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Tk_GetColormap(3)	     Tk Library Procedures	     Tk_GetColormap(3)


       Tk_GetColormap, Tk_FreeColormap - allocate and free colormaps

       #include <tk.h>

       Tk_GetColormap(interp, tkwin, string)

       Tk_FreeColormap(display, colormap)

       Tcl_Interp *interp    (in)      Interpreter to use for error reporting.

       Tk_Window  tkwin	     (in)      Token for window in which colormap will
				       be used.

       char	  *string    (in)      Selects a colormap:  either new or  the
				       name  of	 a window with the same screen
				       and visual as tkwin.

       Display	  *display   (in)      Display for which  colormap  was	 allo‐

       Colormap	  colormap   (in)      Colormap	  to  free;   must  have  been
				       returned by a previous call to  Tk_Get‐
				       Colormap or Tk_GetVisual.

       These  procedures are used to manage colormaps.	Tk_GetColormap returns
       a colormap suitable for use in tkwin.  If its string  argument  is  new
       then  a	new colormap is created;  otherwise string must be the name of
       another window with the same screen and visual as tkwin, and  the  col‐
       ormap  from  that window is returned.  If string doesn't make sense, or
       if it refers to a window on a different screen from  tkwin  or  with  a
       different  visual  than	tkwin,	then  Tk_GetColormap  returns None and
       leaves an error message in interp->result.

       Tk_FreeColormap should be called when a colormap returned by Tk_GetCol‐
       ormap  is  no  longer  needed.  Tk maintains a reference count for each
       colormap returned by Tk_GetColormap, so there should eventually be  one
       call  to	 Tk_FreeColormap for each call to Tk_GetColormap.  When a col‐
       ormap's reference count becomes zero, Tk releases the X colormap.

       Tk_GetVisual and Tk_GetColormap work together, in that a	 new  colormap
       created	by  Tk_GetVisual may later be returned by Tk_GetColormap.  The
       reference counting mechanism for colormaps includes both procedures, so
       callers	of  Tk_GetVisual must also call Tk_FreeColormap to release the
       colormap.  If Tk_GetColormap is called with a string value of new  then
       the  resulting  colormap	 will never be returned by Tk_GetVisual;  how‐
       ever, it can be used in other windows by	 calling  Tk_GetColormap  with
       the original window's name as string.


Tk				      4.0		     Tk_GetColormap(3)

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