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/app.h"
  32    #include "wx/dynarray.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 // Mingw's w32api headers don't include ddraw.h, though the user may have
  43 // installed it.  If using configure, we actually probe for ddraw.h there
  44 // and set wxUSE_DIRECTDRAW.  Otherwise, assume we don't have it if using
  45 // the w32api headers, and that we do otherwise.
  46 #if !defined HAVE_W32API_H && !defined HAVE_DDRAW_H
  47     #define HAVE_DDRAW_H
  48 #endif
  49
  50 // user may disable compilation of DirectDraw code by setting
  51 // wxUSE_DIRECTDRAW to 0 in the makefile/project settings
  52 #if defined(HAVE_DDRAW_H) && !defined(wxUSE_DIRECTDRAW)
  53     #define wxUSE_DIRECTDRAW 1
  54 #endif
  55
  56 #ifndef __WXWINCE__
  57     // Older versions of windef.h don't define HMONITOR.  Unfortunately, we
  58     // can't directly test whether HMONITOR is defined or not in windef.h as
  59     // it's not a macro but a typedef, so we test for an unrelated symbol which
  60     // is only defined in winuser.h if WINVER >= 0x0500
  61     #if !defined(HMONITOR_DECLARED) && !defined(MNS_NOCHECK)
  62         DECLARE_HANDLE(HMONITOR);
  63         #define HMONITOR_DECLARED
  64     #endif
  65 #endif // !__WXWINCE__
  66
  67 #ifdef wxUSE_DIRECTDRAW
  68 #include <ddraw.h>
  69
  70 // we don't want to link with ddraw.lib which contains the real
  71 // IID_IDirectDraw2 definition
  72 const GUID wxIID_IDirectDraw2 =
  73     { 0xB3A6F3E0, 0x2B43, 0x11CF, { 0xA2,0xDE,0x00,0xAA,0x00,0xB9,0x33,0x56 } };
  74 #endif // wxUSE_DIRECTDRAW
  75
  76 // ----------------------------------------------------------------------------
  77 // typedefs for dynamically loaded Windows functions
  78 // ----------------------------------------------------------------------------
  79
  80 typedef LONG (WINAPI *ChangeDisplaySettingsEx_t)(LPCTSTR lpszDeviceName,
  81                                                  LPDEVMODE lpDevMode,
  82                                                  HWND hwnd,
  83                                                  DWORD dwFlags,
  84                                                  LPVOID lParam);
  85
  86 #ifdef wxUSE_DIRECTDRAW
  87 typedef BOOL (PASCAL *DDEnumExCallback_t)(GUID *pGuid,
  88                                           LPTSTR driverDescription,
  89                                           LPTSTR driverName,
  90                                           LPVOID lpContext,
  91                                           HMONITOR hmon);
  92
  93 typedef HRESULT (WINAPI *DirectDrawEnumerateEx_t)(DDEnumExCallback_t lpCallback,
  94                                                   LPVOID lpContext,
  95                                                   DWORD dwFlags);
  96
  97 typedef HRESULT (WINAPI *DirectDrawCreate_t)(GUID *lpGUID,
  98                                              LPDIRECTDRAW *lplpDD,
  99                                              IUnknown *pUnkOuter);
 100 #endif // wxUSE_DIRECTDRAW
 101
 102 typedef BOOL (WINAPI *EnumDisplayMonitors_t)(HDC,LPCRECT,MONITORENUMPROC,LPARAM);
 103 typedef HMONITOR (WINAPI *MonitorFromPoint_t)(POINT,DWORD);
 104 typedef HMONITOR (WINAPI *MonitorFromWindow_t)(HWND,DWORD);
 105 typedef BOOL (WINAPI *GetMonitorInfo_t)(HMONITOR,LPMONITORINFO);
 106
 107 #ifndef __WXWINCE__
 108 // emulation of ChangeDisplaySettingsEx() for Win95
 109 LONG WINAPI ChangeDisplaySettingsExForWin95(LPCTSTR WXUNUSED(lpszDeviceName),
 110                                             LPDEVMODE lpDevMode,
 111                                             HWND WXUNUSED(hwnd),
 112                                             DWORD dwFlags,
 113                                             LPVOID WXUNUSED(lParam))
 114 {
 115     return ::ChangeDisplaySettings(lpDevMode, dwFlags);
 116 }
 117 #endif // !__WXWINCE__
 118
 119 // ----------------------------------------------------------------------------
 120 // display information classes
 121 // ----------------------------------------------------------------------------
 122
 123 struct wxDisplayInfo
 124 {
 125     wxDisplayInfo(HMONITOR hmon = NULL)
 126     {
 127         m_hmon = hmon;
 128         m_flags = (DWORD)-1;
 129     }
 130
 131     virtual ~wxDisplayInfo() { }
 132
 133
 134     // use GetMonitorInfo() to fill in all of our fields if needed (i.e. if it
 135     // hadn't been done before)
 136     void Initialize();
 137
 138
 139     // handle of this monitor used by MonitorXXX() functions, never NULL
