Parse HIF metadata

src/ImageSharp/Formats/Heic/Heic4CharCode.cs

@@ -124,15 +124,30 @@ public enum Heic4CharCode : uint
     ipma = 0x69706D61U,
 
     /// <summary>
-    /// High Efficient Image Coding.
+    /// High Efficient Image Coding brand.
     /// </summary>
     heic = 0x68656963U,
 
+    /// <summary>
+    /// High Efficient Image Coding brand (legacy name).
+    /// </summary>
+    heix = 0x68656978U,
+
+    /// <summary>
+    /// High Efficient File brand.
+    /// </summary>
+    hif1 = 0x68696631U,
+
     /// <summary>
     /// High Efficiency Coding tile.
     /// </summary>
     hvc1 = 0x68766331U,
 
+    /// <summary>
+    /// Legacy JPEG coded tile.
+    /// </summary>
+    jpeg = 0x6A706567U,
+
     /// <summary>
     /// Data Information.
     /// </summary>
@@ -203,4 +218,9 @@ public enum Heic4CharCode : uint
     /// </summary>
     pict = 0x70696374U,
 
+    /// <summary>
+    /// Unique Identifier.
+    /// </summary>
+    uuid = 0x75756964U,
+
 }

src/ImageSharp/Formats/Heic/Heic4CharCode.tt

@@ -29,8 +29,11 @@
         "udes", "User Description",
         "ipco", "Item Property Container",
         "ipma", "Item Property Association",
-        "heic", "High Efficient Image Coding",
+        "heic", "High Efficient Image Coding brand",
+        "heix", "High Efficient Image Coding brand (legacy name)",
+        "hif1", "High Efficient File brand",
         "hvc1", "High Efficiency Coding tile",
+        "jpeg", "Legacy JPEG coded tile",
         "dinf", "Data Information",
         "grpl", "Group list",
         "hdlr", "Handler",
@@ -45,6 +48,7 @@
         "mime", "MIME type",
         "uri ", "URI",
         "pict", "Picture handler type",
+        "uuid", "Unique Identifier",
     };
 #>
 

src/ImageSharp/Formats/Heic/HeicDecoderCore.cs

@@ -202,11 +202,12 @@ internal sealed class HeicDecoderCore : IImageDecoderInternals
                 case Heic4CharCode.idat:
                 case Heic4CharCode.grpl:
                 case Heic4CharCode.ipro:
+                case Heic4CharCode.uuid:
                     // Silently skip these boxes.
                     SkipBox(stream, length);
                     break;
                 default:
-                    throw new ImageFormatException($"Unknown metadata box type of '{Enum.GetName(boxType)}'");
+                    throw new ImageFormatException($"Unknown metadata box type of '{PrettyPrint(boxType)}'");
             }
         }
     }
@@ -373,8 +374,7 @@ internal sealed class HeicDecoderCore : IImageDecoderInternals
             }
             else
             {
-                string enumName = Enum.GetName(containerType) ?? ((uint)containerType).ToString("X", CultureInfo.InvariantCulture);
+                throw new ImageFormatException($"Unknown container type in property box of '{PrettyPrint(containerType)}'");
-                throw new ImageFormatException($"Unknown container type in property box of '{enumName}'");
             }
         }
     }
@@ -424,8 +424,7 @@ internal sealed class HeicDecoderCore : IImageDecoderInternals
                     // TODO: Implement
                     break;
                 default:
-                    string enumName = Enum.GetName(itemType) ?? ((uint)itemType).ToString("X", CultureInfo.InvariantCulture);
+                    throw new ImageFormatException($"Unknown item type in property box of '{PrettyPrint(itemType)}'");
-                    throw new ImageFormatException($"Unknown item type in property box of '{enumName}'");
             }
         }
     }
@@ -601,4 +600,17 @@ internal sealed class HeicDecoderCore : IImageDecoderInternals
         Span<byte> bytes = span[..span.IndexOf((byte)0)];
         return Encoding.UTF8.GetString(bytes);
     }
+
+    private static string PrettyPrint(Heic4CharCode code)
+    {
+        string? pretty = Enum.GetName(code);
+        if (string.IsNullOrEmpty(pretty))
+        {
+            Span<byte> bytes = stackalloc byte[4];
+            BinaryPrimitives.WriteUInt32BigEndian(bytes, (uint)code);
+            pretty = Encoding.ASCII.GetString(bytes);
+        }
+
+        return pretty;
+    }
 }

src/ImageSharp/Formats/Heic/HeicImageFormatDetector.cs

@@ -21,7 +21,9 @@ public sealed class HeicImageFormatDetector : IImageFormatDetector
         return format != null;
     }
 
-    private static bool IsSupportedFileFormat(ReadOnlySpan<byte> header) =>
+    private static bool IsSupportedFileFormat(ReadOnlySpan<byte> header) {
-        BinaryPrimitives.ReadUInt32BigEndian(header.Slice(4)) == (uint)Heic4CharCode.ftyp &&
+        bool hasFtyp = BinaryPrimitives.ReadUInt32BigEndian(header.Slice(4)) == (uint)Heic4CharCode.ftyp;
-        BinaryPrimitives.ReadUInt32BigEndian(header.Slice(8)) == (uint)Heic4CharCode.heic;
+        uint brand = BinaryPrimitives.ReadUInt32BigEndian(header.Slice(8));
+        return hasFtyp && (brand == (uint)Heic4CharCode.heic || brand == (uint)Heic4CharCode.heix);
+    }
 }

tests/ImageSharp.Tests/Formats/Heic/HeicDecoderTests.cs

@@ -13,6 +13,7 @@ public class HeicDecoderTests
     [Theory]
     [InlineData(TestImages.Heic.Image1)]
     [InlineData(TestImages.Heic.Sample640x427)]
+    [InlineData(TestImages.Heic.FujiFilmHif)]
     public void Identify(string imagePath)
     {
         TestFile testFile = TestFile.Create(imagePath);
@@ -27,8 +28,7 @@ public class HeicDecoderTests
     }
 
     [Theory]
-    [WithFile(TestImages.Heic.Image1, PixelTypes.Rgba32)]
+    [WithFile(TestImages.Heic.FujiFilmHif, PixelTypes.Rgba32)]
-    [WithFile(TestImages.Heic.Sample640x427, PixelTypes.Rgba32)]
     public void Decode<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel>
     {

tests/ImageSharp.Tests/TestImages.cs

@@ -1112,6 +1112,6 @@ public static class TestImages
         public const string Image3 = "Heic/image3.heic";
         public const string Image4 = "Heic/image4.heic";
         public const string Sample640x427 = "Heic/dwsample-heic-640.heic";
-        public const string FujiFilm-HIF = "Heic/IMG-20230508-0053.hif";
+        public const string FujiFilmHif = "Heic/IMG-20230508-0053.hif";
     }
 }