3d34f66292
R=alexeypa@chromium.org, wez@chromium.org Review URL: https://webrtc-codereview.appspot.com/1586005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4175 4adac7df-926f-26a2-2b94-8c16560cd09d
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/desktop_capture/differ_block.h"
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#include <string.h>
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#include "build/build_config.h"
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#include "webrtc/modules/desktop_capture/differ_block_sse2.h"
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#include "webrtc/system_wrappers/interface/cpu_features_wrapper.h"
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namespace webrtc {
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int BlockDifference_C(const uint8_t* image1,
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const uint8_t* image2,
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int stride) {
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int width_bytes = kBlockSize * kBytesPerPixel;
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for (int y = 0; y < kBlockSize; y++) {
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if (memcmp(image1, image2, width_bytes) != 0)
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return 1;
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image1 += stride;
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image2 += stride;
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}
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return 0;
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}
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int BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride) {
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static int (*diff_proc)(const uint8_t*, const uint8_t*, int) = NULL;
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if (!diff_proc) {
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#if defined(ARCH_CPU_ARM_FAMILY) || defined(ARCH_CPU_MIPS_FAMILY)
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// For ARM and MIPS processors, always use C version.
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// TODO(hclam): Implement a NEON version.
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diff_proc = &BlockDifference_C;
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#else
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bool have_sse2 = WebRtc_GetCPUInfo(kSSE2) != 0;
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// For x86 processors, check if SSE2 is supported.
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if (have_sse2 && kBlockSize == 32) {
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diff_proc = &BlockDifference_SSE2_W32;
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} else if (have_sse2 && kBlockSize == 16) {
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diff_proc = &BlockDifference_SSE2_W16;
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} else {
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diff_proc = &BlockDifference_C;
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}
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#endif
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}
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return diff_proc(image1, image2, stride);
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}
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} // namespace webrtc
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