircleFillEdge;
         }
     }
     virtual void getConstantColorComponents(GrColor* color,
                                             uint32_t* validFlags) const SK_OVERRIDE {
         *validFlags = 0;
     }
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE {
         return GrTBackendEffectFactory<CircleEdgeEffect>::getInstance();
     }
     virtual ~CircleEdgeEffect() {}
     static const char* Name() { return "CircleEdge"; }
     inline bool isStroked() const { return fStroke; }
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
                               const char* inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const CircleEdgeEffect& circleEffect = drawEffect.castEffect<CircleEdgeEffect>();
             const char *vsName, *fsName;
             builder->addVarying(kVec4f_GrSLType, "CircleEdge", &vsName, &fsName);
             const SkString* attrName =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsName, attrName->c_str());
             builder->fsCodeAppendf("\tfloat d = length(%s.xy);\n", fsName);
             builder->fsCodeAppendf("\tfloat edgeAlpha = clamp(%s.z - d, 0.0, 1.0);\n", fsName);
             if (circleEffect.isStroked()) {
                 builder->fsCodeAppendf("\tfloat innerAlpha = clamp(d - %s.w, 0.0, 1.0);\n", fsName);
                 builder->fsCodeAppend("\tedgeAlpha *= innerAlpha;\n");
             }
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
                                    (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
         }
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const CircleEdgeEffect& circleEffect = drawEffect.castEffect<CircleEdgeEffect>();
             return circleEffect.isStroked() ? 0x1 : 0x0;
         }
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {}
     private:
         typedef GrGLVertexEffect INHERITED;
     };
 private:
     CircleEdgeEffect(bool stroke) : GrVertexEffect() {
         this->addVertexAttrib(kVec4f_GrSLType);
         fStroke = stroke;
     }
     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
         const CircleEdgeEffect& cee = CastEffect<CircleEdgeEffect>(other);
         return cee.fStroke == fStroke;
     }
     bool fStroke;
     GR_DECLARE_EFFECT_TEST;
     typedef GrVertexEffect INHERITED;
 };
 GR_DEFINE_EFFECT_TEST(CircleEdgeEffect);
 GrEffectRef* CircleEdgeEffect::TestCreate(SkRandom* random,
                                           GrContext* context,
                                           const GrDrawTargetCaps&,
                                           GrTexture* textures[]) {
     return CircleEdgeEffect::Create(random->nextBool());
 }
 ///////////////////////////////////////////////////////////////////////////////
 /**
  * The output of this effect is a modulation of the input color and coverage for an axis-aligned
  * ellipse, specified as a 2D offset from center, and the reciprocals of the outer and inner radii,
  * in both x and y directions.
  *
  * We are using an implicit function of x^2/a^2 + y^2/b^2 - 1 = 0.
  */
 class EllipseEdgeEffect : public GrVertexEffect {
 public:
     static GrEffectRef* Create(bool stroke) {
         GR_CREATE_STATIC_EFFECT(gEllipseStrokeEdge, EllipseEdgeEffect, (true));
         GR_CREATE_STATIC_EFFECT(gEllipseFillEdge, EllipseEdgeEffect, (false));
         if (stroke) {
             gEllipseStrokeEdge->ref();
             return gEllipseStrokeEdge;
         } else {
             gEllipseFillEdge->ref();
             return gEllipseFillEdge;
         }
     }
     virtual void getConstantColorComponents(GrColor* color,
                                             uint32_t* validFlags) const SK_OVERRIDE {
         *validFlags = 0;
     }
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE {
         return GrTBackendEffectFactory<EllipseEdgeEffect>::getInstance();
     }
     virtual ~EllipseEdgeEffect() {}
     static const char* Name() { return "EllipseEdge"; }
     inline bool isStroked() const { return fStroke; }
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
                               const char* inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const EllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<EllipseEdgeEffect>();
             const char *vsOffsetName, *fsOffsetName;
             const char *vsRadiiName, *fsRadiiName;
             builder->addVarying(kVec2f_GrSLType, "EllipseOffsets", &vsOffsetName, &fsOffsetName);
             const SkString* attr0Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName, attr0Name->c_str());
             builder->addVarying(kVec4f_GrSLType, "EllipseRadii", &vsRadiiName, &fsRadiiName);
             const SkString* attr1Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[1]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsRadiiName, attr1Name->c_str());
             // for outer curve
             builder->fsCodeAppendf("\tvec2 scaledOffset = %s*%s.xy;\n", fsOffsetName, fsRadiiName);
             builder->fsCodeAppend("\tfloat test = dot(scaledOffset, scaledOffset) - 1.0;\n");
             builder->fsCodeAppendf("\tvec2 grad = 2.0*scaledOffset*%s.xy;\n", fsRadiiName);
             builder->fsCodeAppend("\tfloat grad_dot = dot(grad, grad);\n");
             // we need to clamp the length^2 of the gradiant vector to a non-zero value, because
             // on the Nexus 4 the undefined result of inversesqrt(0) drops out an entire tile
             // TODO: restrict this to Adreno-only
             builder->fsCodeAppend("\tgrad_dot = max(grad_dot, 1.0e-4);\n");
             builder->fsCodeAppend("\tfloat invlen = inversesqrt(grad_dot);\n");
             builder->fsCodeAppend("\tfloat edgeAlpha = clamp(0.5-test*invlen, 0.0, 1.0);\n");
             // for inner curve
             if (ellipseEffect.isStroked()) {
                 builder->fsCodeAppendf("\tscaledOffset = %s*%s.zw;\n", fsOffsetName, fsRadiiName);
                 builder->fsCodeAppend("\ttest = dot(scaledOffset, scaledOffset) - 1.0;\n");
