Folks,
I have two questions.
(1) How can an application detect whether a call to building the font
cache (or updating the cache) takes a long time?
Or to ask differently: What is the correct code sequence in
calling fontconfig functions to get this information so that the
application can show a message, or, even better, a progress bar or
something similar? This would need registering a callback
function, I presume, but I don't find anything related to this in
the documentation.
For example, we are experiencing very long start-up delays if
lilypond is called the first time on Windows – usually, there is
no global fontconfig cache already existing, so it has to be built
from scratch.
I could imagine that fontconfig first scans all directories for
the number of font files, returning a total number of files to
process, then it calls the callback every time a file has been
processed.
(2) Below is the C++ code lilypond uses to set up fontconfig. Does
`FcConfigBuildFonts' update an existing cache, or does it
regenerate it from scratch? This is not documented...
Werner
======================================================================
FcInitLoadConfig ();
/* Create an empty configuration */
font_config_global = FcConfigCreate ();
/* fontconfig conf files */
vector<string> confs;
/* LilyPond local fontconfig conf file 00
This file is loaded *before* fontconfig's default conf. */
confs.push_back (lilypond_datadir + "/fonts/00-lilypond-fonts.conf");
/* fontconfig's default conf file */
void *default_conf = FcConfigFilename (NULL);
confs.push_back (static_cast<char*>(default_conf));
FcStrFree(static_cast<FcChar8*>(default_conf));
/* LilyPond local fontconfig conf file 99
This file is loaded *after* fontconfig's default conf. */
confs.push_back (lilypond_datadir + "/fonts/99-lilypond-fonts.conf");
/* Load fontconfig conf files */
for (vector<string>::const_iterator it = confs.begin ();
it != confs.end ();
it++)
{
if (!FcConfigParseAndLoad (font_config_global,
(FcChar8 *)it->c_str (),
FcFalse))
error (_f ("failed to add fontconfig configuration file `%s'",
it->c_str ()));
else
debug_output (_f ("Adding fontconfig configuration file: %s",
it->c_str ()));
}
/* Extra trailing slash suddenly breaks fontconfig (fc-cache 2.5.0)
on windows. */
string dir (lilypond_datadir + "/fonts/otf");
if (!FcConfigAppFontAddDir (font_config_global, (FcChar8 *)dir.c_str ()))
error (_f ("failed adding font directory: %s", dir.c_str ()));
else
debug_output (_f ("Adding font directory: %s", dir.c_str ()));
debug_output (_ ("Building font database..."));
FcConfigBuildFonts (font_config_global);
FcConfigSetCurrent (font_config_global);
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