uxn-utils/gui/sixels/sixels.tal

|00 @System &vector $2 &expansion $2 &wst $1 &rst $1 &metadata $2 &r $2 &g $2 &b $2 &debug $1 &state $1
|10 @Console &vector $2 &read $1 &pad $4 &type $1 &write $1 &error $1
|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1
|a0 @File &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2

|0000

	@src $40

|0100

@on-reset ( -> )
	#f0ef .System/r DEO2
	#f0e6 .System/g DEO2
	#f0e2 .System/b DEO2
	#0010 DUP2 .Screen/x DEO2
	.Screen/y DEO2
	#0120 DUP2 .Screen/width DEO2
	.Screen/height DEO2
	( | begin )
	;on-console .Console/vector DEO2
	BRK

@on-console ( -> )
	.Console/read DEI DUP #20 LTH OVR #7f GTH ORA ?{
		;src scap STA
		BRK }
	POP
	( | load )
	;src .File/name DEO2
	#8000 .File/length DEO2
	;img/data .File/read DEO2
	;img/data <draw-sixels>
	BRK

@<draw-sixels> ( data* -- )
	[ LIT2 02 -Screen/auto ] DEO
	.Screen/x DEI2 ,&anchor STR2
	&w ( -- )
		LDAk [ LIT "$ ] EQU ?&op-over
		LDAk [ LIT "- ] EQU ?&op-line
		LDAk [ LIT "! ] EQU ?&op-rle
		LDAk [ LIT "? ] SUB <draw-sixels>/op-col
		& INC2 LDAk ?&w
	POP2 JMP2r
	&op-line ( -- )
		.Screen/y DEI2k #0006 ADD2 ROT DEO2
	&op-over ( -- )
		[ LIT2 &anchor $2 ] .Screen/x DEO2
		!&

@<draw-sixels>/op-rle ( addr* -- addr* )
	LDAk #19 DEO
	INC2k sdec pdec #2019 DEO
	LDA #19 DEO
	#0a19 DEO


	( rune ) INC2
	( length ) sdec

	( target ) OVR2 LDA [ LIT "? ] SUB ,&t STR
	#0000
	&l ( -- )
		[ LIT &t $1 ] DUP #19 DEO <draw-sixels>/op-col
		INC2 GTH2k ?&l #0a19 DEO
	POP2 POP2 INC2 !<draw-sixels>/

@<draw-sixels>/op-col ( byte -- )
	,&t STR
	#0600
	&l ( -- )
		[ LIT &t $1 ] OVR SFT #01 AND .Screen/pixel DEO
		INC GTHk ?&l
	POP2
	( | advance )
	.Screen/x DEI2k INC2 ROT DEO2
	.Screen/y DEI2k #0006 SUB2 ROT DEO2
	JMP2r

(
@|stdlib )

@sdec ( str* -- str* val* )
	[ LIT2r 0000 ]
	&w ( -- )
		( validate ) LDAk [ LIT "0 ] SUB #09 GTH ?&end
		( accumulate ) [ LIT2r 000a ] MUL2r
		( combine ) LDAk [ LIT "0 ] SUB [ LITr 00 ] STH ADD2r
		( continue ) INC2 LDAk ?&w
	&end STH2r JMP2r

@scap ( str* -- end* )
	LDAk #00 NEQ [ JMP JMP2r ] &w INC2 LDAk ?&w
	JMP2r

@phex ( short* -- )
	SWP phex/b
	&b ( -- )
		DUP #04 SFT phex/c
	&c ( -- )
		#0f AND DUP #09 GTH #27 MUL ADD [ LIT "0 ] ADD #18 DEO
		JMP2r

@pdec ( short* -- )
	#2710 [ LIT2r 00fb ]
	&w ( -- )
		DIV2k #000a DIV2k MUL2 SUB2 SWPr EQUk OVR STHkr EQU AND ?{
			DUP [ LIT "0 ] ADD #19 DEO
			INCr }
		POP2 #000a DIV2 SWPr INCr STHkr ?&w
	POP2r POP2 POP2 JMP2r

(
@|memory )

@sample [ "???owYn||~ywo??-?IRJaVNn^NVbJRI $1 ]

@img &data