.
1. NAME▲
XGetVisualInfo, XMatchVisualInfo, XVisualIDFromVisual, XVisualInfo - obtain visual information and visual structure
2. 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);
3. ARGUMENTS ▲
class 1i Specifies the class of the screen.
depth 1i Specifies the depth of the screen.
display 1i Specifies the connection to the X server.
nitems_return 1i Returns the number of matching visual structures.
screen 1i Specifies the screen.
visual 1i Specifies the visual type.
vinfo_mask 1i Specifies the visual mask value.
vinfo_return 1i Returns the matched visual information.
vinfo_template 1i Specifies the visual attributes that are to be used in matching the visual structures.
4. 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 .
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.
The .ZN XVisualIDFromVisual function returns the visual ID for the specified visual type.
5. STRUCTURES ▲
The .ZN XVisualInfo structure contains:
/* Visual information mask bits */
| 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} |
.TA .5i 3i .5i 3i /* 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
6. SEE ALSO ▲
XFree(3)
\*(xL
