I just compiled master today to play around with the high bit depth
support. As has been mentioned, it's broken :o)
I seem to be running into two problems:
1) It seems like the rendering has some variety of race conditions and
mipmap-looking caching problems. Any suggestions for how to debug
these, things to try, or files to look at? One issue I've seen
repeatedly is that the image looks mostly-ok at <= 50% zoom. The
top-left tile will be wrong. When I move above 50% zoom, it looks like
the entire image is rendered as a zoomed-in version of that incorrect
top-left tile.
2) It's horrifically slow :o) I've never actually gotten a profiler to
work on my machine. Anyone have any suggestions for bits that could use
some optimization? Especially bits that someone who is good at C but
unfamiliar with the new codebase could take a look at?
In particular, is there anything I can do to make GIMP/GEGL take
advantage of the multiple cores on my machine? It only ever seems to
use one, which is a waste, because I've got 7 other cores I paid money
for just for GIMP (and other image processing).
In sum, I already have images that could benefit from >8bit processing,
so I'd like the future to be here sooner rather than later. Please tell
me how to help make that happen. Maslow's triangle dictates that I must
work on problems 1 or 2, if at all possible.
--xsdg
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