public void RecoverAfterDeviceLost()
{
if (regionMask != null)
{
regionMask.Dispose();
}
if (currentRegionMask != null)
{
regionMask = new CanvasRenderTarget(SourceBitmap.Device, Parent.Size.X, Parent.Size.Y, 96);
regionMask.SetPixelBytes(currentRegionMask);
}
cachedRegionMask.RecoverAfterDeviceLost();
}
void canvas_CreateResources(CanvasControl sender, CanvasCreateResourcesEventArgs args)
{
switch (args.Reason)
{
case CanvasCreateResourcesReason.FirstTime:
// First time initialization: either restore suspended app state, load a
// photo that was passed in from the shell, or bring up the file selector.
if (launchArg is ApplicationExecutionState && (ApplicationExecutionState)launchArg == ApplicationExecutionState.Terminated)
{
var restoreTask = RestoreSuspendedState(sender.Device);
args.TrackAsyncAction(restoreTask.AsAsyncAction());
}
else
{
if (!TryLoadPhoto(launchArg as IReadOnlyList <IStorageItem>))
{
LoadButton_Click(null, null);
}
}
break;
case CanvasCreateResourcesReason.NewDevice:
// Recovering after a lost device (GPU reset).
if (photo.SourceBitmap != null)
{
photo.RecoverAfterDeviceLost(sender.Device);
}
cachedImage.RecoverAfterDeviceLost();
break;
case CanvasCreateResourcesReason.DpiChanged:
// We mostly work in pixels rather than DIPs, so only need
// minimal layout updates in response to DPI changes.
if (photo.SourceBitmap != null)
{
ZoomToFitPhoto();
}
break;
}
}
