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|
# load an image from disk and display it on screen
#
# To build:
# $ ./translate shell/*.mu # generates code.img
# Load a pbm, pgm or ppm image (no more than 255 levels)
# $ dd if=/dev/zero of=data.img count=20160
# $ cat x.pbm |dd of=data.img conv=notrunc
# or
# $ cat t.pgm |dd of=data.img conv=notrunc
# or
# $ cat snail.ppm |dd of=data.img conv=notrunc
# To run:
# $ qemu-system-i386 -hda code.img -hdb data.img
type image {
type: int # supported types:
# 1: portable bitmap (P1) - pixels 0 or 1
# 2: portable greymap (P2) - pixels 1-byte greyscale values
# 3: portable pixmap (P3) - pixels 3-byte rgb values
max: int
width: int
height: int
data: (handle array byte)
}
fn main screen: (addr screen), keyboard: (addr keyboard), data-disk: (addr disk) {
var img-storage: image
var img/esi: (addr image) <- address img-storage
load-image img, data-disk
render-image screen, img, 0/x, 0/y, 0x400/width, 0x400/height
#? render-image screen, img, 0x120/x, 0x180/y, 0x12c/width=300, 0xc8/height=200
#? render-image screen, img, 0x320/x, 0x280/y, 0x60/width=96, 0x1c/height=28
#? render-pgm-image screen, img, 0x1c0/x, 0x100/y, 0x12c/width=300, 0xc8/height=200
#? draw-box-on-real-screen 0x1bf/x, 0x102/y, 0x1c4/x, 0x104/y, 4/fg
#? render-image screen, img, 0x80/x, 0x100/y, 0x12c/width=300, 0xc8/height=200
#? set-cursor-position 0/screen, 0/x 2/y
#? render-pgm-image screen, img, 0x200/x, 0x100/y, 0x200/width, 0x200/height
#? render-image screen, img, 0/x, 0x100/y, 0x200/width, 0x200/height
}
fn load-image self: (addr image), data-disk: (addr disk) {
# data-disk -> stream
var s-storage: (stream byte 0xc0000) # 512*3 sectors
var s/ebx: (addr stream byte) <- address s-storage
draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "loading sectors from data disk", 3/fg, 0/bg
move-cursor-to-left-margin-of-next-line 0/screen
load-sectors data-disk, 0/lba, 0x100/sectors, s
load-sectors data-disk, 0x100/lba, 0x100/sectors, s
load-sectors data-disk, 0x200/lba, 0x100/sectors, s
load-sectors data-disk, 0x300/lba, 0x100/sectors, s
load-sectors data-disk, 0x400/lba, 0x100/sectors, s
load-sectors data-disk, 0x500/lba, 0x100/sectors, s
draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "parsing", 3/fg, 0/bg
move-cursor-to-left-margin-of-next-line 0/screen
initialize-image self, s
}
fn initialize-image _self: (addr image), in: (addr stream byte) {
var self/esi: (addr image) <- copy _self
var mode-storage: slice
var mode/ecx: (addr slice) <- address mode-storage
next-word in, mode
{
var P1?/eax: boolean <- slice-equal? mode, "P1"
compare P1?, 0/false
break-if-=
var type-a/eax: (addr int) <- get self, type
copy-to *type-a, 1/ppm
initialize-image-from-pbm self, in
return
}
{
var P2?/eax: boolean <- slice-equal? mode, "P2"
compare P2?, 0/false
break-if-=
var type-a/eax: (addr int) <- get self, type
copy-to *type-a, 2/pgm
initialize-image-from-pgm self, in
return
}
{
var P3?/eax: boolean <- slice-equal? mode, "P3"
compare P3?, 0/false
break-if-=
var type-a/eax: (addr int) <- get self, type
copy-to *type-a, 3/ppm
initialize-image-from-ppm self, in
return
}
abort "initialize-image: unrecognized image type"
}