 140     HMONITOR m_hmon;
 141
 142     // the entire area of this monitor in virtual screen coordinates
 143     wxRect m_rect;
 144
 145     // the display device name for this monitor, empty initially and retrieved
 146     // on demand by DoGetName()
 147     wxString m_devName;
 148
 149     // the flags of this monitor, also used as initialization marker: if this
 150     // is -1, GetMonitorInfo() hadn't been called yet
 151     DWORD m_flags;
 152 };
 153
 154 WX_DEFINE_ARRAY_PTR(wxDisplayInfo *, wxDisplayInfoArray);
 155
 156 // ----------------------------------------------------------------------------
 157 // common base class for all Win32 wxDisplayImpl versions
 158 // ----------------------------------------------------------------------------
 159
 160 class wxDisplayImplWin32Base : public wxDisplayImpl
 161 {
 162 public:
 163     wxDisplayImplWin32Base(size_t n, wxDisplayInfo& info)
 164         : wxDisplayImpl(n),
 165           m_info(info)
 166     {
 167     }
 168
 169     virtual wxRect GetGeometry() const;
 170     virtual wxString GetName() const;
 171     virtual bool IsPrimary() const;
 172
 173     virtual wxVideoMode GetCurrentMode() const;
 174
 175 protected:
 176     // convert a DEVMODE to our wxVideoMode
 177     static wxVideoMode ConvertToVideoMode(const DEVMODE& dm)
 178     {
 179         // note that dmDisplayFrequency may be 0 or 1 meaning "standard one"
 180         // and although 0 is ok for us we don't want to return modes with 1hz
 181         // refresh
 182         return wxVideoMode(dm.dmPelsWidth,
 183                            dm.dmPelsHeight,
 184                            dm.dmBitsPerPel,
 185                            dm.dmDisplayFrequency > 1 ? dm.dmDisplayFrequency : 0);
 186     }
 187
 188     wxDisplayInfo& m_info;
 189 };
 190
 191 // ----------------------------------------------------------------------------
 192 // common base class for all Win32 wxDisplayFactory versions
 193 // ----------------------------------------------------------------------------
 194
 195 // functions dynamically bound by wxDisplayFactoryWin32Base::Initialize()
 196 static MonitorFromPoint_t gs_MonitorFromPoint = NULL;
 197 static MonitorFromWindow_t gs_MonitorFromWindow = NULL;
 198 static GetMonitorInfo_t gs_GetMonitorInfo = NULL;
 199
 200 class wxDisplayFactoryWin32Base : public wxDisplayFactory
 201 {
 202 public:
 203     virtual ~wxDisplayFactoryWin32Base();
 204
 205     bool IsOk() const { return !m_displays.empty(); }
 206
 207     virtual size_t GetCount() { return m_displays.size(); }
 208     virtual int GetFromPoint(const wxPoint& pt);
 209     virtual int GetFromWindow(wxWindow *window);
 210
 211 protected:
 212     // ctor checks if the current system supports multimon API and dynamically
 213     // bind the functions we need if this is the case and sets
 214     // ms_supportsMultimon if they're available
 215     wxDisplayFactoryWin32Base();
 216
 217     // delete all m_displays elements: can be called from the derived class
 218     // dtor if it is important to do this before destroying it (as in
 219     // wxDisplayFactoryDirectDraw case), otherwise will be done by our dtor
 220     void Clear();
 221
 222     // find the monitor corresponding to the given handle, return wxNOT_FOUND
 223     // if not found
 224     int FindDisplayFromHMONITOR(HMONITOR hmon) const;
 225
 226
 227     // flag indicating whether gs_MonitorXXX functions are available
 228     static int ms_supportsMultimon;
 229
 230     // the array containing information about all available displays, should be
 231     // filled by the derived class ctors
 232     wxDisplayInfoArray m_displays;
 233
 234
 235     DECLARE_NO_COPY_CLASS(wxDisplayFactoryWin32Base)
 236 };
 237
 238 // ----------------------------------------------------------------------------
 239 // wxDisplay implementation using Windows multi-monitor support functions
 240 // ----------------------------------------------------------------------------
 241
 242 class wxDisplayImplMultimon : public wxDisplayImplWin32Base
 243 {
 244 public:
 245     wxDisplayImplMultimon(size_t n, wxDisplayInfo& info)
 246         : wxDisplayImplWin32Base(n, info)
 247     {
 248     }
 249
 250     virtual wxArrayVideoModes GetModes(const wxVideoMode& mode) const;
 251     virtual bool ChangeMode(const wxVideoMode& mode);
 252
 253 private:
 254     DECLARE_NO_COPY_CLASS(wxDisplayImplMultimon)
 255 };
 256
 257 class WXDLLEXPORT wxDisplayFactoryMultimon : public wxDisplayFactoryWin32Base
