On Thu, Nov 19, 2009 at 02:01:13PM +1030, David Gowers wrote: > On Thu, Nov 19, 2009 at 11:17 AM, James Cox <jaycox@xxxxxxxx> wrote: > > result = floor(input * opacity + g_random_double()); > > If you pregenerate a lookup table (say 256 entries), keep a counter > which cycles 0,1,2,....255,0,1,2,....255, and only add a random > integer to that counter at the start of every dab, you could get that > going at decent speeds. I have implemented this in (historical) release 0.5.1 of MyPaint. Using 8 bytes of precalculated noise; brush_dab.c line 120 in case anyone cares. I got sick of the noise, though. It tends to get visible when you use brushes that really need this correction. Not worth the effort I think. The better solution is to calculate in 16bpc, or use different brushes, or don't use incremental mode (MyPaint supports only incremental). See http://mypaint.intilinux.com/?p=19 for a sample. _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