                 builder->fsCodeAppendf("\tgrad = 2.0*scaledOffset*%s.zw;\n", fsRadiiName);
                 builder->fsCodeAppend("\tinvlen = inversesqrt(dot(grad, grad));\n");
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
                                    (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
         }
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const EllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<EllipseEdgeEffect>();
             return ellipseEffect.isStroked() ? 0x1 : 0x0;
         }
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
         }
     private:
         typedef GrGLVertexEffect INHERITED;
     };
 private:
     EllipseEdgeEffect(bool stroke) : GrVertexEffect() {
         this->addVertexAttrib(kVec2f_GrSLType);
         this->addVertexAttrib(kVec4f_GrSLType);
         fStroke = stroke;
     }
     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
         const EllipseEdgeEffect& eee = CastEffect<EllipseEdgeEffect>(other);
         return eee.fStroke == fStroke;
     }
     bool fStroke;
     GR_DECLARE_EFFECT_TEST;
     typedef GrVertexEffect INHERITED;
 };
 GR_DEFINE_EFFECT_TEST(EllipseEdgeEffect);
 GrEffectRef* EllipseEdgeEffect::TestCreate(SkRandom* random,
                                            GrContext* context,
                                            const GrDrawTargetCaps&,
                                            GrTexture* textures[]) {
     return EllipseEdgeEffect::Create(random->nextBool());
 }
 ///////////////////////////////////////////////////////////////////////////////
 /**
  * The output of this effect is a modulation of the input color and coverage for an ellipse,
  * specified as a 2D offset from center for both the outer and inner paths (if stroked). The
  * implict equation used is for a unit circle (x^2 + y^2 - 1 = 0) and the edge corrected by
  * using differentials.
  *
  * The result is device-independent and can be used with any affine matrix.
  */
 class DIEllipseEdgeEffect : public GrVertexEffect {
 public:
     enum Mode { kStroke = 0, kHairline, kFill };
     static GrEffectRef* Create(Mode mode) {
         GR_CREATE_STATIC_EFFECT(gEllipseStrokeEdge, DIEllipseEdgeEffect, (kStroke));
         GR_CREATE_STATIC_EFFECT(gEllipseHairlineEdge, DIEllipseEdgeEffect, (kHairline));
         GR_CREATE_STATIC_EFFECT(gEllipseFillEdge, DIEllipseEdgeEffect, (kFill));
         if (kStroke == mode) {
             gEllipseStrokeEdge->ref();
             return gEllipseStrokeEdge;
         } else if (kHairline == mode) {
             gEllipseHairlineEdge->ref();
             return gEllipseHairlineEdge;
         } else {
             gEllipseFillEdge->ref();
             return gEllipseFillEdge;
         }
     }
     virtual void getConstantColorComponents(GrColor* color,
                                             uint32_t* validFlags) const SK_OVERRIDE {
         *validFlags = 0;
     }
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE {
         return GrTBackendEffectFactory<DIEllipseEdgeEffect>::getInstance();
     }
     virtual ~DIEllipseEdgeEffect() {}
     static const char* Name() { return "DIEllipseEdge"; }
     inline Mode getMode() const { return fMode; }
     class GLEffect : public GrGLVertexEffect {
     public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
         virtual void emitCode(GrGLFullShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
                               const char* inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const DIEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<DIEllipseEdgeEffect>();
             SkAssertResult(builder->enableFeature(
                                               GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
             const char *vsOffsetName0, *fsOffsetName0;
             builder->addVarying(kVec2f_GrSLType, "EllipseOffsets0",
                                       &vsOffsetName0, &fsOffsetName0);
             const SkString* attr0Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName0, attr0Name->c_str());
             const char *vsOffsetName1, *fsOffsetName1;
             builder->addVarying(kVec2f_GrSLType, "EllipseOffsets1",
                                       &vsOffsetName1, &fsOffsetName1);
             const SkString* attr1Name =
                 builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[1]);
             builder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName1, attr1Name->c_str());
             // for outer curve
             builder->fsCodeAppendf("\tvec2 scaledOffset = %s.xy;\n", fsOffsetName0);
             builder->fsCodeAppend("\tfloat test = dot(scaledOffset, scaledOffset) - 1.0;\n");
             builder->fsCodeAppendf("\tvec2 duvdx = dFdx(%s);\n", fsOffsetName0);
             builder->fsCodeAppendf("\tvec2 duvdy = dFdy(%s);\n", fsOffsetName0);
             builder->fsCodeAppendf("\tvec2 grad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,\n"
                                    "\t                 2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);\n",
                                    fsOffsetName0, fsOffsetName0, fsOffsetName0, fsOffsetName0);
             builder->fsCodeAppend("\tfloat grad_dot = dot(grad, grad);\n");
             // we need to clamp the length^2 of the gradiant vector to a non-zero value, because
             // on the Nexus 4 the undefined result of inversesqrt(0) drops out an entire tile
             // TODO: restrict this to Adreno-only
             builder->fsCodeAppend("\tgrad_dot = max(grad_dot, 1.0e-4);\n");
             builder->fsCodeAppend("\tfloat invlen = inversesqrt(grad_dot);\n");
             if (kHairline == ellipseEffect.getMode()) {
                 // can probably do this with one step
                 builder->fsCodeAppend("\tfloat edgeAlpha = clamp(1.0-test*invlen, 0.0, 1.0);\n");
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(1.0+test*invlen, 0.0, 1.0);\n");
             } else {
