XGetVisualInfo man page on BSDOS

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XGetVisualInfo(3X11)	XLIB FUNCTIONS	   XGetVisualInfo(3X11)

NAME
       XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual,
       XVisualInfo - obtain visual information and visual struc-
       ture

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 struc-
		 tures.

       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,

X Version 11		Release 6.4				1

XGetVisualInfo(3X11)	XLIB FUNCTIONS	   XGetVisualInfo(3X11)

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

       The XMatchVisualInfo function returns the visual informa-
       tion 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, XMatchVisual-
       Info 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	VisualNoMask		0x0
       #define	VisualIDMask		0x1
       #define	VisualScreenMask	    0x2
       #define	VisualDepthMask	     0x4
       #define	VisualClassMask	     0x8
       #define	VisualRedMaskMask	   0x10
       #define	VisualGreenMaskMask	 0x20
       #define	VisualBlueMaskMask	  0x40
       #define	VisualColormapSizeMask	0x80
       #define	VisualBitsPerRGBMask	0x100
       #define	VisualAllMask		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

X Version 11		Release 6.4				2

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