XGetVisualInfo(3X11) MIT X11R4 XGetVisualInfo(3X11)
Name
XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo - obtain visual information and visual structure
Syntax
XVisualInfo *XGetVisualInfo(display, vinfo_mask, vinfo_template, nitems_return)
Display *display;
long vinfo_mask;
XVisualInfo *vinfo_template;
int *nitems_return;
Status XMatchVisualInfo(display, screen, depth, class, vinfo_return)
Display *display;
int screen;
int depth;
int class;
XVisualInfo *vinfo_return;
VisualID XVisualIDFromVisual(visual)
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 function returns a list of visual structures that match the attributes specified by vinfo_template. If no visual structures match the
template using the specified vinfo_mask, returns a NULL. To free the data returned by this function, use
The 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, returns nonzero and the
information on the visual to vinfo_return. Otherwise, when a visual is not found, returns zero.
The function returns the visual ID for the specified visual type.
Structures
The structure contains:
/* Visual information mask bits */
#define 0x0
#define 0x1
#define 0x2
#define 0x4
#define 0x8
#define 0x10
#define 0x20
#define 0x40
#define 0x80
#define 0x100
#define 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)
X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys
XGetVisualInfo(3X11)
