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Voreen 1.5-snapshot3 (Default branch)

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Special Forums News, Links, Events and Announcements Software Releases - RSS News Voreen 1.5-snapshot3 (Default branch)
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Old 11-15-2008
Voreen 1.5-snapshot3 (Default branch)
Image Voreen is a computer graphics library for interactive volume visualization. It provides several visualization techniques for volumetric data and makes use of programmable graphics hardware (shaders) to accelerate rendering. The accompanying applications allow for creating and testing new rendering techniques. Voreen is implemented with C++ and uses OpenGL/GLSL for rendering. License: GNU General Public License v2 Changes:
This development release has a new modular volume raycaster with multiple shading and gradient calculation modes, multiplanar slice rendering, clipping widgets, and many more feature improvements and bugfixes. Image

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LEARN ABOUT CENTOS

tk_freegc

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)