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From: "Gerd Möllmann" <gerd.moellmann@gmail.com>
To: Feng Shu <tumashu@163.com>
Cc: Emacs Devel <emacs-devel@gnu.org>
Subject: Re: "Final" version of tty child frames
Date: Wed, 23 Oct 2024 07:00:03 +0200	[thread overview]
Message-ID: <m2h693ifcc.fsf@gmail.com> (raw)
In-Reply-To: <m2ldyfig9g.fsf@gmail.com> ("Gerd Möllmann"'s message of "Wed, 23 Oct 2024 06:40:11 +0200")

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> Feng Shu <tumashu@163.com> writes:
>>
>>> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>>>
>>>> Feng Shu <tumashu@163.com> writes:
>>>>
>>>>> border do not work well when current buffer is CJK, maybe because CJK
>>>>> Char width is not 1
>>>>
>>>> Could you please send me a bit of CJK text so that I have something I
>>>> can test this with?
>>
>> Thanks!
>
> Hm, okay, but not sure how to fix that.
>
> The problem comes indeed from the root frame displaying characters that
> are more then 1 column wide, say N. When we output such a character to
> the terminal, the cursor moves by N columns. Emacs represents that in
> the glyph matrix by producing N glyphs for the character, all bu tthe
> first have a padding flag set. So we have
>
>   ... (C, 0) (C, 1) ...
>
> in the glpyh matrix, where C is the character, and the number is the
> padding flag.
>
> Now assume, for example, that the child frame is posititoned so that its
> left border where we want to display a '|' is in the column for the (C,
> 1).
>
> That can't work, because writing C to the terminal moves 2 columns and 
> will skip over the column where we want the '|' to appear.
>
> I think the same should happen, in principle, without borders. Haven't
> checked that though. Maybe we have to "clear the field" to the left and
> right of child frames in the root frame matrix so that wide characters
> don't interfere.

Another question is if there is something lurking with R2L? I have no
idea what terminals do in that case, but I'd guess Eli knows :-).



  reply	other threads:[~2024-10-23  5:00 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-10-22  4:46 "Final" version of tty child frames Gerd Möllmann
2024-10-22  5:29 ` Eli Zaretskii
2024-10-22  9:58   ` martin rudalics
2024-10-22 10:20     ` Eli Zaretskii
2024-10-22 14:01       ` martin rudalics
2024-10-22 14:23         ` Eli Zaretskii
2024-10-22 10:40     ` Gerd Möllmann
2024-10-22 11:43       ` Po Lu
2024-10-22 13:44       ` Eli Zaretskii
2024-10-22 14:01         ` Gerd Möllmann
2024-10-22 14:02       ` martin rudalics
2024-10-28  4:35   ` Jared Finder
2024-10-28  5:57     ` Gerd Möllmann
2024-10-22  7:34 ` Dr. Arne Babenhauserheide
2024-10-22  7:49   ` Gerd Möllmann
2024-10-22  7:49   ` Eli Zaretskii
2024-10-22  8:01 ` Eli Zaretskii
2024-10-22  8:21   ` Gerd Möllmann
2024-10-22  8:57     ` Eli Zaretskii
2024-10-22  9:42     ` Eli Zaretskii
2024-10-22 10:23       ` Gerd Möllmann
2024-10-22 13:35         ` Eli Zaretskii
2024-10-22 13:43           ` Gerd Möllmann
2024-10-22 13:55             ` Eli Zaretskii
2024-10-22 14:02               ` Gerd Möllmann
2024-10-22 14:40                 ` Eli Zaretskii
2024-10-22 19:19                   ` Paul Eggert
2024-10-23  3:18                     ` Gerd Möllmann
2024-10-22 10:43       ` Gerd Möllmann
2024-10-23  3:05 ` Feng Shu
2024-10-23  3:13   ` Gerd Möllmann
2024-10-23  3:25     ` Feng Shu
2024-10-23  3:36       ` Gerd Möllmann
2024-10-23  3:44         ` Feng Shu
2024-10-23  4:09           ` Gerd Möllmann
2024-10-23  4:40             ` Gerd Möllmann
2024-10-23  5:00               ` Gerd Möllmann [this message]
2024-10-23  7:49                 ` Eli Zaretskii
2024-10-23  8:12                   ` Gerd Möllmann
2024-10-23 11:04                   ` Gerd Möllmann
2024-10-23 17:23                     ` Eli Zaretskii
2024-10-23 17:52                       ` Gerd Möllmann
2024-10-23  6:54               ` Feng Shu
2024-10-23  7:25                 ` Gerd Möllmann
2024-10-23  7:28               ` Eli Zaretskii
2024-10-23  7:37                 ` Gerd Möllmann
2024-10-23  7:52                   ` Feng Shu
2024-10-23  8:07                     ` Gerd Möllmann
2024-10-23  9:07                       ` Feng Shu
2024-10-23  9:58                         ` Gerd Möllmann
2024-10-23  7:11   ` Eli Zaretskii
2024-10-26  8:15 ` Gerd Möllmann

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