xf_monitor.c

 
#include <freerdp/config.h>
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
 
#include <winpr/assert.h>
#include <winpr/cast.h>
#include <winpr/crt.h>
 
#include <freerdp/log.h>
 
#define TAG CLIENT_TAG("x11")
 
#ifdef WITH_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif
 
#ifdef WITH_XRANDR
#include <X11/extensions/Xrandr.h>
#include <X11/extensions/randr.h>
 
#if (RANDR_MAJOR * 100 + RANDR_MINOR) >= 105
#define USABLE_XRANDR
#endif
 
#endif
 
#include "xf_monitor.h"
 
/* See MSDN Section on Multiple Display Monitors: http://msdn.microsoft.com/en-us/library/dd145071
 */
 
int xf_list_monitors(xfContext* xfc)
{
  Display* display = NULL;
  int major = 0;
  int minor = 0;
  int nmonitors = 0;
  display = XOpenDisplay(NULL);
 
  if (!display)
  {
    WLog_ERR(TAG, "failed to open X display");
    return -1;
  }
 
#if defined(USABLE_XRANDR)
 
  if (XRRQueryExtension(display, &major, &minor) &&
      (XRRQueryVersion(display, &major, &minor) == True) && (major * 100 + minor >= 105))
  {
    XRRMonitorInfo* monitors =
        XRRGetMonitors(display, DefaultRootWindow(display), 1, &nmonitors);
 
    for (int i = 0; i < nmonitors; i++)
    {
      printf("      %s [%d] %dx%d\t+%d+%d\n", monitors[i].primary ? "*" : " ", i,
             monitors[i].width, monitors[i].height, monitors[i].x, monitors[i].y);
    }
 
    XRRFreeMonitors(monitors);
  }
  else
#endif
#ifdef WITH_XINERAMA
      if (XineramaQueryExtension(display, &major, &minor))
  {
    if (XineramaIsActive(display))
    {
      XineramaScreenInfo* screen = XineramaQueryScreens(display, &nmonitors);
 
      for (int i = 0; i < nmonitors; i++)
      {
        printf("      %s [%d] %hdx%hd\t+%hd+%hd\n", (i == 0) ? "*" : " ", i,
               screen[i].width, screen[i].height, screen[i].x_org, screen[i].y_org);
      }
 
      XFree(screen);
    }
  }
  else
#else
  {
    Screen* screen = ScreenOfDisplay(display, DefaultScreen(display));
    printf("      * [0] %dx%d\t+0+0\n", WidthOfScreen(screen), HeightOfScreen(screen));
  }
 
#endif
    XCloseDisplay(display);
  return 0;
}
 
static BOOL xf_is_monitor_id_active(xfContext* xfc, UINT32 id)
{
  const rdpSettings* settings = NULL;
 
  WINPR_ASSERT(xfc);
 
  settings = xfc->common.context.settings;
  WINPR_ASSERT(settings);
 
  const UINT32 NumMonitorIds = freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds);
  if (NumMonitorIds == 0)
    return TRUE;
 
  for (UINT32 index = 0; index < NumMonitorIds; index++)
  {
    const UINT32* cur = freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorIds, index);
    if (cur && (*cur == id))
      return TRUE;
  }
 
  return FALSE;
}
 
BOOL xf_detect_monitors(xfContext* xfc, UINT32* pMaxWidth, UINT32* pMaxHeight)
{
  BOOL rc = FALSE;
  UINT32 monitor_index = 0;
  BOOL primaryMonitorFound = FALSE;
  VIRTUAL_SCREEN* vscreen = NULL;
  rdpSettings* settings = NULL;
  int mouse_x = 0;
  int mouse_y = 0;
  int _dummy_i = 0;
  Window _dummy_w = 0;
  UINT32 current_monitor = 0;
  Screen* screen = NULL;
#if defined WITH_XINERAMA || defined WITH_XRANDR
  int major = 0;
  int minor = 0;
#endif
#if defined(USABLE_XRANDR)
  XRRMonitorInfo* rrmonitors = NULL;
  BOOL useXRandr = FALSE;
#endif
 
  if (!xfc || !pMaxWidth || !pMaxHeight || !xfc->common.context.settings)
    return FALSE;
 
  settings = xfc->common.context.settings;
  vscreen = &xfc->vscreen;
  *pMaxWidth = freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth);
  *pMaxHeight = freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight);
 
  if (freerdp_settings_get_uint64(settings, FreeRDP_ParentWindowId) > 0)
  {
    xfc->workArea.x = 0;
    xfc->workArea.y = 0;
    xfc->workArea.width = freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth);
    xfc->workArea.height = freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight);
    return TRUE;
  }
 
