Merge branch 'master' of git://factorcode.org/git/factor
Doug Coleman
commit
2adeecb9a4
basis
bitstreams
compression/inflate
images/jpeg
math/matrices
core/destructors
extra/nested-comments
|
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@ -56,13 +56,20 @@ TUPLE: lsb0-bit-writer < bit-writer ;
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GENERIC: peek ( n bitstream -- value )
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GENERIC: poke ( value n bitstream -- )
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: get-abp ( bitstream -- abp )
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[ byte-pos>> 8 * ] [ bit-pos>> + ] bi ; inline
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: set-abp ( abp bitstream -- )
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[ 8 /mod ] dip [ (>>bit-pos) ] [ (>>byte-pos) ] bi ; inline
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: seek ( n bitstream -- )
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{
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[ byte-pos>> 8 * ]
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[ bit-pos>> + + 8 /mod ]
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[ (>>bit-pos) ]
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[ (>>byte-pos) ]
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} cleave ; inline
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[ get-abp + ] [ set-abp ] bi ; inline
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: (align) ( n m -- n' )
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[ /mod 0 > [ 1+ ] when ] [ * ] bi ; inline
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: align ( n bitstream -- )
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[ get-abp swap (align) ] [ set-abp ] bi ; inline
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: read ( n bitstream -- value )
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[ peek ] [ seek ] 2bi ; inline
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@ -1,212 +1,220 @@
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! Copyright (C) 2009 Marc Fauconneau.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors arrays assocs byte-arrays
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byte-vectors combinators constructors fry grouping hashtables
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compression.huffman images io.binary kernel locals
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math math.bitwise math.order math.ranges multiline sequences
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sorting ;
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IN: compression.inflate
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QUALIFIED-WITH: bitstreams bs
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<PRIVATE
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: enum>seq ( assoc -- seq )
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dup keys [ ] [ max ] map-reduce 1 + f <array>
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[ '[ swap _ set-nth ] assoc-each ] keep ;
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ERROR: zlib-unimplemented ;
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ERROR: bad-zlib-data ;
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ERROR: bad-zlib-header ;
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:: check-zlib-header ( data -- )
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16 data bs:peek 2 >le be> 31 mod ! checksum
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0 assert=
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4 data bs:read 8 assert= ! compression method: deflate
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4 data bs:read ! log2(max length)-8, 32K max
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7 <= [ bad-zlib-header ] unless
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5 data bs:seek ! drop check bits
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1 data bs:read 0 assert= ! dictionnary - not allowed in png
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2 data bs:seek ! compression level; ignore
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;
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:: default-table ( -- table )
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0 <hashtable> :> table
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0 143 [a,b] 280 287 [a,b] append 8 table set-at
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144 255 [a,b] >array 9 table set-at
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256 279 [a,b] >array 7 table set-at
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table enum>seq 1 tail ;
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CONSTANT: clen-shuffle { 16 17 18 0 8 7 9 6 10 5 11 4 12 3 13 2 14 1 15 }
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: get-table ( values size -- table )
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16 f <array> clone <enum>
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[ '[ _ push-at ] 2each ] keep seq>> 1 tail [ natural-sort ] map ;
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:: decode-huffman-tables ( bitstream -- tables )
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5 bitstream bs:read 257 +
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5 bitstream bs:read 1 +
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4 bitstream bs:read 4 +
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clen-shuffle swap head
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dup [ drop 3 bitstream bs:read ] map
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get-table
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bitstream swap <huffman-decoder>
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[ 2dup + ] dip swap :> k!
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'[
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_ read1-huff2
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{
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{ [ dup 16 = ] [ 2 bitstream bs:read 3 + 2array ] }
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{ [ dup 17 = ] [ 3 bitstream bs:read 3 + 2array ] }
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{ [ dup 18 = ] [ 7 bitstream bs:read 11 + 2array ] }
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[ ]
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} cond
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dup array? [ dup second ] [ 1 ] if
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k swap - dup k! 0 >
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]
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[ ] produce swap suffix
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{ } [ dup array? [ dup first 16 = ] [ f ] if [ [ unclip-last ] [ second 1+ swap <repetition> append ] bi* ] [ suffix ] if ] reduce
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[ dup array? [ second 0 <repetition> ] [ 1array ] if ] map concat
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nip swap cut 2array [ [ length>> [0,b) ] [ ] bi get-table ] map ;
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CONSTANT: length-table
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{
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3 4 5 6 7 8 9 10
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11 13 15 17
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19 23 27 31
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35 43 51 59
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67 83 99 115
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131 163 195 227 258
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}
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CONSTANT: dist-table
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{
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1 2 3 4
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5 7 9 13
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17 25 33 49
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65 97 129 193
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257 385 513 769
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1025 1537 2049 3073
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4097 6145 8193 12289
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16385 24577
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}
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: nth* ( n seq -- elt )
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[ length 1- swap - ] [ nth ] bi ;
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:: inflate-lz77 ( seq -- bytes )
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1000 <byte-vector> :> bytes
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seq
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[
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dup array?
