/**
 * original code: http://ubuntuforums.org/archive/index.php/t-2120175.html
 */


/* Build using
gcc <filename> $(pkg-config --cflags --libs pangocairo) -o <output_filename>
*/

#include <pango/pangocairo.h>

#define WIDTH 1000
#define HEIGHT 300
#define TEXT_SIZE 13

static PangoRectangle draw_text (cairo_t *cr, char *font_desc, char *text)
{
    PangoContext *pc;
    PangoLayout *layout;
    PangoFontDescription *desc;
    int i;
    cairo_font_options_t *fo;
    PangoRectangle pr;

    pc = pango_cairo_create_context(cr);
    fo = cairo_font_options_create();

    cairo_font_options_set_antialias(fo, CAIRO_ANTIALIAS_SUBPIXEL);
    cairo_font_options_set_subpixel_order(fo, CAIRO_SUBPIXEL_ORDER_RGB);
    cairo_font_options_set_hint_style(fo, CAIRO_HINT_STYLE_SLIGHT);

    pango_cairo_context_set_font_options(pc, fo);

    layout = pango_cairo_create_layout (cr);

    layout = pango_layout_new(pc);
    pango_layout_set_text (layout, text, -1);
    desc = pango_font_description_from_string (font_desc);
    pango_layout_set_font_description (layout, desc);
    pango_font_description_free (desc);

    pango_cairo_update_layout (cr, layout);
    pango_cairo_show_layout (cr, layout);

    pango_layout_get_extents(layout, &pr, NULL);
    pango_extents_to_pixels(&pr, NULL);
    printf("x: %i, y: %i, width: %i, height: %i\n", pr.x, pr.y, pr.width, pr.height);

    /* free the layout object */
    g_object_unref (layout);

    return pr;
}

int main (int argc, char *argv[])
{
    cairo_surface_t *cr_surface;
    cairo_t *cr;
    PangoRectangle pr;

    char text[] = "DejaVu Sans Regular 10\nThe quick brown fox jumps over the lazy dog\nConfiguration";
    char output_filename[] = "image.png";

    cr_surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1000, 300);
    cr = cairo_create (cr_surface);

    cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
    cairo_rectangle(cr, 0, 0, WIDTH, HEIGHT);
    cairo_fill(cr);

    cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);

    unsigned int i, ypos = 0;
    char font[32] = "DejaVu Sans Regular 10";
    draw_text(cr, font, text);

    cairo_surface_write_to_png (cr_surface, output_filename);
    cairo_surface_destroy (cr_surface);
    return 0;
}