Apparatus and method for processing graphical information to...

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

G - Physics

09

G

375/12, 354/126

G09G 5/36 (2006.01) G06T 15/30 (2006.01)

Patent

CA 1320585

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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