fix CopyTo***Bytes()

src/ImageSharp/Colors/PackedPixel/BulkPixelOperations{TColor}.cs

@@ -105,7 +105,7 @@ namespace ImageSharp
             for (int i = 0; i < count; i++)
             {
                 ref TColor sp = ref Unsafe.Add(ref sourceRef, i);
-                sp.ToXyzBytes(dest, i * 3);
+                sp.ToXyzBytes(dest, destBytes.Start + (i * 3));
             }
         }
 
@@ -152,7 +152,7 @@ namespace ImageSharp
             for (int i = 0; i < count; i++)
             {
                 ref TColor sp = ref Unsafe.Add(ref sourceRef, i);
-                sp.ToXyzwBytes(dest, i * 4);
+                sp.ToXyzwBytes(dest, destBytes.Start + (i * 4));
             }
         }
 
@@ -196,7 +196,7 @@ namespace ImageSharp
             for (int i = 0; i < count; i++)
             {
                 ref TColor sp = ref Unsafe.Add(ref sourceRef, i);
-                sp.ToZyxBytes(dest, i * 3);
+                sp.ToZyxBytes(dest, destBytes.Start + (i * 3));
             }
         }
 
@@ -243,7 +243,7 @@ namespace ImageSharp
             for (int i = 0; i < count; i++)
             {
                 ref TColor sp = ref Unsafe.Add(ref sourceRef, i);
-                sp.ToZyxwBytes(dest, i * 4);
+                sp.ToZyxwBytes(dest, destBytes.Start + (i * 4));
             }
         }
     }

src/ImageSharp/Common/Memory/BufferSpan.cs

@@ -35,7 +35,7 @@ namespace ImageSharp
             fixed (byte* pDest = &destRef)
             {
 #if NETSTANDARD1_1
-                Unsafe.CopyBlock(pDest, pSrc, (uint) byteCount);
+                Unsafe.CopyBlock(pDest, pSrc, (uint)byteCount);
 #else
                 if (byteCount > 512)
                 {

tests/ImageSharp.Benchmarks/General/PixelIndexing.cs

@@ -46,6 +46,7 @@
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public Vector4 GetPointersSrcsUnsafeImpl(int x, int y)
             {
+                // This is the original solution in PixelAccessor:
                 return Unsafe.Read<Vector4>((byte*)this.pointer + (((y * this.width) + x) * Unsafe.SizeOf<Vector4>()));
             }