chrome/browser/extensions/display_info_provider_win.cc

   1 // Copyright 2014 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 "chrome/browser/extensions/display_info_provider_win.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/hash.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/win/win_util.h"
  13 #include "extensions/common/api/system_display.h"
  14 #include "ui/gfx/geometry/size.h"
  15 #include "ui/gfx/screen.h"
  16 #include "ui/gfx/win/dpi.h"
  17
  18 namespace extensions {
  19
  20 using api::system_display::DisplayUnitInfo;
  21
  22 namespace {
  23
  24 BOOL CALLBACK
  25 EnumMonitorCallback(HMONITOR monitor, HDC hdc, LPRECT rect, LPARAM data) {
  26   DisplayInfo* all_displays = reinterpret_cast<DisplayInfo*>(data);
  27   DCHECK(all_displays);
  28
  29   linked_ptr<DisplayUnitInfo> unit(new DisplayUnitInfo);
  30
  31   MONITORINFOEX monitor_info;
  32   ZeroMemory(&monitor_info, sizeof(MONITORINFOEX));
  33   monitor_info.cbSize = sizeof(monitor_info);
  34   GetMonitorInfo(monitor, &monitor_info);
  35
  36   DISPLAY_DEVICE device;
  37   device.cb = sizeof(device);
  38   if (!EnumDisplayDevices(monitor_info.szDevice, 0, &device, 0))
  39     return FALSE;
  40
  41   gfx::Size dpi(gfx::GetDPI());
  42   unit->id =
  43       base::Int64ToString(base::Hash(base::WideToUTF8(monitor_info.szDevice)));
  44   unit->name = base::WideToUTF8(device.DeviceString);
  45   unit->dpi_x = dpi.width();
  46   unit->dpi_y = dpi.height();
  47   all_displays->push_back(unit);
  48
  49   return TRUE;
  50 }
  51
  52 }  // namespace
  53
  54 DisplayInfoProviderWin::DisplayInfoProviderWin() {
  55 }
  56
  57 DisplayInfoProviderWin::~DisplayInfoProviderWin() {
  58 }
  59
  60 bool DisplayInfoProviderWin::SetInfo(
  61     const std::string& display_id,
  62     const api::system_display::DisplayProperties& info,
  63     std::string* error) {
  64   *error = "Not implemented";
  65   return false;
  66 }
  67
  68 void DisplayInfoProviderWin::UpdateDisplayUnitInfoForPlatform(
  69     const gfx::Display& display,
  70     extensions::api::system_display::DisplayUnitInfo* unit) {
  71   DisplayInfo all_displays;
  72   EnumDisplayMonitors(
  73       NULL, NULL, EnumMonitorCallback, reinterpret_cast<LPARAM>(&all_displays));
  74   for (size_t i = 0; i < all_displays.size(); ++i) {
  75     if (unit->id == all_displays[i]->id) {
  76       unit->name = all_displays[i]->name;
  77       unit->dpi_x = all_displays[i]->dpi_x;
  78       unit->dpi_y = all_displays[i]->dpi_y;
  79       break;
  80     }
  81   }
  82 }
  83
  84 gfx::Screen* DisplayInfoProviderWin::GetActiveScreen() {
  85   // TODO(scottmg): native screen is wrong http://crbug.com/133312
  86   return gfx::Screen::GetNativeScreen();
  87 }
  88
  89 // static
  90 DisplayInfoProvider* DisplayInfoProvider::Create() {
  91   return new DisplayInfoProviderWin();
  92 }
  93
  94 }  // namespace extensions