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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_WEBRTC_CURRENT_TAB_DESKTOP_MEDIA_LIST_H_
#define CHROME_BROWSER_MEDIA_WEBRTC_CURRENT_TAB_DESKTOP_MEDIA_LIST_H_
#include "chrome/browser/media/webrtc/desktop_media_list_base.h"
#include "base/task/sequenced_task_runner.h"
#include "content/public/browser/web_contents.h"
// Implementation of DesktopMediaList that only follows a single tab.
class CurrentTabDesktopMediaList : public DesktopMediaListBase {
public:
explicit CurrentTabDesktopMediaList(content::WebContents* web_contents);
CurrentTabDesktopMediaList(const CurrentTabDesktopMediaList&) = delete;
CurrentTabDesktopMediaList& operator=(const CurrentTabDesktopMediaList&) =
delete;
~CurrentTabDesktopMediaList() override;
private:
friend class CurrentTabDesktopMediaListTest;
// For testing.
CurrentTabDesktopMediaList(content::WebContents* web_contents,
base::TimeDelta period,
DesktopMediaListObserver* observer);
void Refresh(bool update_thumbnails) override;
// Called on the UI thread after the captured image is handled. If the
// image was new, it's rescaled to the desired size and sent back in |image|.
// Otherwise, an empty Optional is sent back. In either case, |hash| is the
// hash value of the frame that was handled.
void OnCaptureHandled(uint32_t hash,
const std::optional<gfx::ImageSkia>& image);
// It's hard for tests to control what kind of image is given by the mock.
// Normally it just returns the same thing again and again. To simulate a
// new frame, we can just forget the last one.
void ResetLastHashForTesting();
// This "list" tracks a single view - the one represented by these variables.
const content::DesktopMediaID media_id_;
// Avoid two concurrent refreshes.
bool refresh_in_progress_ = false;
// The hash of the last captured frame. Used to detect identical frames
// and prevent needless rescaling.
std::optional<uint32_t> last_hash_;
// The heavy lifting involved with rescaling images into thumbnails is
// moved off of the UI thread and onto this task runner.
scoped_refptr<base::SequencedTaskRunner> thumbnail_task_runner_;
base::WeakPtrFactory<CurrentTabDesktopMediaList> weak_factory_{this};
};
#endif // CHROME_BROWSER_MEDIA_WEBRTC_CURRENT_TAB_DESKTOP_MEDIA_LIST_H_
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