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[ first2 '[ _ 1- bytes nth* bytes push ] times ]
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[ bytes push ] if
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] each
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bytes ;
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:: inflate-dynamic ( bitstream -- bytes )
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bitstream decode-huffman-tables
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bitstream '[ _ swap <huffman-decoder> ] map :> tables
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[
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tables first read1-huff2
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dup 256 >
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[
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dup 285 =
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[ ]
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[
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dup 264 >
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[
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dup 261 - 4 /i dup 5 >
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[ bad-zlib-data ] when
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bitstream bs:read 2array
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]
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when
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] if
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! 5 bitstream read-bits ! distance
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tables second read1-huff2
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dup 3 >
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[
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dup 2 - 2 /i dup 13 >
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[ bad-zlib-data ] when
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bitstream bs:read 2array
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]
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when
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2array
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]
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when
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dup 256 = not
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]
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[ ] produce nip
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[
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dup array? [
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first2
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[
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dup array? [ first2 ] [ 0 ] if
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[ 257 - length-table nth ] [ + ] bi*
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]
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[
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dup array? [ first2 ] [ 0 ] if
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[ dist-table nth ] [ + ] bi*
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] bi*
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2array
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] when
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] map ;
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: inflate-raw ( bitstream -- bytes ) zlib-unimplemented ;
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: inflate-static ( bitstream -- bytes ) zlib-unimplemented ;
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:: inflate-loop ( bitstream -- bytes )
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[ 1 bitstream bs:read 0 = ]
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[
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bitstream
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2 bitstream bs:read
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{
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{ 0 [ inflate-raw ] }
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{ 1 [ inflate-static ] }
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{ 2 [ inflate-dynamic ] }
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{ 3 [ bad-zlib-data f ] }
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}
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case
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]
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[ produce ] keep call suffix concat ;
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! [ produce ] keep dip swap suffix
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:: paeth ( a b c -- p )
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a b + c - { a b c } [ [ - abs ] keep 2array ] with map
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sort-keys first second ;
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:: png-unfilter-line ( prev curr filter -- curr' )
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prev :> c
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prev 3 tail-slice :> b
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curr :> a
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curr 3 tail-slice :> x
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x length [0,b)
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filter
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{
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{ 0 [ drop ] }
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{ 1 [ [| n | n x nth n a nth + 256 wrap n x set-nth ] each ] }
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{ 2 [ [| n | n x nth n b nth + 256 wrap n x set-nth ] each ] }
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{ 3 [ [| n | n x nth n a nth n b nth + 2/ + 256 wrap n x set-nth ] each ] }
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{ 4 [ [| n | n x nth n a nth n b nth n c nth paeth + 256 wrap n x set-nth ] each ] }
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} case
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curr 3 tail ;
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PRIVATE>
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! for debug -- shows residual values
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: reverse-png-filter' ( lines -- byte-array )
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[ first ] [ 1 tail ] [ map ] bi-curry@ bi nip
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concat [ 128 + ] B{ } map-as ;
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||||
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: reverse-png-filter ( lines -- byte-array )
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dup first [ 0 ] replicate prefix
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[ { 0 0 } prepend ] map
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2 clump [
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first2 dup [ third ] [ 0 2 rot set-nth ] bi png-unfilter-line
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] map B{ } concat-as ;
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||||
: zlib-inflate ( bytes -- bytes )
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bs:<lsb0-bit-reader>
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[ check-zlib-header ] [ inflate-loop ] bi
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inflate-lz77 ;
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! Copyright (C) 2009 Marc Fauconneau.
|
||||
! See http://factorcode.org/license.txt for BSD license.
|
||||
USING: accessors arrays assocs byte-arrays
|
||||
byte-vectors combinators constructors fry grouping hashtables
|
||||
compression.huffman images io.binary kernel locals
|
||||
math math.bitwise math.order math.ranges multiline sequences
|
||||
sorting ;
|
||||
IN: compression.inflate
|
||||
|
||||
QUALIFIED-WITH: bitstreams bs
|
||||
|
||||
<PRIVATE
|
||||
|
||||
: enum>seq ( assoc -- seq )
|
||||
dup keys [ ] [ max ] map-reduce 1 + f <array>
|
||||
[ '[ swap _ set-nth ] assoc-each ] keep ;
|
||||
|
||||
ERROR: zlib-unimplemented ;
|
||||
ERROR: bad-zlib-data ;
|
||||
ERROR: bad-zlib-header ;
|
||||
|
||||
:: check-zlib-header ( data -- )
|
||||
16 data bs:peek 2 >le be> 31 mod ! checksum
|
||||
0 assert=
|
||||
4 data bs:read 8 assert= ! compression method: deflate
|
||||
4 data bs:read ! log2(max length)-8, 32K max
|
||||
7 <= [ bad-zlib-header ] unless
|
||||
5 data bs:seek ! drop check bits
|
||||
1 data bs:read 0 assert= ! dictionnary - not allowed in png
|
||||
2 data bs:seek ! compression level; ignore
|
||||
;
|
||||
|
||||
:: default-table ( -- table )
|
||||
0 <hashtable> :> table
|
||||
0 143 [a,b] 280 287 [a,b] append 8 table set-at
|
||||
144 255 [a,b] >array 9 table set-at
|
||||
256 279 [a,b] >array 7 table set-at
|
||||
table enum>seq 1 tail ;
|
||||
|
||||
CONSTANT: clen-shuffle { 16 17 18 0 8 7 9 6 10 5 11 4 12 3 13 2 14 1 15 }
|
||||
|
||||
: get-table ( values size -- table )
|
||||
16 f <array> clone <enum>
|
||||
[ '[ _ push-at ] 2each ] keep seq>> 1 tail [ natural-sort ] map ;
|
||||
|
||||
:: decode-huffman-tables ( bitstream -- tables )
|
||||
5 bitstream bs:read 257 +
|
||||
5 bitstream bs:read 1 +
|
||||
4 bitstream bs:read 4 +
|
||||
clen-shuffle swap head
|
||||
dup [ drop 3 bitstream bs:read ] map
|
||||
get-table
|
||||
bitstream swap <huffman-decoder>
|
||||
[ 2dup + ] dip swap :> k!
|
||||
'[
|
||||
_ read1-huff2
|
||||
{
|
||||
{ [ dup 16 = ] [ 2 bitstream bs:read 3 + 2array ] }
|
||||
{ [ dup 17 = ] [ 3 bitstream bs:read 3 + 2array ] }
|
||||
{ [ dup 18 = ] [ 7 bitstream bs:read 11 + 2array ] }
|
||||
[ ]
|
||||
} cond
|
||||
dup array? [ dup second ] [ 1 ] if
|
||||
k swap - dup k! 0 >
|
||||
]
|
||||
[ ] produce swap suffix
|
||||
{ } [ dup array? [ dup first 16 = ] [ f ] if [ [ unclip-last ] [ second 1+ swap <repetition> append ] bi* ] [ suffix ] if ] reduce
|
||||
[ dup array? [ second 0 <repetition> ] [ 1array ] if ] map concat
|
||||
nip swap cut 2array [ [ length>> [0,b) ] [ ] bi get-table ] map ;
|
||||
|
||||
CONSTANT: length-table
|
||||
{
|
||||
3 4 5 6 7 8 9 10
|
||||
11 13 15 17
|
||||
19 23 27 31
|
||||
35 43 51 59
|
||||
67 83 99 115
|
||||
131 163 195 227 258
|
||||
}
|
||||
|
||||
CONSTANT: dist-table
|
||||
{
|
||||
1 2 3 4
|
||||
5 7 9 13
|
||||
17 25 33 49
|
||||
65 97 129 193
|
||||
257 385 513 769
|
||||
1025 1537 2049 3073
|
||||
4097 6145 8193 12289
|
||||
16385 24577
|
||||
}
|
||||
|
||||
: nth* ( n seq -- elt )
|
||||
[ length 1- swap - ] [ nth ] bi ;
|
||||
|
||||
:: inflate-lz77 ( seq -- bytes )
|
||||
1000 <byte-vector> :> bytes
|
||||
seq
|
||||
[
|
||||
dup array?
