private async Task LoadOutputVirtualBitmap()
{
if (OutputVirtualBitmap != null)
{
OutputVirtualBitmap.Dispose();
OutputVirtualBitmap = null;
}
//LoadedImageInfo = "";
OutputVirtualBitmap = await CanvasVirtualBitmap.LoadAsync(OutputImageCanvas.Device, OutputImageStream, CanvasVirtualBitmapOptions.None);
if (OutputImageCanvas == null)
{
// This can happen if the page is unloaded while LoadAsync is running
return;
}
ImageResolution.Text = InputVirtualBitmap.Bounds.Width + " x " + InputVirtualBitmap.Bounds.Height + " | " + OutputVirtualBitmap.Bounds.Width + " x " + OutputVirtualBitmap.Bounds.Height;
var size = OutputVirtualBitmap.Size;
OutputImageCanvas.Width = size.Width * (Zoom + 1);
OutputImageCanvas.Height = size.Height * (Zoom + 1);
OutputImageCanvas.Invalidate();
//LoadedImageInfo = string.Format("{0}x{1} image, is {2}CachedOnDemand", size.Width, size.Height, virtualBitmap.IsCachedOnDemand ? "" : "not ");
}
private void Page_Unloaded(object sender, RoutedEventArgs e)
{
InputImageCanvas.RemoveFromVisualTree();
OutputImageCanvas.RemoveFromVisualTree();
InputImageCanvas = null;
OutputImageCanvas = null;
}
private void Page_SizeChanged(object sender, SizeChangedEventArgs e)
{
InputImageCanvas.Invalidate();
OutputImageCanvas.Invalidate();
InputCanvasScrollViewer.MaxWidth = double.MaxValue;
InputCanvasScrollViewer.MaxHeight = double.MaxValue;
OutputCanvasScrollViewer.MaxWidth = double.MaxValue;
OutputCanvasScrollViewer.MaxHeight = double.MaxValue;
}
private void OutputImageCanvas_RegionsInvalidated(Microsoft.Graphics.Canvas.UI.Xaml.CanvasVirtualControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasRegionsInvalidatedEventArgs args)
{
foreach (var region in args.InvalidatedRegions)
{
using (var ds = OutputImageCanvas.CreateDrawingSession(region))
{
if (OutputVirtualBitmap != null)
{
ds.DrawImage(OutputVirtualBitmap,
new Rect(0, 0, OutputVirtualBitmap.Bounds.Width * Zoom, OutputVirtualBitmap.Bounds.Height * Zoom),
new Rect(0, 0, OutputVirtualBitmap.Bounds.Width, OutputVirtualBitmap.Bounds.Height),
1.0f,
CanvasImageInterpolation.NearestNeighbor);
}
}
}
}
private void OutputCanvasScrollViewer_ViewChanging(object sender, ScrollViewerViewChangingEventArgs e) => OutputImageCanvas.Invalidate();
