Font font_ttf = doc.font_load(fspec);
canvas.text_font(font_ttf);
canvas.text(50, 750, horse);
// control rect
canvas.rectangle(50, 200, 400, 450);
canvas.path_paint("s");
// justification
justified_text(font_ttf, canvas, 600);
justified_text(font_14, canvas, 550);
// expected errors