|
||||
[ first2 '[ _ 1- bytes nth* bytes push ] times ]
|
||||
[ bytes push ] if
|
||||
] each
|
||||
bytes ;
|
||||
|
||||
:: inflate-dynamic ( bitstream -- bytes )
|
||||
bitstream decode-huffman-tables
|
||||
bitstream '[ _ swap <huffman-decoder> ] map :> tables
|
||||
[
|
||||
tables first read1-huff2
|
||||
dup 256 >
|
||||
[
|
||||
dup 285 =
|
||||
[ ]
|
||||
[
|
||||
dup 264 >
|
||||
[
|
||||
dup 261 - 4 /i dup 5 >
|
||||
[ bad-zlib-data ] when
|
||||
bitstream bs:read 2array
|
||||
]
|
||||
when
|
||||
] if
|
||||
! 5 bitstream read-bits ! distance
|
||||
tables second read1-huff2
|
||||
dup 3 >
|
||||
[
|
||||
dup 2 - 2 /i dup 13 >
|
||||
[ bad-zlib-data ] when
|
||||
bitstream bs:read 2array
|
||||
]
|
||||
when
|
||||
2array
|
||||
]
|
||||
when
|
||||
dup 256 = not
|
||||
]
|
||||
[ ] produce nip
|
||||
[
|
||||
dup array? [
|
||||
first2
|
||||
[
|
||||
dup array? [ first2 ] [ 0 ] if
|
||||
[ 257 - length-table nth ] [ + ] bi*
|
||||
]
|
||||
[
|
||||
dup array? [ first2 ] [ 0 ] if
|
||||
[ dist-table nth ] [ + ] bi*
|
||||
] bi*
|
||||
2array
|
||||
] when
|
||||
] map ;
|
||||
|
||||
:: inflate-raw ( bitstream -- bytes )
|
||||
8 bitstream bs:align
|
||||
16 bitstream bs:read :> len
|
||||
16 bitstream bs:read :> nlen
|
||||
len nlen + 16 >signed -1 assert= ! len + ~len = -1
|
||||
bitstream byte-pos>>
|
||||
bitstream byte-pos>> len +
|
||||
bitstream bytes>> <slice>
|
||||
len 8 * bitstream bs:seek ;
|
||||
|
||||
: inflate-static ( bitstream -- bytes ) zlib-unimplemented ;
|
||||
|
||||
:: inflate-loop ( bitstream -- bytes )
|
||||
[ 1 bitstream bs:read 0 = ]
|
||||
[
|
||||
bitstream
|
||||
2 bitstream bs:read
|
||||
{
|
||||
{ 0 [ inflate-raw ] }
|
||||
{ 1 [ inflate-static ] }
|
||||
{ 2 [ inflate-dynamic ] }
|
||||
{ 3 [ bad-zlib-data f ] }
|
||||
}
|
||||
case
|
||||
]
|
||||
[ produce ] keep call suffix concat ;
|
||||
|
||||
! [ produce ] keep dip swap suffix
|
||||
|
||||
:: paeth ( a b c -- p )
|
||||
a b + c - { a b c } [ [ - abs ] keep 2array ] with map
|
||||
sort-keys first second ;
|
||||
|
||||
:: png-unfilter-line ( prev curr filter -- curr' )
|
||||
prev :> c
|
||||
prev 3 tail-slice :> b
|
||||
curr :> a
|
||||
curr 3 tail-slice :> x
|
||||
x length [0,b)
|
||||
filter
|
||||
{
|
||||
{ 0 [ drop ] }
|
||||
{ 1 [ [| n | n x nth n a nth + 256 wrap n x set-nth ] each ] }
|
||||
{ 2 [ [| n | n x nth n b nth + 256 wrap n x set-nth ] each ] }
|
||||
{ 3 [ [| n | n x nth n a nth n b nth + 2/ + 256 wrap n x set-nth ] each ] }
|
||||
{ 4 [ [| n | n x nth n a nth n b nth n c nth paeth + 256 wrap n x set-nth ] each ] }
|
||||
|
||||
} case
|
||||
curr 3 tail ;
|
||||
|
||||
PRIVATE>
|
||||
|
||||
: reverse-png-filter' ( lines -- byte-array )
|
||||
[ first ] [ 1 tail ] [ map ] bi-curry@ bi nip
|
||||
concat [ 128 + ] B{ } map-as ;
|
||||
|
||||
: reverse-png-filter ( lines -- byte-array )
|
||||
dup first [ 0 ] replicate prefix
|
||||
[ { 0 0 } prepend ] map
|
||||
2 clump [
|
||||
first2 dup [ third ] [ 0 2 rot set-nth ] bi png-unfilter-line
|
||||
] map B{ } concat-as ;
|
||||
|
||||
: zlib-inflate ( bytes -- bytes )
|
||||
bs:<lsb0-bit-reader>
|
||||
[ check-zlib-header ] [ inflate-loop ] bi
|
||||
inflate-lz77 ;
|
||||
|
|
|
|||
|
|
@ -1,306 +1,359 @@
|
|||
! Copyright (C) 2009 Marc Fauconneau.
|
||||
! See http://factorcode.org/license.txt for BSD license.
