XGetVisualInfo
3X11
__xorgversion__
XLIB FUNCTIONS
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 */
T{
#define
.ZN VisualNoMask
0x0
T{
#define
.ZN VisualIDMask
0x1
T{
#define
.ZN VisualScreenMask
0x2
T{
#define
.ZN VisualDepthMask
0x4
T{
#define
.ZN VisualClassMask
0x8
T{
#define
.ZN VisualRedMaskMask
0x10
T{
#define
.ZN VisualGreenMaskMask
0x20
T{
#define
.ZN VisualBlueMaskMask
0x40
T{
#define
.ZN VisualColormapSizeMask
0x80
T{
#define
.ZN VisualBitsPerRGBMask
0x100
T{
#define
.ZN 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