Enhance FloatRoundingComparer

tests/ImageSharp.Tests/TestUtilities/FloatRoundingComparer.cs

@@ -1,12 +1,13 @@
-namespace ImageSharp.Tests.TestUtilities
+namespace ImageSharp.Tests
 {
     using System;
     using System.Collections.Generic;
+    using System.Numerics;
 
     /// <summary>
     /// Allows the comparison of single-precision floating point values by precision.
     /// </summary>
-    public struct FloatRoundingComparer : IEqualityComparer<float>
+    public struct FloatRoundingComparer : IEqualityComparer<float>, IEqualityComparer<Vector4>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="FloatRoundingComparer"/> struct.
@@ -14,6 +15,7 @@
         /// <param name="precision">The number of decimal places (valid values: 0-7)</param>
         public FloatRoundingComparer(int precision)
         {
+            Guard.MustBeBetweenOrEqualTo(precision, 0, 7, nameof(precision));
             this.Precision = precision;
         }
 
@@ -31,6 +33,12 @@
             return Comparer<float>.Default.Compare(xp, yp) == 0;
         }
 
+        /// <inheritdoc />
+        public bool Equals(Vector4 x, Vector4 y)
+        {
+            return Equals(x.X, y.X) && Equals(x.Y, y.Y) && Equals(x.Z, y.Z) && Equals(x.W, y.W);
+        }
+
         /// <inheritdoc />
         public int GetHashCode(float obj)
         {
@@ -41,5 +49,16 @@
                 return hashCode;
             }
         }
+
+        /// <inheritdoc />
+        public int GetHashCode(Vector4 obj)
+        {
+            unchecked
+            {
+                int hashCode = obj.GetHashCode();
+                hashCode = (hashCode * 397) ^ this.Precision.GetHashCode();
+                return hashCode;
+            }
+        }
     }
 }