Final migrations

src/ImageSharp/Formats/Bmp/BmpEncoderCore.cs

@@ -348,17 +348,16 @@ namespace SixLabors.ImageSharp.Formats.Bmp
             where TPixel : unmanaged, IPixel<TPixel>
         {
             bool isL8 = typeof(TPixel) == typeof(L8);
-            using (IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.AllocateManagedByteBuffer(ColorPaletteSize8Bit, AllocationOptions.Clean))
+            using IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.Allocate<byte>(ColorPaletteSize8Bit, AllocationOptions.Clean);
+            Span<byte> colorPalette = colorPaletteBuffer.GetSpan();
+
+            if (isL8)
             {
-                Span<byte> colorPalette = colorPaletteBuffer.GetSpan();
-                if (isL8)
-                {
-                    this.Write8BitGray(stream, image, colorPalette);
-                }
-                else
-                {
-                    this.Write8BitColor(stream, image, colorPalette);
-                }
+                this.Write8BitGray(stream, image, colorPalette);
+            }
+            else
+            {
+                this.Write8BitColor(stream, image, colorPalette);
             }
         }
 
@@ -442,7 +441,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp
                 MaxColors = 16
             });
             using IndexedImageFrame<TPixel> quantized = frameQuantizer.BuildPaletteAndQuantizeFrame(image, image.Bounds());
-            using IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.AllocateManagedByteBuffer(ColorPaletteSize4Bit, AllocationOptions.Clean);
+            using IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.Allocate<byte>(ColorPaletteSize4Bit, AllocationOptions.Clean);
 
             Span<byte> colorPalette = colorPaletteBuffer.GetSpan();
             ReadOnlySpan<TPixel> quantizedColorPalette = quantized.Palette.Span;
@@ -486,7 +485,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp
                 MaxColors = 2
             });
             using IndexedImageFrame<TPixel> quantized = frameQuantizer.BuildPaletteAndQuantizeFrame(image, image.Bounds());
-            using IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.AllocateManagedByteBuffer(ColorPaletteSize1Bit, AllocationOptions.Clean);
+            using IMemoryOwner<byte> colorPaletteBuffer = this.memoryAllocator.Allocate<byte>(ColorPaletteSize1Bit, AllocationOptions.Clean);
 
             Span<byte> colorPalette = colorPaletteBuffer.GetSpan();
             ReadOnlySpan<TPixel> quantizedColorPalette = quantized.Palette.Span;

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
+using System.Buffers;
 using System.Buffers.Binary;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -928,9 +929,10 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         {
             int length = remaining;
 
-            using (IManagedByteBuffer huffmanData = this.Configuration.MemoryAllocator.AllocateManagedByteBuffer(256, AllocationOptions.Clean))
+            using (IMemoryOwner<byte> huffmanData = this.Configuration.MemoryAllocator.Allocate<byte>(256, AllocationOptions.Clean))
             {
-                ref byte huffmanDataRef = ref MemoryMarshal.GetReference(huffmanData.GetSpan());
+                Span<byte> huffmanDataSpan = huffmanData.GetSpan();
+                ref byte huffmanDataRef = ref MemoryMarshal.GetReference(huffmanDataSpan);
                 for (int i = 2; i < remaining;)
                 {
                     byte huffmanTableSpec = (byte)stream.ReadByte();
@@ -949,11 +951,12 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                         JpegThrowHelper.ThrowInvalidImageContentException("Bad Huffman Table index.");
                     }
 
-                    stream.Read(huffmanData.Array, 0, 16);
+                    stream.Read(huffmanDataSpan, 0, 16);
 
-                    using (IManagedByteBuffer codeLengths = this.Configuration.MemoryAllocator.AllocateManagedByteBuffer(17, AllocationOptions.Clean))
+                    using (IMemoryOwner<byte> codeLengths = this.Configuration.MemoryAllocator.Allocate<byte>(17, AllocationOptions.Clean))
                     {
-                        ref byte codeLengthsRef = ref MemoryMarshal.GetReference(codeLengths.GetSpan());
+                        Span<byte> codeLengthsSpan = codeLengths.GetSpan();
+                        ref byte codeLengthsRef = ref MemoryMarshal.GetReference(codeLengthsSpan);
                         int codeLengthSum = 0;
 
                         for (int j = 1; j < 17; j++)
@@ -968,17 +971,18 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                             JpegThrowHelper.ThrowInvalidImageContentException("Huffman table has excessive length.");
                         }
 
-                        using (IManagedByteBuffer huffmanValues = this.Configuration.MemoryAllocator.AllocateManagedByteBuffer(256, AllocationOptions.Clean))
+                        using (IMemoryOwner<byte> huffmanValues = this.Configuration.MemoryAllocator.Allocate<byte>(256, AllocationOptions.Clean))
                         {
-                            stream.Read(huffmanValues.Array, 0, codeLengthSum);
+                            Span<byte> huffmanValuesSpan = huffmanValues.GetSpan();
+                            stream.Read(huffmanValuesSpan, 0, codeLengthSum);
 
                             i += 17 + codeLengthSum;
 
                             this.BuildHuffmanTable(
                                 tableType == 0 ? this.dcHuffmanTables : this.acHuffmanTables,
                                 tableIndex,
-                                codeLengths.GetSpan(),
-                                huffmanValues.GetSpan());
+                                codeLengthsSpan,
+                                huffmanValuesSpan);
                         }
                     }
                 }

src/ImageSharp/Formats/Png/PngDecoderCore.cs

@@ -393,8 +393,8 @@ namespace SixLabors.ImageSharp.Formats.Png
                 this.bytesPerSample = this.header.BitDepth / 8;
             }
 
