Multi-monitor extension API.

chrome/browser/extensions/api/system_info_display/display_info_provider_chromeos.cc

+// Copyright (c) 2013 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 "chrome/browser/extensions/api/system_info_display/display_info_provider.h"
+
+#include "ash/display/display_manager.h"
+#include "ash/shell.h"
+#include "base/string_number_conversions.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/rect.h"
+
+using ash::internal::DisplayManager;
+
+namespace extensions {
+
+namespace {
+
+// TODO(hshi): determine the DPI of the screen.
+const float kDpi96 = 96.0;
+
+}  // namespace
+
+using api::system_info_display::Bounds;
+using api::system_info_display::DisplayUnitInfo;
+
+bool DisplayInfoProvider::QueryInfo(DisplayInfo* info) {
+  DCHECK(info);
+  info->clear();
+
+  DisplayManager* display_manager =
+      ash::Shell::GetInstance()->display_manager();
+  DCHECK(display_manager);
+
+  int64 primary_id = ash::Shell::GetScreen()->GetPrimaryDisplay().id();
+  for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
+    linked_ptr<DisplayUnitInfo> unit(new DisplayUnitInfo());
+    const gfx::Display* display = display_manager->GetDisplayAt(i);
+    const gfx::Rect& bounds = display->bounds();
+    const gfx::Rect& work_area = display->work_area();
+    unit->id = base::Int64ToString(display->id());
+    unit->name = display_manager->GetDisplayNameFor(*display);
+    unit->is_primary = (display->id() == primary_id);
+    unit->is_internal = display_manager->IsInternalDisplayId(display->id());
+    unit->is_enabled = true;
+    unit->dpi_x = kDpi96;
+    unit->dpi_y = kDpi96;

[oshima, 2013/01/25 23:21:53]

sorry i didn't catch it first time. You probably should multiply this with
Display::device_scale_factor()

[hshi1, 2013/01/25 23:46:07]

Done.

+    unit->bounds.left = bounds.x();
+    unit->bounds.top = bounds.y();
+    unit->bounds.width = bounds.width();
+    unit->bounds.height = bounds.height();
+    unit->work_area.left = work_area.x();
+    unit->work_area.top = work_area.y();
+    unit->work_area.width = work_area.width();
+    unit->work_area.height = work_area.height();
+    info->push_back(unit);
+  }
+
+  return true;
+}
+
+}  // namespace extensions