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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 "modules/desktop_capture/differ_block.h"
#include <string.h>
#include "rtc_base/system/arch.h"
#include "system_wrappers/include/cpu_features_wrapper.h"
// This needs to be after rtc_base/system/arch.h which defines
// architecture macros.
#if defined(WEBRTC_ARCH_X86_FAMILY)
#include "modules/desktop_capture/differ_vector_sse2.h"
#endif
namespace webrtc {
namespace {
bool VectorDifference_C(const uint8_t* image1, const uint8_t* image2) {
return memcmp(image1, image2, kBlockSize * kBytesPerPixel) != 0;
}
} // namespace
bool VectorDifference(const uint8_t* image1, const uint8_t* image2) {
static bool (*diff_proc)(const uint8_t*, const uint8_t*) = nullptr;
if (!diff_proc) {
#if defined(WEBRTC_ARCH_X86_FAMILY)
bool have_sse2 = GetCPUInfo(kSSE2) != 0;
// For x86 processors, check if SSE2 is supported.
if (have_sse2 && kBlockSize == 32) {
diff_proc = &VectorDifference_SSE2_W32;
} else if (have_sse2 && kBlockSize == 16) {
diff_proc = &VectorDifference_SSE2_W16;
} else {
diff_proc = &VectorDifference_C;
}
#else
// For other processors, always use C version.
// TODO(hclam): Implement a NEON version.
diff_proc = &VectorDifference_C;
#endif
}
return diff_proc(image1, image2);
}
bool BlockDifference(const uint8_t* image1,
const uint8_t* image2,
int height,
int stride) {
for (int i = 0; i < height; i++) {
if (VectorDifference(image1, image2)) {
return true;
}
image1 += stride;
image2 += stride;
}
return false;
}
bool BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride) {
return BlockDifference(image1, image2, kBlockSize, stride);
}
} // namespace webrtc