XdbeSwapBuffers(3X11) X FUNCTIONS XdbeSwapBuffers(3X11)NAMEXdbeSwapBuffers - 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 num-
ber 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 unde-
fined. This may be the most efficient action since
it allows the implementation to discard the con-
tents of the buffer if it needs to.
XdbeBackground
The unobscured region of the new back buffer will
be tiled with the window background. The back-
ground 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
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XdbeSwapBuffers(3X11) X FUNCTIONS XdbeSwapBuffers(3X11)ERRORS
BadMatch
A non-double-buffered window was specififed or a
window was specified twice.
BadWindow
An invalid window was specified.
BadValue
An invalid swap action was specified.
SEE ALSO
DBE, XdbeAllocateBackBufferName(), XdbeBeginIdiom(), Xdbe-
DeallocateBackBufferName(), XdbeEndIdiom(), XdbeFreeVisu-
alInfo(), XdbeGetBackBufferAttributes(), XdbeGetVisual-
Info(), XdbeQueryExtension().
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