MirOS Manual: XdbeSwapBuffers(3)


XdbeSwapBuffers(3X11)      X FUNCTIONS      XdbeSwapBuffers(3X11)

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 win-
     dows 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

XFree86                   Version 4.5.0                         1

XdbeSwapBuffers(3X11)      X FUNCTIONS      XdbeSwapBuffers(3X11)

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(), XdbeFreeV-
     isualInfo(), XdbeGetBackBufferAttributes(), XdbeGet-
     VisualInfo(), XdbeQueryExtension().

XFree86                   Version 4.5.0                         2

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