Some of the display information is initialized in ROM for each mode such
as recommended nominal (or default) dimensions.  Even though this
information is presumably static, it would still be a mistake to hardcode
assumptions about these nominal values into your code.

Gathering information about the nominal dimensions of various modes is
handled in a fashion similar to to the basic queries above.  Here is an
example of how to query the nominal dimensions of a given mode from a
displayinfohandle.


#include <graphics/displayinfo.h>

check_dimensions( handle )
DisplayInfoHandle handle;
{
    struct DimensionInfo query;

    /* fill the buffer with Mode dimension information */

    if(GetDisplayInfoData(handle, (UBYTE *)&query,sizeof(query),
       DTAG_DIMS,NULL)))
    {
        /* display Nominal dimensions of this Mode */

        printf("nominal width  = %ld",
                query.Nominal.MaxX - query.Nominal.MinX + 1);

        printf("nominal height = %ld",
                query.Nominal.MaxY - query.Nominal.MinY + 1);
    }
}