1 2 /* 3 * Copyright 2012 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 #ifndef SkTwoPointConicalGradient_DEFINED 10 #define SkTwoPointConicalGradient_DEFINED 11 12 #include "SkGradientShaderPriv.h" 13 14 struct TwoPtRadial { 15 enum { 16 kDontDrawT = 0x80000000 17 }; 18 19 float fCenterX, fCenterY; 20 float fDCenterX, fDCenterY; 21 float fRadius; 22 float fDRadius; 23 float fA; 24 float fRadius2; 25 float fRDR; 26 27 void init(const SkPoint& center0, SkScalar rad0, 28 const SkPoint& center1, SkScalar rad1); 29 30 // used by setup and nextT 31 float fRelX, fRelY, fIncX, fIncY; 32 float fB, fDB; 33 34 void setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy); 35 SkFixed nextT(); 36 37 static bool DontDrawT(SkFixed t) { 38 return kDontDrawT == (uint32_t)t; 39 } 40 }; 41 42 43 class SkTwoPointConicalGradient : public SkGradientShaderBase { 44 TwoPtRadial fRec; 45 void init(); 46 47 public: 48 SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius, 49 const SkPoint& end, SkScalar endRadius, 50 const SkColor colors[], const SkScalar pos[], 51 int colorCount, SkShader::TileMode mode, 52 SkUnitMapper* mapper); 53 54 virtual void shadeSpan(int x, int y, SkPMColor* dstCParam, 55 int count) SK_OVERRIDE; 56 virtual bool setContext(const SkBitmap& device, 57 const SkPaint& paint, 58 const SkMatrix& matrix) SK_OVERRIDE; 59 60 virtual BitmapType asABitmap(SkBitmap* bitmap, 61 SkMatrix* matrix, 62 TileMode* xy) const; 63 virtual SkShader::GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE; 64 virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint& paint) const SK_OVERRIDE; 65 66 SkScalar getCenterX1() const { return SkPoint::Distance(fCenter1, fCenter2); } 67 SkScalar getStartRadius() const { return fRadius1; } 68 SkScalar getDiffRadius() const { return fRadius2 - fRadius1; } 69 70 SK_DEVELOPER_TO_STRING() 71 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTwoPointConicalGradient) 72 73 protected: 74 SkTwoPointConicalGradient(SkFlattenableReadBuffer& buffer); 75 virtual void flatten(SkFlattenableWriteBuffer& buffer) const SK_OVERRIDE; 76 77 private: 78 typedef SkGradientShaderBase INHERITED; 79 const SkPoint fCenter1; 80 const SkPoint fCenter2; 81 const SkScalar fRadius1; 82 const SkScalar fRadius2; 83 }; 84 85 #endif 86
