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