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CentOS 7.0 - man page for xgetvisualinfo (centos section 3)

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XGetVisualInfo(3)			  XLIB FUNCTIONS			XGetVisualInfo(3)

       XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo - obtain visual infor-
       mation and visual structure

       XVisualInfo *XGetVisualInfo(Display *display, long vinfo_mask, XVisualInfo *vinfo_tem-
	      plate, int *nitems_return);

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

       VisualID XVisualIDFromVisual(Visual *visual);

       class	 Specifies the class of the screen.

       depth	 Specifies the depth of the screen.

       display	 Specifies the connection to the X server.

		 Returns the number of matching visual structures.

       screen	 Specifies the screen.

       visual	 Specifies the visual type.

		 Specifies the visual mask value.

		 Returns the matched visual information.

		 Specifies the visual attributes that are to be used in matching the visual

       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.  Oth-
       erwise, when a visual is not found, XMatchVisualInfo returns zero.

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

       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;
	       int depth;
	       int class;
	       unsigned long red_mask;
	       unsigned long green_mask;
	       unsigned long blue_mask;
	       int colormap_size;
	       int bits_per_rgb;
       } XVisualInfo;

       Xlib - C Language X Interface

X Version 11				   libX11 1.6.0 			XGetVisualInfo(3)
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