Add tests for predictor with alpha

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -287,6 +287,7 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 
         [Theory]
         [WithFile(Rgba8BitUnassociatedAlpha, PixelTypes.Rgba32)]
+        [WithFile(Rgba8BitUnassociatedAlphaWithPredictor, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_32Bit_WithUnassociatedAlpha<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {
@@ -425,12 +426,16 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
         [Theory]
         [WithFile(Rgba16BitUnassociatedAlphaBigEndian, PixelTypes.Rgba32)]
         [WithFile(Rgba16BitUnassociatedAlphaLittleEndian, PixelTypes.Rgba32)]
+        [WithFile(Rgba16BitUnassociatedAlphaBigEndianWithPredictor, PixelTypes.Rgba32)]
+        [WithFile(Rgba16BitUnassociatedAlphaLittleEndianWithPredictor, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_128Bit_UnassociatedAlpha<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 
         [Theory]
         [WithFile(Rgba32BitUnassociatedAlphaBigEndian, PixelTypes.Rgba32)]
         [WithFile(Rgba32BitUnassociatedAlphaLittleEndian, PixelTypes.Rgba32)]
+        [WithFile(Rgba32BitUnassociatedAlphaBigEndianWithPredictor, PixelTypes.Rgba32)]
+        [WithFile(Rgba32BitUnassociatedAlphaLittleEndianWithPredictor, PixelTypes.Rgba32)]
         public void TiffDecoder_CanDecode_128Bit_WithUnassociatedAlpha<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {

tests/ImageSharp.Tests/TestImages.cs

@@ -865,6 +865,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string Rgba5BitUnassociatedAlpha = "Tiff/RgbaUnassociatedAlpha5bit.tiff";
             public const string Rgba6BitUnassociatedAlpha = "Tiff/RgbaUnassociatedAlpha6bit.tiff";
             public const string Rgba8BitUnassociatedAlpha = "Tiff/RgbaUnassociatedAlpha8bit.tiff";
+            public const string Rgba8BitUnassociatedAlphaWithPredictor = "Tiff/RgbaUnassociatedAlphaPredictor8bit.tiff";
             public const string Rgba8BitPlanarUnassociatedAlpha = "Tiff/RgbaUnassociatedAlphaPlanar8bit.tiff";
             public const string Rgba10BitUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlpha10bit_msb.tiff";
             public const string Rgba10BitUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlpha10bit_lsb.tiff";
@@ -874,6 +875,8 @@ namespace SixLabors.ImageSharp.Tests
             public const string Rgba14BitUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlpha14bit_lsb.tiff";
             public const string Rgba16BitUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlpha16bit_msb.tiff";
             public const string Rgba16BitUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlpha16bit_lsb.tiff";
+            public const string Rgba16BitUnassociatedAlphaBigEndianWithPredictor = "Tiff/RgbaUnassociatedAlphaPredictor16bit_msb.tiff";
+            public const string Rgba16BitUnassociatedAlphaLittleEndianWithPredictor = "Tiff/RgbaUnassociatedAlphaPredictor16bit_lsb.tiff";
             public const string Rgba16BitPlanarUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlphaPlanar16bit_msb.tiff";
             public const string Rgba16BitPlanarUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlphaPlanar16bit_lsb.tiff";
             public const string Rgba24BitUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlpha24bit_msb.tiff";
@@ -882,6 +885,8 @@ namespace SixLabors.ImageSharp.Tests
             public const string Rgba24BitPlanarUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlphaPlanar24bit_lsb.tiff";
             public const string Rgba32BitUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlpha32bit_msb.tiff";
             public const string Rgba32BitUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlpha32bit_lsb.tiff";
+            public const string Rgba32BitUnassociatedAlphaBigEndianWithPredictor = "Tiff/RgbaUnassociatedAlphaPredictor32bit_msb.tiff";
+            public const string Rgba32BitUnassociatedAlphaLittleEndianWithPredictor = "Tiff/RgbaUnassociatedAlphaPredictor32bit_lsb.tiff";
             public const string Rgba32BitPlanarUnassociatedAlphaBigEndian = "Tiff/RgbaUnassociatedAlphaPlanar32bit_msb.tiff";
             public const string Rgba32BitPlanarUnassociatedAlphaLittleEndian = "Tiff/RgbaUnassociatedAlphaPlanar32bit_lsb.tiff";
 

tests/Images/Input/Tiff/RgbaUnassociatedAlphaPredictor16bit_lsb.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:874ef7a59491ba68364312b7bc27b6620d15ce8b1d5b780f57c6e6d8b919ef1f
+size 73922

tests/Images/Input/Tiff/RgbaUnassociatedAlphaPredictor16bit_msb.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d4faa8617d10ea5f79225c528c0a6d5c36f73d315e46150703df5ca5008ea1bd
+size 73922

tests/Images/Input/Tiff/RgbaUnassociatedAlphaPredictor32bit_lsb.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6a17791068b9c3eb40db3157a9103892aaf4a5a74072c93006bfa702ba5545e5
+size 80428

tests/Images/Input/Tiff/RgbaUnassociatedAlphaPredictor32bit_msb.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:63fef29d79f8d707c74b6e083de6bb2ad41dde1d9b1aea5bd7729a2f7399132e
+size 80344

tests/Images/Input/Tiff/RgbaUnassociatedAlphaPredictor8bit.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9d91f0740d6df983b5e5fe904c22fe86c2a7ffd86673fb078092d80c96359fc1
+size 53666