CHGenerator/Sources/Generator/Extensions/NSSize+Extensions.swift

import Foundation

extension NSSize {

    func scaledDown(to desiredWidth: CGFloat) -> NSSize {
        if width == desiredWidth {
            return self
        }

        if width < desiredWidth {
            // Don't scale larger
            return self
        }

        let height = (height * desiredWidth / width).rounded(.down)
        return NSSize(width: desiredWidth, height: height)
    }
}

extension NSSize {

    var ratio: CGFloat {
        guard height != 0 else {
            return 0
        }
        return width / height
    }
}