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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.
*/
#include "webrtc/modules/desktop_capture/differ_block.h"
#include <string.h>
#include "webrtc/typedefs.h"
#include "webrtc/modules/desktop_capture/differ_block_sse2.h"
#include "webrtc/system_wrappers/include/cpu_features_wrapper.h"
namespace webrtc {
bool BlockDifference_C(const uint8_t* image1,
const uint8_t* image2,
int stride) {
int width_bytes = kBlockSize * kBytesPerPixel;
for (int y = 0; y < kBlockSize; y++) {
if (memcmp(image1, image2, width_bytes) != 0)
return true;
image1 += stride;
image2 += stride;
}
return false;
}
bool BlockDifference(const uint8_t* image1,
const uint8_t* image2,
int stride) {
static bool (*diff_proc)(const uint8_t*, const uint8_t*, int) = NULL;
if (!diff_proc) {
#if defined(WEBRTC_ARCH_ARM_FAMILY) || defined(WEBRTC_ARCH_MIPS_FAMILY)
// For ARM and MIPS processors, always use C version.
// TODO(hclam): Implement a NEON version.
diff_proc = &BlockDifference_C;
#else
bool have_sse2 = WebRtc_GetCPUInfo(kSSE2) != 0;
// For x86 processors, check if SSE2 is supported.
if (have_sse2 && kBlockSize == 32) {
diff_proc = &BlockDifference_SSE2_W32;
} else if (have_sse2 && kBlockSize == 16) {
diff_proc = &BlockDifference_SSE2_W16;
} else {
diff_proc = &BlockDifference_C;
}
#endif
}
return diff_proc(image1, image2, stride);
}
} // namespace webrtc
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