Merge branch 'af/UniformUnmanagedMemoryPoolMemoryAllocator-02' of https://github.com/SixLabors/ImageSharp into af/UniformUnmanagedMemoryPoolMemoryAllocator-02

src/ImageSharp/Formats/Jpeg/Components/Encoder/HuffmanScanEncoder.cs

@@ -650,6 +650,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
             }
 
             this.target.Write(this.streamWriteBuffer, 0, writeIdx);
+            this.emitWriteIndex = this.emitBuffer.Length;
         }
 
         /// <summary>
@@ -660,11 +661,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
         /// This must be called only if <see cref="IsStreamFlushNeeded"/> is true
         /// only during the macroblocks encoding routine.
         /// </remarks>
-        private void FlushToStream()
-        {
+        private void FlushToStream() =>
             this.FlushToStream(this.emitWriteIndex * 4);
-            this.emitWriteIndex = this.emitBuffer.Length;
-        }
 
         /// <summary>
         /// Flushes final cached bits to the stream padding 1's to
@@ -681,10 +679,11 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Encoder
             // And writing only valuable count of bytes count we want to write to the output stream
             int valuableBytesCount = (int)Numerics.DivideCeil((uint)this.bitCount, 8);
             uint packedBytes = this.accumulatedBits | (uint.MaxValue >> this.bitCount);
-            this.emitBuffer[--this.emitWriteIndex] = packedBytes;
+            this.emitBuffer[this.emitWriteIndex - 1] = packedBytes;
 
             // Flush cached bytes to the output stream with padding bits
-            this.FlushToStream((this.emitWriteIndex * 4) - 4 + valuableBytesCount);
+            int lastByteIndex = (this.emitWriteIndex * 4) - valuableBytesCount;
+            this.FlushToStream(lastByteIndex);
         }
     }
 }

src/ImageSharp/Formats/Webp/Lossless/Vp8LEncoder.cs

@@ -192,7 +192,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
         public bool UseCrossColorTransform { get; set; }
 
         /// <summary>
-        /// Gets or sets a value indicating whether to use the substract green transform.
+        /// Gets or sets a value indicating whether to use the subtract green transform.
         /// </summary>
         public bool UseSubtractGreenTransform { get; set; }
 
@@ -1050,7 +1050,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
                 return EntropyIx.Palette;
             }
 
-            using IMemoryOwner<uint> histoBuffer = this.memoryAllocator.Allocate<uint>((int)HistoIx.HistoTotal * 256);
+            using IMemoryOwner<uint> histoBuffer = this.memoryAllocator.Allocate<uint>((int)HistoIx.HistoTotal * 256, AllocationOptions.Clean);
             Span<uint> histo = histoBuffer.Memory.Span;
             uint pixPrev = bgra[0]; // Skip the first pixel.
             ReadOnlySpan<uint> prevRow = null;

tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs

@@ -101,6 +101,24 @@ namespace SixLabors.ImageSharp.Tests.Formats.Webp
             image.VerifyEncoder(provider, "webp", testOutputDetails, encoder);
         }
 
+        [Theory]
+        [WithFile(Lossy.NoFilter06, PixelTypes.Rgba32, 15114)]
+        public void Encode_Lossless_WithBestQuality_HasExpectedSize<TPixel>(TestImageProvider<TPixel> provider, int expectedBytes)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            var encoder = new WebpEncoder()
+            {
+                FileFormat = WebpFileFormatType.Lossless,
+                Method = WebpEncodingMethod.BestQuality
+            };
+
+            using Image<TPixel> image = provider.GetImage();
+            using var memoryStream = new MemoryStream();
+            image.Save(memoryStream, encoder);
+
+            Assert.Equal(memoryStream.Length, expectedBytes);
+        }
+
         [Theory]
         [WithFile(RgbTestPattern100x100, PixelTypes.Rgba32, 85)]
         [WithFile(RgbTestPattern100x100, PixelTypes.Rgba32, 60)]