Merge branch 'master' into webp

README.md

@@ -70,7 +70,7 @@ To clone ImageSharp locally, click the "Clone in [YOUR_OS]" button above or run
 git clone https://github.com/SixLabors/ImageSharp
 ```
 
-If working with Windows please ensure that you have enabled log file paths in git (run as Administrator).
+If working with Windows please ensure that you have enabled long file paths in git (run as Administrator).
 
 ```bash
 git config --system core.longpaths true
@@ -130,4 +130,4 @@ Become a bronze sponsor with a monthly donation of $100 and get your logo (small
 <a href="https://opencollective.com/sixlabors/tiers/bronze-sponsors/7/website" target="_blank"><img src="https://opencollective.com/sixlabors/tiers/bronze-sponsors/7/avatar.svg?avatarHeight=96"></a>
 <a href="https://opencollective.com/sixlabors/tiers/bronze-sponsors/8/website" target="_blank"><img src="https://opencollective.com/sixlabors/tiers/bronze-sponsors/8/avatar.svg?avatarHeight=96"></a>
 <a href="https://opencollective.com/sixlabors/tiers/bronze-sponsors/9/website" target="_blank"><img src="https://opencollective.com/sixlabors/tiers/bronze-sponsors/9/avatar.svg?avatarHeight=96"></a>
-<a href="https://opencollective.com/sixlabors/tiers/bronze-sponsors/10/website" target="_blank"><img src="https://opencollective.com/sixlabors/tiers/bronze-sponsors/10/avatar.svg?avatarHeight=96"></a>
+<a href="https://opencollective.com/sixlabors/tiers/bronze-sponsors/10/website" target="_blank"><img src="https://opencollective.com/sixlabors/tiers/bronze-sponsors/10/avatar.svg?avatarHeight=96"></a>

src/ImageSharp/Formats/Gif/GifDecoderCore.cs

@@ -535,7 +535,8 @@ namespace SixLabors.ImageSharp.Formats.Gif
                 return;
             }
 
-            Buffer2DRegion<TPixel> pixelRegion = frame.PixelBuffer.GetRegion(this.restoreArea.Value);
+            var interest = Rectangle.Intersect(frame.Bounds(), this.restoreArea.Value);
+            Buffer2DRegion<TPixel> pixelRegion = frame.PixelBuffer.GetRegion(interest);
             pixelRegion.Clear();
 
             this.restoreArea = null;

src/ImageSharp/Formats/Jpeg/Components/Block8x8F.cs

@@ -18,6 +18,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
     /// <summary>
     /// Represents a Jpeg block with <see cref="float"/> coefficients.
     /// </summary>
+    [StructLayout(LayoutKind.Sequential)]
     internal partial struct Block8x8F : IEquatable<Block8x8F>
     {
         /// <summary>
@@ -51,9 +52,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         public Vector4 V7R;
 #pragma warning restore SA1600 // ElementsMustBeDocumented
 
-        private static readonly Vector4 NegativeOne = new Vector4(-1);
-        private static readonly Vector4 Offset = new Vector4(.5F);
-
         /// <summary>
         /// Get/Set scalar elements at a given index
         /// </summary>
@@ -61,7 +59,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// <returns>The float value at the specified index</returns>
         public float this[int idx]
         {
-            [MethodImpl(InliningOptions.ShortMethod)]
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get
             {
                 GuardBlockIndex(idx);
@@ -69,7 +67,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
                 return Unsafe.Add(ref selfRef, idx);
             }
 
-            [MethodImpl(InliningOptions.ShortMethod)]
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             set
             {
                 GuardBlockIndex(idx);
@@ -155,10 +153,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// </summary>
         [MethodImpl(InliningOptions.ShortMethod)]
         public void Clear()
-        {
-            // The cheapest way to do this in C#:
-            this = default;
-        }
+            => this = default; // The cheapest way to do this in C#:
 
         /// <summary>
         /// Load raw 32bit floating point data from source.
@@ -180,9 +175,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// <param name="source">Source</param>
         [MethodImpl(InliningOptions.ShortMethod)]
         public static unsafe void LoadFrom(Block8x8F* blockPtr, Span<float> source)
-        {
-            blockPtr->LoadFrom(source);
-        }
+            => blockPtr->LoadFrom(source);
 
         /// <summary>
         /// Load raw 32bit floating point data from source
@@ -236,9 +229,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// <param name="dest">The destination.</param>
         [MethodImpl(InliningOptions.ShortMethod)]
         public static unsafe void ScaledCopyTo(Block8x8F* blockPtr, Span<float> dest)
-        {
-            blockPtr->ScaledCopyTo(dest);
-        }
+            => blockPtr->ScaledCopyTo(dest);
 
