Minimum width and height in pixels

[monsieurtanuki]

In my app, I'm not supposed to crop into too small a picture, because the cropped image will then be rejected by the server I upload to.
In my particular case, we have a minimum width and a minimum height. It's even more complicated, the dimensions are ok if width >= minimumWidth OR height >= minimumHeight.

How could we implement those limits in crop_image?
Perhaps we should add a method to the controller, null by default, that checks if the dimensions are OK and recomputes the new dimensions if needed.
A method to be implemented by the app developer if needed in each specific case, for more flexibility.

cf. openfoodfacts/smooth-app#4219

[deakjahn]

Yes, an additional field (maybe not a method, just a field) would be good.