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using SkiaSharp;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using Color = System.Drawing.Color;
namespace com.clusterrr.Famicom.NesTiler
{
class Palette : IEquatable<Palette>, IEnumerable<SKColor>
{
public struct LossyInfo
{
public int ImageNum { get; init; }
public int TileX { get; init; }
public int TileY { get; init; }
public int TileWidth { get; init; }
public int TileHeight { get; init; }
public SKColor[] Colors { get; init; }
}
private SKColor[] colors;
private Dictionary<ColorPair, (SKColor color, double delta)> deltaCache = new();
public LossyInfo? ColorLossy { get; init; } = null;
public SKColor? this[int i]
{
get
{
if (i > colors.Length) return null;
if (i <= 0) throw new ArgumentOutOfRangeException("Invalid color index");
return colors[i - 1];
}
}
public int Count => colors.Length;
public Palette(int imageNum, FastBitmap image, int tileX, int tileY, int tileWidth, int tileHeight, SKColor bgColor)
{
Dictionary<SKColor, int> colorCounter = new();
for (int y = tileY; y < tileY + tileHeight; y++)
{
if (y < 0) continue;
for (int x = tileX; x < tileX + tileWidth; x++)
{
var color = image.GetPixelColor(x, y);
if (color == bgColor) continue;
if (!colorCounter.ContainsKey(color)) colorCounter[color] = 0;
colorCounter[color]++;
}
}
var colorsCandidates = colorCounter.OrderByDescending(kv => kv.Value);
if (colorsCandidates.Count() > 3) ColorLossy = new()
{
ImageNum = imageNum,
TileX = tileX,
TileY = tileY,
TileWidth = tileWidth,
TileHeight = tileHeight,
Colors = Enumerable.Concat(new[] { bgColor }, colorsCandidates.Select(kv => kv.Key)).ToArray()
};
colors = colorsCandidates.Take(3).OrderBy(kv => kv.Key.ToArgb()).Select(kv => kv.Key).ToArray();
}
public Palette(IEnumerable<SKColor> colors, bool nosort = false)
{
if (!nosort)
this.colors = colors.OrderBy(c => c.ToArgb()).Take(3).ToArray();
else
this.colors = colors.Take(3).ToArray();
}
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, new[] { 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 r = Enumerable.SequenceEqual(this, other);
return r;
}
public bool Contains(Palette other)
{
foreach (var color in other)
{
if (!this.Contains(color))
return false;
}
return true;
}
public IEnumerator<SKColor> GetEnumerator()
{
return colors.Select(c => c).GetEnumerator(); // wtf?
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public override string ToString() => string.Join(", ", colors.Select(c => ColorTranslator.ToHtml(c.ToColor())));
public override int GetHashCode() => (int)((this[1]?.ToArgb() ?? 0) + ((this[2]?.ToArgb() ?? 0) << 4) + ((this[3]?.ToArgb() ?? 0) << 8));
}
}
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