         /// <summary>
         /// Copy raw 32bit floating point data to dest
@@ -439,7 +430,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// <param name="blockPtr">The block pointer.</param>
         /// <param name="qtPtr">The qt pointer.</param>
         /// <param name="unzigPtr">Unzig pointer</param>
-        // [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static unsafe void DequantizeBlock(Block8x8F* blockPtr, Block8x8F* qtPtr, byte* unzigPtr)
         {
             float* b = (float*)blockPtr;
@@ -556,22 +546,60 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         [MethodImpl(InliningOptions.ShortMethod)]
         private static void DivideRoundAll(ref Block8x8F a, ref Block8x8F b)
         {
-            a.V0L = DivideRound(a.V0L, b.V0L);
-            a.V0R = DivideRound(a.V0R, b.V0R);
-            a.V1L = DivideRound(a.V1L, b.V1L);
-            a.V1R = DivideRound(a.V1R, b.V1R);
-            a.V2L = DivideRound(a.V2L, b.V2L);
-            a.V2R = DivideRound(a.V2R, b.V2R);
-            a.V3L = DivideRound(a.V3L, b.V3L);
-            a.V3R = DivideRound(a.V3R, b.V3R);
-            a.V4L = DivideRound(a.V4L, b.V4L);
-            a.V4R = DivideRound(a.V4R, b.V4R);
-            a.V5L = DivideRound(a.V5L, b.V5L);
-            a.V5R = DivideRound(a.V5R, b.V5R);
-            a.V6L = DivideRound(a.V6L, b.V6L);
-            a.V6R = DivideRound(a.V6R, b.V6R);
-            a.V7L = DivideRound(a.V7L, b.V7L);
-            a.V7R = DivideRound(a.V7R, b.V7R);
+#if SUPPORTS_RUNTIME_INTRINSICS
+            if (Avx.IsSupported)
+            {
+                var vnegOne = Vector256.Create(-1f);
+                var vadd = Vector256.Create(.5F);
+                var vone = Vector256.Create(1f);
+
+                ref Vector256<float> aBase = ref Unsafe.AsRef(Unsafe.As<Vector4, Vector256<float>>(ref a.V0L));
+                ref Vector256<float> bBase = ref Unsafe.AsRef(Unsafe.As<Vector4, Vector256<float>>(ref b.V0L));
+                ref Vector256<float> aEnd = ref Unsafe.Add(ref aBase, 8);
+
+                do
+                {
+                    Vector256<float> voff = Avx.Multiply(Avx.Min(Avx.Max(vnegOne, aBase), vone), vadd);
+                    Unsafe.Add(ref aBase, 0) = Avx.Add(Avx.Divide(aBase, bBase), voff);
+
+                    aBase = ref Unsafe.Add(ref aBase, 1);
+                    bBase = ref Unsafe.Add(ref bBase, 1);
+                }
+                while (Unsafe.IsAddressLessThan(ref aBase, ref aEnd));
+            }
+            else
+#endif
+            {
+                a.V0L = DivideRound(a.V0L, b.V0L);
+                a.V0R = DivideRound(a.V0R, b.V0R);
+                a.V1L = DivideRound(a.V1L, b.V1L);
+                a.V1R = DivideRound(a.V1R, b.V1R);
+                a.V2L = DivideRound(a.V2L, b.V2L);
+                a.V2R = DivideRound(a.V2R, b.V2R);
+                a.V3L = DivideRound(a.V3L, b.V3L);
+                a.V3R = DivideRound(a.V3R, b.V3R);
+                a.V4L = DivideRound(a.V4L, b.V4L);
+                a.V4R = DivideRound(a.V4R, b.V4R);
+                a.V5L = DivideRound(a.V5L, b.V5L);
+                a.V5R = DivideRound(a.V5R, b.V5R);
+                a.V6L = DivideRound(a.V6L, b.V6L);
+                a.V6R = DivideRound(a.V6R, b.V6R);
+                a.V7L = DivideRound(a.V7L, b.V7L);
+                a.V7R = DivideRound(a.V7R, b.V7R);
+            }
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static Vector4 DivideRound(Vector4 dividend, Vector4 divisor)
+        {
+            var neg = new Vector4(-1);
+            var add = new Vector4(.5F);
+
+            // sign(dividend) = max(min(dividend, 1), -1)
+            Vector4 sign = Numerics.Clamp(dividend, neg, Vector4.One);
+
+            // AlmostRound(dividend/divisor) = dividend/divisor + 0.5*sign(dividend)
+            return (dividend / divisor) + (sign * add);
         }
 
         public void RoundInto(ref Block8x8 dest)
@@ -673,8 +701,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
 
         /// <inheritdoc />
         public bool Equals(Block8x8F other)
-        {
-            return this.V0L == other.V0L
+            => this.V0L == other.V0L
             && this.V0R == other.V0R
             && this.V1L == other.V1L
             && this.V1R == other.V1R
@@ -690,7 +717,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
             && this.V6R == other.V6R
             && this.V7L == other.V7L
             && this.V7R == other.V7R;
-        }
 
         /// <inheritdoc />
         public override string ToString()
@@ -718,16 +744,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
             return row.FastRound();
         }
 
