Merge font.c into xcb.c

src/xcb.c

@@ -19,6 +19,47 @@
 
 #include "util.h"
 
+TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
+
+/*
+ * Loads a font for usage, getting its height. This function is used very often, so it
+ * maintains a cache.
+ *
+ */
+i3Font *load_font(xcb_connection_t *connection, const char *pattern) {
+        /* Check if we got the font cached */
+        i3Font *font;
+        TAILQ_FOREACH(font, &cached_fonts, fonts)
+                if (strcmp(font->pattern, pattern) == 0)
+                        return font;
+
+        i3Font *new = smalloc(sizeof(i3Font));
+        xcb_void_cookie_t font_cookie;
+        xcb_list_fonts_with_info_cookie_t info_cookie;
+
+        /* Send all our requests first */
+        new->id = xcb_generate_id(connection);
+        font_cookie = xcb_open_font_checked(connection, new->id, strlen(pattern), pattern);
+        info_cookie = xcb_list_fonts_with_info(connection, 1, strlen(pattern), pattern);
+
+        check_error(connection, font_cookie, "Could not open font");
+
+        /* Get information (height/name) for this font */
+        xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(connection, info_cookie, NULL);
+        exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
+
+        if (asprintf(&(new->name), "%.*s", xcb_list_fonts_with_info_name_length(reply),
+                                           xcb_list_fonts_with_info_name(reply)) == -1)
+                die("asprintf() failed\n");
+        new->pattern = sstrdup(pattern);
+        new->height = reply->font_ascent + reply->font_descent;
+
+        /* Insert into cache */
+        TAILQ_INSERT_TAIL(&cached_fonts, new, fonts);
+
+        return new;
+}
+
 /*
  * Returns the colorpixel to use for the given hex color (think of HTML).
  *