Index: media/video/capture/screen/differ_block.h |
diff --git a/media/video/capture/screen/differ_block.h b/media/video/capture/screen/differ_block.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8b211e2e65d2d887fb22ee51e6b9fca022375213 |
--- /dev/null |
+++ b/media/video/capture/screen/differ_block.h |
@@ -0,0 +1,28 @@ |
+// Copyright (c) 2011 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |
+#define MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |
+ |
+#include "base/basictypes.h" |
+#include "media/base/media_export.h" |
+ |
+namespace media { |
+ |
+// Size (in pixels) of each square block used for diffing. This must be a |
+// multiple of sizeof(uint64)/8. |
+const int kBlockSize = 32; |
+ |
+// Format: BGRA 32 bit. |
+const int kBytesPerPixel = 4; |
+ |
+// Low level functions to compare 2 blocks of pixels. Zero means the blocks |
+// are identical. One - the blocks are different. |
+MEDIA_EXPORT int BlockDifference(const uint8* image1, |
+ const uint8* image2, |
+ int stride); |
+ |
+} // namespace media |
+ |
+#endif // MEDIA_VIDEO_CAPTURE_SCREEN_DIFFER_BLOCK_H_ |