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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Native image rotation
Date: Sun, 24 Feb 2019 21:23:22 +0200
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> Date: Sun, 24 Feb 2019 21:13:15 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> > From: Stefan Monnier <monnier@iro.umontreal.ca>
> > Date: Sun, 24 Feb 2019 13:51:17 -0500
> > 
> > >> The idea was to generate them with Emacs once, and cache the rotated version.
> > > AFAIK, that's not what the feature does.  It rotates the specified
> > > image on the fly.  At least that's how image scaling works.
> > 
> > If Emacs's image cache does the caching post-rotation, that should
> > work OK.
> 
> AFAIR, it doesn't, at least not on all platforms.

Actually, I'm not sure I understand the question.  What do you mean by
"cache does post-rotation"?  A cache -- any cache -- just stores
something computed elsewhere.  How can a cache rotate anything?