display.cpp

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/* static */
int wxDisplayBase::GetFromWindow(wxWindow *window)
{
    return DisplayFromHMONITOR
           (
            ::MonitorFromWindow(GetHwndOf(window), MONITOR_DEFAULTTONULL)
           );
}

// ----------------------------------------------------------------------------
// wxDisplay ctor/dtor
// ----------------------------------------------------------------------------

wxDisplay::wxDisplay ( size_t n )
         : wxDisplayBase ( n )
{
    // if we do this in ctor we won't have to call it from all the member
    // functions
    InitDisplays();

    if ( gs_useDirectX )
    {
        wxDisplayInfo& dpyInfo = (*gs_displays)[n];

        LPDIRECTDRAW2& pDD2 = dpyInfo.m_pDD2;
        if ( !pDD2 )
        {
            if ( !gs_DirectDrawCreate )
            {
                // what to do??
                return;
            }

            IDirectDraw *pDD;
            HRESULT hr = (*gs_DirectDrawCreate)(&dpyInfo.m_guid, &pDD, NULL);

            if ( FAILED(hr) || !pDD )
            {
                // what to do??
                wxLogApiError(_T("DirectDrawCreate"), hr);
            }
            else // got IDirectDraw, we want IDirectDraw2
            {
                hr = pDD->QueryInterface(wxIID_IDirectDraw2, (void **)&pDD2);
                if ( FAILED(hr) || !pDD2 )
                {
                    wxLogApiError(_T("IDirectDraw::QueryInterface(IDD2)"), hr);
                }

                pDD->Release();
            }
        }
        //else: DirectDraw object corresponding to our display already exists

        // increment its ref count to account for Release() in dtor
        //
        // NB: pDD2 will be only really Release()d when gs_displays is
        //     destroyed which is ok as we don't want to recreate DD objects
        //     all the time
        pDD2->AddRef();
    }
}

wxDisplay::~wxDisplay()
{
    wxDisplayInfo& dpyInfo = (*gs_displays)[m_index];

    LPDIRECTDRAW2& pDD2 = dpyInfo.m_pDD2;
    if ( pDD2 )
    {
        pDD2->Release();
    }
}

// ----------------------------------------------------------------------------
// wxDisplay simple accessors
// ----------------------------------------------------------------------------

bool wxDisplay::IsOk() const
{
    return m_index < GetCount() &&
                (!gs_useDirectX || (*gs_displays)[m_index].m_pDD2);
}

wxRect wxDisplay::GetGeometry() const
{
    wxDisplayInfo& dpyInfo = (*gs_displays)[m_index];
    wxRect& rect = dpyInfo.m_rect;
    if ( !rect.width )
    {
        MONITORINFO monInfo;
        wxZeroMemory(monInfo);
        monInfo.cbSize = sizeof(monInfo);

        if ( !::GetMonitorInfo(dpyInfo.m_hmon, &monInfo) )
        {
            wxLogLastError(_T("GetMonitorInfo"));
        }
        else
        {
            wxCopyRECTToRect(monInfo.rcMonitor, rect);
        }
    }

    return rect;
}

wxString wxDisplay::GetName() const
{
    wxDisplayInfo& dpyInfo = (*gs_displays)[m_index];
    if ( dpyInfo.m_devName.empty() )
    {
        MONITORINFOEX monInfo;
        wxZeroMemory(monInfo);
        monInfo.cbSize = sizeof(monInfo);

        // NB: Cast from MONITORINFOEX* to MONITORINFO* is done because
        //     Mingw headers - unlike the ones from Microsoft's Platform SDK -
        //     don't derive the former from the latter in C++ mode and so
        //     the pointer's type is not converted implicitly.
        if ( !::GetMonitorInfo(dpyInfo.m_hmon, (LPMONITORINFO)&monInfo) )
        {
            wxLogLastError(_T("GetMonitorInfo"));
        }
        else
        {
            dpyInfo.m_devName = monInfo.szDevice;
        }
    }

    return dpyInfo.m_devName;
}

wxString wxDisplay::GetNameForEnumSettings() const
{
    int major, minor;
    const bool isWin95 = wxGetOsVersion(&major, &minor) == wxWIN95 &&
                            major == 4 && minor == 0;

