src/msw/display.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/display.cpp
   3 // Purpose:     MSW Implementation of wxDisplay class
   4 // Author:      Royce Mitchell III, Vadim Zeitlin
   5 // Modified by: Ryan Norton (IsPrimary override)
   6 // Created:     06/21/02
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Copyright:   (c) 2002-2006 wxWidgets team
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 // ===========================================================================
  14 // declarations
  15 // ===========================================================================
  16
  17 // ---------------------------------------------------------------------------
  18 // headers
  19 // ---------------------------------------------------------------------------
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25     #pragma hdrstop
  26 #endif
  27
  28 #if wxUSE_DISPLAY
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/dynarray.h"
  32     #include "wx/app.h"
  33     #include "wx/frame.h"
  34 #endif
  35
  36 #include "wx/dynload.h"
  37 #include "wx/sysopt.h"
  38
  39 #include "wx/display.h"
  40 #include "wx/display_impl.h"
  41
  42 // define this to use DirectDraw for display mode switching: this is disabled
  43 // by default because ddraw.h is now always available and also it's not really
  44 // clear what are the benefits of using DirectDraw compared to the standard API
  45
  46 #if !defined(wxUSE_DIRECTDRAW)
  47     #define wxUSE_DIRECTDRAW 0
  48 #endif
  49
  50 #ifndef __WXWINCE__
  51     // Older versions of windef.h don't define HMONITOR.  Unfortunately, we
  52     // can't directly test whether HMONITOR is defined or not in windef.h as
  53     // it's not a macro but a typedef, so we test for an unrelated symbol which
  54     // is only defined in winuser.h if WINVER >= 0x0500
  55     #if !defined(HMONITOR_DECLARED) && !defined(MNS_NOCHECK)
  56         DECLARE_HANDLE(HMONITOR);
  57         typedef BOOL(CALLBACK * MONITORENUMPROC )(HMONITOR, HDC, LPRECT, LPARAM);
  58         typedef struct tagMONITORINFO
  59         {
  60             DWORD   cbSize;
  61             RECT    rcMonitor;
  62             RECT    rcWork;
  63             DWORD   dwFlags;
  64         } MONITORINFO, *LPMONITORINFO;
  65         typedef struct tagMONITORINFOEX : public tagMONITORINFO
  66         {
  67             TCHAR       szDevice[CCHDEVICENAME];
  68         } MONITORINFOEX, *LPMONITORINFOEX;
  69         #define MONITOR_DEFAULTTONULL       0x00000000
  70         #define MONITOR_DEFAULTTOPRIMARY    0x00000001
  71         #define MONITOR_DEFAULTTONEAREST    0x00000002
  72         #define MONITORINFOF_PRIMARY        0x00000001
  73         #define HMONITOR_DECLARED
  74     #endif
  75 #endif // !__WXWINCE__
  76
  77 #if wxUSE_DIRECTDRAW
  78     #include <ddraw.h>
  79
  80     // we don't want to link with ddraw.lib which contains the real
  81     // IID_IDirectDraw2 definition
  82     const GUID wxIID_IDirectDraw2 =
  83      { 0xB3A6F3E0, 0x2B43, 0x11CF, { 0xA2,0xDE,0x00,0xAA,0x00,0xB9,0x33,0x56 } };
  84 #endif // wxUSE_DIRECTDRAW
  85
  86 // ----------------------------------------------------------------------------
  87 // typedefs for dynamically loaded Windows functions
  88 // ----------------------------------------------------------------------------
  89
  90 typedef LONG (WINAPI *ChangeDisplaySettingsEx_t)(LPCTSTR lpszDeviceName,
  91                                                  LPDEVMODE lpDevMode,
  92                                                  HWND hwnd,
  93                                                  DWORD dwFlags,
  94                                                  LPVOID lParam);
  95
  96 #if wxUSE_DIRECTDRAW
  97 typedef BOOL (PASCAL *DDEnumExCallback_t)(GUID *pGuid,
  98                                           LPTSTR driverDescription,
  99                                           LPTSTR driverName,
 100                                           LPVOID lpContext,
 101                                           HMONITOR hmon);
 102
 103 typedef HRESULT (WINAPI *DirectDrawEnumerateEx_t)(DDEnumExCallback_t lpCallback,
 104                                                   LPVOID lpContext,
 105                                                   DWORD dwFlags);
 106
 107 typedef HRESULT (WINAPI *DirectDrawCreate_t)(GUID *lpGUID,
 108                                              LPDIRECTDRAW *lplpDD,
 109                                              IUnknown *pUnkOuter);
 110 #endif // wxUSE_DIRECTDRAW
 111
 112 typedef BOOL (WINAPI *EnumDisplayMonitors_t)(HDC,LPCRECT,MONITORENUMPROC,LPARAM);
 113 typedef HMONITOR (WINAPI *MonitorFromPoint_t)(POINT,DWORD);
 114 typedef HMONITOR (WINAPI *MonitorFromWindow_t)(HWND,DWORD);
 115 typedef BOOL (WINAPI *GetMonitorInfo_t)(HMONITOR,LPMONITORINFO);
 116
 117 #ifndef __WXWINCE__
 118 // emulation of ChangeDisplaySettingsEx() for Win95
 119 LONG WINAPI ChangeDisplaySettingsExForWin95(LPCTSTR WXUNUSED(lpszDeviceName),
 120                                             LPDEVMODE lpDevMode,
