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().