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[aat/morx] Implement language-specific forms 

Test on Mac with, eg.

$ hb-view /Library/Fonts/BigCaslon.ttf -u 107
vs
$ hb-view /Library/Fonts/BigCaslon.ttf -u 107 --language pl

Fixes https://github.com/harfbuzz/harfbuzz/issues/1373
This commit is contained in:
Behdad Esfahbod 2022-07-17 21:32:27 -06:00
parent d8574b44cc
commit 2124ad8906
2 changed files with 11 additions and 2 deletions
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7
src/hb-aat-layout-morx-table.hh
View File

@ -980,6 +980,13 @@ struct Chain
setting = HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_SMALL_CAPS; setting = HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_SMALL_CAPS;
goto retry; goto retry;
} }
else if (type == HB_AAT_LAYOUT_FEATURE_TYPE_LANGUAGE_TAG_TYPE && setting &&
/* TODO: Rudimentary language matching. */
map->face->table.ltag->get_language (setting - 1) == map->props.language)
{
flags &= feature.disableFlags;
flags |= feature.enableFlags;
}
} }
} }
return flags; return flags;

6
src/hb-aat-map.hh
View File

@ -52,8 +52,9 @@ struct hb_aat_map_builder_t
public: public:
HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_, HB_INTERNAL hb_aat_map_builder_t (hb_face_t *face_,
const hb_segment_properties_t *props_ HB_UNUSED) : const hb_segment_properties_t *props_) :
face (face_) {} face (face_),
props (*props_) {}
HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value=1); HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value=1);
@ -87,6 +88,7 @@ struct hb_aat_map_builder_t
public: public:
hb_face_t *face; hb_face_t *face;
hb_segment_properties_t props;
public: public:
hb_sorted_vector_t<feature_info_t> features; hb_sorted_vector_t<feature_info_t> features;