private async Task LoadInputVirtualBitmap()
{
ContentFrame_Reset();
ContentFrameCollapse();
if (InputVirtualBitmap != null)
{
InputVirtualBitmap.Dispose();
InputVirtualBitmap = null;
}
//LoadedImageInfo = "";
InputVirtualBitmap = await CanvasVirtualBitmap.LoadAsync(InputImageCanvas.Device, InputImageStream, CanvasVirtualBitmapOptions.None);
if (InputImageCanvas == null)
{
// This can happen if the page is unloaded while LoadAsync is running
return;
}
var size = InputVirtualBitmap.Size;
InputImageCanvas.Width = size.Width * (Zoom + 1);
InputImageCanvas.Height = size.Height * (Zoom + 1);
InputImageCanvas.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 InputImageCanvas_RegionsInvalidated(Microsoft.Graphics.Canvas.UI.Xaml.CanvasVirtualControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasRegionsInvalidatedEventArgs args)
{
foreach (var region in args.InvalidatedRegions)
{
using (var ds = InputImageCanvas.CreateDrawingSession(region))
{
if (InputVirtualBitmap != null)
{
ds.DrawImage(InputVirtualBitmap,
new Rect(0, 0, InputVirtualBitmap.Bounds.Width * Zoom, InputVirtualBitmap.Bounds.Height * Zoom),
new Rect(0, 0, InputVirtualBitmap.Bounds.Width, InputVirtualBitmap.Bounds.Height),
1.0f,
CanvasImageInterpolation.NearestNeighbor);
}
}
}
}
private void InputCanvasScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
InputImageCanvas.Invalidate();
OutputCanvasScrollViewer.ChangeView(InputCanvasScrollViewer.HorizontalOffset, InputCanvasScrollViewer.VerticalOffset, null);
}
