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 "SkMatrixPriv.h" 15 #include "SkNx.h" 16 #include "SkShaderBase.h" 17 #include "SkTArray.h" 18 19 struct Sk4fGradientInterval { 20 Sk4fGradientInterval(const Sk4f& c0, SkScalar t0, 21 const Sk4f& c1, SkScalar t1); 22 containsSk4fGradientInterval23 bool contains(SkScalar t) const { 24 // True if t is in [p0,p1]. Note: this helper assumes a 25 // natural/increasing interval - so it's not usable in Sk4fLinearGradient. 26 SkASSERT(fT0 < fT1); 27 return t >= fT0 && t <= fT1; 28 } 29 30 // Color bias and color gradient, such that for a t in this interval 31 // 32 // C = fCb + t * fCg; 33 SkPMColor4f fCb, fCg; 34 SkScalar fT0, fT1; 35 }; 36 37 class Sk4fGradientIntervalBuffer { 38 public: 39 void init(const SkGradientShaderBase&, SkColorSpace* dstCS, SkShader::TileMode tileMode, 40 bool premulColors, SkScalar alpha, bool reverse); 41 42 const Sk4fGradientInterval* find(SkScalar t) const; 43 const Sk4fGradientInterval* findNext(SkScalar t, const Sk4fGradientInterval* prev, 44 bool increasing) const; 45 46 using BufferType = SkSTArray<8, Sk4fGradientInterval, true>; 47 48 const BufferType* operator->() const { return &fIntervals; } 49 50 private: 51 BufferType fIntervals; 52 }; 53 54 class SkGradientShaderBase:: 55 GradientShaderBase4fContext : public Context { 56 public: 57 GradientShaderBase4fContext(const SkGradientShaderBase&, 58 const ContextRec&); 59 getFlags()60 uint32_t getFlags() const override { return fFlags; } 61 62 bool isValid() const; 63 64 protected: 65 Sk4fGradientIntervalBuffer fIntervals; 66 SkMatrix fDstToPos; 67 SkMatrixPriv::MapXYProc fDstToPosProc; 68 uint8_t fFlags; 69 bool fColorsArePremul; 70 bool fDither; 71 72 private: 73 using INHERITED = Context; 74 75 void addMirrorIntervals(const SkGradientShaderBase&, 76 const Sk4f& componentScale, bool reverse); 77 }; 78 79 #endif // Sk4fGradientBase_DEFINED 80