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vfs_ttf: respond to dynamic config changes

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Issue #2740
This commit is contained in:
Norman Feske 2018-04-16 12:15:14 +02:00
parent 6a12a6b4ba
commit e896d13eec
1 changed files with 49 additions and 19 deletions
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68
repos/gems/src/lib/vfs/ttf/vfs.cc
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@ -71,28 +71,47 @@ struct Vfs_ttf::Font_from_file
struct Vfs_ttf::Local_factory : File_system_factory
{
Font_from_file _font;
Cached_font::Limit _cache_limit;
Cached_font _cached_font;
Glyphs_file_system _glyphs_fs;
Readonly_value_file_system<unsigned> _baseline_fs;
Readonly_value_file_system<unsigned> _max_width_fs;
Readonly_value_file_system<unsigned> _max_height_fs;
Vfs::Env &_env;
Local_factory(Vfs::Env &vfs_env, Xml_node node)
struct Font
{
Font_from_file font;
Cached_font::Limit cache_limit;
Cached_font cached_font;
Font(Vfs::Env &env, Xml_node config)
:
font(env,
config.attribute_value("path", Directory::Path()),
config.attribute_value("size_px", 16.0)),
cache_limit({config.attribute_value("cache", Number_of_bytes())}),
cached_font(env.alloc(), font.font(), cache_limit)
{ }
};
Reconstructible<Font> _font;
Glyphs_file_system _glyphs_fs { _font->cached_font };
Readonly_value_file_system<unsigned> _baseline_fs { "baseline", 0 };
Readonly_value_file_system<unsigned> _max_width_fs { "max_width", 0 };
Readonly_value_file_system<unsigned> _max_height_fs { "max_height", 0 };
void _update_attributes()
{
_baseline_fs .value(_font->font.font().baseline());
_max_width_fs .value(_font->font.font().bounding_box().w());
_max_height_fs.value(_font->font.font().bounding_box().h());
}
Local_factory(Vfs::Env &env, Xml_node config)
:
_font(vfs_env,
node.attribute_value("path", Directory::Path()),
node.attribute_value("size_px", 16.0)),
_cache_limit({node.attribute_value("cache", Number_of_bytes())}),
_cached_font(vfs_env.alloc(), _font.font(), _cache_limit),
_glyphs_fs (_cached_font),
_baseline_fs ("baseline", _font.font().baseline()),
_max_width_fs ("max_width", _font.font().bounding_box().w()),
_max_height_fs("max_height", _font.font().bounding_box().h())
{ }
_env(env), _font(env, config)
{
_update_attributes();
}
Vfs::File_system *create(Vfs::Env&, Genode::Xml_node node) override
Vfs::File_system *create(Vfs::Env&, Xml_node node) override
{
if (node.has_type(Glyphs_file_system::type_name()))
return &_glyphs_fs;
@ -105,6 +124,12 @@ struct Vfs_ttf::Local_factory : File_system_factory
return nullptr;
}
void apply_config(Xml_node const &config)
{
_font.construct(_env, config);
_update_attributes();
}
};
@ -141,6 +166,11 @@ class Vfs_ttf::File_system : private Local_factory,
{ }
char const *type() override { return "ttf"; }
void apply_config(Xml_node const &node) override
{
Local_factory::apply_config(node);
}
};