[CREATE] ORA topic presentation for Online LGM 2020

[InkLab App]

Hey Johann,

I think it would be great if we could adapt ORA to contain the features
needed to support the majority of what your program needs to save. Offhand,
I know the programs "mypaint" and "drawpile" also use ORA as their native
saving format.

Vector shapes already have general support, at least in the Krita
community. See my merge request here:
https://invent.kde.org/kde/krita/-/merge_requests/228  -- I think the main
issue is deciding what to do with them for programs that do not support
vectors. Provide a pre-rendered version along with the svg, or require
programs to at least be able to render SVG, or what? This is the main
discussion point but I agree that it would be a good step to bring these
shape layers into the standard at least to realize the goal of replacing
PSD feature wise.

Affine transformations are not difficult to support as masks, this was also
one of my considerations.

For 'layer effects' : do you mean, non destructive filters? If so, this was
a very interesting problem that I have been considering for a while, that
is, implementing arbitrary functions into a file format. IT seems very
difficult to do safely, but I did have a few ideas. I would love to hear
your thoughts on this. The same idea could be applied, in a more limited
scope, to define generalized layer filters.

Layer groups are supported by default in ORA, but if you don't use them
yet, you can just place all layers into the root group.

-Paul
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