ui/views/widget/desktop_aura/desktop_screen_x11.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/widget/desktop_aura/desktop_screen_x11.h"
   6
   7 #include <X11/extensions/Xrandr.h>
   8 #include <X11/Xlib.h>
   9
  10 // It clashes with out RootWindow.
  11 #undef RootWindow
  12
  13 #include "base/logging.h"
  14 #include "base/trace_event/trace_event.h"
  15 #include "ui/aura/window.h"
  16 #include "ui/aura/window_event_dispatcher.h"
  17 #include "ui/aura/window_tree_host.h"
  18 #include "ui/base/layout.h"
  19 #include "ui/display/util/display_util.h"
  20 #include "ui/display/util/x11/edid_parser_x11.h"
  21 #include "ui/events/platform/platform_event_source.h"
  22 #include "ui/gfx/display.h"
  23 #include "ui/gfx/geometry/point_conversions.h"
  24 #include "ui/gfx/geometry/size_conversions.h"
  25 #include "ui/gfx/native_widget_types.h"
  26 #include "ui/gfx/screen.h"
  27 #include "ui/gfx/x/x11_types.h"
  28 #include "ui/views/linux_ui/linux_ui.h"
  29 #include "ui/views/widget/desktop_aura/desktop_screen.h"
  30 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
  31 #include "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
  32
  33 namespace {
  34
  35 // The delay to perform configuration after RRNotify.  See the comment
  36 // in |Dispatch()|.
  37 const int64 kConfigureDelayMs = 500;
  38
  39 double GetDeviceScaleFactor() {
  40   float device_scale_factor = 1.0f;
  41   if (views::LinuxUI::instance())
  42     device_scale_factor =
  43       views::LinuxUI::instance()->GetDeviceScaleFactor();
  44   return device_scale_factor;
  45 }
  46
  47 gfx::Point PixelToDIPPoint(const gfx::Point& pixel_point) {
  48   return ToFlooredPoint(ScalePoint(pixel_point, 1.0f / GetDeviceScaleFactor()));
  49 }
  50
  51 gfx::Point DIPToPixelPoint(const gfx::Point& dip_point) {
  52   return ToFlooredPoint(gfx::ScalePoint(dip_point, GetDeviceScaleFactor()));
  53 }
  54
  55 std::vector<gfx::Display> GetFallbackDisplayList() {
  56   ::XDisplay* display = gfx::GetXDisplay();
  57   ::Screen* screen = DefaultScreenOfDisplay(display);
  58   int width = WidthOfScreen(screen);
  59   int height = HeightOfScreen(screen);
  60   gfx::Size physical_size(WidthMMOfScreen(screen), HeightMMOfScreen(screen));
  61
  62   gfx::Rect bounds_in_pixels(0, 0, width, height);
  63   gfx::Display gfx_display(0, bounds_in_pixels);
  64   if (!gfx::Display::HasForceDeviceScaleFactor() &&
  65       !ui::IsDisplaySizeBlackListed(physical_size)) {
  66     const float device_scale_factor = GetDeviceScaleFactor();
  67     DCHECK_LE(1.0f, device_scale_factor);
  68     gfx_display.SetScaleAndBounds(device_scale_factor, bounds_in_pixels);
  69   }
  70
  71   return std::vector<gfx::Display>(1, gfx_display);
  72 }
  73
  74 }  // namespace
  75
  76 namespace views {
  77
  78 ////////////////////////////////////////////////////////////////////////////////
  79 // DesktopScreenX11, public:
  80
  81 DesktopScreenX11::DesktopScreenX11()
  82     : xdisplay_(gfx::GetXDisplay()),
  83       x_root_window_(DefaultRootWindow(xdisplay_)),
  84       has_xrandr_(false),
  85       xrandr_event_base_(0) {
  86   // We only support 1.3+. There were library changes before this and we should
  87   // use the new interface instead of the 1.2 one.
