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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/display/native_display_event_dispatcher_x11.h"
#include <X11/extensions/Xrandr.h>
namespace chromeos {
NativeDisplayEventDispatcherX11::NativeDisplayEventDispatcherX11(
NativeDisplayDelegateX11::HelperDelegate* delegate, int xrandr_event_base)
: delegate_(delegate),
xrandr_event_base_(xrandr_event_base) {}
NativeDisplayEventDispatcherX11::~NativeDisplayEventDispatcherX11() {}
uint32_t NativeDisplayEventDispatcherX11::Dispatch(
const base::NativeEvent& event) {
if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
VLOG(1) << "Received RRScreenChangeNotify event";
delegate_->UpdateXRandRConfiguration(event);
return POST_DISPATCH_PERFORM_DEFAULT;
}
// Bail out early for everything except RRNotify_OutputChange events
// about an output getting connected or disconnected.
if (event->type - xrandr_event_base_ != RRNotify)
return POST_DISPATCH_PERFORM_DEFAULT;
const XRRNotifyEvent* notify_event = reinterpret_cast<XRRNotifyEvent*>(event);
if (notify_event->subtype != RRNotify_OutputChange)
return POST_DISPATCH_PERFORM_DEFAULT;
const XRROutputChangeNotifyEvent* output_change_event =
reinterpret_cast<XRROutputChangeNotifyEvent*>(event);
const int action = output_change_event->connection;
if (action != RR_Connected && action != RR_Disconnected)
return POST_DISPATCH_PERFORM_DEFAULT;
const bool connected = (action == RR_Connected);
VLOG(1) << "Received RRNotify_OutputChange event:"
<< " output=" << output_change_event->output
<< " crtc=" << output_change_event->crtc
<< " mode=" << output_change_event->mode
<< " action=" << (connected ? "connected" : "disconnected");
bool found_changed_output = false;
const std::vector<OutputConfigurator::OutputSnapshot>& cached_outputs =
delegate_->GetCachedOutputs();
for (std::vector<OutputConfigurator::OutputSnapshot>::const_iterator
it = cached_outputs.begin();
it != cached_outputs.end(); ++it) {
if (it->output == output_change_event->output) {
if (connected && it->crtc == output_change_event->crtc &&
it->current_mode == output_change_event->mode) {
VLOG(1) << "Ignoring event describing already-cached state";
return POST_DISPATCH_PERFORM_DEFAULT;
}
found_changed_output = true;
break;
}
}
if (!connected && !found_changed_output) {
VLOG(1) << "Ignoring event describing already-disconnected output";
return POST_DISPATCH_PERFORM_DEFAULT;
}
delegate_->NotifyDisplayObservers();
return POST_DISPATCH_PERFORM_DEFAULT;
}
} // namespace chromeos
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