Paste: pnglitch

! Copyright © 2017 Alex Maestas.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors byte-arrays combinators.random fry grouping images
images.normalization images.png io.encodings.binary io.files kernel locals math
math.vectors random sequences sequences.deep sequences.rotated
tools.continuations ;
IN: pnglitch

CONSTANT: bpp 4

<PRIVATE
: pixelate ( bitmap -- bitmap' )
    B{ } flatten-as bpp <groups> ; inline
PRIVATE>

: <normal-image> ( -- image )
    <image>
    RGBA >>component-order
    ubyte-components >>component-type ;

: imbue ( bitmap dim -- image )
    <normal-image> -rot
    [ B{ } flatten-as >>bitmap ]
    [ >>dim ] bi* ;

: consume ( path -- normalized-image )
    binary <file-reader>
    load-png
    loading-png>image normalize-image ;

! explode with misalignment
:: explode* ( image offset -- bitmap dim )
    image bitmap>>
    offset [ <rotated> ] unless-zero
    pixelate
    image image-dim ;

: explode ( image -- bitmap dim )
    0 explode* ; inline

: row-clump ( bitmap dim -- bitmap' dim )
    [ first <circular-clumps> ] keep ;

: row-group ( bitmap dim -- bitmap' dim )
    [ first <groups> ] keep ;

: jitterbug ( bitmap dim -- bitmap dim )
    [ pixelate ] dip
    row-group
    [ first 4 / >integer
      '[ _ random <rotated> ] map ] keep ;