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// Copyright (c) 2012 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 "ui/aura/monitor_change_observer_x11.h"
#include <algorithm>
#include <map>
#include <set>
#include <vector>
#include <X11/extensions/Xrandr.h>
#include "base/message_pump_aurax11.h"
#include "ui/aura/dispatcher_linux.h"
#include "ui/aura/env.h"
#include "ui/aura/monitor_manager.h"
#include "ui/compositor/dip_util.h"
#include "ui/gfx/display.h"
namespace aura {
namespace internal {
namespace {
// The DPI threshold to detect high density screen.
// Higher DPI than this will use device_scale_factor=2.
// Note: This value has to be kept in sync with the mouse/touchpad driver
// which controls mouse pointer acceleration. If you need to update this value,
// please update the bug (crosbug.com/31628) first and make sure that the
// driver will use the same value.
// This value also has to be kept in sync with the value in
// chromeos/monitor/output_configurator.cc. See crbug.com/130188
const unsigned int kHighDensityDIPThreshold = 160;
// 1 inch in mm.
const float kInchInMm = 25.4f;
XRRModeInfo* FindMode(XRRScreenResources* screen_resources, XID current_mode) {
for (int m = 0; m < screen_resources->nmode; m++) {
XRRModeInfo *mode = &screen_resources->modes[m];
if (mode->id == current_mode)
return mode;
}
return NULL;
}
bool CompareDisplayY(const gfx::Display& lhs, const gfx::Display& rhs) {
return lhs.bounds_in_pixel().y() < rhs.bounds_in_pixel().y();
}
} // namespace
MonitorChangeObserverX11::MonitorChangeObserverX11()
: xdisplay_(base::MessagePumpAuraX11::GetDefaultXDisplay()),
x_root_window_(DefaultRootWindow(xdisplay_)),
xrandr_event_base_(0) {
int error_base_ignored;
XRRQueryExtension(xdisplay_, &xrandr_event_base_, &error_base_ignored);
static_cast<DispatcherLinux*>(Env::GetInstance()->GetDispatcher())->
AddDispatcherForRootWindow(this);
}
MonitorChangeObserverX11::~MonitorChangeObserverX11() {
static_cast<DispatcherLinux*>(Env::GetInstance()->GetDispatcher())->
RemoveDispatcherForRootWindow(this);
}
bool MonitorChangeObserverX11::Dispatch(const base::NativeEvent& event) {
if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
NotifyDisplayChange();
}
return true;
}
void MonitorChangeObserverX11::NotifyDisplayChange() {
if (!MonitorManager::use_fullscreen_host_window())
return; // Use the default monitor that monitor manager determined.
XRRScreenResources* screen_resources =
XRRGetScreenResources(xdisplay_, x_root_window_);
std::map<XID, XRRCrtcInfo*> crtc_info_map;
for (int c = 0; c < screen_resources->ncrtc; c++) {
XID crtc_id = screen_resources->crtcs[c];
XRRCrtcInfo *crtc_info =
XRRGetCrtcInfo(xdisplay_, screen_resources, crtc_id);
crtc_info_map[crtc_id] = crtc_info;
}
std::vector<gfx::Display> displays;
std::set<int> y_coords;
for (int o = 0; o < screen_resources->noutput; o++) {
XRROutputInfo *output_info =
XRRGetOutputInfo(xdisplay_,
screen_resources,
screen_resources->outputs[o]);
if (output_info->connection != RR_Connected) {
XRRFreeOutputInfo(output_info);
continue;
}
XRRCrtcInfo* crtc_info = crtc_info_map[output_info->crtc];
if (!crtc_info) {
LOG(WARNING) << "Crtc not found for output";
continue;
}
XRRModeInfo* mode = FindMode(screen_resources, crtc_info->mode);
CHECK(mode);
// Mirrored monitors have the same y coordinates.
if (y_coords.find(crtc_info->y) != y_coords.end())
continue;
// TODO(oshima): Create unique ID for the monitor.
displays.push_back(gfx::Display(
0,
gfx::Rect(crtc_info->x, crtc_info->y, mode->width, mode->height)));
float device_scale_factor = 1.0f;
if (output_info->mm_width > 0 &&
(kInchInMm * mode->width / output_info->mm_width) >
kHighDensityDIPThreshold) {
device_scale_factor = 2.0f;
}
displays.back().set_device_scale_factor(device_scale_factor);
y_coords.insert(crtc_info->y);
XRRFreeOutputInfo(output_info);
}
// Free all allocated resources.
for (std::map<XID, XRRCrtcInfo*>::const_iterator iter = crtc_info_map.begin();
iter != crtc_info_map.end(); ++iter) {
XRRFreeCrtcInfo(iter->second);
}
XRRFreeScreenResources(screen_resources);
// PowerManager lays out the outputs vertically. Sort them by Y
// coordinates.
std::sort(displays.begin(), displays.end(), CompareDisplayY);
// TODO(oshima): Assisgn index as ID for now. Use unique ID.
int id = 0;
for (std::vector<gfx::Display>::iterator iter = displays.begin();
iter != displays.end(); ++iter, ++id)
(*iter).set_id(id);
Env::GetInstance()->monitor_manager()->OnNativeMonitorsChanged(displays);
}
} // namespace internal
} // namespace aura
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