141 lines
3.5 KiB
Tal
141 lines
3.5 KiB
Tal
|00 @System &vector $2 &expansion $2 &wst $1 &rst $1 &metadata $2 &r $2 &g $2 &b $2 &debug $1 &state $1
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|10 @Console &vector $2 &read $1 &pad $4 &type $1 &write $1 &error $1
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|a0 @File/vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2
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%dbug { #01 .System/debug DEO }
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(
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Portable BitMap
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https://en.wikipedia.org/wiki/Netpbm#File_formats
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P4
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# This is an example binary format of the letter "J" with each byte in decimal notation
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6 10
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8 8 8 8 8 8 136 112 0 0
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88x31 pixel image
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row of 88px -> 11 bytes 8 bits per byte
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31 rows -> 341 bytes
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hexdump -C footer.pbm
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)
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|1550 @drawing-size
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|15f @image-size ( header 9 + data 341 = 350 )
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|0100
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@on-reset
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( set img-pt to start of img )
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;img ;img-pt STA2
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( file header )
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LIT "P write-to-image
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LIT "4 write-to-image
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#0a write-to-image
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LIT "8 write-to-image
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LIT "8 write-to-image
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#20 write-to-image
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LIT "3 write-to-image
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LIT "1 write-to-image
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#0a write-to-image
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( image data )
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load-drawing
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#1f ;/y STA
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&y-loop
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#58 ;/x STA
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#01 ;/i STA
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&row-loop
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;/x LDA #07 ADD ;/y LDA get-pixel
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;/x LDA #06 ADD ;/y LDA get-pixel
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;/x LDA #05 ADD ;/y LDA get-pixel
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;/x LDA #04 ADD ;/y LDA get-pixel
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;/x LDA #03 ADD ;/y LDA get-pixel
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;/x LDA #02 ADD ;/y LDA get-pixel
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;/x LDA #01 ADD ;/y LDA get-pixel
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;/x LDA ;/y LDA get-pixel
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build-byte
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write-to-image
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;/x LDA #08 ADD ;/x STA
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;/i LDA INC ;/i STA
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;/i LDA #0c NEQ ?/row-loop ( run 11 times )
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;/y LDA #01 ADD ;/y STA
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;/y LDA #3e
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NEQ ?/y-loop ( run 31 times )
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save-file
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BRK
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&i $1
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&y $1
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&x $1
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( take 8 01 / 00 off the stack and create a byte with them )
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@build-byte ( p p p p p p p p )
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LITr 00 ( p p p p p p p p | 00 )
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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LITr 10 SFTr
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?{ LITr 01 ORAr }
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STHr
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JMP2r
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( given a pixel x,y figure out if it is part of the drawing )
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@get-pixel ( x y -> bool )
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,/y STR ( x )
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,/x STR ( )
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;drawing ,/pt STR2
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&loop
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( looped through the entire drawing? )
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,/pt LDR2 ( pt* )
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;drawing ;drawing-size ADD2 ( pt* end-of-drawing* )
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EQU2 ?/not-found
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( check if current x y has already been visited )
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,/pt LDR2 LDA2 ( x1 y1 )
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,/x LDR ( x1 y1 x )
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,/y LDR ( x1 y1 x y )
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EQU2 ?/found
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( incrment pointer and save it )
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,/pt LDR2 ( pt* )
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#0002 ADD2 ( pt+2* )
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,/pt STR2
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!/loop
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¬-found #01 JMP2r
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&found #00 JMP2r
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&pt $2
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&x $1
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&y $1
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( load .1line drawing file from disk to memory )
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@load-drawing
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;/filename .File/name DEO2
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;drawing-size .File/length DEO2
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;drawing .File/read DEO2
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JMP2r
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&filename "footer.1line $1
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( write a single byte to the image buffer )
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@write-to-image ( val )
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;img-pt LDA2 ( val pt* )
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STA ( )
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;img-pt LDA2 ( pt* )
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#0001 ADD2 ( pt*+1 )
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;img-pt STA2
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JMP2r
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( save the image buffer to disk )
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@save-file
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;/filename .File/name DEO2
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;image-size .File/length DEO2
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;img .File/write DEO2
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JMP2r
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&filename "footer.pbm $1
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@img-pt $2
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@img $image-size
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@drawing $drawing-size
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