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 AddRef()37 void AddRef() { ++ref_count_; } Release()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