gtk:snapshot-push-composite (snaphshot op)

snapshot -- a gtk:snapshot object
op -- a gsk:porter-duff value for the Porter/Duff compositing operator to use

Until the first call to the gtk:snapshot-pop function, the mask image for the mask operation will be recorded. After that call, the child image will be recorded until the second call to the gtk:snapshot-pop function. Calling this function requires 2 subsequent calls to gtk:snapshot-pop function.

Since 4.22