1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef Sk4fGradientBase_DEFINED 9 #define Sk4fGradientBase_DEFINED 10 11 #include "Sk4fGradientPriv.h" 12 #include "SkColor.h" 13 #include "SkGradientShaderPriv.h" 14 #include "SkMatrix.h" 15 #include "SkNx.h" 16 #include "SkPM4f.h" 17 #include "SkShaderBase.h" 18 #include "SkTArray.h" 19 20 struct Sk4fGradientInterval { 21 Sk4fGradientInterval(const Sk4f& c0, SkScalar t0, 22 const Sk4f& c1, SkScalar t1); 23 containsSk4fGradientInterval24 bool contains(SkScalar t) const { 25 // True if t is in [p0,p1]. Note: this helper assumes a 26 // natural/increasing interval - so it's not usable in Sk4fLinearGradient. 27 SkASSERT(fT0 < fT1); 28 return t >= fT0 && t <= fT1; 29 } 30 31 // Color bias and color gradient, such that for a t in this interval 32 // 33 // C = fCb + t * fCg; 34 SkPM4f fCb, fCg; 35 SkScalar fT0, fT1; 36 }; 37 38 class Sk4fGradientIntervalBuffer { 39 public: 40 void init(const SkGradientShaderBase&, SkColorSpace* dstCS, SkShader::TileMode tileMode, 41 bool premulColors, SkScalar alpha, bool reverse); 42 43 const Sk4fGradientInterval* find(SkScalar t) const; 44 const Sk4fGradientInterval* findNext(SkScalar t, const Sk4fGradientInterval* prev, 45 bool increasing) const; 46 47 using BufferType = SkSTArray<8, Sk4fGradientInterval, true>; 48 49 const BufferType* operator->() const { return &fIntervals; } 50 51 private: 52 BufferType fIntervals; 53 }; 54 55 class SkGradientShaderBase:: 56 GradientShaderBase4fContext : public Context { 57 public: 58 GradientShaderBase4fContext(const SkGradientShaderBase&, 59 const ContextRec&); 60 getFlags()61 uint32_t getFlags() const override { return fFlags; } 62 63 void shadeSpan(int x, int y, SkPMColor dst[], int count) final; 64 65 bool isValid() const; 66 67 protected: 68 Sk4fGradientIntervalBuffer fIntervals; 69 SkMatrix fDstToPos; 70 SkMatrix::MapXYProc fDstToPosProc; 71 uint8_t fFlags; 72 bool fColorsArePremul; 73 74 private: 75 using INHERITED = Context; 76 77 void addMirrorIntervals(const SkGradientShaderBase&, 78 const Sk4f& componentScale, bool reverse); 79 }; 80 81 #endif // Sk4fGradientBase_DEFINED 82