Patent ID: 6930688
Filing Date: 2005-08-16
Classification: G06T

Abstract:
1. An apparatus for generating a region of graphics on a display, the apparatus comprising: a bus having a first address range and a second address range; a plurality of registers within said first address range configured to store an X coordinate and a Y coordinate of a pixel to be drawn on said display; a memory directly connected to said bus and responsive within said second address range; a calculation circuit configured to calculate an address in said second address range for storage of data corresponding to said pixel in dependence on said X and said Y coordinates; a control circuit configured to control writing of said data in said memory across said bus by driving said address onto said bus; and a clipping circuit for (i) comparing said x and said Y coordinates with predetermined clipping limits and (ii) generating a clipping signal configured to indicate that at least one of said X and said Y coordinates falls outside said predetermined clipping limits; wherein (i) a first register of said registers is memory mapped to a first location and a second location in said first address range and (ii) a second register of said registers is memory mapped to a third location and a fourth location in said first address range.