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/debug/trace_event.h"
  14 #include "base/logging.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/native_widget_types.h"
  24 #include "ui/gfx/screen.h"
  25 #include "ui/gfx/x/x11_types.h"
  26 #include "ui/views/widget/desktop_aura/desktop_screen.h"
  27 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
  28 #include "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
  29
  30 namespace {
  31
  32 // The delay to perform configuration after RRNotify.  See the comment
  33 // in |Dispatch()|.
  34 const int64 kConfigureDelayMs = 500;
  35
  36 // TODO(oshima): Consider using gtk-xft-dpi instead.
  37 float GetDeviceScaleFactor(int screen_pixels, int screen_mm) {
  38   const int kCSSDefaultDPI = 96;
  39   const float kInchInMm = 25.4f;
  40
  41   float screen_inches = screen_mm / kInchInMm;
  42   float screen_dpi = screen_pixels / screen_inches;
  43   float scale = screen_dpi / kCSSDefaultDPI;
  44
  45   return ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(scale));
  46 }
  47
  48 std::vector<gfx::Display> GetFallbackDisplayList() {
  49   ::XDisplay* display = gfx::GetXDisplay();
  50   ::Screen* screen = DefaultScreenOfDisplay(display);
  51   int width = WidthOfScreen(screen);
  52   int height = HeightOfScreen(screen);
  53   gfx::Size physical_size(WidthMMOfScreen(screen), HeightMMOfScreen(screen));
  54
  55   gfx::Rect bounds_in_pixels(0, 0, width, height);
  56   gfx::Display gfx_display(0, bounds_in_pixels);
  57   if (!gfx::Display::HasForceDeviceScaleFactor() &&
  58       !ui::IsDisplaySizeBlackListed(physical_size)) {
  59     float device_scale_factor = GetDeviceScaleFactor(
  60         width, physical_size.width());
  61     DCHECK_LE(1.0f, device_scale_factor);
  62     gfx_display.SetScaleAndBounds(device_scale_factor, bounds_in_pixels);
  63   }
  64
  65   return std::vector<gfx::Display>(1, gfx_display);
  66 }
  67
  68 }  // namespace
  69
  70 namespace views {
  71
  72 ////////////////////////////////////////////////////////////////////////////////
  73 // DesktopScreenX11, public:
  74
  75 DesktopScreenX11::DesktopScreenX11()
  76     : xdisplay_(gfx::GetXDisplay()),
  77       x_root_window_(DefaultRootWindow(xdisplay_)),
  78       has_xrandr_(false),
  79       xrandr_event_base_(0) {
  80   // We only support 1.3+. There were library changes before this and we should
  81   // use the new interface instead of the 1.2 one.
  82   int randr_version_major = 0;
  83   int randr_version_minor = 0;
  84   has_xrandr_ = XRRQueryVersion(
  85         xdisplay_, &randr_version_major, &randr_version_minor) &&
  86       randr_version_major == 1 &&
  87       randr_version_minor >= 3;
  88
  89   if (has_xrandr_) {
  90     int error_base_ignored = 0;
  91     XRRQueryExtension(xdisplay_, &xrandr_event_base_, &error_base_ignored);
  92
  93     if (ui::PlatformEventSource::GetInstance())
  94       ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
  95     XRRSelectInput(xdisplay_,
  96                    x_root_window_,
  97                    RRScreenChangeNotifyMask |
  98                    RROutputChangeNotifyMask |
  99                    RRCrtcChangeNotifyMask);
 100
 101     displays_ = BuildDisplaysFromXRandRInfo();
 102   } else {
 103     displays_ = GetFallbackDisplayList();
 104   }
 105 }
 106
 107 DesktopScreenX11::~DesktopScreenX11() {
 108   if (has_xrandr_ && ui::PlatformEventSource::GetInstance())
 109     ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
 110 }
 111
 112 ////////////////////////////////////////////////////////////////////////////////
 113 // DesktopScreenX11, gfx::Screen implementation:
 114
 115 bool DesktopScreenX11::IsDIPEnabled() {
 116   return true;
 117 }
 118
 119 gfx::Point DesktopScreenX11::GetCursorScreenPoint() {
 120   TRACE_EVENT0("views", "DesktopScreenX11::GetCursorScreenPoint()");
 121
 122   XDisplay* display = gfx::GetXDisplay();
 123
 124   ::Window root, child;
 125   int root_x, root_y, win_x, win_y;
 126   unsigned int mask;
 127   XQueryPointer(display,
 128                 DefaultRootWindow(display),
 129                 &root,
 130                 &child,
 131                 &root_x,
 132                 &root_y,
 133                 &win_x,
 134                 &win_y,
 135                 &mask);
 136
 137   return gfx::Point(root_x, root_y);
 138 }
 139
 140 gfx::NativeWindow DesktopScreenX11::GetWindowUnderCursor() {
 141   return GetWindowAtScreenPoint(GetCursorScreenPoint());
 142 }
 143
 144 gfx::NativeWindow DesktopScreenX11::GetWindowAtScreenPoint(
 145     const gfx::Point& point) {
 146   X11TopmostWindowFinder finder;
 147   return finder.FindLocalProcessWindowAt(point, std::set<aura::Window*>());
 148 }
 149
 150 int DesktopScreenX11::GetNumDisplays() const {
 151   return displays_.size();
 152 }
 153
 154 std::vector<gfx::Display> DesktopScreenX11::GetAllDisplays() const {
 155   return displays_;
 156 }
 157
 158 gfx::Display DesktopScreenX11::GetDisplayNearestWindow(
 159     gfx::NativeView window) const {
 160   // Getting screen bounds here safely is hard.
