XdbeBeginIdiom - marks the beginning of a DBE idiom sequence.
#include <X11/extensions/Xdbe.h>
Status XdbeBeginIdiom(
   Display *dpy)
This function marks the beginning of an idiom sequence.
DBE, XdbeAllocateBackBufferName(), XdbeDeallocateBackBufferName(),
  XdbeEndIdiom(), XdbeFreeVisualInfo(),
  XdbeGetBackBufferAttributes(), XdbeGetVisualInfo(),
  XdbeQueryExtension(), XdbeSwapBuffers().