private async void OnLoaded(object sender, RoutedEventArgs e)
{
_compositor = Window.Current.Compositor;
_generator = _compositor.CreateCompositionGenerator();
var size = new Vector2(GridWidth, GridHeight);
_topOffset = -GridHeight / 2f;
// Create the left image visual
var leftImageVisual = _compositor.CreateSpriteVisual();
leftImageVisual.Size = size;
// Left Image Surface
var leftImageSurface = await _generator.CreateImageSurfaceAsync(new Uri("ms-appx:///Assets/Images/Image1.jpg"), size.ToSize(), ImageSurfaceOptions.Default);
// Left Mask Geometry
_leftGeometry = CanvasGeometry.CreateRectangle(_generator.Device, new Rect(0f, 0f, 2f * (GridWidth * _splitValue) / 100f, 2f * GridHeight));
var leftOffset = -(GridWidth * _splitValue) / 100f;
// Left Masked Brush
var leftMaskedBrush = _compositor.CreateMaskBrush();
leftMaskedBrush.Source = _compositor.CreateSurfaceBrush(leftImageSurface);
_leftGaussianSurface = _generator.CreateGaussianMaskSurface(size.ToSize(), _leftGeometry, new Vector2(leftOffset, _topOffset), _blurRadius);
leftMaskedBrush.Mask = _compositor.CreateSurfaceBrush(_leftGaussianSurface);
leftImageVisual.Brush = leftMaskedBrush;
// Create the right image visual
var rightImageVisual = _compositor.CreateSpriteVisual();
rightImageVisual.Size = size;
// Right Image Surface
var rightImageSurface = await _generator.CreateImageSurfaceAsync(new Uri("ms-appx:///Assets/Images/Image2.jpg"), size.ToSize(), ImageSurfaceOptions.Default);
// Right Mask Geometry
_rightGeometry = CanvasGeometry.CreateRectangle(_generator.Device, new Rect(0, 0, 2f * (GridWidth * (100f - _splitValue)) / 100, 2f * GridHeight));
// Right Masked Brush
var rightMaskedBrush = _compositor.CreateMaskBrush();
rightMaskedBrush.Source = _compositor.CreateSurfaceBrush(rightImageSurface);
_rightGaussianSurface = _generator.CreateGaussianMaskSurface(size.ToSize(), _rightGeometry, new Vector2(-leftOffset, _topOffset), _blurRadius);
rightMaskedBrush.Mask = _compositor.CreateSurfaceBrush(_rightGaussianSurface);
rightImageVisual.Brush = rightMaskedBrush;
var visualContainer = _compositor.CreateContainerVisual();
visualContainer.Size = size;
visualContainer.Children.InsertAtTop(leftImageVisual);
visualContainer.Children.InsertAtTop(rightImageVisual);
ElementCompositionPreview.SetElementChildVisual(ImageGrid, visualContainer);
}
private async void OnPageLoaded(object sender, RoutedEventArgs e)
{
_compositor = Window.Current.Compositor;
_generator = _compositor.CreateCompositionGenerator();
var size = new Vector2(GridWidth, GridWidth);
// Create the image visual
var imageVisual = _compositor.CreateSpriteVisual();
imageVisual.Size = size;
var imageSurface = await _generator.CreateImageSurfaceAsync(new Uri("ms-appx:///Assets/Images/cat.png"),
size.ToSize(), ImageSurfaceOptions.Default);
imageVisual.Brush = _compositor.CreateSurfaceBrush(imageSurface);
ElementCompositionPreview.SetElementChildVisual(ImageGrid, imageVisual);
//Create the mask visual
var maskVisual = _compositor.CreateSpriteVisual();
maskVisual.Size = size;
// Create the combined geometry
var ellipse1 = CanvasGeometry.CreateEllipse(_generator.Device, GridWidth / 2, GridWidth / 2, GridWidth * 0.375f, GridWidth * 0.1875f);
var ellipse2 = CanvasGeometry.CreateEllipse(_generator.Device, GridWidth / 2, GridWidth / 2, GridWidth * 0.1875f, GridWidth * 0.375f);
_combinedGeometry = ellipse1.CombineWith(ellipse2, Matrix3x2.Identity, CanvasGeometryCombine.Union);
// Create SurfaceBrush from MaskSurface
ElementCompositionPreview.SetElementChildVisual(MaskGrid, maskVisual);
var outputVisual = _compositor.CreateSpriteVisual();
outputVisual.Size = size;
var maskedBrush = _compositor.CreateMaskBrush();
maskedBrush.Source = imageVisual.Brush;
_gaussianSurface = _generator.CreateGaussianMaskSurface(size.ToSize(), _combinedGeometry, Vector2.Zero, 0);
maskedBrush.Mask = _compositor.CreateSurfaceBrush(_gaussianSurface);
maskVisual.Brush = _compositor.CreateSurfaceBrush(_gaussianSurface);;
outputVisual.Brush = maskedBrush;
ElementCompositionPreview.SetElementChildVisual(OutputGrid, outputVisual);
}
/// <summary>
/// Creates a custom shaped Effect Brush using BackdropBrush and an IGaussianMaskSurface
/// </summary>
/// <param name="compositor">Compositor</param>
/// <param name="mask">IMaskSurface</param>
/// <param name="blendColor">Color to blend in the BackdropBrush</param>
/// <param name="blurRadius">Blur Amount of the Backdrop Brush</param>
/// <param name="backdropBrush">Backdrop Brush (optional). If not provided, then compositor creates it.</param>
/// <returns>CompositionEffectBrush</returns>
public static CompositionEffectBrush CreateGaussianMaskedBackdropBrush(this Compositor compositor, IGaussianMaskSurface mask,
Color blendColor, float blurRadius, CompositionBackdropBrush backdropBrush = null)
{
return(CompositionExtensions.CreateBackdropBrush(compositor, mask, blendColor, blurRadius, backdropBrush));
}
