float ideal_contents_scale,
float device_scale_factor,
float page_scale_factor,
float ideal_contents_scale,
float device_scale_factor,
float page_scale_factor,
// Don't scale images during rastering to ensure image quality, save memory
// and avoid frequent re-rastering on change of scale.
// Don't scale images during rastering to ensure image quality, save memory
// and avoid frequent re-rastering on change of scale.