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();
}
}
}
