blob: 4eeee3210664d90cab19d83304d4d6f88ec49cce [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/mac/desktop_configuration_monitor.h"
#include "modules/desktop_capture/mac/desktop_configuration.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/event_wrapper.h"
namespace webrtc {
// The amount of time allowed for displays to reconfigure.
static const int64_t kDisplayConfigurationEventTimeoutMs = 10 * 1000;
DesktopConfigurationMonitor::DesktopConfigurationMonitor()
: display_configuration_capture_event_(EventWrapper::Create()) {
CGError err = CGDisplayRegisterReconfigurationCallback(
DesktopConfigurationMonitor::DisplaysReconfiguredCallback, this);
if (err != kCGErrorSuccess) {
RTC_LOG(LS_ERROR) << "CGDisplayRegisterReconfigurationCallback " << err;
abort();
}
display_configuration_capture_event_->Set();
desktop_configuration_ = MacDesktopConfiguration::GetCurrent(
MacDesktopConfiguration::TopLeftOrigin);
}
DesktopConfigurationMonitor::~DesktopConfigurationMonitor() {
CGError err = CGDisplayRemoveReconfigurationCallback(
DesktopConfigurationMonitor::DisplaysReconfiguredCallback, this);
if (err != kCGErrorSuccess)
RTC_LOG(LS_ERROR) << "CGDisplayRemoveReconfigurationCallback " << err;
}
void DesktopConfigurationMonitor::Lock() {
if (!display_configuration_capture_event_->Wait(
kDisplayConfigurationEventTimeoutMs)) {
RTC_LOG_F(LS_ERROR) << "Event wait timed out.";
abort();
}
}
void DesktopConfigurationMonitor::Unlock() {
display_configuration_capture_event_->Set();
}
// static
void DesktopConfigurationMonitor::DisplaysReconfiguredCallback(
CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags,
void *user_parameter) {
DesktopConfigurationMonitor* monitor =
reinterpret_cast<DesktopConfigurationMonitor*>(user_parameter);
monitor->DisplaysReconfigured(display, flags);
}
void DesktopConfigurationMonitor::DisplaysReconfigured(
CGDirectDisplayID display,
CGDisplayChangeSummaryFlags flags) {
if (flags & kCGDisplayBeginConfigurationFlag) {
if (reconfiguring_displays_.empty()) {
// If this is the first display to start reconfiguring then wait on
// |display_configuration_capture_event_| to block the capture thread
// from accessing display memory until the reconfiguration completes.
if (!display_configuration_capture_event_->Wait(
kDisplayConfigurationEventTimeoutMs)) {
RTC_LOG_F(LS_ERROR) << "Event wait timed out.";
abort();
}
}
reconfiguring_displays_.insert(display);
} else {
reconfiguring_displays_.erase(display);
if (reconfiguring_displays_.empty()) {
desktop_configuration_ = MacDesktopConfiguration::GetCurrent(
MacDesktopConfiguration::TopLeftOrigin);
display_configuration_capture_event_->Set();
}
}
}
} // namespace webrtc