def save_snapshot(self):
"""Creates and returns a snapshot of the surface
Snapshotting marks all the tiles of the surface as read-only,
then just shallow-copes the tiledict. It's quick. See
tile_request() for how new read/write tiles can be unlocked.
"""
sshot = _SurfaceSnapshot()
for t in itervalues(self.tiledict):
t.readonly = True
sshot.tiledict = self.tiledict.copy()
return sshot
def _delete_brush(self, b, replacement=None):
bm = self.app.brushmanager
for brushes in itervalues(bm.groups):
if b in brushes:
idx = brushes.index(b)
if replacement:
brushes[idx] = replacement
else:
del brushes[idx]
bm.brushes_changed(brushes)
assert b not in brushes, \
'Brush exists multiple times in the same group!'
if not b.delete_from_disk():
# stock brush can't be deleted
deleted_group = brushmanager.DELETED_BRUSH_GROUP
deleted_brushes = bm.get_group_brushes(deleted_group)
deleted_brushes.insert(0, b)
bm.brushes_changed(deleted_brushes)