From 482279846da3abe4272fb7e7fbb380a067a2cc94 Mon Sep 17 00:00:00 2001
From: DustVoice <info@dustvoice.de>
Date: Sat, 8 Aug 2020 16:04:46 +0200
Subject: [PATCH] Add invert patch

---
 config.def.h |  1 +
 x.c          | 37 ++++++++++++++++++++++++++++++++++---
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/config.def.h b/config.def.h
index 8651561..e861a57 100644
--- a/config.def.h
+++ b/config.def.h
@@ -218,6 +218,7 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
 	{ ShiftMask,            XK_Page_Up,     kscrollup,      {.i = -1} },
 	{ ShiftMask,            XK_Page_Down,   kscrolldown,    {.i = -1} },
+	{ TERMMOD,              XK_X,           invert,         { }       },
 };
 
 /*
diff --git a/x.c b/x.c
index e36220d..7ad36f1 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 invert(const Arg *);
 
 /* config.h for applying patches and the configuration. */
 #include "config.h"
@@ -258,9 +259,29 @@ static char *opt_line  = NULL;
 static char *opt_name  = NULL;
 static char *opt_title = NULL;
 
+static int invertcolors = 0;
 static int oldbutton = 3; /* button event on startup: 3 = release */
 static int cursorblinks = 0;
 
+void
+invert(const Arg *dummy)
+{
+	invertcolors = !invertcolors;
+	redraw();
+}
+
+Color
+invertedcolor(Color *clr) {
+	XRenderColor rc;
+	Color inverted;
+	rc.red = ~clr->color.red;
+	rc.green = ~clr->color.green;
+	rc.blue = ~clr->color.blue;
+	rc.alpha = clr->color.alpha;
+	XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &rc, &inverted);
+	return inverted;
+}
+
 void
 clipcopy(const Arg *dummy)
 {
@@ -838,9 +859,12 @@ xsetcolorname(int x, const char *name)
 void
 xclear(int x1, int y1, int x2, int y2)
 {
-	XftDrawRect(xw.draw,
-			&dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
-			x1, y1, x2-x1, y2-y1);
+	Color c;
+	c = dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg];
+	if (invertcolors) {
+		c = invertedcolor(&c);
+	}
+	XftDrawRect(xw.draw, &c, x1, y1, x2-x1, y2-y1);
 }
 
 void
@@ -1453,6 +1477,13 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
 	if (base.mode & ATTR_INVISIBLE)
 		fg = bg;
 
+	if (invertcolors) {
+		revfg = invertedcolor(fg);
+		revbg = invertedcolor(bg);
+		fg = &revfg;
+		bg = &revbg;
+	}
+
 	/* Intelligent cleaning up of the borders. */
 	if (x == 0) {
 		xclear(0, (y == 0)? 0 : winy, win.vborderpx,