Make statusbar optional (#95)

libXft and libfontconfig are now optional dependencies which can be
disabled via `HAVE_LIBFONTS=0`. Disabling them means disabling the
statusbar. This also does not search for freetype2 header if disabled.

Co-authored-by: NRK <nrk@disroot.org>

6 files changed, 63 insertions, 34 deletions

diff --git a/Makefile b/Makefile
index 45971dd..caf72f5 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,7 @@ OPT_DEP_DEFAULT ?= 1
 HAVE_INOTIFY ?= $(OPT_DEP_DEFAULT)
 
 # optional dependencies, see README for more info
+HAVE_LIBFONTS ?= $(OPT_DEP_DEFAULT)
 HAVE_LIBGIF ?= $(OPT_DEP_DEFAULT)
 HAVE_LIBEXIF ?= $(OPT_DEP_DEFAULT)
 HAVE_LIBWEBP ?= $(OPT_DEP_DEFAULT)
@@ -23,11 +24,16 @@ CFLAGS ?= -std=c99 -Wall -pedantic
 # icons that will be installed via `make icon`
 ICONS = 16x16.png 32x32.png 48x48.png 64x64.png 128x128.png
 
+inc_fonts_0 =
+inc_fonts_1 = -I/usr/include/freetype2 -I$(PREFIX)/include/freetype2
+
 CPPFLAGS = -D_XOPEN_SOURCE=700 \
   -DHAVE_LIBGIF=$(HAVE_LIBGIF) -DHAVE_LIBEXIF=$(HAVE_LIBEXIF) \
-  -DHAVE_LIBWEBP=$(HAVE_LIBWEBP) \
-  -I/usr/include/freetype2 -I$(PREFIX)/include/freetype2
+  -DHAVE_LIBWEBP=$(HAVE_LIBWEBP) -DHAVE_LIBFONTS=$(HAVE_LIBFONTS) \
+  $(inc_fonts_$(HAVE_LIBFONTS))
 
+lib_fonts_0 =
+lib_fonts_1 = -lXft -lfontconfig
 lib_exif_0 =
 lib_exif_1 = -lexif
 lib_gif_0 =
@@ -37,9 +43,9 @@ lib_webp_1 = -lwebpdemux -lwebp
 autoreload_0 = nop
 autoreload_1 = inotify
 # using += because certain *BSD distros may need to add additional flags
-LDLIBS += -lImlib2 -lX11 -lXft -lfontconfig \
+LDLIBS += -lImlib2 -lX11 \
   $(lib_exif_$(HAVE_LIBEXIF)) $(lib_gif_$(HAVE_LIBGIF)) \
-  $(lib_webp_$(HAVE_LIBWEBP))
+  $(lib_webp_$(HAVE_LIBWEBP)) $(lib_fonts_$(HAVE_LIBFONTS))
 
 OBJS = autoreload_$(autoreload_$(HAVE_INOTIFY)).o commands.o image.o main.o options.o \
   thumbs.o util.o window.o
diff --git a/README.md b/README.md
index 1c9d58f..3c97e5e 100644
--- a/README.md
+++ b/README.md
@@ -45,14 +45,13 @@ nsxiv requires the following software to be installed:
 
   * Imlib2
   * X11
-  * Xft
-  * freetype2
-  * fontconfig
 
 The following dependencies are optional.
 
   * inotify : Used for auto-reloading images on change.
     Disabled via `HAVE_INOTIFY=0`
+  * libXft, freetype2, fontconfig : Used for the status bar.
+    Disabled via `HAVE_LIBFONTS=0`
   * giflib : Used for animated gif playback.
     Disabled via `HAVE_LIBGIF=0`.
   * libexif : Used for auto-orientation and exif thumbnails.
diff --git a/image.c b/image.c
index 4fd1c36..43bd23c 100644
--- a/image.c
+++ b/image.c
@@ -643,7 +643,7 @@ void img_render(img_t *img)
 			}
 			imlib_image_put_back_data(data);
 		} else {
-			c = win->win_bg.pixel;
+			c = win->win_bg;
 			imlib_context_set_color(c >> 16 & 0xFF, c >> 8 & 0xFF, c & 0xFF, 0xFF);
 			imlib_image_fill_rectangle(0, 0, dw, dh);
 		}
diff --git a/nsxiv.h b/nsxiv.h
index c148b24..716b24d 100644
--- a/nsxiv.h
+++ b/nsxiv.h
@@ -383,7 +383,9 @@ int r_mkdir(char*);
 /* window.c */
 
