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/*
* Copyright (c) 2014 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 WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
#define WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
#include <ApplicationServices/ApplicationServices.h>
#include "webrtc/modules/desktop_capture/window_capturer.h"
#include "webrtc/system_wrappers/include/atomic32.h"
#include "webrtc/system_wrappers/include/tick_util.h"
namespace webrtc {
// This is a work around for the Chrome tab full-screen behavior: Chrome
// creates a new window in full-screen mode to show a tab full-screen and
// minimizes the old window. To continue capturing in this case, we try to
// find the new full-screen window using these criteria:
// 0. The original shared window is minimized.
// 1. The original shared window's owner application name is "Google Chrome".
// 2. The original window and the new window have the same title and owner
// pid.
// 3. The new window is full-screen.
// 4. The new window didn't exist at least 500 millisecond ago.
class FullScreenChromeWindowDetector {
public:
FullScreenChromeWindowDetector();
void AddRef() { ++ref_count_; }
void Release() {
if (--ref_count_ == 0)
delete this;
}
// Returns the full-screen window in place of the original window if all the
// criteria are met, or kCGNullWindowID if no such window found.
CGWindowID FindFullScreenWindow(CGWindowID original_window);
// The caller should call this function periodically, no less than twice per
// second.
void UpdateWindowListIfNeeded(CGWindowID original_window);
private:
~FullScreenChromeWindowDetector();
Atomic32 ref_count_;
// We cache the last two results of the window list, so
// |previous_window_list_| is taken at least 500ms before the next Capture()
// call. If we only save the last result, we may get false positive (i.e.
// full-screen window exists in the list) if Capture() is called too soon.
WindowCapturer::WindowList current_window_list_;
WindowCapturer::WindowList previous_window_list_;
TickTime last_udpate_time_;
RTC_DISALLOW_COPY_AND_ASSIGN(FullScreenChromeWindowDetector);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
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