Rgba32Extensions.cs

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using SixLabors.ImageSharp.PixelFormats;
 
namespace Engine.Media {
    public static class Rgba32Extensions {
        public static Rgba32 PremultiplyAlpha(this Rgba32 pixel) => new(
            (byte)(pixel.R * (uint)pixel.A / 255u),
            (byte)(pixel.G * (uint)pixel.A / 255u),
            (byte)(pixel.B * (uint)pixel.A / 255u),
            pixel.A
        );
 
        public static bool IsMagenta(this Rgba32 pixel) => pixel.R == 255 && pixel.G == 0 && pixel.B == 255 && pixel.A == 255;
 
        public static bool IsCompletelyTransparent(this Rgba32 pixel) => pixel.R == 0 && pixel.G == 0 && pixel.B == 0 && pixel.A == 0;
    }
}