This function finishes the device and drops all references to
external resources. All surfaces, fonts and other objects created
for this device will be finished, too.
Further operations on the device will not affect the device but
will instead trigger a CAIRO_STATUS_DEVICE_FINISHED error.
When the last call to cairo_device_destroy() decreases the
reference count to zero, cairo will call cairo_device_finish() if
it hasn't been called already, before freeing the resources
associated with the device.
This function may acquire devices.
Since 1.10
This function finishes the device and drops all references to external resources. All surfaces, fonts and other objects created for this device will be finished, too. Further operations on the device will not affect the device but will instead trigger a CAIRO_STATUS_DEVICE_FINISHED error. When the last call to cairo_device_destroy() decreases the reference count to zero, cairo will call cairo_device_finish() if it hasn't been called already, before freeing the resources associated with the device. This function may acquire devices. Since 1.10