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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 Color[] colors;
private static Dictionary<string, SKBitmap> imagesCache = new Dictionary<string, SKBitmap>();
private FastBitmap(SKBitmap skBitmap, int verticalOffset = 0, int height = -1)
{
Width = skBitmap.Width;
Height = height <= 0 ? skBitmap.Height - verticalOffset : height;
if (skBitmap.Height - verticalOffset - Height < 0 || Height <= 0) throw new InvalidOperationException("Invalid image height.");
var pixels = skBitmap.Pixels;
colors = skBitmap.Pixels.Skip(verticalOffset * Width).Take(Width * Height).Select(p => Color.FromArgb(p.Alpha, p.Red, p.Green, p.Blue)).ToArray();
}
public static FastBitmap? Decode(string filename, int verticalOffset = 0, int height = -1)
{
try
{
using (var image = SKBitmap.Decode(filename))
{
if (image == null) return null;
imagesCache[filename] = image;
return new FastBitmap(image, verticalOffset, height);
}
}
finally
{
GC.Collect();
}
}
public Color GetPixelColor(int x, int y)
{
return colors[(y * Width) + x];
}
public void SetPixelColor(int x, int y, Color color)
{
colors[(y * 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 = colors[(y * Width) + x];
var skColor = new SKColor(color.R, color.G, color.B);
skImage.SetPixel(x, y, skColor);
}
}
return skImage.Encode(format, v).ToArray();
}
}
}
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