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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |
| 6 #define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |
| 7 |
| 8 #include "base/basictypes.h" |
| 9 #include "media/base/media_export.h" |
| 10 |
| 11 namespace media { |
| 12 |
| 13 // Size (in pixels) of each square block used for diffing. This must be a |
| 14 // multiple of sizeof(uint64)/8. |
| 15 const int kBlockSize = 32; |
| 16 |
| 17 // Format: BGRA 32 bit. |
| 18 const int kBytesPerPixel = 4; |
| 19 |
| 20 // Low level functions to compare 2 blocks of pixels. Zero means the blocks |
| 21 // are identical. One - the blocks are different. |
| 22 MEDIA_EXPORT int BlockDifference(const uint8* image1, |
| 23 const uint8* image2, |
| 24 int stride); |
| 25 |
| 26 } // namespace media |
| 27 |
| 28 #endif // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |
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