Martin,
> If you provide a patch that improves Color mode compositing when using
> GEGL, I would be happy to review it.
Alas, all I can provide is the algorithm, I'm not a C or C++ coder.
> We can't do this change in native GIMP because it would break rendering
> of XCF files that relies on the old behavior.
>
> We take the opportunity to fix this when we transition to GEGL where we
> have done other non-compatible changes with regards to layer
> compositing, that's why the fix should be in the GEGL parts of GIMP.
I thought that it had been decided the existing GIMP Color mode was broken, so
"files relying on old behaviour" is not an issue. It wouldn't take much to make
it clear in release notes of the update that the new Color mode works better and
old files will look different. Those who rely on old functionality can refrain
from upgrading - this has always been the case with software. I find it
frustrating and specious that the "old behaviour" argument is put forward at all
when essential improvements are at stake.
On the other hand, I understand you have other good reasons to go the GEGL
route. That's fine, except it will take a long time to regain the functionality
GIMP already has, namely multi-threading. It's for that reason that I think
relatively simple solutions in the core are still worthwhile.
Once again, sorry I can't contribute code, I really wish I could.
Best,
Charlie
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