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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/linux/desktop_display_info_loader_x11.h"
#include <algorithm>
#include <memory>
#include "base/memory/raw_ptr.h"
#include "remoting/base/constants.h"
#include "remoting/base/logging.h"
#include "remoting/host/linux/x11_display_util.h"
#include "ui/base/x/x11_display_util.h"
#include "ui/base/x/x11_util.h"
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/event.h"
#include "ui/gfx/x/future.h"
#include "ui/gfx/x/randr.h"
#include "ui/gfx/x/window_event_manager.h"
namespace remoting {
namespace {
// Monitors were added in XRANDR 1.5.
constexpr std::pair<uint32_t, uint32_t> kMinRandrVersion{1, 5};
} // namespace
DesktopDisplayInfoLoaderX11::DesktopDisplayInfoLoaderX11() = default;
DesktopDisplayInfoLoaderX11::~DesktopDisplayInfoLoaderX11() {
if (connection_) {
connection_->RemoveEventObserver(this);
}
}
void DesktopDisplayInfoLoaderX11::Init() {
connection_ = x11::Connection::Get();
connection_->AddEventObserver(this);
randr_ = &connection_->randr();
if (!randr_->present()) {
HOST_LOG << "No XRANDR extension found.";
return;
}
auto randr_version = connection_->randr_version();
if (randr_version < kMinRandrVersion) {
HOST_LOG << "XRANDR version (" << randr_version.first << ", "
<< randr_version.second << ") is too old.";
return;
}
root_window_events_ = connection_->ScopedSelectEvent(
ui::GetX11RootWindow(), x11::EventMask::StructureNotify);
auto randr_event_mask =
x11::RandR::NotifyMask::ScreenChange | x11::RandR::NotifyMask::CrtcChange;
randr_->SelectInput({ui::GetX11RootWindow(), randr_event_mask});
LoadMonitors();
}
DesktopDisplayInfo DesktopDisplayInfoLoaderX11::GetCurrentDisplayInfo() {
DesktopDisplayInfo result;
for (const auto& monitor : monitors_) {
std::string display_name;
auto reply = connection_->GetAtomName({monitor.name}).Sync();
if (reply) {
display_name = reply->name;
}
result.AddDisplay({
// webrtc::ScreenCapturerX11 uses the |name| Atom as the monitor ID.
static_cast<int32_t>(monitor.name),
monitor.x,
monitor.y,
monitor.width,
monitor.height,
// Hard-code the default DPI instead of calculating it from the
// monitor's resolution and physical size. This avoids an issue where
// the website pre-multiplies the ClientResolution sizes by the host's
// pixels/DIPs ratio, sometimes leading to a feedback loop of
// ever-increasing resizes.
//
// TODO: crbug.com/40941037 - Change this back to
// GetMonitorDpi(monitor).x() when the website issue has been
// addressed.
kDefaultDpi,
/* bpp */ 24,
/* is_default */ static_cast<bool>(monitor.primary),
display_name,
});
}
return result;
}
void DesktopDisplayInfoLoaderX11::OnEvent(const x11::Event& xevent) {
const auto* configure_notify = xevent.As<x11::ConfigureNotifyEvent>();
const auto* screen_change = xevent.As<x11::RandR::ScreenChangeNotifyEvent>();
const auto* notify = xevent.As<x11::RandR::NotifyEvent>();
if (configure_notify) {
HOST_LOG << "Got X11 ConfigureNotify event.";
} else if (screen_change) {
HOST_LOG << "Got RANDR ScreenChange event.";
} else if (notify) {
HOST_LOG << "Got RANDR Notify event.";
} else {
// Unhandled event received on root window, ignore.
return;
}
LoadMonitors();
}
void DesktopDisplayInfoLoaderX11::LoadMonitors() {
if (connection_->randr_version() < kMinRandrVersion) {
return;
}
auto reply = randr_->GetMonitors({ui::GetX11RootWindow()}).Sync();
if (reply) {
monitors_ = std::move(reply->monitors);
} else {
LOG(ERROR) << "RRGetMonitors request failed.";
}
}
} // namespace remoting
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