Adjust for height of image rather than width?

[reox]

I have configured the default size of the images to fit the width of the whole available space, i.e., 1140px width. That works fine for most photos and on reasonable large display.
Today I viewed my gallery on a very old laptop with only 1366×768px resolution and here I can typically only see a third of the photo's height.
Thus, my question is: Is there an option to dynamically scale the photos by height and then by width?