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multimon.h

/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
#ifdef __cplusplus
extern "C" {
#endif

#ifndef SM_CMONITORS
#define SM_XVIRTUALSCREEN 76
#define SM_YVIRTUALSCREEN 77
#define SM_CXVIRTUALSCREEN 78
#define SM_CYVIRTUALSCREEN 79
#define SM_CMONITORS 80
#define SM_SAMEDISPLAYFORMAT 81

#define MONITOR_DEFAULTTONULL 0x00000000
#define MONITOR_DEFAULTTOPRIMARY 0x00000001
#define MONITOR_DEFAULTTONEAREST 0x00000002

#define MONITORINFOF_PRIMARY 0x00000001

  typedef struct tagMONITORINFO {
    DWORD cbSize;
    RECT rcMonitor;
    RECT rcWork;
    DWORD dwFlags;
  } MONITORINFO,*LPMONITORINFO;

#ifndef CCHDEVICENAME
#define CCHDEVICENAME 32
#endif

#ifdef __cplusplus
  typedef struct tagMONITORINFOEXA : public tagMONITORINFO {
    CHAR szDevice[CCHDEVICENAME];
  } MONITORINFOEXA,*LPMONITORINFOEXA;

  typedef struct tagMONITORINFOEXW : public tagMONITORINFO {
    WCHAR szDevice[CCHDEVICENAME];
  } MONITORINFOEXW,*LPMONITORINFOEXW;
#ifdef UNICODE
  typedef MONITORINFOEXW MONITORINFOEX;
  typedef LPMONITORINFOEXW LPMONITORINFOEX;
#else
  typedef MONITORINFOEXA MONITORINFOEX;
  typedef LPMONITORINFOEXA LPMONITORINFOEX;
#endif
#else
  typedef struct tagMONITORINFOEXA {
    MONITORINFO;
    CHAR szDevice[CCHDEVICENAME];
  } MONITORINFOEXA,*LPMONITORINFOEXA;

  typedef struct tagMONITORINFOEXW {
    MONITORINFO;
    WCHAR szDevice[CCHDEVICENAME];
  } MONITORINFOEXW,*LPMONITORINFOEXW;
#ifdef UNICODE
  typedef MONITORINFOEXW MONITORINFOEX;
  typedef LPMONITORINFOEXW LPMONITORINFOEX;
#else
  typedef MONITORINFOEXA MONITORINFOEX;
  typedef LPMONITORINFOEXA LPMONITORINFOEX;
#endif
#endif

  typedef WINBOOL (CALLBACK *MONITORENUMPROC)(HMONITOR,HDC,LPRECT,LPARAM);

#ifndef DISPLAY_DEVICE_ATTACHED_TO_DESKTOP
  typedef struct _DISPLAY_DEVICEA {
    DWORD cb;
    CHAR DeviceName[32];
    CHAR DeviceString[128];
    DWORD StateFlags;
    CHAR DeviceID[128];
    CHAR DeviceKey[128];
  } DISPLAY_DEVICEA,*PDISPLAY_DEVICEA,*LPDISPLAY_DEVICEA;

  typedef struct _DISPLAY_DEVICEW {
    DWORD cb;
    WCHAR DeviceName[32];
    WCHAR DeviceString[128];
    DWORD StateFlags;
    WCHAR DeviceID[128];
    WCHAR DeviceKey[128];
  } DISPLAY_DEVICEW,*PDISPLAY_DEVICEW,*LPDISPLAY_DEVICEW;
#ifdef UNICODE
  typedef DISPLAY_DEVICEW DISPLAY_DEVICE;
  typedef PDISPLAY_DEVICEW PDISPLAY_DEVICE;
  typedef LPDISPLAY_DEVICEW LPDISPLAY_DEVICE;
#else
  typedef DISPLAY_DEVICEA DISPLAY_DEVICE;
  typedef PDISPLAY_DEVICEA PDISPLAY_DEVICE;
  typedef LPDISPLAY_DEVICEA LPDISPLAY_DEVICE;
#endif

#define DISPLAY_DEVICE_ATTACHED_TO_DESKTOP 0x00000001
#define DISPLAY_DEVICE_MULTI_DRIVER 0x00000002
#define DISPLAY_DEVICE_PRIMARY_DEVICE 0x00000004
#define DISPLAY_DEVICE_MIRRORING_DRIVER 0x00000008
#define DISPLAY_DEVICE_VGA_COMPATIBLE 0x00000010
#endif
#endif

