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      1 /*
      2  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
     12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
     13 
     14 #include <ApplicationServices/ApplicationServices.h>
     15 
     16 #include "webrtc/modules/desktop_capture/window_capturer.h"
     17 #include "webrtc/system_wrappers/include/atomic32.h"
     18 #include "webrtc/system_wrappers/include/tick_util.h"
     19 
     20 namespace webrtc {
     21 
     22 // This is a work around for the Chrome tab full-screen behavior: Chrome
     23 // creates a new window in full-screen mode to show a tab full-screen and
     24 // minimizes the old window. To continue capturing in this case, we try to
     25 // find the new full-screen window using these criteria:
     26 // 0. The original shared window is minimized.
     27 // 1. The original shared window's owner application name is "Google Chrome".
     28 // 2. The original window and the new window have the same title and owner
     29 // pid.
     30 // 3. The new window is full-screen.
     31 // 4. The new window didn't exist at least 500 millisecond ago.
     32 
     33 class FullScreenChromeWindowDetector {
     34  public:
     35   FullScreenChromeWindowDetector();
     36 
     37   void AddRef() { ++ref_count_; }
     38   void Release() {
     39     if (--ref_count_ == 0)
     40       delete this;
     41   }
     42 
     43   // Returns the full-screen window in place of the original window if all the
     44   // criteria are met, or kCGNullWindowID if no such window found.
     45   CGWindowID FindFullScreenWindow(CGWindowID original_window);
     46 
     47   // The caller should call this function periodically, no less than twice per
     48   // second.
     49   void UpdateWindowListIfNeeded(CGWindowID original_window);
     50 
     51  private:
     52   ~FullScreenChromeWindowDetector();
     53 
     54   Atomic32 ref_count_;
     55 
     56   // We cache the last two results of the window list, so
     57   // |previous_window_list_| is taken at least 500ms before the next Capture()
     58   // call. If we only save the last result, we may get false positive (i.e.
     59   // full-screen window exists in the list) if Capture() is called too soon.
     60   WindowCapturer::WindowList current_window_list_;
     61   WindowCapturer::WindowList previous_window_list_;
     62   TickTime last_udpate_time_;
     63 
     64   RTC_DISALLOW_COPY_AND_ASSIGN(FullScreenChromeWindowDetector);
     65 };
     66 
     67 }  // namespace webrtc
     68 
     69 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_MAC_FULL_SCREEN_CHROME_WINDOW_DETECTOR_H_
     70