From 05871c1a5f0d899794d6215c393e96fd592a42d8 Mon Sep 17 00:00:00 2001
From: Jake Koroman <jake@jakekoroman.com>
Date: Tue, 4 Nov 2025 20:33:32 -0500
Subject: x.c: make opacity toggleable.

---
 config.def.h |  4 +++-
 x.c          | 10 ++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index fe266e1..79c16b6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -94,7 +94,8 @@ char *termname = "st-256color";
 unsigned int tabspaces = 8;
 
 /* bg opacity */
-float alpha = 0.8;
+#define DEFAULT_ALPHA 0.8f
+float alpha = DEFAULT_ALPHA;
 
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
@@ -202,6 +203,7 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_C,           clipcopy,       {.i =  0} },
 	{ TERMMOD,              XK_V,           clippaste,      {.i =  0} },
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
+	{ TERMMOD,              XK_T,           togglealpha,    {.i =  0} },
 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
 };
diff --git a/x.c b/x.c
index 881bba6..5e4fc91 100644
--- a/x.c
+++ b/x.c
@@ -55,6 +55,7 @@ static void clipcopy(const Arg *);
 static void clippaste(const Arg *);
 static void numlock(const Arg *);
 static void selpaste(const Arg *);
+static void togglealpha(const Arg *);
 static void zoom(const Arg *);
 static void zoomabs(const Arg *);
 static void zoomreset(const Arg *);
@@ -281,6 +282,15 @@ clippaste(const Arg *dummy)
 			xw.win, CurrentTime);
 }
 
+void
+togglealpha(const Arg *dummy)
+{
+    alpha = alpha != 1.0f ? 1.0f : DEFAULT_ALPHA;
+    dc.col[defaultbg].color.alpha = (unsigned short)(0xFFFF * alpha);
+    cresize(0, 0);
+    redraw();
+}
+
 void
 selpaste(const Arg *dummy)
 {
-- 
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