Provided is a print engine controller for a pagewidth printhead. The controller includes contone and bi-level decompression circuitry for decompressing a contone layer of compressed page data and a bi-level layer of compressed page data, respectively. The controller also includes halftoner and compositor circuitry for halftoning the decompressed contone layer to associated bi-level versions and compositing the decompressed bi-level layer over the halftoned contone layers. Also included is printhead interface circuitry for receiving the halftoned and composited data so as to generate print data suitable for printing by the printhead. The controller further includes line loader and formatter circuitry for receiving dot data from the halftoner and compositor circuitry to store the dot data for lines to be printed in memory circuitry of the controller and to format said lines into an order required by the printhead interface circuitry.