XGetVisualInfo


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XGetVisualInfo

NAME
SYNTAX
ARGUMENTS
DESCRIPTION
STRUCTURES
SEE ALSO

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






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