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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGradientEffects_DEFINED
#define GrGradientEffects_DEFINED
#include "GrCustomStage.h"
#include "GrTypes.h"
#include "GrScalar.h"
class GrGLRadialGradient;
class GrRadialGradient : public GrCustomStage {
public:
GrRadialGradient();
virtual ~GrRadialGradient();
static const char* Name() { return "Radial Gradient"; }
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
typedef GrGLRadialGradient GLProgramStage;
private:
typedef GrCustomStage INHERITED;
};
class GrGLRadial2Gradient;
class GrRadial2Gradient : public GrCustomStage {
public:
GrRadial2Gradient(GrScalar center, GrScalar radius, bool posRoot);
virtual ~GrRadial2Gradient();
static const char* Name() { return "Two-Point Radial Gradient"; }
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
// The radial gradient parameters can collapse to a linear (instead
// of quadratic) equation.
bool isDegenerate() const { return GR_Scalar1 == fCenterX1; }
GrScalar center() const { return fCenterX1; }
GrScalar radius() const { return fRadius0; }
bool isPosRoot() const { return SkToBool(fPosRoot); }
typedef GrGLRadial2Gradient GLProgramStage;
private:
// @{
// Cache of values - these can change arbitrarily, EXCEPT
// we shouldn't change between degenerate and non-degenerate?!
GrScalar fCenterX1;
GrScalar fRadius0;
SkBool8 fPosRoot;
// @}
typedef GrCustomStage INHERITED;
};
class GrGLSweepGradient;
class GrSweepGradient : public GrCustomStage {
public:
GrSweepGradient();
virtual ~GrSweepGradient();
static const char* Name() { return "Sweep Gradient"; }
virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE;
virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE;
typedef GrGLSweepGradient GLProgramStage;
protected:
typedef GrCustomStage INHERITED;
};
#endif
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