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using SkiaSharp;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using Color = System.Drawing.Color;
namespace com.clusterrr.Famicom.NesTiler
{
class Palette : IEquatable<Palette>, IEnumerable<SKColor>
{
private SKColor?[] colors = new SKColor?[3];
private Dictionary<ColorPair, (SKColor color, double delta)> deltaCache = new();
public SKColor? this[int i]
{
get
{
if (i < 1 || i > 3) throw new IndexOutOfRangeException("Color index must be between 1 and 3");
return colors[i - 1];
}
set
{
if (i < 1 || i > 3) throw new IndexOutOfRangeException("Color index must be between 1 and 3");
colors[i - 1] = value;
}
}
public int Count { get => colors.Where(c => c.HasValue).Count(); }
public Palette()
{
// Empty palette
}
public Palette(FastBitmap image, int leftX, int topY, int width, int height, SKColor bgColor)
{
Dictionary<SKColor, int> colorCounter = new();
for (int y = topY; y < topY + height; y++)
{
if (y < 0) continue;
for (int x = leftX; x < leftX + width; x++)
{
var color = image.GetPixelColor(x, y);
if (color == bgColor) continue;
if (!colorCounter.ContainsKey(color)) colorCounter[color] = 0;
colorCounter[color]++;
}
}
var sortedColors = colorCounter
.OrderByDescending(kv => kv.Value).ToArray();
for (int i = 0; i < 3; i++)
if (sortedColors.Length > i)
this[i + 1] = sortedColors[i].Key;
}
public void Add(SKColor color)
{
if (Count >= 3) throw new IndexOutOfRangeException();
this[Count + 1] = color;
deltaCache.Clear();
}
public Palette(IEnumerable<SKColor> colors)
{
var colorsList = colors.ToList();
for (int i = 0; i < 3; i++)
if (colorsList.Count > i) this[i + 1] = colorsList[i];
}
public double GetTileDelta(FastBitmap image, int leftX, int topY, int width, int height, SKColor bgColor)
{
double delta = 0;
for (int y = topY; y < topY + height; y++)
{
if (y < 0) continue;
for (int x = leftX; x < leftX + width; x++)
{
var color = image.GetPixelColor(x, y);
delta += GetMinDelta(color, bgColor).delta;
}
}
return delta;
}
private (SKColor color, double delta) GetMinDelta(SKColor color, SKColor bgColor)
{
var pair = new ColorPair()
{
Color1 = color,
Color2 = bgColor
};
if (deltaCache.ContainsKey(pair)) return deltaCache[pair];
var ac = Enumerable.Concat(colors.Where(c => c.HasValue).Select(c => c!.Value), new SKColor[] { bgColor });
var result = ac.OrderBy(c => c.GetDelta(color)).First();
var r = (result, result.GetDelta(color));
deltaCache[pair] = r;
return r;
}
public bool Equals(Palette? other)
{
if (other == null) return false;
var colors1 = colors.Where(c => c.HasValue)
.OrderBy(c => c!.Value.ToArgb())
.Select(c => c!.Value)
.ToArray();
var colors2 = new SKColor?[] { other[1], other[2], other[3] }
.Where(c => c.HasValue)
.OrderBy(c => c!.Value.ToArgb())
.Select(c => c!.Value)
.ToArray();
return Enumerable.SequenceEqual(colors1, colors2);
/*
if (other == null) return false;
var colors1 = colors.Where(c => c.HasValue)
.Select(c => c!.Value.ToArgb())
.OrderBy(c => c)
.ToArray();
var colors2 = new SKColor?[] { other[1], other[2], other[3] }
.Where(c => c.HasValue)
.Select(c => c!.Value.ToArgb())
.OrderBy(c => c)
.ToArray();
var r = Enumerable.SequenceEqual(colors1, colors2);
return r;
*/
}
public bool Contains(Palette other)
{
var thisColors = colors.Where(c => c.HasValue);
var otherColors = new SKColor?[] { other[1], other[2], other[3] }.Where(c => c.HasValue).Select(c => c!.Value);
foreach (var color in otherColors)
{
if (!thisColors.Contains(color))
return false;
}
return true;
}
public IEnumerator<SKColor> GetEnumerator()
{
return colors.Where(c => c.HasValue).Select(c => c!.Value).GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public override string ToString() => string.Join(", ", colors.Where(c => c.HasValue).Select(c => ColorTranslator.ToHtml(c!.Value.ToColor())).OrderBy(c => c));
public override int GetHashCode() => (int)((this[1]?.ToArgb() ?? 0) + ((this[2]?.ToArgb() ?? 0) << 4) + ((this[3]?.ToArgb() ?? 0) << 8));
}
}
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