def _marshal_write(source_custom, pointer, length, handle):
buf = ffi.buffer(pointer, length)
callback = ffi.from_handle(handle)
return callback(buf)
def _marshal_image_progress(vi, pointer, handle):
gobject_lib.g_object_ref(vi)
image = pyvips.Image(vi)
callback = ffi.from_handle(handle)
progress = ffi.cast('VipsProgress*', pointer)
callback(image, progress)
def _marshal_seek(source_custom, offset, whence, handle):
callback = ffi.from_handle(handle)
return callback(offset, whence)
def _marshal_finish(source_custom, handle):
callback = ffi.from_handle(handle)
callback()