-        [MethodImpl(InliningOptions.ShortMethod)]
-        private static Vector4 DivideRound(Vector4 dividend, Vector4 divisor)
-        {
-            // sign(dividend) = max(min(dividend, 1), -1)
-            Vector4 sign = Numerics.Clamp(dividend, NegativeOne, Vector4.One);
-
-            // AlmostRound(dividend/divisor) = dividend/divisor + 0.5*sign(dividend)
-            return (dividend / divisor) + (sign * Offset);
-        }
-
         [Conditional("DEBUG")]
         private static void GuardBlockIndex(int idx)
         {

src/ImageSharp/Formats/Jpeg/Components/Encoder/YCbCrForwardConverter{TPixel}.cs

@@ -59,9 +59,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
         /// <summary>
         /// Converts a 8x8 image area inside 'pixels' at position (x,y) placing the result members of the structure (<see cref="Y"/>, <see cref="Cb"/>, <see cref="Cr"/>)
         /// </summary>
-        public void Convert(ImageFrame<TPixel> frame, int x, int y, in RowOctet<TPixel> currentRows)
+        public void Convert(ImageFrame<TPixel> frame, int x, int y, ref RowOctet<TPixel> currentRows)
         {
-            this.pixelBlock.LoadAndStretchEdges(frame.PixelBuffer, x, y, currentRows);
+            this.pixelBlock.LoadAndStretchEdges(frame.PixelBuffer, x, y, ref currentRows);
 
             Span<Rgb24> rgbSpan = this.rgbBlock.AsSpanUnsafe();
             PixelOperations<TPixel>.Instance.ToRgb24(frame.GetConfiguration(), this.pixelBlock.AsSpanUnsafe(), rgbSpan);
@@ -76,7 +76,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
             }
             else
             {
-                this.colorTables.Convert(rgbSpan,  ref yBlock, ref cbBlock, ref crBlock);
+                this.colorTables.Convert(rgbSpan, ref yBlock, ref cbBlock, ref crBlock);
             }
         }
     }

src/ImageSharp/Formats/Jpeg/Components/GenericBlock8x8.cs

@@ -57,7 +57,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
         /// Load a 8x8 region of an image into the block.
         /// The "outlying" area of the block will be stretched out with pixels on the right and bottom edge of the image.
         /// </summary>
-        public void LoadAndStretchEdges(Buffer2D<T> source, int sourceX, int sourceY, in RowOctet<T> currentRows)
+        public void LoadAndStretchEdges(Buffer2D<T> source, int sourceX, int sourceY, ref RowOctet<T> currentRows)
         {
             int width = Math.Min(8, source.Width - sourceX);
             int height = Math.Min(8, source.Height - sourceY);

src/ImageSharp/Formats/Jpeg/Components/RowOctet.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
 using System;
@@ -12,39 +12,24 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
     /// Cache 8 pixel rows on the stack, which may originate from different buffers of a <see cref="MemoryGroup{T}"/>.
     /// </summary>
     [StructLayout(LayoutKind.Sequential)]
-    internal readonly ref struct RowOctet<T>
+    internal ref struct RowOctet<T>
         where T : struct
     {
-        private readonly Span<T> row0;
-        private readonly Span<T> row1;
-        private readonly Span<T> row2;
-        private readonly Span<T> row3;
-        private readonly Span<T> row4;
-        private readonly Span<T> row5;
-        private readonly Span<T> row6;
-        private readonly Span<T> row7;
-
-        public RowOctet(Buffer2D<T> buffer, int startY)
-        {
-            int y = startY;
-            int height = buffer.Height;
-            this.row0 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row1 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row2 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row3 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row4 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row5 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row6 = y < height ? buffer.GetRowSpan(y++) : default;
-            this.row7 = y < height ? buffer.GetRowSpan(y) : default;
-        }
+        private Span<T> row0;
+        private Span<T> row1;
+        private Span<T> row2;
+        private Span<T> row3;
+        private Span<T> row4;
+        private Span<T> row5;
+        private Span<T> row6;
+        private Span<T> row7;
 
+        // No unsafe tricks, since Span<T> can't be used as a generic argument
         public Span<T> this[int y]
         {
-            [MethodImpl(InliningOptions.ShortMethod)]
-            get
-            {
-                // No unsafe tricks, since Span<T> can't be used as a generic argument
-                return y switch
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get =>
+                y switch
                 {
                     0 => this.row0,
                     1 => this.row1,
@@ -56,13 +41,57 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
                     7 => this.row7,
                     _ => ThrowIndexOutOfRangeException()
                 };
+
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            private set
+            {
+                switch (y)
+                {
+                    case 0:
+                        this.row0 = value;
+                        break;
+                    case 1:
+                        this.row1 = value;
+                        break;
+                    case 2:
+                        this.row2 = value;
+                        break;
+                    case 3:
+                        this.row3 = value;
+                        break;
+                    case 4:
+                        this.row4 = value;
+                        break;
+                    case 5:
+                        this.row5 = value;
+                        break;
+                    case 6:
+                        this.row6 = value;
+                        break;
+                    default:
+                        this.row7 = value;
+                        break;
+                }
             }
         }
 
