Index: Xrender.c
===================================================================
RCS file: /local/src/CVS/Xrender/Xrender.c,v
retrieving revision 1.16
diff -u -r1.16 Xrender.c
--- Xrender.c	24 Apr 2003 03:29:15 -0000	1.16
+++ Xrender.c	8 May 2003 15:28:29 -0000
@@ -64,6 +64,42 @@
 }
 
 /*
+ * If the server is missing support for any of the required depths on
+ * any screen, tell the application that Render is not present.
+ */
+
+#define DEPTH_MASK(d)	(1 << ((d) - 1))
+    
+/*
+ * Render requires support for depth 1, 4, 8, 24 and 32 pixmaps
+ */
+
+#define REQUIRED_DEPTHS	(DEPTH_MASK(1) | \
+			 DEPTH_MASK(4) | \
+			 DEPTH_MASK(8) | \
+			 DEPTH_MASK(24) | \
+			 DEPTH_MASK(32))
+    
+static Bool
+XRenderHasDepths (Display *dpy)
+{
+    int	s;
+
+    for (s = 0; s < ScreenCount (dpy); s++)
+    {
+	CARD32		    depths = 0;
+	Screen		    *scr = ScreenOfDisplay (dpy, s);
+	int		    d;
+
+	for (d = 0; d < scr->ndepths; d++)
+	    depths |= DEPTH_MASK(scr->depths[d].depth);
+	if (~depths & REQUIRED_DEPTHS)
+	    return False;
+    }
+    return True;
+}
+
+/*
  * XRenderExtAddDisplay - add a display to this extension. (Replaces
  * XextAddDisplay)
  */
@@ -77,8 +113,12 @@
     dpyinfo = (XRenderExtDisplayInfo *) Xmalloc (sizeof (XRenderExtDisplayInfo));
     if (!dpyinfo) return NULL;
     dpyinfo->display = dpy;
     dpyinfo->data = NULL;
-    dpyinfo->codes = XInitExtension (dpy, ext_name);
+
+    if (XRenderHasDepths (dpy))
+	dpyinfo->codes = XInitExtension (dpy, ext_name);
+    else
+	dpyinfo->codes = NULL;
 
     /*
      * if the server has the extension, then we can initialize the