1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SkUnitMappers_DEFINED 18 #define SkUnitMappers_DEFINED 19 20 #include "SkUnitMapper.h" 21 22 /** This discretizes the range [0...1) into N discret values. 23 */ 24 class SkDiscreteMapper : public SkUnitMapper { 25 public: 26 SkDiscreteMapper(int segments); 27 // override from SkUnitMapper 28 virtual uint16_t mapUnit16(uint16_t x); 29 30 protected: 31 SkDiscreteMapper(SkFlattenableReadBuffer& ); 32 // overrides from SkFlattenable 33 virtual void flatten(SkFlattenableWriteBuffer& ); 34 virtual Factory getFactory(); 35 private: 36 int fSegments; 37 SkFract fScale; // computed from fSegments 38 39 static SkFlattenable* Create(SkFlattenableReadBuffer& buffer); 40 41 typedef SkUnitMapper INHERITED; 42 }; 43 44 /** This returns cos(x), to simulate lighting a sphere, where 0 maps to the 45 center of the sphere, and 1 maps to the edge. 46 */ 47 class SkCosineMapper : public SkUnitMapper { 48 public: 49 SkCosineMapper() {} 50 // override from SkUnitMapper 51 virtual uint16_t mapUnit16(uint16_t x); 52 53 protected: 54 SkCosineMapper(SkFlattenableReadBuffer&); 55 // overrides from SkFlattenable 56 virtual Factory getFactory(); 57 58 private: 59 static SkFlattenable* Create(SkFlattenableReadBuffer&); 60 61 typedef SkUnitMapper INHERITED; 62 }; 63 64 #endif 65 66
