递归字体、多个轴、fontspec、texlive 2022

Question

我已经安装了 texlive 2022 预测试并对其进行了尝试。

我找到了一种名为 Recursive 的字体，请参见此处：https://fonts.google.com/specimen/Recursive#about以及这里的网站：https://www.recursive.design/. 根据此处的手册https://www.recursive.design/assets/arrowtype-recursive-sansmono-specimen.pdf有多个轴。

我发现这个解释如何使用字体特征轴，请参阅https://tex.stackexchange.com/a/591485/4736。

但我无法让斜体轴工作。

上面提到的字体带有一个可变字体文件，名为 Recursive-VariableFont_CASL,CRSV,MONO,slnt,wght.ttf，我将其重命名为 Recursive-VariableFont.ttf。

我找不到有关 的任何文档+axis=。这方面的文档在哪里？我使用的是 fontspec v2.8a。

到目前为止我已经尝试过：

\documentclass[a4paper,12pt]{article}
\usepackage{fontspec}
\defaultfontfeatures{%
   RawFeature={+axis={CRSV}}%, slnt, CASL, wght}},
   % RawFeature={+axis={wght=100}},
   % RawFeature={+axis={mono=0}},
   % RawFeature={+axis={slnt=0}},
   % RawFeature={+axis={CASL=0}},
}
\setmainfont[
   ItalicFont=Recursive-VariableFont.ttf,
   BoldFont=Recursive-VariableFont.ttf,
   BoldItalicFont=Recursive-VariableFont.ttf,
    BoldFeatures={RawFeature={+axis={wght=500}}},
    BoldItalicFeatures={RawFeature={+axis={wght=900}}},
    ItalicFeatures = {RawFeature={+axis={CRSV=1}}}
    ]{Recursive-VariableFont.ttf}

    \setmonofont{Recursive-VariableFont.ttf}[%
    RawFeature={+axis={mono=1}}]


    
\begin{document}
\par the quick brown fox jumps over the lazy dog.
\par\textit{the quick brown fox jumps over the lazy dog.}
\par\textbf{the quick brown fox jumps over the lazy dog.}
\par\textbf{\textit{the quick brown fox jumps over the lazy dog.}}

\texttt{Es irrt der Mensch..}

\end{document}
% Local Variables:
% TeX-engine: luatex
% End:

输出：

Running `LaTeX' on `variable-recursive' with ``lualatex --jobname=variable-recursive  -file-line-error   --synctex=1 -interaction=nonstopmode variable-recursive.tex''
This is LuaHBTeX, Version 1.15.0 (TeX Live 2022) 
 restricted system commands enabled.
(./variable-recursive.tex
LaTeX2e <2021-11-15> patch level 1
 L3 programming layer <2022-02-24>
(/local/texlive/2022/texmf-dist/tex/latex/base/article.cls
Document Class: article 2021/10/04 v1.4n Standard LaTeX document class
(/local/texlive/2022/texmf-dist/tex/latex/base/size12.clo))
(/local/texlive/2022/texmf-dist/tex/latex/fontspec/fontspec.sty
(/local/texlive/2022/texmf-dist/tex/latex/l3packages/xparse/xparse.sty
(/local/texlive/2022/texmf-dist/tex/latex/l3kernel/expl3.sty
(/local/texlive/2022/texmf-dist/tex/latex/l3backend/l3backend-luatex.def)))
(/local/texlive/2022/texmf-dist/tex/latex/fontspec/fontspec-luatex.sty
(/local/texlive/2022/texmf-dist/tex/latex/base/fontenc.sty)
(/local/texlive/2022/texmf-dist/tex/latex/fontspec/fontspec.cfg)))
(./variable-recursive.aux)
(/local/texlive/2022/texmf-dist/tex/latex/base/ts1cmr.fd) [1{/local/texlive/2022/texmf-var/fonts/map/pdftex/updmap/pdftex.map}] (./variable-recursive.aux))
 406 words of node memory still in use:
   3 hlist, 1 vlist, 1 rule, 2 glue, 3 kern, 1 glyph, 4 attribute, 48 glue_spec, 4 attribute_list, 1 write nodes
   avail lists: 2:49,3:12,4:1,5:96,6:10,7:460,9:34
</home/AW/.fonts/r/Recursive-VariableFont.ttf></home/AW/.fonts/r/Recursive-VariableFont.ttf></home/AW/.fonts/r/Recursive-VariableFont.ttf></home/AW/.fonts/r/R
ecursive-VariableFont.ttf></home/AW/.fonts/r/Recursive-VariableFont.ttf>
Output written on variable-recursive.pdf (1 page, 41296 bytes).
SyncTeX written on variable-recursive.synctex.gz.
Transcript written on variable-recursive.log.

TeX Output finished at Tue Mar  1 18:03:24

但 pdf 中没有斜体字母：

有任何想法吗？

Answer 1

该axis功能已记录在luaotfload手册中。该功能在 TeX Live 2021 中已经存在，但当时它只适用于整形node器，而不适用于基于 HarfBuzz 的harf整形器。在 TeX Live 2022 中，我们对其进行了扩展，使其也适用于 HarfBuzz。正如您所注意到的，该node实现不喜欢大写的轴名，但您可以在 TL 2022 中通过切换到 HarfBuzz 来解决这个问题：

\documentclass[a4paper,12pt]{article}
\usepackage{fontspec}

\setmainfont[
   Renderer=HarfBuzz,
   ItalicFont=Recursive-VariableFont.ttf,
   BoldFont=Recursive-VariableFont.ttf,
   BoldItalicFont=Recursive-VariableFont.ttf,
    BoldFeatures={RawFeature={+axis={wght=500}}},
    BoldItalicFeatures={RawFeature={+axis={wght=900}}},
    ItalicFeatures = {RawFeature={+axis={CRSV=1}}}
    ]{Recursive-VariableFont.ttf}

    \setmonofont{Recursive-VariableFont.ttf}[%
    Renderer=HarfBuzz,
    RawFeature={+axis={MONO=1}}]


    
\begin{document}
\par the quick brown fox jumps over the lazy dog.
\par\textit{the quick brown fox jumps over the lazy dog.}
\par\textbf{the quick brown fox jumps over the lazy dog.}
\par\textbf{\textit{the quick brown fox jumps over the lazy dog.}}

\texttt{Es irrt der Mensch..}

\end{document}