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| 1 /* |
| 2 * Copyright 2014 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkDrawPictureCallback_DEFINED |
| 9 #define SkDrawPictureCallback_DEFINED |
| 10 |
| 11 /** |
| 12 * Subclasses of this can be passed to canvas.drawPicture(). During the drawing |
| 13 * of the picture, this callback will periodically be invoked. If its |
| 14 * abortDrawing() returns true, then picture playback will be interrupted. |
| 15 * |
| 16 * The resulting drawing is undefined, as there is no guarantee how often the |
| 17 * callback will be invoked. If the abort happens inside some level of nested |
| 18 * calls to save(), restore will automatically be called to return the state |
| 19 * to the same level it was before the drawPicture call was made. |
| 20 */ |
| 21 class SK_API SkDrawPictureCallback { |
| 22 public: |
| 23 SkDrawPictureCallback() {} |
| 24 virtual ~SkDrawPictureCallback() {} |
| 25 |
| 26 virtual bool abortDrawing() = 0; |
| 27 }; |
| 28 |
| 29 #endif//SkDrawPictureCallback_DEFINED |
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