2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 #include "webrtc/modules/desktop_capture/differ_block.h"
15 #include "build/build_config.h"
16 #include "webrtc/modules/desktop_capture/differ_block_sse2.h"
17 #include "webrtc/system_wrappers/interface/cpu_features_wrapper.h"
21 int BlockDifference_C(const uint8_t* image1,
22 const uint8_t* image2,
24 int width_bytes = kBlockSize * kBytesPerPixel;
26 for (int y = 0; y < kBlockSize; y++) {
27 if (memcmp(image1, image2, width_bytes) != 0)
35 int BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride) {
36 static int (*diff_proc)(const uint8_t*, const uint8_t*, int) = NULL;
39 #if defined(ARCH_CPU_ARM_FAMILY) || defined(ARCH_CPU_MIPS_FAMILY)
40 // For ARM and MIPS processors, always use C version.
41 // TODO(hclam): Implement a NEON version.
42 diff_proc = &BlockDifference_C;
44 bool have_sse2 = WebRtc_GetCPUInfo(kSSE2) != 0;
45 // For x86 processors, check if SSE2 is supported.
46 if (have_sse2 && kBlockSize == 32) {
47 diff_proc = &BlockDifference_SSE2_W32;
48 } else if (have_sse2 && kBlockSize == 16) {
49 diff_proc = &BlockDifference_SSE2_W16;
51 diff_proc = &BlockDifference_C;
56 return diff_proc(image1, image2, stride);