1/*
2 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
12#define WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
13
14#include "webrtc/typedefs.h"
15
16namespace webrtc {
17
18// Size (in pixels) of each square block used for diffing. This must be a
19// multiple of sizeof(uint64)/8.
20const int kBlockSize = 32;
21
22// Format: BGRA 32 bit.
23const int kBytesPerPixel = 4;
24
25// Low level functions to compare 2 blocks of pixels. Zero means the blocks
26// are identical. One - the blocks are different.
27int BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride);
28
29}  // namespace webrtc
30
31#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
32