fix wrong Slice() usages

src/ImageSharp/PixelFormats/PixelOperations{TPixel}.Generated.cs

@@ -75,7 +75,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToArgb32Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToArgb32(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Argb32>(destBytes));
+            this.ToArgb32(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Argb32>(destBytes));
         }
 
         /// <summary>
@@ -143,7 +143,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToBgr24Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToBgr24(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Bgr24>(destBytes));
+            this.ToBgr24(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Bgr24>(destBytes));
         }
 
         /// <summary>
@@ -211,7 +211,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToBgra32Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToBgra32(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Bgra32>(destBytes));
+            this.ToBgra32(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Bgra32>(destBytes));
         }
 
         /// <summary>
@@ -279,7 +279,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToGray8Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToGray8(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Gray8>(destBytes));
+            this.ToGray8(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Gray8>(destBytes));
         }
 
         /// <summary>
@@ -347,7 +347,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToGray16Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToGray16(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Gray16>(destBytes));
+            this.ToGray16(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Gray16>(destBytes));
         }
 
         /// <summary>
@@ -415,7 +415,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToRgb24Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToRgb24(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Rgb24>(destBytes));
+            this.ToRgb24(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Rgb24>(destBytes));
         }
 
         /// <summary>
@@ -483,7 +483,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToRgba32Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToRgba32(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Rgba32>(destBytes));
+            this.ToRgba32(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Rgba32>(destBytes));
         }
 
         /// <summary>
@@ -551,7 +551,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToRgb48Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToRgb48(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Rgb48>(destBytes));
+            this.ToRgb48(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Rgb48>(destBytes));
         }
 
         /// <summary>
@@ -619,7 +619,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void ToRgba64Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.ToRgba64(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, Rgba64>(destBytes));
+            this.ToRgba64(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, Rgba64>(destBytes));
         }
     }
 }

src/ImageSharp/PixelFormats/PixelOperations{TPixel}.Generated.tt

@@ -86,7 +86,7 @@
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal void To<#=pixelType#>Bytes(ReadOnlySpan<TPixel> sourcePixels, Span<byte> destBytes, int count)
         {
-            this.To<#=pixelType#>(sourcePixels.Slice(count), MemoryMarshal.Cast<byte, <#=pixelType#>>(destBytes));
+            this.To<#=pixelType#>(sourcePixels.Slice(0, count), MemoryMarshal.Cast<byte, <#=pixelType#>>(destBytes));
         }
 <#
     }

src/ImageSharp/Processing/Processors/Quantization/FrameQuantizerBase{TPixel}.cs

@@ -63,7 +63,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Quantization
         public virtual QuantizedFrame<TPixel> QuantizeFrame(ImageFrame<TPixel> image)
         {
             Guard.NotNull(image, nameof(image));
-            
+
             // Get the size of the source image
             int height = image.Height;
             int width = image.Width;

tests/ImageSharp.Tests/TestUtilities/ReferenceCodecs/SystemDrawingBridge.cs

@@ -101,7 +101,7 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
                         byte* sourcePtr = sourcePtrBase + (data.Stride * y);
 
                         Buffer.MemoryCopy(sourcePtr, destPtr, destRowByteCount, sourceRowByteCount);
-                        PixelOperations<TPixel>.Instance.FromBgr24(workBuffer.GetSpan().Slice(w), row);
+                        PixelOperations<TPixel>.Instance.FromBgr24(workBuffer.GetSpan().Slice(0, w), row);
                     }
                 }
             }