#undef GetMonitorInfo
#undef GetSystemMetrics
#undef MonitorFromWindow
#undef MonitorFromRect
#undef MonitorFromPoint
#undef EnumDisplayMonitors
#undef EnumDisplayDevices

#ifdef COMPILE_MULTIMON_STUBS

#ifndef MULTIMON_FNS_DEFINED
  int (WINAPI *g_pfnGetSystemMetrics)(int) = NULL;
  HMONITOR (WINAPI *g_pfnMonitorFromWindow)(HWND,DWORD) = NULL;
  HMONITOR (WINAPI *g_pfnMonitorFromRect)(LPCRECT,DWORD) = NULL;
  HMONITOR (WINAPI *g_pfnMonitorFromPoint)(POINT,DWORD) = NULL;
  WINBOOL (WINAPI *g_pfnGetMonitorInfo)(HMONITOR,LPMONITORINFO) = NULL;
  WINBOOL (WINAPI *g_pfnEnumDisplayMonitors)(HDC,LPCRECT,MONITORENUMPROC,LPARAM) = NULL;
  WINBOOL (WINAPI *g_pfnEnumDisplayDevices)(PVOID,DWORD,PDISPLAY_DEVICE,DWORD) = NULL;
  WINBOOL g_fMultiMonInitDone = FALSE;
  WINBOOL g_fMultimonPlatformNT = FALSE;
#endif

  WINBOOL IsPlatformNT() {
    OSVERSIONINFOA osvi = {0};
    osvi.dwOSVersionInfoSize = sizeof(osvi);
    GetVersionExA((OSVERSIONINFOA*)&osvi);
    return (VER_PLATFORM_WIN32_NT==osvi.dwPlatformId);
  }

  WINBOOL InitMultipleMonitorStubs(void) {
    HMODULE hUser32;
    if(g_fMultiMonInitDone) return g_pfnGetMonitorInfo!=NULL;
    g_fMultimonPlatformNT = IsPlatformNT();
    hUser32 = GetModuleHandle(TEXT("USER32"));
    if(hUser32 &&
      (*(FARPROC*)&g_pfnGetSystemMetrics = GetProcAddress(hUser32,"GetSystemMetrics"))!=NULL &&
      (*(FARPROC*)&g_pfnMonitorFromWindow = GetProcAddress(hUser32,"MonitorFromWindow"))!=NULL &&
      (*(FARPROC*)&g_pfnMonitorFromRect = GetProcAddress(hUser32,"MonitorFromRect"))!=NULL &&
      (*(FARPROC*)&g_pfnMonitorFromPoint = GetProcAddress(hUser32,"MonitorFromPoint"))!=NULL &&
      (*(FARPROC*)&g_pfnEnumDisplayMonitors = GetProcAddress(hUser32,"EnumDisplayMonitors"))!=NULL &&
#ifdef UNICODE
      (*(FARPROC*)&g_pfnEnumDisplayDevices = GetProcAddress(hUser32,"EnumDisplayDevicesW"))!=NULL &&
      (*(FARPROC*)&g_pfnGetMonitorInfo = g_fMultimonPlatformNT ? GetProcAddress(hUser32,"GetMonitorInfoW") :
      GetProcAddress(hUser32,"GetMonitorInfoA"))!=NULL
#else
      (*(FARPROC*)&g_pfnGetMonitorInfo = GetProcAddress(hUser32,"GetMonitorInfoA"))!=NULL &&
      (*(FARPROC*)&g_pfnEnumDisplayDevices = GetProcAddress(hUser32,"EnumDisplayDevicesA"))!=NULL
#endif
      ) {
      g_fMultiMonInitDone = TRUE;
      return TRUE;
    } else {
      g_pfnGetSystemMetrics = NULL;
      g_pfnMonitorFromWindow = NULL;
      g_pfnMonitorFromRect = NULL;
      g_pfnMonitorFromPoint = NULL;
      g_pfnGetMonitorInfo = NULL;
      g_pfnEnumDisplayMonitors = NULL;
      g_pfnEnumDisplayDevices = NULL;
      g_fMultiMonInitDone = TRUE;
      return FALSE;
    }
  }

  int WINAPI xGetSystemMetrics(int nIndex) {
    if(InitMultipleMonitorStubs()) return g_pfnGetSystemMetrics(nIndex);
    switch(nIndex) {
      case SM_CMONITORS:
      case SM_SAMEDISPLAYFORMAT:
        return 1;
      case SM_XVIRTUALSCREEN:
      case SM_YVIRTUALSCREEN:
        return 0;
      case SM_CXVIRTUALSCREEN:
        nIndex = SM_CXSCREEN;
        break;
      case SM_CYVIRTUALSCREEN:
        nIndex = SM_CYSCREEN;
        break;
    }
    return GetSystemMetrics(nIndex);
  }

