Returns a blob that represents a range of bytes in parent. The new
blob is always created with #HB_MEMORY_MODE_READONLY, meaning that it
will never modify data in the parent blob. The parent data is not
expected to be modified, and will result in undefined behavior if it
is.
New blob, or the empty blob if something failed or if
length is zero or offset is beyond the end of parent's data. Destroy
with harfbuzz.global.blobDestroy.
Returns a blob that represents a range of bytes in parent. The new blob is always created with #HB_MEMORY_MODE_READONLY, meaning that it will never modify data in the parent blob. The parent data is not expected to be modified, and will result in undefined behavior if it is.
Makes parent immutable.