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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Native image rotation
Date: Mon, 25 Feb 2019 05:32:36 +0200
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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In-reply-to: <jwvy36554wk.fsf-monnier+emacs@gnu.org> (message from Stefan
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> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Cc: emacs-devel@gnu.org
> Date: Sun, 24 Feb 2019 15:08:25 -0500
> 
> > Actually, I'm not sure I understand the question.  What do you mean by
> > "cache does post-rotation"?
> 
> I assume that the images go through various steps starting from the
> Elisp image descriptor and finishing with the final on-screen pixels
> being drawn.  My question was if, along this "pipeline", Emacs's image
> cache is placed before or after the rotation operation.

After.  And, assuming you rotate the same image N times, there's only
one cached entry of that at any given time.