 121                                             HWND WXUNUSED(hwnd),
 122                                             DWORD dwFlags,
 123                                             LPVOID WXUNUSED(lParam))
 124 {
 125     return ::ChangeDisplaySettings(lpDevMode, dwFlags);
 126 }
 127 #endif // !__WXWINCE__
 128
 129 // ----------------------------------------------------------------------------
 130 // display information classes
 131 // ----------------------------------------------------------------------------
 132
 133 struct wxDisplayInfo
 134 {
 135     wxDisplayInfo(HMONITOR hmon = NULL)
 136     {
 137         m_hmon = hmon;
 138         m_flags = (DWORD)-1;
 139     }
 140
 141     virtual ~wxDisplayInfo() { }
 142
 143
 144     // use GetMonitorInfo() to fill in all of our fields if needed (i.e. if it
 145     // hadn't been done before)
 146     void Initialize();
 147
 148
 149     // handle of this monitor used by MonitorXXX() functions, never NULL
 150     HMONITOR m_hmon;
 151
 152     // the entire area of this monitor in virtual screen coordinates
 153     wxRect m_rect;
 154
 155     // the work or client area, i.e. the area available for the normal windows
 156     wxRect m_rectClient;
 157
 158     // the display device name for this monitor, empty initially and retrieved
 159     // on demand by DoGetName()
 160     wxString m_devName;
 161
 162     // the flags of this monitor, also used as initialization marker: if this
 163     // is -1, GetMonitorInfo() hadn't been called yet
 164     DWORD m_flags;
 165 };
 166
 167 WX_DEFINE_ARRAY_PTR(wxDisplayInfo *, wxDisplayInfoArray);
 168
 169 // ----------------------------------------------------------------------------
 170 // common base class for all Win32 wxDisplayImpl versions
 171 // ----------------------------------------------------------------------------
 172
 173 class wxDisplayImplWin32Base : public wxDisplayImpl
 174 {
 175 public:
 176     wxDisplayImplWin32Base(size_t n, wxDisplayInfo& info)
 177         : wxDisplayImpl(n),
 178           m_info(info)
 179     {
 180     }
 181
 182     virtual wxRect GetGeometry() const;
 183     virtual wxRect GetClientArea() const;
 184     virtual wxString GetName() const;
 185     virtual bool IsPrimary() const;
 186
 187     virtual wxVideoMode GetCurrentMode() const;
 188
 189 protected:
 190     // convert a DEVMODE to our wxVideoMode
 191     static wxVideoMode ConvertToVideoMode(const DEVMODE& dm)
 192     {
 193         // note that dmDisplayFrequency may be 0 or 1 meaning "standard one"
 194         // and although 0 is ok for us we don't want to return modes with 1hz
 195         // refresh
 196         return wxVideoMode(dm.dmPelsWidth,
 197                            dm.dmPelsHeight,
 198                            dm.dmBitsPerPel,
 199                            dm.dmDisplayFrequency > 1 ? dm.dmDisplayFrequency : 0);
 200     }
 201
 202     wxDisplayInfo& m_info;
 203 };
 204
 205 // ----------------------------------------------------------------------------
 206 // common base class for all Win32 wxDisplayFactory versions
 207 // ----------------------------------------------------------------------------
 208
 209 // functions dynamically bound by wxDisplayFactoryWin32Base::Initialize()
 210 static MonitorFromPoint_t gs_MonitorFromPoint = NULL;
 211 static MonitorFromWindow_t gs_MonitorFromWindow = NULL;
 212 static GetMonitorInfo_t gs_GetMonitorInfo = NULL;
 213
 214 class wxDisplayFactoryWin32Base : public wxDisplayFactory
 215 {
 216 public:
 217     virtual ~wxDisplayFactoryWin32Base();
 218
 219     bool IsOk() const { return !m_displays.empty(); }
 220
 221     virtual size_t GetCount() { return m_displays.size(); }
 222     virtual int GetFromPoint(const wxPoint& pt);
 223     virtual int GetFromWindow(wxWindow *window);
 224
 225 protected:
 226     // ctor checks if the current system supports multimon API and dynamically
 227     // bind the functions we need if this is the case and sets
 228     // ms_supportsMultimon if they're available
 229     wxDisplayFactoryWin32Base();
 230
 231     // delete all m_displays elements: can be called from the derived class
 232     // dtor if it is important to do this before destroying it (as in
 233     // wxDisplayFactoryDirectDraw case), otherwise will be done by our dtor
 234     void Clear();
 235
 236     // find the monitor corresponding to the given handle, return wxNOT_FOUND
 237     // if not found
 238     int FindDisplayFromHMONITOR(HMONITOR hmon) const;
 239
 240
 241     // flag indicating whether gs_MonitorXXX functions are available
 242     static int ms_supportsMultimon;
 243
 244     // the array containing information about all available displays, should be
 245     // filled by the derived class ctors
 246     wxDisplayInfoArray m_displays;
 247
 248
 249     DECLARE_NO_COPY_CLASS(wxDisplayFactoryWin32Base)
 250 };
 251
 252 // ----------------------------------------------------------------------------
 253 // wxDisplay implementation using Windows multi-monitor support functions
 254 // ----------------------------------------------------------------------------
