XGetVisualInfo(3X11)

NAME
XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo - obtain visual information and visual structure

SYNTAX
XVisualInfo *XGetVisualInfo(display, vinfo_mask, vinfo_template, nitems_return)
      Display *display;
      long vinfo_mask;
      XVisualInfo *vinfo_template;
      int *nitems_return;

Status XMatchVisualInfo(display, screen, depth, class, vinfo_return)
      Display *display;
      int screen;
      int depth;
      int class;
      XVisualInfo *vinfo_return;

VisualID XVisualIDFromVisual(visual)
       Visual *visual;

ARGUMENTS

class
    Specifies the class of the screen.

depth
    Specifies the depth of the screen.

display
    Specifies the connection to the X server.

nitems_return
    Returns the number of matching visual structures.

screen
    Specifies the screen.

visual
    Specifies the visual type.

vinfo_mask
    Specifies the visual mask value.

vinfo_return
    Returns the matched visual information.

vinfo_template
    Specifies the visual attributes that are to be used in matching the visual structures.

DESCRIPTION
The function returns a list of visual structures that have attributes equal to the attributes specified by vinfo_template. If no visual structures match the template using the specified vinfo_mask, returns a NULL. To free the data returned by this function, use

The function returns the visual information for a visual that matches the specified depth and class for a screen. Because multiple visuals that match the specified depth and class can exist, the exact visual chosen is undefined. If a visual is found, returns nonzero and the information on the visual to vinfo_return. Otherwise, when a visual is not found, returns zero.

The function returns the visual ID for the specified visual type.

STRUCTURES
The structure contains:

/* Visual information mask bits */
#define |  | 0x0
#define |  | 0x1
#define |  | 0x2
#define |  | 0x4
#define |  | 0x8
#define |  | 0x10
#define |  | 0x20
#define |  | 0x40
#define |  | 0x80
#define |  | 0x100
#define |  | 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;

SEE ALSO
XFree(3X11)
Xlib - C Language X Interface