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      1 // Copyright (c) 2011 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/fullscreen.h"
      6 
      7 #include <windows.h>
      8 #include <shellapi.h>
      9 
     10 #include "base/logging.h"
     11 #include "base/sys_info.h"
     12 
     13 static bool IsPlatformFullScreenMode() {
     14   // SHQueryUserNotificationState is only available for Vista and above.
     15 #if defined(NTDDI_VERSION) && (NTDDI_VERSION >= NTDDI_VISTA)
     16   int32 major_version, minor_version, fix_version;
     17   base::SysInfo::OperatingSystemVersionNumbers(&major_version,
     18                                                &minor_version,
     19                                                &fix_version);
     20   if (major_version < 6)
     21     return false;
     22 
     23   typedef HRESULT(WINAPI *SHQueryUserNotificationStatePtr)(
     24       QUERY_USER_NOTIFICATION_STATE* state);
     25 
     26   HMODULE shell32_base = ::GetModuleHandle(L"shell32.dll");
     27   if (!shell32_base) {
     28     NOTREACHED();
     29     return false;
     30   }
     31   SHQueryUserNotificationStatePtr query_user_notification_state_ptr =
     32         reinterpret_cast<SHQueryUserNotificationStatePtr>
     33             (::GetProcAddress(shell32_base, "SHQueryUserNotificationState"));
     34   if (!query_user_notification_state_ptr) {
     35     NOTREACHED();
     36     return false;
     37   }
     38 
     39   QUERY_USER_NOTIFICATION_STATE state;
     40   if (FAILED((*query_user_notification_state_ptr)(&state)))
     41     return false;
     42   return state == QUNS_RUNNING_D3D_FULL_SCREEN ||
     43          state == QUNS_PRESENTATION_MODE;
     44 #else
     45   return false;
     46 #endif
     47 }
     48 
     49 static bool IsFullScreenWindowMode() {
     50   // Get the foreground window which the user is currently working on.
     51   HWND wnd = ::GetForegroundWindow();
     52   if (!wnd)
     53     return false;
     54 
     55   // Get the monitor where the window is located.
     56   RECT wnd_rect;
     57   if (!::GetWindowRect(wnd, &wnd_rect))
     58     return false;
     59   HMONITOR monitor = ::MonitorFromRect(&wnd_rect, MONITOR_DEFAULTTONULL);
     60   if (!monitor)
     61     return false;
     62   MONITORINFO monitor_info = { sizeof(monitor_info) };
     63   if (!::GetMonitorInfo(monitor, &monitor_info))
     64     return false;
     65 
     66   // It should be the main monitor.
     67   if (!(monitor_info.dwFlags & MONITORINFOF_PRIMARY))
     68     return false;
     69 
     70   // The window should be at least as large as the monitor.
     71   if (!::IntersectRect(&wnd_rect, &wnd_rect, &monitor_info.rcMonitor))
     72     return false;
     73   if (!::EqualRect(&wnd_rect, &monitor_info.rcMonitor))
     74     return false;
     75 
     76   // At last, the window style should not have WS_DLGFRAME and WS_THICKFRAME and
     77   // its extended style should not have WS_EX_WINDOWEDGE and WS_EX_TOOLWINDOW.
     78   LONG style = ::GetWindowLong(wnd, GWL_STYLE);
     79   LONG ext_style = ::GetWindowLong(wnd, GWL_EXSTYLE);
     80   return !((style & (WS_DLGFRAME | WS_THICKFRAME)) ||
     81            (ext_style & (WS_EX_WINDOWEDGE | WS_EX_TOOLWINDOW)));
     82 }
     83 
     84 static bool IsFullScreenConsoleMode() {
     85   // We detect this by attaching the current process to the console of the
     86   // foreground window and then checking if it is in full screen mode.
     87   DWORD pid = 0;
     88   ::GetWindowThreadProcessId(::GetForegroundWindow(), &pid);
     89   if (!pid)
     90     return false;
     91 
     92   if (!::AttachConsole(pid))
     93     return false;
     94 
     95   DWORD modes = 0;
     96   ::GetConsoleDisplayMode(&modes);
     97   ::FreeConsole();
     98 
     99   return (modes & (CONSOLE_FULLSCREEN | CONSOLE_FULLSCREEN_HARDWARE)) != 0;
    100 }
    101 
    102 bool IsFullScreenMode() {
    103   return IsPlatformFullScreenMode() ||
    104          IsFullScreenWindowMode() ||
    105          IsFullScreenConsoleMode();
    106 }
    107