 255
 256 class wxDisplayImplMultimon : public wxDisplayImplWin32Base
 257 {
 258 public:
 259     wxDisplayImplMultimon(size_t n, wxDisplayInfo& info)
 260         : wxDisplayImplWin32Base(n, info)
 261     {
 262     }
 263
 264     virtual wxArrayVideoModes GetModes(const wxVideoMode& mode) const;
 265     virtual bool ChangeMode(const wxVideoMode& mode);
 266
 267 private:
 268     DECLARE_NO_COPY_CLASS(wxDisplayImplMultimon)
 269 };
 270
 271 class wxDisplayFactoryMultimon : public wxDisplayFactoryWin32Base
 272 {
 273 public:
 274     wxDisplayFactoryMultimon();
 275
 276     virtual wxDisplayImpl *CreateDisplay(size_t n);
 277
 278 private:
 279     // EnumDisplayMonitors() callback
 280     static BOOL CALLBACK MultimonEnumProc(HMONITOR hMonitor,
 281                                           HDC hdcMonitor,
 282                                           LPRECT lprcMonitor,
 283                                           LPARAM dwData);
 284
 285
 286     // add a monitor description to m_displays array
 287     void AddDisplay(HMONITOR hMonitor, LPRECT lprcMonitor);
 288 };
 289
 290 // ----------------------------------------------------------------------------
 291 // wxDisplay implementation using DirectDraw
 292 // ----------------------------------------------------------------------------
 293
 294 #if wxUSE_DIRECTDRAW
 295
 296 struct wxDisplayInfoDirectDraw : wxDisplayInfo
 297 {
 298     wxDisplayInfoDirectDraw(const GUID& guid, HMONITOR hmon, LPTSTR name)
 299         : wxDisplayInfo(hmon),
 300           m_guid(guid)
 301     {
 302         m_pDD2 = NULL;
 303         m_devName = name;
 304     }
 305
 306     virtual ~wxDisplayInfoDirectDraw()
 307     {
 308         if ( m_pDD2 )
 309             m_pDD2->Release();
 310     }
 311
 312
 313     // IDirectDraw object used to control this display, may be NULL
 314     IDirectDraw2 *m_pDD2;
 315
 316     // DirectDraw GUID for this display, only valid when using DirectDraw
 317     const GUID m_guid;
 318
 319
 320     DECLARE_NO_COPY_CLASS(wxDisplayInfoDirectDraw)
 321 };
 322
 323 class wxDisplayImplDirectDraw : public wxDisplayImplWin32Base
 324 {
 325 public:
 326     wxDisplayImplDirectDraw(size_t n, wxDisplayInfo& info, IDirectDraw2 *pDD2)
 327         : wxDisplayImplWin32Base(n, info),
 328           m_pDD2(pDD2)
 329     {
 330         m_pDD2->AddRef();
 331     }
 332
 333     virtual ~wxDisplayImplDirectDraw()
 334     {
 335         m_pDD2->Release();
 336     }
 337
 338     virtual wxArrayVideoModes GetModes(const wxVideoMode& mode) const;
 339     virtual bool ChangeMode(const wxVideoMode& mode);
 340
 341 private:
 342     IDirectDraw2 *m_pDD2;
 343
 344     DECLARE_NO_COPY_CLASS(wxDisplayImplDirectDraw)
 345 };
 346
 347 class wxDisplayFactoryDirectDraw : public wxDisplayFactoryWin32Base
 348 {
 349 public:
 350     wxDisplayFactoryDirectDraw();
 351     virtual ~wxDisplayFactoryDirectDraw();
 352
 353     virtual wxDisplayImpl *CreateDisplay(size_t n);
 354
 355 private:
 356     // callback used with DirectDrawEnumerateEx()
 357     static BOOL WINAPI DDEnumExCallback(GUID *pGuid,
 358                                         LPTSTR driverDescription,
 359                                         LPTSTR driverName,
 360                                         LPVOID lpContext,
 361                                         HMONITOR hmon);
 362
 363     // add a monitor description to m_displays array
 364     void AddDisplay(const GUID& guid, HMONITOR hmon, LPTSTR name);
 365
 366
 367     // ddraw.dll
 368     wxDynamicLibrary m_dllDDraw;
 369
 370     // dynamically resolved DirectDrawCreate()
 371     DirectDrawCreate_t m_pfnDirectDrawCreate;
 372
 373     DECLARE_NO_COPY_CLASS(wxDisplayFactoryDirectDraw)
 374 };
 375
 376 #endif // wxUSE_DIRECTDRAW
 377
 378
 379 // ============================================================================
 380 // common classes implementation
 381 // ============================================================================
 382
 383 // ----------------------------------------------------------------------------
 384 // wxDisplay
 385 // ----------------------------------------------------------------------------
 386
 387 /* static */ wxDisplayFactory *wxDisplay::CreateFactory()
 388 {
 389     // we have 2 implementations for modern Windows: one using standard Win32
 390     // and another using DirectDraw, the choice between them is done using a
 391     // system option
 392
 393 #if wxUSE_DIRECTDRAW
 394     if ( wxSystemOptions::GetOptionInt(_T("msw.display.directdraw")) )
 395     {
 396         wxDisplayFactoryDirectDraw *factoryDD = new wxDisplayFactoryDirectDraw;
 397         if ( factoryDD->IsOk() )
 398             return factoryDD;
 399
 400         delete factoryDD;
 401     }
 402 #endif // wxUSE_DIRECTDRAW
 403
 404     wxDisplayFactoryMultimon *factoryMM = new wxDisplayFactoryMultimon;
 405     if ( factoryMM->IsOk() )
 406         return factoryMM;
 407
 408     delete factoryMM;
 409
 410
 411     // finally fall back to a stub implementation if all else failed (Win95?)
