private void SamplePage_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// Get backing visual from shadow container and interop compositor
_shadowContainer = ElementCompositionPreview.GetElementVisual(ShadowContainer);
_compositor = _shadowContainer.Compositor;
// Get CompositionImage, its sprite visual
_image = VisualTreeHelperExtensions.GetFirstDescendantOfType <CompositionImage>(ShadowContainer);
_imageVisual = _image.SpriteVisual;
// Load mask asset onto surface using helpers in SamplesCommon
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_imageMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
// Create surface brush for mask
CompositionSurfaceBrush mask = _compositor.CreateSurfaceBrush();
mask.Surface = _imageMaskSurface.Surface;
// Get surface brush from composition image
CompositionSurfaceBrush source = _image.SurfaceBrush as CompositionSurfaceBrush;
// Create mask brush for toggle mask functionality
_maskBrush = _compositor.CreateMaskBrush();
_maskBrush.Mask = mask;
_maskBrush.Source = source;
// Initialize toggle mask
_isMaskEnabled = false;
}
private void SamplePage_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// Get backing visual from shadow container and interop compositor
_shadowContainer = ElementCompositionPreview.GetElementVisual(ShadowContainer);
_compositor = _shadowContainer.Compositor;
// Get CompositionImage, its sprite visual
_image = VisualTreeHelperExtensions.GetFirstDescendantOfType<CompositionImage>(ShadowContainer);
_imageVisual = _image.SpriteVisual;
// Load mask asset onto surface using helpers in SamplesCommon
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_imageMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
// Create surface brush for mask
CompositionSurfaceBrush mask = _compositor.CreateSurfaceBrush();
mask.Surface = _imageMaskSurface.Surface;
// Get surface brush from composition image
CompositionSurfaceBrush source = _image.SurfaceBrush as CompositionSurfaceBrush;
// Create mask brush for toggle mask functionality
_maskBrush = _compositor.CreateMaskBrush();
_maskBrush.Mask = mask;
_maskBrush.Source = source;
// Initialize toggle mask
_isMaskEnabled = false;
}
/// <summary>
/// Creates the circle used in the circle brush if not already created.
/// </summary>
private void EnsureCircleBrush()
{
if (_circleBrush == null)
{
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_circleSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
_circleBrush = _compositor.CreateSurfaceBrush(_circleSurface.Surface);
}
}
public ColorBloomTransitionHelper(UIElement hostForVisual)
{
this.hostForVisual = hostForVisual;
var visual = ElementCompositionPreview.GetElementVisual(hostForVisual);
_compositor = visual.Compositor;
_containerForVisuals = _compositor.CreateContainerVisual();
ElementCompositionPreview.SetElementChildVisual(hostForVisual, _containerForVisuals);
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_circleMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
}
/// <summary>
/// Creates an instance of the ColorBloomTransitionHelper.
/// Any visuals to be later created and animated will be hosted within the specified UIElement.
/// </summary>
public ColorBloomTransitionHelper(UIElement hostForVisual)
{
this.hostForVisual = hostForVisual;
// we have an element in the XAML tree that will host our Visuals
var visual = ElementCompositionPreview.GetElementVisual(hostForVisual);
_compositor = visual.Compositor;
// create a container
// adding children to this container adds them to the live visual tree
_containerForVisuals = _compositor.CreateContainerVisual();
ElementCompositionPreview.SetElementChildVisual(hostForVisual, _containerForVisuals);
// initialize the ImageLoader and create the circle mask
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_circleMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
}
/// <summary>
/// Creates an instance of the ColorBloomTransitionHelper.
/// Any visuals to be later created and animated will be hosted within the specified UIElement.
/// </summary>
public ColorBloomTransitionHelper(UIElement hostForVisual)
{
this.hostForVisual = hostForVisual;
// we have an element in the XAML tree that will host our Visuals
var visual = ElementCompositionPreview.GetElementVisual(hostForVisual);
_compositor = visual.Compositor;
// create a container
// adding children to this container adds them to the live visual tree
_containerForVisuals = _compositor.CreateContainerVisual();
ElementCompositionPreview.SetElementChildVisual(hostForVisual, _containerForVisuals);
// initialize the ImageLoader and create the circle mask
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_circleMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
}
/// <summary>
/// Updates the effects applied and visuals shown based on information retrieved from
/// calling the capabilities API
/// </summary>
private void UpdateAlbumArt()
{
if (_capabilities.AreEffectsSupported())
{
//
// If effects are supported, add effects to the background image and
// add a masked circle image in the center for better visual appearance.
