Refactoring and tweaks (2)

src/ImageSharp/Advanced/AdvancedImageExtensions.cs

@@ -60,7 +60,7 @@ private static Configuration GetConfiguration(IConfigurationProvider source)
         /// therefore it's not recommended to mutate the image while holding a reference to it's <see cref="IMemoryGroup{T}"/>.
         /// </remarks>
         public static IMemoryGroup<TPixel> GetPixelMemoryGroup<TPixel>(this ImageFrame<TPixel> source)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
             => source?.PixelBuffer.FastMemoryGroup.View ?? throw new ArgumentNullException(nameof(source));
 
         /// <summary>
@@ -75,7 +75,7 @@ public static IMemoryGroup<TPixel> GetPixelMemoryGroup<TPixel>(this ImageFrame<T
         /// therefore it's not recommended to mutate the image while holding a reference to it's <see cref="IMemoryGroup{T}"/>.
         /// </remarks>
         public static IMemoryGroup<TPixel> GetPixelMemoryGroup<TPixel>(this Image<TPixel> source)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
             => source?.Frames.RootFrame.GetPixelMemoryGroup() ?? throw new ArgumentNullException(nameof(source));
 
         /// <summary>
@@ -89,7 +89,7 @@ public static IMemoryGroup<TPixel> GetPixelMemoryGroup<TPixel>(this Image<TPixel
         [Obsolete(
             @"GetPixelSpan might fail, because the backing buffer could be discontiguous for large images. Use GetPixelMemoryGroup or GetPixelRowSpan instead!")]
         public static Span<TPixel> GetPixelSpan<TPixel>(this ImageFrame<TPixel> source)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
 
@@ -113,7 +113,7 @@ public static Span<TPixel> GetPixelSpan<TPixel>(this ImageFrame<TPixel> source)
         [Obsolete(
             @"GetPixelSpan might fail, because the backing buffer could be discontiguous for large images. Use GetPixelMemoryGroup or GetPixelRowSpan instead!")]
         public static Span<TPixel> GetPixelSpan<TPixel>(this Image<TPixel> source)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
 
@@ -129,7 +129,7 @@ public static Span<TPixel> GetPixelSpan<TPixel>(this Image<TPixel> source)
         /// <param name="rowIndex">The row.</param>
         /// <returns>The <see cref="Span{TPixel}"/></returns>
         public static Span<TPixel> GetPixelRowSpan<TPixel>(this ImageFrame<TPixel> source, int rowIndex)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
             Guard.MustBeGreaterThanOrEqualTo(rowIndex, 0, nameof(rowIndex));
@@ -147,7 +147,7 @@ public static Span<TPixel> GetPixelRowSpan<TPixel>(this ImageFrame<TPixel> sourc
         /// <param name="rowIndex">The row.</param>
         /// <returns>The <see cref="Span{TPixel}"/></returns>
         public static Span<TPixel> GetPixelRowSpan<TPixel>(this Image<TPixel> source, int rowIndex)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
             Guard.MustBeGreaterThanOrEqualTo(rowIndex, 0, nameof(rowIndex));
@@ -165,7 +165,7 @@ public static Span<TPixel> GetPixelRowSpan<TPixel>(this Image<TPixel> source, in
         /// <param name="rowIndex">The row.</param>
         /// <returns>The <see cref="Span{TPixel}"/></returns>
         public static Memory<TPixel> GetPixelRowMemory<TPixel>(this ImageFrame<TPixel> source, int rowIndex)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
             Guard.MustBeGreaterThanOrEqualTo(rowIndex, 0, nameof(rowIndex));
@@ -183,7 +183,7 @@ public static Memory<TPixel> GetPixelRowMemory<TPixel>(this ImageFrame<TPixel> s
         /// <param name="rowIndex">The row.</param>
         /// <returns>The <see cref="Span{TPixel}"/></returns>
         public static Memory<TPixel> GetPixelRowMemory<TPixel>(this Image<TPixel> source, int rowIndex)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(source, nameof(source));
             Guard.MustBeGreaterThanOrEqualTo(rowIndex, 0, nameof(rowIndex));

