Assigns the specified face-index to face. Fails if the face is immutable.
<note>Note: changing the index has no effect on the face itself This only changes the value returned by harfbuzz.global.faceGetIndex.</note>
A face object
The index to assign
Assigns the specified face-index to face. Fails if the face is immutable.
<note>Note: changing the index has no effect on the face itself This only changes the value returned by harfbuzz.global.faceGetIndex.</note>