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[lookup] More prep work for memoizing collect_features 

https://github.com/harfbuzz/harfbuzz/pull/1317
This commit is contained in:
Behdad Esfahbod 2018-10-25 20:48:20 -07:00
parent 96828b97a8
commit e8e67503ff
2 changed files with 39 additions and 44 deletions
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2
src/hb-ot-layout-common.hh
View File

@ -277,6 +277,8 @@ struct Script
{ return langSys.find_index (tag, index); }
inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
inline const LangSys& get_default_lang_sys (unsigned int i) const
{ return get_default_lang_sys (); }
inline const LangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
inline bool subset (hb_subset_context_t *c) const

65
src/hb-ot-layout.cc
View File

@ -681,40 +681,38 @@ _hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
}
static void
_hb_ot_layout_collect_features_features (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
langsys_collect_features (const OT::GSUBGPOS &g,
const OT::LangSys &l,
const hb_tag_t *features,
hb_set_t *feature_indexes /* OUT */)
{
if (!features)
{
unsigned int required_feature_index;
if (hb_ot_layout_language_get_required_feature (face,
table_tag,
script_index,
language_index,
&required_feature_index,
nullptr))
feature_indexes->add (required_feature_index);
/* All features. */
unsigned int index = l.get_required_feature_index ();
if (index != HB_OT_LAYOUT_NO_FEATURE_INDEX)
feature_indexes->add (index);
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
l.add_feature_indexes_to (feature_indexes);
}
else
{
/* Ugh. Any faster way? */
for (; *features; features++)
{
hb_tag_t feature_tag = *features;
unsigned int feature_index;
if (hb_ot_layout_language_find_feature (face,
table_tag,
script_index,
language_index,
*features,
&feature_index))
unsigned int num_features = l.get_feature_count ();
for (unsigned int i = 0; i < num_features; i++)
{
unsigned int feature_index = l.get_feature_index (i);
if (feature_tag == g.get_feature_tag (feature_index))
{
feature_indexes->add (feature_index);
break;
}
}
}
}
}
@ -727,25 +725,22 @@ _hb_ot_layout_collect_features_languages (hb_face_t *face,
const hb_tag_t *features,
hb_set_t *feature_indexes /* OUT */)
{
_hb_ot_layout_collect_features_features (face,
table_tag,
script_index,
HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
if (!languages)
{
/* All languages. */
langsys_collect_features (g,
g.get_script (script_index).get_default_lang_sys (),
features,
feature_indexes);
if (!languages)
{
/* All languages */
unsigned int count = hb_ot_layout_script_get_language_tags (face,
table_tag,
script_index,
0, nullptr, nullptr);
for (unsigned int language_index = 0; language_index < count; language_index++)
_hb_ot_layout_collect_features_features (face,
table_tag,
script_index,
language_index,
langsys_collect_features (g,
g.get_script (script_index).get_lang_sys (language_index),
features,
feature_indexes);
}
@ -760,10 +755,8 @@ _hb_ot_layout_collect_features_languages (hb_face_t *face,
1,
languages,
&language_index))
_hb_ot_layout_collect_features_features (face,
table_tag,
script_index,
language_index,
langsys_collect_features (g,
g.get_script (script_index).get_lang_sys (language_index),
features,
feature_indexes);
}
@ -785,7 +778,7 @@ hb_ot_layout_collect_features (hb_face_t *face,
{
if (!scripts)
{
/* All scripts */
/* All scripts. */
unsigned int count = hb_ot_layout_table_get_script_tags (face,
table_tag,
0, nullptr, nullptr);