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wdisplay pixel format

I am implementing a device driver using wscons for my display device.

Does anyone know how a user land program that opens the device (such as X11) 
will know what the pixel format will be for the frame buffer?

I  see there is an ioctl tag WSDISPLAYIO_GTYPE to get display type, 
WSDISPLAYIO_GINFO to get frame buffer metrics height, width, depth, cmsize, and 
WSDISPLAYIO_LINEBYTES to get the stride. But how does the program that opens 
the device know the pixel format?

I can seem to find this documented anywhere, nor can I find any code to discern 
this from.

Frank Zerangue

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