Patent ID: 6765581
Filing Date: 2004-07-20
Classification: G06T

Abstract:
A graphics system for rotating an image for display from a first orientation to a second orientation comprising:a first input that receives image pixel data signals representing picture elements successively in columns across rows, and in rows across a screen; a second input that receives image pixel address signals successively identifying the row and column of corresponding pixel data signals in the first orientation; an address translation system that receives said image pixel address signals and translates them into translated address signals successively identifying the column and row of corresponding pixel data signals representing picture elements successively in rows across columns, and in columns across a screen in the second orientation, and selectively outputs one of said image pixel address signals and said translated address signals as logical address signals; refresh logic that generates screen refresh address signals; a multiplexer that receives said logical address signals and said refresh address signals, and is responsive to a select signal to select one of said address signals and pass it as a memory address signal; and a memory address arbitrator that generates said select signal.