This improves over the previous code for handling
snapshot objects and cutouts. Basically any opaque object
above a snapshot should be obscuring it. That is true
unless a crazy filter is applied, or the snapshot object
is itself the source of a map or proxy.
This also uses eina_tiler instead of a custom (and really
bad) algorithm to compute the obscure regions.
This make save() work on snapshot objects, provided the call
is done from inside render_post.
Also, this saves the filtered output of an image, rather than
its source pixels. Any call to save() on a filtered image must
be done from post-render as well.
Fixes T2102
@feature
Efl.Canvas.Snapshot and Efl.Canvas.Proxy are specialized
classes previously implemented as features of Evas.Image.
Note: this half of the work, as I suffered from a bad
merge and rebase with my work branch on top of master.
Jean-Philippe Andre
Tom Hacohen