/// <inheritdoc />
public override void Blend(MemoryAllocator memoryManager, Span <TPixel> destination, Span <TPixel> background, Span <TPixel> source, Span <float> amount)
{
Guard.MustBeGreaterThanOrEqualTo(background.Length, destination.Length, nameof(background.Length));
Guard.MustBeGreaterThanOrEqualTo(source.Length, destination.Length, nameof(source.Length));
Guard.MustBeGreaterThanOrEqualTo(amount.Length, destination.Length, nameof(amount.Length));
using (IMemoryOwner <Vector4> buffer = memoryManager.Allocate <Vector4>(destination.Length * 3))
{
Span <Vector4> destinationSpan = buffer.Slice(0, destination.Length);
Span <Vector4> backgroundSpan = buffer.Slice(destination.Length, destination.Length);
Span <Vector4> sourceSpan = buffer.Slice(destination.Length * 2, destination.Length);
PixelOperations <TPixel> .Instance.ToVector4(background, backgroundSpan, destination.Length);
PixelOperations <TPixel> .Instance.ToVector4(source, sourceSpan, destination.Length);
for (int i = 0; i < destination.Length; i++)
{
destinationSpan[i] = PorterDuffFunctions.Darken(backgroundSpan[i], sourceSpan[i], amount[i]);
}
PixelOperations <TPixel> .Instance.PackFromVector4(destinationSpan, destination, destination.Length);
}
}
/// <inheritdoc />
public override TPixel Blend(TPixel background, TPixel source, float amount)
{
return(PorterDuffFunctions.Darken(background, source, amount));
}