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 SkPixelXorXfermode_DEFINED 18 #define SkPixelXorXfermode_DEFINED 19 20 #include "SkXfermode.h" 21 22 /** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst). 23 This transformation does not follow premultiplied conventions, therefore 24 this proc *always* returns an opaque color (alpha == 255). Thus it is 25 not really usefull for operating on blended colors. 26 */ 27 class SkPixelXorXfermode : public SkXfermode { 28 public: SkPixelXorXfermode(SkColor opColor)29 SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {} 30 31 // override from SkFlattenable 32 virtual Factory getFactory(); 33 virtual void flatten(SkFlattenableWriteBuffer&); 34 35 protected: 36 // override from SkXfermode 37 virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst); 38 39 private: 40 SkColor fOpColor; 41 42 SkPixelXorXfermode(SkFlattenableReadBuffer& rb); 43 // our private factory 44 static SkFlattenable* Create(SkFlattenableReadBuffer&); 45 46 typedef SkXfermode INHERITED; 47 }; 48 49 #endif 50 51