Function webp_dev::sys::webp::webp_picture_argb_to_yuva_dithered

pub unsafe fn webp_picture_argb_to_yuva_dithered(
    picture: *mut WebPPicture, 
    colorspace: WebPEncCSP, 
    dithering: f32
) -> c_int

Same as WebPPictureARGBToYUVA(), but the conversion is done using pseudo-random dithering with a strength 'dithering' between 0.0 (no dithering) and 1.0 (maximum dithering).

This is useful for photographic picture.