#define xPRIMARY_MONITOR ((HMONITOR)0x12340042)

  HMONITOR WINAPI xMonitorFromPoint(POINT ptScreenCoords,DWORD dwFlags) {
    if(InitMultipleMonitorStubs()) return g_pfnMonitorFromPoint(ptScreenCoords,dwFlags);
    if((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
      ((ptScreenCoords.x >= 0) &&
      (ptScreenCoords.x < GetSystemMetrics(SM_CXSCREEN)) &&
      (ptScreenCoords.y >= 0) &&
      (ptScreenCoords.y < GetSystemMetrics(SM_CYSCREEN))))
    {
      return xPRIMARY_MONITOR;
    }
    return NULL;
  }

  HMONITOR WINAPI xMonitorFromRect(LPCRECT lprcScreenCoords,DWORD dwFlags)
  {
    if(InitMultipleMonitorStubs()) return g_pfnMonitorFromRect(lprcScreenCoords,dwFlags);
    if((dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
      ((lprcScreenCoords->right > 0) &&
      (lprcScreenCoords->bottom > 0) &&
      (lprcScreenCoords->left < GetSystemMetrics(SM_CXSCREEN)) &&
      (lprcScreenCoords->top < GetSystemMetrics(SM_CYSCREEN))))
    {
      return xPRIMARY_MONITOR;
    }
    return NULL;
  }

  HMONITOR WINAPI xMonitorFromWindow(HWND hWnd,DWORD dwFlags) {
    WINDOWPLACEMENT wp;
    if(InitMultipleMonitorStubs()) return g_pfnMonitorFromWindow(hWnd,dwFlags);
    if(dwFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) return xPRIMARY_MONITOR;
    if(IsIconic(hWnd) ? GetWindowPlacement(hWnd,&wp) : GetWindowRect(hWnd,&wp.rcNormalPosition)) return xMonitorFromRect(&wp.rcNormalPosition,dwFlags);
    return NULL;
  }

  WINBOOL WINAPI xGetMonitorInfo(HMONITOR hMonitor,LPMONITORINFO lpMonitorInfo) {
    RECT rcWork;
    if(InitMultipleMonitorStubs()) {
      WINBOOL f = g_pfnGetMonitorInfo(hMonitor,lpMonitorInfo);
#ifdef UNICODE
      if(f && !g_fMultimonPlatformNT && (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX))) {
      MultiByteToWideChar(CP_ACP,0,(LPSTR)((MONITORINFOEX*)lpMonitorInfo)->szDevice,-1,((MONITORINFOEX*)lpMonitorInfo)->szDevice,(sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
      }
#endif
      return f;
    }
    if((hMonitor==xPRIMARY_MONITOR) &&
      lpMonitorInfo &&
      (lpMonitorInfo->cbSize >= sizeof(MONITORINFO)) &&
      SystemParametersInfoA(SPI_GETWORKAREA,0,&rcWork,0))
    {
      lpMonitorInfo->rcMonitor.left = 0;
      lpMonitorInfo->rcMonitor.top = 0;
      lpMonitorInfo->rcMonitor.right = GetSystemMetrics(SM_CXSCREEN);
      lpMonitorInfo->rcMonitor.bottom = GetSystemMetrics(SM_CYSCREEN);
      lpMonitorInfo->rcWork = rcWork;
      lpMonitorInfo->dwFlags = MONITORINFOF_PRIMARY;
      if(lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX)) {
#ifdef UNICODE
      MultiByteToWideChar(CP_ACP,0,"DISPLAY",-1,((MONITORINFOEX*)lpMonitorInfo)->szDevice,(sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
#else
      lstrcpyn(((MONITORINFOEX*)lpMonitorInfo)->szDevice,TEXT("DISPLAY"),(sizeof(((MONITORINFOEX*)lpMonitorInfo)->szDevice)/sizeof(TCHAR)));
#endif
      }

      return TRUE;
    }

    return FALSE;
  }

  WINBOOL WINAPI
    xEnumDisplayMonitors(HDC hdcOptionalForPainting,LPCRECT lprcEnumMonitorsThatIntersect,MONITORENUMPROC lpfnEnumProc,LPARAM dwData)
  {
    RECT rcLimit;

