The functions in this section use the visual information masks and the XVisualInfo structure, which is defined in X11/Xutil.h and contains:
/* Visual information mask bits */
#define VisualNoMask 0x0
#define VisualIDMask 0x1
#define VisualScreenMask 0x2
#define VisualDepthMask 0x4
#define VisualClassMask 0x8
#define VisualRedMaskMask 0x10
#define VisualGreenMaskMask 0x20
#define VisualBlueMaskMask 0x40
#define VisualColormapSizeMask 0x80
#define VisualBitsPerRGBMask 0x100
#define VisualAllMask 0x1FF
/* Values */
typedef struct {
Visual *visual;
VisualID visualid;
int screen;
unsigned int depth;
int class;
unsigned long red_mask;
unsigned long green_mask;
unsigned long blue_mask;
int colormap_size;
int bits_per_rgb;
} XVisualInfo;
To obtain a list of visual information structures that match a specified template, use XGetVisualInfo().
To obtain the visual information that matches the specified depth and class of the screen, use XMatchVisualInfo().