GNU bug report logs - #69602
29.1; Image :map should adjust with :scale and :rotation

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Message #11 received at 69602 <at> debbugs.gnu.org (full text, mbox):

From: Joseph Turner <joseph <at> breatheoutbreathe.in>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 69602 <at> debbugs.gnu.org, stephen.berman <at> gmx.net, juri <at> linkov.net
Subject: Re: bug#69602: 29.1; Image :map should adjust with :scale and
 :rotation
Date: Wed, 06 Mar 2024 23:14:21 -0800

Eli Zaretskii <eliz <at> gnu.org> writes:
> The ELisp manual says about :map:
>
>      Note that the map's coordinates should reflect the displayed image
>      after all transforms have been done (rotation, scaling and so on),
>      and also note that Emacs (by default) performs auto-scaling of
>      images, so to make things match up, you should either specify
>      ‘:scale 1.0’ when creating the image, or use the result of
>      ‘image-compute-scaling-factor’ to compute the elements of the map.
>
> Can this technique help?

Thank you for your help!

When the user runs `image-increase-size', where should third-party code
recompute :map to fit the new image scale?

There's no `image-after-change-size-hook' nor `image-after-rotate-hook'.

Joseph

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