 412     return new wxDisplayFactorySingle;
 413 }
 414
 415 // ----------------------------------------------------------------------------
 416 // wxDisplayInfo
 417 // ----------------------------------------------------------------------------
 418
 419 void wxDisplayInfo::Initialize()
 420 {
 421     if ( m_flags == (DWORD)-1 )
 422     {
 423         WinStruct<MONITORINFOEX> monInfo;
 424         if ( !gs_GetMonitorInfo(m_hmon, (LPMONITORINFO)&monInfo) )
 425         {
 426             wxLogLastError(_T("GetMonitorInfo"));
 427             m_flags = 0;
 428             return;
 429         }
 430
 431         wxCopyRECTToRect(monInfo.rcMonitor, m_rect);
 432         wxCopyRECTToRect(monInfo.rcWork, m_rectClient);
 433         m_devName = monInfo.szDevice;
 434         m_flags = monInfo.dwFlags;
 435     }
 436 }
 437
 438 // ----------------------------------------------------------------------------
 439 // wxDisplayImplWin32Base
 440 // ----------------------------------------------------------------------------
 441
 442 wxRect wxDisplayImplWin32Base::GetGeometry() const
 443 {
 444     if ( m_info.m_rect.IsEmpty() )
 445         m_info.Initialize();
 446
 447     return m_info.m_rect;
 448 }
 449
 450 wxRect wxDisplayImplWin32Base::GetClientArea() const
 451 {
 452     if ( m_info.m_rectClient.IsEmpty() )
 453         m_info.Initialize();
 454
 455     return m_info.m_rectClient;
 456 }
 457
 458 wxString wxDisplayImplWin32Base::GetName() const
 459 {
 460     if ( m_info.m_devName.IsEmpty() )
 461         m_info.Initialize();
 462
 463     return m_info.m_devName;
 464 }
 465
 466 bool wxDisplayImplWin32Base::IsPrimary() const
 467 {
 468     if ( m_info.m_flags == (DWORD)-1 )
 469         m_info.Initialize();
 470
 471     return (m_info.m_flags & MONITORINFOF_PRIMARY) != 0;
 472 }
 473
 474 wxVideoMode wxDisplayImplWin32Base::GetCurrentMode() const
 475 {
 476     wxVideoMode mode;
 477
 478     // The first parameter of EnumDisplaySettings() must be NULL under Win95
 479     // according to MSDN.  The version of GetName() we implement for Win95
 480     // returns an empty string.
