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 #include "webrtc/modules/desktop_capture/win/screen_capture_utils.h" 12 13 #include <assert.h> 14 #include <windows.h> 15 16 namespace webrtc { 17 18 bool GetScreenList(ScreenCapturer::ScreenList* screens) { 19 assert(screens->size() == 0); 20 21 BOOL enum_result = TRUE; 22 for (int device_index = 0;; ++device_index) { 23 DISPLAY_DEVICE device; 24 device.cb = sizeof(device); 25 enum_result = EnumDisplayDevices(NULL, device_index, &device, 0); 26 27 // |enum_result| is 0 if we have enumerated all devices. 28 if (!enum_result) 29 break; 30 31 // We only care about active displays. 32 if (!(device.StateFlags & DISPLAY_DEVICE_ACTIVE)) 33 continue; 34 35 ScreenCapturer::Screen screen; 36 screen.id = device_index; 37 screens->push_back(screen); 38 } 39 return true; 40 } 41 42 bool IsScreenValid(ScreenId screen, std::wstring* device_key) { 43 if (screen == kFullDesktopScreenId) { 44 *device_key = L""; 45 return true; 46 } 47 48 DISPLAY_DEVICE device; 49 device.cb = sizeof(device); 50 BOOL enum_result = EnumDisplayDevices(NULL, screen, &device, 0); 51 if (enum_result) 52 *device_key = device.DeviceKey; 53 54 return !!enum_result; 55 } 56 57 DesktopRect GetScreenRect(ScreenId screen, const std::wstring& device_key) { 58 if (screen == kFullDesktopScreenId) { 59 return DesktopRect::MakeXYWH(GetSystemMetrics(SM_XVIRTUALSCREEN), 60 GetSystemMetrics(SM_YVIRTUALSCREEN), 61 GetSystemMetrics(SM_CXVIRTUALSCREEN), 62 GetSystemMetrics(SM_CYVIRTUALSCREEN)); 63 } 64 65 DISPLAY_DEVICE device; 66 device.cb = sizeof(device); 67 BOOL result = EnumDisplayDevices(NULL, screen, &device, 0); 68 if (!result) 69 return DesktopRect(); 70 71 // Verifies the device index still maps to the same display device, to make 72 // sure we are capturing the same device when devices are added or removed. 73 // DeviceKey is documented as reserved, but it actually contains the registry 74 // key for the device and is unique for each monitor, while DeviceID is not. 75 if (device_key != device.DeviceKey) 76 return DesktopRect(); 77 78 DEVMODE device_mode; 79 device_mode.dmSize = sizeof(device_mode); 80 device_mode.dmDriverExtra = 0; 81 result = EnumDisplaySettingsEx( 82 device.DeviceName, ENUM_CURRENT_SETTINGS, &device_mode, 0); 83 if (!result) 84 return DesktopRect(); 85 86 return DesktopRect::MakeXYWH(device_mode.dmPosition.x, 87 device_mode.dmPosition.y, 88 device_mode.dmPelsWidth, 89 device_mode.dmPelsHeight); 90 } 91 92 } // namespace webrtc 93
