1 /* 2 * Copyright (C) 2007 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 SkColorShader_DEFINED 18 #define SkColorShader_DEFINED 19 20 #include "SkShader.h" 21 22 /** \class SkColorShader 23 A Shader that represents a single color. In general, this effect can be 24 accomplished by just using the color field on the paint, but if an 25 actual shader object is needed, this provides that feature. 26 */ 27 class SkColorShader : public SkShader { 28 public: 29 /** Create a ColorShader that will inherit its color from the Paint 30 at draw time. 31 */ SkColorShader()32 SkColorShader() : fFlags(0), fInheritColor(true) {} 33 34 /** Create a ColorShader that ignores the color in the paint, and uses the 35 specified color. Note: like all shaders, at draw time the paint's alpha 36 will be respected, and is applied to the specified color. 37 */ SkColorShader(SkColor c)38 SkColorShader(SkColor c) : fColor(c), fFlags(0), fInheritColor(false) {} 39 getFlags()40 virtual uint32_t getFlags() { return fFlags; } 41 virtual uint8_t getSpan16Alpha() const; 42 virtual bool setContext(const SkBitmap& device, const SkPaint& paint, 43 const SkMatrix& matrix); 44 virtual void shadeSpan(int x, int y, SkPMColor span[], int count); 45 virtual void shadeSpan16(int x, int y, uint16_t span[], int count); 46 virtual void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count); 47 48 protected: 49 SkColorShader(SkFlattenableReadBuffer& ); 50 virtual void flatten(SkFlattenableWriteBuffer& ); getFactory()51 virtual Factory getFactory() { return CreateProc; } 52 private: CreateProc(SkFlattenableReadBuffer & buffer)53 static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { 54 return SkNEW_ARGS(SkColorShader, (buffer)); 55 } 56 SkColor fColor; // ignored if fInheritColor is true 57 SkPMColor fPMColor; // cached after setContext() 58 uint32_t fFlags; // cached after setContext() 59 uint16_t fColor16; // cached after setContext() 60 SkBool8 fInheritColor; 61 62 typedef SkShader INHERITED; 63 }; 64 65 #endif 66