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[layout] Add hb_collect_features_context_t 

Towards https://github.com/harfbuzz/harfbuzz/pull/1317
This commit is contained in:
Behdad Esfahbod 2018-10-25 21:26:08 -07:00
parent c237cdfcc7
commit 941600a9e0
1 changed files with 36 additions and 30 deletions
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66
src/hb-ot-layout.cc
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@ -655,20 +655,32 @@ hb_ot_layout_table_get_lookup_count (hb_face_t *face,
return get_gsubgpos_table (face, table_tag).get_lookup_count ();
}
struct hb_collect_features_context_t
{
hb_collect_features_context_t (hb_face_t *face,
hb_tag_t table_tag,
hb_set_t *feature_indexes_)
: g (get_gsubgpos_table (face, table_tag)),
feature_indexes (feature_indexes_) {}
const OT::GSUBGPOS &g;
hb_set_t *feature_indexes;
};
static void
langsys_collect_features (const OT::GSUBGPOS &g,
langsys_collect_features (hb_collect_features_context_t *c,
const OT::LangSys &l,
const hb_tag_t *features,
hb_set_t *feature_indexes /* OUT */)
const hb_tag_t *features)
{
if (!features)
{
/* All features. */
unsigned int index = l.get_required_feature_index ();
if (index != HB_OT_LAYOUT_NO_FEATURE_INDEX)
feature_indexes->add (index);
c->feature_indexes->add (index);
l.add_feature_indexes_to (feature_indexes);
l.add_feature_indexes_to (c->feature_indexes);
}
else
{
@ -682,9 +694,9 @@ langsys_collect_features (const OT::GSUBGPOS &g,
{
unsigned int feature_index = l.get_feature_index (i);
if (feature_tag == g.get_feature_tag (feature_index))
if (feature_tag == c->g.get_feature_tag (feature_index))
{
feature_indexes->add (feature_index);
c->feature_indexes->add (feature_index);
break;
}
}
@ -693,26 +705,23 @@ langsys_collect_features (const OT::GSUBGPOS &g,
}
static void
script_collect_features (const OT::GSUBGPOS &g,
script_collect_features (hb_collect_features_context_t *c,
const OT::Script &s,
const hb_tag_t *languages,
const hb_tag_t *features,
hb_set_t *feature_indexes /* OUT */)
const hb_tag_t *features)
{
if (!languages)
{
/* All languages. */
langsys_collect_features (g,
langsys_collect_features (c,
s.get_default_lang_sys (),
features,
feature_indexes);
features);
unsigned int count = s.get_lang_sys_count ();
for (unsigned int language_index = 0; language_index < count; language_index++)
langsys_collect_features (g,
langsys_collect_features (c,
s.get_lang_sys (language_index),
features,
feature_indexes);
features);
}
else
{
@ -720,10 +729,9 @@ script_collect_features (const OT::GSUBGPOS &g,
{
unsigned int language_index;
if (s.find_lang_sys_index (*languages, &language_index))
langsys_collect_features (g,
langsys_collect_features (c,
s.get_lang_sys (language_index),
features,
feature_indexes);
features);
}
}
}
@ -741,29 +749,27 @@ hb_ot_layout_collect_features (hb_face_t *face,
const hb_tag_t *features,
hb_set_t *feature_indexes /* OUT */)
{
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
hb_collect_features_context_t c (face, table_tag, feature_indexes);
if (!scripts)
{
/* All scripts. */
unsigned int count = g.get_script_count ();
unsigned int count = c.g.get_script_count ();
for (unsigned int script_index = 0; script_index < count; script_index++)
script_collect_features (g,
g.get_script (script_index),
script_collect_features (&c,
c.g.get_script (script_index),
languages,
features,
feature_indexes);
features);
}
else
{
for (; *scripts; scripts++)
{
unsigned int script_index;
if (g.find_script_index (*scripts, &script_index))
script_collect_features (g,
g.get_script (script_index),
if (c.g.find_script_index (*scripts, &script_index))
script_collect_features (&c,
c.g.get_script (script_index),
languages,
features,
feature_indexes);
features);
}
}
}