-        [MethodImpl(InliningOptions.ColdPath)]
-        private static Span<T> ThrowIndexOutOfRangeException()
+        [MethodImpl(InliningOptions.ShortMethod)]
+        public void Update(Buffer2D<T> buffer, int startY)
         {
-            throw new IndexOutOfRangeException();
+            // We don't actually have to assign values outside of the
+            // frame pixel buffer since they are never requested.
+            int y = startY;
+            int yEnd = Math.Min(y + 8, buffer.Height);
+
+            int i = 0;
+            while (y < yEnd)
+            {
+                this[i++] = buffer.GetRowSpan(y++);
+            }
         }
+
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static Span<T> ThrowIndexOutOfRangeException()
+        => throw new IndexOutOfRangeException();
     }
 }

src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs

@@ -6,6 +6,7 @@ using System.Buffers.Binary;
 using System.IO;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using System.Threading;
 using SixLabors.ImageSharp.Common.Helpers;
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
@@ -313,7 +314,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// </summary>
         /// <param name="bits">The packed bits.</param>
         /// <param name="count">The number of bits</param>
-        private void Emit(uint bits, uint count)
+        /// <param name="emitBufferBase">The reference to the emitBuffer.</param>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        private void Emit(uint bits, uint count, ref byte emitBufferBase)
         {
             count += this.bitCount;
             bits <<= (int)(32 - count);
@@ -327,10 +330,10 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 while (count >= 8)
                 {
                     byte b = (byte)(bits >> 24);
-                    this.emitBuffer[len++] = b;
-                    if (b == 0xff)
+                    Unsafe.Add(ref emitBufferBase, len++) = b;
+                    if (b == byte.MaxValue)
                     {
-                        this.emitBuffer[len++] = 0x00;
+                        Unsafe.Add(ref emitBufferBase, len++) = byte.MinValue;
                     }
 
                     bits <<= 8;
@@ -352,11 +355,12 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// </summary>
         /// <param name="index">The index of the Huffman encoder</param>
         /// <param name="value">The value to encode.</param>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private void EmitHuff(HuffIndex index, int value)
+        /// <param name="emitBufferBase">The reference to the emit buffer.</param>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        private void EmitHuff(HuffIndex index, int value, ref byte emitBufferBase)
         {
             uint x = HuffmanLut.TheHuffmanLut[(int)index].Values[value];
-            this.Emit(x & ((1 << 24) - 1), x >> 24);
+            this.Emit(x & ((1 << 24) - 1), x >> 24, ref emitBufferBase);
         }
 
         /// <summary>
@@ -365,8 +369,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// <param name="index">The index of the Huffman encoder</param>
         /// <param name="runLength">The number of copies to encode.</param>
         /// <param name="value">The value to encode.</param>
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private void EmitHuffRLE(HuffIndex index, int runLength, int value)
+        /// <param name="emitBufferBase">The reference to the emit buffer.</param>
+        [MethodImpl(InliningOptions.ShortMethod)]
+        private void EmitHuffRLE(HuffIndex index, int runLength, int value, ref byte emitBufferBase)
         {
             int a = value;
             int b = value;
@@ -386,10 +391,10 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 bt = 8 + (uint)BitCountLut[a >> 8];
             }
 
-            this.EmitHuff(index, (int)((uint)(runLength << 4) | bt));
+            this.EmitHuff(index, (int)((uint)(runLength << 4) | bt), ref emitBufferBase);
             if (bt > 0)
             {
-                this.Emit((uint)b & (uint)((1 << ((int)bt)) - 1), bt);
+                this.Emit((uint)b & (uint)((1 << ((int)bt)) - 1), bt, ref emitBufferBase);
             }
         }
 
@@ -399,7 +404,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         /// <param name="pixels">The pixel accessor providing access to the image pixels.</param>
         /// <param name="cancellationToken">The token to monitor for cancellation.</param>
-        private void Encode444<TPixel>(Image<TPixel> pixels, CancellationToken cancellationToken)
+        /// <param name="emitBufferBase">The reference to the emit buffer.</param>
+        private void Encode444<TPixel>(Image<TPixel> pixels, CancellationToken cancellationToken, ref byte emitBufferBase)
             where TPixel : unmanaged, IPixel<TPixel>
         {
             // TODO: Need a JpegScanEncoder<TPixel> class or struct that encapsulates the scan-encoding implementation. (Similar to JpegScanDecoder.)
@@ -418,15 +424,16 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             var pixelConverter = YCbCrForwardConverter<TPixel>.Create();
             ImageFrame<TPixel> frame = pixels.Frames.RootFrame;
             Buffer2D<TPixel> pixelBuffer = frame.PixelBuffer;
+            RowOctet<TPixel> currentRows = default;
 