 258 {
 259 public:
 260     wxDisplayFactoryMultimon();
 261
 262     virtual wxDisplayImpl *CreateDisplay(size_t n);
 263
 264 private:
 265     // EnumDisplayMonitors() callback
 266     static BOOL CALLBACK MultimonEnumProc(HMONITOR hMonitor,
 267                                           HDC hdcMonitor,
 268                                           LPRECT lprcMonitor,
 269                                           LPARAM dwData);
 270
 271
 272     // add a monitor description to m_displays array
 273     void AddDisplay(HMONITOR hMonitor, LPRECT lprcMonitor);
 274 };
 275
 276 // ----------------------------------------------------------------------------
 277 // wxDisplay implementation using DirectDraw
 278 // ----------------------------------------------------------------------------
 279
 280 #ifdef wxUSE_DIRECTDRAW
 281
 282 struct wxDisplayInfoDirectDraw : wxDisplayInfo
 283 {
 284     wxDisplayInfoDirectDraw(const GUID& guid, HMONITOR hmon, LPTSTR name)
 285         : wxDisplayInfo(hmon),
 286           m_guid(guid)
 287     {
 288         m_pDD2 = NULL;
 289         m_devName = name;
 290     }
 291
 292     virtual ~wxDisplayInfoDirectDraw()
 293     {
 294         if ( m_pDD2 )
 295             m_pDD2->Release();
 296     }
 297
 298
 299     // IDirectDraw object used to control this display, may be NULL
 300     IDirectDraw2 *m_pDD2;
 301
 302     // DirectDraw GUID for this display, only valid when using DirectDraw
 303     const GUID m_guid;
 304
 305
 306     DECLARE_NO_COPY_CLASS(wxDisplayInfoDirectDraw)
 307 };
 308
 309 class wxDisplayImplDirectDraw : public wxDisplayImplWin32Base
 310 {
 311 public:
 312     wxDisplayImplDirectDraw(size_t n, wxDisplayInfo& info, IDirectDraw2 *pDD2)
 313         : wxDisplayImplWin32Base(n, info),
 314           m_pDD2(pDD2)
 315     {
 316         m_pDD2->AddRef();
 317     }
 318
 319     virtual ~wxDisplayImplDirectDraw()
 320     {
 321         m_pDD2->Release();
 322     }
 323
 324     virtual wxArrayVideoModes GetModes(const wxVideoMode& mode) const;
 325     virtual bool ChangeMode(const wxVideoMode& mode);
 326
 327 private:
 328     IDirectDraw2 *m_pDD2;
 329
 330     DECLARE_NO_COPY_CLASS(wxDisplayImplDirectDraw)
 331 };
 332
 333 class WXDLLEXPORT wxDisplayFactoryDirectDraw : public wxDisplayFactoryWin32Base
 334 {
 335 public:
 336     wxDisplayFactoryDirectDraw();
 337     virtual ~wxDisplayFactoryDirectDraw();
 338
 339     virtual wxDisplayImpl *CreateDisplay(size_t n);
 340
 341 private:
 342     // callback used with DirectDrawEnumerateEx()
 343     static BOOL WINAPI DDEnumExCallback(GUID *pGuid,
 344                                         LPTSTR driverDescription,
 345                                         LPTSTR driverName,
 346                                         LPVOID lpContext,
 347                                         HMONITOR hmon);
 348
 349     // add a monitor description to m_displays array
 350     void AddDisplay(const GUID& guid, HMONITOR hmon, LPTSTR name);
 351
 352
 353     // ddraw.dll
 354     wxDynamicLibrary m_dllDDraw;
 355
 356     // dynamically resolved DirectDrawCreate()
 357     DirectDrawCreate_t m_pfnDirectDrawCreate;
 358
 359     DECLARE_NO_COPY_CLASS(wxDisplayFactoryDirectDraw)
 360 };
 361
 362 #endif // wxUSE_DIRECTDRAW
 363
 364
 365 // ============================================================================
 366 // common classes implementation
 367 // ============================================================================
 368
 369 // ----------------------------------------------------------------------------
 370 // wxDisplay
 371 // ----------------------------------------------------------------------------
 372
 373 /* static */ wxDisplayFactory *wxDisplay::CreateFactory()
 374 {
 375     // we have 2 implementations for modern Windows: one using standard Win32
 376     // and another using DirectDraw, the choice between them is done using a
 377     // system option
 378     if ( wxSystemOptions::GetOptionInt(_T("msw.display.directdraw")) )
 379     {
 380         wxDisplayFactoryDirectDraw *factoryDD = new wxDisplayFactoryDirectDraw;
 381         if ( factoryDD->IsOk() )
 382             return factoryDD;
 383
 384         delete factoryDD;
 385     }
 386
 387     wxDisplayFactoryMultimon *factoryMM = new wxDisplayFactoryMultimon;
 388     if ( factoryMM->IsOk() )
 389         return factoryMM;
 390
 391     delete factoryMM;
 392
 393
 394     // finally fall back to a stub implementation if all else failed (Win95?)
