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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_RESIZING_HOST_OBSERVER_H_
#define REMOTING_HOST_RESIZING_HOST_OBSERVER_H_
#include <stddef.h>
#include <map>
#include <memory>
#include <set>
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "remoting/host/base/screen_controls.h"
#include "remoting/host/base/screen_resolution.h"
namespace base {
class TickClock;
}
namespace remoting {
class DesktopDisplayInfo;
class DesktopDisplayInfoMonitor;
class DesktopResizer;
// TODO(alexeypa): Rename this class to reflect that it is not
// HostStatusObserver any more.
// Uses the specified DesktopResizer to match host desktop size to the client
// view size as closely as is possible. When the connection closes, restores
// the original desktop size if restore is true.
class ResizingHostObserver : public ScreenControls {
public:
explicit ResizingHostObserver(std::unique_ptr<DesktopResizer> desktop_resizer,
bool restore);
ResizingHostObserver(const ResizingHostObserver&) = delete;
ResizingHostObserver& operator=(const ResizingHostObserver&) = delete;
~ResizingHostObserver() override;
void RegisterForDisplayChanges(DesktopDisplayInfoMonitor& monitor);
// ScreenControls interface.
void SetScreenResolution(const ScreenResolution& resolution,
std::optional<webrtc::ScreenId> screen_id) override;
void SetVideoLayout(const protocol::VideoLayout& video_layout) override;
// Allows tests to provide display-info updates.
void SetDisplayInfoForTesting(const DesktopDisplayInfo& display_info);
// Provide a replacement for base::TimeTicks::Now so that this class can be
// unit-tested in a timely manner. This function will be called exactly
// once for each call to SetScreenResolution.
void SetClockForTesting(const base::TickClock* clock);
private:
// Restores the given monitor's original resolution, and removes it from the
// stored list.
void RestoreScreenResolution(webrtc::ScreenId screen_id);
// Restores every monitor's resolution.
void RestoreAllScreenResolutions();
// Stores the original resolution for the monitor |screen_id|. This does not
// overwrite any previously stored value, so the recorded resolutions are
// always the first ones for each monitor.
void RecordOriginalResolution(ScreenResolution resolution,
webrtc::ScreenId screen_id);
void OnDisplayInfoChanged(const DesktopDisplayInfo& display_info);
std::unique_ptr<DesktopResizer> desktop_resizer_;
// List of per-monitor original resolutions to be restored.
std::map<webrtc::ScreenId, ScreenResolution> original_resolutions_;
// List of current monitor IDs, populated from OnDisplayInfoChanged().
// Requests to change a resolution should be dropped if there is no
// monitor matching the requested ID. Requests without any ID should be
// applied to the single monitor if there is only one.
std::set<webrtc::ScreenId> current_monitor_ids_;
// Whether monitors should be restored when this object is destroyed.
bool restore_;
// If SetScreenResolution() is called without any screen_id, and the
// video-layout is still empty, the requested resolution is stored here so it
// can be applied when the next video-layout is received. This is needed
// because, on Windows, DesktopSessionAgent::Start() calls
// SetScreenResolution() immediately after creating this object.
ScreenResolution pending_resolution_request_;
// State to manage rate-limiting of desktop resizes.
base::OneShotTimer deferred_resize_timer_;
base::TimeTicks previous_resize_time_;
raw_ptr<const base::TickClock> clock_;
base::WeakPtrFactory<ResizingHostObserver> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_RESIZING_HOST_OBSERVER_H_
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