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XGetVisualInfo(3X11) XLIB FUNCTIONS XGetVisualInfo(3X11)
NAME
XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo -
obtain visual information and visual structure
SYNTAX
XVisualInfo *XGetVisualInfo(Display *display, long vinfo_mask, XVisual-
Info *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 match-
ing 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 speci-
fied 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 libX11 1.0.3 XGetVisualInfo(3X11)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Sat Sep 8 16:36:55 GMT 2007
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