 161   //
 162   // You'd think we'd be able to just call window->GetBoundsInScreen(), but we
 163   // can't because |window| (and the associated WindowEventDispatcher*) can be
 164   // partially initialized at this point; WindowEventDispatcher initializations
 165   // call through into GetDisplayNearestWindow(). But the X11 resources are
 166   // created before we create the aura::WindowEventDispatcher. So we ask what
 167   // the DRWHX11 believes the window bounds are instead of going through the
 168   // aura::Window's screen bounds.
 169   aura::WindowTreeHost* host = window->GetHost();
 170   if (host) {
 171     DesktopWindowTreeHostX11* rwh = DesktopWindowTreeHostX11::GetHostForXID(
 172         host->GetAcceleratedWidget());
 173     if (rwh)
 174       return GetDisplayMatching(rwh->GetX11RootWindowBounds());
 175   }
 176
 177   return GetPrimaryDisplay();
 178 }
 179
 180 gfx::Display DesktopScreenX11::GetDisplayNearestPoint(
 181     const gfx::Point& point) const {
 182   for (std::vector<gfx::Display>::const_iterator it = displays_.begin();
 183        it != displays_.end(); ++it) {
 184     if (it->bounds().Contains(point))
 185       return *it;
 186   }
 187
 188   return GetPrimaryDisplay();
 189 }
 190
 191 gfx::Display DesktopScreenX11::GetDisplayMatching(
 192     const gfx::Rect& match_rect) const {
 193   int max_area = 0;
 194   const gfx::Display* matching = NULL;
 195   for (std::vector<gfx::Display>::const_iterator it = displays_.begin();
 196        it != displays_.end(); ++it) {
 197     gfx::Rect intersect = gfx::IntersectRects(it->bounds(), match_rect);
 198     int area = intersect.width() * intersect.height();
 199     if (area > max_area) {
 200       max_area = area;
 201       matching = &*it;
 202     }
 203   }
 204   // Fallback to the primary display if there is no matching display.
 205   return matching ? *matching : GetPrimaryDisplay();
 206 }
 207
 208 gfx::Display DesktopScreenX11::GetPrimaryDisplay() const {
 209   return displays_.front();
 210 }
 211
 212 void DesktopScreenX11::AddObserver(gfx::DisplayObserver* observer) {
 213   change_notifier_.AddObserver(observer);
 214 }
 215
 216 void DesktopScreenX11::RemoveObserver(gfx::DisplayObserver* observer) {
 217   change_notifier_.RemoveObserver(observer);
 218 }
 219
 220 bool DesktopScreenX11::CanDispatchEvent(const ui::PlatformEvent& event) {
 221   return event->type - xrandr_event_base_ == RRScreenChangeNotify ||
 222          event->type - xrandr_event_base_ == RRNotify;
 223 }
 224
 225 uint32_t DesktopScreenX11::DispatchEvent(const ui::PlatformEvent& event) {
 226   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
 227     // Pass the event through to xlib.
 228     XRRUpdateConfiguration(event);
 229   } else if (event->type - xrandr_event_base_ == RRNotify) {
 230     // There's some sort of observer dispatch going on here, but I don't think
 231     // it's the screen's?
