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/*
* Copyright (c) 2017 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/display_configuration_monitor.h"
#include <windows.h>
#include "modules/desktop_capture/win/screen_capture_utils.h"
#include "rtc_base/logging.h"
namespace webrtc {
bool DisplayConfigurationMonitor::IsChanged(
DesktopCapturer::SourceId source_id) {
DesktopRect rect = GetFullscreenRect();
DesktopVector dpi = GetDpiForSourceId(source_id);
if (!initialized_) {
initialized_ = true;
rect_ = rect;
source_dpis_.emplace(source_id, std::move(dpi));
return false;
}
if (!source_dpis_.contains(source_id)) {
// If this is the first time we've seen this source_id, use the current DPI
// so the monitor does not indicate a change and possibly get reset.
source_dpis_.emplace(source_id, dpi);
}
bool has_changed = false;
if (!rect.equals(rect_) || !source_dpis_.at(source_id).equals(dpi)) {
has_changed = true;
rect_ = rect;
source_dpis_.emplace(source_id, std::move(dpi));
}
return has_changed;
}
void DisplayConfigurationMonitor::Reset() {
initialized_ = false;
source_dpis_.clear();
rect_ = {};
}
DesktopVector DisplayConfigurationMonitor::GetDpiForSourceId(
DesktopCapturer::SourceId source_id) {
HMONITOR monitor = 0;
if (source_id == kFullDesktopScreenId) {
// Get a handle to the primary monitor when capturing the full desktop.
monitor = MonitorFromPoint({0, 0}, MONITOR_DEFAULTTOPRIMARY);
} else if (!GetHmonitorFromDeviceIndex(source_id, &monitor)) {
RTC_LOG(LS_WARNING) << "GetHmonitorFromDeviceIndex failed.";
}
return GetDpiForMonitor(monitor);
}
} // namespace webrtc
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