int gfx_render_png (gfx_canvas_t *canvas,
art_u32 width, art_u32 height,
gfx_color_t background, FILE *fo);
double gfx_get_text_width_libart ( gfx_canvas_t *canvas,
double start, char* font, double size,
int gfx_render_png (gfx_canvas_t *canvas,
art_u32 width, art_u32 height,
gfx_color_t background, FILE *fo);
double gfx_get_text_width_libart ( gfx_canvas_t *canvas,
double start, char* font, double size,