reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 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 SkComposeShader_DEFINED |
| 18 | #define SkComposeShader_DEFINED |
| 19 | |
| 20 | #include "SkShader.h" |
| 21 | |
| 22 | class SkXfermode; |
| 23 | |
| 24 | /////////////////////////////////////////////////////////////////////////////////////////// |
| 25 | |
| 26 | /** \class SkComposeShader |
| 27 | This subclass of shader returns the coposition of two other shaders, combined by |
| 28 | a xfermode. |
| 29 | */ |
ctguil@chromium.org | c7d9f9d | 2011-05-20 22:16:08 +0000 | [diff] [blame^] | 30 | class SK_API SkComposeShader : public SkShader { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 31 | public: |
| 32 | /** Create a new compose shader, given shaders A, B, and a combining xfermode mode. |
| 33 | When the xfermode is called, it will be given the result from shader A as its |
| 34 | "dst", and the result of from shader B as its "src". |
| 35 | mode->xfer32(sA_result, sB_result, ...) |
| 36 | @param shaderA The colors from this shader are seen as the "dst" by the xfermode |
| 37 | @param shaderB The colors from this shader are seen as the "src" by the xfermode |
| 38 | @param mode The xfermode that combines the colors from the two shaders. If mode |
| 39 | is null, then SRC_OVER is assumed. |
| 40 | */ |
| 41 | SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL); |
| 42 | virtual ~SkComposeShader(); |
| 43 | |
| 44 | // override |
| 45 | virtual bool setContext(const SkBitmap& device, const SkPaint& paint, const SkMatrix& matrix); |
| 46 | virtual void shadeSpan(int x, int y, SkPMColor result[], int count); |
| 47 | virtual void beginSession(); |
| 48 | virtual void endSession(); |
| 49 | |
| 50 | protected: |
| 51 | SkComposeShader(SkFlattenableReadBuffer& ); |
| 52 | virtual void flatten(SkFlattenableWriteBuffer& ); |
| 53 | virtual Factory getFactory() { return CreateProc; } |
| 54 | |
| 55 | private: |
| 56 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 57 | return SkNEW_ARGS(SkComposeShader, (buffer)); } |
| 58 | |
| 59 | SkShader* fShaderA; |
| 60 | SkShader* fShaderB; |
| 61 | SkXfermode* fMode; |
| 62 | |
| 63 | typedef SkShader INHERITED; |
| 64 | }; |
| 65 | |
| 66 | #endif |