|
||||
USING: accessors arrays byte-arrays combinators
|
||||
constructors grouping compression.huffman images
|
||||
images.processing io io.binary io.encodings.binary io.files
|
||||
io.streams.byte-array kernel locals math math.bitwise
|
||||
math.constants math.functions math.matrices math.order
|
||||
math.ranges math.vectors memoize multiline namespaces
|
||||
sequences sequences.deep images.loader ;
|
||||
QUALIFIED-WITH: bitstreams bs
|
||||
IN: images.jpeg
|
||||
|
||||
SINGLETON: jpeg-image
|
||||
{ "jpg" "jpeg" } [ jpeg-image register-image-class ] each
|
||||
|
||||
TUPLE: loading-jpeg < image
|
||||
{ headers }
|
||||
{ bitstream }
|
||||
{ color-info initial: { f f f f } }
|
||||
{ quant-tables initial: { f f } }
|
||||
{ huff-tables initial: { f f f f } }
|
||||
{ components } ;
|
||||
|
||||
<PRIVATE
|
||||
|
||||
CONSTRUCTOR: loading-jpeg ( headers bitstream -- image ) ;
|
||||
|
||||
SINGLETONS: SOF DHT DAC RST SOI EOI SOS DQT DNL DRI DHP EXP
|
||||
APP JPG COM TEM RES ;
|
||||
|
||||
! ISO/IEC 10918-1 Table B.1
|
||||
:: >marker ( byte -- marker )
|
||||
byte
|
||||
{
|
||||
{ [ dup HEX: CC = ] [ { DAC } ] }
|
||||
{ [ dup HEX: C4 = ] [ { DHT } ] }
|
||||
{ [ dup HEX: C9 = ] [ { JPG } ] }
|
||||
{ [ dup -4 shift HEX: C = ] [ SOF byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup HEX: D8 = ] [ { SOI } ] }
|
||||
{ [ dup HEX: D9 = ] [ { EOI } ] }
|
||||
{ [ dup HEX: DA = ] [ { SOS } ] }
|
||||
{ [ dup HEX: DB = ] [ { DQT } ] }
|
||||
{ [ dup HEX: DC = ] [ { DNL } ] }
|
||||
{ [ dup HEX: DD = ] [ { DRI } ] }
|
||||
{ [ dup HEX: DE = ] [ { DHP } ] }
|
||||
{ [ dup HEX: DF = ] [ { EXP } ] }
|
||||
{ [ dup -4 shift HEX: D = ] [ RST byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup -4 shift HEX: E = ] [ APP byte 4 bits 2array ] }
|
||||
{ [ dup HEX: FE = ] [ { COM } ] }
|
||||
{ [ dup -4 shift HEX: F = ] [ JPG byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup HEX: 01 = ] [ { TEM } ] }
|
||||
[ { RES } ]
|
||||
}
|
||||
cond nip ;
|
||||
|
||||
TUPLE: jpeg-chunk length type data ;
|
||||
|
||||
CONSTRUCTOR: jpeg-chunk ( type length data -- jpeg-chunk ) ;
|
||||
|
||||
TUPLE: jpeg-color-info
|
||||
h v quant-table dc-huff-table ac-huff-table { diff initial: 0 } id ;
|
||||
|
||||
CONSTRUCTOR: jpeg-color-info ( h v quant-table -- jpeg-color-info ) ;
|
||||
|
||||
: jpeg> ( -- jpeg-image ) loading-jpeg get ;
|
||||
|
||||
: apply-diff ( dc color -- dc' )
|
||||
[ diff>> + dup ] [ (>>diff) ] bi ;
|
||||
|
||||
: fetch-tables ( component -- )
|
||||
[ [ jpeg> quant-tables>> nth ] change-quant-table drop ]
|
||||
[ [ jpeg> huff-tables>> nth ] change-dc-huff-table drop ]
|
||||
[ [ 2 + jpeg> huff-tables>> nth ] change-ac-huff-table drop ] tri ;
|
||||
|
||||
: read4/4 ( -- a b ) read1 16 /mod ;
|
||||
|
||||
|
||||
! headers
|
||||
|
||||
: decode-frame ( header -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
read1 8 assert=
|
||||
2 read be>
|
||||
2 read be>
|
||||
swap 2array jpeg> (>>dim)
|
||||
read1
|
||||
[
|
||||
read1 read4/4 read1 <jpeg-color-info>
|
||||
swap [ >>id ] keep jpeg> color-info>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-quant-table ( chunk -- )
|
||||
dup data>>
|
||||
binary
|
||||
[
|
||||
length>>
|
||||
2 - 65 /
|
||||
[
|
||||
read4/4 [ 0 assert= ] dip
|
||||
64 read
|
||||
swap jpeg> quant-tables>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-huff-table ( chunk -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
1 ! %fixme: Should handle multiple tables at once
|
||||
[
|
||||
read4/4 swap 2 * +
|
||||
16 read
|
||||
dup [ ] [ + ] map-reduce read
|
||||
binary [ [ read [ B{ } ] unless* ] { } map-as ] with-byte-reader
|
||||
swap jpeg> huff-tables>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-scan ( chunk -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
read1 [0,b)
|
||||
[ drop
|
||||
read1 jpeg> color-info>> nth clone
|
||||
read1 16 /mod [ >>dc-huff-table ] [ >>ac-huff-table ] bi*
|
||||
] map jpeg> (>>components)
|
||||
read1 0 assert=
|
||||
read1 63 assert=
|
||||
read1 16 /mod [ 0 assert= ] bi@
|
||||
] with-byte-reader ;
|
||||
|
||||
: singleton-first ( seq -- elt )
|
||||
[ length 1 assert= ] [ first ] bi ;
|
||||
|
||||
: baseline-parse ( -- )
|
||||
jpeg> headers>>
|
||||
{
|
||||
[ [ type>> { SOF 0 } = ] filter singleton-first decode-frame ]
|
||||
[ [ type>> { DQT } = ] filter [ decode-quant-table ] each ]
|
||||
[ [ type>> { DHT } = ] filter [ decode-huff-table ] each ]
|
||||
[ [ type>> { SOS } = ] filter singleton-first decode-scan ]
|
||||
} cleave ;
|
||||
|
||||
: parse-marker ( -- marker )
|
||||
read1 HEX: FF assert=
|
||||
read1 >marker ;
|
||||
|
||||
: parse-headers ( -- chunks )
|
||||
[ parse-marker dup { SOS } = not ]
|
||||
[
|
||||