  /* get mouse location */
  if (!XQueryPointer(xfc->display, DefaultRootWindow(xfc->display), &_dummy_w, &_dummy_w,
                     &mouse_x, &mouse_y, &_dummy_i, &_dummy_i, (void*)&_dummy_i))
    mouse_x = mouse_y = 0;
 
#if defined(USABLE_XRANDR)
 
  if (XRRQueryExtension(xfc->display, &major, &minor) &&
      (XRRQueryVersion(xfc->display, &major, &minor) == True) && (major * 100 + minor >= 105))
  {
    int nmonitors = 0;
    rrmonitors = XRRGetMonitors(xfc->display, DefaultRootWindow(xfc->display), 1, &nmonitors);
 
    if ((nmonitors < 0) || (nmonitors > 16))
      vscreen->nmonitors = 0;
    else
      vscreen->nmonitors = (UINT32)nmonitors;
 
    if (vscreen->nmonitors)
    {
      for (UINT32 i = 0; i < vscreen->nmonitors; i++)
      {
        MONITOR_INFO* cur_vscreen = &vscreen->monitors[i];
        const XRRMonitorInfo* cur_monitor = &rrmonitors[i];
 
        cur_vscreen->area.left = WINPR_ASSERTING_INT_CAST(UINT16, cur_monitor->x);
        cur_vscreen->area.top = WINPR_ASSERTING_INT_CAST(UINT16, cur_monitor->y);
        cur_vscreen->area.right =
            WINPR_ASSERTING_INT_CAST(UINT16, cur_monitor->x + cur_monitor->width - 1);
        cur_vscreen->area.bottom =
            WINPR_ASSERTING_INT_CAST(UINT16, cur_monitor->y + cur_monitor->height - 1);
        cur_vscreen->primary = cur_monitor->primary > 0;
      }
    }
 
    useXRandr = TRUE;
  }
  else
#endif
#ifdef WITH_XINERAMA
      if (XineramaQueryExtension(xfc->display, &major, &minor) && XineramaIsActive(xfc->display))
  {
    int nmonitors = 0;
    XineramaScreenInfo* screenInfo = XineramaQueryScreens(xfc->display, &nmonitors);
 
    if ((nmonitors < 0) || (nmonitors > 16))
      vscreen->nmonitors = 0;
    else
      vscreen->nmonitors = (UINT32)nmonitors;
 
    if (vscreen->nmonitors)
    {
      for (UINT32 i = 0; i < vscreen->nmonitors; i++)
      {
        MONITOR_INFO* monitor = &vscreen->monitors[i];
        monitor->area.left = WINPR_ASSERTING_INT_CAST(uint16_t, screenInfo[i].x_org);
        monitor->area.top = WINPR_ASSERTING_INT_CAST(uint16_t, screenInfo[i].y_org);
        monitor->area.right = WINPR_ASSERTING_INT_CAST(
            uint16_t, screenInfo[i].x_org + screenInfo[i].width - 1);
        monitor->area.bottom = WINPR_ASSERTING_INT_CAST(
            uint16_t, screenInfo[i].y_org + screenInfo[i].height - 1);
      }
    }
 
    XFree(screenInfo);
  }
 
#endif
  xfc->fullscreenMonitors.top = xfc->fullscreenMonitors.bottom = xfc->fullscreenMonitors.left =
      xfc->fullscreenMonitors.right = 0;
 
  /* Determine which monitor that the mouse cursor is on */
  if (vscreen->monitors)
  {
    for (UINT32 i = 0; i < vscreen->nmonitors; i++)
    {
      const MONITOR_INFO* monitor = &vscreen->monitors[i];
 
      if ((mouse_x >= monitor->area.left) && (mouse_x <= monitor->area.right) &&
          (mouse_y >= monitor->area.top) && (mouse_y <= monitor->area.bottom))
      {
        current_monitor = i;
        break;
      }
    }
  }
 
  /*
     Even for a single monitor, we need to calculate the virtual screen to support
     window managers that do not implement all X window state hints.
 
