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better greyscale

This commit is contained in:
Kartik K. Agaram 2021-07-08 00:26:58 -07:00
parent 9c70f7c643
commit 0f29e61238
1 changed files with 8 additions and 2 deletions
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@ -299,8 +299,7 @@ fn render-pgm-image screen: (addr screen), _self: (addr image), xmin: int, ymin:
var src-a/eax: (addr byte) <- index data, i
var src/eax: byte <- copy-byte *src-a
var src-int/eax: int <- copy src
# shades of grey = just a non-zero luminance
var color/eax: int <- nearest-color-euclidean-hsl 0/hue, 0/saturation, src-int
var color/eax: int <- nearest-grey src-int
pixel screen, x, y, color
}
x <- increment
@ -313,6 +312,13 @@ fn render-pgm-image screen: (addr screen), _self: (addr image), xmin: int, ymin:
}
}
fn nearest-grey level-255: int -> _/eax: int {
var result/eax: int <- copy level-255
result <- shift-right 4
result <- add 0x10
return result
}
fn render-ppm-image screen: (addr screen), _self: (addr image), xmin: int, ymin: int, width: int, height: int {
var self/esi: (addr image) <- copy _self
var img-width-a/ecx: (addr int) <- get self, width