             for (int y = 0; y < pixels.Height; y += 8)
             {
                 cancellationToken.ThrowIfCancellationRequested();
-                var currentRows = new RowOctet<TPixel>(pixelBuffer, y);
+                currentRows.Update(pixelBuffer, y);
 
                 for (int x = 0; x < pixels.Width; x += 8)
                 {
-                    pixelConverter.Convert(frame, x, y, currentRows);
+                    pixelConverter.Convert(frame, x, y, ref currentRows);
 
                     prevDCY = this.WriteBlock(
                         QuantIndex.Luminance,
@@ -435,7 +442,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         ref temp1,
                         ref temp2,
                         ref onStackLuminanceQuantTable,
-                        ref unzig);
+                        ref unzig,
+                        ref emitBufferBase);
+
                     prevDCCb = this.WriteBlock(
                         QuantIndex.Chrominance,
                         prevDCCb,
@@ -443,7 +452,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         ref temp1,
                         ref temp2,
                         ref onStackChrominanceQuantTable,
-                        ref unzig);
+                        ref unzig,
+                        ref emitBufferBase);
+
                     prevDCCr = this.WriteBlock(
                         QuantIndex.Chrominance,
                         prevDCCr,
@@ -451,7 +462,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         ref temp1,
                         ref temp2,
                         ref onStackChrominanceQuantTable,
-                        ref unzig);
+                        ref unzig,
+                        ref emitBufferBase);
                 }
             }
         }
@@ -517,9 +529,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// <param name="tempDest2">Temporal block 2</param>
         /// <param name="quant">Quantization table</param>
         /// <param name="unZig">The 8x8 Unzig block.</param>
-        /// <returns>
-        /// The <see cref="int"/>
-        /// </returns>
+        /// <param name="emitBufferBase">The reference to the emit buffer.</param>
+        /// <returns>The <see cref="int"/>.</returns>
         private int WriteBlock(
             QuantIndex index,
             int prevDC,
@@ -527,7 +538,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             ref Block8x8F tempDest1,
             ref Block8x8F tempDest2,
             ref Block8x8F quant,
-            ref ZigZag unZig)
+            ref ZigZag unZig,
+            ref byte emitBufferBase)
         {
             FastFloatingPointDCT.TransformFDCT(ref src, ref tempDest1, ref tempDest2);
 
@@ -536,7 +548,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             int dc = (int)tempDest2[0];
 
             // Emit the DC delta.
-            this.EmitHuffRLE((HuffIndex)((2 * (int)index) + 0), 0, dc - prevDC);
+            this.EmitHuffRLE((HuffIndex)((2 * (int)index) + 0), 0, dc - prevDC, ref emitBufferBase);
 
             // Emit the AC components.
             var h = (HuffIndex)((2 * (int)index) + 1);
@@ -554,18 +566,18 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 {
                     while (runLength > 15)
                     {
-                        this.EmitHuff(h, 0xf0);
+                        this.EmitHuff(h, 0xf0, ref emitBufferBase);
                         runLength -= 16;
                     }
 
-                    this.EmitHuffRLE(h, runLength, ac);
+                    this.EmitHuffRLE(h, runLength, ac, ref emitBufferBase);
                     runLength = 0;
                 }
             }
 
             if (runLength > 0)
             {
-                this.EmitHuff(h, 0x00);
+                this.EmitHuff(h, 0x00, ref emitBufferBase);
             }
 
             return dc;
@@ -747,9 +759,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// </summary>
         /// <param name="app1Length">The length of the data the app1 marker contains.</param>
         private void WriteApp1Header(int app1Length)
-        {
-            this.WriteAppHeader(app1Length, JpegConstants.Markers.APP1);
-        }
+            => this.WriteAppHeader(app1Length, JpegConstants.Markers.APP1);
 
         /// <summary>
         /// Writes a AppX header.
@@ -953,19 +963,19 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             // TODO: Need a JpegScanEncoder<TPixel> class or struct that encapsulates the scan-encoding implementation. (Similar to JpegScanDecoder.)
             // TODO: We should allow grayscale writing.
             this.outputStream.Write(SosHeaderYCbCr);
-
+            ref byte emitBufferBase = ref MemoryMarshal.GetReference<byte>(this.emitBuffer);
             switch (this.subsample)
             {
                 case JpegSubsample.Ratio444:
-                    this.Encode444(image, cancellationToken);
+                    this.Encode444(image, cancellationToken, ref emitBufferBase);
                     break;
                 case JpegSubsample.Ratio420:
-                    this.Encode420(image, cancellationToken);
+                    this.Encode420(image, cancellationToken, ref emitBufferBase);
                     break;
             }
 
             // Pad the last byte with 1's.
-            this.Emit(0x7f, 7);
+            this.Emit(0x7f, 7, ref emitBufferBase);
         }
 
