Table of Contents
XdbeSwapBuffers - swaps front and back
DBE buffers.
#include <X11/extensions/Xdbe.h>
Status XdbeSwapBuffers(
Display *dpy,
XdbeSwapInfo *swap_info,
int num_windows)
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
- 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.
DBE, XdbeAllocateBackBufferName(),
XdbeBeginIdiom(), XdbeDeallocateBackBufferName(), XdbeEndIdiom(), XdbeFreeVisualInfo(),
XdbeGetBackBufferAttributes(), XdbeGetVisualInfo(), XdbeQueryExtension().
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