# dispatch to a few variants with mostly identical boilerplate
fn render-image screen: (addr screen), _img: (addr image), xmin: int, ymin: int, width: int, height: int {
var img/esi: (addr image) <- copy _img
var type-a/eax: (addr int) <- get img, type
{
compare *type-a, 1/pbm
break-if-!=
render-pbm-image screen, img, xmin, ymin, width, height
return
}
{
compare *type-a, 2/pgm
break-if-!=
var img2-storage: image
var img2/edi: (addr image) <- address img2-storage
dither-pgm-with-monochrome img, img2
render-pbm-image screen, img2, xmin, ymin, width, height
return
}
{
compare *type-a, 3/ppm
break-if-!=
render-ppm-image screen, img, xmin, ymin, width, height
return
}
abort "render-image: unrecognized image type"
}
## helpers
# import a black-and-white ascii bitmap (each pixel is 0 or 1)
fn initialize-image-from-pbm _self: (addr image), in: (addr stream byte) {
var self/esi: (addr image) <- copy _self
var curr-word-storage: slice
var curr-word/ecx: (addr slice) <- address curr-word-storage
# load width, height
next-word in, curr-word
var tmp/eax: int <- parse-decimal-int-from-slice curr-word
var width/edx: int <- copy tmp
next-word in, curr-word
tmp <- parse-decimal-int-from-slice curr-word
var height/ebx: int <- copy tmp
# save width, height
var dest/eax: (addr int) <- get self, width
copy-to *dest, width
dest <- get self, height
copy-to *dest, height
# initialize data
var capacity/edx: int <- copy width
capacity <- multiply height
var data-ah/edi: (addr handle array byte) <- get self, data
populate data-ah, capacity
var _data/eax: (addr array byte) <- lookup *data-ah
var data/edi: (addr array byte) <- copy _data
var i/ebx: int <- copy 0
{
compare i, capacity
break-if->=
next-word in, curr-word
var src/eax: int <- parse-decimal-int-from-slice curr-word
{
var dest/ecx: (addr byte) <- index data, i
copy-byte-to *dest, src
}
i <- increment
loop
}
}
# render a black-and-white ascii bitmap (each pixel is 0 or 1)
fn render-pbm-image screen: (addr screen), _img: (addr image), xmin: int, ymin: int, width: int, height: int {
var img/esi: (addr image) <- copy _img
# yratio = height/img->height
var img-height-a/eax: (addr int) <- get img, height
var img-height/xmm0: float <- convert *img-height-a
var yratio/xmm1: float <- convert height
yratio <- divide img-height
# xratio = width/img->width
var img-width-a/eax: (addr int) <- get img, width
var img-width/ebx: int <- copy *img-width-a
var img-width-f/xmm0: float <- convert img-width
var xratio/xmm2: float <- convert width
xratio <- divide img-width-f
# esi = img->data
var img-data-ah/eax: (addr handle array byte) <- get img, data
var _img-data/eax: (addr array byte) <- lookup *img-data-ah
var img-data/esi: (addr array byte) <- copy _img-data
var len/edi: int <- length img-data
#
var one/eax: int <- copy 1
var one-f/xmm3: float <- convert one
var width-f/xmm4: float <- convert width
var height-f/xmm5: float <- convert height
var zero/eax: int <- copy 0
var zero-f/xmm0: float <- convert zero
var y/xmm6: float <- copy zero-f
{
compare y, height-f
break-if-float>=
var imgy-f/xmm5: float <- copy y
imgy-f <- divide yratio
var imgy/edx: int <- truncate imgy-f
var x/xmm7: float <- copy zero-f
{
compare x, width-f
break-if-float>=
var imgx-f/xmm5: float <- copy x
imgx-f <- divide xratio
var imgx/ecx: int <- truncate imgx-f