 395     return new wxDisplayFactorySingle;
 396 }
 397
 398 // ----------------------------------------------------------------------------
 399 // wxDisplayInfo
 400 // ----------------------------------------------------------------------------
 401
 402 void wxDisplayInfo::Initialize()
 403 {
 404     if ( m_flags == (DWORD)-1 )
 405     {
 406         WinStruct<MONITORINFOEX> monInfo;
 407         if ( !gs_GetMonitorInfo(m_hmon, (LPMONITORINFO)&monInfo) )
 408         {
 409             wxLogLastError(_T("GetMonitorInfo"));
 410             m_flags = 0;
 411             return;
 412         }
 413
 414         wxCopyRECTToRect(monInfo.rcMonitor, m_rect);
 415         m_devName = monInfo.szDevice;
 416         m_flags = monInfo.dwFlags;
 417     }
 418 }
 419
 420 // ----------------------------------------------------------------------------
 421 // wxDisplayImplWin32Base
 422 // ----------------------------------------------------------------------------
 423
 424 wxRect wxDisplayImplWin32Base::GetGeometry() const
 425 {
 426     if ( m_info.m_rect.IsEmpty() )
 427         m_info.Initialize();
 428
 429     return m_info.m_rect;
 430 }
 431
 432 wxString wxDisplayImplWin32Base::GetName() const
 433 {
 434     if ( m_info.m_devName.IsEmpty() )
 435         m_info.Initialize();
 436
 437     return m_info.m_devName;
 438 }
 439
 440 bool wxDisplayImplWin32Base::IsPrimary() const
 441 {
 442     if ( m_info.m_flags == (DWORD)-1 )
 443         m_info.Initialize();
 444
 445     return (m_info.m_flags & MONITORINFOF_PRIMARY) != 0;
 446 }
 447
 448 wxVideoMode wxDisplayImplWin32Base::GetCurrentMode() const
 449 {
 450     wxVideoMode mode;
 451
 452     // The first parameter of EnumDisplaySettings() must be NULL under Win95
 453     // according to MSDN.  The version of GetName() we implement for Win95
 454     // returns an empty string.
 455     const wxString name = GetName();
 456     const wxChar * const deviceName = name.empty() ? NULL : name.c_str();
 457
 458     DEVMODE dm;
 459     dm.dmSize = sizeof(dm);
 460     dm.dmDriverExtra = 0;
 461     if ( !::EnumDisplaySettings(deviceName, ENUM_CURRENT_SETTINGS, &dm) )
 462     {
 463         wxLogLastError(_T("EnumDisplaySettings(ENUM_CURRENT_SETTINGS)"));
 464     }
 465     else
 466     {
 467         mode = ConvertToVideoMode(dm);
 468     }
 469
 470     return mode;
 471 }
 472
 473 // ----------------------------------------------------------------------------
 474 // wxDisplayFactoryWin32Base
 475 // ----------------------------------------------------------------------------
 476
 477 int wxDisplayFactoryWin32Base::ms_supportsMultimon = -1;
 478
 479 wxDisplayFactoryWin32Base::wxDisplayFactoryWin32Base()
 480 {
 481     if ( ms_supportsMultimon == -1 )
 482     {
 483         ms_supportsMultimon = 0;
 484
 485         wxDynamicLibrary dllUser32(_T("user32.dll"));
 486
 487         wxLogNull noLog;
 488
 489         gs_MonitorFromPoint = (MonitorFromPoint_t)
 490             dllUser32.GetSymbol(wxT("MonitorFromPoint"));
 491         if ( !gs_MonitorFromPoint )
 492             return;
 493
 494         gs_MonitorFromWindow = (MonitorFromWindow_t)
 495             dllUser32.GetSymbol(wxT("MonitorFromWindow"));
 496         if ( !gs_MonitorFromWindow )
 497             return;
 498
 499         gs_GetMonitorInfo = (GetMonitorInfo_t)
 500             dllUser32.GetSymbolAorW(wxT("GetMonitorInfo"));
 501         if ( !gs_GetMonitorInfo )
 502             return;
 503
 504         ms_supportsMultimon = 1;
 505
 506         // we can safely let dllUser32 go out of scope, the DLL itself will
 507         // still remain loaded as all Win32 programs use it
 508     }
 509 }
 510
 511 void wxDisplayFactoryWin32Base::Clear()
 512 {
 513     WX_CLEAR_ARRAY(m_displays);
 514 }
 515
 516 wxDisplayFactoryWin32Base::~wxDisplayFactoryWin32Base()
 517 {
 518     Clear();
 519 }
 520
 521 // helper for GetFromPoint() and GetFromWindow()
 522 int wxDisplayFactoryWin32Base::FindDisplayFromHMONITOR(HMONITOR hmon) const
 523 {
 524     if ( hmon )
 525     {
 526         const size_t count = m_displays.size();
 527         for ( size_t n = 0; n < count; n++ )
 528         {
 529             if ( hmon == m_displays[n]->m_hmon )
 530                 return n;
 531         }
