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[OT] Allow adding features with fallback implementation

This commit is contained in:
Behdad Esfahbod 2012-09-04 23:06:38 -04:00
parent 1d3947a6bd
commit 87b75d0a4a
2 changed files with 8 additions and 5 deletions
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7
src/hb-ot-map-private.hh
View File

@ -147,10 +147,10 @@ struct hb_ot_map_builder_t
hb_ot_map_builder_t (void) { memset (this, 0, sizeof (*this)); }
HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, bool global);
HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, bool global, bool has_fallback = false);
inline void add_bool_feature (hb_tag_t tag, bool global = true)
{ add_feature (tag, 1, global); }
inline void add_bool_feature (hb_tag_t tag, bool global = true, bool has_fallback = false)
{ add_feature (tag, 1, global, has_fallback); }
inline void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func)
{ add_pause (0, pause_func); }
@ -174,6 +174,7 @@ struct hb_ot_map_builder_t
unsigned int seq; /* sequence#, used for stable sorting only */
unsigned int max_value;
bool global; /* whether the feature applies value to every glyph in the buffer */
bool has_fallback; /* whether to allocate bits even if feature not found */
unsigned int default_value; /* for non-global features, what should the unset glyphs take */
unsigned int stage[2]; /* GSUB/GPOS */

6
src/hb-ot-map.cc
View File

@ -60,7 +60,7 @@ hb_ot_map_t::add_lookups (hb_face_t *face,
}
void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value, bool global)
void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value, bool global, bool has_fallback)
{
feature_info_t *info = feature_infos.push();
if (unlikely (!info)) return;
@ -68,6 +68,7 @@ void hb_ot_map_builder_t::add_feature (hb_tag_t tag, unsigned int value, bool gl
info->seq = feature_infos.len;
info->max_value = value;
info->global = global;
info->has_fallback = has_fallback;
info->default_value = global ? value : 0;
info->stage[0] = current_stage[0];
info->stage[1] = current_stage[1];
@ -175,6 +176,7 @@ hb_ot_map_builder_t::compile (hb_face_t *face,
feature_infos[j].global = false;
feature_infos[j].max_value = MAX (feature_infos[j].max_value, feature_infos[i].max_value);
}
feature_infos[j].has_fallback = feature_infos[j].has_fallback || feature_infos[i].has_fallback;
feature_infos[j].stage[0] = MIN (feature_infos[j].stage[0], feature_infos[i].stage[0]);
feature_infos[j].stage[1] = MIN (feature_infos[j].stage[1], feature_infos[i].stage[1]);
/* Inherit default_value from j */
@ -209,7 +211,7 @@ hb_ot_map_builder_t::compile (hb_face_t *face,
language_index[table_index],
info->tag,
&feature_index[table_index]);
if (!found)
if (!found && !info->has_fallback)
continue;