From e493493fa3bffd8b58408a55714de9d49211b1ba Mon Sep 17 00:00:00 2001
From: Layerex <layerex@dismail.de>
Date: Fri, 23 Jul 2021 15:15:23 +0300
Subject: [PATCH] ratiofullscreen patch

Toggle fullscreen for a window while saving its ratio.
Space left uncovered by a window may be set to be black or left
transparent.
The patch is intended to be used with old games which have miniscule
window sizes and don't handle fullscreen correctly themselves.
Smartborders patch (its modified resizeclient function) is a dependency
of this patch.
---
 config.def.h |  3 +++
 dwm.c        | 60 ++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 59 insertions(+), 4 deletions(-)

diff --git a/config.def.h b/config.def.h
index 1c0b587..6966237 100644
--- a/config.def.h
+++ b/config.def.h
@@ -36,6 +36,8 @@ static const float mfact     = 0.55; /* factor of master area size [0.05..0.95]
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
 
+static const int ratiofullscreenborders = 1;
+
 static const Layout layouts[] = {
 	/* symbol     arrange function */
 	{ "[]=",      tile },    /* first entry is default */
@@ -61,6 +63,7 @@ static const char *termcmd[]  = { "st", NULL };
 
 static Key keys[] = {
 	/* modifier                     key        function        argument */
+	{ MODKEY|ControlMask,           XK_f,      toggleratiofullscr,  {0} },
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
diff --git a/dwm.c b/dwm.c
index 3c94e4b..7b19235 100644
--- a/dwm.c
+++ b/dwm.c
@@ -211,6 +211,7 @@ static void tagmon(const Arg *arg);
 static void tile(Monitor *);
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
+static void toggleratiofullscr(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
 static void unfocus(Client *c, int setfocus);
@@ -802,7 +803,9 @@ focus(Client *c)
 		detachstack(c);
 		attachstack(c);
 		grabbuttons(c, 1);
-		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
+		if (!c->isfullscreen) {
+			XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
+		}
 		setfocus(c);
 	} else {
 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
@@ -1482,10 +1485,49 @@ setfullscreen(Client *c, int fullscreen)
 	if (fullscreen && !c->isfullscreen) {
 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
-		c->isfullscreen = 1;
+		c->isfullscreen = fullscreen;
 		c->oldstate = c->isfloating;
+		c->oldbw = c->bw;
+		c->bw = 0;
 		c->isfloating = 1;
-		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh, 0);
+		int nx, ny, nw, nh, bw;
+		if (fullscreen == 1) {
+			nx = c->mon->mx;
+			ny = c->mon->my;
+			nw = c->mon->mw;
+			nh = c->mon->mh;
+			bw = 0;
+		} else if (fullscreen == 2) {
+			if ((nw = c->w * c->mon->mh / c->h) < c->mon->mw) {
+				nh = c->mon->mh;
+				nx = (c->mon->mw - nw) / 2;
+				if (!ratiofullscreenborders) {
+					ny = c->mon->my;
+					bw = 0;
+				} else {
+					ny = -nx;
+					bw = nx;
+					nx = 0;
+				}
+			} else {
+				nw = c->mon->mw;
+				nh = c->h * c->mon->mw / c->w;
+				ny = (c->mon->mh - nh) / 2;
+				if (!ratiofullscreenborders) {
+					nx = c->mon->mx;
+					bw = 0;
+				} else {
+					nx = -ny;
+					bw = ny;
+					ny = 0;
+				}
+			}
+			XSetWindowBorder(dpy, c->win, BlackPixel(dpy, screen));
+		} else {
+			printf("Invalid argument (%d) provided to setfullscreen", fullscreen);
+			return;
+		}
+		resizeclient(c, nx, ny, nw, nh, bw);
 		XRaiseWindow(dpy, c->win);
 	} else if (!fullscreen && c->isfullscreen){
 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
@@ -1498,6 +1540,7 @@ setfullscreen(Client *c, int fullscreen)
 		c->h = c->oldh;
 		c->bw = c->oldbw;
 		resizeclient(c, c->x, c->y, c->w, c->h, c->bw);
+		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 		arrange(c->mon);
 	}
 }
@@ -1730,6 +1773,13 @@ togglefloating(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+toggleratiofullscr(const Arg *arg)
+{
+  if(selmon->sel)
+    setfullscreen(selmon->sel, !selmon->sel->isfullscreen * 2);
+}
+
 void
 toggletag(const Arg *arg)
 {
@@ -1763,7 +1813,9 @@ unfocus(Client *c, int setfocus)
 	if (!c)
 		return;
 	grabbuttons(c, 0);
-	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
+	if (!c->isfullscreen) {
+		XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
+	}
 	if (setfocus) {
 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
-- 
2.32.0