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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
#define MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
#include <stdint.h>
namespace webrtc {
// 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 function to compare 2 vectors of pixels of size kBlockSize. Returns
// whether the blocks differ.
bool VectorDifference(const uint8_t* image1, const uint8_t* image2);
// Low level function to compare 2 blocks of pixels of size
// (kBlockSize, `height`). Returns whether the blocks differ.
bool BlockDifference(const uint8_t* image1,
const uint8_t* image2,
int height,
int stride);
// Low level function to compare 2 blocks of pixels of size
// (kBlockSize, kBlockSize). Returns whether the blocks differ.
bool BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride);
} // namespace webrtc
#endif // MODULES_DESKTOP_CAPTURE_DIFFER_BLOCK_H_
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