2 read be>
|
||||
dup 2 - read <jpeg-chunk>
|
||||
] [ produce ] keep dip swap suffix ;
|
||||
|
||||
MEMO: zig-zag ( -- zz )
|
||||
{
|
||||
{ 0 1 5 6 14 15 27 28 }
|
||||
{ 2 4 7 13 16 26 29 42 }
|
||||
{ 3 8 12 17 25 30 41 43 }
|
||||
{ 9 11 18 24 31 40 44 53 }
|
||||
{ 10 19 23 32 39 45 52 54 }
|
||||
{ 20 22 33 38 46 51 55 60 }
|
||||
{ 21 34 37 47 50 56 59 61 }
|
||||
{ 35 36 48 49 57 58 62 63 }
|
||||
} flatten ;
|
||||
|
||||
MEMO: yuv>bgr-matrix ( -- m )
|
||||
{
|
||||
{ 1 2.03211 0 }
|
||||
{ 1 -0.39465 -0.58060 }
|
||||
{ 1 0 1.13983 }
|
||||
} ;
|
||||
|
||||
: wave ( x u -- n ) swap 2 * 1 + * pi * 16 / cos ;
|
||||
|
||||
:: dct-vect ( u v -- basis )
|
||||
{ 8 8 } coord-matrix [ { u v } [ wave ] 2map product ] map^2
|
||||
1 u v [ 0 = [ 2 sqrt / ] when ] bi@ 4 / m*n ;
|
||||
|
||||
MEMO: dct-matrix ( -- m ) 64 [0,b) [ 8 /mod dct-vect flatten ] map ;
|
||||
|
||||
: mb-dim ( component -- dim ) [ h>> ] [ v>> ] bi 2array ;
|
||||
|
||||
: all-macroblocks ( quot: ( mb -- ) -- )
|
||||
[
|
||||
jpeg>
|
||||
[ dim>> 8 v/n ]
|
||||
[ color-info>> sift { 0 0 } [ mb-dim vmax ] reduce v/ ] bi
|
||||
[ ceiling ] map
|
||||
coord-matrix flip concat
|
||||
]
|
||||
[ each ] bi* ; inline
|
||||
|
||||
: reverse-zigzag ( b -- b' ) zig-zag swap [ nth ] curry map ;
|
||||
|
||||
: idct-factor ( b -- b' ) dct-matrix v.m ;
|
||||
|
||||
USE: math.blas.vectors
|
||||
USE: math.blas.matrices
|
||||
|
||||
MEMO: dct-matrix-blas ( -- m ) dct-matrix >float-blas-matrix ;
|
||||
: V.M ( x A -- x.A ) Mtranspose swap M.V ;
|
||||
: idct-blas ( b -- b' ) >float-blas-vector dct-matrix-blas V.M ;
|
||||
|
||||
: idct ( b -- b' ) idct-blas ;
|
||||
|
||||
:: draw-block ( block x,y color jpeg-image -- )
|
||||
block dup length>> sqrt >fixnum group flip
|
||||
dup matrix-dim coord-matrix flip
|
||||
[
|
||||
[ first2 spin nth nth ]
|
||||
[ x,y v+ color id>> 1- jpeg-image draw-color ] bi
|
||||
] with each^2 ;
|
||||
|
||||
: sign-extend ( bits v -- v' )
|
||||
swap [ ] [ 1- 2^ < ] 2bi
|
||||
[ -1 swap shift 1+ + ] [ drop ] if ;
|
||||
|
||||
: read1-jpeg-dc ( decoder -- dc )
|
||||
[ read1-huff dup ] [ bs>> bs:read ] bi sign-extend ;
|
||||
|
||||
: read1-jpeg-ac ( decoder -- run/ac )
|
||||
[ read1-huff 16 /mod dup ] [ bs>> bs:read ] bi sign-extend 2array ;
|
||||
|
||||
:: decode-block ( pos color -- )
|
||||
color dc-huff-table>> read1-jpeg-dc color apply-diff
|
||||
64 0 <array> :> coefs
|
||||
0 coefs set-nth
|
||||
0 :> k!
|
||||
[
|
||||
color ac-huff-table>> read1-jpeg-ac
|
||||
[ first 1+ k + k! ] [ second k coefs set-nth ] [ ] tri
|
||||
{ 0 0 } = not
|
||||
k 63 < and
|
||||
] loop
|
||||
coefs color quant-table>> v*
|
||||
reverse-zigzag idct
|
||||
! %fixme: color hack
|
||||
! this eat 50% cpu time
|
||||
color h>> 2 =
|
||||
[ 8 group 2 matrix-zoom concat ] unless
|
||||
pos { 8 8 } v* color jpeg> draw-block ;
|
||||
|
||||
: decode-macroblock ( mb -- )
|
||||
jpeg> components>>
|
||||
[
|
||||
[ mb-dim coord-matrix flip concat [ [ { 2 2 } v* ] [ v+ ] bi* ] with map ]
|
||||
[ [ decode-block ] curry each ] bi
|
||||
] with each ;
|
||||
|
||||
: cleanup-bitstream ( bytes -- bytes' )
|
||||
binary [
|
||||
[
|
||||
{ HEX: FF } read-until
|
||||
read1 tuck HEX: 00 = and
|
||||
]
|
||||
[ drop ] produce
|
||||
swap >marker { EOI } assert=
|
||||
swap suffix
|
||||
{ HEX: FF } join
|
||||
] with-byte-reader ;
|
||||
|
||||
: setup-bitmap ( image -- )
|
||||
dup dim>> 16 v/n [ ceiling ] map 16 v*n >>dim
|
||||
BGR >>component-order
|
||||
f >>upside-down?
|
||||
dup dim>> first2 * 3 * 0 <array> >>bitmap
|
||||
drop ;
|
||||
|
||||
: baseline-decompress ( -- )
|
||||
jpeg> bitstream>> cleanup-bitstream { 255 255 255 255 } append
|
||||
>byte-array bs:<msb0-bit-reader> jpeg> (>>bitstream)
|
||||
jpeg> [ bitstream>> ] [ [ [ <huffman-decoder> ] with map ] change-huff-tables drop ] bi
|
||||
jpeg> components>> [ fetch-tables ] each
|
||||
jpeg> setup-bitmap
|
||||
[ decode-macroblock ] all-macroblocks ;
|
||||
|
||||
! this eats ~25% cpu time
|
||||
: color-transform ( yuv -- rgb )
|
||||
{ 128 0 0 } v+ yuv>bgr-matrix swap m.v
|
||||
[ 0 max 255 min >fixnum ] map ;
|
||||
|
||||
PRIVATE>
|
||||
|
||||
: load-jpeg ( path -- image )
|
||||
binary [
|
||||
parse-marker { SOI } assert=
|
||||
parse-headers
|
||||
contents <loading-jpeg>
|
||||
] with-file-reader
|
||||
dup loading-jpeg [
|
||||
baseline-parse
|
||||
baseline-decompress
|
||||
jpeg> bitmap>> 3 <groups> [ color-transform ] change-each
|
||||
jpeg> [ >byte-array ] change-bitmap drop
|
||||
] with-variable ;
|
||||
|
||||
M: jpeg-image load-image* ( path jpeg-image -- bitmap )
|
||||
drop load-jpeg ;
|
||||
! Copyright (C) 2009 Marc Fauconneau.
|
||||
! See http://factorcode.org/license.txt for BSD license.
