VisualRec(D4nfb)

VisualRec -- visual record structure defining a drawables visual class

Synopsis

#include "scrnintstr.h"

Description

Structure definition

typedef struct _Visual {
	unsigned long vid;
	short class;
	short bitsPerRGBValue;
	short ColormapEntries;
	short nplanes;
	unsigned long redMask, greenMask, blueMask;
	init offsetRed, offsetGreen, offsetBlue;
} VisualRec;

Structure members

The members are:

vid: visual ID. This is assigned by the nfbAddVisual(D3nfb) routine.
class: visual class as defined in the ../X11/X11/Xproto.h header file. Valid values are: StaticGray, GrayScale, StaticColor, PseudoColor, TrueColor, or DirectColor.
bitsPerRGBValue: number of bits used to represent an RGB value in the hardware
ColormapEntries: number of entries in the colormap
nplanes: log2 of ColorMapEntries. It can be less than or greater than the actual number of planes.
redMask, greenMask, blueMask: mask used to pull the red, green, and blue value from a pixel. This is only used by TrueColor and DirectColor visual types.
offsetRed, offsetGreen, offsetBlue: bit offset of the red, green, and blue values in a pixel. This is only used by TrueColor and DirectColor visual types.

Version applicability

This structure is supported for NFB drivers on all releases of SCO OpenServer 5, SVR5, and AIX 5L.

References

nfbAddVisual(D3nfb), nfbScreenInit(D3nfb)

For more information about Visuals and X color models, see Chapter 11 in Nabajyoti Barkakati, X Window System Programming, Second Edition.