 532     }
 533
 534     return wxNOT_FOUND;
 535 }
 536
 537 int wxDisplayFactoryWin32Base::GetFromPoint(const wxPoint& pt)
 538 {
 539     POINT pt2;
 540     pt2.x = pt.x;
 541     pt2.y = pt.y;
 542
 543     return FindDisplayFromHMONITOR(gs_MonitorFromPoint(pt2,
 544                                                        MONITOR_DEFAULTTONULL));
 545 }
 546
 547 int wxDisplayFactoryWin32Base::GetFromWindow(wxWindow *window)
 548 {
 549     return FindDisplayFromHMONITOR(gs_MonitorFromWindow(GetHwndOf(window),
 550                                                         MONITOR_DEFAULTTONULL));
 551 }
 552
 553 // ============================================================================
 554 // wxDisplay implementation using Win32 multimon API
 555 // ============================================================================
 556
 557 // ----------------------------------------------------------------------------
 558 // wxDisplayFactoryMultimon initialization
 559 // ----------------------------------------------------------------------------
 560
 561 wxDisplayFactoryMultimon::wxDisplayFactoryMultimon()
 562 {
 563     if ( !ms_supportsMultimon )
 564         return;
 565
 566     // look up EnumDisplayMonitors() which we don't need with DirectDraw
 567     // implementation
 568     EnumDisplayMonitors_t pfnEnumDisplayMonitors;
 569     {
 570         wxLogNull noLog;
 571
 572         wxDynamicLibrary dllUser32(_T("user32.dll"));
 573         pfnEnumDisplayMonitors = (EnumDisplayMonitors_t)
 574             dllUser32.GetSymbol(wxT("EnumDisplayMonitors"));
 575         if ( !pfnEnumDisplayMonitors )
 576             return;
 577     }
 578
 579     // enumerate all displays
 580     if ( !pfnEnumDisplayMonitors(NULL, NULL, MultimonEnumProc, (LPARAM)this) )
 581     {
 582         wxLogLastError(wxT("EnumDisplayMonitors"));
 583     }
 584 }
 585
 586 /* static */
 587 BOOL CALLBACK
 588 wxDisplayFactoryMultimon::MultimonEnumProc(
 589   HMONITOR hMonitor,        // handle to display monitor
 590   HDC WXUNUSED(hdcMonitor), // handle to monitor-appropriate device context
 591   LPRECT lprcMonitor,       // pointer to monitor intersection rectangle
 592   LPARAM dwData             // data passed from EnumDisplayMonitors (this)
 593 )
 594 {
 595     wxDisplayFactoryMultimon *const self = (wxDisplayFactoryMultimon *)dwData;
 596     self->AddDisplay(hMonitor, lprcMonitor);
 597
 598     // continue the enumeration
 599     return TRUE;
 600 }
 601
 602 // ----------------------------------------------------------------------------
 603 // wxDisplayFactoryMultimon helper functions
 604 // ----------------------------------------------------------------------------
 605
 606 void wxDisplayFactoryMultimon::AddDisplay(HMONITOR hMonitor, LPRECT lprcMonitor)
 607 {
 608     wxDisplayInfo *info = new wxDisplayInfo(hMonitor);
 609
 610     // we also store the display geometry
 611     info->m_rect = wxRect(lprcMonitor->left, lprcMonitor->top,
 612                           lprcMonitor->right - lprcMonitor->left,
 613                           lprcMonitor->bottom - lprcMonitor->top);
 614
 615     // now add this monitor to the array
 616     m_displays.Add(info);
 617 }
 618
 619 // ----------------------------------------------------------------------------
 620 // wxDisplayFactoryMultimon inherited pure virtuals implementation
 621 // ----------------------------------------------------------------------------
 622
 623 wxDisplayImpl *wxDisplayFactoryMultimon::CreateDisplay(size_t n)
 624 {
 625     wxCHECK_MSG( n < m_displays.size(), NULL, _T("invalid display index") );
 626
 627     return new wxDisplayImplMultimon(n, *(m_displays[n]));
 628 }
 629
 630 // ----------------------------------------------------------------------------
 631 // wxDisplayImplMultimon implementation
 632 // ----------------------------------------------------------------------------
 633
 634 wxArrayVideoModes
 635 wxDisplayImplMultimon::GetModes(const wxVideoMode& modeMatch) const
 636 {
 637     wxArrayVideoModes modes;
 638
 639     // The first parameter of EnumDisplaySettings() must be NULL under Win95
 640     // according to MSDN.  The version of GetName() we implement for Win95
 641     // returns an empty string.
