Initial commit

Infra/Int32Pixel.cs

@@ -0,0 +1,82 @@
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using SixLabors.ImageSharp.PixelFormats;
+
+namespace StitchATon2.Infra;
+
+[StructLayout(LayoutKind.Sequential)]
+public record struct Int32Pixel
+{
+    public static int Size
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => Unsafe.SizeOf<Int32Pixel>();
+    }
+
+    public static Int32Pixel Zero
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => new();
+    }
+    
+    public int R;
+    public int G;
+    public int B;
+
+    public Int32Pixel(int r, int g, int b)
+    {
+        R = r;
+        G = g;
+        B = b;
+    }
+
+    public void Accumulate(Int32Pixel pixel)
+    {
+        R += pixel.R;
+        G += pixel.G;
+        B += pixel.B;
+    }
+
+    public void Accumulate(Rgb24 pixel)
+    {
+        R += pixel.R;
+        G += pixel.G;
+        B += pixel.B;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Int32Pixel operator +(Int32Pixel a, Int32Pixel b)
+    {
+        return new Int32Pixel(a.R + b.R, a.G + b.G, a.B + b.B);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Int32Pixel operator +(Int32Pixel a, int b)
+    {
+        return new Int32Pixel(a.R + b, a.G + b, a.B + b);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Int32Pixel operator -(Int32Pixel a, Int32Pixel b)
+    {
+        return new Int32Pixel(a.R - b.R, a.G - b.G, a.B - b.B);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static Int32Pixel operator /(Int32Pixel a, int b)
+    {
+        return new Int32Pixel(a.R / b, a.G / b, a.B / b);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static explicit operator Int32Pixel(Rgb24 pixel)
+    {
+        return new  Int32Pixel(pixel.R, pixel.G, pixel.B);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static explicit operator Rgb24(Int32Pixel pixel)
+    {
+        return new  Rgb24((byte)pixel.R, (byte)pixel.G, (byte)pixel.B);
+    }
+}