michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0:  #ifndef SkTwoPointConicalGradient_DEFINED
michael@0:  #define SkTwoPointConicalGradient_DEFINED
michael@0: 
michael@0: #include "SkGradientShaderPriv.h"
michael@0: 
michael@0: struct TwoPtRadial {
michael@0:     enum {
michael@0:         kDontDrawT  = 0x80000000
michael@0:     };
michael@0: 
michael@0:     float   fCenterX, fCenterY;
michael@0:     float   fDCenterX, fDCenterY;
michael@0:     float   fRadius;
michael@0:     float   fDRadius;
michael@0:     float   fA;
michael@0:     float   fRadius2;
michael@0:     float   fRDR;
michael@0: 
michael@0:     void init(const SkPoint& center0, SkScalar rad0,
michael@0:               const SkPoint& center1, SkScalar rad1);
michael@0: 
michael@0:     // used by setup and nextT
michael@0:     float   fRelX, fRelY, fIncX, fIncY;
michael@0:     float   fB, fDB;
michael@0: 
michael@0:     void setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy);
michael@0:     SkFixed nextT();
michael@0: 
michael@0:     static bool DontDrawT(SkFixed t) {
michael@0:         return kDontDrawT == (uint32_t)t;
michael@0:     }
michael@0: };
michael@0: 
michael@0: 
michael@0: class SkTwoPointConicalGradient : public SkGradientShaderBase {
michael@0:     TwoPtRadial fRec;
michael@0:     void init();
michael@0: 
michael@0: public:
michael@0:     SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius,
michael@0:                               const SkPoint& end, SkScalar endRadius,
michael@0:                               const Descriptor&);
michael@0: 
michael@0:     virtual void shadeSpan(int x, int y, SkPMColor* dstCParam,
michael@0:                            int count) SK_OVERRIDE;
michael@0:     virtual bool setContext(const SkBitmap& device,
michael@0:                             const SkPaint& paint,
michael@0:                             const SkMatrix& matrix) SK_OVERRIDE;
michael@0: 
michael@0:     virtual BitmapType asABitmap(SkBitmap* bitmap,
michael@0:                                  SkMatrix* matrix,
michael@0:                                  TileMode* xy) const;
michael@0:     virtual SkShader::GradientType asAGradient(GradientInfo* info) const  SK_OVERRIDE;
michael@0:     virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint) const SK_OVERRIDE;
michael@0:     virtual bool isOpaque() const SK_OVERRIDE;
michael@0: 
michael@0:     SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); }
michael@0:     SkScalar getStartRadius() const { return fRadius1; }
michael@0:     SkScalar getDiffRadius() const { return fRadius2 - fRadius1; }
michael@0: 
michael@0:     SK_TO_STRING_OVERRIDE()
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient)
michael@0: 
michael@0: protected:
michael@0:     SkTwoPointConicalGradient(SkReadBuffer& buffer);
michael@0:     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     typedef SkGradientShaderBase INHERITED;
michael@0:     const SkPoint fCenter1;
michael@0:     const SkPoint fCenter2;
michael@0:     const SkScalar fRadius1;
michael@0:     const SkScalar fRadius2;
michael@0: };
michael@0: 
michael@0: #endif