     If the user did not request multiple monitor or is using workarea
     without remote app, we force the number of monitors be 1 so later
     the rest of the client don't end up using more monitors than the user desires.
   */
  if ((!freerdp_settings_get_bool(settings, FreeRDP_UseMultimon) &&
       !freerdp_settings_get_bool(settings, FreeRDP_SpanMonitors)) ||
      (freerdp_settings_get_bool(settings, FreeRDP_Workarea) &&
       !freerdp_settings_get_bool(settings, FreeRDP_RemoteApplicationMode)))
  {
    /* If no monitors were specified on the command-line then set the current monitor as active
     */
    if (freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds) == 0)
    {
      UINT32 id = current_monitor;
      if (!freerdp_settings_set_pointer_len(settings, FreeRDP_MonitorIds, &id, 1))
        goto fail;
    }
 
    /* Always sets number of monitors from command-line to just 1.
     * If the monitor is invalid then we will default back to current monitor
     * later as a fallback. So, there is no need to validate command-line entry here.
     */
    if (!freerdp_settings_set_uint32(settings, FreeRDP_NumMonitorIds, 1))
      goto fail;
  }
 
  /* WORKAROUND: With Remote Application Mode - using NET_WM_WORKAREA
   * causes issues with the ability to fully size the window vertically
   * (the bottom of the window area is never updated). So, we just set
   * the workArea to match the full Screen width/height.
   */
  if (freerdp_settings_get_bool(settings, FreeRDP_RemoteApplicationMode) || !xf_GetWorkArea(xfc))
  {
    /*
       if only 1 monitor is enabled, use monitor area
       this is required in case of a screen composed of more than one monitor
       but user did not enable multimonitor
    */
    if ((freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds) == 1) &&
        (vscreen->nmonitors > current_monitor))
    {
      MONITOR_INFO* monitor = vscreen->monitors + current_monitor;
 
      if (!monitor)
        goto fail;
 
      xfc->workArea.x = monitor->area.left;
      xfc->workArea.y = monitor->area.top;
      xfc->workArea.width = monitor->area.right - monitor->area.left + 1;
      xfc->workArea.height = monitor->area.bottom - monitor->area.top + 1;
    }
    else
    {
      xfc->workArea.x = 0;
      xfc->workArea.y = 0;
      xfc->workArea.width = WINPR_ASSERTING_INT_CAST(uint32_t, WidthOfScreen(xfc->screen));
      xfc->workArea.height = WINPR_ASSERTING_INT_CAST(uint32_t, HeightOfScreen(xfc->screen));
    }
  }
 
  if (freerdp_settings_get_bool(settings, FreeRDP_Fullscreen))
  {
    *pMaxWidth = WINPR_ASSERTING_INT_CAST(uint32_t, WidthOfScreen(xfc->screen));
    *pMaxHeight = WINPR_ASSERTING_INT_CAST(uint32_t, HeightOfScreen(xfc->screen));
  }
  else if (freerdp_settings_get_bool(settings, FreeRDP_Workarea))
  {
    *pMaxWidth = xfc->workArea.width;
    *pMaxHeight = xfc->workArea.height;
  }
  else if (freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen))
  {
    /* If we have specific monitor information then limit the PercentScreen value
     * to only affect the current monitor vs. the entire desktop
     */
    if (vscreen->nmonitors > 0)
    {
      if (!vscreen->monitors)
        goto fail;
 
      const MONITOR_INFO* vmonitor = &vscreen->monitors[current_monitor];
      const RECTANGLE_16* area = &vmonitor->area;
 
