From: Eli Zaretskii <eliz@gnu.org>
To: 黄建忠 <jianzhong.huang@i-soft.com.cn>
Cc: kanru@kanru.info, emacs-devel@gnu.org
Subject: Re: A patch for enforcing double-width CJK character display
Date: Thu, 12 Apr 2012 17:27:18 +0300 [thread overview]
Message-ID: <83ehrt3u0p.fsf@gnu.org> (raw)
In-Reply-To: <4F86BA0F.4080301@i-soft.com.cn>
> Date: Thu, 12 Apr 2012 19:18:39 +0800
> From: 黄建忠 <jianzhong.huang@i-soft.com.cn>
> CC: kanru@kanru.info, emacs-devel@gnu.org
>
> >> Can anybody provide a clue how to catch the new width of default font
> >> via FRAME_PTR when scale happened?
> > I don't think there is a way to do that, if all you have is the frame
> > pointer. text-scale-mode does not modify the frame's default font, it
> > remaps the 'default' face to another face which specifies a larger or
> > a smaller font. So the way to find the width of the font after
> > scaling is to get hold of the font itself, or of the face to which
> > 'default' was remapped. Then you can use FONT_WIDTH, I think (but I
> > didn't test this).
> I can get the default font(the first font loaded when frame be
> initialized) via FRAME_FONT, it's great that it can not be changed after
> first font loaded.
> But I still can not get the current width after scale, since the props
> of FRAME_FONT also not be changed.
> [...]
> I noticed there were some global Lisp_Object such as
> "f_Vface_font_rescale_alist"/"f_Vface_remapping_alist"/"f_Vface_new_frame_defaults",
> maybe I can use them, Hope so.
This will retrieve the numerical ID of the default face on frame F:
int id = lookup_basic_face (F, DEFAULT_FACE_ID);
lookup_basic_face consults f_Vface_remapping_alist. If the value of
id above is different from DEFAULT_FACE_ID, that means the default
face was remapped. Then you can get the remapped face like this:
struct face *face = FACE_FROM_ID (F, id);
Now the font of the face is available as
struct font *font = face->font;
And I think FONT_WIDTH (font) will give you the width you want to use
instead of FRAME_COLUMN_WIDTH.
Again, this is 100% untested. Good luck!
next prev parent reply other threads:[~2012-04-12 14:27 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4F85A138.6090900@i-soft.com.cn>
2012-04-11 15:48 ` A patch for enforcing double-width CJK character display Kan-Ru Chen
2012-04-11 16:16 ` 黄建忠
2012-04-12 8:56 ` 黄建忠
2012-04-12 9:53 ` Eli Zaretskii
2012-04-12 11:18 ` 黄建忠
2012-04-12 14:27 ` Eli Zaretskii [this message]
2012-04-12 17:56 ` 黄建忠
2012-04-12 20:33 ` Stefan Monnier
[not found] ` <4F8782C8.2030005@i-soft.com.cn>
2012-04-13 11:42 ` 黄建忠
2012-04-13 12:03 ` 黄建忠
2012-04-13 13:27 ` Stefan Monnier
2012-04-15 5:10 ` Miles Bader
2012-04-15 13:27 ` 黄建忠
2012-04-15 16:08 ` William Xu
2012-04-15 22:19 ` Miles Bader
2012-04-16 0:51 ` 黄建忠
2012-04-16 5:27 ` Miles Bader
2012-04-16 5:40 ` 黄建忠
2012-04-16 6:37 ` 黄建忠
2012-04-16 9:21 ` 黄建忠
2012-04-17 2:16 ` 黄建忠
2012-04-17 0:13 ` Miles Bader
2012-04-17 0:39 ` Miles Bader
2012-04-17 2:00 ` 黄建忠
2012-04-17 2:30 ` Miles Bader
2012-04-17 3:00 ` 黄建忠
2012-04-17 4:08 ` Miles Bader
2012-04-17 4:56 ` Werner LEMBERG
2012-04-17 5:02 ` 黄建忠
2012-04-17 6:33 ` Miles Bader
2012-04-17 7:03 ` Werner LEMBERG
2012-04-17 5:52 ` Miles Bader
2012-04-17 6:10 ` 黄建忠
2012-04-17 7:02 ` Miles Bader
2012-04-17 8:06 ` Werner LEMBERG
2012-04-17 8:25 ` Miles Bader
2012-04-17 9:06 ` Werner LEMBERG
2012-04-17 8:51 ` 黄建忠
2012-04-17 6:45 ` Werner LEMBERG
2012-04-17 9:07 ` James Cloos
2012-04-17 9:27 ` 黄建忠
2012-04-17 1:47 ` 黄建忠
2012-04-18 6:54 ` Kenichi Handa
2012-04-18 8:13 ` 黄建忠
2012-04-18 13:58 ` Miles Bader
2014-04-28 5:35 JunJie Nan
2014-04-29 5:39 ` Stefan Monnier
2014-04-29 6:36 ` Jan D.
2014-04-29 8:16 ` Thien-Thi Nguyen
2014-04-29 20:41 ` Liang Wang
-- strict thread matches above, loose matches on Subject: below --
2014-04-30 2:00 Hui Liu
2014-04-30 17:08 ` Liang Wang
2014-10-04 3:26 Feng Shu
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