         /// <summary>
@@ -975,7 +985,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         /// <typeparam name="TPixel">The pixel format.</typeparam>
         /// <param name="pixels">The pixel accessor providing access to the image pixels.</param>
         /// <param name="cancellationToken">The token to monitor for cancellation.</param>
-        private void Encode420<TPixel>(Image<TPixel> pixels, CancellationToken cancellationToken)
+        /// <param name="emitBufferBase">The reference to the emit buffer.</param>
+        private void Encode420<TPixel>(Image<TPixel> pixels, CancellationToken cancellationToken, ref byte emitBufferBase)
             where TPixel : unmanaged, IPixel<TPixel>
         {
             // TODO: Need a JpegScanEncoder<TPixel> class or struct that encapsulates the scan-encoding implementation. (Similar to JpegScanDecoder.)
@@ -997,6 +1008,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             int prevDCY = 0, prevDCCb = 0, prevDCCr = 0;
             ImageFrame<TPixel> frame = pixels.Frames.RootFrame;
             Buffer2D<TPixel> pixelBuffer = frame.PixelBuffer;
+            RowOctet<TPixel> currentRows = default;
 
             for (int y = 0; y < pixels.Height; y += 16)
             {
@@ -1008,10 +1020,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         int xOff = (i & 1) * 8;
                         int yOff = (i & 2) * 4;
 
-                        // TODO: Try pushing this to the outer loop!
-                        var currentRows = new RowOctet<TPixel>(pixelBuffer, y + yOff);
-
-                        pixelConverter.Convert(frame, x + xOff, y + yOff, currentRows);
+                        currentRows.Update(pixelBuffer, y + yOff);
+                        pixelConverter.Convert(frame, x + xOff, y + yOff, ref currentRows);
 
                         cb[i] = pixelConverter.Cb;
                         cr[i] = pixelConverter.Cr;
@@ -1023,7 +1033,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                             ref temp1,
                             ref temp2,
                             ref onStackLuminanceQuantTable,
-                            ref unzig);
+                            ref unzig,
+                            ref emitBufferBase);
                     }
 
                     Block8x8F.Scale16X16To8X8(ref b, cb);
@@ -1034,7 +1045,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         ref temp1,
                         ref temp2,
                         ref onStackChrominanceQuantTable,
-                        ref unzig);
+                        ref unzig,
+                        ref emitBufferBase);
 
                     Block8x8F.Scale16X16To8X8(ref b, cr);
                     prevDCCr = this.WriteBlock(
@@ -1044,7 +1056,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         ref temp1,
                         ref temp2,
                         ref onStackChrominanceQuantTable,
-                        ref unzig);
+                        ref unzig,
+                        ref emitBufferBase);
                 }
             }
         }

src/ImageSharp/Processing/Processors/Transforms/Resize/ResizeKernel.cs

@@ -72,7 +72,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Transforms
         public Vector4 ConvolveCore(ref Vector4 rowStartRef)
         {
 #if SUPPORTS_RUNTIME_INTRINSICS
-            if (Fma.IsSupported)
+            if (Avx2.IsSupported && Fma.IsSupported)
             {
                 float* bufferStart = this.bufferPtr;
                 float* bufferEnd = bufferStart + (this.Length & ~3);

tests/ImageSharp.Benchmarks/Codecs/Jpeg/BlockOperations/Block8x8F_Scale16X16To8X8.cs

@@ -1,3 +1,6 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
 using System;
 using BenchmarkDotNet.Attributes;
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
@@ -15,7 +18,7 @@ namespace SixLabors.ImageSharp.Benchmarks.Format.Jpeg.Components
         {
             var random = new Random();
 
-            float[] f = new float[8*8];
+            float[] f = new float[8 * 8];
             for (int i = 0; i < f.Length; i++)
             {
                 f[i] = (float)random.NextDouble();

tests/ImageSharp.Benchmarks/Codecs/Jpeg/EncodeJpeg.cs

@@ -16,17 +16,20 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
         private Stream bmpStream;
         private SDImage bmpDrawing;
         private Image<Rgba32> bmpCore;
+        private MemoryStream destinationStream;
 
         [GlobalSetup]
         public void ReadImages()
         {
             if (this.bmpStream == null)
             {
-                const string TestImage = TestImages.Bmp.Car;
+                const string TestImage = TestImages.Jpeg.BenchmarkSuite.Jpeg420Exif_MidSizeYCbCr;
                 this.bmpStream = File.OpenRead(Path.Combine(TestEnvironment.InputImagesDirectoryFullPath, TestImage));
                 this.bmpCore = Image.Load<Rgba32>(this.bmpStream);
+                this.bmpCore.Metadata.ExifProfile = null;
                 this.bmpStream.Position = 0;
                 this.bmpDrawing = SDImage.FromStream(this.bmpStream);
+                this.destinationStream = new MemoryStream();
             }
         }
 
