gdi32: Don't return screen resolution on printer devices.

dlls/gdi32/driver.c

@@ -355,7 +355,7 @@ static INT nulldrv_GetDeviceCaps( PHYSDEV dev, INT cap )
     case SCALINGFACTORY:  return 0;
     case VREFRESH:        return GetDeviceCaps( dev->hdc, TECHNOLOGY ) == DT_RASDISPLAY ? 1 : 0;
     case DESKTOPHORZRES:
-        if (pGetSystemMetrics)
+        if (GetDeviceCaps( dev->hdc, TECHNOLOGY ) == DT_RASDISPLAY && pGetSystemMetrics)
         {
             DPI_AWARENESS_CONTEXT context;
             UINT ret;
@@ -366,7 +366,7 @@ static INT nulldrv_GetDeviceCaps( PHYSDEV dev, INT cap )
         }
         return GetDeviceCaps( dev->hdc, HORZRES );
     case DESKTOPVERTRES:
-        if (pGetSystemMetrics)
+        if (GetDeviceCaps( dev->hdc, TECHNOLOGY ) == DT_RASDISPLAY && pGetSystemMetrics)
         {
             DPI_AWARENESS_CONTEXT context;
             UINT ret;

dlls/gdi32/tests/dc.c

@@ -471,6 +471,12 @@ static void test_device_caps( HDC hdc, HDC ref_dc, const char *descr, int scale
         }
         else
         {
+            ok( GetDeviceCaps( ref_dc, DESKTOPHORZRES ) == GetDeviceCaps( ref_dc, HORZRES ),
+                "Got DESKTOPHORZRES %d on %s, expected %d\n",
+                GetDeviceCaps( ref_dc, DESKTOPHORZRES ), descr, GetDeviceCaps( ref_dc, HORZRES ));
+            ok( GetDeviceCaps( ref_dc, DESKTOPVERTRES ) == GetDeviceCaps( ref_dc, VERTRES ),
+                "Got DESKTOPVERTRES %d on %s, expected %d\n",
+                GetDeviceCaps( ref_dc, DESKTOPVERTRES ), descr, GetDeviceCaps( ref_dc, VERTRES ));
             SetRect( &ref_rect, 0, 0, GetDeviceCaps( ref_dc, DESKTOPHORZRES ),
                      GetDeviceCaps( ref_dc, DESKTOPVERTRES ) );
         }