 642     const wxString name = GetName();
 643     const wxChar * const deviceName = name.empty() ? NULL : name.c_str();
 644
 645     DEVMODE dm;
 646     dm.dmSize = sizeof(dm);
 647     dm.dmDriverExtra = 0;
 648     for ( int iModeNum = 0;
 649           ::EnumDisplaySettings(deviceName, iModeNum, &dm);
 650           iModeNum++ )
 651     {
 652         const wxVideoMode mode = ConvertToVideoMode(dm);
 653         if ( mode.Matches(modeMatch) )
 654         {
 655             modes.Add(mode);
 656         }
 657     }
 658
 659     return modes;
 660 }
 661
 662 bool wxDisplayImplMultimon::ChangeMode(const wxVideoMode& mode)
 663 {
 664     // prepare ChangeDisplaySettingsEx() parameters
 665     DEVMODE dm;
 666     DEVMODE *pDevMode;
 667
 668     int flags;
 669
 670     if ( mode == wxDefaultVideoMode )
 671     {
 672         // reset the video mode to default
 673         pDevMode = NULL;
 674         flags = 0;
 675     }
 676     else // change to the given mode
 677     {
 678         wxCHECK_MSG( mode.w && mode.h, false,
 679                         _T("at least the width and height must be specified") );
 680
 681         wxZeroMemory(dm);
 682         dm.dmSize = sizeof(dm);
 683         dm.dmDriverExtra = 0;
 684         dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
 685         dm.dmPelsWidth = mode.w;
 686         dm.dmPelsHeight = mode.h;
 687
 688         if ( mode.bpp )
 689         {
 690             dm.dmFields |= DM_BITSPERPEL;
 691             dm.dmBitsPerPel = mode.bpp;
 692         }
 693
 694         if ( mode.refresh )
 695         {
 696             dm.dmFields |= DM_DISPLAYFREQUENCY;
 697             dm.dmDisplayFrequency = mode.refresh;
 698         }
 699
 700         pDevMode = &dm;
 701
 702 #ifdef __WXWINCE__
 703         flags = 0;
 704 #else // !__WXWINCE__
 705         flags = CDS_FULLSCREEN;
 706 #endif // __WXWINCE__/!__WXWINCE__
 707     }
 708
 709
 710     // get pointer to the function dynamically
 711     //
 712     // we're only called from the main thread, so it's ok to use static
 713     // variable
 714     static ChangeDisplaySettingsEx_t pfnChangeDisplaySettingsEx = NULL;
 715     if ( !pfnChangeDisplaySettingsEx )
 716     {
 717         wxDynamicLibrary dllUser32(_T("user32.dll"));
 718         if ( dllUser32.IsLoaded() )
 719         {
 720             pfnChangeDisplaySettingsEx = (ChangeDisplaySettingsEx_t)
 721                 dllUser32.GetSymbolAorW(_T("ChangeDisplaySettingsEx"));
 722         }
 723         //else: huh, no user32.dll??
 724
 725 #ifndef __WXWINCE__
 726         if ( !pfnChangeDisplaySettingsEx )
 727         {
 728             // we must be under Win95 and so there is no multiple monitors
 729             // support anyhow
 730             pfnChangeDisplaySettingsEx = ChangeDisplaySettingsExForWin95;
 731         }
 732 #endif // !__WXWINCE__
 733     }
 734
 735     // do change the mode
 736     switch ( pfnChangeDisplaySettingsEx
 737              (
 738                 GetName(),      // display name
 739                 pDevMode,       // dev mode or NULL to reset
 740                 NULL,           // reserved
 741                 flags,
 742                 NULL            // pointer to video parameters (not used)
 743              ) )
 744     {
 745         case DISP_CHANGE_SUCCESSFUL:
 746             // ok
 747             {
 748                 // If we have a top-level, full-screen frame, emulate
 749                 // the DirectX behavior and resize it.  This makes this
 750                 // API quite a bit easier to use.
