2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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.
11 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
14 #include "webrtc/typedefs.h"
18 // Size (in pixels) of each square block used for diffing. This must be a
19 // multiple of sizeof(uint64)/8.
20 const int kBlockSize = 32;
22 // Format: BGRA 32 bit.
23 const int kBytesPerPixel = 4;
25 // Low level functions to compare 2 blocks of pixels. Zero means the blocks
26 // are identical. One - the blocks are different.
27 int BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride);
31 #endif // WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_