M src/config.c → src/config.c

@@ -295,8 +295,6 @@ else if (strcmp (key, "panel_dock") == 0)
 		panel_dock = atoi (value);
 	else if (strcmp (key, "urgent_nb_of_blink") == 0)
 		max_tick_urgent = (atoi (value) * 2) + 1;
-	else if (strcmp (key, "real_transparency") == 0)
-		real_transparency = atoi(value);
 	else if (strcmp (key, "panel_layer") == 0) {
 		if (strcmp(value, "bottom") == 0)
 			panel_layer = BOTTOM_LAYER;

M src/server.c → src/server.c

@@ -69,6 +69,7 @@ server.atom._NET_WM_ICON = XInternAtom (server.dsp, "_NET_WM_ICON", False);
 	server.atom._NET_CLOSE_WINDOW = XInternAtom (server.dsp, "_NET_CLOSE_WINDOW", False);
 	server.atom.UTF8_STRING = XInternAtom (server.dsp, "UTF8_STRING", False);
 	server.atom._NET_SUPPORTING_WM_CHECK = XInternAtom (server.dsp, "_NET_SUPPORTING_WM_CHECK", False);
+	server.atom._NET_WM_CM_S0 = XInternAtom (server.dsp, "_NET_WM_CM_S0", False);
 	server.atom._NET_SUPPORTING_WM_CHECK = XInternAtom (server.dsp, "_NET_WM_NAME", False);
 	server.atom._NET_WM_STRUT_PARTIAL = XInternAtom (server.dsp, "_NET_WM_STRUT_PARTIAL", False);
 	server.atom.WM_NAME = XInternAtom(server.dsp, "WM_NAME", False);
@@ -325,6 +326,12 @@ }
 		}
 	}
 	XFree (xvi);
+
+	// check composite manager
+	if (XGetSelectionOwner(server.dsp, server.atom._NET_WM_CM_S0) == None)
+		real_transparency = 0;
+	else
+		real_transparency = 1;
 
 	if (visual && real_transparency) {
 		server.depth = 32;

M src/server.h → src/server.h

@@ -51,6 +51,7 @@ Atom _NET_WM_ICON;
 	Atom _NET_CLOSE_WINDOW;
 	Atom UTF8_STRING;
 	Atom _NET_SUPPORTING_WM_CHECK;
+	Atom _NET_WM_CM_S0;
 	Atom _NET_WM_STRUT_PARTIAL;
 	Atom WM_NAME;
 	Atom __SWM_VROOT;