                 builder->fsCodeAppend("\tfloat edgeAlpha = clamp(0.5-test*invlen, 0.0, 1.0);\n");
             }
             // for inner curve
             if (kStroke == ellipseEffect.getMode()) {
                 builder->fsCodeAppendf("\tscaledOffset = %s.xy;\n", fsOffsetName1);
                 builder->fsCodeAppend("\ttest = dot(scaledOffset, scaledOffset) - 1.0;\n");
                 builder->fsCodeAppendf("\tduvdx = dFdx(%s);\n", fsOffsetName1);
                 builder->fsCodeAppendf("\tduvdy = dFdy(%s);\n", fsOffsetName1);
                 builder->fsCodeAppendf("\tgrad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,\n"
                                        "\t            2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);\n",
                                        fsOffsetName1, fsOffsetName1, fsOffsetName1, fsOffsetName1);
                 builder->fsCodeAppend("\tinvlen = inversesqrt(dot(grad, grad));\n");
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
                                    (GrGLSLExpr4(inputColor) * GrGLSLExpr1("edgeAlpha")).c_str());
         }
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
             const DIEllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<DIEllipseEdgeEffect>();
             return ellipseEffect.getMode();
         }
         virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE {
         }
     private:
         typedef GrGLVertexEffect INHERITED;
     };
 private:
     DIEllipseEdgeEffect(Mode mode) : GrVertexEffect() {
         this->addVertexAttrib(kVec2f_GrSLType);
         this->addVertexAttrib(kVec2f_GrSLType);
         fMode = mode;
     }
     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE {
         const DIEllipseEdgeEffect& eee = CastEffect<DIEllipseEdgeEffect>(other);
         return eee.fMode == fMode;
     }
     Mode fMode;
     GR_DECLARE_EFFECT_TEST;
     typedef GrVertexEffect INHERITED;
 };
 GR_DEFINE_EFFECT_TEST(DIEllipseEdgeEffect);
 GrEffectRef* DIEllipseEdgeEffect::TestCreate(SkRandom* random,
                                              GrContext* context,
                                              const GrDrawTargetCaps&,
                                              GrTexture* textures[]) {
     return DIEllipseEdgeEffect::Create((Mode)(random->nextRangeU(0,2)));
 }
 ///////////////////////////////////////////////////////////////////////////////
 void GrOvalRenderer::reset() {
     SkSafeSetNull(fRRectIndexBuffer);
 }
 bool GrOvalRenderer::drawOval(GrDrawTarget* target, const GrContext* context, bool useAA,
                               const SkRect& oval, const SkStrokeRec& stroke)
 {
     bool useCoverageAA = useAA &&
         !target->getDrawState().getRenderTarget()->isMultisampled() &&
         !target->shouldDisableCoverageAAForBlend();
     if (!useCoverageAA) {
         return false;
     }
     const SkMatrix& vm = context->getMatrix();
     // we can draw circles
     if (SkScalarNearlyEqual(oval.width(), oval.height())
         && circle_stays_circle(vm)) {
         this->drawCircle(target, useCoverageAA, oval, stroke);
     // if we have shader derivative support, render as device-independent
     } else if (target->caps()->shaderDerivativeSupport()) {
         return this->drawDIEllipse(target, useCoverageAA, oval, stroke);
     // otherwise axis-aligned ellipses only
     } else if (vm.rectStaysRect()) {
         return this->drawEllipse(target, useCoverageAA, oval, stroke);
     } else {
         return false;
     }
     return true;
 }
 ///////////////////////////////////////////////////////////////////////////////
 // position + edge
 extern const GrVertexAttrib gCircleVertexAttribs[] = {
     {kVec2f_GrVertexAttribType, 0,               kPosition_GrVertexAttribBinding},
     {kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
 };
 void GrOvalRenderer::drawCircle(GrDrawTarget* target,
                                 bool useCoverageAA,
                                 const SkRect& circle,
                                 const SkStrokeRec& stroke)
 {
     GrDrawState* drawState = target->drawState();
     const SkMatrix& vm = drawState->getViewMatrix();
     GrPoint center = GrPoint::Make(circle.centerX(), circle.centerY());
     vm.mapPoints(&center, 1);
     SkScalar radius = vm.mapRadius(SkScalarHalf(circle.width()));
     SkScalar strokeWidth = vm.mapRadius(stroke.getWidth());
     GrDrawState::AutoViewMatrixRestore avmr;
     if (!avmr.setIdentity(drawState)) {
         return;
     }
     drawState->setVertexAttribs<gCircleVertexAttribs>(SK_ARRAY_COUNT(gCircleVertexAttribs));
     SkASSERT(sizeof(CircleVertex) == drawState->getVertexSize());
     GrDrawTarget::AutoReleaseGeometry geo(target, 4, 0);
     if (!geo.succeeded()) {
         GrPrintf("Failed to get space for vertices!\n");
         return;
     }
     CircleVertex* verts = reinterpret_cast<CircleVertex*>(geo.vertices());
     SkStrokeRec::Style style = stroke.getStyle();
     bool isStroked = (SkStrokeRec::kStroke_Style == style || SkStrokeRec::kHairline_Style == style);
     SkScalar innerRadius = 0.0f;
     SkScalar outerRadius = radius;
     SkScalar halfWidth = 0;
     if (style != SkStrokeRec::kFill_Style) {
         if (SkScalarNearlyZero(strokeWidth)) {
             halfWidth = SK_ScalarHalf;
         } else {
             halfWidth = SkScalarHalf(strokeWidth);
         }
         outerRadius += halfWidth;
         if (isStroked) {
             innerRadius = radius - halfWidth;
         }
     }
     GrEffectRef* effect = CircleEdgeEffect::Create(isStroked && innerRadius > 0);
     static const int kCircleEdgeAttrIndex = 1;
     drawState->addCoverageEffect(effect, kCircleEdgeAttrIndex)->unref();
     // The radii are outset for two reasons. First, it allows the shader to simply perform
     // clamp(distance-to-center - radius, 0, 1). Second, the outer radius is used to compute the
     // verts of the bounding box that is rendered and the outset ensures the box will cover all
     // pixels partially covered by the circle.
