ash/display/display_change_observer_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 "ash/display/display_change_observer_x11.h"
   6
   7 #include <algorithm>
   8 #include <map>
   9 #include <set>
  10 #include <vector>
  11
  12 #include <X11/extensions/Xrandr.h>
  13
  14 #include "ash/display/display_manager.h"
  15 #include "ash/shell.h"
  16 #include "base/message_pump_aurax11.h"
  17 #include "ui/base/x/x11_util.h"
  18 #include "ui/compositor/dip_util.h"
  19 #include "ui/gfx/display.h"
  20
  21 namespace ash {
  22 namespace internal {
  23
  24 namespace {
  25
  26 // The DPI threshold to detect high density screen.
  27 // Higher DPI than this will use device_scale_factor=2.
  28 // Note: This value has to be kept in sync with the mouse/touchpad driver
  29 // which controls mouse pointer acceleration. If you need to update this value,
  30 // please update the bug (crosbug.com/31628) first and make sure that the
  31 // driver will use the same value.
  32 // This value also has to be kept in sync with the value in
  33 // chromeos/display/output_configurator.cc. See crbug.com/130188
  34 const unsigned int kHighDensityDIPThreshold = 160;
  35
  36 // 1 inch in mm.
  37 const float kInchInMm = 25.4f;
  38
  39 XRRModeInfo* FindMode(XRRScreenResources* screen_resources, XID current_mode) {
  40   for (int m = 0; m < screen_resources->nmode; m++) {
  41     XRRModeInfo *mode = &screen_resources->modes[m];
  42     if (mode->id == current_mode)
  43       return mode;
  44   }
  45   return NULL;
  46 }
  47
  48 bool CompareDisplayY(const gfx::Display& lhs, const gfx::Display& rhs) {
  49   return lhs.bounds_in_pixel().y() < rhs.bounds_in_pixel().y();
  50 }
  51
  52 // A list of bogus sizes in mm that X detects and should be ignored.
  53 // See crbug.com/136533.
  54 const unsigned long kInvalidDisplaySizeList[][2] = {
  55   {160, 100},
  56   {160, 90},
  57   {50, 40},
  58   {40, 30},
  59 };
  60
  61 // Returns true if the size nifo in the output_info isn't valid
  62 // and should be ignored.
  63 bool ShouldIgnoreSize(XRROutputInfo *output_info) {
  64   if (output_info->mm_width == 0 || output_info->mm_height == 0) {
  65     LOG(WARNING) << "No display size available";
  66     return true;
  67   }
  68   for (unsigned long i = 0 ; i < arraysize(kInvalidDisplaySizeList); ++i) {
  69     const unsigned long* size = kInvalidDisplaySizeList[i];
  70     if (output_info->mm_width == size[0] && output_info->mm_height == size[1]) {
  71       LOG(WARNING) << "Black listed display size detected:"
  72                    << size[0] << "x" << size[1];
  73       return true;
  74     }
  75   }
  76   return false;
  77 }
  78
  79 }  // namespace
  80
  81 DisplayChangeObserverX11::DisplayChangeObserverX11()
  82     : xdisplay_(base::MessagePumpAuraX11::GetDefaultXDisplay()),
  83       x_root_window_(DefaultRootWindow(xdisplay_)),
  84       xrandr_event_base_(0) {
  85   int error_base_ignored;
  86   XRRQueryExtension(xdisplay_, &xrandr_event_base_, &error_base_ignored);
  87   base::MessagePumpAuraX11::Current()->AddDispatcherForRootWindow(this);
  88 }
  89
  90 DisplayChangeObserverX11::~DisplayChangeObserverX11() {
  91   base::MessagePumpAuraX11::Current()->RemoveDispatcherForRootWindow(this);
  92 }
  93
  94 bool DisplayChangeObserverX11::Dispatch(const base::NativeEvent& event) {
  95   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
  96     NotifyDisplayChange();
  97   }
  98   return true;
  99 }
 100
