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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 SkTwoPointRadialGradient_DEFINED
#define SkTwoPointRadialGradient_DEFINED
#include "SkGradientShaderPriv.h"
class SkTwoPointRadialGradient : public SkGradientShaderBase {
public:
SkTwoPointRadialGradient(const SkPoint& start, SkScalar startRadius,
const SkPoint& end, SkScalar endRadius,
const SkColor colors[], const SkScalar pos[],
int colorCount, SkShader::TileMode mode,
SkUnitMapper* mapper);
virtual BitmapType asABitmap(SkBitmap* bitmap,
SkMatrix* matrix,
TileMode* xy) const SK_OVERRIDE;
virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
virtual GrCustomStage* asNewCustomStage(GrContext* context,
GrSamplerState* sampler) const SK_OVERRIDE;
virtual void shadeSpan(int x, int y, SkPMColor* dstCParam,
int count) SK_OVERRIDE;
virtual bool setContext(const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix) SK_OVERRIDE;
SkScalar getCenterX1() const { return fDiff.length(); }
SkScalar getStartRadius() const { return fStartRadius; }
SkScalar getDiffRadius() const { return fDiffRadius; }
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointRadialGradient)
protected:
SkTwoPointRadialGradient(SkFlattenableReadBuffer& buffer);
virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE;
private:
typedef SkGradientShaderBase INHERITED;
const SkPoint fCenter1;
const SkPoint fCenter2;
const SkScalar fRadius1;
const SkScalar fRadius2;
SkPoint fDiff;
SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA;
void init();
};
///////////////////////////////////////////////////////////////////////////////
class GrGLRadial2Gradient;
class GrRadial2Gradient : public GrGradientEffect {
public:
GrRadial2Gradient(GrTexture* texture, GrScalar center, GrScalar radius, bool posRoot);
GrRadial2Gradient(GrContext* ctx, const SkTwoPointRadialGradient& shader,
GrSamplerState* sampler);
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 GrGradientEffect INHERITED;
};
#endif
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