 481     const wxString name = GetName();
 482     const wxChar * const deviceName = name.empty() ? NULL : name.c_str();
 483
 484     DEVMODE dm;
 485     dm.dmSize = sizeof(dm);
 486     dm.dmDriverExtra = 0;
 487     if ( !::EnumDisplaySettings(deviceName, ENUM_CURRENT_SETTINGS, &dm) )
 488     {
 489         wxLogLastError(_T("EnumDisplaySettings(ENUM_CURRENT_SETTINGS)"));
 490     }
 491     else
 492     {
 493         mode = ConvertToVideoMode(dm);
 494     }
 495
 496     return mode;
 497 }
 498
 499 // ----------------------------------------------------------------------------
 500 // wxDisplayFactoryWin32Base
 501 // ----------------------------------------------------------------------------
 502
 503 int wxDisplayFactoryWin32Base::ms_supportsMultimon = -1;
 504
 505 wxDisplayFactoryWin32Base::wxDisplayFactoryWin32Base()
 506 {
 507     if ( ms_supportsMultimon == -1 )
 508     {
 509         ms_supportsMultimon = 0;
 510
 511         wxDynamicLibrary dllUser32(_T("user32.dll"));
 512
 513         wxLogNull noLog;
 514
 515         gs_MonitorFromPoint = (MonitorFromPoint_t)
 516             dllUser32.GetSymbol(wxT("MonitorFromPoint"));
 517         if ( !gs_MonitorFromPoint )
 518             return;
 519
 520         gs_MonitorFromWindow = (MonitorFromWindow_t)
 521             dllUser32.GetSymbol(wxT("MonitorFromWindow"));
 522         if ( !gs_MonitorFromWindow )
 523             return;
 524
 525         gs_GetMonitorInfo = (GetMonitorInfo_t)
 526             dllUser32.GetSymbolAorW(wxT("GetMonitorInfo"));
 527         if ( !gs_GetMonitorInfo )
 528             return;
 529
 530         ms_supportsMultimon = 1;
 531
 532         // we can safely let dllUser32 go out of scope, the DLL itself will
 533         // still remain loaded as all Win32 programs use it
 534     }
 535 }
 536
 537 void wxDisplayFactoryWin32Base::Clear()
 538 {
 539     WX_CLEAR_ARRAY(m_displays);
 540 }
 541
 542 wxDisplayFactoryWin32Base::~wxDisplayFactoryWin32Base()
 543 {
 544     Clear();
 545 }
 546
 547 // helper for GetFromPoint() and GetFromWindow()
 548 int wxDisplayFactoryWin32Base::FindDisplayFromHMONITOR(HMONITOR hmon) const
 549 {
 550     if ( hmon )
 551     {
 552         const size_t count = m_displays.size();
 553         for ( size_t n = 0; n < count; n++ )
 554         {
 555             if ( hmon == m_displays[n]->m_hmon )
 556                 return n;
 557         }
 558     }
 559
 560     return wxNOT_FOUND;
 561 }
 562
 563 int wxDisplayFactoryWin32Base::GetFromPoint(const wxPoint& pt)
 564 {
 565     POINT pt2;
 566     pt2.x = pt.x;
 567     pt2.y = pt.y;
 568
 569     return FindDisplayFromHMONITOR(gs_MonitorFromPoint(pt2,
 570                                                        MONITOR_DEFAULTTONULL));
 571 }
 572
 573 int wxDisplayFactoryWin32Base::GetFromWindow(wxWindow *window)
 574 {
 575     return FindDisplayFromHMONITOR(gs_MonitorFromWindow(GetHwndOf(window),
 576                                                         MONITOR_DEFAULTTONULL));
 577 }
 578
 579 // ============================================================================
 580 // wxDisplay implementation using Win32 multimon API
 581 // ============================================================================
 582
 583 // ----------------------------------------------------------------------------
 584 // wxDisplayFactoryMultimon initialization
 585 // ----------------------------------------------------------------------------
 586
 587 wxDisplayFactoryMultimon::wxDisplayFactoryMultimon()
 588 {
 589     if ( !ms_supportsMultimon )
 590         return;
 591
 592     // look up EnumDisplayMonitors() which we don't need with DirectDraw
 593     // implementation
 594     EnumDisplayMonitors_t pfnEnumDisplayMonitors;
 595     {
 596         wxLogNull noLog;
 597
 598         wxDynamicLibrary dllUser32(_T("user32.dll"));
 599         pfnEnumDisplayMonitors = (EnumDisplayMonitors_t)
 600             dllUser32.GetSymbol(wxT("EnumDisplayMonitors"));
 601         if ( !pfnEnumDisplayMonitors )
 602             return;
 603     }
 604
 605     // enumerate all displays
 606     if ( !pfnEnumDisplayMonitors(NULL, NULL, MultimonEnumProc, (LPARAM)this) )
 607     {
 608         wxLogLastError(wxT("EnumDisplayMonitors"));
 609     }
 610 }
 611
 612 /* static */
 613 BOOL CALLBACK
 614 wxDisplayFactoryMultimon::MultimonEnumProc(
 615   HMONITOR hMonitor,        // handle to display monitor
 616   HDC WXUNUSED(hdcMonitor), // handle to monitor-appropriate device context
 617   LPRECT lprcMonitor,       // pointer to monitor intersection rectangle
 618   LPARAM dwData             // data passed from EnumDisplayMonitors (this)
 619 )
 620 {
 621     wxDisplayFactoryMultimon *const self = (wxDisplayFactoryMultimon *)dwData;
 622     self->AddDisplay(hMonitor, lprcMonitor);
 623
 624     // continue the enumeration
 625     return TRUE;
 626 }
 627
 628 // ----------------------------------------------------------------------------
 629 // wxDisplayFactoryMultimon helper functions
 630 // ----------------------------------------------------------------------------
 631
 632 void wxDisplayFactoryMultimon::AddDisplay(HMONITOR hMonitor, LPRECT lprcMonitor)
 633 {
 634     wxDisplayInfo *info = new wxDisplayInfo(hMonitor);
 635
 636     // we also store the display geometry
 637     info->m_rect = wxRect(lprcMonitor->left, lprcMonitor->top,
 638                           lprcMonitor->right - lprcMonitor->left,
 639                           lprcMonitor->bottom - lprcMonitor->top);
 640
 641     // now add this monitor to the array
 642     m_displays.Add(info);
 643 }
 644
 645 // ----------------------------------------------------------------------------
 646 // wxDisplayFactoryMultimon inherited pure virtuals implementation
 647 // ----------------------------------------------------------------------------
 648
 649 wxDisplayImpl *wxDisplayFactoryMultimon::CreateDisplay(size_t n)
 650 {
 651     wxCHECK_MSG( n < m_displays.size(), NULL, _T("invalid display index") );
 652
 653     return new wxDisplayImplMultimon(n, *(m_displays[n]));
 654 }
 655
 656 // ----------------------------------------------------------------------------
 657 // wxDisplayImplMultimon implementation
 658 // ----------------------------------------------------------------------------
 659
 660 wxArrayVideoModes
 661 wxDisplayImplMultimon::GetModes(const wxVideoMode& modeMatch) const
 662 {
 663     wxArrayVideoModes modes;
 664
 665     // The first parameter of EnumDisplaySettings() must be NULL under Win95
 666     // according to MSDN.  The version of GetName() we implement for Win95
 667     // returns an empty string.