var idx/eax: int <- copy imgy
idx <- multiply img-width
idx <- add imgx
# error info in case we rounded wrong and 'index' will fail bounds-check
compare idx, len
{
break-if-<
set-cursor-position 0/screen, 0x20/x 0x20/y
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgx, 3/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgy, 4/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, idx, 5/fg 0/bg
}
var src-a/eax: (addr byte) <- index img-data, idx
var src/eax: byte <- copy-byte *src-a
var color-int/eax: int <- copy src
{
compare color-int, 0/black
break-if-=
color-int <- copy 0xf/white
}
var screenx/ecx: int <- convert x
screenx <- add xmin
var screeny/edx: int <- convert y
screeny <- add ymin
pixel screen, screenx, screeny, color-int
x <- add one-f
loop
}
y <- add one-f
loop
}
}
# import a greyscale ascii "greymap" (each pixel is a shade of grey from 0 to 255)
fn initialize-image-from-pgm _self: (addr image), in: (addr stream byte) {
var self/esi: (addr image) <- copy _self
var curr-word-storage: slice
var curr-word/ecx: (addr slice) <- address curr-word-storage
# load width, height
next-word in, curr-word
var tmp/eax: int <- parse-decimal-int-from-slice curr-word
var width/edx: int <- copy tmp
next-word in, curr-word
tmp <- parse-decimal-int-from-slice curr-word
var height/ebx: int <- copy tmp
# check and save color levels
next-word in, curr-word
{
tmp <- parse-decimal-int-from-slice curr-word
compare tmp, 0xff
break-if-<=
abort "initialize-image-from-pgm: no more than 255 levels of grey"
}
var dest/edi: (addr int) <- get self, max
copy-to *dest, tmp
# save width, height
dest <- get self, width
copy-to *dest, width
dest <- get self, height
copy-to *dest, height
# initialize data
var capacity/edx: int <- copy width
capacity <- multiply height
var data-ah/edi: (addr handle array byte) <- get self, data
populate data-ah, capacity
var _data/eax: (addr array byte) <- lookup *data-ah
var data/edi: (addr array byte) <- copy _data
var i/ebx: int <- copy 0
{
compare i, capacity
break-if->=
next-word in, curr-word
var src/eax: int <- parse-decimal-int-from-slice curr-word
{
var dest/ecx: (addr byte) <- index data, i
copy-byte-to *dest, src
}
i <- increment
loop
}
}
# render a greyscale ascii "greymap" (each pixel is a shade of grey from 0 to 255) by quantizing the shades
fn render-pgm-image screen: (addr screen), _img: (addr image), xmin: int, ymin: int, width: int, height: int {
var img/esi: (addr image) <- copy _img
# yratio = height/img->height
var img-height-a/eax: (addr int) <- get img, height
var img-height/xmm0: float <- convert *img-height-a
var yratio/xmm1: float <- convert height
yratio <- divide img-height
# xratio = width/img->width
var img-width-a/eax: (addr int) <- get img, width
var img-width/ebx: int <- copy *img-width-a
var img-width-f/xmm0: float <- convert img-width
var xratio/xmm2: float <- convert width
xratio <- divide img-width-f
# esi = img->data
var img-data-ah/eax: (addr handle array byte) <- get img, data
var _img-data/eax: (addr array byte) <- lookup *img-data-ah
var img-data/esi: (addr array byte) <- copy _img-data
var len/edi: int <- length img-data
#
var one/eax: int <- copy 1
var one-f/xmm3: float <- convert one
var width-f/xmm4: float <- convert width
