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Full Discussion: graphics commands ? ? ?
Top Forums Programming graphics commands ? ? ? Post 24539 by immanuelgangte on Sunday 14th of July 2002 10:42:32 AM
Old 07-14-2002
thanks hell 666 .
 

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Tk_GetGC(3)						       Tk Library Procedures						       Tk_GetGC(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_GetGC, Tk_FreeGC - maintain database of read-only graphics contexts SYNOPSIS
#include <tk.h> GC Tk_GetGC(tkwin, valueMask, valuePtr) Tk_FreeGC(display, gc) ARGUMENTS
Tk_Window tkwin (in) Token for window in which the graphics context will be used. unsigned long valueMask (in) Mask of bits (such as GCForeground or GCStipple) indicating which fields of *valuePtr are valid. XGCValues *valuePtr (in) Pointer to structure describing the desired values for the graphics context. Display *display (in) Display for which gc was allocated. GC gc (in) X identifier for graphics context that is no longer needed. Must have been allocated by Tk_GetGC. _________________________________________________________________ DESCRIPTION
Tk_GetGC and Tk_FreeGC manage a collection of graphics contexts being used by an application. The procedures allow graphics contexts to be shared, thereby avoiding the server overhead that would be incurred if a separate GC were created for each use. Tk_GetGC takes arguments describing the desired graphics context and returns an X identifier for a GC that fits the description. The graphics context that is returned will have default values in all of the fields not specified explicitly by valueMask and valuePtr. Tk_GetGC maintains a database of all the graphics contexts it has created. Whenever possible, a call to Tk_GetGC will return an existing graphics context rather than creating a new one. This approach can substantially reduce server overhead, so Tk_GetGC should generally be used in preference to the Xlib procedure XCreateGC, which creates a new graphics context on each call. Since the return values of Tk_GetGC are shared, callers should never modify the graphics contexts returned by Tk_GetGC. If a graphics con- text must be modified dynamically, then it should be created by calling XCreateGC instead of Tk_GetGC. When a graphics context is no longer needed, Tk_FreeGC should be called to release it. There should be exactly one call to Tk_FreeGC for each call to Tk_GetGC. When a graphics context is no longer in use anywhere (i.e. it has been freed as many times as it has been gotten) Tk_FreeGC will release it to the X server and delete it from the database. KEYWORDS
graphics context Tk Tk_GetGC(3)

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