Track changes to _XROOTPMAP_ID property

[dana/xcompmgr.git] / xcompmgr.c

diff --git a/xcompmgr.c b/xcompmgr.c
index 0662b82..299a511 100644 (file)
--- a/xcompmgr.c
+++ b/xcompmgr.c
@@ -65,6 +65,7 @@ Picture               rootTile;
 XserverRegion  allDamage;
 int            root_height, root_width;
 
+#define BACKGROUND_PROP        "_XROOTPMAP_ID"
 #define WINDOW_PLAIN   0
 #define WINDOW_DROP    1
 #define WINDOW_TRANS   2
@@ -326,7 +327,7 @@ root_tile (Display *dpy)
     Bool           fill;
     XRenderPictureAttributes   pa;
 
-    if (XGetWindowProperty (dpy, root, XInternAtom (dpy, "_XROOTPMAP_ID", False),
+    if (XGetWindowProperty (dpy, root, XInternAtom (dpy, BACKGROUND_PROP, False),
                            0, 4, False, AnyPropertyType,
                            &actual_type, &actual_format, &nitems, &bytes_after, &prop) == Success &&
        actual_type == XInternAtom (dpy, "PIXMAP", False) && actual_format == 32 && nitems == 1)
@@ -816,7 +817,11 @@ main ()
     XGrabServer (dpy);
     XCompositeRedirectSubwindows (dpy, root, CompositeRedirectManual);
     paint_all (dpy, None);
-    XSelectInput (dpy, root, SubstructureNotifyMask|ExposureMask|StructureNotifyMask);
+    XSelectInput (dpy, root, 
+                 SubstructureNotifyMask|
+                 ExposureMask|
+                 StructureNotifyMask|
+                 PropertyChangeMask);
     XQueryTree (dpy, root, &root_return, &parent_return, &children, &nchildren);
     for (i = 0; i < nchildren; i++)
        add_win (dpy, children[i], i ? children[i-1] : None);
@@ -882,6 +887,17 @@ main ()
                    }
                }
                break;
+           case PropertyNotify:
+               if (ev.xproperty.atom == XInternAtom (dpy, BACKGROUND_PROP, False))
+               {
+                   if (rootTile)
+                   {
+                       XClearArea (dpy, root, 0, 0, 0, 0, True);
+                       XRenderFreePicture (dpy, rootTile);
+                       rootTile = None;
+                   }
+               }
+               break;
            default:
                if (ev.type == damage_event + XDamageNotify)
                    damage_win (dpy, (XDamageNotifyEvent *) &ev);