private void UpdateImageSource(Rect updateRectangle)
{
if (Window.Current.Visible)
{
var imageRectangle = new Rect(new Point(), _canvasImageSource.Size);
updateRectangle.Intersect(imageRectangle);
if (updateRectangle.IsEmpty)
{
updateRectangle = imageRectangle;
}
CanvasDrawingSession drawingSession = null;
try
{
drawingSession = _canvasImageSource.CreateDrawingSession(Colors.Transparent, updateRectangle);
}
catch
{
drawingSession = _canvasImageSource.CreateDrawingSession(Colors.Transparent, imageRectangle);
}
finally
{
if (drawingSession != null)
{
drawingSession.DrawImage(_accumulationRenderTarget); // Render target has the composed frame
drawingSession.Dispose();
}
}
}
}
public void DisposeSession()
{
if (_session != null)
{
_session.Dispose();
_session = null;
}
}
/// <summary>
/// Called before drawing has started.
/// </summary>
public void BeginDraw()
{
if (_size_changed)
{
CanvasDevice device = CanvasDevice.GetSharedDevice();
_bitmap = new CanvasRenderTarget(device, _size.Width, _size.Height, 96);
_size_changed = false;
}
if (_session != null)
{
_session.Dispose();
}
_session = _bitmap.CreateDrawingSession();
_session.Clear(Colors.Transparent);
}
void DrawToImageSource(CanvasDrawingSession canvasControlDrawingSession)
{
// XAML doesn't support nested image source drawing sessions, so we must close
// the main CanvasControl one before drawing to a different CanvasImageSource.
canvasControlDrawingSession.Dispose();
using (var ds = imageSource.CreateDrawingSession(Colors.Transparent))
{
DrawToOutput(mainDeviceResources, ds);
}
}
//CanvasDrawingSession ls;
public override void Invalidate(bool init = false)
{
if (init)
{
source.SetPixelBytes(b.PixelBuffer);
}
else
{
session.Dispose();
source.GetPixelBytes(b.PixelBuffer);
b.Invalidate();
}
session = source.CreateDrawingSession();
//session.Blend = Blend;
}
internal void dispose()
{
graphics.Dispose();
disposed = true;
}
/// <summary>
/// Called when drawing has completed.
/// </summary>
public void EndDraw()
{
_canvas2d.Invalidate();
_session.Dispose();
}
public void Dispose()
{
m_DSession.Dispose();
}
