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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 SkTwoPointConicalGradient_DEFINED
#define SkTwoPointConicalGradient_DEFINED
#include "SkGradientShaderPriv.h"
struct TwoPtRadial {
enum {
kDontDrawT = 0x80000000
};
float fCenterX, fCenterY;
float fDCenterX, fDCenterY;
float fRadius;
float fDRadius;
float fA;
float fRadius2;
float fRDR;
void init(const SkPoint& center0, SkScalar rad0,
const SkPoint& center1, SkScalar rad1);
// used by setup and nextT
float fRelX, fRelY, fIncX, fIncY;
float fB, fDB;
void setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy);
SkFixed nextT();
static bool DontDrawT(SkFixed t) {
return kDontDrawT == (uint32_t)t;
}
};
class SkTwoPointConicalGradient : public SkGradientShaderBase {
TwoPtRadial fRec;
void init();
public:
SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius,
const SkPoint& end, SkScalar endRadius,
const SkColor colors[], const SkScalar pos[],
int colorCount, SkShader::TileMode mode,
SkUnitMapper* mapper);
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;
virtual BitmapType asABitmap(SkBitmap* bitmap,
SkMatrix* matrix,
TileMode* xy) const;
virtual SkShader::GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
virtual GrCustomStage* asNewCustomStage(GrContext* context,
GrSamplerState* sampler) const SK_OVERRIDE;
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient)
protected:
SkTwoPointConicalGradient(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;
};
///////////////////////////////////////////////////////////////////////////////
class GrGLConical2Gradient;
class GrConical2Gradient : public GrGradientEffect {
public:
GrConical2Gradient(GrTexture* texture, GrScalar center, GrScalar radius, GrScalar diffRadius);
GrConical2Gradient(GrContext* ctx, const SkShader& shader,
GrSamplerState* sampler, SkScalar center,
SkScalar radius, SkScalar diffRadius);
virtual ~GrConical2Gradient();
static const char* Name() { return "Two-Point Conical 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 SkScalarAbs(fDiffRadius) == SkScalarAbs(fCenterX1); }
GrScalar center() const { return fCenterX1; }
GrScalar diffRadius() const { return fDiffRadius; }
GrScalar radius() const { return fRadius0; }
typedef GrGLConical2Gradient GLProgramStage;
private:
// @{
// Cache of values - these can change arbitrarily, EXCEPT
// we shouldn't change between degenerate and non-degenerate?!
GrScalar fCenterX1;
GrScalar fRadius0;
GrScalar fDiffRadius;
// @}
typedef GrGradientEffect INHERITED;
};
#endif
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