[cairo] Compositing benchmarks

Carl Worth cworth at cworth.org
Mon Mar 5 08:55:16 PST 2007

On Mon, 5 Mar 2007 05:39:37 GMT, "jose_ogp at juno.com" wrote:
> 	It's curious to me that cairo puts so much emphasis on
> the 'accuracy' of compositing calculations - variations of which
> people are unable to discern - and yet seems to put much less
> emphasis on the 'accuracy' of scaling results - variations of
> which people note as giving considerable differences.

Cairo's downscaling implementation is an embarrassment.

You're correct to note that its quality is decidedly inferior to
almost all other results obtainable with cairo.

> 	Obviously there's a reason for this seeming disparity
> -- possibly it's the desire to have a single unified method for
> dealing with transforms... But I would say that this is an area
> that could use more looking into.

I think the reason is simply that we haven't gotten around to fixing
it yet. I'd love to see someone implement a software "mipmap"-like
approach for image scaling. It would eliminate one of the few
visual-quality warts still left in cairo.

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