1 2 /* 3 * Copyright 2008 The Android Open Source Project 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 10 #ifndef SkUnitMappers_DEFINED 11 #define SkUnitMappers_DEFINED 12 13 #include "SkUnitMapper.h" 14 15 /** This discretizes the range [0...1) into N discret values. 16 */ 17 class SkDiscreteMapper : public SkUnitMapper { 18 public: 19 SkDiscreteMapper(int segments); 20 // override from SkUnitMapper 21 virtual uint16_t mapUnit16(uint16_t x); 22 23 protected: 24 SkDiscreteMapper(SkFlattenableReadBuffer& ); 25 // overrides from SkFlattenable 26 virtual void flatten(SkFlattenableWriteBuffer& ); 27 virtual Factory getFactory(); 28 private: 29 int fSegments; 30 SkFract fScale; // computed from fSegments 31 32 static SkFlattenable* Create(SkFlattenableReadBuffer& buffer); 33 34 typedef SkUnitMapper INHERITED; 35 }; 36 37 /** This returns cos(x), to simulate lighting a sphere, where 0 maps to the 38 center of the sphere, and 1 maps to the edge. 39 */ 40 class SkCosineMapper : public SkUnitMapper { 41 public: 42 SkCosineMapper() {} 43 // override from SkUnitMapper 44 virtual uint16_t mapUnit16(uint16_t x); 45 46 protected: 47 SkCosineMapper(SkFlattenableReadBuffer&); 48 // overrides from SkFlattenable 49 virtual Factory getFactory(); 50 51 private: 52 static SkFlattenable* Create(SkFlattenableReadBuffer&); 53 54 typedef SkUnitMapper INHERITED; 55 }; 56 57 #endif 58 59
