VNC X-Server (Xvnc) without background pixmaps

Goal

VNC protocol is much more eficient with clear pixmaps than with fancy ones. I've tried to find a way to deny my users such pixmaps in Xvnc and found this solution:

How to:

Suppose you have the Xvnc source (this was done for version 3.3.2 R3), would be better to compile it first (just to be sure itīs ok).

• Edit the file .../Xvnc/programs/Xserver/dix/window.c
• goto function MakeRootTile(
• add the bzero call to clean the pixmap, in the last part of this function:
  

  ValidateGC((DrawablePtr)pWin->background.pixmap, pGC);
  
  from = (screenInfo.bitmapBitOrder == LSBFirst) ? _back_lsb : _back_msb;
  to = back;
  
  for (i = 4; i > 0; i--, from++)
  	for (j = len; j > 0; j--)
  	    *to++ = *from;
  
     bzero((char *)back,128);          /***** this line was added *****/
  
     (*pGC->ops->PutImage)((DrawablePtr)pWin->background.pixmap, pGC, 1,
  		    0, 0, 4, 4, 0, XYBitmap, (char *)back);
  
     FreeScratchGC(pGC);
  
  }
  

• Save
• Rebuild (and that's it)