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Unified Diff: src/gpu/effects/GrRRectEffect.cpp

Issue 175423002: Add effect-based clipping for circular "tab" style rrects. (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: fix gcc warnings Created 6 years, 10 months ago
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Index: src/gpu/effects/GrRRectEffect.cpp
diff --git a/src/gpu/effects/GrRRectEffect.cpp b/src/gpu/effects/GrRRectEffect.cpp
index 3b7cecaff0461a0e34182190146182c4c9903718..7a6554b88f21f2c0d8a17065e2063fd253debc79 100644
--- a/src/gpu/effects/GrRRectEffect.cpp
+++ b/src/gpu/effects/GrRRectEffect.cpp
@@ -17,17 +17,27 @@ class GLRRectEffect;
class RRectEffect : public GrEffect {
public:
- // This effect only supports circular corner rrects where all corners have the same radius
- // which must be <= kRadiusMin.
+ // This effect only supports circular corner rrects where the radius is >= kRadiusMin.
static const SkScalar kRadiusMin;
- static GrEffectRef* Create(const SkRRect&);
+ /// The types of circular corner rrects supported
+ enum Type {
+ kCircleCorner_Type, //<! All four corners have the same circular radius.
+ kLeftCircleTab_Type, //<! The left side has circular corners and the right is a rect.
+ kTopCircleTab_Type, //<! etc
+ kRightCircleTab_Type,
+ kBottomCircleTab_Type,
+ };
+
+ static GrEffectRef* Create(const SkRRect&, Type);
virtual ~RRectEffect() {};
static const char* Name() { return "RRect"; }
const SkRRect& getRRect() const { return fRRect; }
+ Type getType() const { return fType; }
+
typedef GLRRectEffect GLEffect;
virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
@@ -35,11 +45,12 @@ public:
virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
private:
- RRectEffect(const SkRRect&);
+ RRectEffect(const SkRRect&, Type);
virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE;
SkRRect fRRect;
+ Type fType;
GR_DECLARE_EFFECT_TEST;
@@ -48,8 +59,8 @@ private:
const SkScalar RRectEffect::kRadiusMin = 0.5f;
-GrEffectRef* RRectEffect::Create(const SkRRect& rrect) {
- return CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(RRectEffect, (rrect))));
+GrEffectRef* RRectEffect::Create(const SkRRect& rrect, Type type) {
+ return CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(RRectEffect, (rrect, type))));
}
void RRectEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
@@ -60,13 +71,15 @@ const GrBackendEffectFactory& RRectEffect::getFactory() const {
return GrTBackendEffectFactory<RRectEffect>::getInstance();
}
-RRectEffect::RRectEffect(const SkRRect& rrect)
- : fRRect(rrect) {
+RRectEffect::RRectEffect(const SkRRect& rrect, Type type)
+ : fRRect(rrect)
+ , fType(type) {
this->setWillReadFragmentPosition();
}
bool RRectEffect::onIsEqual(const GrEffect& other) const {
const RRectEffect& rre = CastEffect<RRectEffect>(other);
+ // type is derived from fRRect, so no need to check it.
return fRRect == rre.fRRect;
}
@@ -101,7 +114,7 @@ public:
const TransformedCoordsArray&,
const TextureSamplerArray&) SK_OVERRIDE;
- static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&) { return 0; }
+ static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
@@ -125,10 +138,13 @@ void GLRRectEffect::emitCode(GrGLShaderBuilder* builder,
const char* inputColor,
const TransformedCoordsArray&,
const TextureSamplerArray& samplers) {
+ const RRectEffect& rre = drawEffect.castEffect<RRectEffect>();
const char *rectName;
const char *radiusPlusHalfName;
// The inner rect is the rrect bounds inset by the radius. Its top, left, right, and bottom
- // edges correspond to components x, y, z, and w, respectively.
+ // edges correspond to components x, y, z, and w, respectively. When one side of the rrect has
+ // rectangular corners, that side's value corresponds to the rect edge's value outset by half a
+ // pixel.
fInnerRectUniform = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kVec4f_GrSLType,
"innerRect",
@@ -149,25 +165,107 @@ void GLRRectEffect::emitCode(GrGLShaderBuilder* builder,
// The code below is a simplified version of the above that performs maxs on the vector
// components before computing distances and alpha values so that only one distance computation
// need be computed to determine the min alpha.
