XdbeSwapBuffers(3)

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 con-
              tents of the old back buffer

ERRORS

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

       BadWindow
              An invalid window was specified.

       BadValue
              An invalid swap action was specified.

SEE ALSO

       DBE,  XdbeAllocateBackBufferName(),  XdbeBeginIdiom(),  XdbeDeallocate-
       BackBufferName(),  XdbeEndIdiom(),  XdbeFreeVisualInfo(),  XdbeGetBack-
       BufferAttributes(), XdbeGetVisualInfo(), XdbeQueryExtension().

X Version 11                     libXext 1.0.3              XdbeSwapBuffers(3)