From a963fa09adb839d9ddba40f2524cb6ed00b4ed13 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Fri, 18 Feb 2022 14:53:00 +0100
Subject: [PATCH] Add test for decoding only the first frame

---
 .../Formats/Tiff/TiffDecoderTests.cs                 | 12 ++++++++++++
 tests/ImageSharp.Tests/TestImages.cs                 |  1 +
 tests/Images/Input/Tiff/SKC1H3.tiff                  |  3 +++
 3 files changed, 16 insertions(+)
 create mode 100644 tests/Images/Input/Tiff/SKC1H3.tiff

diff --git a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
index ea0544acf4..51d38dc580 100644
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
@@ -4,6 +4,7 @@
 // ReSharper disable InconsistentNaming
 using System;
 using System.IO;
+using SixLabors.ImageSharp.Formats.Tiff;
 using SixLabors.ImageSharp.Metadata;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
@@ -365,6 +366,17 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         public void TiffDecoder_CanDecode_PackBitsCompressed<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 
+        [Theory]
+        [WithFile(MultiFrameMipMap, PixelTypes.Rgba32)]
+        public void CanDecodeJustOneFrame<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            using (Image<TPixel> image = provider.GetImage(new TiffDecoder() { DecodingMode = FrameDecodingMode.First }))
+            {
+                Assert.Equal(1, image.Frames.Count);
+            }
+        }
+
         [Theory]
         [WithFile(RgbJpegCompressed, PixelTypes.Rgba32)]
         [WithFile(RgbWithStripsJpegCompressed, PixelTypes.Rgba32)]
diff --git a/tests/ImageSharp.Tests/TestImages.cs b/tests/ImageSharp.Tests/TestImages.cs
index 8b943194a5..d7ac9c3641 100644
--- a/tests/ImageSharp.Tests/TestImages.cs
+++ b/tests/ImageSharp.Tests/TestImages.cs
@@ -867,6 +867,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string MultiframeDeflateWithPreview = "Tiff/multipage_deflate_withPreview.tiff";
             public const string MultiframeDifferentSize = "Tiff/multipage_differentSize.tiff";
             public const string MultiframeDifferentVariants = "Tiff/multipage_differentVariants.tiff";
+            public const string MultiFrameMipMap = "Tiff/SKC1H3.tiff";
 
             public const string LittleEndianByteOrder = "Tiff/little_endian.tiff";
 
diff --git a/tests/Images/Input/Tiff/SKC1H3.tiff b/tests/Images/Input/Tiff/SKC1H3.tiff
new file mode 100644
index 0000000000..9f9a50fdd6
--- /dev/null
+++ b/tests/Images/Input/Tiff/SKC1H3.tiff
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:938bbf1c0f8bdbea0c632bb8d51c1150f757f88b3779d7fa18c296a3a3f61e9b
+size 13720193