akkartik
/
mu
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

get rid of our ugly rounding code 

It turns out "truncating" the last 4 bits is actually more accurate,
because it divides up the palette evenly. Before:

  0-7 -> 0
  8-0x17 -> 1
  0x18-0x27 -> 2
  ...
  0xd8-0xe7 -> 0xe
  0xe8-0xff -> 0xf

The first interval is just 8 shades, and the final interval is 24
shades.
This commit is contained in:
Kartik K. Agaram 2021-07-13 17:00:55 -07:00
parent 62a2afe0d8
commit 272432ce75
1 changed files with 1 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
img.mu
View File

@ -487,14 +487,7 @@ fn dither-pgm-unordered _src: (addr image), _dest: (addr image) {
break-if-<=
nearest-color <- copy 0xf0
}
# . round to nearest multiple of 0x10
{
var tmp/ecx: int <- copy nearest-color
tmp <- and 0xf
compare tmp, 8
break-if-<
nearest-color <- add 8
}
# . truncate last 4 bits
nearest-color <- and 0xf0
# error -= (nearest-color << 16)
{