1 ! Copyright (C) 2009 Kobi Lurie.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays colors combinators
4 combinators.short-circuit fry grouping images images.bitmap
5 images.loader images.normalization kernel locals math sequences ;
6 IN: images.processing.rotation
8 ERROR: unsupported-rotation degrees ;
12 : rotate-90 ( seq^3 -- seq^3 ) flip [ reverse ] map ;
13 : rotate-180 ( seq^3 -- seq^3 ) reverse [ reverse ] map ;
14 : rotate-270 ( seq^3 -- seq^3 ) flip reverse ;
16 : (rotate) ( seq n -- seq' )
20 { 180 [ rotate-180 ] }
21 { 270 [ rotate-270 ] }
22 [ unsupported-rotation ]
25 : rows-remove-pad ( byte-rows -- pixels' )
26 [ dup length 4 mod head* ] map ;
28 : row-length ( image -- n )
29 [ bitmap>> length ] [ dim>> second ] bi /i ;
31 : image>byte-rows ( image -- byte-rows )
32 [ bitmap>> ] [ row-length ] bi group rows-remove-pad ;
34 : (seperate-to-pixels) ( byte-rows image -- pixel-rows )
35 component-order>> bytes-per-pixel '[ _ group ] map ;
37 : image>pixel-rows ( image -- pixel-rows )
38 [ image>byte-rows ] keep (seperate-to-pixels) ;
40 : flatten-table ( seq^3 -- seq )
41 [ concat ] map concat ;
43 : ?reverse-dimensions ( image n -- )
44 { 270 90 } member? [ [ reverse ] change-dim ] when drop ;
46 : normalize-degree ( n -- n' ) 360 rem ;
48 : processing-effect ( image quot -- image' )
49 '[ image>pixel-rows @ flatten-table ] [ bitmap<< ] [ ] tri ; inline
51 :: rotate' ( image n -- image )
52 n normalize-degree :> n'
53 image image>pixel-rows :> pixel-table
54 image n' ?reverse-dimensions
55 pixel-table n' (rotate) :> table-rotated
56 image table-rotated flatten-table >>bitmap ;
60 : rotate ( image n -- image' )
62 [ '[ _ (rotate) ] processing-effect ] [ ?reverse-dimensions ] 2bi ;
64 : reflect-y-axis ( image -- image )
65 [ [ reverse ] map ] processing-effect ;
67 : reflect-x-axis ( image -- image )
68 [ reverse ] processing-effect ;