604fd2f1ab
Bug: webrtc:13555, webrtc:13082 Change-Id: I2c2cbcbd918f0cfa970c1a964893220ba11d4b41 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/247960 Reviewed-by: Artem Titov <titovartem@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: (Daniel.L) Byoungchan Lee <daniel.l@hpcnt.com> Cr-Commit-Position: refs/heads/main@{#35771}
92 lines
3.5 KiB
C++
92 lines
3.5 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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#ifndef MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURER_HELPER_H_
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#define MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURER_HELPER_H_
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#include <memory>
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#include "modules/desktop_capture/desktop_geometry.h"
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#include "modules/desktop_capture/desktop_region.h"
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#include "rtc_base/synchronization/mutex.h"
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#include "rtc_base/thread_annotations.h"
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namespace webrtc {
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// ScreenCapturerHelper is intended to be used by an implementation of the
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// ScreenCapturer interface. It maintains a thread-safe invalid region, and
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// the size of the most recently captured screen, on behalf of the
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// ScreenCapturer that owns it.
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class ScreenCapturerHelper {
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public:
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ScreenCapturerHelper() = default;
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~ScreenCapturerHelper() = default;
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ScreenCapturerHelper(const ScreenCapturerHelper&) = delete;
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ScreenCapturerHelper& operator=(const ScreenCapturerHelper&) = delete;
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// Clear out the invalid region.
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void ClearInvalidRegion();
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// Invalidate the specified region.
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void InvalidateRegion(const DesktopRegion& invalid_region);
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// Invalidate the entire screen, of a given size.
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void InvalidateScreen(const DesktopSize& size);
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// Copies current invalid region to `invalid_region` clears invalid region
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// storage for the next frame.
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void TakeInvalidRegion(DesktopRegion* invalid_region);
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// Access the size of the most recently captured screen.
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const DesktopSize& size_most_recent() const;
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void set_size_most_recent(const DesktopSize& size);
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// Lossy compression can result in color values leaking between pixels in one
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// block. If part of a block changes, then unchanged parts of that block can
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// be changed in the compressed output. So we need to re-render an entire
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// block whenever part of the block changes.
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//
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// If `log_grid_size` is >= 1, then this function makes TakeInvalidRegion()
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// produce an invalid region expanded so that its vertices lie on a grid of
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// size 2 ^ `log_grid_size`. The expanded region is then clipped to the size
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// of the most recently captured screen, as previously set by
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// set_size_most_recent().
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// If `log_grid_size` is <= 0, then the invalid region is not expanded.
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void SetLogGridSize(int log_grid_size);
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// Expands a region so that its vertices all lie on a grid.
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// The grid size must be >= 2, so `log_grid_size` must be >= 1.
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static void ExpandToGrid(const DesktopRegion& region,
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int log_grid_size,
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DesktopRegion* result);
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private:
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// A region that has been manually invalidated (through InvalidateRegion).
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// These will be returned as dirty_region in the capture data during the next
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// capture.
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DesktopRegion invalid_region_ RTC_GUARDED_BY(invalid_region_mutex_);
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// A lock protecting `invalid_region_` across threads.
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Mutex invalid_region_mutex_;
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// The size of the most recently captured screen.
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DesktopSize size_most_recent_;
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// The log (base 2) of the size of the grid to which the invalid region is
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// expanded.
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// If the value is <= 0, then the invalid region is not expanded to a grid.
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int log_grid_size_ = 0;
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};
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} // namespace webrtc
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#endif // MODULES_DESKTOP_CAPTURE_SCREEN_CAPTURER_HELPER_H_
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