Interface ReferenceTableFunc

All Superinterfaces:

FunctionPointer

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
@Generated("org.javagi.JavaGI")
public interface ReferenceTableFunc
extends FunctionPointer

Functional interface declaration of the ReferenceTableFunc callback.

See Also:

• run(Face, Tag)

Method Summary

Modifier and Type	Method	Description
Blob	run(Face face, Tag tag)	Callback function for hb_face_create_for_tables().
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(MemorySegment, int, MemorySegment) method.
default MemorySegment	upcall(MemorySegment face, int tag, MemorySegment userData)	The upcall method is called from native code.

Method Details

run

Blob run(Face face,
 Tag tag)

Callback function for hb_face_create_for_tables(). The tag is the tag of the table to reference, and the special tag HB_TAG_NONE is used to reference the blob of the face itself. If referencing the face blob is not possible, it is recommended to set hb_get_table_tags_func_t on the face to allow hb_face_reference_blob() to create a face blob out of individual table blobs.

Parameters:

face - an hb_face_t to reference table for

tag - the tag of the table to reference

Returns:

A pointer to the tag table within face or NULL if the table is not found or cannot be referenced.

Since:

0.9.2

upcall

default MemorySegment upcall(MemorySegment face,
 int tag,
 MemorySegment userData)

The upcall method is called from native code. The parameters are marshaled and run(Face, Tag) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(MemorySegment, int, MemorySegment) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer