]> XGetVisualInfo

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 */

Image grohtml-240611.png

/* 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;