 668     const wxString name = GetName();
 669     const wxChar * const deviceName = name.empty() ? NULL : name.c_str();
 670
 671     DEVMODE dm;
 672     dm.dmSize = sizeof(dm);
 673     dm.dmDriverExtra = 0;
 674     for ( int iModeNum = 0;
 675           ::EnumDisplaySettings(deviceName, iModeNum, &dm);
 676           iModeNum++ )
 677     {
 678         const wxVideoMode mode = ConvertToVideoMode(dm);
 679         if ( mode.Matches(modeMatch) )
 680         {
 681             modes.Add(mode);
 682         }
 683     }
 684
 685     return modes;
 686 }
 687
 688 bool wxDisplayImplMultimon::ChangeMode(const wxVideoMode& mode)
 689 {
 690     // prepare ChangeDisplaySettingsEx() parameters
 691     DEVMODE dm;
 692     DEVMODE *pDevMode;
 693
 694     int flags;
 695
 696     if ( mode == wxDefaultVideoMode )
 697     {
 698         // reset the video mode to default
 699         pDevMode = NULL;
 700         flags = 0;
 701     }
 702     else // change to the given mode
 703     {
 704         wxCHECK_MSG( mode.w && mode.h, false,
 705                         _T("at least the width and height must be specified") );
 706
 707         wxZeroMemory(dm);
 708         dm.dmSize = sizeof(dm);
 709         dm.dmDriverExtra = 0;
 710         dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
 711         dm.dmPelsWidth = mode.w;
 712         dm.dmPelsHeight = mode.h;
 713
 714         if ( mode.bpp )
 715         {
 716             dm.dmFields |= DM_BITSPERPEL;
 717             dm.dmBitsPerPel = mode.bpp;
 718         }
 719
 720         if ( mode.refresh )
 721         {
 722             dm.dmFields |= DM_DISPLAYFREQUENCY;
 723             dm.dmDisplayFrequency = mode.refresh;
 724         }
 725
 726         pDevMode = &dm;
 727
 728 #ifdef __WXWINCE__
 729         flags = 0;
 730 #else // !__WXWINCE__
 731         flags = CDS_FULLSCREEN;
 732 #endif // __WXWINCE__/!__WXWINCE__
 733     }
 734
 735
 736     // get pointer to the function dynamically
 737     //
 738     // we're only called from the main thread, so it's ok to use static
 739     // variable
 740     static ChangeDisplaySettingsEx_t pfnChangeDisplaySettingsEx = NULL;
 741     if ( !pfnChangeDisplaySettingsEx )
 742     {
 743         wxDynamicLibrary dllUser32(_T("user32.dll"));
 744         if ( dllUser32.IsLoaded() )
 745         {
 746             pfnChangeDisplaySettingsEx = (ChangeDisplaySettingsEx_t)
 747                 dllUser32.GetSymbolAorW(_T("ChangeDisplaySettingsEx"));
 748         }
 749         //else: huh, no user32.dll??
 750
 751 #ifndef __WXWINCE__
 752         if ( !pfnChangeDisplaySettingsEx )
 753         {
 754             // we must be under Win95 and so there is no multiple monitors
 755             // support anyhow
 756             pfnChangeDisplaySettingsEx = ChangeDisplaySettingsExForWin95;
 757         }
 758 #endif // !__WXWINCE__
 759     }
 760
 761     // do change the mode
 762     switch ( pfnChangeDisplaySettingsEx
 763              (
 764                 GetName(),      // display name
 765                 pDevMode,       // dev mode or NULL to reset
 766                 NULL,           // reserved
 767                 flags,
 768                 NULL            // pointer to video parameters (not used)
 769              ) )
 770     {
 771         case DISP_CHANGE_SUCCESSFUL:
 772             // ok
 773             {
 774                 // If we have a top-level, full-screen frame, emulate
 775                 // the DirectX behavior and resize it.  This makes this
 776                 // API quite a bit easier to use.
