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Create soft, centered, scaled NSImage

I put a fixed size icon based on an image of arbitrary size in NSOutlineView using NSImageCell.

NSImageCell scales the image nicely, but I can't find a way to add extras around the scaled image. The lines look ugly before my eyes without indentation.

My first pass to fix this problem was to create a new image with a constant size, paste its borders to fill, and then use drawInRect: fromRect: operation: fraction: to draw a smaller version of the original icon.

This is great for square images. I would have guessed that in NSImage there would be a convenience method to draw a centered, constant-scaled version of the image in this rectangle, but I can not find it.

Obviously, I can calculate the corresponding rectangle with the same aspect ratio as the original image, but I would not reinvent the wheel ...

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Each code example I saw uses computation to populate. There are several categories of NSImage on CocoaDev that do this.

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