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compression.lzw: supports both TIFF and GIF

db4
Keith Lazuka 2009-09-25 16:51:47 -04:00
parent 64c93d873f
commit 8dec2070e5
5 changed files with 46 additions and 171 deletions
basis
compression/lzw
images/tiff
extra
compression/lzw-gif
images/gif

78
basis/compression/lzw/lzw.factor
View File

@ -5,28 +5,38 @@ prettyprint sequences vectors ;
QUALIFIED-WITH: bitstreams bs
IN: compression.lzw
SYMBOL: clear-code
4 clear-code set-global
SYMBOL: current-lzw
SYMBOL: end-of-information
5 end-of-information set-global
TUPLE: lzw
input
output
table
code
old-code
initial-code-size
code-size
clear-code
end-of-information-code ;
TUPLE: lzw input output table code old-code initial-code-size code-size ;
TUPLE: tiff-lzw < lzw ;
TUPLE: gif-lzw < lzw ;
: initial-uncompress-table ( -- seq )
end-of-information get 1 + iota [ 1vector ] V{ } map-as ;
current-lzw get end-of-information-code>> 1 +
iota [ 1vector ] V{ } map-as ;
: reset-lzw-uncompress ( lzw -- lzw )
initial-uncompress-table >>table
dup initial-code-size>> >>code-size ;
: <lzw-uncompress> ( input code-size -- obj )
lzw new
swap >>initial-code-size
dup initial-code-size>> >>code-size
: <lzw-uncompress> ( input code-size class -- obj )
new
swap >>code-size
dup code-size>> >>initial-code-size
dup code-size>> 1 - 2^ >>clear-code
dup clear-code>> 1 + >>end-of-information-code
swap >>input
BV{ } clone >>output
reset-lzw-uncompress ;
BV{ } clone >>output ;
ERROR: not-in-table value ;
@ -45,15 +55,16 @@ ERROR: not-in-table value ;
: write-code ( lzw -- )
[ lookup-code ] [ output>> ] bi push-all ;
: kdebug ( lzw -- lzw )
dup "TIFF: incrementing code size " write
[ code-size>> pprint ]
[ " table length " write table>> length pprint ] bi
nl ;
GENERIC: code-space-full? ( lzw -- ? )
M: tiff-lzw code-space-full?
[ table>> length ] [ code-size>> 2^ 1 - ] bi = ;
M: gif-lzw code-space-full?
[ table>> length ] [ code-size>> 2^ ] bi = ;
: maybe-increment-code-size ( lzw -- lzw )
dup [ table>> length ] [ code-size>> 2^ 1 - ] bi =
[ kdebug [ 1 + ] change-code-size ] when ;
dup code-space-full? [ [ 1 + ] change-code-size ] when ;
: add-to-table ( seq lzw -- )
[ table>> push ]
@ -64,9 +75,8 @@ ERROR: not-in-table value ;
DEFER: lzw-uncompress-char
: handle-clear-code ( lzw -- )
"CLEAR CODE" print
reset-lzw-uncompress
lzw-read dup end-of-information get = [
lzw-read dup current-lzw get end-of-information-code>> = [
2drop
] [
>>code
@ -94,10 +104,10 @@ DEFER: lzw-uncompress-char
: lzw-uncompress-char ( lzw -- )
lzw-read [
>>code
dup code>> end-of-information get = [
dup code>> current-lzw get end-of-information-code>> = [
drop
] [
dup code>> clear-code get = [
dup code>> current-lzw get clear-code>> = [
handle-clear-code
] [
handle-uncompress-code
@ -108,19 +118,13 @@ DEFER: lzw-uncompress-char
drop
] if* ;
: register-special-codes ( first-code-size -- first-code-size )
[
1 - 2^ dup clear-code set
1 + end-of-information set
] keep ;
: lzw-uncompress ( bitstream code-size class -- byte-array )
<lzw-uncompress> dup current-lzw [
[ reset-lzw-uncompress drop ] [ lzw-uncompress-char ] [ output>> ] tri
] with-variable ;
: lzw-uncompress ( bitstream code-size -- byte-array )
register-special-codes
<lzw-uncompress>
[ lzw-uncompress-char ] [ output>> ] bi ;
: tiff-lzw-uncompress ( seq -- byte-array )
bs:<msb0-bit-reader> 9 tiff-lzw lzw-uncompress ;
: lzw-uncompress-msb0 ( seq code-size -- byte-array )
[ bs:<msb0-bit-reader> ] dip lzw-uncompress ;
: lzw-uncompress-lsb0 ( seq code-size -- byte-array )
[ bs:<lsb0-bit-reader> ] dip lzw-uncompress ;
: gif-lzw-uncompress ( seq code-size -- byte-array )
[ bs:<lsb0-bit-reader> ] dip gif-lzw lzw-uncompress ;

5
basis/images/tiff/tiff.factor
View File

@ -434,13 +434,10 @@ ERROR: bad-small-ifd-type n ;
ERROR: unhandled-compression compression ;
: lzw-tiff-uncompress ( seq -- byte-array )
9 lzw-uncompress-msb0 ;
: (uncompress-strips) ( strips compression -- uncompressed-strips )
{
{ compression-none [ ] }
{ compression-lzw [ [ lzw-tiff-uncompress ] map ] }
{ compression-lzw [ [ tiff-lzw-uncompress ] map ] }
[ unhandled-compression ]
} case ;

