DISPLAY OVERLAY Clause Samples

DISPLAY OVERLAY. Display overlay of multiple images may be required if sprite performance is less than optimal. There can be up to four overlay images. The HV starting position and size of each image can vary. Wraparound of images during display is supported. Images can be less than full screen size. The images are combined in a fixed priority order. The combination is by pixel selection between images, and there is no blending between images during overlay display. A line buffer may be maintained to combine overlay images and perform line averaging.