check for damage and render extensions if going to use composite. require them for it. also include the cflags/libs. and only run the xcomposite stuff so far when the server supports it

Makefile.am

@@ -118,6 +118,9 @@ openbox_openbox_CPPFLAGS = \
 	$(XRANDR_CFLAGS) \
 	$(XSHAPE_CFLAGS) \
 	$(XSYNC_CFLAGS) \
+	$(XRENDER_CFLAGS) \
+	$(XDAMAGE_CFLAGS) \
+	$(XCOMPOSITE_CFLAGS) \
 	$(X_CFLAGS) \
 	$(XCURSOR_CFLAGS) \
 	$(SM_CFLAGS) \
@@ -137,6 +140,9 @@ openbox_openbox_LDADD = \
 	$(XSHAPE_LIBS) \
 	$(XSYNC_LIBS) \
 	$(GLIB_LIBS) \
+	$(XRENDER_LIBS) \
+	$(XDAMAGE_LIBS) \
+	$(XCOMPOSITE_LIBS) \
 	$(X_LIBS) \
 	$(XCURSOR_LIBS) \
 	$(LIBSN_LIBS) \

configure.ac

@@ -146,12 +146,32 @@ AC_ARG_ENABLE(xcomposite,
 )
 
 if test "$enable_xcomposite" = yes; then
-PKG_CHECK_MODULES(XCOMPOSITE, [xcomposite],
+PKG_CHECK_MODULES(XRENDER, [xrender],
   [
-    AC_DEFINE(USE_XCOMPOSITE, [1], [Use X Composite library])
-    AC_SUBST(XCOMPOSITE_CFLAGS)
-    AC_SUBST(XCOMPOSITE_LIBS)
-    xcomposite_found=yes
+    AC_DEFINE(USE_XRENDER, [1], [Use X Render library])
+    AC_SUBST(XRENDER_CFLAGS)
+    AC_SUBST(XRENDER_LIBS)
+    PKG_CHECK_MODULES(XDAMAGE, [xdamage],
+      [
+        AC_DEFINE(USE_XDAMAGE, [1], [Use X Damage library])
+        AC_SUBST(XDAMAGE_CFLAGS)
+        AC_SUBST(XDAMAGE_LIBS)
+        PKG_CHECK_MODULES(XCOMPOSITE, [xcomposite],
+          [ 
+            AC_DEFINE(USE_XCOMPOSITE, [1], [Use X Composite library])	
+            AC_SUBST(XCOMPOSITE_CFLAGS)	   
+            AC_SUBST(XCOMPOSITE_LIBS)
+            xcomposite_found=yes
+          ],
+          [
+            xcomposite_found=no
+          ]
+        )
+      ],
+      [
+        xcomposite_found=no
+      ]
+    )
   ],
   [
     xcomposite_found=no

openbox/extensions.h

@@ -39,6 +39,11 @@
 #ifdef    SYNC
 #include <X11/extensions/sync.h>
 #endif
+#ifdef    USE_XCOMPOSITE
+#include <X11/extensions/Xcomposite.h>
+#include <X11/extensions/Xdamage.h>
+#include <X11/extensions/Xrender.h>
+#endif
 
 #include <glib.h>
 

openbox/screen.c

@@ -365,10 +365,12 @@ void screen_startup(gboolean reconfig)
     }
 
 #ifdef USE_XCOMPOSITE
-    /* Redirect window contents to offscreen pixmaps */
-    XCompositeRedirectSubwindows(ob_display,
-                                 RootWindow(ob_display, ob_screen),
-                                 CompositeRedirectAutomatic);
+    if (extensions_comp) {
+        /* Redirect window contents to offscreen pixmaps */
+        XCompositeRedirectSubwindows(ob_display,
+                                     RootWindow(ob_display, ob_screen),
+                                     CompositeRedirectAutomatic);
+    }
 #endif
 
     /* get the initial size */