/// <summary>
/// Handles the DisplayContentsInvalidated event
/// </summary>
/// <param name="sender">DisplayInformation</param>
/// <param name="args">Event arguments</param>
private void OnDisplayContentsInvalidated(DisplayInformation sender, object args)
{
//
// This will trigger the device lost event
//
_canvasDevice.RaiseDeviceLost();
}
void CoreApplication_Suspending(object sender, SuspendingEventArgs args)
{
try
{
device.Trim();
}
catch (Exception e) when(device.IsDeviceLost(e.HResult))
{
device.RaiseDeviceLost();
}
}
public async Task <CanvasImageSource> RenderToImageSourceAsync(
RenderTargetBitmap backgroundBitmap,
IReadOnlyList <InkStroke> inkStrokes, IReadOnlyList <InkStroke> highlightStrokes, double width, double height)
{
var dpi = DisplayInformation.GetForCurrentView().LogicalDpi;
var imageSource = new CanvasImageSource(_canvasDevice, (float)width, (float)height, dpi);
using (var drawingSession = imageSource.CreateDrawingSession(Colors.White))
{
try
{
var pixels = await backgroundBitmap.GetPixelsAsync();
var bitmap = SoftwareBitmap.CreateCopyFromBuffer(pixels, BitmapPixelFormat.Bgra8,
backgroundBitmap.PixelWidth, backgroundBitmap.PixelHeight);
var convertedImage = SoftwareBitmap.Convert(
bitmap,
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Premultiplied
);
var background = CanvasBitmap.CreateFromSoftwareBitmap(_canvasDevice, convertedImage);
drawingSession.DrawImage(background, new Rect(0, 0,
width,
height));
drawingSession.DrawInk(inkStrokes);
return(imageSource);
}
catch (Exception e) when(_canvasDevice.IsDeviceLost(e.HResult))
{
_canvasDevice.RaiseDeviceLost();
}
return(null);
}
}
private void ResetDevices(bool IsDeviceLost)
{
try
{
if (IsDeviceLost)
{
_canvasDevice.DeviceLost -= _canvasDevice_DeviceLost;
_canvasDevice = CanvasDevice.GetSharedDevice();
_canvasDevice.DeviceLost += _canvasDevice_DeviceLost;
}
CanvasComposition.SetCanvasDevice(_graphicsDevice, _canvasDevice);
}
catch (Exception e) when(_canvasDevice != null && _canvasDevice.IsDeviceLost(e.HResult))
{
_canvasDevice.RaiseDeviceLost();
}
}
public async Task <SoftwareBitmap> RenderAsync(IEnumerable <InkStroke> inkStrokes, double width, double height)
{
var dpi = DisplayInformation.GetForCurrentView().LogicalDpi;
try
{
var renderTarget = new CanvasRenderTarget(_canvasDevice, (float)width, (float)height, dpi);
using (renderTarget)
{
using (var drawingSession = renderTarget.CreateDrawingSession())
{
drawingSession.DrawInk(inkStrokes);
}
return(await SoftwareBitmap.CreateCopyFromSurfaceAsync(renderTarget));
}
}
catch (Exception e) when(_canvasDevice.IsDeviceLost(e.HResult))
{
_canvasDevice.RaiseDeviceLost();
}
return(null);
}
private void DeviceRemoved(DeviceLostHelper sender, object args)
{
_canvasDevice.RaiseDeviceLost();
}
private void _deviceLostHelper_DeviceLost(object sender, DeviceLostEventArgs e)
{
_canvasDevice.RaiseDeviceLost();
}