Returns whether the surface supports sophisticated showTextGlyphs()
operations. That is, whether it actually uses the provided text
and cluster data to a showTextGlyphs() call.
Note:
Even if this function returns false, a showTextGlyphs()
operation targeted at surface will still succeed. It just will
act like a showGlyphs() operation. Users can use this
function to avoid computing UTF-8 text and cluster mapping
if the target surface does not use it.
Returns whether the surface supports sophisticated showTextGlyphs() operations. That is, whether it actually uses the provided text and cluster data to a showTextGlyphs() call.
Note: Even if this function returns false, a showTextGlyphs() operation targeted at surface will still succeed. It just will act like a showGlyphs() operation. Users can use this function to avoid computing UTF-8 text and cluster mapping if the target surface does not use it.