-            this.previousScanline = this.memoryAllocator.AllocateManagedByteBuffer(this.bytesPerScanline, AllocationOptions.Clean);
-            this.scanline = this.Configuration.MemoryAllocator.AllocateManagedByteBuffer(this.bytesPerScanline, AllocationOptions.Clean);
+            this.previousScanline = this.memoryAllocator.Allocate<byte>(this.bytesPerScanline, AllocationOptions.Clean);
+            this.scanline = this.Configuration.MemoryAllocator.Allocate<byte>(this.bytesPerScanline, AllocationOptions.Clean);
         }
 
         /// <summary>

src/ImageSharp/Formats/Tiff/Writers/TiffBiColorWriter{TPixel}.cs

@@ -60,7 +60,7 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Writers
             {
                 // Write uncompressed image.
                 int bytesPerStrip = this.BytesPerRow * height;
-                this.bitStrip ??= this.MemoryAllocator.AllocateManagedByteBuffer(bytesPerStrip);
+                this.bitStrip ??= this.MemoryAllocator.Allocate<byte>(bytesPerStrip);
                 this.pixelsAsGray ??= this.MemoryAllocator.Allocate<byte>(width);
                 Span<byte> pixelAsGraySpan = this.pixelsAsGray.GetSpan();
 

src/ImageSharp/Formats/Tiff/Writers/TiffPaletteWriter{TPixel}.cs

@@ -89,7 +89,7 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Writers
             else
             {
                 int stripPixels = width * height;
-                this.indexedPixelsBuffer ??= this.MemoryAllocator.AllocateManagedByteBuffer(stripPixels);
+                this.indexedPixelsBuffer ??= this.MemoryAllocator.Allocate<byte>(stripPixels);
                 Span<byte> indexedPixels = this.indexedPixelsBuffer.GetSpan();
                 int lastRow = y + height;
                 int indexedPixelsRowIdx = 0;
@@ -113,7 +113,7 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Writers
 
         private void AddColorMapTag()
         {
-            using IMemoryOwner<byte> colorPaletteBuffer = this.MemoryAllocator.AllocateManagedByteBuffer(this.colorPaletteBytes);
+            using IMemoryOwner<byte> colorPaletteBuffer = this.MemoryAllocator.Allocate<byte>(this.colorPaletteBytes);
             Span<byte> colorPalette = colorPaletteBuffer.GetSpan();
 
             ReadOnlySpan<TPixel> quantizedColors = this.quantizedImage.Palette.Span;

src/ImageSharp/Memory/Allocators/MemoryAllocator.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
 using System;
@@ -18,7 +18,7 @@ namespace SixLabors.ImageSharp.Memory
         protected internal abstract int GetBufferCapacityInBytes();
 
         /// <summary>
-        /// Allocates an <see cref="IMemoryOwner{T}" />, holding a <see cref="System.Memory{T}"/> of length <paramref name="length"/>.
+        /// Allocates an <see cref="IMemoryOwner{T}" />, holding a <see cref="Memory{T}"/> of length <paramref name="length"/>.
         /// </summary>
         /// <typeparam name="T">Type of the data stored in the buffer.</typeparam>
         /// <param name="length">Size of the buffer to allocate.</param>

tests/ImageSharp.Tests/Formats/Tiff/PhotometricInterpretation/RgbPlanarTiffColorTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
+using System.Buffers;
 using System.Collections.Generic;
 using SixLabors.ImageSharp.Formats.Tiff;
 using SixLabors.ImageSharp.Formats.Tiff.PhotometricInterpretation;
@@ -242,19 +243,31 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff.PhotometricInterpretation
         [MemberData(nameof(Rgb4Data))]
         [MemberData(nameof(Rgb8Data))]
         [MemberData(nameof(Rgb484_Data))]
-        public void Decode_WritesPixelData(byte[][] inputData, TiffBitsPerSample bitsPerSample, int left, int top, int width, int height, Rgba32[][] expectedResult)
-        {
-            AssertDecode(expectedResult, pixels =>
+        public void Decode_WritesPixelData(
+            byte[][] inputData,
+            TiffBitsPerSample bitsPerSample,
+            int left,
+            int top,
+            int width,
+            int height,
+            Rgba32[][] expectedResult)
+            => AssertDecode(
+                expectedResult,
+                pixels =>
                 {
-                    var buffers = new IManagedByteBuffer[inputData.Length];
+                    var buffers = new IMemoryOwner<byte>[inputData.Length];
                     for (int i = 0; i < buffers.Length; i++)
                     {
-                        buffers[i] = Configuration.Default.MemoryAllocator.AllocateManagedByteBuffer(inputData[i].Length);
+                        buffers[i] = Configuration.Default.MemoryAllocator.Allocate<byte>(inputData[i].Length);
                         ((Span<byte>)inputData[i]).CopyTo(buffers[i].GetSpan());
                     }
 
                     new RgbPlanarTiffColor<Rgba32>(bitsPerSample).Decode(buffers, pixels, left, top, width, height);
+
+                    foreach (IMemoryOwner<byte> buffer in buffers)
+                    {
+                        buffer.Dispose();
+                    }
                 });
-        }
     }
 }