    // the first parameter of EnumDisplaySettings() must be NULL under Win95
    // according to MSDN but GetMonitorInfo() stub in multimon.h still returns
    // something even in this case, so we have to correct this manually
    wxString name;
    if ( !isWin95 )
        name = GetName();

    return name;
}

// ----------------------------------------------------------------------------
// determine if this is the primary display
// ----------------------------------------------------------------------------

bool wxDisplay::IsPrimary() const
{
    wxDisplayInfo& dpyInfo = (*gs_displays)[m_index];

    MONITORINFOEX monInfo;
    wxZeroMemory(monInfo);
    monInfo.cbSize = sizeof(monInfo);

    // NB: Cast from MONITORINFOEX* to MONITORINFO* is done because
    //     Mingw headers - unlike the ones from Microsoft's Platform SDK -
    //     don't derive the former from the latter in C++ mode and so
    //     the pointer's type is not converted implicitly.
    if ( !::GetMonitorInfo(dpyInfo.m_hmon, (LPMONITORINFO)&monInfo) )
    {
        wxLogLastError(_T("GetMonitorInfo"));
    }

    return (monInfo.dwFlags & MONITORINFOF_PRIMARY) == MONITORINFOF_PRIMARY;
}

// ----------------------------------------------------------------------------
// video modes enumeration
// ----------------------------------------------------------------------------

wxArrayVideoModes
wxDisplay::DoGetModesDirectX(const wxVideoMode& WXUNUSED(modeMatch)) const
{
    wxArrayVideoModes modes;

    IDirectDraw2 *pDD = (*gs_displays)[m_index].m_pDD2;

    if ( pDD )
    {
        HRESULT hr = pDD->EnumDisplayModes
                          (
                            DDEDM_REFRESHRATES,
                            NULL,   // all modes (TODO: use modeMatch!)
                            &modes,   // callback parameter
                            wxDDEnumModesCallback
                          );

        if ( FAILED(hr) )
        {
            wxLogApiError(_T("IDirectDraw::EnumDisplayModes"), hr);
        }
    }

    return modes;
}

wxArrayVideoModes
wxDisplay::DoGetModesWindows(const wxVideoMode& modeMatch) const
{
    wxArrayVideoModes modes;

    const wxString name = GetNameForEnumSettings();

    const wxChar * const deviceName = name.empty() ? NULL : name.c_str();

    DEVMODE dm;
    for ( int iModeNum = 0;
          ::EnumDisplaySettings(deviceName, iModeNum, &dm);
          iModeNum++ )
    {
        const wxVideoMode mode = ConvertToVideoMode(dm);
        if ( mode.Matches(modeMatch) )
        {
            modes.Add(mode);
        }
    }

    return modes;
}

wxArrayVideoModes wxDisplay::GetModes(const wxVideoMode& modeMatch) const
{
    return gs_useDirectX ? DoGetModesDirectX(modeMatch)
                         : DoGetModesWindows(modeMatch);
}

wxVideoMode wxDisplay::GetCurrentMode() const
{
    wxVideoMode mode;

    const wxString name = GetNameForEnumSettings();

    DEVMODE dm;
    if ( !::EnumDisplaySettings(name.empty() ? NULL : name.c_str(),
                                ENUM_CURRENT_SETTINGS,
                                &dm) )
    {
        wxLogLastError(_T("EnumDisplaySettings(ENUM_CURRENT_SETTINGS)"));
    }
    else
    {
        mode = ConvertToVideoMode(dm);
    }

    return mode;
}

// ----------------------------------------------------------------------------
// video mode switching
// ----------------------------------------------------------------------------

bool wxDisplay::DoChangeModeDirectX(const wxVideoMode& mode)
{
    IDirectDraw2 *pDD = (*gs_displays)[m_index].m_pDD2;
    if ( !pDD )
        return false;

    wxWindow *winTop = wxTheApp->GetTopWindow();
    wxCHECK_MSG( winTop, false, _T("top level window required for DirectX") );

