if(filtype == variavel png){
    surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
    cr = cairo_create(surface);
}
else if(filetype == variavel pdf){
    surface = cairo_pdf_surface_create("pdffile.pdf", width, height);
    cr = cairo_create(surface);
}
Else{
    printf("Filetype Invalid!")
}