GNU bug report logs - #67533
SVG images confound position pixel measurements

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Message #47 received at 67533 <at> debbugs.gnu.org (full text, mbox):

From: JD Smith <jdtsmith <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>,
 67533 <at> debbugs.gnu.org
Subject: Re: bug#67533: SVG images confound position pixel measurements
Date: Fri, 1 Dec 2023 17:04:59 -0500

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> On Dec 1, 2023, at 2:08 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> Thanks, but I need recipes I could reproduce on my system, and
> reproduce relatively easily.  

Please find a stand-alone reproduction code which can separately test both text-property and overlay inline SVGs at this gist <https://gist.github.com/jdtsmith/ad765047a6afe20f353de573d8c07da9>.  See the header for instructions.  

You should get many reported errors in which the size above is larger than expected, but as you narrow your frame and re-run the check, you’ll eventually find some images reporting 0 height above.  Interestingly, for the same frame width, overlays produce some of the same but overall fewer errors than text-properties, using precisely the same images for ‘display.

The report also reveals that the posn-x-y of the mis-reporting images is usually wrong, which is at least partially responsible for incorrect pixel position measurements.  

The one bug in my original org file I haven’t been able to reproduce is random text characters (usually on a line with a bad image) misreporting pixel measurements.  But I could certainly imagine how in more complex files this could get out of sync. 

BTW, I haven’t tested it, but I do not think this misbehavior is specific to SVG images.

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