GNU bug report logs - #68006
30.0.50; Image-mode speed

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From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 68006 <at> debbugs.gnu.org
Subject: bug#68006: 30.0.50; Image-mode speed
Date: Mon, 25 Dec 2023 11:34:49 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

[...]

>> The call to 'image-flush' defeats the entire purpose of having an image
>> cache.  If I remove it, moving from previous/next is much more faster
>> (once this image is in the cache, of course).  Do you know why this code
>> is like that?
>
> Look at its Git history, and look up discussions and bugs from those
> times.
>
> AFAIR, one problem is that images can change behind our backs.  But
> maybe there are other reasons.

So I trace this call back to dc255b24e30a (Chong Yidong, 2007-05-21).  At
that time 'image-flush' was called 'image-refresh' with the same
functionality of uncaching an image given its spec.

Before that, the whole image cache was cleared (fcfc4732e0d9, Chong
Yidong, 2006-02-09).  I did not find a bug reference and I still don't
understand why it is/was needed.
-- 
Manuel Giraud

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