change alpha patch

config.def.h

@@ -99,6 +99,9 @@ unsigned int tabspaces = 8;
 /* bg opacity */
 float alpha = 0.8;
 
+/* Background opacity */
+float alpha_def;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* 8 normal colors */
@@ -249,6 +252,9 @@ static Shortcut shortcuts[] = {
     { ControlMask,          XK_Page_Down,   kscrolldown,    {.i =  10} },
     { ControlMask,          XK_k,           kscrollup,      {.i =  1} },
     { ControlMask,          XK_j,           kscrolldown,    {.i =  1} },
+	{ TERMMOD,              XK_N,           chgalpha,       {.f = -1} }, /* Decrease opacity */
+	{ TERMMOD,              XK_M,           chgalpha,       {.f = +1} }, /* Increase opacity */
+	{ TERMMOD,              XK_B,           chgalpha,       {.f =  0} }, /* Reset opacity */
 };
 
 /*

config.h

@@ -99,6 +99,9 @@ unsigned int tabspaces = 8;
 /* bg opacity */
 float alpha = 0.8;
 
+/* Background opacity */
+float alpha_def;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* 8 normal colors */
@@ -249,6 +252,9 @@ static Shortcut shortcuts[] = {
     { ControlMask,          XK_Page_Down,   kscrolldown,    {.i =  10} },
     { ControlMask,          XK_k,           kscrollup,      {.i =  1} },
     { ControlMask,          XK_j,           kscrolldown,    {.i =  1} },
+	{ TERMMOD,              XK_N,           chgalpha,       {.f = -1} }, /* Decrease opacity */
+	{ TERMMOD,              XK_M,           chgalpha,       {.f = +1} }, /* Increase opacity */
+	{ TERMMOD,              XK_B,           chgalpha,       {.f =  0} }, /* Reset opacity */
 };
 
 /*

patches/st-changealpha-20230519-b44f2ad.diff

@@ -0,0 +1,80 @@
+diff --git a/config.def.h b/config.def.h
+index 91ab8ca..8a06176 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -93,6 +93,9 @@ char *termname = "st-256color";
+  */
+ unsigned int tabspaces = 8;
+ 
++/* Background opacity */
++float alpha_def;
++
+ /* Terminal colors (16 first used in escape sequence) */
+ static const char *colorname[] = {
+ 	/* 8 normal colors */
+@@ -201,6 +204,9 @@ static Shortcut shortcuts[] = {
+ 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
+ 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
+ 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
++	{ MODKEY,               XK_bracketleft, chgalpha,       {.f = -1} }, /* Decrease opacity */
++	{ MODKEY|ShiftMask,     XK_braceright,  chgalpha,       {.f = +1} }, /* Increase opacity */
++	{ MODKEY,               XK_bracketright,chgalpha,       {.f =  0} }, /* Reset opacity */
+ };
+ 
+ /*
+diff --git a/st.h b/st.h
+index fd3b0d8..3bb587e 100644
+--- a/st.h
++++ b/st.h
+@@ -124,3 +124,4 @@ extern unsigned int tabspaces;
+ extern unsigned int defaultfg;
+ extern unsigned int defaultbg;
+ extern unsigned int defaultcs;
++extern float alpha_def;
+diff --git a/x.c b/x.c
+index aa09997..f8c8c1a 100644
+--- a/x.c
++++ b/x.c
+@@ -59,6 +59,7 @@ static void zoom(const Arg *);
+ static void zoomabs(const Arg *);
+ static void zoomreset(const Arg *);
+ static void ttysend(const Arg *);
++static void chgalpha(const Arg *);
+ 
+ /* config.h for applying patches and the configuration. */
+ #include "config.h"
+@@ -1147,6 +1148,9 @@ xinit(int cols, int rows)
+ 	usedfont = (opt_font == NULL)? font : opt_font;
+ 	xloadfonts(usedfont, 0);
+ 
++   /* Backup default alpha value */
++   alpha_def = alpha;
++
+ 	/* colors */
+ 	xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
+ 	xloadcols();
+@@ -1371,6 +1375,24 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
+ 	return numspecs;
+ }
+ 
++void
++chgalpha(const Arg *arg)
++{
++   if (arg->f == -1.0f && alpha >= 0.1f)
++      alpha -= 0.1f;
++   else if (arg->f == 1.0f && alpha < 1.0f)
++      alpha += 0.1f;
++   else if (arg->f == 0.0f)
++      alpha = alpha_def;
++   else
++      return;
++
++   dc.col[defaultbg].color.alpha = (unsigned short)(0xFFFF * alpha);
++   /* Required to remove artifacting from borderpx */
++   cresize(0, 0);
++   redraw();
++}
++
+ void
+ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y)
+ {

st.h

@@ -134,3 +134,4 @@ extern unsigned int defaultfg;
 extern unsigned int defaultbg;
 extern unsigned int defaultcs;
 extern float alpha;
+extern float alpha_def;

x.c

@@ -73,6 +73,7 @@ static void zoom(const Arg *);
 static void zoomabs(const Arg *);
 static void zoomreset(const Arg *);
 static void ttysend(const Arg *);
+static void chgalpha(const Arg *);
 
 /* config.h for applying patches and the configuration. */
 #include "config.h"
@@ -1281,6 +1282,9 @@ xinit(int cols, int rows)
 	/* spare fonts */
 	xloadsparefonts();
 
+   /* Backup default alpha value */
+   alpha_def = alpha;
+
 	/* colors */
 	xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
 	xloadcols();
@@ -1501,6 +1505,24 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
 	return numspecs;
 }
 
+void
+chgalpha(const Arg *arg)
+{
+   if (arg->f == -1.0f && alpha >= 0.1f)
+      alpha -= 0.1f;
+   else if (arg->f == 1.0f && alpha < 1.0f)
+      alpha += 0.1f;
+   else if (arg->f == 0.0f)
+      alpha = alpha_def;
+   else
+      return;
+
+   dc.col[defaultbg].color.alpha = (unsigned short)(0xFFFF * alpha);
+   /* Required to remove artifacting from borderpx */
+   cresize(0, 0);
+   redraw();
+}
+
 void
 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y, int dmode)
 {