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support run-length encoding in bitmaps

db4
Doug Coleman 2009-06-02 23:29:04 -05:00
parent 367623e375
commit f31c3f867a
2 changed files with 12 additions and 4 deletions
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7
basis/compression/run-length/run-length.factor Normal file
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@ -0,0 +1,7 @@
! Copyright (C) 2009 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: arrays grouping sequences ;
IN: compression.run-length
: run-length-uncompress8 ( byte-array -- byte-array' )
2 group [ first2 <array> ] map concat ;

9
basis/images/bitmap/bitmap.factor
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@ -1,9 +1,10 @@
! Copyright (C) 2007, 2009 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors alien alien.c-types arrays byte-arrays columns
combinators fry grouping io io.binary io.encodings.binary io.files
kernel macros math math.bitwise math.functions namespaces sequences
strings images endian summary locals images.loader ;
combinators compression.run-length endian fry grouping images
images.loader io io.binary io.encodings.binary io.files kernel
locals macros math math.bitwise math.functions namespaces
sequences strings summary ;
IN: images.bitmap
: assert-sequence= ( a b -- )
@ -54,7 +55,7 @@ ERROR: unsupported-bitmap-compression compression ;
: uncompress-bitmap ( loading-bitmap -- loading-bitmap' )
dup compression>> {
{ 0 [ ] }
{ 1 [ "run-length encoding 8" unsupported-bitmap-compression ] }
{ 1 [ [ run-length-uncompress8 ] change-color-index ] }
{ 2 [ "run-length encoding 4" unsupported-bitmap-compression ] }
{ 3 [ "bitfields" unsupported-bitmap-compression ] }
{ 4 [ "jpeg" unsupported-bitmap-compression ] }