fontspec 光学尺寸

2024-5-25 • tag-icon

LuaLaTeX我正在尝试通过包设置可变字体fontspec。我试图让字体大小和光学尺寸（opsz）具有几乎相同的值。（我知道opsz可变轴必须在和之间6，144步长为0.1，因此数字不会完美同步。请参阅：https://fonts.google.com/knowledge/glossary/optical_size_axis）

文档fontspec显示您必须手动设置每种字体大小的光学尺寸，并且每次添加新字体时都必须添加额外的字体大小-光学尺寸对。显然，这会很累，而且需要很长时间。我希望光学尺寸（几乎总是）自动等于字体大小。（{Size=X,RawFeature={axis={opsz=X}}}对于 X 的每个可能值。）

在以下 MWE 中，我手动设置了由文档类定义的每种字体大小的光学尺寸。 (并且，由于某种原因，带有、和的article段落的行距混乱了。)\LARGE\huge\Huge

编辑：我添加了粗体、斜体和粗斜体的代码，以帮助读者了解手动设置每种字体大小的视觉尺寸是多么繁琐。我甚至还没有设置不同粗细的命令：ExtraLight、Light、Medium、SemiBold、ExtraBold 和 Black。

\documentclass{article}
\usepackage[lmargin=1in,rmargin=1in]{geometry}
\raggedright\raggedbottom
\parindent=0pt
\parskip=7pt
\usepackage{blindtext}
\usepackage{fontspec}
\setmonofont{Source Code Pro}%Available for free on Google Fonts.
\setmainfont{SourceSerif4-VariableFont_opsz,wght.ttf}[%Available for free on Google Fonts.
    ,Kerning=On,Numbers={Lining,Tabular}
    %Regular
    ,SizeFeatures={
        {Size=7,RawFeature={axis={opsz=7}}}%\scriptsize
        ,{Size=8,RawFeature={axis={opsz=8}}}%\footnotesize
        ,{Size=9,RawFeature={axis={opsz=9}}}%\small
        ,{Size=10,RawFeature={axis={opsz=10}}}%\normalsize
        ,{Size=12,RawFeature={axis={opsz=12}}}%\large
        ,{Size=14.4,RawFeature={axis={opsz=14.4}}}%\Large
        ,{Size=17.28,RawFeature={axis={opsz=17.3}}}%\LARGE
        ,{Size=20.74,RawFeature={axis={opsz=20.7}}}%\huge
        ,{Size=24.88,RawFeature={axis={opsz=24.9}}}%\Huge
    }
    %Bold
    ,BoldFont={SourceSerif4-VariableFont_opsz,wght.ttf}
    ,BoldFeatures={
        SizeFeatures={
            {Size=7,RawFeature={axis={wght=700,opsz=7}}}%\scriptsize
            ,{Size=8,RawFeature={axis={wght=700,opsz=8}}}%\footnotesize
            ,{Size=9,RawFeature={axis={wght=700,opsz=9}}}%\small
            ,{Size=10,RawFeature={axis={wght=700,opsz=10}}}%\normalsize
            ,{Size=12,RawFeature={axis={wght=700,opsz=12}}}%\large
            ,{Size=14.4,RawFeature={axis={wght=700,opsz=14.4}}}%\Large
            ,{Size=17.28,RawFeature={axis={wght=700,opsz=17.3}}}%\LARGE
            ,{Size=20.74,RawFeature={axis={wght=700,opsz=20.7}}}%\huge
            ,{Size=24.88,RawFeature={axis={wght=700,opsz=24.9}}}%\Huge
        }
    }
    %Italics
    ,ItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    ,ItalicFeatures={
        SizeFeatures={
            {Size=7,RawFeature={axis={opsz=7}}}%\scriptsize
            ,{Size=8,RawFeature={axis={opsz=8}}}%\footnotesize
            ,{Size=9,RawFeature={axis={opsz=9}}}%\small
            ,{Size=10,RawFeature={axis={opsz=10}}}%\normalsize
            ,{Size=12,RawFeature={axis={opsz=12}}}%\large
            ,{Size=14.4,RawFeature={axis={opsz=14.4}}}%\Large
            ,{Size=17.28,RawFeature={axis={opsz=17.3}}}%\LARGE
            ,{Size=20.74,RawFeature={axis={opsz=20.7}}}%\huge
            ,{Size=24.88,RawFeature={axis={opsz=24.9}}}%\Huge
        }
    }
    %Bold Italics