    if(InitMultipleMonitorStubs()) {
      return g_pfnEnumDisplayMonitors(hdcOptionalForPainting,lprcEnumMonitorsThatIntersect,lpfnEnumProc,dwData);
    }

    if(!lpfnEnumProc)
      return FALSE;

    rcLimit.left = 0;
    rcLimit.top = 0;
    rcLimit.right = GetSystemMetrics(SM_CXSCREEN);
    rcLimit.bottom = GetSystemMetrics(SM_CYSCREEN);

    if(hdcOptionalForPainting)
    {
      RECT rcClip;
      POINT ptOrg;

      switch (GetClipBox(hdcOptionalForPainting,&rcClip))
      {
      default:
      if(!GetDCOrgEx(hdcOptionalForPainting,&ptOrg))
        return FALSE;

      OffsetRect(&rcLimit,-ptOrg.x,-ptOrg.y);
      if(IntersectRect(&rcLimit,&rcLimit,&rcClip) &&
        (!lprcEnumMonitorsThatIntersect ||
        IntersectRect(&rcLimit,&rcLimit,lprcEnumMonitorsThatIntersect))) {

          break;
      }

      case NULLREGION:
      return TRUE;
      case ERROR:
      return FALSE;
      }
    } else {
      if(lprcEnumMonitorsThatIntersect &&
      !IntersectRect(&rcLimit,&rcLimit,lprcEnumMonitorsThatIntersect)) {

        return TRUE;
      }
    }

    return lpfnEnumProc(xPRIMARY_MONITOR,hdcOptionalForPainting,&rcLimit,dwData);
  }

  WINBOOL WINAPI
    xEnumDisplayDevices(PVOID Unused,DWORD iDevNum,PDISPLAY_DEVICE lpDisplayDevice,DWORD dwFlags)
  {
    if(InitMultipleMonitorStubs())
      return g_pfnEnumDisplayDevices(Unused,iDevNum,lpDisplayDevice,dwFlags);

    if(Unused!=NULL)
      return FALSE;

    if(iDevNum!=0)
      return FALSE;

    if(!lpDisplayDevice || lpDisplayDevice->cb < sizeof(DISPLAY_DEVICE))
      return FALSE;

#ifdef UNICODE
    MultiByteToWideChar(CP_ACP,0,"DISPLAY",-1,lpDisplayDevice->DeviceName,(sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
    MultiByteToWideChar(CP_ACP,0,"DISPLAY",-1,lpDisplayDevice->DeviceString,(sizeof(lpDisplayDevice->DeviceString)/sizeof(TCHAR)));
#else
    lstrcpyn((LPTSTR)lpDisplayDevice->DeviceName,TEXT("DISPLAY"),(sizeof(lpDisplayDevice->DeviceName)/sizeof(TCHAR)));
    lstrcpyn((LPTSTR)lpDisplayDevice->DeviceString,TEXT("DISPLAY"),(sizeof(lpDisplayDevice->DeviceString)/sizeof(TCHAR)));
#endif
    lpDisplayDevice->StateFlags = DISPLAY_DEVICE_ATTACHED_TO_DESKTOP | DISPLAY_DEVICE_PRIMARY_DEVICE;
    return TRUE;
  }

#undef xPRIMARY_MONITOR
#undef COMPILE_MULTIMON_STUBS
#else

  extern int WINAPI xGetSystemMetrics(int);
  extern HMONITOR WINAPI xMonitorFromWindow(HWND,DWORD);
  extern HMONITOR WINAPI xMonitorFromRect(LPCRECT,DWORD);
  extern HMONITOR WINAPI xMonitorFromPoint(POINT,DWORD);
  extern WINBOOL WINAPI xGetMonitorInfo(HMONITOR,LPMONITORINFO);
  extern WINBOOL WINAPI xEnumDisplayMonitors(HDC,LPCRECT,MONITORENUMPROC,LPARAM);
  extern WINBOOL WINAPI xEnumDisplayDevices(PVOID,DWORD,PDISPLAY_DEVICE,DWORD);
#endif

#define GetSystemMetrics xGetSystemMetrics
#define MonitorFromWindow xMonitorFromWindow
#define MonitorFromRect xMonitorFromRect
#define MonitorFromPoint xMonitorFromPoint
#define GetMonitorInfo xGetMonitorInfo
#define EnumDisplayMonitors xEnumDisplayMonitors
#define EnumDisplayDevices xEnumDisplayDevices

#ifdef __cplusplus
}
#endif

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