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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrEllipseEdgeEffect_DEFINED
#define GrEllipseEdgeEffect_DEFINED
#include "GrEffect.h"
class GrGLEllipseEdgeEffect;
/**
* The output of this effect is a modulation of the input color and coverage for an axis-aligned
* ellipse, specified as center_x, center_y, x_radius, x_radius/y_radius in window space (y-down).
*/
class GrEllipseEdgeEffect : public GrEffect {
public:
static GrEffectRef* Create(bool stroke) {
// we go through this so we only have one copy of each effect (stroked/filled)
static SkAutoTUnref<GrEffectRef> gEllipseStrokeEdgeEffectRef(
CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrEllipseEdgeEffect, (true)))));
static SkAutoTUnref<GrEffectRef> gEllipseFillEdgeEffectRef(
CreateEffectRef(AutoEffectUnref(SkNEW_ARGS(GrEllipseEdgeEffect, (false)))));
if (stroke) {
gEllipseStrokeEdgeEffectRef.get()->ref();
return gEllipseStrokeEdgeEffectRef;
} else {
gEllipseFillEdgeEffectRef.get()->ref();
return gEllipseFillEdgeEffectRef;
}
}
virtual ~GrEllipseEdgeEffect() {}
static const char* Name() { return "EllipseEdge"; }
virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
typedef GrGLEllipseEdgeEffect GLEffect;
virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
inline bool isStroked() const { return fStroke; }
private:
GrEllipseEdgeEffect(bool stroke);
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE {
return true;
}
bool fStroke;
GR_DECLARE_EFFECT_TEST;
typedef GrEffect INHERITED;
};
#endif
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