|
||||
USING: accessors arrays byte-arrays combinators
|
||||
constructors grouping compression.huffman images
|
||||
images.processing io io.binary io.encodings.binary io.files
|
||||
io.streams.byte-array kernel locals math math.bitwise
|
||||
math.constants math.functions math.matrices math.order
|
||||
math.ranges math.vectors memoize multiline namespaces
|
||||
sequences sequences.deep ;
|
||||
IN: images.jpeg
|
||||
|
||||
QUALIFIED-WITH: bitstreams bs
|
||||
|
||||
TUPLE: jpeg-image < image
|
||||
{ headers }
|
||||
{ bitstream }
|
||||
{ color-info initial: { f f f f } }
|
||||
{ quant-tables initial: { f f } }
|
||||
{ huff-tables initial: { f f f f } }
|
||||
{ components } ;
|
||||
|
||||
<PRIVATE
|
||||
|
||||
CONSTRUCTOR: jpeg-image ( headers bitstream -- image ) ;
|
||||
|
||||
SINGLETONS: SOF DHT DAC RST SOI EOI SOS DQT DNL DRI DHP EXP
|
||||
APP JPG COM TEM RES ;
|
||||
|
||||
! ISO/IEC 10918-1 Table B.1
|
||||
:: >marker ( byte -- marker )
|
||||
byte
|
||||
{
|
||||
{ [ dup HEX: CC = ] [ { DAC } ] }
|
||||
{ [ dup HEX: C4 = ] [ { DHT } ] }
|
||||
{ [ dup HEX: C9 = ] [ { JPG } ] }
|
||||
{ [ dup -4 shift HEX: C = ] [ SOF byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup HEX: D8 = ] [ { SOI } ] }
|
||||
{ [ dup HEX: D9 = ] [ { EOI } ] }
|
||||
{ [ dup HEX: DA = ] [ { SOS } ] }
|
||||
{ [ dup HEX: DB = ] [ { DQT } ] }
|
||||
{ [ dup HEX: DC = ] [ { DNL } ] }
|
||||
{ [ dup HEX: DD = ] [ { DRI } ] }
|
||||
{ [ dup HEX: DE = ] [ { DHP } ] }
|
||||
{ [ dup HEX: DF = ] [ { EXP } ] }
|
||||
{ [ dup -4 shift HEX: D = ] [ RST byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup -4 shift HEX: E = ] [ APP byte 4 bits 2array ] }
|
||||
{ [ dup HEX: FE = ] [ { COM } ] }
|
||||
{ [ dup -4 shift HEX: F = ] [ JPG byte 4 bits 2array ] }
|
||||
|
||||
{ [ dup HEX: 01 = ] [ { TEM } ] }
|
||||
[ { RES } ]
|
||||
}
|
||||
cond nip ;
|
||||
|
||||
TUPLE: jpeg-chunk length type data ;
|
||||
|
||||
CONSTRUCTOR: jpeg-chunk ( type length data -- jpeg-chunk ) ;
|
||||
|
||||
TUPLE: jpeg-color-info
|
||||
h v quant-table dc-huff-table ac-huff-table { diff initial: 0 } id ;
|
||||
|
||||
CONSTRUCTOR: jpeg-color-info ( h v quant-table -- jpeg-color-info ) ;
|
||||
|
||||
: jpeg> ( -- jpeg-image ) jpeg-image get ;
|
||||
|
||||
: apply-diff ( dc color -- dc' )
|
||||
[ diff>> + dup ] [ (>>diff) ] bi ;
|
||||
|
||||
: fetch-tables ( component -- )
|
||||
[ [ jpeg> quant-tables>> nth ] change-quant-table drop ]
|
||||
[ [ jpeg> huff-tables>> nth ] change-dc-huff-table drop ]
|
||||
[ [ 2 + jpeg> huff-tables>> nth ] change-ac-huff-table drop ] tri ;
|
||||
|
||||
: read4/4 ( -- a b ) read1 16 /mod ;
|
||||
|
||||
! headers
|
||||
|
||||
: decode-frame ( header -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
read1 8 assert=
|
||||
2 read be>
|
||||
2 read be>
|
||||
swap 2array jpeg> (>>dim)
|
||||
read1
|
||||
[
|
||||
read1 read4/4 read1 <jpeg-color-info>
|
||||
swap [ >>id ] keep jpeg> color-info>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-quant-table ( chunk -- )
|
||||
dup data>>
|
||||
binary
|
||||
[
|
||||
length>>
|
||||
2 - 65 /
|
||||
[
|
||||
read4/4 [ 0 assert= ] dip
|
||||
64 read
|
||||
swap jpeg> quant-tables>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-huff-table ( chunk -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
1 ! %fixme: Should handle multiple tables at once
|
||||
[
|
||||
read4/4 swap 2 * +
|
||||
16 read
|
||||
dup [ ] [ + ] map-reduce read
|
||||
binary [ [ read [ B{ } ] unless* ] { } map-as ] with-byte-reader
|
||||
swap jpeg> huff-tables>> set-nth
|
||||
] times
|
||||
] with-byte-reader ;
|
||||
|
||||
: decode-scan ( chunk -- )
|
||||
data>>
|
||||
binary
|
||||
[
|
||||
read1 [0,b)
|
||||
[ drop
|
||||
read1 jpeg> color-info>> nth clone
|
||||
read1 16 /mod [ >>dc-huff-table ] [ >>ac-huff-table ] bi*
|
||||
] map jpeg> (>>components)
|
||||
read1 0 assert=
|
||||
read1 63 assert=
|
||||
read1 16 /mod [ 0 assert= ] bi@
|
||||
] with-byte-reader ;
|
||||
|
||||
: singleton-first ( seq -- elt )
|
||||
[ length 1 assert= ] [ first ] bi ;
|
||||
|
||||
: baseline-parse ( -- )
|
||||
jpeg> headers>>
|
||||
{
|
||||
[ [ type>> { SOF 0 } = ] filter singleton-first decode-frame ]
|
||||
[ [ type>> { DQT } = ] filter [ decode-quant-table ] each ]
|
||||
[ [ type>> { DHT } = ] filter [ decode-huff-table ] each ]
|
||||
[ [ type>> { SOS } = ] filter singleton-first decode-scan ]
|
||||
} cleave ;
|
||||
|
||||
: parse-marker ( -- marker )
|
||||
read1 HEX: FF assert=
|
||||
read1 >marker ;
|
||||
|
||||
: parse-headers ( -- chunks )
|
||||
[ parse-marker dup { SOS } = not ]
|
||||
[
|
||||
2 read be>
|
||||
