Add gaplessgrid patch

dwl.c

@@ -360,6 +360,9 @@ static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
 static void gpureset(struct wl_listener *listener, void *data);
+#if GAPLESSGRID_PATCH
+static void gaplessgrid(Monitor *m);
+#endif // GAPLESSGRID_PATCH
 #if UNCLUTTER_PATCH
 static void handlecursoractivity(void);
 static int hidecursor(void *data);
@@ -2048,6 +2051,58 @@ gpureset(struct wl_listener *listener, void *data)
 	wlr_renderer_destroy(old_drw);
 }
 
+#if GAPLESSGRID_PATCH
+void
+gaplessgrid(Monitor *m)
+{
+	unsigned int n = 0, i = 0, ch, cw, cn, rn, rows, cols;
+	Client *c;
+
+	wl_list_for_each(c, &clients, link)
+		if (VISIBLEON(c, m) && !c->isfloating)
+			n++;
+	if (n == 0)
+		return;
+
+	/* grid dimensions */
+	for (cols = 0; cols <= (n / 2); cols++)
+		if ((cols * cols) >= n)
+			break;
+
+	if (n == 5) /* set layout against the general calculation: not 1:2:2, but 2:3 */
+		cols = 2;
+
+	/* widescreen is better if 3 columns */
+	if (n >= 3 && n <= 6 && (m->w.width / m->w.height) > 1)
+		cols = 3;
+
+	rows = n / cols;
+
+	/* window geometries */
+	cw = cols ? m->w.width / cols : m->w.width;
+	cn = 0; /* current column number */
+	rn = 0; /* current row number */
+	wl_list_for_each(c, &clients, link) {
+		unsigned int cx, cy;
+		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
+			continue;
+
+		if ((i / rows + 1) > (cols - n % cols))
+			rows = n / cols + 1;
+		ch = rows ? m->w.height / rows : m->w.height;
+		cx = m->w.x + cn * cw;
+		cy = m->w.y + rn * ch;
+		resize(c, (struct wlr_box) { cx, cy, cw, ch}, 0);
+		rn++;
+		if (rn >= rows) {
+			rn = 0;
+			cn++;
+		}
+		i++;
+	}
+}
+#endif // GAPLESSGRID_PATCH
+
 void
 handlesig(int signo)
 {