使用默认字体会导致中文不渲染

[lygamac]

示例片段：

\documentclass{ctexart}

\begin{document}
con中文tents.
\end{document}

以XeTex编译以上代码的结果是：

使用\usepackage{xeCJK}也是同样的结果，改字体的话能解决。

（很久）以前编译出来的没有问题。不知道是什么时候导致的问题。

安装的是上流3月20日打的最新包（aur 的 FandolSong 包也装过，没有变化。本身就内置了的话又没缺失的报错应该不是字体的问题）：

local/texlive-bibtexextra 2021.62705-1 (texlive-most)
    TeX Live - Additional BibTeX styles and bibliography databases
local/texlive-bin 2021.59745-2
    TeX Live binaries
local/texlive-core 2021.62793-1 (texlive-most)
    TeX Live core distribution
local/texlive-fontsextra 2021.62623-1 (texlive-most)
    TeX Live - all sorts of extra fonts
local/texlive-formatsextra 2021.62145-1 (texlive-most)
    TeX Live - collection of extra TeX 'formats'
local/texlive-games 2021.62102-1 (texlive-most)
    TeX Live - Setups for typesetting various board games, including chess
local/texlive-humanities 2021.61878-1 (texlive-most)
    TeX Live - LaTeX packages for law, linguistics, social sciences, and humanities
local/texlive-langchinese 2021.62313-1 (texlive-lang)
    TeX Live - Fonts and macro packages to typeset Chinese texts
local/texlive-latexextra 2021.62806-1 (texlive-most)
    TeX Live - Large collection of add-on packages for LaTeX
local/texlive-music 2021.62509-1 (texlive-most)
    TeX Live - Music typesetting packages
local/texlive-pictures 2021.62760-1 (texlive-most)
    TeX Live - Packages for drawings graphics
local/texlive-pstricks 2021.61917-1 (texlive-most)
    TeX Live - Additional PSTricks packages
local/texlive-publishers 2021.62814-1 (texlive-most)
    TeX Live - LaTeX classes and packages for specific publishers
local/texlive-science 2021.62659-1 (texlive-most)
    TeX Live - Typesetting for mathematics, natural and computer sciences

编译输出：

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(/usr/share/texmf-dist/tex/latex/ctex/fontset/ctex-fontset-fandol.def

Package fontspec Warning: Font "FandolSong-Regular" does not contain requested
(fontspec)                Script "CJK".

)) (/usr/share/texmf-dist/tex/latex/ctex/config/ctex.cfg)
No file 1.aux.
[1] (./1.aux) )
Output written on 1.pdf (1 page).
Transcript written on 1.log.

日志：

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[1

] (./1.aux) ) 
Here is how much of TeX's memory you used:
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Output written on 1.pdf (1 page).

[muzimuzhi]

在哪些 pdf 阅读器里能复现？能提供 pdf 文件更好

[lygamac]

在哪些 pdf 阅读器里能复现？

部分网盘自带的 pdf 预览，okular, zathura (mupdf), xournalpp, inkscape 都能复现。

福昕阅读器没有问题，浏览器自身的预览（火狐，edge）没有问题，手机上网盘的预览也没有问题。疑似只有在基于 linux 发行版依赖的系统上才能复现。

1.pdf

[lygamac]

似乎是直接跳过CJK字体了。 复制不了显示不出来的中文部分，终端用的pdf预览也获取不到中文字体。

[CoelacanthusHex]

@lygamac 是否安装了poppler data，这是poppler based pdf viewer显示中文字体的必须组件

[stone-zeng]

根据 @clerkma 的说法，「凡是中文显示不出来的，poppler 没配置全的问题基本上占这一类问题的九成」，所以请试试装一下 poppler-data。

[lygamac]

这是poppler based pdf viewer显示中文字体的必须组件

装了 poppler-data 确实可以了。不过像 office 或者 xournalpp 里写中文导出 pdf 并不会导致在没有 poppler-data 的情况下显示不出中文字体。

是因为默认字体依赖于 poppler-data 吗？

[CoelacanthusHex]

@lygamac 那可能是是字体被曲线化了，也就是pdf里面已经存的不是字和字体，而是直接绘制那个字的形状的绘图指令（仅作猜测

[RuixiZhang42]

@CoelacanthusHex

那可能是是字体被曲线化了

可能不是，我之前也报给了 MikTeX，https://github.com/MiKTeX/miktex/issues/214 然而不了了之（哭）。看起来字体是成功 embed subset 了，但是自带的 PDF viewer 就是显示不出来……生成的 PDF 通过 pdftocairo 转图片也是一大串报错。

[lygamac]

@RuixiZhang42 应该是解码问题。poppler-data 本身就是解码数据，加上换别的字体就没问题了应该就是一般的 pdf 工具没有内置 Fandol 字体的解码功能