Quote:
Originally Posted by jmseight
Hi kiri87,
I ran the demo and is is very good! My son loves it.
However, I don't think you need to use the dither algorithm because it is all black and white.
Maybe you can modify the demo so it shows dithering...
Thanks,
James
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Geekmaster formula 42 does a lot more than just dithering. It works on all eink kindles. It works for 4-bit and 8-bit framebuffers. It works for color 0 = white and for color 0 = black. It works on 6-inch and 9.7-inch displays. It has no branches (if else statements) so it is very fast and cache-friendly. It is fine to use it only for black and white. Dithered gray is just an added benefit.
I have a new modified formula 42 that takes color values 0-255 instead of 0-65, so it can be used directly with 8-bit images with no need to pre-scale the color values. It was published as part of "paldemo". It also works with non-linear dither tables, including a LCD 2.2-gamma table (screenshot provided in paldemo post).
I just ran your version. The dithered grays do look interesting on this demo. I like seeing my code grow in unexpected directions that are not on MY "to do" list. 
P.S. I am getting an occasional "sementation fault" error on this, which probably means that it tried to write past the end of the framebuffer (y > 799). Although there is no harm in this for a demo, it SHOULD be fixed in the next version (so this error does not end up in other code that borrowed from this, perhaps causing real damage in some other scenario -- better to just do it right).
