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 */

       #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;

SEE ALSO

       XFree(3)
       Xlib - C Language X Interface