Handle to the PDF layer object which represents a named object whose state can be toggled in a User Interface to affect changes in visibility of content.

Members:

IG_PDF_layer_create	Creates new layer (optional-content group) object in the document.
IG_PDF_layer_get_name	Gets the layer name.
IG_PDF_layer_set_name	Sets the new layer name.
IG_PDF_layer_get_current_state	Gets the current ON-OFF state of the layer object.
IG_PDF_layer_set_current_state	Sets the current ON-OFF state of the layer object.
IG_PDF_layer_get_initial_state	Gets the initial ON-OFF state of the layer object.
IG_PDF_layer_set_initial_state	Sets the initial ON-OFF state of the layer object.
IG_PDF_layer_has_usage_info	Tests whether a layer object is associated with a Usage dictionary.
IG_PDF_layer_get_usage_info	Gets usage information from a layer object.
IG_PDF_layer_set_usage_info	Sets a Usage dictionary entry in a layer object.
IG_PDF_layer_get_intent	Gets the intent list for a layer.
IG_PDF_layer_set_intent	Sets the Intent entry in a layer's dictionary.
IG_PDF_layer_get_unique_id	Sets a unique ID.
IG_PDF_layer_release	Releases a layer object.
IG_PDF_layer_remove	Destroys layer (optional-content group) object.