Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1993-04-28
1994-06-07
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345200, G09G 102
Patent
active
053193954
ABSTRACT:
A pixel-depth converter for source-pixel data having a source-pixel depth to destination-pixel data having a destination-pixel depth which differs from the source-pixel depth. A packed-pixel-data depacker circuit receives source-pixel data words having a packed-pixel data format from a source-pixel-data memory and transmits the data words depacked-pixel-data-word-component-by-depacked-pixel-data-word-component in accordance with a user selected pixel-depth-conversion scale factor. A pixel-data-conversion-table storage circuit stores selectable depth-altering pixel-data-conversion data in locations having conversion-table read addresses which are associated with values corresponding to the selected pixel-depth-conversion scale factor. The storage circuit includes independently-operable converted-data-read parallel output ports and associated conversion-table read-address input ports. Conversion-lookup addresses may be applied independently in parallel to the plurality of conversion-table storage circuit. Stored conversion data can be read in parallel from the associated converted-data-read output ports. Input ports of multiplexers are connected to corresponding terminal subsets of the depacker circuit which are associated with different pixel-depth-conversion scale factor. A conversion-lookup address output port of each multiplexer is connected to an associated read-address input port of the storage circuit. The multiplexer control-signal input ports are connectable to a bus for receiving a scale-factor-selection signal which specifies the desired pixel-depth-conversion scale factor and corresponding depacked-source-pixel-data portions.
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Larky Steven P.
Peevers Alan W.
St. Clair Joe C.
International Business Machines - Corporation
Morris Daniel P.
Oberley Alvin E.
Saras Steven J.
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