  88   int randr_version_major = 0;
  89   int randr_version_minor = 0;
  90   has_xrandr_ = XRRQueryVersion(
  91         xdisplay_, &randr_version_major, &randr_version_minor) &&
  92       randr_version_major == 1 &&
  93       randr_version_minor >= 3;
  94
  95   if (has_xrandr_) {
  96     int error_base_ignored = 0;
  97     XRRQueryExtension(xdisplay_, &xrandr_event_base_, &error_base_ignored);
  98
  99     if (ui::PlatformEventSource::GetInstance())
 100       ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
 101     XRRSelectInput(xdisplay_,
 102                    x_root_window_,
 103                    RRScreenChangeNotifyMask |
 104                    RROutputChangeNotifyMask |
 105                    RRCrtcChangeNotifyMask);
 106
 107     displays_ = BuildDisplaysFromXRandRInfo();
 108   } else {
 109     displays_ = GetFallbackDisplayList();
 110   }
 111 }
 112
 113 DesktopScreenX11::~DesktopScreenX11() {
 114   if (has_xrandr_ && ui::PlatformEventSource::GetInstance())
 115     ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
 116 }
 117
 118 ////////////////////////////////////////////////////////////////////////////////
 119 // DesktopScreenX11, gfx::Screen implementation:
 120
 121 gfx::Point DesktopScreenX11::GetCursorScreenPoint() {
 122   TRACE_EVENT0("views", "DesktopScreenX11::GetCursorScreenPoint()");
 123
 124   XDisplay* display = gfx::GetXDisplay();
 125
 126   ::Window root, child;
 127   int root_x, root_y, win_x, win_y;
 128   unsigned int mask;
 129   XQueryPointer(display,
 130                 DefaultRootWindow(display),
 131                 &root,
 132                 &child,
 133                 &root_x,
 134                 &root_y,
 135                 &win_x,
 136                 &win_y,
 137                 &mask);
 138
 139   return PixelToDIPPoint(gfx::Point(root_x, root_y));
 140 }
 141
 142 gfx::NativeWindow DesktopScreenX11::GetWindowUnderCursor() {
 143   return GetWindowAtScreenPoint(GetCursorScreenPoint());
 144 }
 145
 146 gfx::NativeWindow DesktopScreenX11::GetWindowAtScreenPoint(
 147     const gfx::Point& point) {
 148   X11TopmostWindowFinder finder;
 149   return finder.FindLocalProcessWindowAt(
 150       DIPToPixelPoint(point), std::set<aura::Window*>());
 151 }
 152
 153 int DesktopScreenX11::GetNumDisplays() const {
 154   return displays_.size();
 155 }
 156
 157 std::vector<gfx::Display> DesktopScreenX11::GetAllDisplays() const {
 158   return displays_;
 159 }
 160
 161 gfx::Display DesktopScreenX11::GetDisplayNearestWindow(
 162     gfx::NativeView window) const {
 163   if (!window)
 164     return GetPrimaryDisplay();
 165
 166   // Getting screen bounds here safely is hard.
 167   //
 168   // You'd think we'd be able to just call window->GetBoundsInScreen(), but we
 169   // can't because |window| (and the associated WindowEventDispatcher*) can be
 170   // partially initialized at this point; WindowEventDispatcher initializations
 171   // call through into GetDisplayNearestWindow(). But the X11 resources are
 172   // created before we create the aura::WindowEventDispatcher. So we ask what
 173   // the DRWHX11 believes the window bounds are instead of going through the
 174   // aura::Window's screen bounds.
