Technical data

cgfour(7D) Devices SunOS 5.5
NAME cgfour − P4-bus 8-bit color memory frame buffer
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 driver uses color board vertical-retrace interrupts to load the colormap.
The cgfour has an overlay plane colormap, which is accessed by encoding the plane
group into the index value with thePIX_GROUP macro (see <sys/pr_planegroups.h>).
FILES /dev/fbs/cgfour0
SEE ALSO mmap(2), fbio(7I)
7D-62 modified 27 Mar 1992