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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"
// TODO(dominikg): Worth making it truly immutable (i.e. set values in constructor)?
// Should only be initialized once via init(). Immutable afterwards.
struct TwoPtRadial {
enum {
kDontDrawT = 0x80000000
};
float fCenterX, fCenterY;
float fDCenterX, fDCenterY;
float fRadius;
float fDRadius;
float fA;
float fRadius2;
float fRDR;
bool fFlipped;
void init(const SkPoint& center0, SkScalar rad0,
const SkPoint& center1, SkScalar rad1,
bool flipped);
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,
bool flippedGrad, const Descriptor&,
const SkMatrix* localMatrix);
virtual size_t contextSize() const SK_OVERRIDE;
class TwoPointConicalGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
public:
TwoPointConicalGradientContext(const SkTwoPointConicalGradient&, const ContextRec&);
~TwoPointConicalGradientContext() {}
virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
private:
typedef SkGradientShaderBase::GradientShaderBaseContext INHERITED;
};
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;
virtual bool isOpaque() const SK_OVERRIDE;
SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); }
SkScalar getStartRadius() const { return fRadius1; }
SkScalar getDiffRadius() const { return fRadius2 - fRadius1; }
const SkPoint& getStartCenter() const { return fCenter1; }
const SkPoint& getEndCenter() const { return fCenter2; }
SkScalar getEndRadius() const { return fRadius2; }
bool isFlippedGrad() const { return fFlippedGrad; }
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient)
protected:
SkTwoPointConicalGradient(SkReadBuffer& buffer);
virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE;
virtual Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
private:
SkPoint fCenter1;
SkPoint fCenter2;
SkScalar fRadius1;
SkScalar fRadius2;
bool fFlippedGrad;
typedef SkGradientShaderBase INHERITED;
};
#endif
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