Efficient clone + crop (or contain)

# Expected Behavior

Working on a Video Stream at 15fps I need to crop a part of each frame then resize it into a canvas using crop() or contain() that use crop underlaying

# Current Behavior

It works but it use about 100ms to process a 720P video.

# Failure Information (for bugs)

Not sure if it's a bug or a feature.

Actually I have to perform `img.clone().crop()` whereas it might be more efficient to add an option to crop() into a new image (the code would gather only the relevant pixels) ?