Base rc.title_height on font vertical extents

src/common/font.c

@@ -0,0 +1,41 @@
+#include <cairo.h>
+#include <pango/pangocairo.h>
+
+#include "common/font.h"
+
+static PangoRectangle font_extents(const char *font_description,
+				   const char *string)
+{
+	PangoRectangle rect;
+	cairo_surface_t *surface;
+	cairo_t *c;
+	PangoLayout *layout;
+	PangoFontDescription *font;
+
+	surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1);
+	c = cairo_create(surface);
+	layout = pango_cairo_create_layout(c);
+	font = pango_font_description_from_string(font_description);
+
+	pango_layout_set_font_description(layout, font);
+	pango_layout_set_text(layout, string, -1);
+	pango_layout_set_single_paragraph_mode(layout, TRUE);
+	pango_layout_set_width(layout, -1);
+	pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_MIDDLE);
+	pango_layout_get_extents(layout, NULL, &rect);
+	pango_extents_to_pixels(&rect, NULL);
+
+	/* we put a 2 px edge on each side - because Openbox does it :) */
+	rect.width += 4;
+
+	g_object_unref(layout);
+	pango_font_description_free(font);
+	return rect;
+}
+
+int font_height(const char *font_description)
+{
+	PangoRectangle rectangle;
+	rectangle = font_extents(font_description, "abcdefg");
+	return rectangle.height;
+}

src/common/meson.build

@@ -1,4 +1,5 @@
 labwc_sources += files(
   'buf.c',
+  'font.c',
   'spawn.c',
 )