/// <inheritdoc/>
protected override PipelineBuilder OnBrushRequested()
{
// Starts a new composition pipeline from the given effect
PipelineBuilder Start(IPipelineEffect effect)
{
switch (effect)
{
case BackdropEffect backdrop when backdrop.Source == AcrylicBackgroundSource.Backdrop:
return(PipelineBuilder.FromBackdropBrush());
case BackdropEffect backdrop when backdrop.Source == AcrylicBackgroundSource.HostBackdrop:
return(PipelineBuilder.FromHostBackdropBrush());
case SolidColorEffect color: return(PipelineBuilder.FromColor(color.Color));
case ImageEffect image: return(PipelineBuilder.FromImage(image.Uri, image.DPIMode, image.CacheMode));
case TileEffect tile: return(PipelineBuilder.FromTiles(tile.Uri, tile.DPIMode, tile.CacheMode));
case AcrylicEffect acrylic:
switch (acrylic.Source)
{
case AcrylicBackgroundSource.Backdrop: return(PipelineBuilder.FromBackdropAcrylic(acrylic.Tint, (float)acrylic.TintMix, (float)acrylic.BlurAmount, acrylic.TextureUri));
case AcrylicBackgroundSource.HostBackdrop: return(PipelineBuilder.FromHostBackdropAcrylic(acrylic.Tint, (float)acrylic.TintMix, acrylic.TextureUri));
default: throw new ArgumentOutOfRangeException(nameof(acrylic.Source), $"Invalid acrylic source: {acrylic.Source}");
}
default: throw new ArgumentException($"Invalid initial pipeline effect: {effect.GetType()}");
}
}
// Appends an effect to an existing composition pipeline
PipelineBuilder Append(IPipelineEffect effect, PipelineBuilder builder)
{
switch (effect)
{
case OpacityEffect opacity: return(builder.Opacity((float)opacity.Value));
case LuminanceEffect _: return(builder.Effect(source => new LuminanceToAlphaEffect {
Source = source
}));
case TintEffect tint: return(builder.Tint(tint.Color, (float)tint.Opacity));
case BlurEffect blur: return(builder.Blur((float)blur.Value));
case SaturationEffect saturation: return(builder.Saturation((float)saturation.Value));
case BlendEffect blend: return(builder.Blend(Build(blend.Input), blend.Mode, blend.Placement));
default: throw new ArgumentException($"Invalid pipeline effect: {effect.GetType()}");
}
}
// Builds a new effects pipeline from the input effects sequence
PipelineBuilder Build(IList <IPipelineEffect> effects)
{
if (effects.Count == 0)
{
throw new ArgumentException("An effects pipeline can't be empty");
}
return(effects.Skip(1).Aggregate(Start(effects[0]), (b, e) => Append(e, b)));
}
return(Build(Effects));
}