| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * 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 SkDrawFilter_DEFINED |
| #define SkDrawFilter_DEFINED |
| |
| #include "SkRefCnt.h" |
| |
| ////////////////// EXPERIMENTAL ////////////////////////// |
| |
| class SkCanvas; |
| class SkPaint; |
| |
| /** Right before something is being draw, filter() is called with the |
| current canvas and paint. If it returns true, then drawing proceeds |
| with the (possibly modified) canvas/paint, and then restore() is called |
| to restore the canvas/paint to their state before filter() was called. |
| If filter returns false, canvas/paint should not have been changed, and |
| restore() will not be called. |
| */ |
| class SkDrawFilter : public SkRefCnt { |
| public: |
| enum Type { |
| kPaint_Type, |
| kPoint_Type, |
| kLine_Type, |
| kBitmap_Type, |
| kRect_Type, |
| kPath_Type, |
| kText_Type |
| }; |
| |
| /** Return true to allow the draw to continue (with possibly modified |
| canvas/paint). If true is returned, then restore() will be called. |
| */ |
| virtual bool filter(SkCanvas*, SkPaint*, Type) = 0; |
| /** If filter() returned true, then restore() will be called to restore the |
| canvas/paint to their previous states |
| */ |
| virtual void restore(SkCanvas*, SkPaint*, Type) = 0; |
| }; |
| |
| #endif |