/**
* 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 int substituteWithVerticalGlyphs(const SimpleFontData* fontData, uint16_t* glyphs, unsigned bufferLength)
{
HB_FaceRec_* hbFace = fontData->platformData().harfbuzzFace()->face();
if (!hbFace->gsub) {
// if there is no GSUB table, treat it as not covered
return 0Xffff;
}
HB_Buffer buffer;
hb_buffer_new(&buffer);
for (unsigned i = 0; i < bufferLength; ++i)
hb_buffer_add_glyph(buffer, glyphs[i], 0, i);
HB_UShort scriptIndex;
HB_UShort featureIndex;
HB_GSUB_Select_Script(hbFace->gsub, HB_MAKE_TAG('D', 'F', 'L', 'T'), &scriptIndex);
HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'e', 'r', 't'), scriptIndex, 0xffff, &featureIndex);
HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1);
HB_GSUB_Select_Feature(hbFace->gsub, HB_MAKE_TAG('v', 'r', 't', '2'), scriptIndex, 0xffff, &featureIndex);
HB_GSUB_Add_Feature(hbFace->gsub, featureIndex, 1);
int error = HB_GSUB_Apply_String(hbFace->gsub, buffer);
if (!error) {
for (unsigned i = 0; i < bufferLength; ++i)
glyphs[i] = static_cast<Glyph>(buffer->out_string[i].gindex);
}
return error;
}