    HRESULT hr = pDD->SetCooperativeLevel
                      (
                        GetHwndOf(winTop),
                        DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN
                      );
    if ( FAILED(hr) )
    {
        wxLogApiError(_T("IDirectDraw::SetCooperativeLevel"), hr);

        return false;
    }

    hr = pDD->SetDisplayMode(mode.w, mode.h, mode.bpp, mode.refresh, 0);
    if ( FAILED(hr) )
    {
        wxLogApiError(_T("IDirectDraw::SetDisplayMode"), hr);

        return false;
    }


    return true;
}

bool wxDisplay::DoChangeModeWindows(const wxVideoMode& mode)
{
    // prepare ChangeDisplaySettingsEx() parameters
    DEVMODE dm,
           *pDevMode;
    int flags;

    if ( mode == wxDefaultVideoMode )
    {
        // reset the video mode to default
        pDevMode = NULL;
        flags = 0;
    }
    else // change to the given mode
    {
        wxCHECK_MSG( mode.w && mode.h, false,
                        _T("at least the width and height must be specified") );

        wxZeroMemory(dm);
        dm.dmSize = sizeof(dm);
        dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
        dm.dmPelsWidth = mode.w;
        dm.dmPelsHeight = mode.h;

        if ( mode.bpp )
        {
            dm.dmFields |= DM_BITSPERPEL;
            dm.dmBitsPerPel = mode.bpp;
        }

        if ( mode.refresh )
        {
            dm.dmFields |= DM_DISPLAYFREQUENCY;
            dm.dmDisplayFrequency = mode.refresh;
        }

        pDevMode = &dm;

        flags = CDS_FULLSCREEN;
    }


    // get pointer to the function dynamically
    //
    // we're only called from the main thread, so it's ok to use static
    // variable
    static ChangeDisplaySettingsEx_t pfnChangeDisplaySettingsEx = NULL;
    if ( !pfnChangeDisplaySettingsEx )
    {
        wxDynamicLibrary dllUser32(_T("user32.dll"));
        if ( dllUser32.IsLoaded() )
        {
            pfnChangeDisplaySettingsEx = (ChangeDisplaySettingsEx_t)
                dllUser32.GetSymbol(WINFUNC(ChangeDisplaySettingsEx));
        }
        //else: huh, no user32.dll??

        if ( !pfnChangeDisplaySettingsEx )
        {
            // we must be under Win95 and so there is no multiple monitors
            // support anyhow
            pfnChangeDisplaySettingsEx = ChangeDisplaySettingsExForWin95;
        }
    }

    // do change the mode
    switch ( pfnChangeDisplaySettingsEx
             (
                GetName(),      // display name
                pDevMode,       // dev mode or NULL to reset
                NULL,           // reserved
                flags,
                NULL            // pointer to video parameters (not used)
             ) )
    {
        case DISP_CHANGE_SUCCESSFUL:
            // ok
            {
                // If we have a top-level, full-screen frame, emulate
                // the DirectX behavior and resize it.  This makes this
                // API quite a bit easier to use.
                wxWindow *winTop = wxTheApp->GetTopWindow();
                wxFrame *frameTop = wxDynamicCast(winTop, wxFrame);
                if (frameTop && frameTop->IsFullScreen())
                {
                    wxVideoMode current = GetCurrentMode();
                    frameTop->SetClientSize(current.w, current.h);
                }
            }
            return true;

        case DISP_CHANGE_BADMODE:
            // don't complain about this, this is the only "expected" error
            break;

        default:
            wxFAIL_MSG( _T("unexpected ChangeDisplaySettingsEx() return value") );
    }

    return false;
}

bool wxDisplay::ChangeMode(const wxVideoMode& mode)
{
    return gs_useDirectX ? DoChangeModeDirectX(mode)
                         : DoChangeModeWindows(mode);
}

#endif // wxUSE_DISPLAY