 #include <X11/Xutil.h>
+#if HAVE_LIBFONTS
 #include <X11/Xft/Xft.h>
+#endif
 
 enum {
 	BAR_L_LEN = 512,
@@ -420,11 +422,13 @@ struct win {
 	Window xwin;
 	win_env_t env;
 
-	XftColor win_bg;
-	XftColor win_fg;
+	unsigned long win_bg;
+	unsigned long win_fg;
+	unsigned long mrk_fg;
+#if HAVE_LIBFONTS
 	XftColor bar_bg;
 	XftColor bar_fg;
-	XftColor mrk_fg;
+#endif
 
 	int x;
 	int y;
diff --git a/thumbs.c b/thumbs.c
index 40cd6bd..059ae95 100644
--- a/thumbs.c
+++ b/thumbs.c
@@ -471,14 +471,14 @@ void tns_mark(tns_t *tns, int n, bool mark)
 	if (n >= 0 && n < *tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
-		unsigned long col = win->win_bg.pixel;
+		unsigned long col = win->win_bg;
 		int x = t->x + t->w, y = t->y + t->h;
 
 		win_draw_rect(win, x - 1, y + 1, 1, tns->bw, true, 1, col);
 		win_draw_rect(win, x + 1, y - 1, tns->bw, 1, true, 1, col);
 
 		if (mark)
-			col = win->mrk_fg.pixel;
+			col = win->mrk_fg;
 
 		win_draw_rect(win, x, y, tns->bw + 2, tns->bw + 2, true, 1, col);
 
@@ -492,7 +492,7 @@ void tns_highlight(tns_t *tns, int n, bool hl)
 	if (n >= 0 && n < *tns->cnt && tns->thumbs[n].im != NULL) {
 		win_t *win = tns->win;
 		thumb_t *t = &tns->thumbs[n];
-		unsigned long col = hl ? win->win_fg.pixel : win->win_bg.pixel;
+		unsigned long col = hl ? win->win_fg : win->win_bg;
 		int oxy = (tns->bw + 1) / 2 + 1, owh = tns->bw + 2;
 
 		win_draw_rect(win, t->x - oxy, t->y - oxy, t->w + owh, t->h + owh,
diff --git a/window.c b/window.c
index a8597d3..5d33bfa 100644
--- a/window.c
+++ b/window.c
@@ -20,7 +20,6 @@
 #define _WINDOW_CONFIG
 #include "config.h"
 #include "icon/data.h"
-#include "utf8.h"
 
 #include <stdlib.h>
 #include <string.h>
@@ -30,6 +29,12 @@
 #include <X11/Xatom.h>
 #include <X11/Xresource.h>
 
+#if HAVE_LIBFONTS
+#include "utf8.h"
+static XftFont *font;
+static double fontsize;
+#endif
+
 #define RES_CLASS "Nsxiv"
 
 enum {
@@ -47,15 +52,14 @@ static struct {
 
 static GC gc;
 
-static XftFont *font;
-static int fontheight;
-static double fontsize;
 static int barheight;
 
 Atom atoms[ATOM_COUNT];
 
+#if HAVE_LIBFONTS
 void win_init_font(const win_env_t *e, const char *fontstr)
 {
+	int fontheight = 0;
 	if ((font = XftFontOpenName(e->dpy, e->scr, fontstr)) == NULL)
 		error(EXIT_FAILURE, 0, "Error loading font '%s'", fontstr);
 	fontheight = font->ascent + font->descent;
@@ -64,13 +68,19 @@ void win_init_font(const win_env_t *e, const char *fontstr)
 	XftFontClose(e->dpy, font);
 }
 
-void win_alloc_color(const win_env_t *e, const char *name, XftColor *col)
+void xft_alloc_color(const win_env_t *e, const char *name, XftColor *col)
 {
-	if (!XftColorAllocName(e->dpy, e->vis,
-	                       e->cmap, name, col))
-	{
+	if (!XftColorAllocName(e->dpy, e->vis, e->cmap, name, col))
 		error(EXIT_FAILURE, 0, "Error allocating color '%s'", name);
-	}
+}
+#endif /* HAVE_LIBFONTS */
+
+void win_alloc_color(const win_env_t *e, const char *name, unsigned long *pixel)
+{
+	XColor screen, exact;
+	if (!XAllocNamedColor(e->dpy, e->cmap, name, &screen, &exact))
+		error(EXIT_FAILURE, 0, "Error allocating color '%s'", name);
+	*pixel = exact.pixel;
 }
 
 const char* win_res(XrmDatabase db, const char *name, const char *def)
@@ -94,7 +104,10 @@ const char* win_res(XrmDatabase db, const char *name, const char *def)
 void win_init(win_t *win)
 {
 	win_env_t *e;
-	const char *win_bg, *win_fg, *bar_bg, *bar_fg, *mrk_fg, *f;
+	const char *win_bg, *win_fg, *mrk_fg;
+#if HAVE_LIBFONTS
+	const char *bar_fg, *bar_bg, *f;
+#endif
 	char *res_man;
 	XrmDatabase db;
 	XVisualInfo vis;
@@ -131,20 +144,22 @@ void win_init(win_t *win)
 	res_man = XResourceManagerString(e->dpy);
 	db = res_man != NULL ? XrmGetStringDatabase(res_man) : None;
 