     outerRadius += SK_ScalarHalf;
     innerRadius -= SK_ScalarHalf;
     SkRect bounds = SkRect::MakeLTRB(
         center.fX - outerRadius,
         center.fY - outerRadius,
         center.fX + outerRadius,
         center.fY + outerRadius
     );
     verts[0].fPos = SkPoint::Make(bounds.fLeft,  bounds.fTop);
     verts[0].fOffset = SkPoint::Make(-outerRadius, -outerRadius);
     verts[0].fOuterRadius = outerRadius;
     verts[0].fInnerRadius = innerRadius;
     verts[1].fPos = SkPoint::Make(bounds.fRight, bounds.fTop);
     verts[1].fOffset = SkPoint::Make(outerRadius, -outerRadius);
     verts[1].fOuterRadius = outerRadius;
     verts[1].fInnerRadius = innerRadius;
     verts[2].fPos = SkPoint::Make(bounds.fLeft,  bounds.fBottom);
     verts[2].fOffset = SkPoint::Make(-outerRadius, outerRadius);
     verts[2].fOuterRadius = outerRadius;
     verts[2].fInnerRadius = innerRadius;
     verts[3].fPos = SkPoint::Make(bounds.fRight, bounds.fBottom);
     verts[3].fOffset = SkPoint::Make(outerRadius, outerRadius);
     verts[3].fOuterRadius = outerRadius;
     verts[3].fInnerRadius = innerRadius;
     target->drawNonIndexed(kTriangleStrip_GrPrimitiveType, 0, 4, &bounds);
 }
 ///////////////////////////////////////////////////////////////////////////////
 // position + offset + 1/radii
 extern const GrVertexAttrib gEllipseVertexAttribs[] = {
     {kVec2f_GrVertexAttribType, 0,                 kPosition_GrVertexAttribBinding},
     {kVec2f_GrVertexAttribType, sizeof(GrPoint),   kEffect_GrVertexAttribBinding},
     {kVec4f_GrVertexAttribType, 2*sizeof(GrPoint), kEffect_GrVertexAttribBinding}
 };
 // position + offsets
 extern const GrVertexAttrib gDIEllipseVertexAttribs[] = {
     {kVec2f_GrVertexAttribType, 0,                 kPosition_GrVertexAttribBinding},
     {kVec2f_GrVertexAttribType, sizeof(GrPoint),   kEffect_GrVertexAttribBinding},
     {kVec2f_GrVertexAttribType, 2*sizeof(GrPoint), kEffect_GrVertexAttribBinding},
 };
 bool GrOvalRenderer::drawEllipse(GrDrawTarget* target,
                                  bool useCoverageAA,
                                  const SkRect& ellipse,
                                  const SkStrokeRec& stroke)
 {
     GrDrawState* drawState = target->drawState();
 #ifdef SK_DEBUG
     {
         // we should have checked for this previously
         bool isAxisAlignedEllipse = drawState->getViewMatrix().rectStaysRect();
         SkASSERT(useCoverageAA && isAxisAlignedEllipse);
     }
 #endif
     // do any matrix crunching before we reset the draw state for device coords
     const SkMatrix& vm = drawState->getViewMatrix();
     GrPoint center = GrPoint::Make(ellipse.centerX(), ellipse.centerY());
     vm.mapPoints(&center, 1);
     SkScalar ellipseXRadius = SkScalarHalf(ellipse.width());
     SkScalar ellipseYRadius = SkScalarHalf(ellipse.height());
     SkScalar xRadius = SkScalarAbs(vm[SkMatrix::kMScaleX]*ellipseXRadius +
                                    vm[SkMatrix::kMSkewY]*ellipseYRadius);
     SkScalar yRadius = SkScalarAbs(vm[SkMatrix::kMSkewX]*ellipseXRadius +
                                    vm[SkMatrix::kMScaleY]*ellipseYRadius);
     // do (potentially) anisotropic mapping of stroke
     SkVector scaledStroke;
     SkScalar strokeWidth = stroke.getWidth();
     scaledStroke.fX = SkScalarAbs(strokeWidth*(vm[SkMatrix::kMScaleX] + vm[SkMatrix::kMSkewY]));
     scaledStroke.fY = SkScalarAbs(strokeWidth*(vm[SkMatrix::kMSkewX] + vm[SkMatrix::kMScaleY]));
     SkStrokeRec::Style style = stroke.getStyle();
     bool isStroked = (SkStrokeRec::kStroke_Style == style || SkStrokeRec::kHairline_Style == style);
     SkScalar innerXRadius = 0;
     SkScalar innerYRadius = 0;
     if (SkStrokeRec::kFill_Style != style) {
         if (SkScalarNearlyZero(scaledStroke.length())) {
             scaledStroke.set(SK_ScalarHalf, SK_ScalarHalf);
         } else {
             scaledStroke.scale(SK_ScalarHalf);
         }
         // we only handle thick strokes for near-circular ellipses
         if (scaledStroke.length() > SK_ScalarHalf &&
             (SK_ScalarHalf*xRadius > yRadius || SK_ScalarHalf*yRadius > xRadius)) {
             return false;
         }
