On 11/10/19 5:23 AM, Dan Hitt via gimp-developer-list wrote:
The other hole is that i find that so far i cannot read and write a
pixel.
From my experiments:
- start an "undo group": this marks the image "dirty"
- attach an "undoable" parasite
- end the undo group and exit
At that point if you list the parasites you find the one that was added
If you then Ctrl-Z and list the parasites the added parasite is gone.
Actual Python code used in the Pyhon console:
>>> # Assumes you have only a single image loaded
>>> image=gimp.image_list()[0]
>>> # when you enter the line below, the title bar gets an '*'
indicating a dirty image
>>> image.undo_group_start()
>>> Check dirtiness with API
>>> image.dirty
True
>>> p=gimp.Parasite('foo',PARASITE_UNDOABLE,'bar')
>>> image.parasite_attach(p)
>>> image.undo_group_end()
>>> image.parasite_list()
('gimp-comment', 'jpeg-settings', 'foo')
>>> Now undo with Ctrl-Z in the image window, and retest the parasites:
>>> image.parasite_list()
('gimp-comment', 'jpeg-settings')
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