| /* |
| * 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 "GrTBackendEffectFactory.h" |
| |
| #include "GrDrawState.h" |
| #include "GrDrawTarget.h" |
| #include "GrGpu.h" |
| |
| #include "SkRRect.h" |
| #include "SkStrokeRec.h" |
| |
| SK_DEFINE_INST_COUNT(GrOvalRenderer) |
| |
| namespace { |
| |
| struct CircleVertex { |
| GrPoint fPos; |
| GrPoint fOffset; |
| SkScalar fOuterRadius; |
| SkScalar fInnerRadius; |
| }; |
| |
| struct EllipseVertex { |
| GrPoint fPos; |
| GrPoint fOffset; |
| GrPoint fOuterRadii; |
| GrPoint fInnerRadii; |
| }; |
| |
| 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 GrEffect { |
| 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 GrGLEffect { |
| public: |
| GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) |
| : INHERITED (factory) {} |
| |
| virtual void emitCode(GrGLShaderBuilder* builder, |
| const GrDrawEffect& drawEffect, |
| EffectKey key, |
| const char* outputColor, |
| const char* inputColor, |
| const TextureSamplerArray& samplers) SK_OVERRIDE { |
| GrGLShaderBuilder::VertexBuilder* vertexBuilder = builder->getVertexBuilder(); |
| SkASSERT(NULL != vertexBuilder); |
| |
| const CircleEdgeEffect& circleEffect = drawEffect.castEffect<CircleEdgeEffect>(); |
| const char *vsName, *fsName; |
| vertexBuilder->addVarying(kVec4f_GrSLType, "CircleEdge", &vsName, &fsName); |
| |
| const SkString* attrName = |
| vertexBuilder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]); |
| vertexBuilder->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"); |
| } |
| |
| SkString modulate; |
| GrGLSLModulatef<4>(&modulate, inputColor, "edgeAlpha"); |
| builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.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 GrGLEffect INHERITED; |
| }; |
| |
| |
| private: |
| CircleEdgeEffect(bool stroke) : GrEffect() { |
| 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 GrEffect INHERITED; |
| }; |
| |
| GR_DEFINE_EFFECT_TEST(CircleEdgeEffect); |
| |
| GrEffectRef* CircleEdgeEffect::TestCreate(SkMWCRandom* 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 GrEffect { |
| 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 GrGLEffect { |
| public: |
| GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) |
| : INHERITED (factory) {} |
| |
| virtual void emitCode(GrGLShaderBuilder* builder, |
| const GrDrawEffect& drawEffect, |
| EffectKey key, |
| const char* outputColor, |
| const char* inputColor, |
| const TextureSamplerArray& samplers) SK_OVERRIDE { |
| GrGLShaderBuilder::VertexBuilder* vertexBuilder = builder->getVertexBuilder(); |
| SkASSERT(NULL != vertexBuilder); |
| |
| const EllipseEdgeEffect& ellipseEffect = drawEffect.castEffect<EllipseEdgeEffect>(); |
| |
| const char *vsOffsetName, *fsOffsetName; |
| const char *vsRadiiName, *fsRadiiName; |
| |
| vertexBuilder->addVarying(kVec2f_GrSLType, "EllipseOffsets", &vsOffsetName, &fsOffsetName); |
| const SkString* attr0Name = |
| vertexBuilder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]); |
| vertexBuilder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName, attr0Name->c_str()); |
| |
| vertexBuilder->addVarying(kVec4f_GrSLType, "EllipseRadii", &vsRadiiName, &fsRadiiName); |
| const SkString* attr1Name = |
| vertexBuilder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[1]); |
| vertexBuilder->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"); |
| } |
| |
| SkString modulate; |
| GrGLSLModulatef<4>(&modulate, inputColor, "edgeAlpha"); |
| builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.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 GrGLEffect INHERITED; |
| }; |
| |
| private: |
| EllipseEdgeEffect(bool stroke) : GrEffect() { |
| 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 GrEffect INHERITED; |
| }; |
| |
| GR_DEFINE_EFFECT_TEST(EllipseEdgeEffect); |
| |
| GrEffectRef* EllipseEdgeEffect::TestCreate(SkMWCRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture* textures[]) { |
| return EllipseEdgeEffect::Create(random->nextBool()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void GrOvalRenderer::reset() { |
| GrSafeSetNull(fRRectIndexBuffer); |
| } |
| |
| bool GrOvalRenderer::drawOval(GrDrawTarget* target, const GrContext* context, bool useAA, |
| const SkRect& oval, const SkStrokeRec& stroke) |
| { |
| if (!useAA) { |
| return false; |
| } |
| |
| const SkMatrix& vm = context->getMatrix(); |
| |
| // we can draw circles |
| if (SkScalarNearlyEqual(oval.width(), oval.height()) |
| && circle_stays_circle(vm)) { |
| this->drawCircle(target, useAA, oval, stroke); |
| |
| // and axis-aligned ellipses only |
| } else if (vm.rectStaysRect()) { |
| return this->drawEllipse(target, useAA, oval, stroke); |
| |
| } else { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| namespace { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // position + edge |
| extern const GrVertexAttrib gCircleVertexAttribs[] = { |
| {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, |
| {kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding} |
| }; |
| |
| }; |
| |
| void GrOvalRenderer::drawCircle(GrDrawTarget* target, |
| bool useAA, |
| 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(¢er, 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); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| |
| // position + edge |
| extern const GrVertexAttrib gEllipseVertexAttribs[] = { |
| {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding}, |
| {kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}, |
| {kVec4f_GrVertexAttribType, 2*sizeof(GrPoint), kEffect_GrVertexAttribBinding} |
| }; |
| |
| }; |
| |
| bool GrOvalRenderer::drawEllipse(GrDrawTarget* target, |
| bool useAA, |
| 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(useAA && 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(¢er, 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 = 0.0f; |
| 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; |
| } |
| |
| 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; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static const uint16_t gRRectIndices[] = { |
| // corners |
| 0, 1, 5, 0, 5, 4, |
| 2, 3, 7, 2, 7, 6, |
| 8, 9, 13, 8, 13, 12, |
| 10, 11, 15, 10, 15, 14, |
| |
| // edges |
| 1, 2, 6, 1, 6, 5, |
| 4, 5, 9, 4, 9, 8, |
| 6, 7, 11, 6, 11, 10, |
| 9, 10, 14, 9, 14, 13, |
| |
| // center |
| // we place this at the end so that we can ignore these indices when rendering stroke-only |
| 5, 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) |
| { |
| // only anti-aliased rrects for now |
| if (!useAA) { |
| return false; |
| } |
| |
| const SkMatrix& vm = context->getMatrix(); |
| #ifdef SK_DEBUG |
| { |
| // we should have checked for this previously |
| SkASSERT(useAA && 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, |
| 0, |
| 0, |
| 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; |
| } |
