Window: Add clientFrame(), to get the eventually set CSD extents

This only supports GTK+ at the moment, but it might be adapted to
other toolkits.

include/compiz-core.h

@@ -2639,6 +2639,7 @@ struct _CompWindow {
 
     CompWindowExtents input;
     CompWindowExtents output;
+    CompWindowExtents clientFrame;
 
     CompStruts *struts;
 
@@ -2815,6 +2816,9 @@ updateTransientHint (CompWindow *w);
 void
 updateIconGeometry (CompWindow *w);
 
+void
+updateClientFrame (CompWindow *w);
+
 Window
 getClientLeader (CompWindow *w);
 

src/event.c

@@ -1544,6 +1544,12 @@ handleEvent (CompDisplay *d,
 	    if (w)
 		updateIconGeometry (w);
 	}
+	else if (event->xproperty.atom == d->frameGtkExtentsAtom)
+	{
+	    w = findWindowAtDisplay (d, event->xproperty.window);
+	    if (w)
+		updateClientFrame (w);
+	}
 	else if (event->xproperty.atom == d->winOpacityAtom)
 	{
 	    w = findWindowAtDisplay (d, event->xproperty.window);

src/window.c

@@ -452,6 +452,42 @@ updateIconGeometry (CompWindow *w)
     }
 }
 
+void
+updateClientFrame (CompWindow *w)
+{
+    Atom	  actual;
+    int		  result, format;
+    unsigned long n, left;
+    unsigned char *data;
+
+    result = XGetWindowProperty (w->screen->display->display, w->id,
+				 w->screen->display->frameGtkExtentsAtom,
+				 0L, 65536, False, XA_CARDINAL,
+				 &actual, &format, &n, &left, &data);
+
+    if (result == Success && actual == XA_CARDINAL && data)
+    {
+	if (n == 4)
+	{
+	    unsigned long *extents = *(unsigned long **) &data;
+
+	    w->clientFrame.left = extents[0];
+	    w->clientFrame.right = extents[1];
+	    w->clientFrame.top = extents[2];
+	    w->clientFrame.bottom = extents[3];
+	}
+
+	XFree (data);
+    }
+    else
+    {
+        w->clientFrame.left = 0;
+        w->clientFrame.right = 0;
+        w->clientFrame.top = 0;
+        w->clientFrame.bottom = 0;
+    }
+}
+
 static Window
 getClientLeaderOfAncestor (CompWindow *w)
 {
@@ -2347,6 +2383,7 @@ addWindow (CompScreen *screen,
 
     recalcWindowActions (w);
     updateIconGeometry (w);
+    updateClientFrame (w);
 
     if (w->shaded)
 	resizeWindow (w,