XDefault()XDefault()Name
XDefaultColormap, XDefaultColormapOfScreen, XDefaultDepth, XDefault‐
DepthOfScreen, XDefaultGC, XDefaultGCOfScreen, XDefaultRootWindow, XDe‐
faultScreen, XDefaultScreenOfDisplay, XDefaultVisual, XDefaultVisualOf‐
Screen, DefaultColormap, DefaultColormapOfScreen, DefaultDepth,
DefaultDepthOfScreen, DefaultGC, DefaultGCOfScreen, DefaultRootWindow,
DefaultScreen, DefaultScreenOfDisplay, DefaultVisual, DefaultVisualOf‐
Screen – get information on server defaults.
Synopsis
Colormap XDefaultColormap(display, screen_number)
Display *display;
int screen_number;
Colormap XDefaultColormapOfScreen(screen)
Screen *screen;
int XDefaultDepth(display, screen_number)
Display *display;
int screen_number;
int XDefaultDepthOfScreen(screen)
Screen *screen;
GC XDefaultGC(display, screen_number)
Display *display;
int screen_number;
GC XDefaultGCOfScreen(screen)
Screen *screen;
Window XDefaultRootWindow(display)
Display *display;
int XDefaultScreen(display)
Display *display;
Screen *XDefaultScreenOfDisplay(display)
Display *display;
Visual *XDefaultVisual(display, screen_number)
Display *display;
int screen_number;
Visual *XDefaultVisualOfScreen(screen)
Screen *screen;
Arguments
display Specifies a connection to an X server; returned from
XOpenDisplay().
screen_number
Specifies the appropriate screen number on the host server.
screen Specifies the appropriate Screen structure.
Description
This page describes several pairs of functions such as such as XDe‐
faultColormap() and XDefaultColormapOfScreen(). The only difference is
the arguments: one takes a Display pointer and integer screen number,
while the other takes a Screen pointer.
XDefaultScreen() returns the default screen number referenced by the
XOpenDisplay() function. XDefaultScreenOfDisplay() return a pointer to
the Screen structure of the default screen.
XDefaultColormap() and XDefaultColormapOfScreen() return the default
colormap ID on the specified screen. Most routine allocations of color
should be made out of this colormap.
XDefaultDepth() and XDefaultDepthOfScreen() return the depth (number of
planes) of the root window of the specified screen. Other depths may
also be supported on this screen (see XMatchVisualInfo()).
XDefaultGC() and XDefaultGCOfScreen() return the default graphics con‐
text of the specified screen, which has the same depth as the root win‐
dow of the screen. The GC must never be freed.
XDefaultRootWindow() returns the root window of the default screen.
XDefaultVisual() and XDefaultVisualOfScreen() return the default visual
of the specified screen.
The C language macros DefaultColormap(), DefaultColormapOfScreen(),
DefaultDepth(), DefaultDepthOfScreen(), DefaultGC(), DefaultGCOf‐
Screen(), DefaultRootWindow(), DefaultScreen(), DefaultScreenOfDis‐
play(), DefaultVisual(), and DefaultVisualOfScreen() are equivalent and
slightly more efficient.
See AlsoXOpenDisplay().
Xlib - Macro Equivalents XDefault()