src/ImageSharp/Advanced/AotCompilerTools.cs

@@ -79,7 +79,7 @@ private static void SeedEverything()
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void Seed<TPixel>()
-             where TPixel : struct, IPixel<TPixel>
+             where TPixel : unmanaged, IPixel<TPixel>
         {
             // This is we actually call all the individual methods you need to seed.
             AotCompileOctreeQuantizer<TPixel>();
@@ -110,7 +110,7 @@ private static void Seed<TPixel>()
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCompileOctreeQuantizer<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             using (var test = new OctreeFrameQuantizer<TPixel>(Configuration.Default, new OctreeQuantizer().Options))
             {
@@ -124,7 +124,7 @@ private static void AotCompileOctreeQuantizer<TPixel>()
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCompileWuQuantizer<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             using (var test = new WuFrameQuantizer<TPixel>(Configuration.Default, new WuQuantizer().Options))
             {
@@ -138,7 +138,7 @@ private static void AotCompileWuQuantizer<TPixel>()
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCompilePaletteQuantizer<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             using (var test = (PaletteFrameQuantizer<TPixel>)new PaletteQuantizer(Array.Empty<Color>()).CreateFrameQuantizer<TPixel>(Configuration.Default))
             {
@@ -152,7 +152,7 @@ private static void AotCompilePaletteQuantizer<TPixel>()
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCompileDithering<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             ErrorDither errorDither = ErrorDither.FloydSteinberg;
             OrderedDither orderedDither = OrderedDither.Bayer2x2;
@@ -171,7 +171,7 @@ private static void AotCompileDithering<TPixel>()
         /// <param name="encoder">The image encoder to seed.</param>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCodec<TPixel>(IImageDecoder decoder, IImageEncoder encoder)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             try
             {
@@ -195,7 +195,7 @@ private static void AotCodec<TPixel>(IImageDecoder decoder, IImageEncoder encode
         /// </summary>
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         private static void AotCompilePixelOperations<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             var pixelOp = new PixelOperations<TPixel>();
             pixelOp.GetPixelBlender(PixelColorBlendingMode.Normal, PixelAlphaCompositionMode.Clear);

src/ImageSharp/Advanced/IImageVisitor.cs

@@ -17,6 +17,6 @@ public interface IImageVisitor
         /// <param name="image">The image.</param>
         /// <typeparam name="TPixel">The pixel type.</typeparam>
         void Visit<TPixel>(Image<TPixel> image)
-            where TPixel : struct, IPixel<TPixel>;
+            where TPixel : unmanaged, IPixel<TPixel>;
     }
 }

src/ImageSharp/Advanced/IPixelSource.cs

@@ -11,7 +11,7 @@ namespace SixLabors.ImageSharp.Advanced
     /// </summary>
     /// <typeparam name="TPixel">The type of the pixel.</typeparam>
     internal interface IPixelSource<TPixel>
-        where TPixel : struct, IPixel<TPixel>
+        where TPixel : unmanaged, IPixel<TPixel>
     {
         /// <summary>
         /// Gets the pixel buffer.

src/ImageSharp/Color/Color.cs

@@ -220,7 +220,7 @@ public Color WithAlpha(float alpha)
         /// <returns>The pixel value.</returns>
         [MethodImpl(InliningOptions.ShortMethod)]
         public TPixel ToPixel<TPixel>()
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             TPixel pixel = default;
             pixel.FromRgba64(this.data);
@@ -239,7 +239,7 @@ public static void ToPixel<TPixel>(
             Configuration configuration,
             ReadOnlySpan<Color> source,
             Span<TPixel> destination)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             ReadOnlySpan<Rgba64> rgba64Span = MemoryMarshal.Cast<Color, Rgba64>(source);
             PixelOperations<TPixel>.Instance.FromRgba64(configuration, rgba64Span, destination);

src/ImageSharp/Common/Helpers/Buffer2DUtils.cs

@@ -40,7 +40,7 @@ public static void Convolve4<TPixel>(
             int maxRow,
             int minColumn,
             int maxColumn)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             ComplexVector4 vector = default;
             int kernelLength = kernel.Length;

src/ImageSharp/Common/Helpers/DenseMatrixUtils.cs

@@ -42,7 +42,7 @@ public static void Convolve2D3<TPixel>(
             int maxRow,
             int minColumn,
             int maxColumn)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Convolve2DImpl(
                 in matrixY,
@@ -90,7 +90,7 @@ public static void Convolve2D4<TPixel>(
             int maxRow,
             int minColumn,
             int maxColumn)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Convolve2DImpl(
                 in matrixY,
@@ -121,7 +121,7 @@ public static void Convolve2DImpl<TPixel>(
             int minColumn,
             int maxColumn,
             out Vector4 vector)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Vector4 vectorY = default;
             Vector4 vectorX = default;
@@ -175,7 +175,7 @@ public static void Convolve3<TPixel>(
             int maxRow,
             int minColumn,
             int maxColumn)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Vector4 vector = default;
 
@@ -222,7 +222,7 @@ public static void Convolve4<TPixel>(
             int maxRow,
             int minColumn,
             int maxColumn)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Vector4 vector = default;
 
@@ -253,7 +253,7 @@ private static void ConvolveImpl<TPixel>(
             int minColumn,
             int maxColumn,
             ref Vector4 vector)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int matrixHeight = matrix.Rows;
             int matrixWidth = matrix.Columns;

src/ImageSharp/Common/Helpers/ImageMaths.cs

@@ -269,7 +269,7 @@ public static float SinC(float f)
         /// The <see cref="Rectangle"/>.
         /// </returns>
         public static Rectangle GetFilteredBoundingRectangle<TPixel>(ImageFrame<TPixel> bitmap, float componentValue, RgbaComponent channel = RgbaComponent.B)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int width = bitmap.Width;
             int height = bitmap.Height;

src/ImageSharp/Formats/Bmp/BmpDecoder.cs

@@ -29,7 +29,7 @@ public sealed class BmpDecoder : IImageDecoder, IBmpDecoderOptions, IImageInfoDe
 
