NAME¶

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

SYNTAX¶

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

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

VisualID XVisualIDFromVisual(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 XGetVisualInfo 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, XGetVisualInfo returns a NULL. To free the data returned by this function, use XFree.

The XMatchVisualInfo 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, XMatchVisualInfo returns nonzero and the information on the visual to vinfo_return. Otherwise, when a visual is not found, XMatchVisualInfo returns zero.

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

STRUCTURES¶

The XVisualInfo structure contains:

/* Visual information mask bits */

/* Values */
typedef struct {


        Visual *visual;


        VisualID visualid;


        int screen;


        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(3)
Xlib - C Language X Interface