[WIP] Add support to save apng

[typemytype]

No description provided.

[typemytype]

some testing needs to be added

[typemytype]

argl tests are failing...

[justvanrossum]

Are you sure you can't leverage Pillow's apng support more instead of implementing all this low level stuff?

https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#apng-sequences

[typemytype]

DrawBot does not embed PIL, we only use it for testing.

(it worked here locally)

[typemytype]

reading all the errors:

With .gif we support:

• single frame -> static .gif
• multiple frame -> animated .gif

if DrawBot does the same for png/apng, lots of scripts will generate animated pngs instead of the png of the last frame only. That is what the tests traceback indicate.

possible solutions:

• fix all test by adding a pageNumber argument when a static png is required
• add a additional animate flag in saveImage("myPath.png", animate=True), different from the .gif behavior (so .gif should change)

[justvanrossum]

(Need to think about the api consequences)

There’s no reason we couldn’t bundle Pillow, no?