varframe buffer user defined part of display
infoframe buffer info structure
mode_optionvideo mode name (see mac_modedb[])
default_bppdefault color depth in bits per pixel
Finds a suitable video mode. Tries to set mode specified
by mode_option. If the name of the wanted mode begins with
'mac', the Mac video mode database will be used, otherwise it
will fall back to the standard video mode database.