From 30f405da4e8932b91d3b27dbe3da794e2eaab2a7 Mon Sep 17 00:00:00 2001
From: Jason Woofenden <jason@jasonwoof.com>
Date: Sun, 16 Nov 2014 20:29:51 -0500
Subject: [PATCH] make non-focused windows translucent

---
 dwm.c |   23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/dwm.c b/dwm.c
index f896170..31fad43 100644
--- a/dwm.c
+++ b/dwm.c
@@ -60,7 +60,7 @@
 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel, SchemeLast }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState,
-       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
+       NetWMFullscreen, NetWMWindowOpacity, NetActiveWindow, NetWMWindowType,
        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
@@ -267,6 +267,20 @@ static Fnt *fnt;
 static Monitor *mons, *selmon;
 static Window root;
 
+// unfocused windows get transparent (feature)
+static const unsigned long unfocused_opacity[] = { 0xbfffffff };
+static void window_set_opaque(Client *c);
+static void window_set_translucent(Client *c);
+void
+window_set_opaque(Client *c) {
+	XChangeProperty(dpy, c->win, netatom[NetWMWindowOpacity], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)unfocused_opacity, 1);
+}
+void
+window_set_translucent(Client *c) {
+	XDeleteProperty(dpy, c->win, netatom[NetWMWindowOpacity]);
+}
+
+
 /* configuration, allows nested code to access above variables */
 #include "config.h"
 
@@ -784,6 +798,10 @@ focus(Client *c) {
 	/* was if(selmon->sel) */
 	if(selmon->sel && selmon->sel != c)
 		unfocus(selmon->sel, False);
+	if(selmon->sel && c!=selmon->sel && c && (!root || (selmon->sel->win!=root && c->win!=root)) )
+		window_set_opaque(selmon->sel);
+	if(c && c!=selmon->sel && (!root || (c->win!=root)) )
+		window_set_translucent(c);
 	if(c) {
 		if(c->mon != selmon)
 			selmon = c->mon;
@@ -801,6 +819,8 @@ focus(Client *c) {
 	}
 	selmon->sel = c;
 	drawbars();
+	if(c)
+		window_set_translucent(c);
 }
 
 void
@@ -1523,6 +1543,7 @@ setup(void) {
 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
+	netatom[NetWMWindowOpacity] = XInternAtom(dpy, "_NET_WM_WINDOW_OPACITY", False);
 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
-- 
1.7.10.4