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;
}
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());
}
}