@@ -42,15 +45,15 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs.Jpeg
         [Benchmark(Baseline = true, Description = "System.Drawing Jpeg")]
         public void JpegSystemDrawing()
         {
-            using var stream = new MemoryStream();
-            this.bmpDrawing.Save(stream, ImageFormat.Jpeg);
+            this.bmpDrawing.Save(this.destinationStream, ImageFormat.Jpeg);
+            this.destinationStream.Seek(0, SeekOrigin.Begin);
         }
 
         [Benchmark(Description = "ImageSharp Jpeg")]
         public void JpegCore()
         {
-            using var stream = new MemoryStream();
-            this.bmpCore.SaveAsJpeg(stream);
+            this.bmpCore.SaveAsJpeg(this.destinationStream);
+            this.destinationStream.Seek(0, SeekOrigin.Begin);
         }
     }
 }

tests/ImageSharp.Tests.ProfilingSandbox/Program.cs

@@ -31,14 +31,21 @@ namespace SixLabors.ImageSharp.Tests.ProfilingSandbox
         /// </param>
         public static void Main(string[] args)
         {
+            RunJpegEncoderProfilingTests();
             // RunJpegColorProfilingTests();
-            RunDecodeJpegProfilingTests();
+            // RunDecodeJpegProfilingTests();
             // RunToVector4ProfilingTest();
             // RunResizeProfilingTest();
 
             Console.ReadLine();
         }
 
+        private static void RunJpegEncoderProfilingTests()
+        {
+            var benchmarks = new JpegProfilingBenchmarks(new ConsoleOutput());
+            benchmarks.EncodeJpeg_SingleMidSize();
+        }
+
         private static void RunJpegColorProfilingTests()
         {
             new JpegColorConverterTests(new ConsoleOutput()).BenchmarkYCbCr(false);

tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs

@@ -171,6 +171,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
             }
         }
 
+        // https://github.com/SixLabors/ImageSharp/issues/1503
+        [Theory]
+        [WithFile(TestImages.Gif.Issues.Issue1530, PixelTypes.Rgba32)]
+        public void Issue1530_BadDescriptorDimensions<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            using Image<TPixel> image = provider.GetImage();
+            image.DebugSaveMultiFrame(provider);
+            image.CompareToReferenceOutputMultiFrame(provider, ImageComparer.Exact);
+        }
+
         // https://github.com/SixLabors/ImageSharp/issues/405
         [Theory]
         [WithFile(TestImages.Gif.Issues.BadAppExtLength, PixelTypes.Rgba32)]
@@ -181,6 +192,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Gif
             using (Image<TPixel> image = provider.GetImage())
             {
                 image.DebugSave(provider);
+
                 image.CompareFirstFrameToReferenceOutput(ImageComparer.Exact, provider);
             }
         }

tests/ImageSharp.Tests/Formats/Jpg/GenericBlock8x8Tests.cs

@@ -42,8 +42,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             using (Image<TPixel> s = provider.GetImage())
             {
                 var d = default(GenericBlock8x8<TPixel>);
-                var rowOctet = new RowOctet<TPixel>(s.GetRootFramePixelBuffer(), 0);
-                d.LoadAndStretchEdges(s.Frames.RootFrame.PixelBuffer, 0, 0, rowOctet);
+                RowOctet<TPixel> rowOctet = default;
+                rowOctet.Update(s.GetRootFramePixelBuffer(), 0);
+                d.LoadAndStretchEdges(s.Frames.RootFrame.PixelBuffer, 0, 0, ref rowOctet);
 
                 TPixel a = s.Frames.RootFrame[0, 0];
                 TPixel b = d[0, 0];
@@ -67,8 +68,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             using (Image<TPixel> s = provider.GetImage())
             {
                 var d = default(GenericBlock8x8<TPixel>);
-                var rowOctet = new RowOctet<TPixel>(s.GetRootFramePixelBuffer(), 7);
-                d.LoadAndStretchEdges(s.Frames.RootFrame.PixelBuffer, 6, 7, rowOctet);
+                RowOctet<TPixel> rowOctet = default;
+                rowOctet.Update(s.GetRootFramePixelBuffer(), 7);
+
+                d.LoadAndStretchEdges(s.Frames.RootFrame.PixelBuffer, 6, 7, ref rowOctet);
 
                 Assert.Equal(s[6, 7], d[0, 0]);
                 Assert.Equal(s[6, 8], d[0, 1]);

tests/ImageSharp.Tests/Image/ImageTests.WrapMemory.cs

@@ -375,7 +375,7 @@ namespace SixLabors.ImageSharp.Tests
                 var array = new Rgba32[size];
                 var memory = new Memory<Rgba32>(array);
 
