Microsoft KB Archive/105500

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UNIDRV Does Not Send Black Plane to Dump Function

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Q105500

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The information in this article applies to:


 * Microsoft Windows Device Development Kit (DDK) for Windows, version 3.1

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SUMMARY
If a minidriver implements its own Dump function, it must handle black extraction in that function.

UNIDRV.DLL does not create a separate black plane in the PDEVICE structure that is passed to the Dump function. UNIDRV processes the output for a three- and four-color printer exactly the same until it reaches the Dump function. If the DC_EXTRACT_BLACK bit is set in UNITOOL and the number of color planes is set to 4, then UNIDRV will extract the black plane in its own Dump function.

This extraction is performed by removing black bits from (r,g,b) planes and putting them in the black plane. For every bit, (r,g,b) is checked to determine whether it is (0,0,0) (black). If true, that bit is set in the black plane, and cleared in (r,g,b).

Additional query words: 3.10

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