    ,BoldItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    ,BoldItalicFeatures={
        SizeFeatures={
            {Size=7,RawFeature={axis={wght=700,opsz=7}}}%\scriptsize
            ,{Size=8,RawFeature={axis={wght=700,opsz=8}}}%\footnotesize
            ,{Size=9,RawFeature={axis={wght=700,opsz=9}}}%\small
            ,{Size=10,RawFeature={axis={wght=700,opsz=10}}}%\normalsize
            ,{Size=12,RawFeature={axis={wght=700,opsz=12}}}%\large
            ,{Size=14.4,RawFeature={axis={wght=700,opsz=14.4}}}%\Large
            ,{Size=17.28,RawFeature={axis={wght=700,opsz=17.3}}}%\LARGE
            ,{Size=20.74,RawFeature={axis={wght=700,opsz=20.7}}}%\huge
            ,{Size=24.88,RawFeature={axis={wght=700,opsz=24.9}}}%\Huge
        }
    }
]
\begin{document}
\texttt{REGULAR}
\par
{\scriptsize\texttt{scriptsize}\hspace{0.5em}\blindtext}
\par
{\footnotesize\texttt{footnotesize}\hspace{0.5em}\blindtext}
\par
{\small\texttt{small}\hspace{0.5em}\blindtext}
\par
{\normalsize\texttt{normalsize}\hspace{0.5em}\blindtext}
\par
{\large\texttt{large}\hspace{0.5em}\blindtext}
\par
{\Large\texttt{Large}\hspace{0.5em}\blindtext}
\par
{\LARGE\texttt{LARGE}\hspace{0.5em}\blindtext}
\par
{\huge\texttt{huge}\hspace{0.5em}\blindtext}
\par
{\Huge\texttt{Huge}\hspace{0.5em}\blindtext}
\par
\texttt{BOLD}{\bfseries
\par
{\scriptsize\texttt{scriptsize}\hspace{0.5em}\blindtext}
\par
{\footnotesize\texttt{footnotesize}\hspace{0.5em}\blindtext}
\par
{\small\texttt{small}\hspace{0.5em}\blindtext}
\par
{\normalsize\texttt{normalsize}\hspace{0.5em}\blindtext}
\par
{\large\texttt{large}\hspace{0.5em}\blindtext}
\par
{\Large\texttt{Large}\hspace{0.5em}\blindtext}
\par
{\LARGE\texttt{LARGE}\hspace{0.5em}\blindtext}
\par
{\huge\texttt{huge}\hspace{0.5em}\blindtext}
\par
{\Huge\texttt{Huge}\hspace{0.5em}\blindtext}
}
\par
\texttt{ITALICS}{\itshape
\par
{\scriptsize\texttt{scriptsize}\hspace{0.5em}\blindtext}
\par
{\footnotesize\texttt{footnotesize}\hspace{0.5em}\blindtext}
\par
{\small\texttt{small}\hspace{0.5em}\blindtext}
\par
{\normalsize\texttt{normalsize}\hspace{0.5em}\blindtext}
\par
{\large\texttt{large}\hspace{0.5em}\blindtext}
\par
{\Large\texttt{Large}\hspace{0.5em}\blindtext}
\par
{\LARGE\texttt{LARGE}\hspace{0.5em}\blindtext}
\par
{\huge\texttt{huge}\hspace{0.5em}\blindtext}
\par
{\Huge\texttt{Huge}\hspace{0.5em}\blindtext}
}
\par
\texttt{BOLD ITALICS}{\itshape\bfseries
\par
{\scriptsize\texttt{scriptsize}\hspace{0.5em}\blindtext}
\par
{\footnotesize\texttt{footnotesize}\hspace{0.5em}\blindtext}
\par
{\small\texttt{small}\hspace{0.5em}\blindtext}
\par
{\normalsize\texttt{normalsize}\hspace{0.5em}\blindtext}
\par
{\large\texttt{large}\hspace{0.5em}\blindtext}
\par
{\Large\texttt{Large}\hspace{0.5em}\blindtext}
\par
{\LARGE\texttt{LARGE}\hspace{0.5em}\blindtext}
\par
{\huge\texttt{huge}\hspace{0.5em}\blindtext}
\par
{\Huge\texttt{Huge}\hspace{0.5em}\blindtext}
}
\end{document}

更新 2023-01-02：我一直在测试Marcel Kruger 建议的HarfBuzz自动调整opsz轴大小的方法。我发现它除了自动调整轴大小之外还有其他功能opsz。两个主要问题：

