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Man Pages


Manual Reference Pages  -  XVISUALIDFROMVISUAL (3)

NAME

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

CONTENTS

Syntax
Arguments
Description
Structures

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 */

#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; 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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X Version 11 XGETVISUALINFO (3) libX11 1.6.3

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