private void GenPoints(Image <Rgba32> buffer)
            {
                var o      = PointSize - 1;
                var random = new Random(Seed);
                var span   = buffer.GetPixelSpan();

                for (var i = 0; i < PointCount; i++)
                {
                    var x = random.Next(0, buffer.Width);
                    var y = random.Next(0, buffer.Height);

                    var dist = random.NextFloat();

                    for (var oy = y - o; oy <= y + o; oy++)
                    {
                        for (var ox = x - o; ox <= x + o; ox++)
                        {
                            var ix = MathHelper.Mod(ox, buffer.Width);
                            var iy = MathHelper.Mod(oy, buffer.Height);

                            var color = Color.InterpolateBetween(FarColor, CloseColor, dist).ConvertImgSharp();
                            span[iy * buffer.Width + ix] = color;
                        }
                    }
                }
            }
            private void GenPointsMasked(Image <Rgba32> buffer)
            {
                var o      = PointSize - 1;
                var random = new Random(Seed);
                var noise  = new NoiseGenerator(MaskNoiseType);

                noise.SetSeed(MaskSeed);
                noise.SetFrequency(MaskFrequency);
                noise.SetPersistence(MaskPersistence);
                noise.SetLacunarity(MaskLacunarity);
                noise.SetOctaves(MaskOctaves);
                noise.SetPeriodX(buffer.Width);
                noise.SetPeriodY(buffer.Height);

                var threshVal = 1 / (1 - MaskThreshold);
                var powFactor = 1 / MaskPower;

                const int maxPointAttemptCount = 9999;
                var       pointAttemptCount    = 0;

                var span = buffer.GetPixelSpan();

                for (var i = 0; i < PointCount; i++)
                {
                    var x = random.Next(0, buffer.Width);
                    var y = random.Next(0, buffer.Height);

                    // Grab noise at this point.
                    var noiseVal = MathF.Min(1, MathF.Max(0, (noise.GetNoiseTiled(x, y) + 1) / 2));
                    // Threshold
                    noiseVal  = MathF.Max(0, noiseVal - MaskThreshold);
                    noiseVal *= threshVal;
                    noiseVal  = (float)MathF.Pow(noiseVal, powFactor);

                    var randomThresh = random.NextFloat();
                    if (randomThresh > noiseVal)
                    {
                        if (++pointAttemptCount <= maxPointAttemptCount)
                        {
                            i--;
                        }

                        continue;
                    }

                    var dist = random.NextFloat();

                    for (var oy = y - o; oy <= y + o; oy++)
                    {
                        for (var ox = x - o; ox <= x + o; ox++)
                        {
                            var ix = MathHelper.Mod(ox, buffer.Width);
                            var iy = MathHelper.Mod(oy, buffer.Height);

                            var color = Color.InterpolateBetween(FarColor, CloseColor, dist).ConvertImgSharp();
                            span[iy * buffer.Width + ix] = color;
                        }
                    }
                }
            }
            public override void Apply(Image <Rgba32> bitmap)
            {
                var noise = new NoiseGenerator(NoiseType);

                noise.SetSeed(Seed);
                noise.SetFrequency(Frequency);
                noise.SetPersistence(Persistence);
                noise.SetLacunarity(Lacunarity);
                noise.SetOctaves(Octaves);
                noise.SetPeriodX(bitmap.Width);
                noise.SetPeriodY(bitmap.Height);
                var threshVal = 1 / (1 - Threshold);
                var powFactor = 1 / Power;

                var span = bitmap.GetPixelSpan();

                for (var y = 0; y < bitmap.Height; y++)
                {
                    for (var x = 0; x < bitmap.Width; x++)
                    {
                        // Do noise calculations.
                        var noiseVal = MathF.Min(1, MathF.Max(0, (noise.GetNoiseTiled(x, y) + 1) / 2));

                        // Threshold
                        noiseVal  = MathF.Max(0, noiseVal - Threshold);
                        noiseVal *= threshVal;
                        noiseVal  = (float)MathF.Pow(noiseVal, powFactor);

                        // Get colors based on noise values.
                        var srcColor = Color.InterpolateBetween(OuterColor, InnerColor, noiseVal)
                                       .WithAlpha(noiseVal);

                        // Apply blending factors & write back.
                        var i        = y * bitmap.Width + x;
                        var dstColor = span[i].ConvertImgSharp();
                        span[i] = Color.Blend(dstColor, srcColor, DstFactor, SrcFactor).ConvertImgSharp();
                    }
                }
            }