Add HadamardTransform sse tests

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

@@ -0,0 +1,58 @@
+// Copyright (c) Six Labors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Formats.Webp.Lossy;
+using SixLabors.ImageSharp.Tests.TestUtilities;
+using Xunit;
+
+namespace SixLabors.ImageSharp.Tests.Formats.WebP
+{
+    [Trait("Format", "Webp")]
+    public class LossyUtilsTests
+    {
+        private static void RunHadamardTransformTest()
+        {
+            byte[] a =
+            {
+                27, 27, 28, 29, 29, 28, 27, 27, 27, 28, 28, 29, 29, 28, 28, 27, 129, 129, 129, 129, 129, 129, 129,
+                129, 128, 128, 128, 128, 128, 128, 128, 128, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28, 28, 29, 29, 28,
+                28, 27, 129, 129, 129, 129, 129, 129, 129, 129, 128, 128, 128, 128, 128, 128, 128, 128, 27, 27, 26,
+                26, 26, 26, 27, 27, 27, 28, 28, 29, 29, 28, 28, 27, 129, 129, 129, 129, 129, 129, 129, 129, 128,
+                128, 128, 128, 128, 128, 128, 128, 28, 27, 27, 26, 26, 27, 27, 28, 27, 28, 28, 29, 29, 28, 28, 27
+            };
+
+            byte[] b =
+            {
+                28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 204, 204, 204, 204, 204, 204, 204,
+                204, 204, 204, 204, 204, 204, 204, 204, 204, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+                28, 28, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 204, 28, 28, 28,
+                28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 204, 204, 204, 204, 204, 204, 204, 204, 204,
+                204, 204, 204, 204, 204, 204, 204, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28
+            };
+
+            ushort[] w = { 38, 32, 20, 9, 32, 28, 17, 7, 20, 17, 10, 4, 9, 7, 4, 2 };
+            int expected = 2;
+
+            int actual = LossyUtils.Vp8Disto4X4(a, b, w);
+            Assert.Equal(expected, actual);
+        }
+
+        [Fact]
+        public void HadamardTransform_Works() => RunHadamardTransformTest();
+
+#if SUPPORTS_RUNTIME_INTRINSICS
+        [Fact]
+        public void HadamardTransform_WithHardwareIntrinsics_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunHadamardTransformTest, HwIntrinsics.AllowAll);
+
+        [Fact]
+        public void HadamardTransform_WithoutSSE2_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunHadamardTransformTest, HwIntrinsics.DisableSSE2);
+
+        [Fact]
+        public void HadamardTransform_WithoutSSE41_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunHadamardTransformTest, HwIntrinsics.DisableSSE41);
+
+        [Fact]
+        public void HadamardTransform_WithoutSSE2AndSSE41_Works() => FeatureTestRunner.RunWithHwIntrinsicsFeature(RunHadamardTransformTest, HwIntrinsics.DisableSSE41 | HwIntrinsics.DisableSSE2);
+#endif
+
+    }
+}