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(11) | EP 0 457 039 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Pixel-depth converter for a computer video display |
| (57) A pixel-depth converter for converting source-pixel data having a source-pixel depth
to destination-pixel data having a destination-pixel depth which differs from the
source-pixel depth by a user-selectable pixel-depth-conversion scale factor includes
a packed-pixel-data depacker circuit, a pixel-data-conversion-table storage circuit
and a plurality of conversion-table address-selector multiplexers. The packed-pixel-data
depacker circuit receives source-pixel data words 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 the selected pixel-depth-conversion scale factor. The pixel-data-conversion-table
storage circuit stores user-selectable depth-altering pixel-data-conversion data in
locations having conversion-table read addresses which are associated with values
of depacked-source-pixel-data portions corresponding to the selected pixel-depth-conversion
scale factor. The pixel-data-conversion-table storage circuit includes a plurality
of independently-operable converted-data-read parallel output ports and a like plurality
of associated conversion-table read-address input ports. |