winex11.drv: Get virtual desktop size limit from the host primary display.

dlls/winex11.drv/desktop.c

@@ -238,12 +238,14 @@ static void X11DRV_desktop_free_monitors( struct x11drv_monitor *monitors )
  */
 void X11DRV_init_desktop( Window win, unsigned int width, unsigned int height )
 {
-    RECT primary_rect;
+    RECT primary_rect = get_host_primary_monitor_rect();
 
     root_window = win;
     managed_mode = FALSE;  /* no managed windows in desktop mode */
     desktop_width = width;
     desktop_height = height;
+    max_width = primary_rect.right;
+    max_height = primary_rect.bottom;
 
     /* Initialize virtual desktop mode display device handler */
     desktop_handler.name = "Virtual Desktop";
@@ -257,10 +259,6 @@ void X11DRV_init_desktop( Window win, unsigned int width, unsigned int height )
     TRACE("Display device functions are now handled by: Virtual Desktop\n");
     X11DRV_DisplayDevices_Init( TRUE );
 
-    primary_rect = get_primary_monitor_rect();
-    max_width = primary_rect.right - primary_rect.left;
-    max_height = primary_rect.bottom - primary_rect.top;
-
     /* initialize the available resolutions */
     dd_modes = X11DRV_Settings_SetHandlers("desktop", 
                                            X11DRV_desktop_GetCurrentMode, 

dlls/winex11.drv/display.c

@@ -233,6 +233,27 @@ RECT get_primary_monitor_rect(void)
     return primary;
 }
 
+/* Get the primary monitor rect from the host system */
+RECT get_host_primary_monitor_rect(void)
+{
+    INT gpu_count, adapter_count, monitor_count;
+    struct x11drv_gpu *gpus = NULL;
+    struct x11drv_adapter *adapters = NULL;
+    struct x11drv_monitor *monitors = NULL;
+    RECT rect = {0};
+
+    /* The first monitor is always primary */
+    if (host_handler.get_gpus(&gpus, &gpu_count) && gpu_count &&
+        host_handler.get_adapters(gpus[0].id, &adapters, &adapter_count) && adapter_count &&
+        host_handler.get_monitors(adapters[0].id, &monitors, &monitor_count) && monitor_count)
+        rect = monitors[0].rc_monitor;
+
+    if (gpus) host_handler.free_gpus(gpus);
+    if (adapters) host_handler.free_adapters(adapters);
+    if (monitors) host_handler.free_monitors(monitors);
+    return rect;
+}
+
 void X11DRV_DisplayDevices_SetHandler(const struct x11drv_display_device_handler *new_handler)
 {
     if (new_handler->priority > host_handler.priority)

dlls/winex11.drv/x11drv.h

@@ -643,6 +643,7 @@ extern POINT virtual_screen_to_root( INT x, INT y ) DECLSPEC_HIDDEN;
 extern POINT root_to_virtual_screen( INT x, INT y ) DECLSPEC_HIDDEN;
 extern RECT get_virtual_screen_rect(void) DECLSPEC_HIDDEN;
 extern RECT get_primary_monitor_rect(void) DECLSPEC_HIDDEN;
+extern RECT get_host_primary_monitor_rect(void) DECLSPEC_HIDDEN;
 extern void query_work_area( RECT *rc_work ) DECLSPEC_HIDDEN;
 extern void xinerama_init( unsigned int width, unsigned int height ) DECLSPEC_HIDDEN;