      *pMaxWidth = area->right - area->left + 1;
      *pMaxHeight = area->bottom - area->top + 1;
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth))
        *pMaxWidth = ((area->right - area->left + 1) *
                      freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                     100;
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseHeight))
        *pMaxHeight = ((area->bottom - area->top + 1) *
                       freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                      100;
    }
    else
    {
      *pMaxWidth = xfc->workArea.width;
      *pMaxHeight = xfc->workArea.height;
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth))
        *pMaxWidth = (xfc->workArea.width *
                      freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                     100;
 
      if (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseHeight))
        *pMaxHeight = (xfc->workArea.height *
                       freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)) /
                      100;
    }
  }
  else if (freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth) &&
           freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight))
  {
    *pMaxWidth = freerdp_settings_get_uint32(settings, FreeRDP_DesktopWidth);
    *pMaxHeight = freerdp_settings_get_uint32(settings, FreeRDP_DesktopHeight);
  }
 
  /* Create array of all active monitors by taking into account monitors requested on the
   * command-line */
  int nmonitors = 0;
  {
    UINT32 nr = 0;
 
    {
      const UINT32* ids = freerdp_settings_get_pointer(settings, FreeRDP_MonitorIds);
      if (ids)
        nr = *ids;
    }
    for (UINT32 i = 0; i < vscreen->nmonitors; i++)
    {
      MONITOR_ATTRIBUTES* attrs = NULL;
 
      if (!xf_is_monitor_id_active(xfc, i))
        continue;
 
      if (!vscreen->monitors)
        goto fail;
 
      rdpMonitor* monitor = freerdp_settings_get_pointer_array_writable(
          settings, FreeRDP_MonitorDefArray, WINPR_ASSERTING_INT_CAST(size_t, nmonitors));
      monitor->x =
          WINPR_ASSERTING_INT_CAST(
              int32_t, vscreen->monitors[i].area.left*(
                           freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth)
                               ? freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)
                               : 100)) /
          100;
      monitor->y =
          WINPR_ASSERTING_INT_CAST(
              int32_t, vscreen->monitors[i].area.top*(
                           freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseHeight)
                               ? freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)
                               : 100)) /
          100;
      monitor->width =
          WINPR_ASSERTING_INT_CAST(
              int32_t,
              (vscreen->monitors[i].area.right - vscreen->monitors[i].area.left + 1) *
                  (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth)
                       ? freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)
                       : 100)) /
          100;
      monitor->height =
          WINPR_ASSERTING_INT_CAST(
              int32_t,
              (vscreen->monitors[i].area.bottom - vscreen->monitors[i].area.top + 1) *
                  (freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth)
                       ? freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen)
                       : 100)) /
          100;
      monitor->orig_screen = i;
#ifdef USABLE_XRANDR
 
      if (useXRandr && rrmonitors)
      {
        Rotation rot = 0;
        Rotation ret = 0;
        attrs = &monitor->attributes;
        attrs->physicalWidth = WINPR_ASSERTING_INT_CAST(uint32_t, rrmonitors[i].mwidth);
        attrs->physicalHeight = WINPR_ASSERTING_INT_CAST(uint32_t, rrmonitors[i].mheight);
        ret = XRRRotations(xfc->display, WINPR_ASSERTING_INT_CAST(int, i), &rot);
        attrs->orientation = ret;
      }
 
#endif
 
      if (i == nr)
      {
        monitor->is_primary = TRUE;
        if (!freerdp_settings_set_uint32(settings, FreeRDP_MonitorLocalShiftX,
                                         WINPR_ASSERTING_INT_CAST(uint32_t, monitor->x)))
          goto fail;
        if (!freerdp_settings_set_uint32(settings, FreeRDP_MonitorLocalShiftY,
                                         WINPR_ASSERTING_INT_CAST(uint32_t, monitor->y)))
          goto fail;
        primaryMonitorFound = TRUE;
      }
 
      nmonitors++;
    }
  }
 
  /* If no monitor is active(bogus command-line monitor specification) - then lets try to fallback
   * to go fullscreen on the current monitor only */
  if (nmonitors == 0 && vscreen->nmonitors > 0)
  {
    if (!vscreen->monitors)
      goto fail;
 
    const MONITOR_INFO* vmonitor = &vscreen->monitors[current_monitor];
    const RECTANGLE_16* area = &vmonitor->area;
 
