Report 1-bit mode bug. Enable test images. Change test files.

tests/ImageSharp.Benchmarks/Codecs/DecodeTiff.cs

@@ -53,12 +53,12 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs
         [Params(
             TestImages.Tiff.CcittFax3AllTermCodes,
             TestImages.Tiff.HuffmanRleAllMakeupCodes,
-            TestImages.Tiff.GrayscaleUncompressed,
-            TestImages.Tiff.PaletteUncompressed,
-            TestImages.Tiff.RgbDeflate,
-            TestImages.Tiff.RgbLzwPredictor,
-            TestImages.Tiff.RgbPackbits,
-            TestImages.Tiff.RgbUncompressed)]
+            TestImages.Tiff.Calliphora_GrayscaleUncompressed,
+            TestImages.Tiff.Calliphora_RgbPaletteLzw_Predictor,
+            TestImages.Tiff.Calliphora_RgbDeflate_Predictor,
+            TestImages.Tiff.Calliphora_RgbLzwPredictor,
+            TestImages.Tiff.Calliphora_RgbPackbits,
+            TestImages.Tiff.Calliphora_RgbUncompressed)]
         public string TestImage { get; set; }
 #endif
 

tests/ImageSharp.Benchmarks/Codecs/EncodeTiff.cs

@@ -24,14 +24,14 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs
 
         private string TestImageFullPath => Path.Combine(TestEnvironment.InputImagesDirectoryFullPath, this.TestImage);
 
-        [Params(TestImages.Tiff.RgbUncompressed)]
+        [Params(TestImages.Tiff.Calliphora_RgbUncompressed)]
         public string TestImage { get; set; }
 
         [Params(
             TiffEncoderCompression.None,
-            ////TiffEncoderCompression.Deflate,
+            TiffEncoderCompression.Deflate,
             TiffEncoderCompression.Lzw,
-            ////TiffEncoderCompression.PackBits,
+            TiffEncoderCompression.PackBits,
             TiffEncoderCompression.CcittGroup3Fax,
             TiffEncoderCompression.ModifiedHuffman)]
         public TiffEncoderCompression Compression { get; set; }
@@ -70,7 +70,15 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs
         [Benchmark(Description = "ImageSharp Tiff")]
         public void TiffCore()
         {
-            var encoder = new TiffEncoder() { Compression = this.Compression };
+            TiffEncodingMode mode = TiffEncodingMode.Default;
+
+            // workaround for 1-bit bug
+            if (this.Compression == TiffEncoderCompression.CcittGroup3Fax || this.Compression == TiffEncoderCompression.ModifiedHuffman)
+            {
+                mode = TiffEncodingMode.BiColor;
+            }
+
+            var encoder = new TiffEncoder() { Compression = this.Compression, Mode = mode };
             using var memoryStream = new MemoryStream();
             this.core.SaveAsTiff(memoryStream, encoder);
         }
@@ -107,7 +115,7 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs
                     return EncoderValue.CompressionLZW;
 
                 default:
-                    throw new System.ArgumentOutOfRangeException(nameof(compression));
+                    throw new System.NotSupportedException(compression.ToString());
             }
         }
     }

tests/ImageSharp.Benchmarks/Config.cs

@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.Benchmarks
             }
 #endif
 
-            this.SummaryStyle = SummaryStyle.Default.WithMaxParameterColumnWidth(40);
+            this.SummaryStyle = SummaryStyle.Default.WithMaxParameterColumnWidth(50);
         }
 
         public class MultiFramework : Config

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

@@ -90,6 +90,40 @@ namespace SixLabors.ImageSharp.Tests.Formats.Tiff
             Assert.Equal(expectedBitsPerPixel, meta.BitsPerPixel);
         }
 
+        [Theory]
+        [WithFile(RgbUncompressed, PixelTypes.Rgba32, TiffEncoderCompression.CcittGroup3Fax, TiffCompression.CcittGroup3Fax)]
+        [WithFile(RgbUncompressed, PixelTypes.Rgba32, TiffEncoderCompression.ModifiedHuffman, TiffCompression.Ccitt1D)]
+        [WithFile(GrayscaleUncompressed, PixelTypes.L8, TiffEncoderCompression.CcittGroup3Fax, TiffCompression.CcittGroup3Fax)]
+        [WithFile(PaletteDeflateMultistrip, PixelTypes.L8, TiffEncoderCompression.ModifiedHuffman, TiffCompression.Ccitt1D)]
+        public void TiffEncoder_CorrectBiMode_Bug<TPixel>(TestImageProvider<TPixel> provider, TiffEncoderCompression compression, TiffCompression expectedCompression)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            // arrange
+            var encoder = new TiffEncoder() { Compression = compression };
+            using Image<TPixel> input = provider.GetImage();
+            using var memStream = new MemoryStream();
+
+            // act
+            input.Save(memStream, encoder);
+
+            // assert
+            memStream.Position = 0;
+            using var output = Image.Load<Rgba32>(this.configuration, memStream);
+            TiffMetadata meta = output.Metadata.GetTiffMetadata();
+
+            // This is bug!
+            // BitsPerPixel must be 1, and compression must be eqals which was setted in encoder
+            Assert.NotEqual(TiffBitsPerPixel.Pixel1, meta.BitsPerPixel);
+            Assert.NotEqual(expectedCompression, meta.Compression);
+
+            Assert.Equal(input.Metadata.GetTiffMetadata().BitsPerPixel, meta.BitsPerPixel);
+            Assert.Equal(TiffCompression.None, meta.Compression);
+
+            // expected values
+            //// Assert.Equal(TiffBitsPerPixel.Pixel1, meta.BitsPerPixel);
+            //// Assert.Equal(expectedCompression, meta.Compression);
+        }
+
         [Theory]
         [WithFile(Calliphora_RgbUncompressed, PixelTypes.Rgba32)]
         public void TiffEncoder_EncodeRgb_Works<TPixel>(TestImageProvider<TPixel> provider)