Function webp_dev::sys::webp::webp_picture_distortion

pub unsafe fn webp_picture_distortion(
    src: *const WebPPicture, 
    ref_: *const WebPPicture, 
    metric_type: c_int, 
    result: *mut f32
) -> c_int

Compute PSNR, SSIM or LSIM distortion metric between two pictures.

Results are in dB, stored in result[] in the B/G/R/A/All order. The distortion is always performed using ARGB samples. Hence if the input is YUV(A), the picture will be internally converted to ARGB (just for the measurement). Warning: this function is rather CPU-intensive.