[LukeLambert]

Thank you for following up. IMHO, object-fit is not the right model for server-side image manipulation, since its behavior is only specified when both width and height are supplied. I've also never seen a real world use case for stretching, squeezing, padding, or enlarging images on the server. That should be done on the client. I mentioned some of the same issues on the Cloudflare forum when they announced an image resizing product based on object-fit.

I believe all resizing operations a user might realistically want can be achieved with three parameters: width, height, and crop. Additional x and y parameters (floats between 0.0 and 1.0) could be used for setting the focal point of the crop box.

Examples:

  source.jpg?width=400

Iff source width is greater than 400px, scale down to 400px wide.

  source.jpg?height=300

Iff source height is greater than 300px, scale down to 300px high.

  source.jpg?width=400&height=300

Iff source width is greater than 400px or source height is greater than 300px, scale down to fit within a 400px by 300px box.

  source.jpg?width=400&height=300&crop=true

Crop source to a 4x3 aspect ratio. Iff result is larger than 400px by 300px, scale down.