dup 2 - read <jpeg-chunk>
|
||||
] [ produce ] keep dip swap suffix ;
|
||||
|
||||
MEMO: zig-zag ( -- zz )
|
||||
{
|
||||
{ 0 1 5 6 14 15 27 28 }
|
||||
{ 2 4 7 13 16 26 29 42 }
|
||||
{ 3 8 12 17 25 30 41 43 }
|
||||
{ 9 11 18 24 31 40 44 53 }
|
||||
{ 10 19 23 32 39 45 52 54 }
|
||||
{ 20 22 33 38 46 51 55 60 }
|
||||
{ 21 34 37 47 50 56 59 61 }
|
||||
{ 35 36 48 49 57 58 62 63 }
|
||||
} flatten ;
|
||||
|
||||
MEMO: yuv>bgr-matrix ( -- m )
|
||||
{
|
||||
{ 1 2.03211 0 }
|
||||
{ 1 -0.39465 -0.58060 }
|
||||
{ 1 0 1.13983 }
|
||||
} ;
|
||||
|
||||
: wave ( x u -- n ) swap 2 * 1 + * pi * 16 / cos ;
|
||||
|
||||
:: dct-vect ( u v -- basis )
|
||||
{ 8 8 } coord-matrix [ { u v } [ wave ] 2map product ] map^2
|
||||
1 u v [ 0 = [ 2 sqrt / ] when ] bi@ 4 / m*n ;
|
||||
|
||||
MEMO: dct-matrix ( -- m ) 64 [0,b) [ 8 /mod dct-vect flatten ] map ;
|
||||
|
||||
: mb-dim ( component -- dim ) [ h>> ] [ v>> ] bi 2array ;
|
||||
|
||||
! : blocks ( component -- seq )
|
||||
! mb-dim ! coord-matrix flip concat [ [ { 2 2 } v* ] [ v+ ] bi* ] with map ;
|
||||
|
||||
: all-macroblocks ( quot: ( mb -- ) -- )
|
||||
[
|
||||
jpeg>
|
||||
[ dim>> 8 v/n ]
|
||||
[ color-info>> sift { 0 0 } [ mb-dim vmax ] reduce v/ ] bi
|
||||
[ ceiling ] map
|
||||
coord-matrix flip concat
|
||||
]
|
||||
[ each ] bi* ; inline
|
||||
|
||||
: reverse-zigzag ( b -- b' ) zig-zag swap [ nth ] curry map ;
|
||||
|
||||
: idct-factor ( b -- b' ) dct-matrix v.m ;
|
||||
|
||||
USE: math.blas.vectors
|
||||
USE: math.blas.matrices
|
||||
|
||||
MEMO: dct-matrix-blas ( -- m ) dct-matrix >float-blas-matrix ;
|
||||
: V.M ( x A -- x.A ) Mtranspose swap M.V ;
|
||||
: idct-blas ( b -- b' ) >float-blas-vector dct-matrix-blas V.M ;
|
||||
|
||||
: idct ( b -- b' ) idct-blas ;
|
||||
|
||||
:: draw-block ( block x,y color-id jpeg-image -- )
|
||||
block dup length>> sqrt >fixnum group flip
|
||||
dup matrix-dim coord-matrix flip
|
||||
[
|
||||
[ first2 spin nth nth ]
|
||||
[ x,y v+ color-id jpeg-image draw-color ] bi
|
||||
] with each^2 ;
|
||||
|
||||
: sign-extend ( bits v -- v' )
|
||||
swap [ ] [ 1- 2^ < ] 2bi
|
||||
[ -1 swap shift 1+ + ] [ drop ] if ;
|
||||
|
||||
: read1-jpeg-dc ( decoder -- dc )
|
||||
[ read1-huff dup ] [ bs>> bs:read ] bi sign-extend ;
|
||||
|
||||
: read1-jpeg-ac ( decoder -- run/ac )
|
||||
[ read1-huff 16 /mod dup ] [ bs>> bs:read ] bi sign-extend 2array ;
|
||||
|
||||
:: decode-block ( color -- pixels )
|
||||
color dc-huff-table>> read1-jpeg-dc color apply-diff
|
||||
64 0 <array> :> coefs
|
||||
0 coefs set-nth
|
||||
0 :> k!
|
||||
[
|
||||
color ac-huff-table>> read1-jpeg-ac
|
||||
[ first 1+ k + k! ] [ second k coefs set-nth ] [ ] tri
|
||||
{ 0 0 } = not
|
||||
k 63 < and
|
||||
] loop
|
||||
coefs color quant-table>> v*
|
||||
reverse-zigzag idct ;
|
||||
|
||||
:: draw-macroblock-yuv420 ( mb blocks -- )
|
||||
mb { 16 16 } v* :> pos
|
||||
0 blocks nth pos { 0 0 } v+ 0 jpeg> draw-block
|
||||
1 blocks nth pos { 8 0 } v+ 0 jpeg> draw-block
|
||||
2 blocks nth pos { 0 8 } v+ 0 jpeg> draw-block
|
||||
3 blocks nth pos { 8 8 } v+ 0 jpeg> draw-block
|
||||
4 blocks nth 8 group 2 matrix-zoom concat pos 1 jpeg> draw-block
|
||||
5 blocks nth 8 group 2 matrix-zoom concat pos 2 jpeg> draw-block ;
|
||||
|
||||
:: draw-macroblock-yuv444 ( mb blocks -- )
|
||||
mb { 8 8 } v* :> pos
|
||||
3 iota [ [ blocks nth pos ] [ jpeg> draw-block ] bi ] each ;
|
||||
|
||||
:: draw-macroblock-y ( mb blocks -- )
|
||||
mb { 8 8 } v* :> pos
|
||||
0 blocks nth pos 0 jpeg> draw-block
|
||||
64 0 <array> pos 1 jpeg> draw-block
|
||||
64 0 <array> pos 2 jpeg> draw-block ;
|
||||
|
||||
! %fixme: color hack
|
||||
! color h>> 2 =
|
||||
! [ 8 group 2 matrix-zoom concat ] unless
|
||||
! pos { 8 8 } v* color jpeg> draw-block ;
|
||||
|
||||
: decode-macroblock ( -- blocks )
|
||||
jpeg> components>>
|
||||
[
|
||||
[ mb-dim first2 * iota ]
|
||||
[ [ decode-block ] curry replicate ] bi
|
||||
] map concat ;
|
||||
|
||||
: cleanup-bitstream ( bytes -- bytes' )
|
||||
binary [
|
||||
[
|
||||
{ HEX: FF } read-until
|
||||
read1 tuck HEX: 00 = and
|
||||
]
|
||||
[ drop ] produce
|
||||
swap >marker { EOI } assert=
|
||||
swap suffix
|
||||
{ HEX: FF } join
|
||||
] with-byte-reader ;
|
||||
|
||||
: setup-bitmap ( image -- )
|
||||
dup dim>> 16 v/n [ ceiling ] map 16 v*n >>dim
|
||||
BGR >>component-order
|
||||
f >>upside-down?
|
||||
dup dim>> first2 * 3 * 0 <array> >>bitmap
|
||||
drop ;
|
||||
|
||||
ERROR: unsupported-colorspace ;
|
||||
SINGLETONS: YUV420 YUV444 Y MAGIC! ;
|
||||
|
||||
:: detect-colorspace ( jpeg-image -- csp )
|
||||
jpeg-image color-info>> sift :> colors
|
||||
MAGIC!
