/// <inheritdoc/>
public void AddPaletteColors(Buffer2DRegion <TPixel> pixelRegion)
{
Rectangle bounds = pixelRegion.Rectangle;
Buffer2D <TPixel> source = pixelRegion.Buffer;
this.Build3DHistogram(source, bounds);
this.Get3DMoments(this.memoryAllocator);
this.BuildCube();
// Slice again since maxColors has been updated since the buffer was created.
Span <TPixel> paletteSpan = this.paletteOwner.GetSpan().Slice(0, this.maxColors);
ReadOnlySpan <Moment> momentsSpan = this.momentsOwner.GetSpan();
for (int k = 0; k < paletteSpan.Length; k++)
{
this.Mark(ref this.colorCube[k], (byte)k);
Moment moment = Volume(ref this.colorCube[k], momentsSpan);
if (moment.Weight > 0)
{
ref TPixel color = ref paletteSpan[k];
color.FromScaledVector4(moment.Normalize());
}
}
/// <inheritdoc/>
protected override ReadOnlyMemory <TPixel> GetPalette()
{
if (this.palette is null)
{
this.palette = new TPixel[this.colors];
ReadOnlySpan <Moment> momentsSpan = this.moments.GetSpan();
for (int k = 0; k < this.colors; k++)
{
this.Mark(ref this.colorCube[k], (byte)k);
Moment moment = Volume(ref this.colorCube[k], momentsSpan);
if (moment.Weight > 0)
{
ref TPixel color = ref this.palette[k];
color.FromScaledVector4(moment.Normalize());
}
}
}
/// <inheritdoc/>
public void BuildPalette(ImageFrame <TPixel> source, Rectangle bounds)
{
this.Build3DHistogram(source, bounds);
this.Get3DMoments(this.memoryAllocator);
this.BuildCube();
ReadOnlySpan <Moment> momentsSpan = this.momentsOwner.GetSpan();
Span <TPixel> paletteSpan = this.paletteOwner.GetSpan();
for (int k = 0; k < this.maxColors; k++)
{
this.Mark(ref this.colorCube[k], (byte)k);
Moment moment = Volume(ref this.colorCube[k], momentsSpan);
if (moment.Weight > 0)
{
ref TPixel color = ref paletteSpan[k];
color.FromScaledVector4(moment.Normalize());
}
}
