From 6b74c702453db283862f92320899c571cbc7b357 Mon Sep 17 00:00:00 2001
From: Thierry Lorthiois <lorthiois@bbsoft.fr>
Date: Fri, 15 Jan 2010 22:23:00 +0000
Subject: [PATCH] replace real_transparency option with an autodetect of
 composite manager.

---
 src/config.c | 2 --
 src/server.c | 7 +++++++
 src/server.h | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/config.c b/src/config.c
index f4e91a8..db0f1f8 100644
--- a/src/config.c
+++ b/src/config.c
@@ -295,8 +295,6 @@ void add_entry (char *key, char *value)
 		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;
diff --git a/src/server.c b/src/server.c
index c1401ae..2d7de6e 100644
--- a/src/server.c
+++ b/src/server.c
@@ -69,6 +69,7 @@ void server_init_atoms ()
 	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);
@@ -326,6 +327,12 @@ void server_init_visual()
 	}
 	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;
 		printf("real transparency on... depth: %d\n", server.depth);
diff --git a/src/server.h b/src/server.h
index ffd0831..11ea89b 100644
--- a/src/server.h
+++ b/src/server.h
@@ -51,6 +51,7 @@ typedef struct Global_atom
 	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;
-- 
2.44.0