GNU bug report logs - #77171
31.0.50; Some lines in etc/HELLO display with large height on MS-Windows

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Message #36 received at 77171-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Cecilio Pardo <cpardo <at> imayhem.com>
Cc: 77171-done <at> debbugs.gnu.org
Subject: Re: bug#77171: 31.0.50; Some lines in etc/HELLO display with large
 height on MS-Windows
Date: Wed, 23 Apr 2025 17:25:19 +0300

> Date: Mon, 21 Apr 2025 20:53:35 +0200
> From: Cecilio Pardo <cpardo <at> imayhem.com>
> 
> The attached patch examines the actual glyph's outline with DirectWrite 
> to compute exact values for ascent and descent and should solve the 
> problem for any font. Specifically, Sans Serif Collection works well 
> now, and everything on HELLO.txt looks good on my system.
> 
> This adds some overhead, but I didn't find it noticeable.  In case 
> someone does, we could cache measurements as the GDI backend does.
> 
> When computing the bounding box for bezier curves, I just used minmax 
> values for start/end and control points, instead of actually evaluating 
> the curve.  This reduces the overhead and loses some precision, but I 
> didn't see any real difference.

Thanks, this solves the problems, so I've now installed this on
master, and I'm therefore closing the bug.

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