69 lines
2.0 KiB
Factor
69 lines
2.0 KiB
Factor
! Copyright (C) 2009 Kobi Lurie.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors arrays colors combinators
|
|
combinators.short-circuit fry grouping images images.bitmap
|
|
images.loader images.normalization kernel locals math sequences ;
|
|
IN: images.processing.rotation
|
|
|
|
ERROR: unsupported-rotation degrees ;
|
|
|
|
<PRIVATE
|
|
|
|
: rotate-90 ( seq^3 -- seq^3 ) flip [ reverse ] map ;
|
|
: rotate-180 ( seq^3 -- seq^3 ) reverse [ reverse ] map ;
|
|
: rotate-270 ( seq^3 -- seq^3 ) flip reverse ;
|
|
|
|
: (rotate) ( seq n -- seq' )
|
|
{
|
|
{ 0 [ ] }
|
|
{ 90 [ rotate-90 ] }
|
|
{ 180 [ rotate-180 ] }
|
|
{ 270 [ rotate-270 ] }
|
|
[ unsupported-rotation ]
|
|
} case ;
|
|
|
|
: rows-remove-pad ( byte-rows -- pixels' )
|
|
[ dup length 4 mod head* ] map ;
|
|
|
|
: row-length ( image -- n )
|
|
[ bitmap>> length ] [ dim>> second ] bi /i ;
|
|
|
|
: image>byte-rows ( image -- byte-rows )
|
|
[ bitmap>> ] [ row-length ] bi group rows-remove-pad ;
|
|
|
|
: (seperate-to-pixels) ( byte-rows image -- pixel-rows )
|
|
component-order>> bytes-per-pixel '[ _ group ] map ;
|
|
|
|
: image>pixel-rows ( image -- pixel-rows )
|
|
[ image>byte-rows ] keep (seperate-to-pixels) ;
|
|
|
|
: flatten-table ( seq^3 -- seq )
|
|
[ concat ] map concat ;
|
|
|
|
: ?reverse-dimensions ( image n -- )
|
|
{ 270 90 } member? [ [ reverse ] change-dim ] when drop ;
|
|
|
|
: normalize-degree ( n -- n' ) 360 rem ;
|
|
|
|
: processing-effect ( image quot -- image' )
|
|
'[ image>pixel-rows @ flatten-table ] [ (>>bitmap) ] [ ] tri ; inline
|
|
|
|
:: rotate' ( image n -- image )
|
|
n normalize-degree :> n'
|
|
image image>pixel-rows :> pixel-table
|
|
image n' ?reverse-dimensions
|
|
pixel-table n' (rotate) :> table-rotated
|
|
image table-rotated flatten-table >>bitmap ;
|
|
|
|
PRIVATE>
|
|
|
|
: rotate ( image n -- image' )
|
|
normalize-degree
|
|
[ '[ _ (rotate) ] processing-effect ] [ ?reverse-dimensions ] 2bi ;
|
|
|
|
: reflect-y-axis ( image -- image )
|
|
[ [ reverse ] map ] processing-effect ;
|
|
|
|
: reflect-x-axis ( image -- image )
|
|
[ reverse ] processing-effect ;
|