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     The _getvideoconfig function returns the current graphics
     environment configuration in a videoconfig structure (defined in
     GRAPH.H).
 
     The values returned reflect the currently active monitor and the
     currently specified video mode.
 
     The videoconfig structure contains the following elements:
 
     Element           Contents
 
     numxpixels        Number of pixels on the x axis
     numypixels        Number of pixels on the y axis
     numtextcols       Number of text columns available
     numtextrows       Number of text rows available
     numcolors         Number of actual colors available
     bitsperpixel      Number of bits per pixel
     numvideopages     Number of available video pages
     mode              Current video mode
     adapter           Active display adapter
     monitor           Active display monitor
     memory            Adapter video memory in kilobytes
 
     The values for the adapter element of the videoconfig structure
     are given by the manifest constants shown in the list below.
 
     Note that for any applicable adapter (_CGA, _EGA, or _VGA), the
     corresponding Olivetti(R) adapter (_OCGA, _OEGA, or _OVGA)
     represents a superset of graphics capabilities.
 
     Constant     Meaning
 
     _MDPA        Monochrome Display Printer Adapter
     _CGA         Color Graphics Adapter
     _OCGA        Olivetti (AT&T) Color Graphics Adapter
     _EGA         Enhanced Graphics Adapter
     _OEGA        Olivetti (AT&T) Enhanced Graphics Adapter
     _VGA         Video Graphics Array
     _OVGA        Olivetti (AT&T) Video Graphics Array
     _MCGA        Multicolor Graphics Array
     _HGC         Hercules(R) Graphics Card
 
     The values for the monitor element of the videoconfig structure
     are given by the manifest constants listed below:
 
     Constant         Meaning
 
     _MONO            Monochrome monitor
     _COLOR           Color (or enhanced monitor emulating color)
     _ENHCOLOR        Enhanced color
     _ANALOGMONO      Analog (monochrome only)
     _ANALOGCOLOR     Analog (color only)
     _ANALOG          Analog (monochrome and color modes)
 
     In every text mode, including monochrome, the _getvideoconfig
     function returns the value 32 for the number of available colors.
     The value 32 indicates the range of values (0-31) accepted by the
     _settextcolor function. This includes sixteen normal colors (0-15)
     and sixteen blinking colors (16-31). Blinking is selected by
     adding 16 to the normal color value.
 
     Monochrome text mode has fewer unique display attributes, so some
     color values are redundant. However, because blinking is selected
     in the same manner, monochrome text mode has the same range (0-31)
     as other text modes.
 
     Return Value
 
     The _getvideoconfig function returns the video configuration in a
     structure as noted above. There is no error return.
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