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

clean up some unseemly speckles 

Turns out they were a bug after all, and scaling the palette was just
making them more obvious. The bug: I was carefully clamping to 0xf0 to
avoid rounding later, but I forgot to do so for values between 0xf0 and
0xff. As a result, some values could round up past 0xff and turn black.
This commit is contained in:
Kartik K. Agaram 2021-07-13 16:59:19 -07:00
parent 42bb0922fe
commit 62a2afe0d8
1 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
img.mu
View File

@ -26,8 +26,7 @@ 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, 0xd0/y, 0x12c/width=300, 0xc8/height=200
render-pgm-image screen, img, 0x140/x, 0/y, 0x12c/width=300, 0xc8/height=200
render-image screen, img, 0/x, 0/y, 0x300/width, 0x300/height
}
fn load-image self: (addr image), data-disk: (addr disk) {
@ -484,7 +483,7 @@ fn dither-pgm-unordered _src: (addr image), _dest: (addr image) {
nearest-color <- copy 0
}
{
compare nearest-color, 0xff
compare nearest-color, 0xf0
break-if-<=
nearest-color <- copy 0xf0
}