From c8d0c2af35d27c03efa22d0de8b5a65fcd773b18 Mon Sep 17 00:00:00 2001
From: Sanchayan Maity <maitysanchayan@gmail.com>
Date: Thu, 15 Oct 2020 20:13:18 +0530
Subject: [PATCH] Enable default transparency

---
 config.def.h |  4 ++++
 dwm.c        | 17 ++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index ee97cf1..0d9e747 100644
--- a/config.def.h
+++ b/config.def.h
@@ -5,6 +5,7 @@ static const unsigned int borderpx  = 1;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
+static const double defaultopacity  = 0.75;
 static const char *fonts[]          = { "monospace:size=10" };
 static const char dmenufont[]       = "monospace:size=10";
 static const char col_gray1[]       = "#222222";
@@ -69,6 +70,9 @@ static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY|ShiftMask,		XK_s,	   spawn,	   SHCMD("transset-df -a --dec .1") },
+	{ MODKEY|ShiftMask,		XK_d,	   spawn,	   SHCMD("transset-df -a --inc .1") },
+	{ MODKEY|ShiftMask,		XK_f,	   spawn,	   SHCMD("transset-df -a .75") },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
diff --git a/dwm.c b/dwm.c
index 9f1b668..512d63b 100644
--- a/dwm.c
+++ b/dwm.c
@@ -69,7 +69,7 @@ enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
 enum { SchemeNorm, SchemeSel }; /* color schemes */
 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
-       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
+       NetWMWindowTypeDialog, NetClientList, NetWMWindowsOpacity, NetLast }; /* EWMH atoms */
 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
@@ -174,6 +174,7 @@ static void drawbar(Monitor *m);
 static void drawbars(void);
 static void enternotify(XEvent *e);
 static void expose(XEvent *e);
+static void opacity(Client *c, double opacity);
 static void focus(Client *c);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
@@ -849,6 +850,18 @@ expose(XEvent *e)
 		drawbar(m);
 }
 
+void
+opacity(Client *c, double opacity)
+{
+	if(opacity >= 0 && opacity <= 1) {
+		unsigned long real_opacity[] = { opacity * 0xffffffff };
+		XChangeProperty(dpy, c->win, netatom[NetWMWindowsOpacity], XA_CARDINAL,
+				32, PropModeReplace, (unsigned char *)real_opacity,
+				1);
+	} else
+		XDeleteProperty(dpy, c->win, netatom[NetWMWindowsOpacity]);
+}
+
 void
 focus(Client *c)
 {
@@ -1100,6 +1113,7 @@ manage(Window w, XWindowAttributes *wa)
 	c->oldbw = wa->border_width;
 
 	updatetitle(c);
+	opacity(c, defaultopacity);
 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
 		c->mon = t->mon;
 		c->tags = t->tags;
@@ -1641,6 +1655,7 @@ setup(void)
 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
+	netatom[NetWMWindowsOpacity] = 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);