fef8653c5a
dirty region than the real screen change. A similar behavior may happen on other platforms with damage notification support. So it's better to have an individual layer to handle the Differ logic, and remove capturing independent logic out of each ScreenCapturer* implementation. So this change does following things, 1. Update differ_block to handle variable height. differ_block_sse2 has been renamed to differ_vector_sse2. 2. A new ScreenCapturerDifferWrapper implementation to help set DesktopFrame::updated_region(). It uses an underlying ScreenCapturer to do the real capture work, and updates the updated region of DesktopFrame returned from OnCaptureResult function. 3. FakeDesktopCapturer and FakeScreenCapturer to generate controllable DesktopFrame by using DesktopFrameGenerator and DesktopFramePainter. 4. Test ScreenCapturerDifferWrapper by using FakeScreenCapturer. After this change, we can eventually remove all Differ logic from ScreenCapturer* implementations, and fix a potential crash bug in ScreenCapturerLinux class. It wrongly assumes previous_frame() has a same size as current_frame(). https://goo.gl/3nSqOC BUG=633802 TBR=kjellander@webrtc.org Review-Url: https://codereview.webrtc.org/2202443002 Cr-Commit-Position: refs/heads/master@{#14076}
72 lines
2.1 KiB
C++
72 lines
2.1 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 "webrtc/typedefs.h"
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#include "webrtc/modules/desktop_capture/differ_vector_sse2.h"
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#include "webrtc/system_wrappers/include/cpu_features_wrapper.h"
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namespace webrtc {
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namespace {
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bool VectorDifference_C(const uint8_t* image1, const uint8_t* image2) {
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return memcmp(image1, image2, kBlockSize * kBytesPerPixel) != 0;
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}
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} // namespace
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bool VectorDifference(const uint8_t* image1, const uint8_t* image2) {
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static bool (*diff_proc)(const uint8_t*, const uint8_t*) = nullptr;
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if (!diff_proc) {
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#if defined(WEBRTC_ARCH_ARM_FAMILY) || defined(WEBRTC_ARCH_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 = &VectorDifference_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 = &VectorDifference_SSE2_W32;
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} else if (have_sse2 && kBlockSize == 16) {
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diff_proc = &VectorDifference_SSE2_W16;
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} else {
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diff_proc = &VectorDifference_C;
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}
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#endif
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}
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return diff_proc(image1, image2);
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}
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bool BlockDifference(const uint8_t* image1,
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const uint8_t* image2,
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int height,
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int stride) {
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for (int i = 0; i < height; i++) {
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if (VectorDifference(image1, image2)) {
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return true;
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}
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image1 += stride;
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image2 += stride;
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}
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return false;
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}
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bool BlockDifference(const uint8_t* image1, const uint8_t* image2, int stride) {
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return BlockDifference(image1, image2, kBlockSize, stride);
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}
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} // namespace webrtc
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