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