XdbeSwapBuffers
Section: X FUNCTIONS (3)
Updated: libXext 1.3.4
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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().