--- Begin Message ---
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Subject: |
26.3; Won't display Big5 characters using Xft |
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Date: |
Fri, 13 Mar 2020 15:47:57 -0700 |
My emacs (which is compiled with X11 and Xft, but not GTK or NextStep)
won't display Big5-encoded characters; the easiest way to see this is:
% emacs -Q
`C-h h'
`C-s big5('
On my system, the glyphs displayed are from the LastResort font.
After digging around, I think I know why it happens, and how to fix it.
I can give details on what's going on, but the fix is simple - change a
line in ftfont.c:
--- ../../ftfont.old.c 2020-03-11 14:57:35.000000000 -0700
+++ ../../ftfont.new.c 2020-03-11 14:57:44.000000000 -0700
@@ -108,7 +108,7 @@
{ "iso8859-15", { 0x00A0, 0x00A1, 0x00D0, 0x0152 }},
{ "iso8859-16", { 0x00A0, 0x0218}},
{ "gb2312.1980-0", { 0x4E13 }, "zh-cn"},
- { "big5-0", { 0xF6B1 }, "zh-tw" },
+ { "big5-0", { 0x9C21 }, "zh-tw" },
{ "jisx0208.1983-0", { 0x4E55 }, "ja"},
{ "ksc5601.1985-0", { 0xAC00 }, "ko"},
{ "cns11643.1992-1", { 0xFE32 }, "zh-tw"},
Explanation: To check if a fontconfig font can support a character set,
Emacs uses a set of unique characters (all in Unicode), in
fcfont.c:fc_charset_table. However, the character given for the big5-0
character set (0xF6B1) is *not* Unicode, it is big5. Changing it to the
equivalent Unicode character (0x9C21) fixes the problem - Xft
successfully finds fonts other than LastResort to display the big5
characters.
Extra note: The file macfont.m has a similar mapping table, called
cf_charset_table. It has this line for big5:
{ "big5-0", { /* 0xF6B1 in ftfont.c */ 0x4EDC }, CFSTR ("zh-Hant") },
It's clear that the maintainer of this file saw the problem and fixed it
in macfont.m, but didn't fix it in ftfont.c. I have a version of emacs
compiled with NextStep stuff, and sure enough, it displays big5
characters correctly.
Hope this helps! If you have any questions, let me know.
Brian
----------------------------------------------------------------------
In GNU Emacs 26.3 (build 1, x86_64-apple-darwin10.8.0, X toolkit, Xaw scroll
bars)
of 2020-02-23 built on Brian-Schacks-Computer.local
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
Recent messages:
nsmenu.m
nsselect.m
nsterm.m
Mark saved where search started
Making completion list...
Mark saved where search started
Mark set [2 times]
Mark saved where search started [2 times]
Finding changes in /Users/schack/Projects/Emacs/emacs-26.3/src/coding.c...done
Finding changes in /Users/schack/Projects/Emacs/emacs-26.3/src/ftfont.c...done
Configured using:
'configure --with-x-toolkit=athena --without-ns --with-gnutls=no
--with-xft'
Configured features:
XPM JPEG TIFF GIF PNG NOTIFY ACL LIBXML2 FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM THREADS
Important settings:
value of $LC_CTYPE: en_GB.UTF-8
locale-coding-system: utf-8-unix
Major mode: C/*l
Minor modes in effect:
diff-auto-refine-mode: t
TeX-PDF-mode: t
shell-dirtrack-mode: t
desktop-save-mode: t
show-paren-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
abbrev-mode: t
Load-path shadows:
None found.
Features:
(shadow fortune emacsbug sendmail whitespace diff-mode vc face-remap
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custom widget hashtable-print-readable backquote threads kqueue
dynamic-setting font-render-setting x-toolkit x multi-tty
make-network-process emacs)
Memory information:
((conses 16 2080534 22721)
(symbols 48 55526 2)
(miscs 40 1884 1057)
(strings 32 383670 8294)
(string-bytes 1 13035276)
(vectors 16 76063)
(vector-slots 8 1577357 247498)
(floats 8 446 356)
(intervals 56 91697 663)
(buffers 992 123))
--
NAPOLEON: What shall we do with this soldier, Guiseppe? Everything he
says is wrong.
GUISEPPE: Make him a general, Excellency, and then everything he says
will be right.
- G. B. Shaw, "The Man of Destiny"
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#40057: 26.3; Won't display Big5 characters using Xft |
|
Date: |
Sat, 14 Mar 2020 10:33:13 +0200 |
> From: Brian Schack <address@hidden>
> Date: Fri, 13 Mar 2020 15:47:57 -0700
> Z-USANET-MsgId: XID668ycmwWB1216X32
>
> My emacs (which is compiled with X11 and Xft, but not GTK or NextStep)
> won't display Big5-encoded characters; the easiest way to see this is:
>
> % emacs -Q
> `C-h h'
> `C-s big5('
>
> On my system, the glyphs displayed are from the LastResort font.
>
> After digging around, I think I know why it happens, and how to fix it.
> I can give details on what's going on, but the fix is simple - change a
> line in ftfont.c:
Thanks, fixed.
--- End Message ---