         // we don't handle it if curvature of the stroke is less than curvature of the ellipse
         if (scaledStroke.fX*(yRadius*yRadius) < (scaledStroke.fY*scaledStroke.fY)*xRadius ||
             scaledStroke.fY*(xRadius*xRadius) < (scaledStroke.fX*scaledStroke.fX)*yRadius) {
             return false;
         }
         // this is legit only if scale & translation (which should be the case at the moment)
         if (isStroked) {
             innerXRadius = xRadius - scaledStroke.fX;
             innerYRadius = yRadius - scaledStroke.fY;
         }
         xRadius += scaledStroke.fX;
         yRadius += scaledStroke.fY;
     }
     GrDrawState::AutoViewMatrixRestore avmr;
     if (!avmr.setIdentity(drawState)) {
         return false;
     }
     drawState->setVertexAttribs<gEllipseVertexAttribs>(SK_ARRAY_COUNT(gEllipseVertexAttribs));
     SkASSERT(sizeof(EllipseVertex) == drawState->getVertexSize());
     GrDrawTarget::AutoReleaseGeometry geo(target, 4, 0);
     if (!geo.succeeded()) {
         GrPrintf("Failed to get space for vertices!\n");
         return false;
     }
     EllipseVertex* verts = reinterpret_cast<EllipseVertex*>(geo.vertices());
     GrEffectRef* effect = EllipseEdgeEffect::Create(isStroked &&
                                                     innerXRadius > 0 && innerYRadius > 0);
     static const int kEllipseCenterAttrIndex = 1;
     static const int kEllipseEdgeAttrIndex = 2;
     drawState->addCoverageEffect(effect, kEllipseCenterAttrIndex, kEllipseEdgeAttrIndex)->unref();
     // Compute the reciprocals of the radii here to save time in the shader
     SkScalar xRadRecip = SkScalarInvert(xRadius);
     SkScalar yRadRecip = SkScalarInvert(yRadius);
     SkScalar xInnerRadRecip = SkScalarInvert(innerXRadius);
     SkScalar yInnerRadRecip = SkScalarInvert(innerYRadius);
     // We've extended the outer x radius out half a pixel to antialias.
     // This will also expand the rect so all the pixels will be captured.
     // TODO: Consider if we should use sqrt(2)/2 instead
     xRadius += SK_ScalarHalf;
     yRadius += SK_ScalarHalf;
     SkRect bounds = SkRect::MakeLTRB(
         center.fX - xRadius,
         center.fY - yRadius,
         center.fX + xRadius,
         center.fY + yRadius
     );
     verts[0].fPos = SkPoint::Make(bounds.fLeft,  bounds.fTop);
     verts[0].fOffset = SkPoint::Make(-xRadius, -yRadius);
     verts[0].fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
     verts[0].fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
     verts[1].fPos = SkPoint::Make(bounds.fRight, bounds.fTop);
     verts[1].fOffset = SkPoint::Make(xRadius, -yRadius);
     verts[1].fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
     verts[1].fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
     verts[2].fPos = SkPoint::Make(bounds.fLeft,  bounds.fBottom);
     verts[2].fOffset = SkPoint::Make(-xRadius, yRadius);
     verts[2].fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
     verts[2].fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
     verts[3].fPos = SkPoint::Make(bounds.fRight, bounds.fBottom);
     verts[3].fOffset = SkPoint::Make(xRadius, yRadius);
     verts[3].fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
     verts[3].fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
     target->drawNonIndexed(kTriangleStrip_GrPrimitiveType, 0, 4, &bounds);
     return true;
 }
 bool GrOvalRenderer::drawDIEllipse(GrDrawTarget* target,
                                    bool useCoverageAA,
                                    const SkRect& ellipse,
                                    const SkStrokeRec& stroke)
 {
     GrDrawState* drawState = target->drawState();
     const SkMatrix& vm = drawState->getViewMatrix();
     GrPoint center = GrPoint::Make(ellipse.centerX(), ellipse.centerY());
     SkScalar xRadius = SkScalarHalf(ellipse.width());
     SkScalar yRadius = SkScalarHalf(ellipse.height());
     SkStrokeRec::Style style = stroke.getStyle();
     DIEllipseEdgeEffect::Mode mode = (SkStrokeRec::kStroke_Style == style) ?
                                     DIEllipseEdgeEffect::kStroke :
                                     (SkStrokeRec::kHairline_Style == style) ?
