Minor cleanup

src/ImageSharp/Formats/Png/PngDecoderCore.cs

@@ -861,7 +861,7 @@ namespace SixLabors.ImageSharp.Formats.Png
 
             var rgba = default(Rgba32);
 
-            if (this.paletteAlpha != null && this.paletteAlpha.Length > 0)
+            if (this.paletteAlpha?.Length > 0)
             {
                 // If the alpha palette is not null and has one or more entries, this means, that the image contains an alpha
                 // channel and we should try to read it.
@@ -949,7 +949,7 @@ namespace SixLabors.ImageSharp.Formats.Png
                     var rgba = default(Rgba32);
                     Span<Rgb24> pal = MemoryMarshal.Cast<byte, Rgb24>(this.palette);
 
-                    if (this.paletteAlpha != null && this.paletteAlpha.Length > 0)
+                    if (this.paletteAlpha?.Length > 0)
                     {
                         // If the alpha palette is not null and has one or more entries, this means, that the image contains an alpha
                         // channel and we should try to read it.
@@ -1165,6 +1165,7 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// <summary>
         /// Reads a chunk from the stream.
         /// </summary>
+        /// <param name="chunk">The image format chunk.</param>
         /// <returns>
         /// The <see cref="PngChunk"/>.
         /// </returns>
@@ -1255,6 +1256,7 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// <summary>
         /// Skips the chunk data and the cycle redundancy chunk read from the data.
         /// </summary>
+        /// <param name="chunk">The image format chunk.</param>
         private void SkipChunkDataAndCrc(in PngChunk chunk)
         {
             this.currentStream.Skip(chunk.Length);

src/ImageSharp/PixelFormats/Rgba32.PixelOperations.cs

@@ -87,15 +87,15 @@ namespace SixLabors.ImageSharp.PixelFormats
             }
 
             /// <inheritdoc />
-            internal override void ToVector4(ReadOnlySpan<Rgba32> sourceColors, Span<Vector4> destVectors, int count)
+            internal override void ToVector4(ReadOnlySpan<Rgba32> sourceColors, Span<Vector4> destinationVectors, int count)
             {
                 Guard.MustBeSizedAtLeast(sourceColors, count, nameof(sourceColors));
-                Guard.MustBeSizedAtLeast(destVectors, count, nameof(destVectors));
+                Guard.MustBeSizedAtLeast(destinationVectors, count, nameof(destinationVectors));
 
                 if (count < 256 || !Vector.IsHardwareAccelerated)
                 {
                     // Doesn't worth to bother with SIMD:
-                    base.ToVector4(sourceColors, destVectors, count);
+                    base.ToVector4(sourceColors, destinationVectors, count);
                     return;
                 }
 
@@ -104,25 +104,25 @@ namespace SixLabors.ImageSharp.PixelFormats
 
                 if (alignedCount > 0)
                 {
-                    ToVector4SimdAligned(sourceColors, destVectors, alignedCount);
+                    ToVector4SimdAligned(sourceColors, destinationVectors, alignedCount);
                 }
 
                 if (remainder > 0)
                 {
                     sourceColors = sourceColors.Slice(alignedCount);
-                    destVectors = destVectors.Slice(alignedCount);
-                    base.ToVector4(sourceColors, destVectors, remainder);
+                    destinationVectors = destinationVectors.Slice(alignedCount);
+                    base.ToVector4(sourceColors, destinationVectors, remainder);
                 }
             }
 
             /// <inheritdoc />
-            internal override void PackFromVector4(ReadOnlySpan<Vector4> sourceVectors, Span<Rgba32> destColors, int count)
+            internal override void PackFromVector4(ReadOnlySpan<Vector4> sourceVectors, Span<Rgba32> destinationColors, int count)
             {
-                GuardSpans(sourceVectors, nameof(sourceVectors), destColors, nameof(destColors), count);
+                GuardSpans(sourceVectors, nameof(sourceVectors), destinationColors, nameof(destinationColors), count);
 
                 if (!SimdUtils.IsAvx2CompatibleArchitecture)
                 {
-                    base.PackFromVector4(sourceVectors, destColors, count);
+                    base.PackFromVector4(sourceVectors, destinationColors, count);
                     return;
                 }
 
