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# draw a single line of text from x, y to xmax
# return the next 'x' coordinate
# if there isn't enough space, return 0 without modifying the screen
fn draw-text-rightward screen: (addr screen), text: (addr array byte), x: int, xmax: int, y: int, color: int -> _/eax: int {
var stream-storage: (stream byte 0x100)
var stream/esi: (addr stream byte) <- address stream-storage
write stream, text
# check if we have enough space
var xcurr/ecx: int <- copy x
{
compare xcurr, xmax
break-if->
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
loop
}
compare xcurr, xmax
{
break-if-<=
return 0
}
# we do; actually draw
rewind-stream stream
xcurr <- copy x
{
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, y, color
xcurr <- add 8 # font-width
loop
}
set-cursor-position screen, xcurr, y
return xcurr
}
fn draw-text-rightward-from-cursor screen: (addr screen), text: (addr array byte), xmax: int, color: int -> _/eax: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var result/eax: int <- draw-text-rightward screen, text, cursor-x, xmax, cursor-y, color
return result
}
# draw text in the rectangle from (xmin, ymin) to (xmax, ymax), starting from (x, y), wrapping as necessary
# return the next (x, y) coordinate in raster order where drawing stopped
# that way the caller can draw more if given the same min and max bounding-box.
# if there isn't enough space, return 0 without modifying the screen
fn draw-text-wrapping-right-then-down screen: (addr screen), text: (addr array byte), xmin: int, ymin: int, xmax: int, ymax: int, x: int, y: int, color: int -> _/eax: int, _/ecx: int {
var stream-storage: (stream byte 0x100)
var stream/esi: (addr stream byte) <- address stream-storage
write stream, text
# check if we have enough space
var xcurr/edx: int <- copy x
var ycurr/ecx: int <- copy y
{
compare ycurr, ymax
break-if->=
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
xcurr <- add 8 # font-width
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
}
loop
}
compare ycurr, ymax
{
break-if-<
return 0, 0
}
# we do; actually draw
rewind-stream stream
xcurr <- copy x
ycurr <- copy y
{
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
xcurr <- add 8 # font-width
compare xcurr, xmax
{
break-if-<
xcurr <- copy xmin
ycurr <- add 0x10 # font-height
}
loop
}
set-cursor-position screen, xcurr, ycurr
return xcurr, ycurr
}
fn draw-text-wrapping-right-then-down-over-full-screen screen: (addr screen), text: (addr array byte), x: int, y: int, color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- draw-text-wrapping-right-then-down screen, text, 0, 0, 0x400, 0x300, x, y, color # 1024, 768
return cursor-x, cursor-y
}
fn draw-text-wrapping-right-then-down-from-cursor screen: (addr screen), text: (addr array byte), xmin: int, ymin: int, xmax: int, ymax: int, color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-x/edx: int <- copy cursor-x
end-x <- add 8 # font-width
compare end-x, xmax
{
break-if-<
cursor-x <- copy xmin
cursor-y <- add 0x10 # font-height
}
cursor-x, cursor-y <- draw-text-wrapping-right-then-down screen, text, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color
return cursor-x, cursor-y
}
fn draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen: (addr screen), text: (addr array byte), color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- draw-text-wrapping-right-then-down-from-cursor screen, text, 0, 0, 0x400, 0x300, color # 1024, 768
return cursor-x, cursor-y
}
## Text direction: down then right
# draw a single line of text vertically from x, y to ymax
# return the next 'y' coordinate
# if there isn't enough space, return 0 without modifying the screen
fn draw-text-downward screen: (addr screen), text: (addr array byte), x: int, y: int, ymax: int, color: int -> _/eax: int {
var stream-storage: (stream byte 0x100)
var stream/esi: (addr stream byte) <- address stream-storage
write stream, text
# check if we have enough space
var ycurr/ecx: int <- copy y
{
compare ycurr, ymax
break-if->
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
ycurr <- add 0x10 # font-height
loop
}
compare ycurr, ymax
{
break-if-<=
return 0
}
# we do; actually draw
rewind-stream stream
ycurr <- copy y
{
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, x, ycurr, color
ycurr <- add 0x10 # font-height
loop
}
set-cursor-position screen, x, ycurr
return ycurr
}
fn draw-text-downward-from-cursor screen: (addr screen), text: (addr array byte), ymax: int, color: int -> _/eax: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var result/eax: int <- draw-text-downward screen, text, cursor-x, cursor-y, ymax, color
return result
}
# draw text down and right in the rectangle from (xmin, ymin) to (xmax, ymax), starting from (x, y), wrapping as necessary
# return the next (x, y) coordinate in raster order where drawing stopped
# that way the caller can draw more if given the same min and max bounding-box.
# if there isn't enough space, return 0 without modifying the screen
fn draw-text-wrapping-down-then-right screen: (addr screen), text: (addr array byte), xmin: int, ymin: int, xmax: int, ymax: int, x: int, y: int, color: int -> _/eax: int, _/ecx: int {
var stream-storage: (stream byte 0x100)
var stream/esi: (addr stream byte) <- address stream-storage
write stream, text
# check if we have enough space
var xcurr/edx: int <- copy x
var ycurr/ecx: int <- copy y
{
compare xcurr, xmax
break-if->=
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
ycurr <- add 0x10 # font-height
compare ycurr, ymax
{
break-if-<
xcurr <- add 8 # font-width
ycurr <- copy ymin
}
loop
}
compare xcurr, xmax
{
break-if-<
return 0, 0
}
# we do; actually draw
rewind-stream stream
xcurr <- copy x
ycurr <- copy y
{
var g/eax: grapheme <- read-grapheme stream
compare g, 0xffffffff # end-of-file
break-if-=
draw-grapheme screen, g, xcurr, ycurr, color
ycurr <- add 0x10 # font-height
compare ycurr, ymax
{
break-if-<
xcurr <- add 8 # font-width
ycurr <- copy ymin
}
loop
}
set-cursor-position screen, xcurr, ycurr
return xcurr, ycurr
}
fn draw-text-wrapping-down-then-right-over-full-screen screen: (addr screen), text: (addr array byte), x: int, y: int, color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- draw-text-wrapping-down-then-right screen, text, 0, 0, 0x400, 0x300, x, y, color # 1024, 768
return cursor-x, cursor-y
}
fn draw-text-wrapping-down-then-right-from-cursor screen: (addr screen), text: (addr array byte), xmin: int, ymin: int, xmax: int, ymax: int, color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- cursor-position screen
var end-y/edx: int <- copy cursor-y
end-y <- add 0x10 # font-height
compare end-y, ymax
{
break-if-<
cursor-x <- add 8 # font-width
cursor-y <- copy ymin
}
cursor-x, cursor-y <- draw-text-wrapping-down-then-right screen, text, xmin, ymin, xmax, ymax, cursor-x, cursor-y, color
return cursor-x, cursor-y
}
fn draw-text-wrapping-down-then-right-from-cursor-over-full-screen screen: (addr screen), text: (addr array byte), color: int -> _/eax: int, _/ecx: int {
var cursor-x/eax: int <- copy 0
var cursor-y/ecx: int <- copy 0
cursor-x, cursor-y <- draw-text-wrapping-down-then-right-from-cursor screen, text, 0, 0, 0x400, 0x300, color # 1024, 768
return cursor-x, cursor-y
}
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