From: Yuan Fu <casouri@gmail.com>
To: Perry Smith <pedz@easesoftware.com>
Cc: help-gnu-emacs@gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: How to get the actual face attribute?
Date: Mon, 22 Jun 2020 13:21:15 -0400 [thread overview]
Message-ID: <41A32155-634A-4D5A-A878-2F92E6761917@gmail.com> (raw)
In-Reply-To: <A08200A8-DD4D-4259-AF2F-1DEF87760BE6@easesoftware.com>
> On Jun 22, 2020, at 1:15 PM, Perry Smith <pedz@easesoftware.com> wrote:
>
>
>
>> On Jun 22, 2020, at 12:00 PM, Yuan Fu <casouri@gmail.com <mailto:casouri@gmail.com>> wrote:
>>
>>
>>
>>> On Jun 21, 2020, at 11:54 AM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>>>
>>>> When writing my package I need to get height of the face at point.
>>>
>>> Note that there may be simultaneously several different such heights if
>>> point is shown simultaneously in different frames.
>>>
>>
>> Thanks. Unfortunately I think I asked an x-y question. What I really want to know is the width of the glyph and I thought I can just multiply the height factor to the original width of the glyph. It seems not to be the case. The multiplied result doesn’t match with the width on glass. More precisely :height * glyph width != posn of point after - posn of point. Is this expected?
>>
>> Also I can’t use posn for calculation since sometimes the text might not be on screen.
>
> It might help to explain what the bigger objective is.
I have a package that aligns org tables even for variable pitch text, CJK text, images, etc are in the table:
Some one reported that when they change the text size with text-scale-adjust, the alignment are messed up. That’s because the package aligns by calculating the pixel width of each cell, and when the text size are adjusted that width is no accurate anymore. I’m using this function to calculate the width of a glyph (which adds up to the width of a cell):
(let* ((p (or point (point))))
(if (eq (char-after point) ?\t)
(valign--tab-width (font-at p))
;; (font-at 0 nil (buffer-substring p (1+ p))) doesn’t work, the
;; font is sometimes wrong. (font-at p) doesn’t work, because
;; it requires the buffer to be visible.
(aref (aref (font-get-glyphs (font-at p) p (1+ p)) 0) 4)))
Yuan
next prev parent reply other threads:[~2020-06-22 17:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-21 4:01 How to get the actual face attribute? Yuan Fu
2020-06-21 14:52 ` Eli Zaretskii
2020-06-21 14:55 ` Yuan Fu
2020-06-21 15:03 ` Eli Zaretskii
2020-06-21 15:54 ` Stefan Monnier
2020-06-22 17:00 ` Yuan Fu
2020-06-22 17:15 ` Perry Smith
2020-06-22 17:21 ` Yuan Fu [this message]
2020-06-22 18:47 ` Eli Zaretskii
2020-06-22 19:07 ` Yuan Fu
2020-06-22 18:56 ` Stefan Monnier
2020-06-22 19:10 ` Yuan Fu
2020-06-22 19:49 ` Stefan Monnier
2020-06-22 19:54 ` Yuan Fu
2020-06-22 21:05 ` Stefan Monnier
2020-06-22 21:14 ` Emacs hackers all around the world (was: Re: How to get the actual face attribute?) Emanuel Berg via Users list for the GNU Emacs text editor
2020-06-24 4:13 ` How to get the actual face attribute? Yuan Fu
2020-06-22 21:27 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-06-24 4:12 ` Yuan Fu
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