flic 0.1.6

Autodesk Animator FLI and Autodesk Animator Pro FLC file encoder and decoder.
Documentation 
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//! Codec for chunk type 13 = FLI_BLACK.

use ::{Raster,RasterMut};

/// Magic for a FLI_BLACK chunk - No Data.
///
/// This chunk has no data following the header.  All pixels in the
/// frame are set to color index 0.
pub const FLI_BLACK: u16 = 13;

/// Decode a FLI_BLACK chunk.
pub fn decode_fli_black(dst: &mut RasterMut) {
    let start = dst.stride * dst.y;
    let end = dst.stride * (dst.y + dst.h);
    for row in dst.buf[start..end].chunks_mut(dst.stride) {
        let start = dst.x;
        let end = start + dst.w;
        for e in &mut row[start..end] {
            *e = 0;
        }
    }
}

/// True if the frame can be encoded by FLI_BLACK.
pub fn can_encode_fli_black(next: &Raster) -> bool {
    let start = next.stride * next.y;
    let end = next.stride * (next.y + next.h);
    next.buf[start..end].chunks(next.stride)
            .all(|row| row.iter().all(|&e| e == 0))
}