blob: 95f6d92059a501d129bb00996494a8becccf8000 [file] [log] [blame]
* 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.
#include "modules/desktop_capture/win/screen_capture_utils.h"
#include <windows.h>
#include <string>
#include <vector>
#include "modules/desktop_capture/desktop_capturer.h"
#include "rtc_base/checks.h"
#include "rtc_base/string_utils.h"
#include "rtc_base/win32.h"
namespace webrtc {
bool GetScreenList(DesktopCapturer::SourceList* screens,
std::vector<std::string>* device_names /* = nullptr */) {
RTC_DCHECK_EQ(screens->size(), 0U);
if (device_names) {
RTC_DCHECK_EQ(device_names->size(), 0U);
BOOL enum_result = TRUE;
for (int device_index = 0;; ++device_index) {
device.cb = sizeof(device);
enum_result = EnumDisplayDevicesW(NULL, device_index, &device, 0);
// |enum_result| is 0 if we have enumerated all devices.
if (!enum_result)
// We only care about active displays.
if (!(device.StateFlags & DISPLAY_DEVICE_ACTIVE))
screens->push_back({device_index, std::string()});
if (device_names) {
return true;
bool IsScreenValid(DesktopCapturer::SourceId screen, std::wstring* device_key) {
if (screen == kFullDesktopScreenId) {
*device_key = L"";
return true;
device.cb = sizeof(device);
BOOL enum_result = EnumDisplayDevicesW(NULL, screen, &device, 0);
if (enum_result)
*device_key = device.DeviceKey;
return !!enum_result;
DesktopRect GetFullscreenRect() {
return DesktopRect::MakeXYWH(GetSystemMetrics(SM_XVIRTUALSCREEN),
DesktopRect GetScreenRect(DesktopCapturer::SourceId screen,
const std::wstring& device_key) {
if (screen == kFullDesktopScreenId) {
return GetFullscreenRect();
device.cb = sizeof(device);
BOOL result = EnumDisplayDevicesW(NULL, screen, &device, 0);
if (!result)
return DesktopRect();
// Verifies the device index still maps to the same display device, to make
// sure we are capturing the same device when devices are added or removed.
// DeviceKey is documented as reserved, but it actually contains the registry
// key for the device and is unique for each monitor, while DeviceID is not.
if (device_key != device.DeviceKey)
return DesktopRect();
DEVMODEW device_mode;
device_mode.dmSize = sizeof(device_mode);
device_mode.dmDriverExtra = 0;
result = EnumDisplaySettingsExW(device.DeviceName, ENUM_CURRENT_SETTINGS,
&device_mode, 0);
if (!result)
return DesktopRect();
return DesktopRect::MakeXYWH(
device_mode.dmPosition.x, device_mode.dmPosition.y,
device_mode.dmPelsWidth, device_mode.dmPelsHeight);
} // namespace webrtc