Don't use a QVector to store the array data

Don't use a QVector to store the array data

Refactor the code to store the array data in a simple
C array. This will later on allow for direct inline
access to the data.

Change-Id: Ic829bf1a90abfcda27ab4291cb7d5721bbd58403
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>