ash: Get output info from chromeos instead of XRandR.

ash/display/display_change_observer_x11.cc

-// 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 "ash/display/display_change_observer_x11.h"
-
-#include <algorithm>
-#include <map>
-#include <set>
-#include <vector>
-
-#include <X11/extensions/Xrandr.h>
-
-#include "ash/ash_switches.h"
-#include "ash/display/display_info.h"
-#include "ash/display/display_layout_store.h"
-#include "ash/display/display_manager.h"
-#include "ash/display/display_util_x11.h"
-#include "ash/shell.h"
-#include "base/command_line.h"
-#include "base/message_loop/message_pump_aurax11.h"
-#include "chromeos/display/output_util.h"
-#include "grit/ash_strings.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/compositor/dip_util.h"
-#include "ui/gfx/display.h"
-
-namespace ash {
-namespace internal {
-
-using chromeos::OutputConfigurator;
-
-namespace {
-
-// The DPI threshold to detect high density screen.
-// Higher DPI than this will use device_scale_factor=2.
-const unsigned int kHighDensityDPIThreshold = 160;
-
-// 1 inch in mm.
-const float kInchInMm = 25.4f;
-
-int64 GetDisplayId(XID output, size_t output_index) {
-  int64 display_id;
-  if (chromeos::GetDisplayId(output, output_index, &display_id))
-    return display_id;
-  return gfx::Display::kInvalidDisplayID;
-}
-
-}  // namespace
-
-DisplayChangeObserverX11::DisplayChangeObserverX11()
-    : 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);
-
-  Shell::GetInstance()->AddShellObserver(this);
-}
-
-DisplayChangeObserverX11::~DisplayChangeObserverX11() {
-  Shell::GetInstance()->RemoveShellObserver(this);
-}
-
-chromeos::OutputState DisplayChangeObserverX11::GetStateForDisplayIds(
-    const std::vector<int64>& display_ids) const {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kAshForceMirrorMode)) {
-    return chromeos::STATE_DUAL_MIRROR;
-  }
-
-  CHECK_EQ(2U, display_ids.size());
-  DisplayIdPair pair = std::make_pair(display_ids[0], display_ids[1]);
-  DisplayLayout layout = Shell::GetInstance()->display_manager()->
-      layout_store()->GetRegisteredDisplayLayout(pair);
-  return layout.mirrored ?
-      chromeos::STATE_DUAL_MIRROR : chromeos::STATE_DUAL_EXTENDED;
-}
-
-bool DisplayChangeObserverX11::GetResolutionForDisplayId(int64 display_id,
-                                                         int* width,
-                                                         int* height) const {
-
-  gfx::Size resolution;
-  if (!Shell::GetInstance()->display_manager()->
-      GetSelectedResolutionForDisplayId(display_id, &resolution)) {
-    return false;
-  }
-
-  *width = resolution.width();
-  *height = resolution.height();
-  return true;
-}
-
-void DisplayChangeObserverX11::OnDisplayModeChanged(
-    const std::vector<OutputConfigurator::OutputSnapshot>& outputs) {
-  // TODO(derat): Use |outputs| instead of re-fetching information.
-  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<DisplayInfo> displays;
-  std::set<int64> ids;
-  for (int output_index = 0; output_index < screen_resources->noutput;
-       output_index++) {
-    XID output = screen_resources->outputs[output_index];
-    XRROutputInfo *output_info =
-        XRRGetOutputInfo(xdisplay_, screen_resources, output);
-
-    const bool is_internal = chromeos::IsInternalOutputName(
-        std::string(output_info->name));
-
-    if (is_internal &&
-        gfx::Display::InternalDisplayId() == gfx::Display::kInvalidDisplayID) {
-      int64 id = GetDisplayId(output, output_index);
-      // Fallback to output index. crbug.com/180100
-      gfx::Display::SetInternalDisplayId(
-          id == gfx::Display::kInvalidDisplayID ? output_index : id);
-    }
-
-    if (output_info->connection != RR_Connected) {
-      XRRFreeOutputInfo(output_info);
-      continue;
-    }
-    const XRRCrtcInfo* crtc_info = crtc_info_map[output_info->crtc];
-    if (!crtc_info) {
-      LOG(WARNING) << "Crtc not found for output: output_index="
-                   << output_index;
-      continue;
-    }
-    const XRRModeInfo* mode =
-        chromeos::FindXRRModeInfo(screen_resources, crtc_info->mode);
-    if (!mode) {
-      LOG(WARNING) << "Could not find a mode for the output: output_index="
-                   << output_index;
-      continue;
-    }
-
-    float device_scale_factor = 1.0f;
-    if (!ShouldIgnoreSize(output_info->mm_width, output_info->mm_height) &&
-        (kInchInMm * mode->width / output_info->mm_width) >
-        kHighDensityDPIThreshold) {
-      device_scale_factor = 2.0f;
-    }
-    gfx::Rect display_bounds(
-        crtc_info->x, crtc_info->y, mode->width, mode->height);
-
-    std::vector<Resolution> resolutions;
-    if (!is_internal)
-      resolutions = GetResolutionList(screen_resources, output_info);
-
-    XRRFreeOutputInfo(output_info);
-
-    std::string name = is_internal ?
-        l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME) :
-        chromeos::GetDisplayName(output);
-    if (name.empty())
-      name = l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
-
-    bool has_overscan = false;
-    chromeos::GetOutputOverscanFlag(output, &has_overscan);
-
-    int64 id = GetDisplayId(output, output_index);
-
-    // If ID is invalid or there is an duplicate, just use output index.
-    if (id == gfx::Display::kInvalidDisplayID || ids.find(id) != ids.end())
-      id = output_index;
-    ids.insert(id);
-
-    displays.push_back(DisplayInfo(id, name, has_overscan));
-    displays.back().set_device_scale_factor(device_scale_factor);
-    displays.back().SetBounds(display_bounds);
-    displays.back().set_native(true);
-    displays.back().set_resolutions(resolutions);
-  }
-
-  // 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);
-
-  // DisplayManager can be null during the boot.
-  Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
-}
-
-void DisplayChangeObserverX11::OnAppTerminating() {
-#if defined(USE_ASH)
-  // Stop handling display configuration events once the shutdown
-  // process starts. crbug.com/177014.
-  Shell::GetInstance()->output_configurator()->Stop();
-#endif
-}
-
-}  // namespace internal
-}  // namespace ash