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 <stdint.h> 15 16 namespace webrtc { 17 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; 21 22 // Format: BGRA 32 bit. 23 const int kBytesPerPixel = 4; 24 25 // Low level function to compare 2 blocks of pixels of size 26 // (kBlockSize, kBlockSize). Returns whether the blocks differ. 27 bool BlockDifference(const uint8_t* image1, 28 const uint8_t* image2, 29 int stride); 30 31 } // namespace webrtc 32 33 #endif // WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_ 34
