From 2d74e49c4faf4d9a6a5901e22cab8df1f0c5f4c5 Mon Sep 17 00:00:00 2001
From: Utkarsh Verma <utkarshverma@protonmail.com>
Date: Sat, 24 Sep 2022 10:43:14 +0200
Subject: [PATCH] Add function for changing alpha (#47)

Co-authored-by: Stein Gunnar Bakkeby <bakkeby@gmail.com>
---
 config.def.h      |  8 ++++++++
 patch/alpha.c     | 32 ++++++++++++++++++++++++++++++++
 patch/alpha.h     |  5 +++++
 patch/x_include.c |  3 +++
 patch/x_include.h |  3 +++
 5 files changed, 51 insertions(+)
 create mode 100644 patch/alpha.c
 create mode 100644 patch/alpha.h

diff --git a/config.def.h b/config.def.h
index 02fa4ca..ff6b5b3 100644
--- a/config.def.h
+++ b/config.def.h
@@ -393,6 +393,14 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Home,        zoomreset,       {.f =  0} },
 	{ TERMMOD,              XK_C,           clipcopy,        {.i =  0} },
 	{ TERMMOD,              XK_V,           clippaste,       {.i =  0} },
+	#if ALPHA_PATCH
+	{ TERMMOD,              XK_O,           changealpha,     {.f = +0.05} },
+	{ TERMMOD,              XK_P,           changealpha,     {.f = -0.05} },
+	#if ALPHA_FOCUS_HIGHLIGHT_PATCH
+	//{ TERMMOD,              XK_,           changealphaunfocused, {.f = +0.05} },
+	//{ TERMMOD,              XK_,           changealphaunfocused, {.f = -0.05} },
+	#endif // ALPHA_FOCUS_HIGHLIGHT_PATCH
+	#endif // ALPHA_PATCH
 	#if SCROLLBACK_PATCH
 	{ ShiftMask,            XK_Page_Up,     kscrollup,       {.i = -1}, S_PRI },
 	{ ShiftMask,            XK_Page_Down,   kscrolldown,     {.i = -1}, S_PRI },
diff --git a/patch/alpha.c b/patch/alpha.c
new file mode 100644
index 0000000..6a793a4
--- /dev/null
+++ b/patch/alpha.c
@@ -0,0 +1,32 @@
+float
+clamp(float value, float lower, float upper) {
+	if (value < lower)
+		return lower;
+	if (value > upper)
+		return upper;
+	return value;
+}
+
+void
+changealpha(const Arg *arg)
+{
+	if ((alpha > 0 && arg->f < 0) || (alpha < 1 && arg->f > 0))
+		alpha += arg->f;
+	alpha = clamp(alpha, 0.0, 1.0);
+	xloadcols();
+	redraw();
+	fprintf(stderr, "changealpha %f\n", arg->f);
+}
+
+#if ALPHA_FOCUS_HIGHLIGHT_PATCH
+void
+changealphaunfocused(const Arg *arg)
+{
+	if ((alphaUnfocused > 0 && arg->f < 0) || (alphaUnfocused < 1 && arg->f > 0))
+		alphaUnfocused += arg->f;
+	alphaUnfocused = clamp(alphaUnfocused, 0.0, 1.0);
+	xloadcols();
+	redraw();
+	fprintf(stderr, "changealphaunfocused %f\n", arg->f);
+}
+#endif // ALPHA_FOCUS_HIGHLIGHT_PATCH
diff --git a/patch/alpha.h b/patch/alpha.h
new file mode 100644
index 0000000..2d01830
--- /dev/null
+++ b/patch/alpha.h
@@ -0,0 +1,5 @@
+static float clamp(float value, float lower, float upper);
+static void changealpha(const Arg *);
+#if ALPHA_FOCUS_HIGHLIGHT_PATCH
+static void changealphaunfocused(const Arg *arg);
+#endif // ALPHA_FOCUS_HIGHLIGHT_PATCH
diff --git a/patch/x_include.c b/patch/x_include.c
index 19d2a30..cd058a1 100644
--- a/patch/x_include.c
+++ b/patch/x_include.c
@@ -1,4 +1,7 @@
 /* Patches */
+#if ALPHA_PATCH
+#include "alpha.c"
+#endif
 #if BACKGROUND_IMAGE_PATCH
 #include "background_image_x.c"
 #endif
diff --git a/patch/x_include.h b/patch/x_include.h
index a737408..3eb1d19 100644
--- a/patch/x_include.h
+++ b/patch/x_include.h
@@ -1,4 +1,7 @@
 /* Patches */
+#if ALPHA_PATCH
+#include "alpha.h"
+#endif
 #if BACKGROUND_IMAGE_PATCH
 #include "background_image_x.h"
 #endif