Follow-up Comment #4, bug #18421 (project mypaint):
Have a look: http://maxy.homeip.net/misc/save_ora_profile.png
We don't use render_as_pixbuf() for any significant work while saving,
because it would allocate too much memory. And save_png_fast_progressive() is
already "chunked" by tile-scanline, and we could make the chunks shorter
without much effort.
This "only" leaves a the work to ensure that all other document/layer data
(transparency, strokemap, background...) is copied to safety for background
processing.
As you probably know, compressing the strokemap is already chunked (you don't
notice a thing of the processing when you are painting).
"What's python for call/cc again" - I don't understand what you mean with
that.
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