VipsGenerateFn

int
(* VipsGenerateFn) (
  VipsRegion* out,
  void* seq,
  void* a,
  void* b,
  gboolean* stop
)

Fill out->valid with pixels. seq contains per-thread state, such as the input regions. Set stop to TRUE to stop processing.

See also: vips_image_generate(), vips_stop_many().

`out`	`VipsRegion`
	`VipsRegion` to fill.
	The data is owned by the caller of the function.
`seq`	`void*`
	Sequence value.
	The argument can be `NULL`.
	The data is owned by the caller of the function.
`a`	`void*`
	User data.
	The argument can be `NULL`.
	The data is owned by the caller of the function.
`b`	`void*`
	User data.
	The argument can be `NULL`.
	The data is owned by the caller of the function.
`stop`	`gboolean*`
	Set this to stop processing.
	The data is owned by the caller of the function.

Returns:	`int`
	0 on success, -1 on error.