//
if (!_containsCircleImage)
{
// Create circle mask
var circleMaskSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
// Create image visual to use as the circle-masked center image
_circleImageVisual = _compositor.CreateSpriteVisual();
_circleImageVisual.Size = new Vector2((float)ImageCanvas.ActualWidth / 2, (float)ImageCanvas.ActualHeight / 2);
var xOffset = (float)(ImageCanvas.ActualWidth / 2 - _circleImageVisual.Size.X / 2);
var yOffset = (float)(ImageCanvas.ActualHeight / 2 - _circleImageVisual.Size.Y / 2);
_circleImageVisual.Offset = new Vector3(xOffset, yOffset, 0);
// Create circle image surface
CompositionSurfaceBrush circleSurfaceBrush = _compositor.CreateSurfaceBrush();
circleSurfaceBrush.Surface = circleMaskSurface.Surface;
circleSurfaceBrush.Stretch = CompositionStretch.Uniform;
// Apply mask to visual
CompositionMaskBrush maskBrush = _compositor.CreateMaskBrush();
maskBrush.Source = _imageSurfaceBrush;
maskBrush.Mask = circleSurfaceBrush;
_circleImageVisual.Brush = maskBrush;
_imageContainer.Children.InsertAtTop(_circleImageVisual);
_containsCircleImage = true;
}
//
// Create saturation effect, which will be either used alone if effects are slow, or chained
// with blur if effects are fast
//
var saturationEffect = new SaturationEffect
{
Saturation = 0.3f,
Source = new CompositionEffectSourceParameter("SaturationSource")
};
if (_capabilities.AreEffectsFast())
{
// Create blur effect and chain with saturation effect
GaussianBlurEffect chainedEffect = new GaussianBlurEffect()
{
Name = "Blur",
Source = saturationEffect, //takes saturation effect as input
BlurAmount = 6.0f,
BorderMode = EffectBorderMode.Hard,
Optimization = EffectOptimization.Balanced
};
CompositionEffectFactory chainedEffectFactory = _compositor.CreateEffectFactory(chainedEffect);
CompositionEffectBrush effectBrush = chainedEffectFactory.CreateBrush();
effectBrush.SetSourceParameter("SaturationSource", _imageSurfaceBrush);
_backgroundImageVisual.Brush = effectBrush;
CapabilityText = "Effects are supported and fast. Background image is blurred and desaturated.";
}
else
{
// If effects are slow but supported use desaturation effect since it is less expensive than blur
CompositionEffectFactory saturationEffectFactory = _compositor.CreateEffectFactory(saturationEffect);
CompositionEffectBrush saturationBrush = saturationEffectFactory.CreateBrush();
saturationBrush.SetSourceParameter("SaturationSource", _imageSurfaceBrush);
_backgroundImageVisual.Brush = saturationBrush;
CapabilityText = "Effects are supported but not fast. Background image is desaturated.";
}
}
else
{
//
// If effects are not supported, just use the image as the background with no effects
// and remove the center circle image to declutter the UI.
//
if (_containsCircleImage)
{
_imageContainer.Children.Remove(_circleImageVisual);
_containsCircleImage = false;
}
_backgroundImageVisual.Brush = _imageSurfaceBrush;
CapabilityText = "Effects not supported. No effects are applied.";
}
}
/// <summary>
/// Creates the circle used in the circle brush if not already created.
/// </summary>
private void EnsureCircleBrush()
{
if (_circleBrush == null)
{
_imageLoader = ImageLoaderFactory.CreateImageLoader(_compositor);
_circleSurface = _imageLoader.CreateCircleSurface(200, Colors.White);
_circleBrush = _compositor.CreateSurfaceBrush(_circleSurface.Surface);
}
}