- builder->fsCodeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos);
- builder->fsCodeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName);
- builder->fsCodeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n");
- builder->fsCodeAppendf("\t\tfloat alpha = clamp(%s - length(dxy), 0.0, 1.0);\n",
- radiusPlusHalfName);
+ //
+ // For the cases where one half of the rrect is rectangular we drop one of the x or y
+ // computations, compute a separate rect edge alpha for the rect side, and mul the two computed
+ // alphas together.
+ switch (rre.getType()) {
+ case RRectEffect::kCircleCorner_Type:
+ builder->fsCodeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName);
+ builder->fsCodeAppend("\t\tvec2 dxy = max(max(dxy0, dxy1), 0.0);\n");
+ builder->fsCodeAppendf("\t\tfloat alpha = clamp(%s - length(dxy), 0.0, 1.0);\n",
+ radiusPlusHalfName);
+ break;
+ case RRectEffect::kLeftCircleTab_Type:
+ builder->fsCodeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tfloat dy1 = %s.y - %s.w;\n", fragmentPos, rectName);
+ builder->fsCodeAppend("\t\tvec2 dxy = max(vec2(dxy0.x, max(dxy0.y, dy1)), 0.0);\n");
+ builder->fsCodeAppendf("\t\tfloat rightAlpha = clamp(%s.z - %s.x, 0.0, 1.0);\n",
+ rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tfloat alpha = rightAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n",
+ radiusPlusHalfName);
+ break;
+ case RRectEffect::kTopCircleTab_Type:
+ builder->fsCodeAppendf("\t\tvec2 dxy0 = %s.xy - %s.xy;\n", rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tfloat dx1 = %s.x - %s.z;\n", fragmentPos, rectName);
+ builder->fsCodeAppend("\t\tvec2 dxy = max(vec2(max(dxy0.x, dx1), dxy0.y), 0.0);\n");
+ builder->fsCodeAppendf("\t\tfloat bottomAlpha = clamp(%s.w - %s.y, 0.0, 1.0);\n",
+ rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tfloat alpha = bottomAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n",
+ radiusPlusHalfName);
+ break;
+ case RRectEffect::kRightCircleTab_Type:
+ builder->fsCodeAppendf("\t\tfloat dy0 = %s.y - %s.y;\n", rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName);
+ builder->fsCodeAppend("\t\tvec2 dxy = max(vec2(dxy1.x, max(dy0, dxy1.y)), 0.0);\n");
+ builder->fsCodeAppendf("\t\tfloat leftAlpha = clamp(%s.x - %s.x, 0.0, 1.0);\n",
+ fragmentPos, rectName);
+ builder->fsCodeAppendf("\t\tfloat alpha = leftAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n",
+ radiusPlusHalfName);
+ break;
+ case RRectEffect::kBottomCircleTab_Type:
+ builder->fsCodeAppendf("\t\tfloat dx0 = %s.x - %s.x;\n", rectName, fragmentPos);
+ builder->fsCodeAppendf("\t\tvec2 dxy1 = %s.xy - %s.zw;\n", fragmentPos, rectName);
+ builder->fsCodeAppend("\t\tvec2 dxy = max(vec2(max(dx0, dxy1.x), dxy1.y), 0.0);\n");
+ builder->fsCodeAppendf("\t\tfloat topAlpha = clamp(%s.y - %s.y, 0.0, 1.0);\n",
+ fragmentPos, rectName);
+ builder->fsCodeAppendf("\t\tfloat alpha = topAlpha * clamp(%s - length(dxy), 0.0, 1.0);\n",
+ radiusPlusHalfName);
+ break;
+ }
builder->fsCodeAppendf("\t\t%s = %s;\n", outputColor,
(GrGLSLExpr4(inputColor) * GrGLSLExpr1("alpha")).c_str());
}
+GrGLEffect::EffectKey GLRRectEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
+ const RRectEffect& rre = drawEffect.castEffect<RRectEffect>();
+ return rre.getType();
+}
+
void GLRRectEffect::setData(const GrGLUniformManager& uman, const GrDrawEffect& drawEffect) {