@@ -132,7 +132,7 @@ namespace SixLabors.ImageSharp.PixelFormats
                 if (alignedCount > 0)
                 {
                     ReadOnlySpan<float> flatSrc = MemoryMarshal.Cast<Vector4, float>(sourceVectors.Slice(0, alignedCount));
-                    Span<byte> flatDest = MemoryMarshal.Cast<Rgba32, byte>(destColors);
+                    Span<byte> flatDest = MemoryMarshal.Cast<Rgba32, byte>(destinationColors);
 
                     SimdUtils.BulkConvertNormalizedFloatToByteClampOverflows(flatSrc, flatDest);
                 }
@@ -141,7 +141,7 @@ namespace SixLabors.ImageSharp.PixelFormats
                 {
                     // actually: remainder == 1
                     int lastIdx = count - 1;
-                    destColors[lastIdx].PackFromVector4(sourceVectors[lastIdx]);
+                    destinationColors[lastIdx].PackFromVector4(sourceVectors[lastIdx]);
                 }
             }
 

src/ImageSharp/PixelFormats/Rgba32.cs

@@ -199,7 +199,10 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc/>
         public uint PackedValue
         {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get => this.Rgba;
+
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
             set => this.Rgba = value;
         }
 
@@ -395,7 +398,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            return (obj is Rgba32) && this.Equals((Rgba32)obj);
+            return obj is Rgba32 rgba32 && this.Equals(rgba32);
         }
 
         /// <inheritdoc/>

src/ImageSharp/PixelFormats/Rgba64.cs

@@ -88,13 +88,11 @@ namespace SixLabors.ImageSharp.PixelFormats
         public Rgba64(ulong packed)
             : this()
         {
-            this.Rgba = packed;
+            this.PackedValue = packed;
         }
 
-        /// <summary>
-        /// Gets or sets the packed representation of the <see cref="Rgba64"/> struct.
-        /// </summary>
-        public ulong Rgba
+        /// <inheritdoc/>
+        public ulong PackedValue
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get => Unsafe.As<Rgba64, ulong>(ref this);
@@ -103,13 +101,6 @@ namespace SixLabors.ImageSharp.PixelFormats
             set => Unsafe.As<Rgba64, ulong>(ref this) = value;
         }
 
-        /// <inheritdoc/>
-        public ulong PackedValue
-        {
-            get => this.Rgba;
-            set => this.Rgba = value;
-        }
-
         /// <summary>
         /// Compares two <see cref="Rgba64"/> objects for equality.
         /// </summary>
@@ -125,7 +116,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator ==(Rgba64 left, Rgba64 right)
         {
-            return left.Rgba == right.Rgba;
+            return left.PackedValue == right.PackedValue;
         }
 
         /// <summary>
@@ -143,7 +134,7 @@ namespace SixLabors.ImageSharp.PixelFormats
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool operator !=(Rgba64 left, Rgba64 right)
         {
-            return left.Rgba != right.Rgba;
+            return left.PackedValue != right.PackedValue;
         }
 
         /// <inheritdoc />
@@ -272,14 +263,14 @@ namespace SixLabors.ImageSharp.PixelFormats
         /// <inheritdoc />
         public override bool Equals(object obj)
         {
-            return (obj is Rgba64) && this.Equals((Rgba64)obj);
+            return obj is Rgba64 rgba64 && this.Equals(rgba64);
         }
 
         /// <inheritdoc />
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public bool Equals(Rgba64 other)
         {
-            return this.Rgba == other.Rgba;
+            return this.PackedValue == other.PackedValue;
         }
 
         /// <inheritdoc />

tests/ImageSharp.Tests/PixelFormats/Rgba64Tests.cs

@@ -57,7 +57,7 @@ namespace SixLabors.ImageSharp.Tests.PixelFormats
             // arrange
             var pixel = default(Rgba64);
             var short4 = new Rgba64(Vector4.One);
-            ulong expected = 0xFFFFFFFFFFFFFFFF;
+            const ulong expected = 0xFFFFFFFFFFFFFFFF;
 
             // act 
             Vector4 scaled = short4.ToScaledVector4();