-	f = win_res(db, RES_CLASS ".bar.font", "monospace-8");
-	win_init_font(e, f);
-
 	win_bg = win_res(db, RES_CLASS ".window.background", "white");
 	win_fg = win_res(db, RES_CLASS ".window.foreground", "black");
-	bar_bg = win_res(db, RES_CLASS ".bar.background", win_bg);
-	bar_fg = win_res(db, RES_CLASS ".bar.foreground", win_fg);
 	mrk_fg = win_res(db, RES_CLASS ".mark.foreground", win_fg);
 	win_alloc_color(e, win_bg, &win->win_bg);
 	win_alloc_color(e, win_fg, &win->win_fg);
-	win_alloc_color(e, bar_bg, &win->bar_bg);
-	win_alloc_color(e, bar_fg, &win->bar_fg);
 	win_alloc_color(e, mrk_fg, &win->mrk_fg);
 
+#if HAVE_LIBFONTS
+	bar_bg = win_res(db, RES_CLASS ".bar.background", win_bg);
+	bar_fg = win_res(db, RES_CLASS ".bar.foreground", win_fg);
+	xft_alloc_color(e, bar_bg, &win->bar_bg);
+	xft_alloc_color(e, bar_fg, &win->bar_fg);
+
+	f = win_res(db, RES_CLASS ".bar.font", "monospace-8");
+	win_init_font(e, f);
+
 	win->bar.l.size = BAR_L_LEN;
 	win->bar.r.size = BAR_R_LEN;
 	/* 3 padding bytes needed by utf8_decode */
@@ -153,6 +168,7 @@ void win_init(win_t *win)
 	win->bar.r.buf = emalloc(win->bar.r.size + 3);
 	win->bar.r.buf[0] = '\0';
 	win->bar.h = options->hide_bar ? 0 : barheight;
+#endif /* HAVE_LIBFONTS */
 
 	INIT_ATOM_(WM_DELETE_WINDOW);
 	INIT_ATOM_(_NET_WM_NAME);
@@ -306,7 +322,7 @@ void win_open(win_t *win)
 	win->buf.h = e->scrh;
 	win->buf.pm = XCreatePixmap(e->dpy, win->xwin,
 	                            win->buf.w, win->buf.h, e->depth);
-	XSetForeground(e->dpy, gc, win->win_bg.pixel);
+	XSetForeground(e->dpy, gc, win->win_bg);
 	XFillRectangle(e->dpy, win->buf.pm, gc, 0, 0, win->buf.w, win->buf.h);
 	XSetWindowBackgroundPixmap(e->dpy, win->xwin, win->buf.pm);
 
@@ -388,10 +404,11 @@ void win_clear(win_t *win)
 		win->buf.pm = XCreatePixmap(e->dpy, win->xwin,
 		                            win->buf.w, win->buf.h, e->depth);
 	}
-	XSetForeground(e->dpy, gc, win->win_bg.pixel);
+	XSetForeground(e->dpy, gc, win->win_bg);
 	XFillRectangle(e->dpy, win->buf.pm, gc, 0, 0, win->buf.w, win->buf.h);
 }
 
+#if HAVE_LIBFONTS
 #define TEXTWIDTH(win, text, len) \
 	win_draw_text(win, NULL, NULL, 0, 0, text, len, 0)
 
@@ -448,7 +465,7 @@ void win_draw_bar(win_t *win)
 	XSetForeground(e->dpy, gc, win->bar_bg.pixel);
 	XFillRectangle(e->dpy, win->buf.pm, gc, 0, win->h, win->w, win->bar.h);
 
-	XSetForeground(e->dpy, gc, win->win_bg.pixel);
+	XSetForeground(e->dpy, gc, win->win_bg);
 	XSetBackground(e->dpy, gc, win->bar_bg.pixel);
 
 	if ((len = strlen(r->buf)) > 0) {
@@ -465,6 +482,9 @@ void win_draw_bar(win_t *win)
 	}
 	XftDrawDestroy(d);
 }
+#else
+void win_draw_bar(win_t *win){}
+#endif /* HAVE_LIBFONTS */
 
 void win_draw(win_t *win)
 {