 175   aura::WindowTreeHost* host = window->GetHost();
 176   if (host) {
 177     DesktopWindowTreeHostX11* rwh = DesktopWindowTreeHostX11::GetHostForXID(
 178         host->GetAcceleratedWidget());
 179     if (rwh)
 180       return GetDisplayMatching(rwh->GetX11RootWindowBounds());
 181   }
 182
 183   return GetPrimaryDisplay();
 184 }
 185
 186 gfx::Display DesktopScreenX11::GetDisplayNearestPoint(
 187     const gfx::Point& point) const {
 188   for (std::vector<gfx::Display>::const_iterator it = displays_.begin();
 189        it != displays_.end(); ++it) {
 190     if (it->bounds().Contains(point))
 191       return *it;
 192   }
 193
 194   return GetPrimaryDisplay();
 195 }
 196
 197 gfx::Display DesktopScreenX11::GetDisplayMatching(
 198     const gfx::Rect& match_rect) const {
 199   int max_area = 0;
 200   const gfx::Display* matching = NULL;
 201   for (std::vector<gfx::Display>::const_iterator it = displays_.begin();
 202        it != displays_.end(); ++it) {
 203     gfx::Rect intersect = gfx::IntersectRects(it->bounds(), match_rect);
 204     int area = intersect.width() * intersect.height();
 205     if (area > max_area) {
 206       max_area = area;
 207       matching = &*it;
 208     }
 209   }
 210   // Fallback to the primary display if there is no matching display.
 211   return matching ? *matching : GetPrimaryDisplay();
 212 }
 213
 214 gfx::Display DesktopScreenX11::GetPrimaryDisplay() const {
 215   return displays_.front();
 216 }
 217
 218 void DesktopScreenX11::AddObserver(gfx::DisplayObserver* observer) {
 219   change_notifier_.AddObserver(observer);
 220 }
 221
 222 void DesktopScreenX11::RemoveObserver(gfx::DisplayObserver* observer) {
 223   change_notifier_.RemoveObserver(observer);
 224 }
 225
 226 bool DesktopScreenX11::CanDispatchEvent(const ui::PlatformEvent& event) {
 227   return event->type - xrandr_event_base_ == RRScreenChangeNotify ||
 228          event->type - xrandr_event_base_ == RRNotify;
 229 }
 230
 231 uint32_t DesktopScreenX11::DispatchEvent(const ui::PlatformEvent& event) {
 232   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
 233     // Pass the event through to xlib.
 234     XRRUpdateConfiguration(event);
 235   } else if (event->type - xrandr_event_base_ == RRNotify) {
 236     // There's some sort of observer dispatch going on here, but I don't think
 237     // it's the screen's?
 238     if (configure_timer_.get() && configure_timer_->IsRunning()) {
 239       configure_timer_->Reset();
 240     } else {
 241       configure_timer_.reset(new base::OneShotTimer<DesktopScreenX11>());
 242       configure_timer_->Start(
 243           FROM_HERE,
 244           base::TimeDelta::FromMilliseconds(kConfigureDelayMs),
 245           this,
 246           &DesktopScreenX11::ConfigureTimerFired);
 247     }
 248   } else {
 249     NOTREACHED();
 250   }
 251
 252   return ui::POST_DISPATCH_NONE;
 253 }
 254
 255 ////////////////////////////////////////////////////////////////////////////////
 256 // DesktopScreenX11, private:
 257
 258 DesktopScreenX11::DesktopScreenX11(
 259     const std::vector<gfx::Display>& test_displays)
 260     : xdisplay_(gfx::GetXDisplay()),
 261       x_root_window_(DefaultRootWindow(xdisplay_)),
 262       has_xrandr_(false),
 263       xrandr_event_base_(0),
 264       displays_(test_displays) {
 265 }
 266
 267 std::vector<gfx::Display> DesktopScreenX11::BuildDisplaysFromXRandRInfo() {
 268   std::vector<gfx::Display> displays;
 269   gfx::XScopedPtr<
 270       XRRScreenResources,
 271       gfx::XObjectDeleter<XRRScreenResources, void, XRRFreeScreenResources>>
 272       resources(XRRGetScreenResourcesCurrent(xdisplay_, x_root_window_));
 273   if (!resources) {
 274     LOG(ERROR) << "XRandR returned no displays. Falling back to Root Window.";
 275     return GetFallbackDisplayList();
 276   }
 277
 278   bool has_work_area = false;
 279   gfx::Rect work_area_in_pixels;
 280   std::vector<int> value;
 281   if (ui::GetIntArrayProperty(x_root_window_, "_NET_WORKAREA", &value) &&
 282       value.size() >= 4) {
 283     work_area_in_pixels = gfx::Rect(value[0], value[1], value[2], value[3]);
 284     has_work_area = true;
 285   }
 286
 287   // As per-display scale factor is not supported right now,
 288   // the X11 root window's scale factor is always used.
