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Name

Synopsis

/dev/fbs/cgfourn

Description

The cgfour is a color memory frame buffer with a monochrome overlay plane and an overlay enable plane. It provides the standard frame buffer interface as defined in fbio(7I) .

In addition to the ioctls described under fbio(7I) , the cgfour interface responds to two cgfour-specific colormap ioctls, FBIOPUTCMAP and FBIOGETCMAP . FBIOPUTCMAP returns no information other than success/failure using the ioctl return value. FBIOGETCMAP returns its information in the arrays pointed to by the red, green, and blue members of its fbcmap structure argument; fbcmap is defined in <sys/fbio.h> as:

struct fbcmap {
    int        index;        /* first element (0 origin) */
    int        count;        /* number of elements */
    unsigned char    *red;        /* red color map elements */
    unsigned char    *green;        /* green color map elements */
    unsigned char    *blue;        /* blue color map elements */
};

The cgfour has an overlay plane colormap, which is accessed by encoding the plane group into the index value with the PIX_GROUP macro (see <sys/pr_planegroups.h>).

Files

/dev/fbs/cgfour0

See Also

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