diff options
Diffstat (limited to 'third_party/libwebrtc/modules/desktop_capture/differ_block.cc')
-rw-r--r-- | third_party/libwebrtc/modules/desktop_capture/differ_block.cc | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/desktop_capture/differ_block.cc b/third_party/libwebrtc/modules/desktop_capture/differ_block.cc new file mode 100644 index 0000000000..54ee0829ea --- /dev/null +++ b/third_party/libwebrtc/modules/desktop_capture/differ_block.cc @@ -0,0 +1,71 @@ +/* + * 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 "modules/desktop_capture/differ_vector_sse2.h" +#include "rtc_base/system/arch.h" +#include "system_wrappers/include/cpu_features_wrapper.h" + +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 |