Video graphics system equipped with a graphics cursor

Claim 1

A video graphics system equipped with a graphics cursor and with a comparator which compares the positional co-ordinates X C , Y C of the graphics cursor with the co-ordinates X D , Y D of each image element of each line, the elements being explored in accordance with a scanning by frames, the graphics cursor interacting with the image delivered by the video graphics system, characterized in that said video graphics system comprises: an image memory which, in the course of successive loadings, temporarily stores: (a) numerical parameters describing encoded surfaces relating to two-dimensional images, (b) and an N bit identifier, specific to an encoded surface in such a manner that the N bits are successively loaded into said image memory by slices of N/P bits in the course of P successive loadings, where N and P are integers and P is greater than 1 , each loading being followed by a reading of the image memory in order to display the image visually in accordance with the successive frames of the scanning by frames, p1 and a graphics controller which receives the slices of N/P bits at each read frame and reconstructs the N bit identifier of said encoded surface after P successive frames, said graphics controller comprising an identification circuit comprising the comparator and an identification memory which accumulates and stores the slices of N/P bits once the comparator has detected the identity of the co-ordinates X C , Y C and co-ordinates X D , Y D , the complete identifier stored, in said identification memory being used by the video graphics controller to identify said encoded surface.