const RRectEffect& rre = drawEffect.castEffect<RRectEffect>();
const SkRRect& rrect = rre.getRRect();
if (rrect != fPrevRRect) {
- SkASSERT(rrect.isSimpleCircular());
SkRect rect = rrect.getBounds();
- SkScalar radius = rrect.getSimpleRadii().fX;
- SkASSERT(radius >= RRectEffect::kRadiusMin);
- rect.inset(radius, radius);
+ SkScalar radius = 0;
+ switch (rre.getType()) {
+ case RRectEffect::kCircleCorner_Type:
+ SkASSERT(rrect.isSimpleCircular());
+ radius = rrect.getSimpleRadii().fX;
+ SkASSERT(radius >= RRectEffect::kRadiusMin);
+ rect.inset(radius, radius);
+ break;
+ case RRectEffect::kLeftCircleTab_Type:
+ radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
+ rect.fLeft += radius;
+ rect.fTop += radius;
+ rect.fRight += 0.5f;
+ rect.fBottom -= radius;
+ break;
+ case RRectEffect::kTopCircleTab_Type:
+ radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
+ rect.fLeft += radius;
+ rect.fTop += radius;
+ rect.fRight -= radius;
+ rect.fBottom += 0.5f;
+ break;
+ case RRectEffect::kRightCircleTab_Type:
+ radius = rrect.radii(SkRRect::kUpperRight_Corner).fX;
+ rect.fLeft -= 0.5f;
+ rect.fTop += radius;
+ rect.fRight -= radius;
+ rect.fBottom -= radius;
+ break;
+ case RRectEffect::kBottomCircleTab_Type:
+ radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX;
+ rect.fLeft += radius;
+ rect.fTop -= 0.5f;
+ rect.fRight -= radius;
+ rect.fBottom -= radius;
+ break;
+ }
uman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
uman.set1f(fRadiusPlusHalfUniform, radius + 0.5f);
fPrevRRect = rrect;
@@ -177,13 +275,61 @@ void GLRRectEffect::setData(const GrGLUniformManager& uman, const GrDrawEffect&
//////////////////////////////////////////////////////////////////////////////
GrEffectRef* GrRRectEffect::Create(const SkRRect& rrect) {
- if (!rrect.isSimpleCircular()) {
+ RRectEffect::Type type;
+ if (rrect.isSimpleCircular()) {
+ if (rrect.getSimpleRadii().fX < RRectEffect::kRadiusMin) {
+ return NULL;
+ }
+ type = RRectEffect::kCircleCorner_Type;
+ } else if (rrect.isComplex()) {
+ // Check for the "tab" cases - two adjacent circular corners and two square corners.
+ SkScalar radius = 0;
+ int circleCornerBitfield = 0;
+ for (int c = 0; c < 4; ++c) {
+ const SkVector& r = rrect.radii((SkRRect::Corner)c);
+ SkASSERT((0 == r.fX) == (0 == r.fY));
+ if (0 == r.fX) {
+ continue;
+ }
+ if (r.fX != r.fY) {
+ return NULL;
+ }
+ if (!circleCornerBitfield) {
+ radius = r.fX;
+ if (radius < RRectEffect::kRadiusMin) {
+ return NULL;
+ }
+ circleCornerBitfield = 1 << c;
+ } else {
+ if (r.fX != radius) {
+ return NULL;
+ }
+ circleCornerBitfield |= 1 << c;
+ }
+ }
+
+ GR_STATIC_ASSERT(SkRRect::kUpperLeft_Corner == 0);
+ GR_STATIC_ASSERT(SkRRect::kUpperRight_Corner == 1);
+ GR_STATIC_ASSERT(SkRRect::kLowerRight_Corner == 2);
+ GR_STATIC_ASSERT(SkRRect::kLowerLeft_Corner == 3);
+ switch (circleCornerBitfield) {
+ case 3:
+ type = RRectEffect::kTopCircleTab_Type;
+ break;
+ case 6:
+ type = RRectEffect::kRightCircleTab_Type;
+ break;
+ case 9:
+ type = RRectEffect::kLeftCircleTab_Type;
+ break;
+ case 12:
+ type = RRectEffect::kBottomCircleTab_Type;
+ break;
+ default:
+ return NULL;
+ }
+ } else {
return NULL;
}
-
- if (rrect.getSimpleRadii().fX < RRectEffect::kRadiusMin) {
- return NULL;
- }
-
- return RRectEffect::Create(rrect);
+ return RRectEffect::Create(rrect, type);
}
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