#include <cairo.h>

static cairo_status_t
render_glyph (cairo_scaled_font_t  *scaled_font,
              unsigned long         glyph,
              cairo_t              *cr,
              cairo_text_extents_t *metrics)
{
    cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_A8, 10, 10);
    cairo_surface_mark_dirty (surface);
    cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);

    cairo_save (cr);
    cairo_mask (cr, pattern);
    cairo_restore (cr);

    cairo_pattern_destroy (pattern);
    cairo_surface_destroy (surface);
    return CAIRO_STATUS_SUCCESS;
}

int
main (int argc, char *argv[])
{
    cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 100, 100);
    cairo_t *cr = cairo_create (surface);

    cairo_font_face_t *font_face = cairo_user_font_face_create ();
    cairo_user_font_face_set_render_glyph_func (font_face, render_glyph);
    cairo_set_font_face (cr, font_face);

    cairo_glyph_t glyphs[1] = {{0, 0, 0}};
    cairo_glyph_path (cr, glyphs, 1);
    return 0;
}