1XGetVisualInfo(3)               XLIB FUNCTIONS               XGetVisualInfo(3)
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NAME

6       XGetVisualInfo,  XMatchVisualInfo,  XVisualIDFromVisual,  XVisualInfo -
7       obtain visual information and visual structure
8

SYNTAX

10       XVisualInfo *XGetVisualInfo(Display *display, long vinfo_mask, XVisual‐
11              Info *vinfo_template, int *nitems_return);
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13       Status  XMatchVisualInfo(Display  *display,  int screen, int depth, int
14              class, XVisualInfo *vinfo_return);
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16       VisualID XVisualIDFromVisual(Visual *visual);
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ARGUMENTS

19       class     Specifies the class of the screen.
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21       depth     Specifies the depth of the screen.
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23       display   Specifies the connection to the X server.
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25       nitems_return
26                 Returns the number of matching visual structures.
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28       screen    Specifies the screen.
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30       visual    Specifies the visual type.
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32       vinfo_mask
33                 Specifies the visual mask value.
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35       vinfo_return
36                 Returns the matched visual information.
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38       vinfo_template
39                 Specifies the visual attributes that are to be used in match‐
40                 ing the visual structures.
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DESCRIPTION

43       The  XGetVisualInfo  function  returns a list of visual structures that
44       have attributes equal to the attributes  specified  by  vinfo_template.
45       If  no  visual  structures  match  the  template  using  the  specified
46       vinfo_mask, XGetVisualInfo returns a NULL.  To free the  data  returned
47       by this function, use XFree.
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49       The XMatchVisualInfo function returns the visual information for a vis‐
50       ual that matches the specified depth and class for a  screen.   Because
51       multiple  visuals  that  match the specified depth and class can exist,
52       the exact visual chosen is undefined.  If a visual is found,  XMatchVi‐
53       sualInfo returns nonzero and the information on the visual to vinfo_re‐
54       turn.  Otherwise, when a visual is not found, XMatchVisualInfo  returns
55       zero.
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57       The  XVisualIDFromVisual  function returns the visual ID for the speci‐
58       fied visual type.
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STRUCTURES

61       The XVisualInfo structure contains:
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63       /* Visual information mask bits */
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67       #de‐    VisualNoMask                0x0
68       fine
69       #de‐    VisualIDMask                0x1
70       fine
71       #de‐    VisualScreenMask            0x2
72       fine
73       #de‐    VisualDepthMask             0x4
74       fine
75       #de‐    VisualClassMask             0x8
76       fine
77       #de‐    VisualRedMaskMask           0x10
78       fine
79       #de‐    VisualGreenMaskMask         0x20
80       fine
81       #de‐    VisualBlueMaskMask          0x40
82       fine
83       #de‐    VisualColormapSizeMask      0x80
84       fine
85       #de‐    VisualBitsPerRGBMask        0x100
86       fine
87       #de‐    VisualAllMask               0x1FF
88       fine
89       /* Values */
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91       typedef struct {
92               Visual *visual;
93               VisualID visualid;
94               int screen;
95               int depth;
96               int class;
97               unsigned long red_mask;
98               unsigned long green_mask;
99               unsigned long blue_mask;
100               int colormap_size;
101               int bits_per_rgb;
102       } XVisualInfo;
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SEE ALSO

105       XFree(3)
106       Xlib - C Language X Interface
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110X Version 11                     libX11 1.8.7                XGetVisualInfo(3)
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