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/*
* Copyright (c) 2013 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/linux/x11/shared_x_display.h"
#include <X11/Xlib.h>
#include <X11/extensions/XTest.h>
#include <algorithm>
#include "absl/strings/string_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
SharedXDisplay::SharedXDisplay(Display* display) : display_(display) {
RTC_DCHECK(display_);
}
SharedXDisplay::~SharedXDisplay() {
RTC_DCHECK(event_handlers_.empty());
XCloseDisplay(display_);
}
// static
scoped_refptr<SharedXDisplay> SharedXDisplay::Create(
absl::string_view display_name) {
Display* display = XOpenDisplay(
display_name.empty() ? nullptr : std::string(display_name).c_str());
if (!display) {
RTC_LOG(LS_ERROR) << "Unable to open display";
return nullptr;
}
return scoped_refptr<SharedXDisplay>(new SharedXDisplay(display));
}
// static
scoped_refptr<SharedXDisplay> SharedXDisplay::CreateDefault() {
return Create(std::string());
}
void SharedXDisplay::AddEventHandler(int type, XEventHandler* handler) {
MutexLock lock(&mutex_);
event_handlers_[type].push_back(handler);
}
void SharedXDisplay::RemoveEventHandler(int type, XEventHandler* handler) {
MutexLock lock(&mutex_);
EventHandlersMap::iterator handlers = event_handlers_.find(type);
if (handlers == event_handlers_.end())
return;
std::vector<XEventHandler*>::iterator new_end =
std::remove(handlers->second.begin(), handlers->second.end(), handler);
handlers->second.erase(new_end, handlers->second.end());
// Check if no handlers left for this event.
if (handlers->second.empty())
event_handlers_.erase(handlers);
}
void SharedXDisplay::ProcessPendingXEvents() {
// Hold reference to `this` to prevent it from being destroyed while
// processing events.
scoped_refptr<SharedXDisplay> self(this);
// Protect access to `event_handlers_` after incrementing the refcount for
// `this` to ensure the instance is still valid when the lock is acquired.
MutexLock lock(&mutex_);
// Find the number of events that are outstanding "now." We don't just loop
// on XPending because we want to guarantee this terminates.
int events_to_process = XPending(display());
XEvent e;
for (int i = 0; i < events_to_process; i++) {
XNextEvent(display(), &e);
EventHandlersMap::iterator handlers = event_handlers_.find(e.type);
if (handlers == event_handlers_.end())
continue;
for (std::vector<XEventHandler*>::iterator it = handlers->second.begin();
it != handlers->second.end(); ++it) {
if ((*it)->HandleXEvent(e))
break;
}
}
}
void SharedXDisplay::IgnoreXServerGrabs() {
int test_event_base = 0;
int test_error_base = 0;
int major = 0;
int minor = 0;
if (XTestQueryExtension(display(), &test_event_base, &test_error_base, &major,
&minor)) {
XTestGrabControl(display(), true);
}
}
} // namespace webrtc
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