                                     DIEllipseEdgeEffect::kHairline : DIEllipseEdgeEffect::kFill;
     SkScalar innerXRadius = 0;
     SkScalar innerYRadius = 0;
     if (SkStrokeRec::kFill_Style != style && SkStrokeRec::kHairline_Style != style) {
         SkScalar strokeWidth = stroke.getWidth();
         if (SkScalarNearlyZero(strokeWidth)) {
             strokeWidth = SK_ScalarHalf;
         } else {
             strokeWidth *= SK_ScalarHalf;
         }
         // we only handle thick strokes for near-circular ellipses
         if (strokeWidth > SK_ScalarHalf &&
             (SK_ScalarHalf*xRadius > yRadius || SK_ScalarHalf*yRadius > xRadius)) {
             return false;
         }
         // we don't handle it if curvature of the stroke is less than curvature of the ellipse
         if (strokeWidth*(yRadius*yRadius) < (strokeWidth*strokeWidth)*xRadius ||
             strokeWidth*(xRadius*xRadius) < (strokeWidth*strokeWidth)*yRadius) {
             return false;
         }
         // set inner radius (if needed)
         if (SkStrokeRec::kStroke_Style == style) {
             innerXRadius = xRadius - strokeWidth;
             innerYRadius = yRadius - strokeWidth;
         }
         xRadius += strokeWidth;
         yRadius += strokeWidth;
     }
     if (DIEllipseEdgeEffect::kStroke == mode) {
         mode = (innerXRadius > 0 && innerYRadius > 0) ? DIEllipseEdgeEffect::kStroke :
                                                         DIEllipseEdgeEffect::kFill;
     }
     SkScalar innerRatioX = SkScalarDiv(xRadius, innerXRadius);
     SkScalar innerRatioY = SkScalarDiv(yRadius, innerYRadius);
     drawState->setVertexAttribs<gDIEllipseVertexAttribs>(SK_ARRAY_COUNT(gDIEllipseVertexAttribs));
     SkASSERT(sizeof(DIEllipseVertex) == drawState->getVertexSize());
     GrDrawTarget::AutoReleaseGeometry geo(target, 4, 0);
     if (!geo.succeeded()) {
         GrPrintf("Failed to get space for vertices!\n");
         return false;
     }
     DIEllipseVertex* verts = reinterpret_cast<DIEllipseVertex*>(geo.vertices());
     GrEffectRef* effect = DIEllipseEdgeEffect::Create(mode);
     static const int kEllipseOuterOffsetAttrIndex = 1;
     static const int kEllipseInnerOffsetAttrIndex = 2;
     drawState->addCoverageEffect(effect, kEllipseOuterOffsetAttrIndex,
                                          kEllipseInnerOffsetAttrIndex)->unref();
     // This expands the outer rect so that after CTM we end up with a half-pixel border
     SkScalar a = vm[SkMatrix::kMScaleX];
     SkScalar b = vm[SkMatrix::kMSkewX];
     SkScalar c = vm[SkMatrix::kMSkewY];
     SkScalar d = vm[SkMatrix::kMScaleY];
     SkScalar geoDx = SkScalarDiv(SK_ScalarHalf, SkScalarSqrt(a*a + c*c));
     SkScalar geoDy = SkScalarDiv(SK_ScalarHalf, SkScalarSqrt(b*b + d*d));
     // This adjusts the "radius" to include the half-pixel border
     SkScalar offsetDx = SkScalarDiv(geoDx, xRadius);
     SkScalar offsetDy = SkScalarDiv(geoDy, yRadius);
     SkRect bounds = SkRect::MakeLTRB(
         center.fX - xRadius - geoDx,
         center.fY - yRadius - geoDy,
         center.fX + xRadius + geoDx,
         center.fY + yRadius + geoDy
     );
     verts[0].fPos = SkPoint::Make(bounds.fLeft, bounds.fTop);
     verts[0].fOuterOffset = SkPoint::Make(-1.0f - offsetDx, -1.0f - offsetDy);
     verts[0].fInnerOffset = SkPoint::Make(-innerRatioX - offsetDx, -innerRatioY - offsetDy);
     verts[1].fPos = SkPoint::Make(bounds.fRight, bounds.fTop);
     verts[1].fOuterOffset = SkPoint::Make(1.0f + offsetDx, -1.0f - offsetDy);
     verts[1].fInnerOffset = SkPoint::Make(innerRatioX + offsetDx, -innerRatioY - offsetDy);
     verts[2].fPos = SkPoint::Make(bounds.fLeft,  bounds.fBottom);
     verts[2].fOuterOffset = SkPoint::Make(-1.0f - offsetDx, 1.0f + offsetDy);
     verts[2].fInnerOffset = SkPoint::Make(-innerRatioX - offsetDx, innerRatioY + offsetDy);
     verts[3].fPos = SkPoint::Make(bounds.fRight, bounds.fBottom);
     verts[3].fOuterOffset = SkPoint::Make(1.0f + offsetDx, 1.0f + offsetDy);
     verts[3].fInnerOffset = SkPoint::Make(innerRatioX + offsetDx, innerRatioY + offsetDy);
     target->drawNonIndexed(kTriangleStrip_GrPrimitiveType, 0, 4, &bounds);
     return true;
 }
 ///////////////////////////////////////////////////////////////////////////////
 static const uint16_t gRRectIndices[] = {
     // corners
 , 1, 5, 0, 5, 4,
 , 3, 7, 2, 7, 6,
 , 9, 13, 8, 13, 12,
 , 11, 15, 10, 15, 14,
     // edges
 , 2, 6, 1, 6, 5,
 , 5, 9, 4, 9, 8,
 , 7, 11, 6, 11, 10,
 , 10, 14, 9, 14, 13,
     // center
     // we place this at the end so that we can ignore these indices when rendering stroke-only
 , 6, 10, 5, 10, 9
 };
 GrIndexBuffer* GrOvalRenderer::rRectIndexBuffer(GrGpu* gpu) {
     if (NULL == fRRectIndexBuffer) {
