cache max value

src/ImageSharp/Formats/Jpeg/Components/Decoder/ColorConverters/JpegColorConverter.FromCmyk.cs

@@ -25,11 +25,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters
 
                 var v = new Vector4(0, 0, 0, 1F);
 
-                var scale = new Vector4(
+                var maximum = 1 / this.MaximumValue;
-                                1 / this.MaximumValue,
+                var scale = new Vector4(maximum, maximum, maximum, 1F);
-                                1 / this.MaximumValue,
-                                1 / this.MaximumValue,
-                                1F);
 
                 for (int i = 0; i < result.Length; i++)
                 {

src/ImageSharp/Formats/Jpeg/Components/Decoder/ColorConverters/JpegColorConverter.FromGrayScale.cs

@@ -20,11 +20,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters
             public override void ConvertToRgba(in ComponentValues values, Span<Vector4> result)
             {
                 var maximum = 1 / this.MaximumValue;
-                var scale = new Vector4(
+                var scale = new Vector4(maximum, maximum, maximum, 1F);
-                                maximum,
-                                maximum,
-                                maximum,
-                                1F);
 
                 ref float sBase = ref MemoryMarshal.GetReference(values.Component0);
                 ref Vector4 dBase = ref MemoryMarshal.GetReference(result);

src/ImageSharp/Formats/Jpeg/Components/Decoder/ColorConverters/JpegColorConverter.FromRgb.cs

@@ -24,11 +24,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters
 
                 var v = new Vector4(0, 0, 0, 1);
 
-                var scale = new Vector4(
+                var maximum = 1 / this.MaximumValue;
-                                1 / this.MaximumValue,
+                var scale = new Vector4(maximum, maximum, maximum, 1F);
-                                1 / this.MaximumValue,
-                                1 / this.MaximumValue,
-                                1F);
 
                 for (int i = 0; i < result.Length; i++)
                 {

src/ImageSharp/Formats/Jpeg/Components/Decoder/ColorConverters/JpegColorConverter.FromYccK.cs

@@ -25,11 +25,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder.ColorConverters
 
                 var v = new Vector4(0, 0, 0, 1F);
 
-                var scale = new Vector4(
+                var maximum = 1 / this.MaximumValue;
-                                1 / this.MaximumValue,
+                var scale = new Vector4(maximum, maximum, maximum, 1F);
-                                1 / this.MaximumValue,
-                                1 / this.MaximumValue,
-                                1F);
 
                 for (int i = 0; i < result.Length; i++)
                 {