path: root/man/XGetVisualInfo.man

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.ds xT X Toolkit Intrinsics \- C Language Interface
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.TH XGetVisualInfo __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
.SH NAME
XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo \- obtain visual information and visual structure
.SH SYNTAX
.HP
XVisualInfo *XGetVisualInfo\^(\^Display *\fIdisplay\fP\^, long
\fIvinfo_mask\fP\^, XVisualInfo *\fIvinfo_template\fP\^, int
*\fInitems_return\fP\^); 
.HP
Status XMatchVisualInfo\^(\^Display *\fIdisplay\fP\^, int \fIscreen\fP\^, int
\fIdepth\fP\^, int \fIclass\fP\^, XVisualInfo *\fIvinfo_return\fP\^); 
.HP
VisualID XVisualIDFromVisual\^(\^Visual *\^\fIvisual\fP\^); 
.SH ARGUMENTS
.IP \fIclass\fP 1i
Specifies the class of the screen.
.IP \fIdepth\fP 1i
Specifies the depth of the screen.
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.IP \fInitems_return\fP 1i
Returns the number of matching visual structures.
.IP \fIscreen\fP 1i
Specifies the screen.
.IP \fIvisual\fP 1i
Specifies the visual type.
.IP \fIvinfo_mask\fP 1i
Specifies the visual mask value.
.IP \fIvinfo_return\fP 1i
Returns the matched visual information.
.IP \fIvinfo_template\fP 1i
Specifies the visual attributes that are to be used in matching the visual
structures.
.SH DESCRIPTION
The
.ZN 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,
.ZN XGetVisualInfo
returns a NULL.
To free the data returned by this function, use
.ZN XFree .
.LP
The
.ZN 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,
.ZN XMatchVisualInfo
returns nonzero and the information on the visual to vinfo_return.
Otherwise, when a visual is not found,
.ZN XMatchVisualInfo
returns zero.
.LP
The
.ZN XVisualIDFromVisual
function returns the visual ID for the specified visual type.
.SH STRUCTURES
The
.ZN XVisualInfo
structure contains:
.LP
.LP
/\&* Visual information mask bits */
.TS
lw(.5i) lw(2.5i) lw(.8i).
T{
\&#define
T}	T{
.ZN VisualNoMask
T}	T{
0x0
T}
T{
\&#define
T}	T{
.ZN VisualIDMask
T}	T{
0x1
T}
T{
\&#define
T}	T{
.ZN VisualScreenMask
T}	T{
0x2
T}
T{
\&#define
T}	T{
.ZN VisualDepthMask
T}	T{
0x4
T}
T{
\&#define
T}	T{
.ZN VisualClassMask
T}	T{
0x8
T}
T{
\&#define
T}	T{
.ZN VisualRedMaskMask
T}	T{
0x10
T}
T{
\&#define
T}	T{
.ZN VisualGreenMaskMask
T}	T{
0x20
T}
T{
\&#define
T}	T{
.ZN VisualBlueMaskMask
T}	T{
0x40
T}
T{
\&#define
T}	T{
.ZN VisualColormapSizeMask
T}	T{
0x80
T}
T{
\&#define
T}	T{
.ZN VisualBitsPerRGBMask
T}	T{
0x100
T}
T{
\&#define
T}	T{
.ZN VisualAllMask
T}	T{
0x1FF
T}
.TE
.IN "XVisualInfo" "" "@DEF@"
.Ds 0
/\&* 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;
.De
.SH "SEE ALSO"
XFree(__libmansuffix__)
.br
\fI\*(xL\fP