bionic (3) XdbeSwapBuffers.3.gz

NAME

       XdbeSwapBuffers - swaps front and back DBE buffers.

SYNOPSIS

       #include <X11/extensions/Xdbe.h>

       Status XdbeSwapBuffers(
           Display      *dpy,
           XdbeSwapInfo *swap_info,
           int          num_windows)

DESCRIPTION

       This function swaps the front and back buffers for a list of windows.  The argument num_windows specifies
       how many windows are to have their buffers swapped; it is the number of elements in the swap_info  array.
       The argument swap_info specifies the information needed per window to do the swap.

       The XdbeSwapInfo structure has the following fields:

            Window            swap_window
            XdbeSwapAction    swap_action

       swap_window specifies the window for which to swap buffers.  swap_action specifies the swap action to use
       for this swap_window.

       swap_action determines what will happen to the new back buffer of the swap_window it is  paired  with  in
       the list in addition to making the old back buffer become visible.  The defined actions are as follows:

       XdbeUndefined
              The contents of the new back buffer become undefined.  This may be the most efficient action since
              it allows the implementation to discard the contents of the buffer if it needs to.

       XdbeBackground
              The unobscured region of the new back buffer will  be  tiled  with  the  window  background.   The
              background action allows devices to use a fast clear capability during a swap.

       XdbeUntouched
              The unobscured region of the new back buffer will be unmodified by the swap.

       XdbeCopied
              The unobscured region of the new back buffer will be the contents of the old back buffer

ERRORS

       BadMatch
              A non-double-buffered window was specified or a window was specified twice.

       BadWindow
              An invalid window was specified.

       BadValue
              An invalid swap action was specified.

SEE ALSO

       DBE,   XdbeAllocateBackBufferName(),  XdbeBeginIdiom(),  XdbeDeallocateBackBufferName(),  XdbeEndIdiom(),
       XdbeFreeVisualInfo(), XdbeGetBackBufferAttributes(), XdbeGetVisualInfo(), XdbeQueryExtension().