 289   const float device_scale_factor = GetDeviceScaleFactor();
 290   for (int i = 0; i < resources->noutput; ++i) {
 291     RROutput output_id = resources->outputs[i];
 292     gfx::XScopedPtr<XRROutputInfo,
 293                     gfx::XObjectDeleter<XRROutputInfo, void, XRRFreeOutputInfo>>
 294         output_info(XRRGetOutputInfo(xdisplay_, resources.get(), output_id));
 295
 296     bool is_connected = (output_info->connection == RR_Connected);
 297     if (!is_connected)
 298       continue;
 299
 300     if (output_info->crtc) {
 301       gfx::XScopedPtr<XRRCrtcInfo,
 302                       gfx::XObjectDeleter<XRRCrtcInfo, void, XRRFreeCrtcInfo>>
 303           crtc(XRRGetCrtcInfo(xdisplay_, resources.get(), output_info->crtc));
 304
 305       int64 display_id = -1;
 306       if (!ui::GetDisplayId(output_id, static_cast<uint8>(i), &display_id)) {
 307         // It isn't ideal, but if we can't parse the EDID data, fallback on the
 308         // display number.
 309         display_id = i;
 310       }
 311
 312       gfx::Rect crtc_bounds(crtc->x, crtc->y, crtc->width, crtc->height);
 313       gfx::Display display(display_id, crtc_bounds);
 314
 315       if (!gfx::Display::HasForceDeviceScaleFactor()) {
 316         display.SetScaleAndBounds(device_scale_factor, crtc_bounds);
 317       }
 318
 319       if (has_work_area) {
 320         gfx::Rect intersection_in_pixels = crtc_bounds;
 321         intersection_in_pixels.Intersect(work_area_in_pixels);
 322         // SetScaleAndBounds() above does the conversion from pixels to DIP for
 323         // us, but set_work_area does not, so we need to do it here.
 324         display.set_work_area(gfx::Rect(
 325             gfx::ToFlooredPoint(
 326                 gfx::ScalePoint(intersection_in_pixels.origin(),
 327                                 1.0f / display.device_scale_factor())),
 328             gfx::ToFlooredSize(
 329                 gfx::ScaleSize(intersection_in_pixels.size(),
 330                                1.0f / display.device_scale_factor()))));
 331       }
 332
 333       switch (crtc->rotation) {
 334         case RR_Rotate_0:
 335           display.set_rotation(gfx::Display::ROTATE_0);
 336           break;
 337         case RR_Rotate_90:
 338           display.set_rotation(gfx::Display::ROTATE_90);
 339           break;
 340         case RR_Rotate_180:
 341           display.set_rotation(gfx::Display::ROTATE_180);
 342           break;
 343         case RR_Rotate_270:
 344           display.set_rotation(gfx::Display::ROTATE_270);
 345           break;
 346       }
 347
 348       displays.push_back(display);
 349     }
 350   }
 351
 352   if (displays.empty())
 353     return GetFallbackDisplayList();
 354
 355   return displays;
 356 }
 357
 358 void DesktopScreenX11::ConfigureTimerFired() {
 359   std::vector<gfx::Display> old_displays = displays_;
 360   displays_ = BuildDisplaysFromXRandRInfo();
 361
 362   change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
 363 }
 364
 365 ////////////////////////////////////////////////////////////////////////////////
 366
 367 gfx::Screen* CreateDesktopScreen() {
 368   return new DesktopScreenX11;
 369 }
 370
 371 }  // namespace views