Package org.freedesktop.harfbuzz

Interface BufferMessageFunc

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("io.github.jwharm.JavaGI")
public interface BufferMessageFunc
extends FunctionPointer

Functional interface declaration of the BufferMessageFunc callback.

See Also:

• run(org.freedesktop.harfbuzz.Buffer, org.freedesktop.harfbuzz.Font, java.lang.String)

Method Summary

Modifier and Type	Method	Description
Bool	run(Buffer buffer, Font font, String message)	A callback method for hb_buffer_t.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.
default int	upcall(MemorySegment buffer, MemorySegment font, MemorySegment message, MemorySegment userData)	The upcall method is called from native code.

Method Details

run

Bool run(Buffer buffer,
 Font font,
 String message)

A callback method for hb_buffer_t. The method gets called with the hb_buffer_t it was set on, the hb_font_t the buffer is shaped with and a message describing what step of the shaping process will be performed. Returning false from this method will skip this shaping step and move to the next one.

upcall

default int upcall(MemorySegment buffer,
 MemorySegment font,
 MemorySegment message,
 MemorySegment userData)

The upcall method is called from native code. The parameters are marshaled and run(org.freedesktop.harfbuzz.Buffer, org.freedesktop.harfbuzz.Font, java.lang.String) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment, java.lang.foreign.MemorySegment) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the function pointer will be allocated in this arena

Returns:

the native function pointer