Increases the reference count on device by one. This prevents
device from being destroyed until a matching call to
cairo_device_destroy() is made.
The number of references to a cairo_device_t can be get using
cairo_device_get_reference_count().
Since 1.10
Increases the reference count on device by one. This prevents device from being destroyed until a matching call to cairo_device_destroy() is made. The number of references to a cairo_device_t can be get using cairo_device_get_reference_count(). Since 1.10