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Chapter 8 - Video Digitizer Components / Video Digitizer Components Reference

Video Digitizer Component Functions / Selectively Displaying Video

VDAddKeyColor

Some video digitizer components can support more than one active key color. The VDAddKeyColor function allows applications to add a key color to a component's list of active key colors.

pascal VideoDigitizerError VDAddKeyColor
                                  (VideoDigitizerComponent ci,
                                    long *index);

ci

Specifies the video digitizer component for the request. Applications obtain this reference from the Component Manager's OpenComponent function.

index

Contains a pointer to the color to add to the key color list. The value of the index field corresponds to a color in the current color lookup table.

DESCRIPTION

If the digitizer component cannot accommodate any more key colors, it returns a result code of noMoreKeyColors.

RESULT CODES

noErr	0	No error
digiUnimpErr	-2201	Function not supported
qtParamErr	-2202	Invalid parameter value
noMoreKeyColors	-2205	Key color list is full

SEE ALSO

To ensure that the key color list contains only the desired colors, your application should use the VDSetKeyColor function (described on page 8-82) to set the first key color.