| /* include/graphics/SkShaderExtras.h |
| ** |
| ** Copyright 2006, Google Inc. |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #ifndef SkShaderExtras_DEFINED |
| #define SkShaderExtras_DEFINED |
| |
| #include "SkShader.h" |
| |
| class SkColorComposer : public SkRefCnt { |
| public: |
| /** Called with two scanlines of color. The implementation writes out its combination of |
| those into the result[] scaline. |
| */ |
| virtual void composeSpan(const SkPMColor srcA[], const SkPMColor srcB[], int count, SkPMColor result[]) = 0; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////// |
| |
| class SkComposeShader : public SkShader { |
| public: |
| SkComposeShader(SkShader* sA, SkShader* sB, SkColorComposer* composer); |
| virtual ~SkComposeShader(); |
| |
| // override |
| virtual bool setContext(const SkBitmap& device, const SkPaint& paint, const SkMatrix& matrix); |
| virtual void shadeSpan(int x, int y, SkPMColor result[], int count); |
| |
| private: |
| enum { |
| COUNT = 32 |
| }; |
| SkShader* fShaderA; |
| SkShader* fShaderB; |
| SkColorComposer* fComposer; |
| |
| typedef SkShader INHERITED; |
| }; |
| |
| #endif |