         fRRectIndexBuffer =
         gpu->createIndexBuffer(sizeof(gRRectIndices), false);
         if (NULL != fRRectIndexBuffer) {
 #ifdef SK_DEBUG
             bool updated =
 #endif
             fRRectIndexBuffer->updateData(gRRectIndices,
                                           sizeof(gRRectIndices));
             GR_DEBUGASSERT(updated);
         }
     }
     return fRRectIndexBuffer;
 }
 bool GrOvalRenderer::drawSimpleRRect(GrDrawTarget* target, GrContext* context, bool useAA,
                                      const SkRRect& rrect, const SkStrokeRec& stroke)
 {
     bool useCoverageAA = useAA &&
         !target->getDrawState().getRenderTarget()->isMultisampled() &&
         !target->shouldDisableCoverageAAForBlend();
     // only anti-aliased rrects for now
     if (!useCoverageAA) {
         return false;
     }
     const SkMatrix& vm = context->getMatrix();
 #ifdef SK_DEBUG
     {
         // we should have checked for this previously
         SkASSERT(useCoverageAA && vm.rectStaysRect() && rrect.isSimple());
     }
 #endif
     // do any matrix crunching before we reset the draw state for device coords
     const SkRect& rrectBounds = rrect.getBounds();
     SkRect bounds;
     vm.mapRect(&bounds, rrectBounds);
     SkVector radii = rrect.getSimpleRadii();
     SkScalar xRadius = SkScalarAbs(vm[SkMatrix::kMScaleX]*radii.fX +
                                    vm[SkMatrix::kMSkewY]*radii.fY);
     SkScalar yRadius = SkScalarAbs(vm[SkMatrix::kMSkewX]*radii.fX +
                                    vm[SkMatrix::kMScaleY]*radii.fY);
     // if hairline stroke is greater than radius, we don't handle that right now
     SkStrokeRec::Style style = stroke.getStyle();
     if (SkStrokeRec::kHairline_Style == style &&
         (SK_ScalarHalf > xRadius || SK_ScalarHalf > yRadius)) {
         return false;
     }
     // do (potentially) anisotropic mapping of stroke
     SkVector scaledStroke;
     SkScalar strokeWidth = stroke.getWidth();
     scaledStroke.fX = SkScalarAbs(strokeWidth*(vm[SkMatrix::kMScaleX] + vm[SkMatrix::kMSkewY]));
     scaledStroke.fY = SkScalarAbs(strokeWidth*(vm[SkMatrix::kMSkewX] + vm[SkMatrix::kMScaleY]));
     // if half of strokewidth is greater than radius, we don't handle that right now
     if (SK_ScalarHalf*scaledStroke.fX > xRadius || SK_ScalarHalf*scaledStroke.fY > yRadius) {
         return false;
     }
     // reset to device coordinates
     GrDrawState* drawState = target->drawState();
     GrDrawState::AutoViewMatrixRestore avmr;
     if (!avmr.setIdentity(drawState)) {
         return false;
     }
     bool isStroked = (SkStrokeRec::kStroke_Style == style || SkStrokeRec::kHairline_Style == style);
     GrIndexBuffer* indexBuffer = this->rRectIndexBuffer(context->getGpu());
     if (NULL == indexBuffer) {
         GrPrintf("Failed to create index buffer!\n");
         return false;
     }
     // if the corners are circles, use the circle renderer
     if ((!isStroked || scaledStroke.fX == scaledStroke.fY) && xRadius == yRadius) {
         drawState->setVertexAttribs<gCircleVertexAttribs>(SK_ARRAY_COUNT(gCircleVertexAttribs));
         SkASSERT(sizeof(CircleVertex) == drawState->getVertexSize());
         GrDrawTarget::AutoReleaseGeometry geo(target, 16, 0);
         if (!geo.succeeded()) {
             GrPrintf("Failed to get space for vertices!\n");
             return false;
         }
         CircleVertex* verts = reinterpret_cast<CircleVertex*>(geo.vertices());
         SkScalar innerRadius = 0.0f;
         SkScalar outerRadius = xRadius;
         SkScalar halfWidth = 0;
         if (style != SkStrokeRec::kFill_Style) {
             if (SkScalarNearlyZero(scaledStroke.fX)) {
                 halfWidth = SK_ScalarHalf;
             } else {
                 halfWidth = SkScalarHalf(scaledStroke.fX);
             }
             if (isStroked) {
                 innerRadius = xRadius - halfWidth;
             }
             outerRadius += halfWidth;
             bounds.outset(halfWidth, halfWidth);
         }
         isStroked = (isStroked && innerRadius >= 0);
         GrEffectRef* effect = CircleEdgeEffect::Create(isStroked);
         static const int kCircleEdgeAttrIndex = 1;
         drawState->addCoverageEffect(effect, kCircleEdgeAttrIndex)->unref();
         // The radii are outset for two reasons. First, it allows the shader to simply perform
         // clamp(distance-to-center - radius, 0, 1). Second, the outer radius is used to compute the
         // verts of the bounding box that is rendered and the outset ensures the box will cover all
         // pixels partially covered by the circle.
         outerRadius += SK_ScalarHalf;
         innerRadius -= SK_ScalarHalf;
         // Expand the rect so all the pixels will be captured.
