// End a double buffer drawing operation.
internal void End(Graphics graphics)
{
try
{
IntPtr display = dpy.Lock();
if (handle != XDrawable.Zero)
{
if (usesXdbe)
{
Xlib.XdbeSwapInfo info = new Xlib.XdbeSwapInfo();
info.swap_window = widget.GetWidgetHandle();
info.swap_action = Xlib.XdbeSwapAction.Background;
Xlib.XdbeSwapBuffers(display, ref info, 1);
}
else
{
using (Graphics g = new Graphics(widget))
{
Xlib.XCopyArea
(display, handle,
widget.GetGCHandle(), g.gc, 0, 0,
(uint)width, (uint)height, 0, 0);
}
}
}
}
finally
{
dpy.Unlock();
}
}
/// <summary>
/// <para>Constructs a new <see cref="T:Xsharp.DoubleBuffer"/>
/// instance.</para>
/// </summary>
///
/// <param name="widget">
/// <para>The widget to attach the double buffer to.</para>
/// </param>
///
/// <exception cref="T:System.ArgumentNullException">
/// <para>Raised if <paramref name="widget"/> is <see langword="null"/>.
/// </para>
/// </exception>
public DoubleBuffer(InputOutputWidget widget)
: base(GetDisplay(widget), GetScreen(widget),
DrawableKind.DoubleBuffer)
{
this.widget = widget;
this.width = widget.width;
this.height = widget.height;
try
{
IntPtr display = dpy.Lock();
// Determine if the X server supports double buffering.
try
{
Xlib.Xint major, minor;
if (Xlib.XdbeQueryExtension
(display, out major, out minor)
!= XStatus.Zero)
{
usesXdbe = true;
}
else
{
usesXdbe = false;
}
}
catch (Exception)
{
// Xdbe functions are not present in "Xext".
usesXdbe = false;
}
// Create the back buffer or pixmap, as appropriate.
if (usesXdbe)
{
handle = Xlib.XdbeAllocateBackBufferName
(display, widget.GetWidgetHandle(),
Xlib.XdbeSwapAction.Background);
}
else
{
handle = (XDrawable)
Xlib.XCreatePixmap
(display, (XDrawable)
Xlib.XRootWindowOfScreen(screen.screen),
(uint)width, (uint)height,
(uint)Xlib.XDefaultDepthOfScreen
(screen.screen));
}
}
finally
{
dpy.Unlock();
}
}
/// <summary>
/// <para>Constructs a new <see cref="T:Xsharp.DoubleBuffer"/>
/// instance.</para>
/// </summary>
///
/// <param name="widget">
/// <para>The widget to attach the double buffer to.</para>
/// </param>
///
/// <exception cref="T:System.ArgumentNullException">
/// <para>Raised if <paramref name="widget"/> is <see langword="null"/>.
/// </para>
/// </exception>
public DoubleBuffer(InputOutputWidget widget)
: base(GetDisplay(widget), GetScreen(widget),
DrawableKind.DoubleBuffer)
{
this.widget = widget;
this.width = widget.width;
this.height = widget.height;
try
{
IntPtr display = dpy.Lock();
// Determine if the X server supports double buffering.
try
{
Xlib.Xint major, minor;
if(Xlib.XdbeQueryExtension
(display, out major, out minor)
!= XStatus.Zero)
{
usesXdbe = true;
}
else
{
usesXdbe = false;
}
}
catch(Exception)
{
// Xdbe functions are not present in "Xext".
usesXdbe = false;
}
// Create the back buffer or pixmap, as appropriate.
if(usesXdbe)
{
handle = Xlib.XdbeAllocateBackBufferName
(display, widget.GetWidgetHandle(),
Xlib.XdbeSwapAction.Background);
}
else
{
handle = (XDrawable)
Xlib.XCreatePixmap
(display, (XDrawable)
Xlib.XRootWindowOfScreen(screen.screen),
(uint)width, (uint)height,
(uint)Xlib.XDefaultDepthOfScreen
(screen.screen));
}
}
finally
{
dpy.Unlock();
}
}
