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/*
* Copyright (c) 2017 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.
*/
#ifndef MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
#define MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
#include "modules/desktop_capture/desktop_capturer.h"
#include "modules/desktop_capture/desktop_geometry.h"
#include "rtc_base/containers/flat_map.h"
namespace webrtc {
// A passive monitor to detect the change of display configuration on a Windows
// system.
// TODO(zijiehe): Also check for pixel format changes.
class DisplayConfigurationMonitor {
public:
// Checks whether the display configuration has changed since the last time
// IsChanged() was called. |source_id| is used to observe changes for a
// specific display or all displays if kFullDesktopScreenId is passed in.
// Returns false if object was Reset() or if IsChanged() has not been called.
bool IsChanged(DesktopCapturer::SourceId source_id);
// Resets to the initial state.
void Reset();
private:
DesktopVector GetDpiForSourceId(DesktopCapturer::SourceId source_id);
// Represents the size of the desktop which includes all displays.
DesktopRect rect_;
// Tracks the DPI for each display being captured. We need to track for each
// display as each one can be configured to use a different DPI which will not
// be reflected in calls to get the system DPI.
flat_map<DesktopCapturer::SourceId, DesktopVector> source_dpis_;
// Indicates whether |rect_| and |source_dpis_| have been initialized. This is
// used to prevent the monitor instance from signaling 'IsChanged()' before
// the initial values have been set.
bool initialized_ = false;
};
} // namespace webrtc
#endif // MODULES_DESKTOP_CAPTURE_WIN_DISPLAY_CONFIGURATION_MONITOR_H_
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