Adds ability to display an image in a window using sdl2 #298
Thanks for this - should be a very useful feature.
I won't have time to review this properly until the weekend, but I did try it out locally and one thing that surprised me was that I could only show one image at a time - is it easy to add support for showing multiple windows at the same time? (So that e.g. I can view the input image, some intermediate, and the result side by side.)
I would prefer to add the ability to create multiple image windows in another pull request. Having a way to display a single image is sufficient for some use cases and multiple windows satisfies another use case.
Also if you have mac testing it on that would be useful because I can only test on ubuntu and windows 10 for the time being.