         /// <inheritdoc/>
         public Image<TPixel> Decode<TPixel>(Configuration configuration, Stream stream)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             Guard.NotNull(stream, nameof(stream));
 

src/ImageSharp/Formats/Bmp/BmpDecoderCore.cs

@@ -131,7 +131,7 @@ public BmpDecoderCore(Configuration configuration, IBmpDecoderOptions options)
         /// </exception>
         /// <returns>The decoded image.</returns>
         public Image<TPixel> Decode<TPixel>(Stream stream)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             try
             {
@@ -256,7 +256,7 @@ private static int CalculatePadding(int width, int componentCount)
         /// <param name="pixels">The output pixel buffer containing the decoded image.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadBitFields<TPixel>(Buffer2D<TPixel> pixels, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             if (this.infoHeader.BitsPerPixel == 16)
             {
@@ -296,7 +296,7 @@ private void ReadBitFields<TPixel>(Buffer2D<TPixel> pixels, bool inverted)
         /// <param name="height">The height of the bitmap.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRle<TPixel>(BmpCompression compression, Buffer2D<TPixel> pixels, byte[] colors, int width, int height, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             TPixel color = default;
             using (IMemoryOwner<byte> buffer = this.memoryAllocator.Allocate<byte>(width * height, AllocationOptions.Clean))
@@ -376,7 +376,7 @@ private void ReadRle<TPixel>(BmpCompression compression, Buffer2D<TPixel> pixels
         /// <param name="height">The height of the bitmap.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRle24<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             TPixel color = default;
             using (IMemoryOwner<byte> buffer = this.memoryAllocator.Allocate<byte>(width * height * 3, AllocationOptions.Clean))
@@ -814,7 +814,7 @@ private static int RleSkipDelta(
         /// the bytes per color palette entry's can be 3 bytes instead of 4.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRgbPalette<TPixel>(Buffer2D<TPixel> pixels, byte[] colors, int width, int height, int bitsPerPixel, int bytesPerColorMapEntry, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             // Pixels per byte (bits per pixel).
             int ppb = 8 / bitsPerPixel;
@@ -872,7 +872,7 @@ private void ReadRgbPalette<TPixel>(Buffer2D<TPixel> pixels, byte[] colors, int
         /// <param name="greenMask">The bitmask for the green channel.</param>
         /// <param name="blueMask">The bitmask for the blue channel.</param>
         private void ReadRgb16<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted, int redMask = DefaultRgb16RMask, int greenMask = DefaultRgb16GMask, int blueMask = DefaultRgb16BMask)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int padding = CalculatePadding(width, 2);
             int stride = (width * 2) + padding;
@@ -939,7 +939,7 @@ private void ReadRgb16<TPixel>(Buffer2D<TPixel> pixels, int width, int height, b
         /// <param name="height">The height of the bitmap.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRgb24<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int padding = CalculatePadding(width, 3);
 
@@ -968,7 +968,7 @@ private void ReadRgb24<TPixel>(Buffer2D<TPixel> pixels, int width, int height, b
         /// <param name="height">The height of the bitmap.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRgb32Fast<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int padding = CalculatePadding(width, 4);
 
@@ -998,7 +998,7 @@ private void ReadRgb32Fast<TPixel>(Buffer2D<TPixel> pixels, int width, int heigh
         /// <param name="height">The height of the bitmap.</param>
         /// <param name="inverted">Whether the bitmap is inverted.</param>
         private void ReadRgb32Slow<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             int padding = CalculatePadding(width, 4);
 
@@ -1099,7 +1099,7 @@ private void ReadRgb32Slow<TPixel>(Buffer2D<TPixel> pixels, int width, int heigh
         /// <param name="blueMask">The bitmask for the blue channel.</param>
         /// <param name="alphaMask">The bitmask for the alpha channel.</param>
         private void ReadRgb32BitFields<TPixel>(Buffer2D<TPixel> pixels, int width, int height, bool inverted, int redMask, int greenMask, int blueMask, int alphaMask)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             TPixel color = default;
             int padding = CalculatePadding(width, 4);

src/ImageSharp/Formats/Bmp/BmpEncoder.cs

@@ -34,7 +34,7 @@ public sealed class BmpEncoder : IImageEncoder, IBmpEncoderOptions
 
         /// <inheritdoc/>
         public void Encode<TPixel>(Image<TPixel> image, Stream stream)
-            where TPixel : struct, IPixel<TPixel>
+            where TPixel : unmanaged, IPixel<TPixel>
         {
             var encoder = new BmpEncoderCore(this, image.GetMemoryAllocator());
             encoder.Encode(image, stream);