On Wed, Sep 25, 2013 at 9:54 PM, Lars Huttar <lars_hut...@sil.org> wrote:
> And is the answer that the bodyfont is a conglomerate
> of more properties than just the font, including interlinespace?
>
You can read font-ini.mkvi :
%D \macros
%D {setupbodyfont,switchtobodyfont}
%D
%D The next two macros are user ones. With \type{\setupbodyfont}
%D one can set the document bodyfont size, font family, style
%D and/or options defined in files, for example:
%D
%D \starttyping
%D \setupbodyfont[modern,12pt,roman]
%D \stoptyping
%D
%D This command affects the document as a whole: text, headers
%D and footers. The second macro however affects only the text:
%D
%D \starttyping
%D \switchtobodyfont[10pt]
%D \stoptyping
%D
%D So we've got:
%D
%D \showsetup{setupbodyfont}
%D \showsetup{switchtobodyfont}
%D
%D Both macros look alike. The second one also has to take
%D all kind of keywords into account.
If you follow switchtobodyfont you can see
unexpanded\def\font_basics_switchtobodyfont#specification%
{\edef\m_font_step{\bodyfontvariable{#specification}}%
\ifx\m_font_step\empty
\font_helpers_set_font\zerocount{#specification}%
\else
\font_helpers_switch_bodyfont_step % so we have a fast [small] switch
\fi
\the\everybodyfont
\the\everyswitchtobodyfont}
\unexpanded\def\switchtobodyfont[#specification]% could become an ifx
{\doifsomething{#specification}{\font_basics_switchtobodyfont{#specification}}}
The token register \everybodyfont and
\everyswitchtobodyfont take care for spaces:
(still in font-ini.mkvi)
%D {everybodyfont,Everybodyfont,everyglobalbodyfont}
%D
%D Every change in bodyfont size has conseqences for the baseline
%D distance and skips between paragraphs. These are initialized
%D in other modules. Here we only provide the hooks that
%D garantees their handling.
%D At the system level one can initialize thing like:
%D
%D \starttyping
%D \appendtoks \setupspacing \to \everybodyfont
%D \stoptyping
In core-def.mkiv
\appendtoks
\synchronizelocallinespecs
\to \everyswitchtobodyfont
while spac-ver.mkiv
\unexpanded\def\synchronizelocallinespecs
{\bodyfontlineheight \normallineheight
\bodyfontstrutheight\strutheight
\bodyfontstrutdepth \strutdepth}
--
luigi
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