From 5fc3d37794bc1ece5bf024d85157123bccb6ce71 Mon Sep 17 00:00:00 2001
From: Ildar Khayrutdinov <ildarkhairutdin@gmail.com>
Date: Sat, 6 Feb 2021 23:14:38 +0300
Subject: [PATCH] Report palette lzw bug

---
 .../Formats/Tiff/TiffEncoderTests.cs               | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
index a79d84e109..774454259d 100644
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
@@ -210,7 +210,7 @@ public void TiffEncoder_EncodeColorPalette_WithDeflateCompressionAndPredictor_Wo
         public void TiffEncoder_EncodeColorPalette_WithLzwCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {
-            var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw };
+            var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw, PixelStorageMethod = TiffEncoderPixelStorageMethod.SingleStrip };
 
             this.TiffEncoderPaletteTest(provider, encoder);
         }
@@ -220,11 +220,21 @@ public void TiffEncoder_EncodeColorPalette_WithLzwCompression_Works<TPixel>(Test
         public void TiffEncoder_EncodeColorPalette_WithLzwCompressionAndPredictor_Works<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {
-            var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw, UseHorizontalPredictor = true };
+            var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw, UseHorizontalPredictor = true, PixelStorageMethod = TiffEncoderPixelStorageMethod.SingleStrip };
 
             this.TiffEncoderPaletteTest(provider, encoder);
         }
 
+        [Theory]
+        [WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
+        public void TiffEncoder_EncodeColorPalette_WithLzwCompressionAndPredictor_Bug<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            var encoder = new TiffEncoder { Mode = TiffEncodingMode.ColorPalette, Compression = TiffEncoderCompression.Lzw, PixelStorageMethod = TiffEncoderPixelStorageMethod.MultiStrip, UseHorizontalPredictor = true };
+
+            Assert.Throws<ImageDifferenceIsOverThresholdException>(() => this.TiffEncoderPaletteTest(provider, encoder));
+        }
+
         [Theory]
         [WithFile(Calliphora_PaletteUncompressed, PixelTypes.Rgba32)]
         public void TiffEncoder_EncodeColorPalette_WithPackBitsCompression_Works<TPixel>(TestImageProvider<TPixel> provider)