Configuration option to keep the zoomed image from growing to larger than its largest size

[gingersoulrecords]

The problem

When I apply medium-zoom to all images in my (blogging) application, some images are smaller than the viewport at their largest size, but get zoomed to fit the viewport, which causes them to be blurred.

Solution

I would like a config option to 'cap' the image scale to the native width/height of the image (per its width/height attributes), keeping it vertically and horizontally centered above the overlay. If it's larger than the viewport, fill the viewport, but don't zoom it past its 'largest' size.

Implementation

Include the image’s width/height attributes in the scale math so that it scales up to its largest native size if it's smaller than the current viewport.

[gingersoulrecords]

Reference: the 'small image' example here: https://photoswipe.com/adjusting-zoom-level/#image-is-smaller-than-initial-and-secondary