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_WIN_SCREEN_CAPTURER_WIN_GDI_H_ 12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_GDI_H_ 13 14 #include "webrtc/modules/desktop_capture/screen_capturer.h" 15 16 #include <windows.h> 17 18 #include "webrtc/modules/desktop_capture/mouse_cursor_shape.h" 19 #include "webrtc/modules/desktop_capture/screen_capture_frame_queue.h" 20 #include "webrtc/modules/desktop_capture/screen_capturer_helper.h" 21 #include "webrtc/modules/desktop_capture/win/scoped_thread_desktop.h" 22 #include "webrtc/system_wrappers/interface/scoped_ptr.h" 23 24 namespace webrtc { 25 26 class Differ; 27 class MouseShapeObserver; 28 29 // ScreenCapturerWinGdi captures 32bit RGB using GDI. 30 // 31 // ScreenCapturerWinGdi is double-buffered as required by ScreenCapturer. 32 class ScreenCapturerWinGdi : public ScreenCapturer { 33 public: 34 explicit ScreenCapturerWinGdi(const DesktopCaptureOptions& options); 35 virtual ~ScreenCapturerWinGdi(); 36 37 // Overridden from ScreenCapturer: 38 virtual void Start(Callback* callback) OVERRIDE; 39 virtual void Capture(const DesktopRegion& region) OVERRIDE; 40 virtual void SetMouseShapeObserver( 41 MouseShapeObserver* mouse_shape_observer) OVERRIDE; 42 virtual bool GetScreenList(ScreenList* screens) OVERRIDE; 43 virtual bool SelectScreen(ScreenId id) OVERRIDE; 44 45 private: 46 typedef HRESULT (WINAPI * DwmEnableCompositionFunc)(UINT); 47 48 // Make sure that the device contexts match the screen configuration. 49 void PrepareCaptureResources(); 50 51 // Captures the current screen contents into the current buffer. Returns true 52 // if succeeded. 53 bool CaptureImage(); 54 55 // Capture the current cursor shape. 56 void CaptureCursor(); 57 58 Callback* callback_; 59 MouseShapeObserver* mouse_shape_observer_; 60 ScreenId current_screen_id_; 61 std::wstring current_device_key_; 62 63 // A thread-safe list of invalid rectangles, and the size of the most 64 // recently captured screen. 65 ScreenCapturerHelper helper_; 66 67 // Snapshot of the last cursor bitmap we sent to the client. This is used 68 // to diff against the current cursor so we only send a cursor-change 69 // message when the shape has changed. 70 MouseCursorShape last_cursor_; 71 72 ScopedThreadDesktop desktop_; 73 74 // GDI resources used for screen capture. 75 HDC desktop_dc_; 76 HDC memory_dc_; 77 78 // Queue of the frames buffers. 79 ScreenCaptureFrameQueue queue_; 80 81 // Rectangle describing the bounds of the desktop device context, relative to 82 // the primary display's top-left. 83 DesktopRect desktop_dc_rect_; 84 85 // Class to calculate the difference between two screen bitmaps. 86 scoped_ptr<Differ> differ_; 87 88 HMODULE dwmapi_library_; 89 DwmEnableCompositionFunc composition_func_; 90 91 // Used to suppress duplicate logging of SetThreadExecutionState errors. 92 bool set_thread_execution_state_failed_; 93 94 DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWinGdi); 95 }; 96 97 } // namespace webrtc 98 99 #endif // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_GDI_H_ 100