 777                 wxWindow *winTop = wxTheApp->GetTopWindow();
 778                 wxFrame *frameTop = wxDynamicCast(winTop, wxFrame);
 779                 if (frameTop && frameTop->IsFullScreen())
 780                 {
 781                     wxVideoMode current = GetCurrentMode();
 782                     frameTop->SetClientSize(current.w, current.h);
 783                 }
 784             }
 785             return true;
 786
 787         case DISP_CHANGE_BADMODE:
 788             // don't complain about this, this is the only "expected" error
 789             break;
 790
 791         default:
 792             wxFAIL_MSG( _T("unexpected ChangeDisplaySettingsEx() return value") );
 793     }
 794
 795     return false;
 796 }
 797
 798
 799 // ============================================================================
 800 // DirectDraw-based wxDisplay implementation
 801 // ============================================================================
 802
 803 #if wxUSE_DIRECTDRAW
 804
 805 // ----------------------------------------------------------------------------
 806 // wxDisplayFactoryDirectDraw initialization
 807 // ----------------------------------------------------------------------------
 808
 809 wxDisplayFactoryDirectDraw::wxDisplayFactoryDirectDraw()
 810 {
 811     if ( !ms_supportsMultimon )
 812         return;
 813
 814 #if wxUSE_LOG
 815     // suppress the errors if ddraw.dll is not found, we're prepared to handle
 816     // this
 817     wxLogNull noLog;
 818 #endif
 819
 820     m_dllDDraw.Load(_T("ddraw.dll"));
 821
 822     if ( !m_dllDDraw.IsLoaded() )
 823         return;
 824
 825     DirectDrawEnumerateEx_t pDDEnumEx = (DirectDrawEnumerateEx_t)
 826         m_dllDDraw.GetSymbolAorW(_T("DirectDrawEnumerateEx"));
 827     if ( !pDDEnumEx )
 828         return;
 829
 830     // we can't continue without DirectDrawCreate() later, so resolve it right
 831     // now and fail the initialization if it's not available
 832     m_pfnDirectDrawCreate = (DirectDrawCreate_t)
 833         m_dllDDraw.GetSymbol(_T("DirectDrawCreate"));
 834     if ( !m_pfnDirectDrawCreate )
 835         return;
 836
 837     if ( (*pDDEnumEx)(DDEnumExCallback,
 838                       this,
 839                       DDENUM_ATTACHEDSECONDARYDEVICES) != DD_OK )
 840     {
 841         wxLogLastError(_T("DirectDrawEnumerateEx"));
 842     }
 843 }
 844
 845 wxDisplayFactoryDirectDraw::~wxDisplayFactoryDirectDraw()
 846 {
 847     // we must clear m_displays now, before m_dllDDraw is unloaded as otherwise
 848     // calling m_pDD2->Release() later would crash
 849     Clear();
 850 }
 851
 852 // ----------------------------------------------------------------------------
 853 // callbacks for monitor/modes enumeration stuff
 854 // ----------------------------------------------------------------------------
 855
 856 BOOL WINAPI
 857 wxDisplayFactoryDirectDraw::DDEnumExCallback(GUID *pGuid,
 858                                              LPTSTR WXUNUSED(driverDescription),
 859                                              LPTSTR driverName,
 860                                              LPVOID lpContext,
 861                                              HMONITOR hmon)
 862 {
 863     if ( pGuid )
 864     {
 865         wxDisplayFactoryDirectDraw * self =
 866             wx_static_cast(wxDisplayFactoryDirectDraw *, lpContext);
 867         self->AddDisplay(*pGuid, hmon, driverName);
 868     }
 869     //else: we're called for the primary monitor, skip it
 870
 871     // continue the enumeration
 872     return TRUE;
 873 }
 874
 875 // ----------------------------------------------------------------------------
 876 // wxDisplayFactoryDirectDraw helpers
 877 // ----------------------------------------------------------------------------
 878
 879 void wxDisplayFactoryDirectDraw::AddDisplay(const GUID& guid,
 880                                             HMONITOR hmon,
 881                                             LPTSTR name)
 882 {
 883     m_displays.Add(new wxDisplayInfoDirectDraw(guid, hmon, name));
 884 }
 885
 886 // ----------------------------------------------------------------------------
 887 // wxDisplayFactoryDirectDraw inherited pure virtuals implementation
 888 // ----------------------------------------------------------------------------
 889
 890 wxDisplayImpl *wxDisplayFactoryDirectDraw::CreateDisplay(size_t n)
 891 {
 892     wxCHECK_MSG( n < m_displays.size(), NULL, _T("invalid display index") );
 893
 894     wxDisplayInfoDirectDraw *
 895         info = wx_static_cast(wxDisplayInfoDirectDraw *, m_displays[n]);
 896
 897     if ( !info->m_pDD2 )
 898     {
 899         IDirectDraw *pDD;
 900         GUID guid(info->m_guid);
 901         HRESULT hr = (*m_pfnDirectDrawCreate)(&guid, &pDD, NULL);
 902
 903         if ( FAILED(hr) || !pDD )
 904         {
 905             // what to do??
