(Fx_display_color_cells): Force 24+ bit color depths to 24-bit.

src/ChangeLog

+2002-03-08  Juanma Barranquero  <lektu@terra.es>
+
+	* w32fns.c (Fx_display_color_cells): Force 24+ bit color depths to
+	24-bit.
+
 2002-03-06  Jason Rumney  <jasonr@gnu.org>
 
 	* w32term.c (x_draw_hollow_cursor): Draw same size as block cursor.

src/w32fns.c

@@ -7768,8 +7768,10 @@ If omitted or nil, that stands for the selected frame's display.  */)
   else
     cap = GetDeviceCaps (hdc,NUMCOLORS);
 
+  /* We force 24+ bit depths to 24-bit, both to prevent an overflow
+     and because probably is more meaningful on Windows anyway */
   if (cap < 0)
-    cap = 1 << (dpyinfo->n_planes * dpyinfo->n_cbits);
+    cap = 1 << min(dpyinfo->n_planes * dpyinfo->n_cbits, 24);
   
   ReleaseDC (dpyinfo->root_window, hdc);