    const INT32 width = area->right - area->left + 1;
    const INT32 height = area->bottom - area->top + 1;
    const INT32 maxw =
        ((width < 0) || ((UINT32)width < *pMaxWidth)) ? width : (INT32)*pMaxWidth;
    const INT32 maxh =
        ((height < 0) || ((UINT32)height < *pMaxHeight)) ? width : (INT32)*pMaxHeight;
 
    rdpMonitor* monitor =
        freerdp_settings_get_pointer_array_writable(settings, FreeRDP_MonitorDefArray, 0);
    if (!monitor)
      goto fail;
 
    monitor->x = area->left;
    monitor->y = area->top;
    monitor->width = maxw;
    monitor->height = maxh;
    monitor->orig_screen = current_monitor;
    nmonitors = 1;
  }
 
  if (!freerdp_settings_set_uint32(settings, FreeRDP_MonitorCount,
                                   WINPR_ASSERTING_INT_CAST(uint32_t, nmonitors)))
    goto fail;
 
  /* If we have specific monitor information */
  if (freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount) > 0)
  {
    const rdpMonitor* cmonitor =
        freerdp_settings_get_pointer_array(settings, FreeRDP_MonitorDefArray, 0);
    if (!cmonitor)
      goto fail;
 
    /* Initialize bounding rectangle for all monitors */
    int vX = cmonitor->x;
    int vY = cmonitor->y;
    int vR = vX + cmonitor->width;
    int vB = vY + cmonitor->height;
    xfc->fullscreenMonitors.top = xfc->fullscreenMonitors.bottom =
        xfc->fullscreenMonitors.left = xfc->fullscreenMonitors.right = cmonitor->orig_screen;
 
    /* Calculate bounding rectangle around all monitors to be used AND
     * also set the Xinerama indices which define left/top/right/bottom monitors.
     */
    for (UINT32 i = 0; i < freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount); i++)
    {
      rdpMonitor* monitor =
          freerdp_settings_get_pointer_array_writable(settings, FreeRDP_MonitorDefArray, i);
 
      /* does the same as gdk_rectangle_union */
      int destX = MIN(vX, monitor->x);
      int destY = MIN(vY, monitor->y);
      int destR = MAX(vR, monitor->x + monitor->width);
      int destB = MAX(vB, monitor->y + monitor->height);
 
      if (vX != destX)
        xfc->fullscreenMonitors.left = monitor->orig_screen;
 
      if (vY != destY)
        xfc->fullscreenMonitors.top = monitor->orig_screen;
 
      if (vR != destR)
        xfc->fullscreenMonitors.right = monitor->orig_screen;
 
      if (vB != destB)
        xfc->fullscreenMonitors.bottom = monitor->orig_screen;
 
      const UINT32 ps = freerdp_settings_get_uint32(settings, FreeRDP_PercentScreen);
      WINPR_ASSERT(ps <= 100);
 
      const int psuw =
          freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseWidth) ? (int)ps : 100;
      const int psuh =
          freerdp_settings_get_bool(settings, FreeRDP_PercentScreenUseHeight) ? (int)ps : 100;
      vX = (destX * psuw) / 100;
      vY = (destY * psuh) / 100;
      vR = (destR * psuw) / 100;
      vB = (destB * psuh) / 100;
    }
 
    vscreen->area.left = 0;
    const int r = vR - vX - 1;
    vscreen->area.right = WINPR_ASSERTING_INT_CAST(UINT16, r);
    vscreen->area.top = 0;
    const int b = vB - vY - 1;
    vscreen->area.bottom = WINPR_ASSERTING_INT_CAST(UINT16, b);
 
    if (freerdp_settings_get_bool(settings, FreeRDP_Workarea))
    {
      vscreen->area.top = WINPR_ASSERTING_INT_CAST(UINT16, xfc->workArea.y);
      vscreen->area.bottom =
          WINPR_ASSERTING_INT_CAST(UINT16, xfc->workArea.height + xfc->workArea.y - 1);
    }
 
    if (!primaryMonitorFound)
    {
      /* If we have a command line setting we should use it */
      if (freerdp_settings_get_uint32(settings, FreeRDP_NumMonitorIds) > 0)
      {
        /* The first monitor is the first in the setting which should be used */
        UINT32* ids =
            freerdp_settings_get_pointer_array_writable(settings, FreeRDP_MonitorIds, 0);
        if (ids)
          monitor_index = *ids;
      }
      else
      {
        /* This is the same as when we would trust the Xinerama results..
           and set the monitor index to zero.
           The monitor listed with /list:monitor on index zero is always the primary
        */
        screen = DefaultScreenOfDisplay(xfc->display);
        monitor_index = WINPR_ASSERTING_INT_CAST(uint32_t, XScreenNumberOfScreen(screen));
      }
 