|
||||
colors length 1 = [ drop Y ] when
|
||||
colors length 3 =
|
||||
[
|
||||
colors [ mb-dim { 1 1 } = ] all?
|
||||
[ drop YUV444 ] when
|
||||
|
||||
colors unclip
|
||||
[ [ mb-dim { 1 1 } = ] all? ]
|
||||
[ mb-dim { 2 2 } = ] bi* and
|
||||
[ drop YUV420 ] when
|
||||
] when ;
|
||||
|
||||
! this eats ~50% cpu time
|
||||
: draw-macroblocks ( mbs -- )
|
||||
jpeg> detect-colorspace
|
||||
{
|
||||
{ YUV420 [ [ first2 draw-macroblock-yuv420 ] each ] }
|
||||
{ YUV444 [ [ first2 draw-macroblock-yuv444 ] each ] }
|
||||
{ Y [ [ first2 draw-macroblock-y ] each ] }
|
||||
[ unsupported-colorspace ]
|
||||
} case ;
|
||||
|
||||
! this eats ~25% cpu time
|
||||
: color-transform ( yuv -- rgb )
|
||||
{ 128 0 0 } v+ yuv>bgr-matrix swap m.v
|
||||
[ 0 max 255 min >fixnum ] map ;
|
||||
|
||||
: baseline-decompress ( -- )
|
||||
jpeg> bitstream>> cleanup-bitstream { 255 255 255 255 } append
|
||||
>byte-array bs:<msb0-bit-reader> jpeg> (>>bitstream)
|
||||
jpeg>
|
||||
[ bitstream>> ]
|
||||
[ [ [ <huffman-decoder> ] with map ] change-huff-tables drop ] bi
|
||||
jpeg> components>> [ fetch-tables ] each
|
||||
[ decode-macroblock 2array ] accumulator
|
||||
[ all-macroblocks ] dip
|
||||
jpeg> setup-bitmap draw-macroblocks
|
||||
jpeg> bitmap>> 3 <groups> [ color-transform ] change-each
|
||||
jpeg> [ >byte-array ] change-bitmap drop ;
|
||||
|
||||
ERROR: not-a-jpeg-image ;
|
||||
|
||||
PRIVATE>
|
||||
|
||||
: load-jpeg ( path -- image )
|
||||
binary [
|
||||
parse-marker { SOI } = [ not-a-jpeg-image ] unless
|
||||
parse-headers
|
||||
contents <jpeg-image>
|
||||
] with-file-reader
|
||||
dup jpeg-image [
|
||||
baseline-parse
|
||||
baseline-decompress
|
||||
] with-variable ;
|
||||
|
||||
M: jpeg-image load-image* ( path jpeg-image -- bitmap )
|
||||
drop load-jpeg ;
|
||||
|
||||
|
|
|
|||
|
|
@ -1,7 +1,7 @@
|
|||
! Copyright (C) 2005, 2009 Slava Pestov.
|
||||
! See http://factorcode.org/license.txt for BSD license.
|
||||
USING: arrays fry kernel math math.order math.vectors
|
||||
sequences sequences.private accessors columns ;
|
||||
USING: accessors arrays columns kernel math math.bits
|
||||
math.order math.vectors sequences sequences.private fry ;
|
||||
IN: math.matrices
|
||||
|
||||
! Matrices
|
||||
|
|
@ -61,3 +61,7 @@ PRIVATE>
|
|||
|
||||
: cross-zip ( seq1 seq2 -- seq1xseq2 )
|
||||
[ [ 2array ] with map ] curry map ;
|
||||
|
||||
: m^n ( m n -- n )
|
||||
make-bits over first length identity-matrix
|
||||
[ [ dupd m. ] when [ dup m. ] dip ] reduce nip ;
|
||||
|
|
|
|||
|
|
@ -8,16 +8,16 @@ HELP: dispose
|
|||
$nl
|
||||
"No further operations can be performed on a disposable object after this call."
|
||||
$nl
|
||||
"Disposing an object which has already been disposed should have no effect, and in particular it should not fail with an error. To help implement this pattern, add a " { $snippet "disposed" } " slot to your object and implement the " { $link dispose* } " method instead." }
|
||||
"Disposing an object which has already been disposed should have no effect, and in particular it should not fail with an error. To help implement this pattern, add a " { $slot "disposed" } " slot to your object and implement the " { $link dispose* } " method instead." }
|
||||
{ $notes "You must close disposable objects after you are finished working with them, to avoid leaking operating system resources. A convenient way to automate this is by using the " { $link with-disposal } " word."
|
||||
$nl
|
||||
"The default implementation assumes the object has a " { $snippet "disposable" } " slot. If the slot is set to " { $link f } ", it calls " { $link dispose* } " and sets the slot to " { $link f } "." } ;
|
||||
"The default implementation assumes the object has a " { $slot "disposed" } " slot. If the slot is set to " { $link f } ", it calls " { $link dispose* } " and sets the slot to " { $link f } "." } ;
|
||||
|
||||
HELP: dispose*
|
||||
{ $values { "disposable" "a disposable object" } }
|
||||
{ $contract "Releases operating system resources associated with a disposable object. Disposable objects include streams, memory mapped files, and so on." }
|
||||
{ $notes
|
||||
"This word should not be called directly. It can be implemented on objects with a " { $snippet "disposable" } " slot to ensure that the object is only disposed once."
|
||||
"This word should not be called directly. It can be implemented on objects with a " { $slot "disposed" } " slot to ensure that the object is only disposed once."
|
||||
} ;
|
||||
|
||||
HELP: with-disposal
|
||||
|
|
|
|||
|
|
@ -0,0 +1,20 @@
|
|||
! by blei on #concatenative
|
||||
USING: kernel sequences math locals make multiline ;
|
||||
IN: nested-comments
|
||||
|
||||
:: (subsequences-at) ( sseq seq n -- )
|
||||
sseq seq n start*
|
||||
[ dup , sseq length + [ sseq seq ] dip (subsequences-at) ]
|
||||
when* ;
|
||||
|
||||
: subsequences-at ( sseq seq -- indices )
|
||||
[ 0 (subsequences-at) ] { } make ;
|
||||
|
||||
: count-subsequences ( sseq seq -- i )
|
||||
subsequences-at length ;
|
||||
|
||||
: parse-all-(* ( parsed-vector left-to-parse -- parsed-vector )
|
||||
1 - "*)" parse-multiline-string [ "(*" ] dip
|
||||
count-subsequences + dup 0 > [ parse-all-(* ] [ drop ] if ;
|
||||
|
||||
SYNTAX: (* 1 parse-all-(* ;
|
||||
Loading…
Reference in New Issue