XGetVisualInfo - Online Linux Manual Page
Section : 3
Updated : libX11 1.8.4
Source : X Version 11
Note : XLIB FUNCTIONS
NAMEXGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo − obtain visual information and visual structure
SYNTAXXVisualInfo *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 );
ARGUMENTSclass 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.
DESCRIPTIONThe 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.
STRUCTURESThe 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;
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 ALSOXFree(3)
Xlib − C Language X Interface 0
Johanes Gumabo
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