Crop active picture to cricle

Hello, i have active picture to load photo user. The question is, how to crop photo image to circle?

i don't use surface object because as i know surface object doesn't work for mobile version, cmiiw.

anyone?

Update 1:
- i make a new layer with effect to ADD so i can make 2 active object with hole in the center.
Now the question, how to copy the hole so i can make photo image with ellipse border (circle) not square?
When i work in construct 2, i used paster plugin, so i can paste object to the new other object.

Looki's shadder working nicely unfortunately some research looki shader didn't work on mobile device. So, anyone how to solve this?

nb: sorry for my english

I'm not completely sure I understand your needs,
if not mistaken, you would add some sort of masking to an active picture to give it a circular shape
because, at least to my knowledge -and without surface extension- active pictures can't be dynamically cropped.

It would be crucial to know how much "freedom" you have above this masking in regards to its background,
say you have a one-coloured background, that would be obviously really easy to implement,
but I guess you have a not-fixed nor tiled background, so you can't pre-determine a fitting mask to apply?

Regarding effects,
you can apply add-subtract effect to single active objects too,
I think that would be handyer to implement for this purpose than having the whole layer effected.