Enum lodepng::ffi::FilterStrategy [-] [+] [src]

pub enum FilterStrategy {
    LFS_ZERO,
    LFS_MINSUM,
    LFS_ENTROPY,
    LFS_BRUTE_FORCE,
    LFS_PREDEFINED,
}

automatically use color type with less bits per pixel if losslessly possible. Default: AUTO

Variants

`LFS_ZERO`	every filter at zero
`LFS_MINSUM`	Use filter that gives minumum sum, as described in the official PNG filter heuristic.
`LFS_ENTROPY`	Use the filter type that gives smallest Shannon entropy for this scanline. Depending on the image, this is better or worse than minsum.
`LFS_BRUTE_FORCE`	Brute-force-search PNG filters by compressing each filter for each scanline. Experimental, very slow, and only rarely gives better compression than MINSUM.
`LFS_PREDEFINED`	use predefined_filters buffer: you specify the filter type for each scanline