 906             wxLogApiError(_T("DirectDrawCreate"), hr);
 907             return NULL;
 908         }
 909
 910         // we got IDirectDraw, but we need IDirectDraw2
 911         hr = pDD->QueryInterface(wxIID_IDirectDraw2, (void **)&info->m_pDD2);
 912         pDD->Release();
 913
 914         if ( FAILED(hr) || !info->m_pDD2 )
 915         {
 916             wxLogApiError(_T("IDirectDraw::QueryInterface(IDD2)"), hr);
 917             return NULL;
 918         }
 919
 920         // NB: m_pDD2 will now be only destroyed when m_displays is destroyed
 921         //     which is ok as we don't want to recreate DD objects all the time
 922     }
 923     //else: DirectDraw object corresponding to our display already exists
 924
 925     return new wxDisplayImplDirectDraw(n, *info, info->m_pDD2);
 926 }
 927
 928 // ============================================================================
 929 // wxDisplayImplDirectDraw
 930 // ============================================================================
 931
 932 // ----------------------------------------------------------------------------
 933 // video modes enumeration
 934 // ----------------------------------------------------------------------------
 935
 936 // tiny helper class used to pass information from GetModes() to
 937 // wxDDEnumModesCallback
 938 class wxDDVideoModesAdder
 939 {
 940 public:
 941     // our Add() method will add modes matching modeMatch to modes array
 942     wxDDVideoModesAdder(wxArrayVideoModes& modes, const wxVideoMode& modeMatch)
 943         : m_modes(modes),
 944           m_modeMatch(modeMatch)
 945     {
 946     }
 947
 948     void Add(const wxVideoMode& mode)
 949     {
 950         if ( mode.Matches(m_modeMatch) )
 951             m_modes.Add(mode);
 952     }
 953
 954 private:
 955     wxArrayVideoModes& m_modes;
 956     const wxVideoMode& m_modeMatch;
 957
 958     DECLARE_NO_COPY_CLASS(wxDDVideoModesAdder)
 959 };
 960
 961 HRESULT WINAPI wxDDEnumModesCallback(LPDDSURFACEDESC lpDDSurfaceDesc,
 962                                      LPVOID lpContext)
 963 {
 964     // we need at least the mode size
 965     static const DWORD FLAGS_REQUIRED = DDSD_HEIGHT | DDSD_WIDTH;
 966     if ( (lpDDSurfaceDesc->dwFlags & FLAGS_REQUIRED) == FLAGS_REQUIRED )
 967     {
 968         wxDDVideoModesAdder * const vmodes =
 969             wx_static_cast(wxDDVideoModesAdder *, lpContext);
 970
 971         vmodes->Add(wxVideoMode(lpDDSurfaceDesc->dwWidth,
 972                                 lpDDSurfaceDesc->dwHeight,
 973                                 lpDDSurfaceDesc->ddpfPixelFormat.dwRGBBitCount,
 974                                 lpDDSurfaceDesc->dwRefreshRate));
 975     }
 976
 977     // continue the enumeration
 978     return DDENUMRET_OK;
 979 }
 980
 981 wxArrayVideoModes
 982 wxDisplayImplDirectDraw::GetModes(const wxVideoMode& modeMatch) const
 983 {
 984     wxArrayVideoModes modes;
 985     wxDDVideoModesAdder modesAdder(modes, modeMatch);
 986
 987     HRESULT hr = m_pDD2->EnumDisplayModes
 988                          (
 989                             DDEDM_REFRESHRATES,
 990                             NULL,                   // all modes
 991                             &modesAdder,            // callback parameter
 992                             wxDDEnumModesCallback
 993                          );
 994
 995     if ( FAILED(hr) )
 996     {
 997         wxLogApiError(_T("IDirectDraw::EnumDisplayModes"), hr);
 998     }
 999
1000     return modes;
1001 }
1002
1003 // ----------------------------------------------------------------------------
1004 // video mode switching
1005 // ----------------------------------------------------------------------------
1006
1007 bool wxDisplayImplDirectDraw::ChangeMode(const wxVideoMode& mode)
1008 {
1009     wxWindow *winTop = wxTheApp->GetTopWindow();
1010     wxCHECK_MSG( winTop, false, _T("top level window required for DirectX") );
1011
1012     HRESULT hr = m_pDD2->SetCooperativeLevel
1013                          (
1014                             GetHwndOf(winTop),
1015                             DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN
1016                          );
1017     if ( FAILED(hr) )
1018     {
1019         wxLogApiError(_T("IDirectDraw2::SetCooperativeLevel"), hr);
1020
1021         return false;
1022     }
1023
1024     hr = m_pDD2->SetDisplayMode(mode.w, mode.h, mode.bpp, mode.refresh, 0);
1025     if ( FAILED(hr) )
1026     {
1027         wxLogApiError(_T("IDirectDraw2::SetDisplayMode"), hr);
1028
1029         return false;
1030     }
1031
1032     return true;
1033 }
1034
1035 #endif // wxUSE_DIRECTDRAW
1036
1037 #endif // wxUSE_DISPLAY