Added DCT tests paths for nosimd/avx/avx+fma

tests/ImageSharp.Tests/Formats/Jpg/DCTTests.cs

@@ -7,7 +7,7 @@ using System.Runtime.Intrinsics.X86;
 #endif
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
 using SixLabors.ImageSharp.Tests.Formats.Jpg.Utils;
-
+using SixLabors.ImageSharp.Tests.TestUtilities;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -159,6 +159,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             [InlineData(2)]
             public void TransformIDCT(int seed)
             {
+                static void RunTest(string serialized)
+                {
+                    int seed = FeatureTestRunner.Deserialize<int>(serialized);
+
                     Span<float> src = Create8x8RoundedRandomFloatData(-200, 200, seed);
                     var srcBlock = default(Block8x8F);
                     srcBlock.LoadFrom(src);
@@ -181,6 +185,18 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
                     Assert.Equal(actualDest, expectedDest, new ApproximateFloatComparer(1f));
                 }
 
+                // 3 paths:
+                // 1. AllowAll - call avx/fma implementation
+                // 2. DisableFMA - call avx implementation without fma acceleration
+                // 3. DisableAvx - call fallback code of Vector4 implementation
+                //
+                // DisableSSE isn't needed because fallback Vector4 code will compile to either sse or fallback code with same result
+                FeatureTestRunner.RunWithHwIntrinsicsFeature(
+                    RunTest,
+                    seed,
+                    HwIntrinsics.AllowAll | HwIntrinsics.DisableFMA | HwIntrinsics.DisableAVX);
+            }
+
             // Forward transform
             [Theory]
             [InlineData(1)]
@@ -276,6 +292,10 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
             [InlineData(2)]
             public void TransformFDCT(int seed)
             {
+                static void RunTest(string serialized)
+                {
+                    int seed = FeatureTestRunner.Deserialize<int>(serialized);
+
                     Span<float> src = Create8x8RoundedRandomFloatData(-200, 200, seed);
                     var srcBlock = default(Block8x8F);
                     srcBlock.LoadFrom(src);
@@ -297,6 +317,18 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
                     Assert.Equal(actualDest, expectedDest, new ApproximateFloatComparer(1f));
                 }
+
+                // 3 paths:
+                // 1. AllowAll - call avx/fma implementation
+                // 2. DisableFMA - call avx implementation without fma acceleration
+                // 3. DisableAvx - call fallback code of Vector4 implementation
+                //
+                // DisableSSE isn't needed because fallback Vector4 code will compile to either sse or fallback code with same result
+                FeatureTestRunner.RunWithHwIntrinsicsFeature(
+                    RunTest,
+                    seed,
+                    HwIntrinsics.AllowAll | HwIntrinsics.DisableFMA | HwIntrinsics.DisableAVX);
+            }
         }
     }
 }