Add NotNullWhen to TryGetLinearlySeparableComponents

src/ImageSharp/Processing/Processors/Convolution/ConvolutionProcessorHelpers.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Diagnostics.CodeAnalysis;
+
 namespace SixLabors.ImageSharp.Processing.Processors.Convolution;
 
 internal static class ConvolutionProcessorHelpers
@@ -98,7 +100,7 @@ internal static class ConvolutionProcessorHelpers
     /// <param name="row">The resulting 1D row vector, if possible.</param>
     /// <param name="column">The resulting 1D column vector, if possible.</param>
     /// <returns>Whether or not <paramref name="matrix"/> was linearly separable.</returns>
-    public static bool TryGetLinearlySeparableComponents(this DenseMatrix<float> matrix, out float[]? row, out float[]? column)
+    public static bool TryGetLinearlySeparableComponents(this DenseMatrix<float> matrix, [NotNullWhen(true)] out float[]? row, [NotNullWhen(true)] out float[]? column)
     {
         int height = matrix.Rows;
         int width = matrix.Columns;