(1) 如果我将字体更改为Source Sans 3另一种可变字体（代码与 Marcel Kruger 提供的代码几乎相同），并测试使用/不使用HarfBuzz，我发现使用和不使用的文档版本HarfBuzz看起来彼此明显不同。文档版本应该看起来相同，因为Source Sans 3缺少opsz轴。因此，Renderer=HarfBuzz除了修改opsz轴之外，还具有其他功能。添加的功能在印刷上可能是也可能不是最佳的。您可以在下面的第二个 MWE 中亲自看到这一点。

(2) 使用Renderer=HarfBuzzwithSource Serif 4和\textls包中的 letterspacing 命令microtype有时会产生错误的字母间距。我没有发现错误模式，但我在第二个 MWE 中复制了一些错误。我发现可以通过使用代替Source Sans 3或本地设置来修复此错误Kerning=Off。在修复此 letterspacing 错误时，我希望该\textls命令自动在本地禁用字距调整。

\documentclass{article}
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}%clears default header footers
\fancyhead[C]{%
    %\addfontfeatures{Kerning=Off}%In my testing, this fixes the bugged letterspacing.
    \textls[100]{LETTERSPACING IS BUGGED}%
}
\fancyfoot[C]{%
    %\addfontfeatures{Kerning=Off}%In my testing, this fixes the bugged letterspacing.
    ~\textls[100]{BUGGED}%
    ~(%
    \textls[100]{LETTER}%
    ~\textls[100]{SPACING}%
    )%
}
\usepackage{microtype}
\usepackage{blindtext}
\usepackage{fontspec}
\setmonofont{Source Code Pro}
\setromanfont{SourceSerif4-VariableFont_opsz,wght.ttf}[%Available for free on Google Fonts.
    ,Kerning=On,Numbers={Lining,Tabular},Renderer=HarfBuzz
    %Bold
    ,BoldFont={SourceSerif4-VariableFont_opsz,wght.ttf}
    ,BoldFeatures={RawFeature={axis={wght=700}}}
    %Italics
    ,ItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    %Bold Italics
    ,BoldItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    ,BoldItalicFeatures={RawFeature={axis={wght=700}}}
]
\setsansfont{SourceSans3-VariableFont_wght.ttf}[%Available for free on Google Fonts.
    Kerning=On
    %,Renderer=HarfBuzz%In my testing Renderer=HarfBuzz will change the text display even though Source Sans 3 lacks an opsz axis.
    %Regular
    ,RawFeature={axis={wght=400}}
    %Bold
    ,BoldFont={SourceSans3-VariableFont_wght.ttf}
    ,BoldFeatures={RawFeature={axis={wght=700}}}
    %Italics
    ,ItalicFont={SourceSans3-Italic-VariableFont_wght.ttf}
    ,ItalicFeatures={RawFeature={axis={wght=400}}}
    %Bold Italics
    ,BoldItalicFont={SourceSans3-Italic-VariableFont_wght.ttf}
    ,BoldItalicFeatures={RawFeature={axis={wght=700}}}
]
\renewcommand{\familydefault}{%use this to switch between serif and sans fonts
    \rmdefault%
    %\sfdefault%
}
\begin{document}
{%
    %\addfontfeatures{Kerning=Off}%In my testing, this fixes the bugged letterspacing. Note that I have disabled kerning locally to not mess up the rest of the document.
    \textls[100]{LETTER SPACING IS BUGGED}%
}%
\par
\blinddocument
\small\blinddocument
\tiny\blinddocument
\end{document}

编辑：我使用了启用了该功能的showhyphenation软件包Renderer=HarfBuzz，发现后者严重扰乱了连字。我使用其他文档对此进行了测试。

答案1

您可以请求基于 HarfBuzz 的渲染器，而无需指定任何opsz功能。如果没有给出明确的值，HarfBuzz 模式会自动opsz根据字体大小确定：

\documentclass{article}
\usepackage{blindtext}
\usepackage{fontspec}
\setmonofont{Source Code Pro}
\setmainfont{SourceSerif4-VariableFont_opsz,wght.ttf}[%Available for free on Google Fonts.
    ,Kerning=On,Numbers={Lining,Tabular},Renderer=HarfBuzz
    %Bold
    ,BoldFont={SourceSerif4-VariableFont_opsz,wght.ttf}
    ,BoldFeatures={RawFeature={axis={wght=700}}}
    %Italics
    ,ItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    %Bold Italics
    ,BoldItalicFont={SourceSerif4-Italic-VariableFont_opsz,wght.ttf}
    ,BoldItalicFeatures={RawFeature={axis={wght=700}}}
]
\begin{document}
\blinddocument
\small\blinddocument
\tiny\blinddocument
\end{document}

答案1

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