Multi-source printer controller

Details Multi-source printer controller Multi-source printer controller

G - Physics

09

G

G09G 5/36 (2006.01) G06F 3/12 (2006.01) H04N 1/387 (2006.01) H04N 1/46 (2006.01)

Patent

CA 2061057

A circuit for enabling the raster display of text or line art in one constant color against a background of another constant color or against a continuous- tone picture, or the display of a continuous-tone picture through an arbitrary shape. The circuit has four channels, one each for constant colors, continuous-tone images, image masks, and instructions. The constant colors are stored in the first channel in the form of two 8-bit colors, one for the text or line art and one for the background. Any color pair can be read from this memory, divided into two 8-bit colors, and presented at two inputs of a final multiplexer. The second channel stores continuous tone color pictures and presents this information at a third input of the multiplexer. The third channel receives masks or outlines in the form of bitmaps and the fourth channel receives instructions which may be run-length encoded. These two channels combine their data, which is then used to control the multiplexes.

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