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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Native image rotation
Date: Mon, 25 Feb 2019 05:36:46 +0200
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> Date: Sun, 24 Feb 2019 23:22:28 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: emacs-devel@gnu.org
> 
> And I guess we maybe wouldn’t have to worry about clearing under the
> image any more in X: rotating can leave transparent sections.
> 
> But the maths is performed only once, when the image is loaded, so I
> doubt we’d find a significant improvement.

It's indeed the clearing that bothered me, and also the increase in
the screen estate taken by a rotated image.  I'm asking whether it's
worth it.