diff options
Diffstat (limited to 'doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex')
| -rw-r--r-- | doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex | 108 |
1 files changed, 104 insertions, 4 deletions
diff --git a/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex b/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex index d92bb7b55..686d1728f 100644 --- a/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex +++ b/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex @@ -457,7 +457,7 @@ expansion takes place inside the argument. \stopsubsection -\startsubsection[title={\prm {fontid} and \prm {setfontid}}] +\startsubsection[title={\prm {fontid}, \prm {setfontid} and \prm {mathstylefontid}}] \startsyntax \fontid\font @@ -465,7 +465,7 @@ expansion takes place inside the argument. This primitive expands into a number. The currently used font id is \number\fontid\font. Here are some more: \footnote {Contrary to \LUATEX\ this is -now a number so you need to use \type {\number} or \type {\the}. The same is true +now a number so you need to use \prm {number} or \prm {the}. The same is true for some other numbers and dimensions that for some reason ended up in the serializer that produced a sequence of tokens.} @@ -488,6 +488,15 @@ be bound to a real font, after all it's just a number. The primitive \prm {setfontid} can be used to enable a font with the given id, which of course needs to be a valid one. +In math mode the font id depends on the style because there we have a family of +three related fonts. In this document we get the following identifiers: + +\starttabulate[|l|c|] +\NC \type {$ \the \mathstylefontid \scriptscriptstyle \fam$} \NC $\the\mathstylefontid\scriptscriptstyle \fam$ \NC \NR +\NC \type {$ \the \mathstylefontid \scriptstyle \fam$} \NC $\the\mathstylefontid\scriptstyle \fam$ \NC \NR +\NC \type {$ \the \mathstylefontid \textstyle \fam$} \NC $\the\mathstylefontid\textstyle \fam$ \NC \NR +\stoptabulate + \stopsubsection \startsubsection[title={\prm {fontspecifiedname} and \prm {fontspecifiedsize}}] @@ -526,6 +535,8 @@ features but in \LUAMETATEX\ these primitives are gone. They are replace by a mo generic control primitive \prm {glyphoptions}. This numerical parameter is a bitset with the following fields: +% todo: use values + \starttabulate[|l|pl|] \DB value \BC effect \NC\NR \TB @@ -556,6 +567,62 @@ query a font dimensions with \prm {fontdimen} you get the raw value but with \pr \stopsubsection +\startsubsection[title={\prm {glyphxscaled}, \prm {glyphyscaled}}] + +These two relate to the previous one: + +\startbuffer +{\glyphxscale 1500 \the\glyphxscaled 100pt} and +{\glyphyscale 750 \the\glyphyscaled 100pt} +\stopbuffer + +\typebuffer + +We get: \inlinebuffer. + +\stopsubsection + +\startsubsection[title={Scaled fontdimensions}] + +When you use \prm {glyphscale}, \prm {glyphxscale} and|/|or \prm {glyphyscale} the font +dimensions + +\starttabulate[|l|c|c|c|] +\DB dimension \BC scale \NC xscale \NC yscale \NC\NR +\TB +\NC \prm {scaledemwidth} \NC \star \NC \star \NC \NC\NR +\NC \prm {scaledexheight} \NC \star \NC \NC \star \NC\NR +\NC \prm {scaledextraspace} \NC \star \NC \star \NC \NC\NR +\NC \prm {scaledinterwordshrink} \NC \star \NC \star \NC \NC\NR +\NC \prm {scaledinterwordspace} \NC \star \NC \star \NC \NC\NR +\NC \prm {scaledinterwordstretch} \NC \star \NC \star \NC \NC\NR +\NC \prm {scaledslantperpoint} \NC \star \NC \star \NC \NC\NR +\LL +\stoptabulate + +The next table shows the effective sized when we scale by 2000. The last two +columns scale twice: the shared scale and the x or y scale. + +\def\ShowThem#1% + {\normalexpanded{ + \BC \small \prm {\csstring\parametermark1} + \NC {\localcontrolled{\glyphscale2000 \glyphxscale1000 \glyphyscale 1000} \withoutpt\parametermark1} + \NC {\localcontrolled{\glyphscale1000 \glyphxscale2000 \glyphyscale 1000} \withoutpt\parametermark1} + \NC {\localcontrolled{\glyphscale1000 \glyphxscale1000 \glyphyscale 2000} \withoutpt\parametermark1} + \NC {\localcontrolled{\glyphscale2000 \glyphxscale2000 \glyphyscale 1000} \withoutpt\parametermark1} + \NC {\localcontrolled{\glyphscale2000 \glyphxscale1000 \glyphyscale 2000} \withoutpt\parametermark1} + \NC \NR}} + +\starttabulate[|l|c{.}|c{.}|c{.}|c{.}|c{.}|] + \ShowThem\scaledemwidth + \ShowThem\scaledexheight + \ShowThem\scaledextraspace + \ShowThem\scaledinterwordshrink + \ShowThem\scaledinterwordspace + \ShowThem\scaledinterwordstretch + \ShowThem\scaledslantperpoint +\stoptabulate + \startsubsection[title={\prm {fontspecdef}, \prm {fontspecid}, \prm {fontspecscale}, , \prm {fontspecxscale}, \prm {fontspecyscale}}] Because we have three scale related primitives \prm {glyphscale}, \prm @@ -702,6 +769,18 @@ instance content moved into the margin: \stopsubsection +\startsubsection[title={\prm{fontcharta}}] + +\topicindex {glyphs + properties} + +The \prm {fontcharwd}, \prm {fontcharht}, \prm {fontchardp} and \prm {fontcharit} +give access to character properties. To this repertoire \LUAMETATEX\ adds the top +accent accessor \prm {fontcharta} which came in handy for tracing. You pass a +font reference and character code. Normally only \OPENTYPE\ math fonts have this +property. + +\stopsubsection + \stopsection \startsection[title={The \LUA\ font library}][library=font] @@ -803,8 +882,8 @@ whatever purpose their use in \CONTEXT\ is fixed. More details about fonts in math mode can be found in the chapter about math so here we just mention a few primitives. The internal \prm {glyphtextscale}, \prm -{glyphscriptscriptscale} and \prm {glyphscriptscriptscale} registers can be set -to enforce additional scaling of math, like this: +{glyphscriptscale} and \prm {glyphscriptscriptscale} registers can be set to +enforce additional scaling of math, like this: \startbuffer $ a = b^2 = c^{d^2}$ @@ -845,6 +924,27 @@ values only makes sense in the perspective of the used macro package. \stopsubsection +\startsubsection[title={Tracing}] + +The \prm {tracingfonts} primitive that has been inherited from \PDFTEX\ has +been adapted to support variants in reporting the font. The reason for this +extension is that a csname not always makes sense. The zero case is the default. + +\starttabulate[|l|l|] +\DB value \BC reported \NC \NR +\TB +\NC \type{0} \NC \type{\foo xyz} \NC \NR +\NC \type{1} \NC \type{\foo (bar)} \NC \NR +\NC \type{2} \NC \type{<bar> xyz} \NC \NR +\NC \type{3} \NC \type{<bar @ ..pt> xyz} \NC \NR +\NC \type{4} \NC \type{<id>} \NC \NR +\NC \type{5} \NC \type{<id: bar>} \NC \NR +\NC \type{6} \NC \type{<id: bar @ ..pt> xyz} \NC \NR +\LL +\stoptabulate + +\stopsubsection + \stopsection \stopchapter |