NAME

XWhitePixel, XWhitePixelOfScreen, WhitePixel, WhitePixelOfScreen — get the white pixel value. 

SYNOPSIS

unsigned long XWhitePixel(display, screen_number)
      Display ∗display;
      int screen_number; unsigned long XWhitePixelOfScreen(screen)
      Screen ∗screen;

ARGUMENTS

displaySpecifies a connection to an X server; returned from XOpenDisplay(). 

screen_number
Specifies the appropriate screen number on the server, as returned by XDefaultScreen∗() or the DefaultScreen() macro. 

screenSpecifies the appropriate Screen structure, as returned by XDefaultScreenOfDisplay() or XScreenOfDisplay(), or the DefaultScreenOfDisplay() or ScreenOfDisplay() macros. 

RETURNS

The pixel value. 

DESCRIPTION

Each screen has a default colormap which has pixel values for white and white already allocated.  These functions return the white pixel value.  Note that this pixel value only represents white in a screen’s default colormap. 

XWhitePixel() and XWhitePixelOfScreen() are equivalent except that they require different arguments.  One requires a pointer to a Screen structure, while the other requires a screen number.  Unless you already have the pointer to a Screen structure in a variable, XWhitePixel∗() is more convenient. 

The C language macros WhitePixel() and WhitePixelOfScreen() are equivalent and slightly more efficient. 

SEE ALSO

XBlackPixel∗(), XBlackPixelOfScreen(), XDefaultColormap∗(). 

Xlib Reference Manual