Apparatus and method for processing graphical information to min

Details Apparatus and method for processing graphical information to min Apparatus and method for processing graphical information to min

1989-01-13

1992-01-07

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340721, 395134, G09G 114, G09G 106

Patent

active

050795457

ABSTRACT:
An apparatus and method for processing graphical information in a manner such that 1) accesses to a frame buffer in which the graphical information is to be stored result in a minimum of page crossings in the frame buffer; and 2) time spent processing graphical information outside a predetermined clip window is minimized. These two goals are sometimes conflicting and the present invention determines how the graphical information should be processed so that frame buffer accesses are always performed with the least overhead. For a given object which is to be displayed within a defined window, by determining the portions of the object which are inside the window and the portions which are outside the window, it frequently is possible to determine whether the object should be drawn from top to bottom, bottom to top, left to right or right to left so as to minimize page crossings and minimize the time spent processing portions of the object outside a predetermined clip window.

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