 232     if (configure_timer_.get() && configure_timer_->IsRunning()) {
 233       configure_timer_->Reset();
 234     } else {
 235       configure_timer_.reset(new base::OneShotTimer<DesktopScreenX11>());
 236       configure_timer_->Start(
 237           FROM_HERE,
 238           base::TimeDelta::FromMilliseconds(kConfigureDelayMs),
 239           this,
 240           &DesktopScreenX11::ConfigureTimerFired);
 241     }
 242   } else {
 243     NOTREACHED();
 244   }
 245
 246   return ui::POST_DISPATCH_NONE;
 247 }
 248
 249 ////////////////////////////////////////////////////////////////////////////////
 250 // DesktopScreenX11, private:
 251
 252 DesktopScreenX11::DesktopScreenX11(
 253     const std::vector<gfx::Display>& test_displays)
 254     : xdisplay_(gfx::GetXDisplay()),
 255       x_root_window_(DefaultRootWindow(xdisplay_)),
 256       has_xrandr_(false),
 257       xrandr_event_base_(0),
 258       displays_(test_displays) {
 259 }
 260
 261 std::vector<gfx::Display> DesktopScreenX11::BuildDisplaysFromXRandRInfo() {
 262   std::vector<gfx::Display> displays;
 263   XRRScreenResources* resources =
 264       XRRGetScreenResourcesCurrent(xdisplay_, x_root_window_);
 265   if (!resources) {
 266     LOG(ERROR) << "XRandR returned no displays. Falling back to Root Window.";
 267     return GetFallbackDisplayList();
 268   }
 269
 270   bool has_work_area = false;
 271   gfx::Rect work_area;
 272   std::vector<int> value;
 273   if (ui::GetIntArrayProperty(x_root_window_, "_NET_WORKAREA", &value) &&
 274       value.size() >= 4) {
 275     work_area = gfx::Rect(value[0], value[1], value[2], value[3]);
 276     has_work_area = true;
 277   }
 278
 279   float device_scale_factor = 1.0f;
 280   for (int i = 0; i < resources->noutput; ++i) {
 281     RROutput output_id = resources->outputs[i];
 282     XRROutputInfo* output_info =
 283         XRRGetOutputInfo(xdisplay_, resources, output_id);
 284
 285     bool is_connected = (output_info->connection == RR_Connected);
 286     if (!is_connected) {
 287       XRRFreeOutputInfo(output_info);
 288       continue;
 289     }
 290
 291     if (output_info->crtc) {
 292       XRRCrtcInfo *crtc = XRRGetCrtcInfo(xdisplay_,
 293                                          resources,
 294                                          output_info->crtc);
 295
 296       int64 display_id = -1;
 297       if (!ui::GetDisplayId(output_id, static_cast<uint8>(i), &display_id)) {
 298         // It isn't ideal, but if we can't parse the EDID data, fallback on the
 299         // display number.
 300         display_id = i;
 301       }
 302
 303       gfx::Rect crtc_bounds(crtc->x, crtc->y, crtc->width, crtc->height);
 304       gfx::Display display(display_id, crtc_bounds);
 305
 306       if (!gfx::Display::HasForceDeviceScaleFactor()) {
 307         if (i == 0 && !ui::IsDisplaySizeBlackListed(
 308             gfx::Size(output_info->mm_width, output_info->mm_height))) {
 309           // As per display scale factor is not supported right now,
 310           // the primary display's scale factor is always used.
 311           device_scale_factor = GetDeviceScaleFactor(crtc->width,
 312                                                      output_info->mm_width);
 313           DCHECK_LE(1.0f, device_scale_factor);
 314         }
 315         display.SetScaleAndBounds(device_scale_factor, crtc_bounds);
 316       }
 317
 318       if (has_work_area) {
 319         gfx::Rect intersection = crtc_bounds;
 320         intersection.Intersect(work_area);
 321         display.set_work_area(intersection);
 322       }
 323
 324       switch (crtc->rotation) {
 325         case RR_Rotate_0:
 326           display.set_rotation(gfx::Display::ROTATE_0);
 327           break;
 328         case RR_Rotate_90:
 329           display.set_rotation(gfx::Display::ROTATE_90);
 330           break;
 331         case RR_Rotate_180:
 332           display.set_rotation(gfx::Display::ROTATE_180);
 333           break;
 334         case RR_Rotate_270:
 335           display.set_rotation(gfx::Display::ROTATE_270);
 336           break;
 337       }
 338
 339       displays.push_back(display);
 340
 341       XRRFreeCrtcInfo(crtc);
 342     }
 343
 344     XRRFreeOutputInfo(output_info);
 345   }
 346
 347   XRRFreeScreenResources(resources);
 348
 349   if (displays.empty())
 350     return GetFallbackDisplayList();
 351
 352   return displays;
 353 }
 354
 355 void DesktopScreenX11::ConfigureTimerFired() {
 356   std::vector<gfx::Display> old_displays = displays_;
 357   displays_ = BuildDisplaysFromXRandRInfo();
 358
 359   change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
 360 }
 361
 362 ////////////////////////////////////////////////////////////////////////////////
 363
 364 gfx::Screen* CreateDesktopScreen() {
 365   return new DesktopScreenX11;
 366 }
 367
 368 }  // namespace views