var height-f/xmm5: float <- convert height
var zero/eax: int <- copy 0
var zero-f/xmm0: float <- convert zero
var y/xmm6: float <- copy zero-f
{
compare y, height-f
break-if-float>=
var imgy-f/xmm5: float <- copy y
imgy-f <- divide yratio
var imgy/edx: int <- truncate imgy-f
var x/xmm7: float <- copy zero-f
{
compare x, width-f
break-if-float>=
var imgx-f/xmm5: float <- copy x
imgx-f <- divide xratio
var imgx/ecx: int <- truncate imgx-f
var idx/eax: int <- copy imgy
idx <- multiply img-width
idx <- add imgx
# error info in case we rounded wrong and 'index' will fail bounds-check
compare idx, len
{
break-if-<
set-cursor-position 0/screen, 0x20/x 0x20/y
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgx, 3/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgy, 4/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, idx, 5/fg 0/bg
}
var src-a/eax: (addr byte) <- index img-data, idx
var src/eax: byte <- copy-byte *src-a
var color-int/eax: int <- nearest-grey src
var screenx/ecx: int <- convert x
screenx <- add xmin
var screeny/edx: int <- convert y
screeny <- add ymin
pixel screen, screenx, screeny, color-int
x <- add one-f
loop
}
y <- add one-f
loop
}
}
fn nearest-grey level-255: byte -> _/eax: int {
var result/eax: int <- copy level-255
result <- shift-right 4
result <- add 0x10
return result
}
fn dither-pgm-with-monochrome _src: (addr image), _dest: (addr image) {
var src/esi: (addr image) <- copy _src
var dest/edi: (addr image) <- copy _dest
# copy 'width'
var src-width-a/ecx: (addr int) <- get src, width
var src-width/ecx: int <- copy *src-width-a
{
var dest-width-a/edx: (addr int) <- get dest, width
copy-to *dest-width-a, src-width
}
# copy 'height'
var src-height-a/edx: (addr int) <- get src, height
var src-height/edx: int <- copy *src-height-a
{
var dest-height-a/ecx: (addr int) <- get dest, height
copy-to *dest-height-a, src-height
}
# transform 'data'
var capacity/ebx: int <- copy src-width
capacity <- multiply src-height
var dest/edi: (addr image) <- copy _dest
var dest-data-ah/eax: (addr handle array byte) <- get dest, data
populate dest-data-ah, capacity
var _dest-data/eax: (addr array byte) <- lookup *dest-data-ah
var dest-data/edi: (addr array byte) <- copy _dest-data
# needs a buffer to temporarily hold more than 256 levels of precision
var buffer-storage: (array int 0xc0000)
var buffer/ebx: (addr array int) <- address buffer-storage
var src-data-ah/eax: (addr handle array byte) <- get src, data
var _src-data/eax: (addr array byte) <- lookup *src-data-ah
var src-data/esi: (addr array byte) <- copy _src-data
_unordered-monochrome-dither src-data, src-width, src-height, buffer, dest-data
}
fn _unordered-monochrome-dither src: (addr array byte), width: int, height: int, buf: (addr array int), dest: (addr array byte) {
var y/edx: int <- copy 0
{
compare y, height
break-if->=
#? psd "y", y, 9/fg, 0/x, y
var x/ecx: int <- copy 0
{
compare x, width
break-if->=
#? psd "x", x, 3/fg, x, y
var error/ebx: int <- _read-buffer buf, x, y, width
$_unordered-monochrome-dither:update-error: {
var curr/eax: byte <- _read-byte-buffer src, x, y, width
var curr-int/eax: int <- copy curr
curr-int <- shift-left 0x10 # we have 32 bits; we'll use 16 bits for the fraction and leave 8 for unanticipated overflow
