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using SkiaSharp;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
namespace com.clusterrr.Famicom.NesTiler
{
public class FastBitmap
{
public int Width { get; }
public int Height { get; }
private readonly int verticalOffset;
private readonly SKColor[] pixels;
private static Dictionary<string, (SKColor[] pixels, int w, int h)> imagesCache = new();
private FastBitmap(SKColor[] pixels, int originalWidth, int originalHeight, int verticalOffset = 0, int height = -1)
{
Width = originalWidth;
Height = height <= 0 ? originalHeight - verticalOffset : height;
this.verticalOffset = verticalOffset;
this.pixels = pixels;
}
public static FastBitmap? Decode(string filename, int verticalOffset = 0, int height = -1)
{
if (imagesCache.TryGetValue(filename, out (SKColor[] pixels, int w, int h) cachedImage))
{
return new FastBitmap(cachedImage.pixels, cachedImage.w, cachedImage.h, verticalOffset, height);
}
try
{
using (var image = SKBitmap.Decode(filename))
{
if (image == null) return null;
var pixels = image.Pixels;
imagesCache[filename] = (pixels, image.Width, image.Height);
return new FastBitmap(pixels, image.Width, image.Height, verticalOffset, height);
}
}
finally
{
GC.Collect();
}
}
public SKColor GetPixelColor(int x, int y, SKColor? defaultColor = null)
{
var index = ((y + verticalOffset) * Width) + x;
if (index >= pixels.Length)
{
if (defaultColor.HasValue) return defaultColor.Value;
throw new IndexOutOfRangeException($"Pixel {x}x{y} is out of range");
}
return pixels[index];
}
public void SetPixelColor(int x, int y, SKColor color)
{
pixels[((y + verticalOffset) * Width) + x] = color;
}
public byte[] Encode(SKEncodedImageFormat format, int v)
{
using var skImage = new SKBitmap(Width, Height);
for (int y = 0; y < Height; y++)
{
for (int x = 0; x < Width; x++)
{
var color = GetPixelColor(x, y);
skImage.SetPixel(x, y, color);
}
}
return skImage.Encode(format, v).ToArray();
}
}
}
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