         bounds.outset(SK_ScalarHalf, SK_ScalarHalf);
         SkScalar yCoords[4] = {
             bounds.fTop,
             bounds.fTop + outerRadius,
             bounds.fBottom - outerRadius,
             bounds.fBottom
         };
         SkScalar yOuterRadii[4] = {
             -outerRadius,
 ,
 ,
             outerRadius
         };
         for (int i = 0; i < 4; ++i) {
             verts->fPos = SkPoint::Make(bounds.fLeft, yCoords[i]);
             verts->fOffset = SkPoint::Make(-outerRadius, yOuterRadii[i]);
             verts->fOuterRadius = outerRadius;
             verts->fInnerRadius = innerRadius;
             verts++;
             verts->fPos = SkPoint::Make(bounds.fLeft + outerRadius, yCoords[i]);
             verts->fOffset = SkPoint::Make(0, yOuterRadii[i]);
             verts->fOuterRadius = outerRadius;
             verts->fInnerRadius = innerRadius;
             verts++;
             verts->fPos = SkPoint::Make(bounds.fRight - outerRadius, yCoords[i]);
             verts->fOffset = SkPoint::Make(0, yOuterRadii[i]);
             verts->fOuterRadius = outerRadius;
             verts->fInnerRadius = innerRadius;
             verts++;
             verts->fPos = SkPoint::Make(bounds.fRight, yCoords[i]);
             verts->fOffset = SkPoint::Make(outerRadius, yOuterRadii[i]);
             verts->fOuterRadius = outerRadius;
             verts->fInnerRadius = innerRadius;
             verts++;
         }
         // drop out the middle quad if we're stroked
         int indexCnt = isStroked ? GR_ARRAY_COUNT(gRRectIndices)-6 : GR_ARRAY_COUNT(gRRectIndices);
         target->setIndexSourceToBuffer(indexBuffer);
         target->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 16, indexCnt, &bounds);
     // otherwise we use the ellipse renderer
     } else {
         drawState->setVertexAttribs<gEllipseVertexAttribs>(SK_ARRAY_COUNT(gEllipseVertexAttribs));
         SkASSERT(sizeof(EllipseVertex) == drawState->getVertexSize());
         SkScalar innerXRadius = 0.0f;
         SkScalar innerYRadius = 0.0f;
         if (SkStrokeRec::kFill_Style != style) {
             if (SkScalarNearlyZero(scaledStroke.length())) {
                 scaledStroke.set(SK_ScalarHalf, SK_ScalarHalf);
             } else {
                 scaledStroke.scale(SK_ScalarHalf);
             }
             // we only handle thick strokes for near-circular ellipses
             if (scaledStroke.length() > SK_ScalarHalf &&
                 (SK_ScalarHalf*xRadius > yRadius || SK_ScalarHalf*yRadius > xRadius)) {
                 return false;
             }
             // we don't handle it if curvature of the stroke is less than curvature of the ellipse
             if (scaledStroke.fX*(yRadius*yRadius) < (scaledStroke.fY*scaledStroke.fY)*xRadius ||
                 scaledStroke.fY*(xRadius*xRadius) < (scaledStroke.fX*scaledStroke.fX)*yRadius) {
                 return false;
             }
             // this is legit only if scale & translation (which should be the case at the moment)
             if (isStroked) {
                 innerXRadius = xRadius - scaledStroke.fX;
                 innerYRadius = yRadius - scaledStroke.fY;
             }
             xRadius += scaledStroke.fX;
             yRadius += scaledStroke.fY;
             bounds.outset(scaledStroke.fX, scaledStroke.fY);
         }
         isStroked = (isStroked && innerXRadius >= 0 && innerYRadius >= 0);
         GrDrawTarget::AutoReleaseGeometry geo(target, 16, 0);
         if (!geo.succeeded()) {
             GrPrintf("Failed to get space for vertices!\n");
             return false;
         }
         EllipseVertex* verts = reinterpret_cast<EllipseVertex*>(geo.vertices());
         GrEffectRef* effect = EllipseEdgeEffect::Create(isStroked);
         static const int kEllipseOffsetAttrIndex = 1;
         static const int kEllipseRadiiAttrIndex = 2;
         drawState->addCoverageEffect(effect,
                                      kEllipseOffsetAttrIndex, kEllipseRadiiAttrIndex)->unref();
         // Compute the reciprocals of the radii here to save time in the shader
         SkScalar xRadRecip = SkScalarInvert(xRadius);
         SkScalar yRadRecip = SkScalarInvert(yRadius);
         SkScalar xInnerRadRecip = SkScalarInvert(innerXRadius);
         SkScalar yInnerRadRecip = SkScalarInvert(innerYRadius);
         // Extend the radii out half a pixel to antialias.
         SkScalar xOuterRadius = xRadius + SK_ScalarHalf;
         SkScalar yOuterRadius = yRadius + SK_ScalarHalf;
         // Expand the rect so all the pixels will be captured.
         bounds.outset(SK_ScalarHalf, SK_ScalarHalf);
         SkScalar yCoords[4] = {
             bounds.fTop,
             bounds.fTop + yOuterRadius,
             bounds.fBottom - yOuterRadius,
             bounds.fBottom
         };
         SkScalar yOuterOffsets[4] = {
             yOuterRadius,
             SK_ScalarNearlyZero, // we're using inversesqrt() in the shader, so can't be exactly 0
             SK_ScalarNearlyZero,
             yOuterRadius
         };
         for (int i = 0; i < 4; ++i) {
             verts->fPos = SkPoint::Make(bounds.fLeft, yCoords[i]);
             verts->fOffset = SkPoint::Make(xOuterRadius, yOuterOffsets[i]);
             verts->fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
             verts->fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
             verts++;
             verts->fPos = SkPoint::Make(bounds.fLeft + xOuterRadius, yCoords[i]);
             verts->fOffset = SkPoint::Make(SK_ScalarNearlyZero, yOuterOffsets[i]);
             verts->fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
             verts->fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
             verts++;
             verts->fPos = SkPoint::Make(bounds.fRight - xOuterRadius, yCoords[i]);
             verts->fOffset = SkPoint::Make(SK_ScalarNearlyZero, yOuterOffsets[i]);
             verts->fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
             verts->fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
             verts++;
             verts->fPos = SkPoint::Make(bounds.fRight, yCoords[i]);
             verts->fOffset = SkPoint::Make(xOuterRadius, yOuterOffsets[i]);
             verts->fOuterRadii = SkPoint::Make(xRadRecip, yRadRecip);
             verts->fInnerRadii = SkPoint::Make(xInnerRadRecip, yInnerRadRecip);
             verts++;
         }
         // drop out the middle quad if we're stroked
         int indexCnt = isStroked ? GR_ARRAY_COUNT(gRRectIndices)-6 : GR_ARRAY_COUNT(gRRectIndices);
         target->setIndexSourceToBuffer(indexBuffer);
         target->drawIndexed(kTriangles_GrPrimitiveType, 0, 0, 16, indexCnt, &bounds);
     }
     return true;
 }

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gfx/skia/trunk/src/gpu/GrOvalRenderer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/GrOvalRenderer.cpp