Blending with planar maps

Details Blending with planar maps Blending with planar maps

G - Physics

06

T

G06T 1/00 (2006.01) G06F 3/14 (2006.01) G06T 11/60 (2006.01)

Patent

CA 2256913

A system for blending graphical objects using planar map representations is described. A page description representation of an input document's graphical objects is converted, at least in part, into a planar map representation. A color is assigned to each region in the planar map as a function of the region's associated paths' transparency characteristics. In one embodiment, if the graphical processing system exhausts its memory during processing, those paths already converted to planar maps are rasterized. Any subsequent processing of graphical objects is thereafter performed in raster format. In another embodiment, an output page is divided into tiles where each tile may be rasterized independent of the other tiles. In yet another embodiment, graphical objects are processed in reverse order compared to their arrangement in the page description language representation.

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