 751                 wxWindow *winTop = wxTheApp->GetTopWindow();
 752                 wxFrame *frameTop = wxDynamicCast(winTop, wxFrame);
 753                 if (frameTop && frameTop->IsFullScreen())
 754                 {
 755                     wxVideoMode current = GetCurrentMode();
 756                     frameTop->SetClientSize(current.w, current.h);
 757                 }
 758             }
 759             return true;
 760
 761         case DISP_CHANGE_BADMODE:
 762             // don't complain about this, this is the only "expected" error
 763             break;
 764
 765         default:
 766             wxFAIL_MSG( _T("unexpected ChangeDisplaySettingsEx() return value") );
 767     }
 768
 769     return false;
 770 }
 771
 772
 773 // ============================================================================
 774 // DirectDraw-based wxDisplay implementation
 775 // ============================================================================
 776
 777 #if wxUSE_DIRECTDRAW
 778
 779 // ----------------------------------------------------------------------------
 780 // wxDisplayFactoryDirectDraw initialization
 781 // ----------------------------------------------------------------------------
 782
 783 wxDisplayFactoryDirectDraw::wxDisplayFactoryDirectDraw()
 784 {
 785     if ( !ms_supportsMultimon )
 786         return;
 787
 788 #if wxUSE_LOG
 789     // suppress the errors if ddraw.dll is not found, we're prepared to handle
 790     // this
 791     wxLogNull noLog;
 792 #endif
 793
 794     m_dllDDraw.Load(_T("ddraw.dll"));
 795
 796     if ( !m_dllDDraw.IsLoaded() )
 797         return;
 798
 799     DirectDrawEnumerateEx_t pDDEnumEx = (DirectDrawEnumerateEx_t)
 800         m_dllDDraw.GetSymbolAorW(_T("DirectDrawEnumerateEx"));
 801     if ( !pDDEnumEx )
 802         return;
 803
 804     // we can't continue without DirectDrawCreate() later, so resolve it right
 805     // now and fail the initialization if it's not available
 806     m_pfnDirectDrawCreate = (DirectDrawCreate_t)
 807         m_dllDDraw.GetSymbol(_T("DirectDrawCreate"));
 808     if ( !m_pfnDirectDrawCreate )
 809         return;
 810
 811     if ( (*pDDEnumEx)(DDEnumExCallback,
 812                       this,
 813                       DDENUM_ATTACHEDSECONDARYDEVICES) != DD_OK )
 814     {
 815         wxLogLastError(_T("DirectDrawEnumerateEx"));
 816     }
 817 }
 818
 819 wxDisplayFactoryDirectDraw::~wxDisplayFactoryDirectDraw()
 820 {
 821     // we must clear m_displays now, before m_dllDDraw is unloaded as otherwise
 822     // calling m_pDD2->Release() later would crash
 823     Clear();
 824 }
 825
 826 // ----------------------------------------------------------------------------
 827 // callbacks for monitor/modes enumeration stuff
 828 // ----------------------------------------------------------------------------
 829
 830 BOOL WINAPI
 831 wxDisplayFactoryDirectDraw::DDEnumExCallback(GUID *pGuid,
 832                                              LPTSTR WXUNUSED(driverDescription),
 833                                              LPTSTR driverName,
 834                                              LPVOID lpContext,
 835                                              HMONITOR hmon)
 836 {
 837     if ( pGuid )
 838     {
 839         wxDisplayFactoryDirectDraw * self =
 840             wx_static_cast(wxDisplayFactoryDirectDraw *, lpContext);
 841         self->AddDisplay(*pGuid, hmon, driverName);
 842     }
 843     //else: we're called for the primary monitor, skip it
 844
 845     // continue the enumeration
 846     return TRUE;
 847 }
 848
 849 // ----------------------------------------------------------------------------
 850 // wxDisplayFactoryDirectDraw helpers
 851 // ----------------------------------------------------------------------------
 852
 853 void wxDisplayFactoryDirectDraw::AddDisplay(const GUID& guid,
 854                                             HMONITOR hmon,
 855                                             LPTSTR name)
 856 {
 857     m_displays.Add(new wxDisplayInfoDirectDraw(guid, hmon, name));
 858 }
 859
 860 // ----------------------------------------------------------------------------
 861 // wxDisplayFactoryDirectDraw inherited pure virtuals implementation
 862 // ----------------------------------------------------------------------------
 863
 864 wxDisplayImpl *wxDisplayFactoryDirectDraw::CreateDisplay(size_t n)
 865 {
 866     wxCHECK_MSG( n < m_displays.size(), NULL, _T("invalid display index") );
 867
 868     wxDisplayInfoDirectDraw *
 869         info = wx_static_cast(wxDisplayInfoDirectDraw *, m_displays[n]);
 870
 871     if ( !info->m_pDD2 )
 872     {
 873         IDirectDraw *pDD;
 874         GUID guid(info->m_guid);
 875         HRESULT hr = (*m_pfnDirectDrawCreate)(&guid, &pDD, NULL);
 876
 877         if ( FAILED(hr) || !pDD )
 878         {
 879             // what to do??
