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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/video/capture/screen/differ_block.h"
#include "base/cpu.h"
#include "build/build_config.h"
#include "media/video/capture/screen/differ_block_sse2.h"
namespace media {
int BlockDifference_C(const uint8* image1, const uint8* image2, int stride) {
int width_bytes = kBlockSize * kBytesPerPixel;
for (int y = 0; y < kBlockSize; y++) {
if (memcmp(image1, image2, width_bytes) != 0)
return 1;
image1 += stride;
image2 += stride;
}
return 0;
}
int BlockDifference(const uint8* image1, const uint8* image2, int stride) {
static int (*diff_proc)(const uint8*, const uint8*, int) = NULL;
if (!diff_proc) {
#if defined(ARCH_CPU_ARM_FAMILY)
// For ARM processors, always use C version.
// TODO(hclam): Implement a NEON version.
diff_proc = &BlockDifference_C;
#else
base::CPU cpu;
// For x86 processors, check if SSE2 is supported.
if (cpu.has_sse2() && kBlockSize == 32) {
diff_proc = &BlockDifference_SSE2_W32;
} else if (cpu.has_sse2() && kBlockSize == 16) {
diff_proc = &BlockDifference_SSE2_W16;
} else {
diff_proc = &BlockDifference_C;
}
#endif
}
return diff_proc(image1, image2, stride);
}
} // namespace media
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