error <- add curr-int
#? psd "e", error, 5/fg, x, y
compare error, 0x800000
{
break-if->=
#? psd "p", 0, 0x14/fg, x, y
_write-byte-buffer dest, x, y, width, 0/black
break $_unordered-monochrome-dither:update-error
}
#? psd "p", 1, 0xf/fg, x, y
_write-byte-buffer dest, x, y, width, 1/white
error <- subtract 0xff0000
}
_diffuse-monochrome-dithering-errors buf, x, y, width, height, error
x <- increment
loop
}
move-cursor-to-left-margin-of-next-line 0/screen
y <- increment
loop
}
}
# Use Floyd-Steinberg algorithm for turning an image of greyscale pixels into
# one of pure black or white pixels.
#
# https://tannerhelland.com/2012/12/28/dithering-eleven-algorithms-source-code.html
#
# Error is currently a fixed-point number with 16-bit fraction. But
# interestingly this function doesn't care about that.
fn _diffuse-monochrome-dithering-errors buf: (addr array int), x: int, y: int, width: int, height: int, error: int {
{
compare error, 0
break-if-!=
return
}
var width-1/esi: int <- copy width
width-1 <- decrement
var height-1/edi: int <- copy height
height-1 <- decrement
# delta = error/16
#? show-errors buf, width, height, x, y
var delta/ecx: int <- copy error
delta <- shift-right-signed 4
# In Floyd-Steinberg, each pixel X transmits its errors to surrounding
# pixels in the following proportion:
# X 7/16
# 3/16 5/16 1/16
var x/edx: int <- copy x
{
compare x, width-1
break-if->=
var tmp/eax: int <- copy 7
tmp <- multiply delta
var xright/edx: int <- copy x
xright <- increment
_accumulate-error buf, xright, y, width, tmp
}
var y/ebx: int <- copy y
{
compare y, height-1
break-if-<
return
}
var ybelow: int
copy-to ybelow, y
increment ybelow
{
compare x, 0
break-if-<=
var tmp/eax: int <- copy 3
tmp <- multiply delta
var xleft/edx: int <- copy x
xleft <- decrement
_accumulate-error buf, xleft, ybelow, width, tmp
}
{
var tmp/eax: int <- copy 5
tmp <- multiply delta
_accumulate-error buf, x, ybelow, width, tmp
}
{
compare x, width-1
break-if->=
var xright/edx: int <- copy x
xright <- increment
_accumulate-error buf, xright, ybelow, width, delta
}
#? show-errors buf, width, height, x, y
}
fn _accumulate-error buf: (addr array int), x: int, y: int, width: int, error: int {
var curr/ebx: int <- _read-buffer buf, x, y, width
curr <- add error
_write-buffer buf, x, y, width, curr
}
fn _read-buffer _buf: (addr array int), x: int, y: int, width: int -> _/ebx: int {
var buf/esi: (addr array int) <- copy _buf
var idx/ecx: int <- copy y
idx <- multiply width
idx <- add x
#? psd "i", idx, 5/fg, x, y
var result-a/eax: (addr int) <- index buf, idx
return *result-a
}
fn _write-buffer _buf: (addr array int), x: int, y: int, width: int, val: int {
var buf/esi: (addr array int) <- copy _buf
var idx/ecx: int <- copy y
idx <- multiply width
idx <- add x
#? draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, idx, 7/fg 0/bg
#? move-cursor-to-left-margin-of-next-line 0/screen
var src/eax: int <- copy val
var dest-a/edi: (addr int) <- index buf, idx
copy-to *dest-a, src
}
fn _read-byte-buffer _buf: (addr array byte), x: int, y: int, width: int -> _/eax: byte {
var buf/esi: (addr array byte) <- copy _buf
var idx/ecx: int <- copy y
idx <- multiply width
idx <- add x
var result-a/eax: (addr byte) <- index buf, idx
var result/eax: byte <- copy-byte *result-a
return result
}
fn _write-byte-buffer _buf: (addr array byte), x: int, y: int, width: int, val: byte {
var buf/esi: (addr array byte) <- copy _buf
var idx/ecx: int <- copy y
idx <- multiply width
idx <- add x
var src/eax: byte <- copy val
var dest-a/edi: (addr byte) <- index buf, idx
copy-byte-to *dest-a, src
}
fn show-errors buf: (addr array int), width: int, height: int, x: int, y: int {
compare y, 1
{
break-if-=
return
}
compare x, 0
{
break-if-=
return
}
var y/edx: int <- copy 0
{
compare y, height
break-if->=
var x/ecx: int <- copy 0
{
compare x, width
break-if->=
var error/ebx: int <- _read-buffer buf, x, y, width
psd "e", error, 5/fg, x, y
x <- increment
loop
}
move-cursor-to-left-margin-of-next-line 0/screen
y <- increment
loop
}
}
fn psd s: (addr array byte), d: int, fg: int, x: int, y: int {
#? {
#? compare y, 3
#? break-if-=
#? return
#? }
#? {
#? compare x, 4
#? break-if-<
#? return
#? }
draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, s, 7/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, d, fg 0/bg
}
