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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 GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint) const SK_OVERRIDE;
SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); }
SkScalar getStartRadius() const { return fRadius1; }
SkScalar getDiffRadius() const { return fRadius2 - fRadius1; }
SK_DEVELOPER_TO_STRING()
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;
};
#endif
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