126
extra/compression/lzw-gif/lzw-gif.factor
View File

@ -1,126 +0,0 @@
! Copyright (C) 2009 Doug Coleman, Keith Lazuka
! See http://factorcode.org/license.txt for BSD license.
USING: accessors combinators io kernel math namespaces
prettyprint sequences vectors ;
QUALIFIED-WITH: bitstreams bs
IN: compression.lzw-gif
SYMBOL: clear-code
4 clear-code set-global
SYMBOL: end-of-information
5 end-of-information set-global
TUPLE: lzw input output table code old-code initial-code-size code-size ;
: initial-uncompress-table ( -- seq )
end-of-information get 1 + iota [ 1vector ] V{ } map-as ;
: reset-lzw-uncompress ( lzw -- lzw )
initial-uncompress-table >>table
dup initial-code-size>> >>code-size ;
: <lzw-uncompress> ( input code-size -- obj )
lzw new
swap >>initial-code-size
dup initial-code-size>> >>code-size
swap >>input
BV{ } clone >>output
reset-lzw-uncompress ;
ERROR: not-in-table value ;
: lookup-old-code ( lzw -- vector )
[ old-code>> ] [ table>> ] bi nth ;
: lookup-code ( lzw -- vector )
[ code>> ] [ table>> ] bi nth ;
: code-in-table? ( lzw -- ? )
[ code>> ] [ table>> length ] bi < ;
: code>old-code ( lzw -- lzw )
dup code>> >>old-code ;
: write-code ( lzw -- )
[ lookup-code ] [ output>> ] bi push-all ;
: kdebug ( lzw -- lzw )
dup "GIF: incrementing code size " write
[ code-size>> pprint ]
[ " table length " write table>> length pprint ] bi
nl ;
: maybe-increment-code-size ( lzw -- lzw )
dup [ table>> length ] [ code-size>> 2^ ] bi =
[ kdebug [ 1 + ] change-code-size ] when ;
: add-to-table ( seq lzw -- )
[ table>> push ]
[ maybe-increment-code-size 2drop ] 2bi ;
: lzw-read ( lzw -- lzw n )
[ ] [ code-size>> ] [ input>> ] tri bs:read ;
DEFER: lzw-uncompress-char
: handle-clear-code ( lzw -- )
"CLEAR CODE" print
reset-lzw-uncompress
lzw-read dup end-of-information get = [
2drop
] [
>>code
[ write-code ]
[ code>old-code ] bi
lzw-uncompress-char
] if ;
: handle-uncompress-code ( lzw -- lzw )
dup code-in-table? [
[ write-code ]
[
[
[ lookup-old-code ]
[ lookup-code first ] bi suffix
] [ add-to-table ] bi
] [ code>old-code ] tri
] [
[
[ lookup-old-code dup first suffix ] keep
[ output>> push-all ] [ add-to-table ] 2bi
] [ code>old-code ] bi
] if ;
: lzw-uncompress-char ( lzw -- )
lzw-read [
>>code
dup code>> end-of-information get = [
drop
] [
dup code>> clear-code get = [
handle-clear-code
] [
handle-uncompress-code
lzw-uncompress-char
] if
] if
] [
drop
] if* ;
: register-special-codes ( first-code-size -- first-code-size )
[
1 - 2^ dup clear-code set
1 + end-of-information set
] keep ;
: lzw-uncompress ( bitstream code-size -- byte-array )
register-special-codes
<lzw-uncompress>
[ lzw-uncompress-char ] [ output>> ] bi ;
: lzw-uncompress-msb0 ( seq code-size -- byte-array )
[ bs:<msb0-bit-reader> ] dip lzw-uncompress ;
: lzw-uncompress-lsb0 ( seq code-size -- byte-array )
[ bs:<lsb0-bit-reader> ] dip lzw-uncompress ;

4
extra/images/gif/gif-tests.factor
View File

@ -1,6 +1,6 @@
! Copyright (C) 2009 Keith Lazuka.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors bitstreams compression.lzw-gif images.gif io
USING: accessors bitstreams compression.lzw images.gif io
io.encodings.binary io.files kernel math math.bitwise
math.parser namespaces prettyprint sequences tools.test images.viewer ;
QUALIFIED-WITH: bitstreams bs
@ -49,7 +49,7 @@ IN: images.gif.tests
: >index-stream ( gif -- seq )
[ compressed-bytes>> ]
[ image-descriptor>> first-code-size>> ] bi
lzw-uncompress-lsb0 ;
gif-lzw-uncompress ;
[
BV{

4
extra/images/gif/gif.factor
View File

@ -1,6 +1,6 @@
! Copyrigt (C) 2009 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors arrays assocs combinators compression.lzw-gif
USING: accessors arrays assocs combinators compression.lzw
constructors destructors grouping images images.loader io
io.binary io.buffers io.encodings.binary io.encodings.string
io.encodings.utf8 io.files io.files.info io.ports
@ -227,7 +227,7 @@ ERROR: unhandled-data byte ;
: decompress ( loading-gif -- indexes )
[ compressed-bytes>> ]
[ image-descriptor>> first-code-size>> ] bi
lzw-uncompress-lsb0 ;
gif-lzw-uncompress ;
: colorize ( index palette transparent-index/f -- seq )
pick = [ 2drop B{ 0 0 0 0 } ] [ nth 255 suffix ] if ;