1 /* 2 * Copyright (C) 2006 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 SkTransparentShader_DEFINED 18 #define SkTransparentShader_DEFINED 19 20 #include "SkShader.h" 21 22 class SkTransparentShader : public SkShader { 23 public: SkTransparentShader()24 SkTransparentShader() {} 25 virtual uint32_t getFlags(); 26 virtual bool setContext( const SkBitmap& device, 27 const SkPaint& paint, 28 const SkMatrix& matrix); 29 virtual void shadeSpan(int x, int y, SkPMColor[], int count); 30 virtual void shadeSpan16(int x, int y, uint16_t span[], int count); 31 32 // overrides for SkFlattenable getFactory()33 virtual Factory getFactory() { return Create; } flatten(SkFlattenableWriteBuffer & buffer)34 virtual void flatten(SkFlattenableWriteBuffer& buffer) 35 { 36 this->INHERITED::flatten(buffer); 37 } 38 39 private: 40 // these are a cache from the call to setContext() 41 const SkBitmap* fDevice; 42 uint8_t fAlpha; 43 SkTransparentShader(SkFlattenableReadBuffer & buffer)44 SkTransparentShader(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {} 45 Create(SkFlattenableReadBuffer & buffer)46 static SkFlattenable* Create(SkFlattenableReadBuffer& buffer) 47 { 48 return SkNEW_ARGS(SkTransparentShader, (buffer)); 49 } 50 51 typedef SkShader INHERITED; 52 }; 53 54 #endif 55 56