 880             wxLogApiError(_T("DirectDrawCreate"), hr);
 881             return NULL;
 882         }
 883
 884         // we got IDirectDraw, but we need IDirectDraw2
 885         hr = pDD->QueryInterface(wxIID_IDirectDraw2, (void **)&info->m_pDD2);
 886         pDD->Release();
 887
 888         if ( FAILED(hr) || !info->m_pDD2 )
 889         {
 890             wxLogApiError(_T("IDirectDraw::QueryInterface(IDD2)"), hr);
 891             return NULL;
 892         }
 893
 894         // NB: m_pDD2 will now be only destroyed when m_displays is destroyed
 895         //     which is ok as we don't want to recreate DD objects all the time
 896     }
 897     //else: DirectDraw object corresponding to our display already exists
 898
 899     return new wxDisplayImplDirectDraw(n, *info, info->m_pDD2);
 900 }
 901
 902 // ============================================================================
 903 // wxDisplayImplDirectDraw
 904 // ============================================================================
 905
 906 // ----------------------------------------------------------------------------
 907 // video modes enumeration
 908 // ----------------------------------------------------------------------------
 909
 910 // tiny helper class used to pass information from GetModes() to
 911 // wxDDEnumModesCallback
 912 class wxDDVideoModesAdder
 913 {
 914 public:
 915     // our Add() method will add modes matching modeMatch to modes array
 916     wxDDVideoModesAdder(wxArrayVideoModes& modes, const wxVideoMode& modeMatch)
 917         : m_modes(modes),
 918           m_modeMatch(modeMatch)
 919     {
 920     }
 921
 922     void Add(const wxVideoMode& mode)
 923     {
 924         if ( mode.Matches(m_modeMatch) )
 925             m_modes.Add(mode);
 926     }
 927
 928 private:
 929     wxArrayVideoModes& m_modes;
 930     const wxVideoMode& m_modeMatch;
 931
 932     DECLARE_NO_COPY_CLASS(wxDDVideoModesAdder)
 933 };
 934
 935 HRESULT WINAPI wxDDEnumModesCallback(LPDDSURFACEDESC lpDDSurfaceDesc,
 936                                      LPVOID lpContext)
 937 {
 938     // we need at least the mode size
 939     static const DWORD FLAGS_REQUIRED = DDSD_HEIGHT | DDSD_WIDTH;
 940     if ( (lpDDSurfaceDesc->dwFlags & FLAGS_REQUIRED) == FLAGS_REQUIRED )
 941     {
 942         wxDDVideoModesAdder * const vmodes =
 943             wx_static_cast(wxDDVideoModesAdder *, lpContext);
 944
 945         vmodes->Add(wxVideoMode(lpDDSurfaceDesc->dwWidth,
 946                                 lpDDSurfaceDesc->dwHeight,
 947                                 lpDDSurfaceDesc->ddpfPixelFormat.dwRGBBitCount,
 948                                 lpDDSurfaceDesc->dwRefreshRate));
 949     }
 950
 951     // continue the enumeration
 952     return DDENUMRET_OK;
 953 }
 954
 955 wxArrayVideoModes
 956 wxDisplayImplDirectDraw::GetModes(const wxVideoMode& modeMatch) const
 957 {
 958     wxArrayVideoModes modes;
 959     wxDDVideoModesAdder modesAdder(modes, modeMatch);
 960
 961     HRESULT hr = m_pDD2->EnumDisplayModes
 962                          (
 963                             DDEDM_REFRESHRATES,
 964                             NULL,                   // all modes
 965                             &modesAdder,            // callback parameter
 966                             wxDDEnumModesCallback
 967                          );
 968
 969     if ( FAILED(hr) )
 970     {
 971         wxLogApiError(_T("IDirectDraw::EnumDisplayModes"), hr);
 972     }
 973
 974     return modes;
 975 }
 976
 977 // ----------------------------------------------------------------------------
 978 // video mode switching
 979 // ----------------------------------------------------------------------------
 980
 981 bool wxDisplayImplDirectDraw::ChangeMode(const wxVideoMode& mode)
 982 {
 983     wxWindow *winTop = wxTheApp->GetTopWindow();
 984     wxCHECK_MSG( winTop, false, _T("top level window required for DirectX") );
 985
 986     HRESULT hr = m_pDD2->SetCooperativeLevel
 987                          (
 988                             GetHwndOf(winTop),
 989                             DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN
 990                          );
 991     if ( FAILED(hr) )
 992     {
 993         wxLogApiError(_T("IDirectDraw2::SetCooperativeLevel"), hr);
 994
 995         return false;
 996     }
 997
 998     hr = m_pDD2->SetDisplayMode(mode.w, mode.h, mode.bpp, mode.refresh, 0);
 999     if ( FAILED(hr) )
1000     {
1001         wxLogApiError(_T("IDirectDraw2::SetDisplayMode"), hr);
1002
1003         return false;
1004     }
1005
1006     return true;
1007 }
1008
1009 #endif // wxUSE_DIRECTDRAW
1010
1011 #endif // wxUSE_DISPLAY