/**
* pango_ot_ruleset_substitute:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GSUB substitution on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_substitute (const PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
HB_GSUB gsub = NULL;
g_return_if_fail (PANGO_IS_OT_RULESET (ruleset));
g_return_if_fail (ruleset->info != NULL);
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GSUB)
continue;
if (!gsub)
{
gsub = pango_ot_info_get_gsub (ruleset->info);
if (gsub)
HB_GSUB_Clear_Features (gsub);
else
return;
}
HB_GSUB_Add_Feature (gsub, rule->feature_index, rule->property_bit);
}
HB_GSUB_Apply_String (gsub, buffer->buffer);
}
static void setupFontFeatures(const FontFeatureSettings* settings, HB_FaceRec_* hbFace)
{
if (!settings)
return;
if (hbFace->gsub)
HB_GSUB_Clear_Features(hbFace->gsub);
if (hbFace->gpos)
HB_GPOS_Clear_Features(hbFace->gpos);
HB_UShort scriptIndex = 0;
HB_GSUB_Select_Script(hbFace->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &scriptIndex);
size_t numFeatures = settings->size();
for (size_t i = 0; i < numFeatures; ++i) {
if (!settings->at(i).value())
continue;
HB_UShort featureIndex = 0;
const UChar* tag = settings->at(i).tag().characters();
HB_UInt feature = HB_MAKE_TAG(tag[0], tag[1], tag[2], tag[3]);
if (hbFace->gsub && HB_GSUB_Select_Feature(hbFace->gsub, feature, scriptIndex, 0xffff, &featureIndex) == HB_Err_Ok)
HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, settings->at(i).value());
else if (hbFace->gpos && HB_GPOS_Select_Feature(hbFace->gpos, feature, scriptIndex, 0xffff, &featureIndex) == HB_Err_Ok)
HB_GPOS_Add_Feature(hbFace->gpos, featureIndex, settings->at(i).value());
}
}