 101 void DisplayChangeObserverX11::NotifyDisplayChange() {
 102   XRRScreenResources* screen_resources =
 103       XRRGetScreenResources(xdisplay_, x_root_window_);
 104   std::map<XID, XRRCrtcInfo*> crtc_info_map;
 105
 106   for (int c = 0; c < screen_resources->ncrtc; c++) {
 107     XID crtc_id = screen_resources->crtcs[c];
 108     XRRCrtcInfo *crtc_info =
 109         XRRGetCrtcInfo(xdisplay_, screen_resources, crtc_id);
 110     crtc_info_map[crtc_id] = crtc_info;
 111   }
 112
 113   std::vector<gfx::Display> displays;
 114   std::set<int> y_coords;
 115   std::set<int64> ids;
 116   for (int o = 0; o < screen_resources->noutput; o++) {
 117     XRROutputInfo *output_info =
 118         XRRGetOutputInfo(xdisplay_,
 119                          screen_resources,
 120                          screen_resources->outputs[o]);
 121     if (output_info->connection != RR_Connected) {
 122       XRRFreeOutputInfo(output_info);
 123       continue;
 124     }
 125     XRRCrtcInfo* crtc_info = crtc_info_map[output_info->crtc];
 126     if (!crtc_info) {
 127       LOG(WARNING) << "Crtc not found for output: output=" << o;
 128       continue;
 129     }
 130     XRRModeInfo* mode = FindMode(screen_resources, crtc_info->mode);
 131     if (!mode) {
 132       LOG(WARNING) << "Could not find a mode for the output: output=" << o;
 133       continue;
 134     }
 135     // Mirrored monitors have the same y coordinates.
 136     if (y_coords.find(crtc_info->y) != y_coords.end())
 137       continue;
 138     displays.push_back(gfx::Display());
 139
 140     float device_scale_factor = 1.0f;
 141     if (!ShouldIgnoreSize(output_info) &&
 142         (kInchInMm * mode->width / output_info->mm_width) >
 143         kHighDensityDIPThreshold) {
 144       device_scale_factor = 2.0f;
 145     }
 146     displays.back().SetScaleAndBounds(
 147         device_scale_factor,
 148         gfx::Rect(crtc_info->x, crtc_info->y, mode->width, mode->height));
 149
 150     uint16 manufacturer_id = 0;
 151     uint32 serial_number = 0;
 152     if (ui::GetOutputDeviceData(screen_resources->outputs[o], &manufacturer_id,
 153                                 &serial_number, NULL) && manufacturer_id != 0) {
 154       // An ID based on display's index will be assigned later if this call
 155       // fails.
 156       int64 new_id = gfx::Display::GetID(manufacturer_id, serial_number);
 157       if (ids.find(new_id) == ids.end()) {
 158         displays.back().set_id(new_id);
 159         ids.insert(new_id);
 160       }
 161     }
 162
 163     y_coords.insert(crtc_info->y);
 164     XRRFreeOutputInfo(output_info);
 165   }
 166
 167   // Free all allocated resources.
 168   for (std::map<XID, XRRCrtcInfo*>::const_iterator iter = crtc_info_map.begin();
 169        iter != crtc_info_map.end(); ++iter) {
 170     XRRFreeCrtcInfo(iter->second);
 171   }
 172   XRRFreeScreenResources(screen_resources);
 173
 174   // PowerManager lays out the outputs vertically. Sort them by Y
 175   // coordinates.
 176   std::sort(displays.begin(), displays.end(), CompareDisplayY);
 177   int64 id = 0;
 178   for (std::vector<gfx::Display>::iterator iter = displays.begin();
 179        iter != displays.end(); ++iter) {
 180     if (iter->id() == gfx::Display::kInvalidDisplayID) {
 181       iter->set_id(id);
 182       ++id;
 183     }
 184   }
 185   // DisplayManager can be null during the boot.
 186   Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
 187 }
 188
 189 }  // namespace internal
 190 }  // namespace ash