Added TryGetTag

Author: stefannikolei

src/ImageSharp/ColorProfiles/Icc/IccConverterBase.Checks.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Diagnostics.CodeAnalysis;
 using SixLabors.ImageSharp.Metadata.Profiles.Icc;
 
 namespace SixLabors.ImageSharp.ColorProfiles.Conversion.Icc;
@@ -145,8 +146,15 @@ private static ConversionMethod CheckMethod2(IccProfile profile)
     private static bool HasTag(IccProfile profile, IccProfileTag tag)
         => profile.Entries.Any(t => t.TagSignature == tag);
 
-    private static IccTagDataEntry GetTag(IccProfile profile, IccProfileTag tag)
-        => Array.Find(profile.Entries, t => t.TagSignature == tag) ?? throw new InvalidOperationException();
+    private static bool TryGetTag(IccProfile profile, IccProfileTag tag, [NotNullWhen(true)] out IccTagDataEntry? entry)
+    {
+        entry = GetTag(profile, tag);
+
+        return entry is not null;
+    }
+
+    private static IccTagDataEntry? GetTag(IccProfile profile, IccProfileTag tag)
+        => Array.Find(profile.Entries, t => t.TagSignature == tag);
 
     private static T? GetTag<T>(IccProfile profile, IccProfileTag tag)
         where T : IccTagDataEntry

src/ImageSharp/ColorProfiles/Icc/IccConverterbase.Conversions.cs

@@ -79,9 +79,9 @@ private static ColorTrcCalculator InitColorTrc(IccProfile profile, bool toPcs)
         IccXyzTagDataEntry? greenMatrixColumn = GetTag<IccXyzTagDataEntry>(profile, IccProfileTag.GreenMatrixColumn);
         IccXyzTagDataEntry? blueMatrixColumn = GetTag<IccXyzTagDataEntry>(profile, IccProfileTag.BlueMatrixColumn);
 
-        IccTagDataEntry? redTrc = GetTag(profile, IccProfileTag.RedTrc);
-        IccTagDataEntry? greenTrc = GetTag(profile, IccProfileTag.GreenTrc);
-        IccTagDataEntry? blueTrc = GetTag(profile, IccProfileTag.BlueTrc);
+        IccTagDataEntry? redTrc = GetTag<IccTagDataEntry>(profile, IccProfileTag.RedTrc);
+        IccTagDataEntry? greenTrc = GetTag<IccTagDataEntry>(profile, IccProfileTag.GreenTrc);
+        IccTagDataEntry? blueTrc = GetTag<IccTagDataEntry>(profile, IccProfileTag.BlueTrc);
 
         if (redMatrixColumn == null ||
             greenMatrixColumn == null ||
@@ -105,7 +105,11 @@ private static ColorTrcCalculator InitColorTrc(IccProfile profile, bool toPcs)
 
     private static GrayTrcCalculator InitGrayTrc(IccProfile profile, bool toPcs)
     {
-        IccTagDataEntry? entry = GetTag(profile, IccProfileTag.GrayTrc);
-        return new GrayTrcCalculator(entry, toPcs);
+        if (TryGetTag(profile, IccProfileTag.GrayTrc, out IccTagDataEntry? entry))
+        {
+            return new GrayTrcCalculator(entry, toPcs);
+        }
+
+        throw new InvalidIccProfileException("Missing GrayTRC entry.");
     }
 }