      UINT32 j = monitor_index;
      rdpMonitor* pmonitor =
          freerdp_settings_get_pointer_array_writable(settings, FreeRDP_MonitorDefArray, j);
 
      /* If the "default" monitor is not 0,0 use it */
      if ((pmonitor->x != 0) || (pmonitor->y != 0))
      {
        pmonitor->is_primary = TRUE;
        if (!freerdp_settings_set_uint32(settings, FreeRDP_MonitorLocalShiftX,
                                         WINPR_ASSERTING_INT_CAST(uint32_t, pmonitor->x)))
          goto fail;
        if (!freerdp_settings_set_uint32(settings, FreeRDP_MonitorLocalShiftY,
                                         WINPR_ASSERTING_INT_CAST(uint32_t, pmonitor->y)))
          goto fail;
      }
      else
      {
        /* Lets try to see if there is a monitor with a 0,0 coordinate and use it as a
         * fallback*/
        for (UINT32 i = 0; i < freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount);
             i++)
        {
          rdpMonitor* monitor = freerdp_settings_get_pointer_array_writable(
              settings, FreeRDP_MonitorDefArray, i);
          if (!primaryMonitorFound && monitor->x == 0 && monitor->y == 0)
          {
            monitor->is_primary = TRUE;
            if (!freerdp_settings_set_uint32(
                    settings, FreeRDP_MonitorLocalShiftX,
                    WINPR_ASSERTING_INT_CAST(uint32_t, monitor->x)))
              goto fail;
            if (!freerdp_settings_set_uint32(
                    settings, FreeRDP_MonitorLocalShiftY,
                    WINPR_ASSERTING_INT_CAST(uint32_t, monitor->y)))
              goto fail;
            primaryMonitorFound = TRUE;
          }
        }
      }
    }
 
    /* Subtract monitor shift from monitor variables for server-side use.
     * We maintain monitor shift value as Window requires the primary monitor to have a
     * coordinate of 0,0 In some X configurations, no monitor may have a coordinate of 0,0. This
     * can also be happen if the user requests specific monitors from the command-line as well.
     * So, we make sure to translate our primary monitor's upper-left corner to 0,0 on the
     * server.
     */
    for (UINT32 i = 0; i < freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount); i++)
    {
      rdpMonitor* monitor =
          freerdp_settings_get_pointer_array_writable(settings, FreeRDP_MonitorDefArray, i);
      monitor->x =
          monitor->x -
          WINPR_ASSERTING_INT_CAST(
              int32_t, freerdp_settings_get_uint32(settings, FreeRDP_MonitorLocalShiftX));
      monitor->y =
          monitor->y -
          WINPR_ASSERTING_INT_CAST(
              int32_t, freerdp_settings_get_uint32(settings, FreeRDP_MonitorLocalShiftY));
    }
 
    /* Set the desktop width and height according to the bounding rectangle around the active
     * monitors */
    *pMaxWidth = MIN(*pMaxWidth, (UINT32)vscreen->area.right - vscreen->area.left + 1);
    *pMaxHeight = MIN(*pMaxHeight, (UINT32)vscreen->area.bottom - vscreen->area.top + 1);
  }
 
  /* some 2008 server freeze at logon if we announce support for monitor layout PDU with
   * #monitors < 2. So let's announce it only if we have more than 1 monitor.
   */
  if (freerdp_settings_get_uint32(settings, FreeRDP_MonitorCount) > 1)
  {
    if (!freerdp_settings_set_bool(settings, FreeRDP_SupportMonitorLayoutPdu, TRUE))
      goto fail;
  }
 
  rc = TRUE;
fail:
#ifdef USABLE_XRANDR
 
  if (rrmonitors)
    XRRFreeMonitors(rrmonitors);
 
#endif
  return rc;
}