# import a color ascii "pixmap" (each pixel consists of 3 shades of r/g/b from 0 to 255)
fn initialize-image-from-ppm _self: (addr image), in: (addr stream byte) {
var self/esi: (addr image) <- copy _self
var curr-word-storage: slice
var curr-word/ecx: (addr slice) <- address curr-word-storage
# load width, height
next-word in, curr-word
var tmp/eax: int <- parse-decimal-int-from-slice curr-word
var width/edx: int <- copy tmp
next-word in, curr-word
tmp <- parse-decimal-int-from-slice curr-word
var height/ebx: int <- copy tmp
next-word in, curr-word
# check color levels
{
tmp <- parse-decimal-int-from-slice curr-word
compare tmp, 0xff
break-if-=
abort "initialize-image-from-ppm: supports exactly 255 levels per rgb channel"
}
var dest/edi: (addr int) <- get self, max
copy-to *dest, tmp
# save width, height
dest <- get self, width
copy-to *dest, width
dest <- get self, height
copy-to *dest, height
# initialize data
var capacity/edx: int <- copy width
capacity <- multiply height
# . multiply by 3 for the r/g/b channels
var tmp/eax: int <- copy capacity
tmp <- shift-left 1
capacity <- add tmp
#
var data-ah/edi: (addr handle array byte) <- get self, data
populate data-ah, capacity
var _data/eax: (addr array byte) <- lookup *data-ah
var data/edi: (addr array byte) <- copy _data
var i/ebx: int <- copy 0
{
compare i, capacity
break-if->=
next-word in, curr-word
var src/eax: int <- parse-decimal-int-from-slice curr-word
{
var dest/ecx: (addr byte) <- index data, i
copy-byte-to *dest, src
}
i <- increment
loop
}
}
# import a color ascii "pixmap" (each pixel consists of 3 shades of r/g/b from 0 to 255)
fn render-ppm-image screen: (addr screen), _img: (addr image), xmin: int, ymin: int, width: int, height: int {
var img/esi: (addr image) <- copy _img
# yratio = height/img->height
var img-height-a/eax: (addr int) <- get img, height
var img-height/xmm0: float <- convert *img-height-a
var yratio/xmm1: float <- convert height
yratio <- divide img-height
# xratio = width/img->width
var img-width-a/eax: (addr int) <- get img, width
var img-width/ebx: int <- copy *img-width-a
var img-width-f/xmm0: float <- convert img-width
var xratio/xmm2: float <- convert width
xratio <- divide img-width-f
# esi = img->data
var img-data-ah/eax: (addr handle array byte) <- get img, data
var _img-data/eax: (addr array byte) <- lookup *img-data-ah
var img-data/esi: (addr array byte) <- copy _img-data
var len/edi: int <- length img-data
#
var one/eax: int <- copy 1
var one-f/xmm3: float <- convert one
var width-f/xmm4: float <- convert width
var height-f/xmm5: float <- convert height
var zero/eax: int <- copy 0
var zero-f/xmm0: float <- convert zero
var y/xmm6: float <- copy zero-f
set-cursor-position 0/screen, 0x20/x 0x20/y
{
compare y, height-f
break-if-float>=
var imgy-f/xmm5: float <- copy y
imgy-f <- divide yratio
var imgy/edx: int <- truncate imgy-f
var x/xmm7: float <- copy zero-f
{
compare x, width-f
break-if-float>=
var imgx-f/xmm5: float <- copy x
imgx-f <- divide xratio
var imgx/ecx: int <- truncate imgx-f
var idx/eax: int <- copy imgy
idx <- multiply img-width
idx <- add imgx
# . multiply by 3 for the r/g/b channels
{
var tmp/ecx: int <- copy idx
tmp <- shift-left 1
idx <- add tmp
}
# error info in case we rounded wrong and 'index' will fail bounds-check
compare idx, len
{
break-if-<
set-cursor-position 0/screen, 0x20/x 0x20/y
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgx, 3/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, imgy, 4/fg 0/bg
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, idx, 5/fg 0/bg
}
# r channel
var r: int
{
var src-a/eax: (addr byte) <- index img-data, idx
var src/eax: byte <- copy-byte *src-a
copy-to r, src
}
idx <- increment
# g channel
var g: int
{
var src-a/eax: (addr byte) <- index img-data, idx
var src/eax: byte <- copy-byte *src-a
copy-to g, src
}
idx <- increment
# b channel
var b: int
{
var src-a/eax: (addr byte) <- index img-data, idx
var src/eax: byte <- copy-byte *src-a
copy-to b, src
}
idx <- increment
# color-int = nearest-hsl(r, g, b)
var color-int: int
{
var h/ecx: int <- copy 0
var s/edx: int <- copy 0
var l/ebx: int <- copy 0
h, s, l <- hsl r, g, b
var tmp/eax: int <- nearest-color-euclidean-hsl h, s, l
copy-to color-int, tmp
}
#
var screenx/ecx: int <- convert x
screenx <- add xmin
var screeny/edx: int <- convert y
screeny <- add ymin
pixel screen, screenx, screeny, color-int
x <- add one-f
loop
}
y <- add one-f
loop
}
}
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