--- /dev/null
+! Copyright (C) 2009 Marc Fauconneau.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors arrays byte-arrays combinators
+compression.huffman fry grouping images images.loader
+images.processing io io.binary io.encodings.binary
+io.streams.byte-array io.streams.limited io.streams.throwing
+kernel locals math math.bitwise math.blas.matrices
+math.blas.vectors math.constants math.functions math.matrices
+math.order math.vectors memoize namespaces sequences
+sequences.deep ;
+QUALIFIED-WITH: bitstreams bs
+IN: images.jpeg
+
+SINGLETON: jpeg-image
+
+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 } ;
+
+{ "jpg" "jpeg" } [ jpeg-image ?register-image-class ] each
+
+<PRIVATE
+
+: <loading-jpeg> ( headers bitstream -- image )
+ loading-jpeg new swap >>bitstream swap >>headers ;
+
+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 0xCC = ] [ { DAC } ] }
+ { [ dup 0xC4 = ] [ { DHT } ] }
+ { [ dup 0xC9 = ] [ { JPG } ] }
+ { [ dup -4 shift 0xC = ] [ SOF byte 4 bits 2array ] }
+
+ { [ dup 0xD8 = ] [ { SOI } ] }
+ { [ dup 0xD9 = ] [ { EOI } ] }
+ { [ dup 0xDA = ] [ { SOS } ] }
+ { [ dup 0xDB = ] [ { DQT } ] }
+ { [ dup 0xDC = ] [ { DNL } ] }
+ { [ dup 0xDD = ] [ { DRI } ] }
+ { [ dup 0xDE = ] [ { DHP } ] }
+ { [ dup 0xDF = ] [ { EXP } ] }
+ { [ dup -4 shift 0xD = ] [ RST byte 4 bits 2array ] }
+
+ { [ dup -4 shift 0xE = ] [ APP byte 4 bits 2array ] }
+ { [ dup 0xFE = ] [ { COM } ] }
+ { [ dup -4 shift 0xF = ] [ JPG byte 4 bits 2array ] }
+
+ { [ dup 0x01 = ] [ { TEM } ] }
+ [ { RES } ]
+ }
+ cond nip ;
+
+TUPLE: jpeg-chunk length type data ;
+
+: <jpeg-chunk> ( type length data -- jpeg-chunk )
+ jpeg-chunk new
+ swap >>data
+ swap >>length
+ swap >>type ;
+
+TUPLE: jpeg-color-info
+ h v quant-table dc-huff-table ac-huff-table { diff initial: 0 } id ;
+
+: <jpeg-color-info> ( h v quant-table -- jpeg-color-info )
+ jpeg-color-info new
+ swap >>quant-table
+ swap >>v
+ swap >>h ;
+
+: 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 <byte-reader> ] [ length ] bi limit-stream [
+ [ input-stream get stream>> [ count>> ] [ limit>> ] bi < ]
+ [
+ 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
+ ] while
+ ] stream-throw-on-eof ;
+
+: decode-scan ( chunk -- )
+ data>>
+ binary
+ [
+ read1 <iota>
+ [ 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 ;
+
+ERROR: not-a-baseline-jpeg-image ;
+
+: baseline-parse ( -- )
+ jpeg> headers>> [ type>> { SOF 0 } = ] any? [ not-a-baseline-jpeg-image ] unless
+ 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 0xFF 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 <iota> [ 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 vdotm ;
+
+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-factor ;
+
+:: draw-block ( block x,y color-id jpeg-image -- )
+ block dup length>> sqrt >fixnum group flip
+ dup matrix-dim coord-matrix flip
+ [
+ [ '[ _ [ second ] [ first ] bi ] dip 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 * ]
+ [ [ decode-block ] curry replicate ] bi
+ ] map concat ;
+
+: cleanup-bitstream ( bytes -- bytes' )
+ binary [
+ [
+ { 0xFF } read-until
+ read1 [ 0x00 = and ] keep swap
+ ]
+ [ drop ] produce
+ swap >marker { EOI } assert=
+ swap suffix
+ { 0xFF } join
+ ] with-byte-reader ;
+
+: setup-bitmap ( image -- )
+ dup dim>> 16 v/n [ ceiling ] map 16 v*n >>dim
+ BGR >>component-order
+ ubyte-components >>component-type
+ 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 mdotv
+ [ 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 ] collector
+ [ all-macroblocks ] dip
+ jpeg> setup-bitmap draw-macroblocks
+ jpeg> bitmap>> 3 <groups> [ color-transform ] map! drop
+ jpeg> [ >byte-array ] change-bitmap drop ;
+
+ERROR: not-a-jpeg-image ;
+
+: loading-jpeg>image ( loading-jpeg -- image )
+ dup jpeg-image [
+ baseline-parse
+ baseline-decompress
+ ] with-variable ;
+
+: load-jpeg ( stream -- loading-jpeg )
+ [
+ parse-marker { SOI } = [ not-a-jpeg-image ] unless
+ parse-headers
+ contents <loading-jpeg>
+ ] with-input-stream ;
+
+PRIVATE>
+
+M: jpeg-image stream>image*
+ drop load-jpeg loading-jpeg>image ;
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