/**
 * gcc `pkg-config --cflags gtk+-2.0` fontmetrics.c `pkg-config --libs gtk+-2.0` -o fontmetrics
 */

#include <stdio.h>
#include <pango/pango.h>
#include <gtk/gtk.h>

int main( int argc, char **argv )
{
    GtkWidget *window, *label;
    PangoContext *context;
    PangoLanguage *lang;
    PangoFontMetrics *metrics;
    PangoFontDescription *font;

    gtk_init (&argc, &argv);
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    label = gtk_label_new ("hi there");
    gtk_container_add (GTK_CONTAINER (window), label);
    gtk_widget_show_all (window);
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (gtk_main_quit), 0);

    context = gtk_widget_get_pango_context (label);
    lang = pango_context_get_language (context);
    font = pango_font_description_copy (gtk_widget_get_style (window)->font_desc);
    metrics = pango_context_get_metrics (context, font, lang);

    fprintf (stderr, "Font: %s\n", pango_font_description_get_family (font));
    fprintf (stderr, "Size: %d\n", pango_font_description_get_size (font));
    fprintf (stderr, "Size (pixels): %d\n", PANGO_PIXELS (pango_font_description_get_size (font)));
    fprintf (stderr, "Approximate char width: %d\n",
             pango_font_metrics_get_approximate_char_width (metrics));
    fprintf (stderr, "Approximate digit width: %d\n",
             pango_font_metrics_get_approximate_digit_width (metrics));
    fprintf (stderr, "Approximate char width (pixels): %d\n",
             PANGO_PIXELS (pango_font_metrics_get_approximate_char_width (metrics)));
    fprintf (stderr, "Approximate digit width (pixels): %d\n",
             PANGO_PIXELS (pango_font_metrics_get_approximate_digit_width (metrics)));

    return 0;
}