private LayerContext CreateFakeLayerContext(Layer backgroundLayer, IImageProvider backgroundImage, Layer layer)
{
var invariants = new LayerContext.Invariants(backgroundLayer, new MaybeTask<IImageProvider>(backgroundImage), new Size(0, 0));
var layerContext = new LayerContext(invariants, backgroundLayer, layer, 1);
layerContext.PreviousImage = layerContext.BackgroundImage;
return layerContext;
}
private LayerContext CreateFakeLayerContext(Layer layer)
{
var backgroundImage = new ColorImageSource(BackgroundLayerSize, Colors.AliceBlue);
var backgroundLayer = new Layer(LayerStyle.Normal(), backgroundImage, BackgroundLayerSize);
var invariants = new LayerContext.Invariants(backgroundLayer, new MaybeTask<IImageProvider>(backgroundImage), new Size(0, 0));
var layerContext = new LayerContext(invariants, backgroundLayer, layer, 1);
layerContext.PreviousImage = layerContext.BackgroundImage;
return layerContext;
}
private IImageProvider CreateTestEffect(LayerContext layerContext)
{
return new FilterEffect()
{
Filters = new IFilter[]
{
new ReframingFilter(new Rect(new Point(0,0), layerContext.BackgroundLayer.ImageSize), 0.0)
}
};
}
/// <summary>
/// Resolve a MaybeTask<IImageProvider> that represents the whole layer stack.
/// </summary>
/// <param name="backgroundImage">A MaybeTask<IImageProvider> resulting in the image to use for the background layer.</param>
/// <param name="backgroundImageSize">Optionally, the size of the background image. If omitted, the natural size of the source will be used, but the size will not available in the LayerLinkingContext for lazy resolvers.</param>
/// <param name="renderSizeHint">Optionally, the size of image that the layer stack will be rendered to. Note that this is just a hint, the resulting <see cref="IImageProvider" /> should also be rendered at this size by the user.</param>
/// <returns>An IImageProvider that represents the whole layer stack.</returns>
public MaybeTask <IImageProvider> ToImageProvider(MaybeTask <IImageProvider> backgroundImage, Size backgroundImageSize = default(Size), Size renderSizeHint = default(Size))
{
var backgroundLayer = GetActiveBackgroundLayer(backgroundImage, backgroundImageSize);
var layerContextInvariants = new LayerContext.Invariants(backgroundLayer, backgroundImage, renderSizeHint);
var layerContexts = new LayerContext[Count];
layerContexts[0] = new LayerContext(layerContextInvariants, null, backgroundLayer, 0);
backgroundImage = backgroundLayer.GetImageProvider(layerContexts[0]);
var currentImage = backgroundImage;
for (int layerIndex = 1; layerIndex < layerContexts.Length; ++layerIndex)
{
Debug.WriteLine("Resolving layer " + layerIndex);
var context = new LayerContext(layerContextInvariants, layerContexts[layerIndex - 1].CurrentLayer, this[layerIndex], layerIndex);
context.PreviousImage = currentImage;
currentImage = context.CurrentLayer.GetImageProvider(context);
Debug.Assert(!currentImage.IsEmpty, "Resolved imageprovider is null.");
// Bind the previous image as the source of the current one.
currentImage = LayerSource.Bind(currentImage, context.PreviousImage);
// If blending is used, wrap the current image in a BlendEffect and bind the source to it as well.
var blendedCurrentImage = LayerBlend.Apply(context, currentImage);
if (!blendedCurrentImage.IsEmpty)
{
blendedCurrentImage = LayerSource.Bind(blendedCurrentImage, context.PreviousImage);
currentImage = blendedCurrentImage;
}
layerContexts[layerIndex] = context;
}
Debug.WriteLine("Resolved final image provider.");
return(currentImage);
}
private Task<IImageProvider> CreateTestImageProviderAsync(LayerContext layerContext)
{
return Task.Factory.StartNew<IImageProvider>(() => (IImageProvider)new ColorImageSource(layerContext.BackgroundLayer.ImageSize, Colors.Red), TaskCreationOptions.LongRunning);
}
private IImageProvider CreateTestImageProvider(LayerContext layerContext)
{
return new ColorImageSource(layerContext.BackgroundLayer.ImageSize, Colors.Red);
}
private Task<IImageProvider> CreateTestEffectAsync(LayerContext layerContext)
{
return Task.Factory.StartNew<IImageProvider>(() => new FilterEffect() { Filters = new IFilter[] { new ReframingFilter(new Rect(new Point(0, 0), layerContext.BackgroundLayer.ImageSize), 0.0) } });
}
private IImageProvider CreateTestEffect(LayerContext layerContext)
{
return new ReframingEffect(new Rect(new Point(0,0), layerContext.BackgroundLayer.ImageSize), 0.0);
}
