def process(self, text):
if not text:
return []
if self._needsInternalUpdate:
self._updateEngine()
# TODO: reuse buffer?
buf = hb.Buffer.create()
if isinstance(text, list):
unicodes = []
for name in text:
# TODO: use a dict instead?
gid = self._glyphOrder.index(name)
unicodes.append(CH_GID_PREFIX + gid)
buf.add_codepoints(unicodes, len(unicodes), 0, len(unicodes))
else:
buf.add_str(text)
buf.guess_segment_properties()
hb.shape(self._hbFont, buf, list(self._fontFeatures.values()))
glyphRecords = []
for info, pos in zip(buf.glyph_infos, buf.glyph_positions):
glyphName = self._glyphOrder[info.codepoint]
if glyphName not in self.font:
continue
record = GlyphRecord()
record.glyph = self.font[glyphName]
record.cluster = info.cluster
record.xOffset = pos.x_offset
record.yOffset = pos.y_offset
record.xAdvance = pos.x_advance
record.yAdvance = pos.y_advance
glyphRecords.append(record)
del buf
return glyphRecords
def _shapeAndSetText(self):
font = self._font
records = font.engine.process(self._glyphList)
if self._shaper == 'compositor':
records_ = []
index = 0
for glyphRecord in records:
record_ = GlyphRecord()
record_.glyph = glyph = font[glyphRecord.glyphName]
record_.cluster = index
record_.xOffset = glyphRecord.xPlacement
record_.yOffset = glyphRecord.yPlacement
record_.xAdvance = glyph.width + glyphRecord.xAdvance
record_.yAdvance = glyph.height + glyphRecord.yAdvance
records_.append(record_)
index += len(glyphRecord.ligatureComponents) or 1
records = records_
self.parent().setGlyphRecords(records)