-               Image.WrapMemory(memory, height, width);
+                Image.WrapMemory(memory, height, width);
             }
 
             private class TestMemoryOwner<T> : IMemoryOwner<T>

tests/ImageSharp.Tests/Processing/Transforms/ResizeTests.cs

@@ -1,8 +1,10 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
+using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Processing;
 using SixLabors.ImageSharp.Processing.Processors.Transforms;
+using SixLabors.ImageSharp.Tests.TestUtilities;
 using Xunit;
 
 namespace SixLabors.ImageSharp.Tests.Processing.Transforms
@@ -85,5 +87,24 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
             Assert.Equal(compand, resizeOptions.Compand);
             Assert.Equal(mode, resizeOptions.Mode);
         }
+
+#if SUPPORTS_RUNTIME_INTRINSICS
+        [Fact]
+        public void HwIntrinsics_Resize()
+        {
+            static void RunTest()
+            {
+                using var image = new Image<Rgba32>(50, 50);
+                image.Mutate(img => img.Resize(25, 25));
+
+                Assert.Equal(25, image.Width);
+                Assert.Equal(25, image.Height);
+            }
+
+            FeatureTestRunner.RunWithHwIntrinsicsFeature(
+                RunTest,
+                HwIntrinsics.AllowAll | HwIntrinsics.DisableAVX2 | HwIntrinsics.DisableFMA);
+        }
+#endif
     }
 }

tests/ImageSharp.Tests/ProfilingBenchmarks/JpegProfilingBenchmarks.cs

@@ -75,6 +75,21 @@ namespace SixLabors.ImageSharp.Tests.ProfilingBenchmarks
 #pragma warning restore SA1515 // Single-line comment should be preceded by blank line
         }
 
+        [Fact(Skip = ProfilingSetup.SkipProfilingTests)]
+        public void EncodeJpeg_SingleMidSize()
+        {
+            string path = TestFile.GetInputFileFullPath(TestImages.Jpeg.BenchmarkSuite.Jpeg420Exif_MidSizeYCbCr);
+            using var image = Image.Load(path);
+            image.Metadata.ExifProfile = null;
+
+            using var ms = new MemoryStream();
+            for (int i = 0; i < 30; i++)
+            {
+                image.SaveAsJpeg(ms);
+                ms.Seek(0, SeekOrigin.Begin);
+            }
+        }
+
         // Benchmark, enable manually!
         [Theory(Skip = ProfilingSetup.SkipProfilingTests)]
         [InlineData(1, 75, JpegSubsample.Ratio420)]

tests/ImageSharp.Tests/TestImages.cs

@@ -416,6 +416,7 @@ namespace SixLabors.ImageSharp.Tests
                 public const string BadAppExtLength_2 = "Gif/issues/issue405_badappextlength252-2.gif";
                 public const string BadDescriptorWidth = "Gif/issues/issue403_baddescriptorwidth.gif";
                 public const string Issue1505 = "Gif/issues/issue1505_argumentoutofrange.png";
+                public const string Issue1530 = "Gif/issues/issue1530.gif";
             }
 
             public static readonly string[] All = { Rings, Giphy, Cheers, Trans, Kumin, Leo, Ratio4x1, Ratio1x4 };

tests/ImageSharp.Tests/TestUtilities/TestEnvironment.cs

@@ -263,7 +263,7 @@ namespace SixLabors.ImageSharp.Tests
         private static string GetNetCoreVersion()
         {
             Assembly assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;
-            string[] assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
+            string[] assemblyPath = assembly.Location.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
             int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");
             if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)
             {

tests/ImageSharp.Tests/TestUtilities/Tests/FeatureTestRunnerTests.cs

@@ -25,9 +25,9 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
 
         [Theory]
         [MemberData(nameof(Intrinsics))]
-        public void ToFeatureCollectionReturnsExpectedResult(HwIntrinsics expectedItrinsics, string[] expectedValues)
+        public void ToFeatureCollectionReturnsExpectedResult(HwIntrinsics expectedIntrinsics, string[] expectedValues)
         {
-            Dictionary<HwIntrinsics, string> features = expectedItrinsics.ToFeatureKeyValueCollection();
+            Dictionary<HwIntrinsics, string> features = expectedIntrinsics.ToFeatureKeyValueCollection();
             HwIntrinsics[] keys = features.Keys.ToArray();
 
             HwIntrinsics actualIntrinsics = keys[0];
@@ -36,7 +36,7 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests
                 actualIntrinsics |= keys[i];
             }
 
-            Assert.Equal(expectedItrinsics, actualIntrinsics);
+            Assert.Equal(expectedIntrinsics, actualIntrinsics);
 
             IEnumerable<string> actualValues = features.Select(x => x.Value);
             Assert.Equal(expectedValues, actualValues);

tests/Images/External

@@ -1 +1 @@
-Subproject commit 346070e5ba538f1a3bbafc0ea7367404c5f8c9ab
+Subproject commit 1df65162448996332449387a46da942e181043c8

tests/Images/Input/Gif/issues/issue1530.gif

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:08b33cab34de2622a7d22edff25fe479a5018c2e0fbc65870b2f21ea7901fc61
+size 1844876