On 5/5/2014 8:37 PM, Rik Kabel wrote:
On 2014-05-05 11:29, Michael Ash wrote:
... see message 56606
<http://www.mail-archive.com/ntg-context%40ntg.nl/msg56606.html>
in the
list archive. This is not the post-simplefonts solution, but the
pre-simplefonts solution. It does allow much better control over
all of
the fonts that make up the typeface (using ConTeXt terminology).
If you set only some Hebrew/Aramaic/Arabic, and especially if you
do not
need font variants (bold, italic, ...) you might prefer to define a
single font.
Thank you very much again. This was helpful, and here is my minimal
working example:
\definefontfeature[hebrew][default][script=hebr,ccmp=yes]
\definefont [myhebrew] [SILEOTSR.ttf*hebrew]
\setupdirections[bidi=on,method=two]
\starttext
Here is the first line of the Bible.
{\myhebrew בְּרֵאשִׁ֖ית בָּרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃ }
\stoptext
I still have some questions. It took me a long time to understand that
\definefont [myhebrew] [SILEOTSR.ttf*hebrew]
would use the fontfeature "hebrew" that I had defined together with
the font file SILEOTSR.ttf and assign this pairing to the nickname
"myhebrew". Rik's example also has "sa 1" which I do not understand.
\definefontfeature [aramaic] [default][ccmp=yes,script=hebr]
\definefont [aramaic] [KeterYG-Medium.ttf*aramaic sa 1]
Is the syntax for definefont using "*" documented somewhere? Is it
similar to definefontsynonym at
http://wiki.contextgarden.net/Fonts_in_LuaTeX (and below)?
I also do not understand the full syntax from the referenced message.
Here is my best effort to annotate it, but I would appreciate
corrections or additions
%% The following defines the fontfeature "hebrew"
%% which can then be applied to a font.
%% definefontfeature is documented at
%%http://wiki.contextgarden.net/Command/definefontfeature
%% and the available features are specific to the font
%% e.g.http://www.microsoft.com/typography/otspec/featurelist.htm
\definefontfeature[hebrew][default][script=hebr,ccmp=yes,mark=yes]
%% I am confused below. When was font:fallback:serif defined?
%% Why file: but features= ?
%% How will the fontsynonym "Serif" function?
\starttypescript [serif] [ezrasil]
\setups[font:fallback:serif]
\definefontsynonym [Serif] [file:sileot] [features=hebrew]
\stoptypescript
%% Still confused
\starttypescript [ezrasil]
\definetypeface [ezrasil] [rm] [serif] [ezrasil] [default]
\quittypescriptscanning
\stoptypescript
%% Sets the main body to the font
%% that has been named and given features
\setupbodyfont[ezrasil]
%% Would an alternative at this point be to use
%% \definefont [myezrasil] [ezrasil]
%% to define a single font and then use {\myezrasilבְּרֵאשִׁ֖ית}for short
passages
\setupalign[r2l]
\starttext
בְּרֵאשִׁ֖ית בָּרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃
\stoptext
Michael,
Wolfgang already answered most of your questions, at least by the
expedient means of teaching a man to fish. However, not all of the
questions are answered in the font manuals, and in particular your
question about the font fallbacks. (The word setups does not appear in
mfonts, and fallback appears once. In the MKIV font manual setups
appears once and fallback thrice. None provide your answer.)
Font definition in ConTeXt allows extreme degrees of indirection. There
is a lot of flexibility that follows from this. By defining synonyms
such as serif and serifbold and using these in the document, the
document can be written independently of the actual fonts used. The
names are to some degree arbitrary, but used conventionally. There is
nothing stopping you from placing a sans font at the end of a chain of
serif references.
Setups are at their simplest a way to bundle other commands for reuse.
They also provide a namespace mechanism and a mechanism for group
setting and resetting of values.
The ConTeXt source file type-fbk.mkiv (and undoubtedly something similar
for MKII) defines a set of font name synonyms in a font:fallback:
namespace that is useful for gracefully substituting one font for
another when required, as when the document calls for a bold italic but
the font in use does not have that style. You can leave this out, or
define your own fallback hierarchy if you wish.
So, the first part of the typescript above defines ezrasil as a synonym
for the serif face and associates it with the file sileot and certain
otf features labeled hebrew. The file naming and search mechanism are
well described in the manuals. The setups brings in the standard set of
substitutions that will be applied when the document calls for serif
styles that the specific font does not offer.
The second part of the typescript defines another synonym (confusingly
also ezrasil) for the typeface and includes in it only a roman face
definition. In a latin script there would likely be another
definetypeface for the sans face, another for the mono face, and a
fourth for the math face. Setupbodyfont uses the name of a typeface so
defined. (You can see that this is a separate synonym by substituting
\starttypescript [bart]
\definetypeface [bart] [rm] [serif] [ezrasil] [default]
\quittypescriptscanning
\stoptypescript
\setupbodyfont[bart]
for the similar lines further above.) With a latin face there would have
been additional occurrences of the first part of the typescript as well
for each of the different face variants.
As to why I have "sa 1" (scale at 1) in the KeterYG definition: This is
not needed, but it serves as a reminder that I have evaluated the font
and that this scale is okay for me. I find that when I mix fonts, it
helps to adjust the sizes. Ezra SIL needs to be scaled to 0.85 or so,
but of course that depends on the other fonts in use and one's own
taste. (In LaTeX, the fontspec package provides a mechanism to
automatically scale fonts to match the x-height or full height of one
font to another. The process is manual here.)
context always had (has) the 'rscale' option
btw, scaling to the x height or ascender is quite unpredictable:
\starttext
\definedfont[Serif*default at 10pt] xxXX\par
\definedfont[Serif*default sc 10pt] xxXX\par
\definedfont[Serif*default ht 10pt] xxXX\par
\switchtobodyfont[dejavu]
\definedfont[Serif*default at 10pt] xxXX\par
\definedfont[Serif*default sc 10pt] xxXX\par
\definedfont[Serif*default ht 10pt] xxXX\par
\stoptext
best is to look at the result:
\showfontstrip
\showminimalbaseline
I'll step aside now and let those who know better correct me.
--
Rik
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