push_composite
Description:
Until the first call to [method@Gtk.
Snapshot.pop], the mask image for the mask operation will be recorded.
After that call, the child image will be recorded until the second call to [method@Gtk.Snapshot.pop].
Calling this function requires 2 subsequent calls to pop.
Parameters:
| this |
a Snapshot |
| op |
The Porter/Duff compositing operator to use |