/**
 * Test application to benchmark listing all fonts from pango.
 * gcc -o listpangofonts listpangofonts.c `pkg-config --cflags --libs gtk+-2.0`
 */
#include <stdio.h>
#include <sys/time.h>
#include <pango/pango.h>
#include <gtk/gtk.h>

/* Returns the difference between two timestamps in microseconds. */
static int timediff (struct timeval *large, struct timeval *small)
{
    return (   ( ( large->tv_sec * 1000 * 1000 ) + large->tv_usec )
             - ( ( small->tv_sec * 1000 * 1000 ) + small->tv_usec ) );
}

int main( int argc, char **argv )
{
    GtkWidget *window, *label;
    PangoFontFamily **families;
    struct timeval before;
    struct timeval after;
    int nfam, i, curtime;
    int total = 0;
    int nfonts = 0;

    /* Initialize GTK+ enough so we can get a pango context. */
    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);

    gettimeofday (&before, 0);
    pango_context_list_families (gtk_widget_get_pango_context (label),
        &families, &nfam);
    gettimeofday (&after, 0);
    curtime = timediff (&after, &before);
    total += curtime;

    fprintf (stderr, "%d families (%d us)\n", nfam, curtime);

    for (i = 0; i < nfam; i++) {
        PangoFontFace **faces;
        int nfaces, j;

        gettimeofday (&before, 0);
        pango_font_family_list_faces (families[i], &faces, &nfaces);
        gettimeofday (&after, 0);
        curtime = timediff (&after, &before);
        total += curtime;

        fprintf (stderr, "%s: %d faces (%d us)\n",
                 pango_font_family_get_name (families[i]), nfaces, curtime);

        for (j = 0; j < nfaces; j++ ) {
            PangoFontDescription *desc;

            gettimeofday (&before, 0);
            desc = pango_font_face_describe (faces[j]);
            gettimeofday (&after, 0);
            curtime = timediff (&after, &before);
            total += curtime;

            fprintf (stderr, "\t%s (%d us)\n",
                     pango_font_face_get_face_name (faces[j]), curtime);
            nfonts++;
            pango_font_description_free (desc);
        }

        g_free (faces);
    }
    g_free (families);
    fprintf (stderr, "list took %d ms in total on %d families (%d fonts)\n",
             total / 1000, nfam, nfonts);

    return 0;
}