Merge pull request #2916 from SixLabors/js/fix-2909

V4 - Use BPP from Color Writer for Compressor

src/ImageSharp/Formats/Tiff/TiffEncoderCore.cs

@@ -222,15 +222,6 @@ internal sealed class TiffEncoderCore
         height = Math.Min(height, frame.Height);
         Size encodingSize = new(width, height);
 
-        using TiffBaseCompressor compressor = TiffCompressorFactory.Create(
-            compression,
-            writer.BaseStream,
-            this.memoryAllocator,
-            width,
-            (int)bitsPerPixel,
-            this.compressionLevel,
-            this.HorizontalPredictor == TiffPredictor.Horizontal ? this.HorizontalPredictor.Value : TiffPredictor.None);
-
         TiffEncoderEntriesCollector entriesCollector = new();
         using TiffBaseColorWriter<TPixel> colorWriter = TiffColorWriterFactory.Create(
             this.PhotometricInterpretation,
@@ -243,6 +234,15 @@ internal sealed class TiffEncoderCore
             entriesCollector,
             (int)bitsPerPixel);
 
+        using TiffBaseCompressor compressor = TiffCompressorFactory.Create(
+            compression,
+            writer.BaseStream,
+            this.memoryAllocator,
+            width,
+            colorWriter.BitsPerPixel,
+            this.compressionLevel,
+            this.HorizontalPredictor == TiffPredictor.Horizontal ? this.HorizontalPredictor.Value : TiffPredictor.None);
+
         int rowsPerStrip = CalcRowsPerStrip(height, colorWriter.BytesPerRow, this.CompressionType);
 
         colorWriter.Write(compressor, rowsPerStrip);

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

@@ -579,6 +579,16 @@ public class TiffEncoderTests : TiffEncoderBaseTester
     public void TiffEncoder_EncodeBiColor_WithModifiedHuffmanCompression_BlackIsZero_Works<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel> => TestTiffEncoderCore(provider, TiffBitsPerPixel.Bit1, TiffPhotometricInterpretation.BlackIsZero, TiffCompression.Ccitt1D);
 
+    [Theory]
+    [WithFile(Issue2909, PixelTypes.Rgba32)]
+    public void TiffEncoder_WithLzwCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel> => TestTiffEncoderCore(provider, TiffBitsPerPixel.Bit24, null, TiffCompression.Lzw, imageDecoder: TiffDecoder.Instance);
+
+    [Theory]
+    [WithFile(Issue2909, PixelTypes.Rgba32)]
+    public void TiffEncoder_WithDeflateCompression_Works<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel> => TestTiffEncoderCore(provider, TiffBitsPerPixel.Bit24, null, TiffCompression.Deflate, imageDecoder: TiffDecoder.Instance);
+
     [Theory]
     [WithFile(GrayscaleUncompressed, PixelTypes.L8, TiffPhotometricInterpretation.BlackIsZero, TiffCompression.PackBits)]
     [WithFile(GrayscaleUncompressed16Bit, PixelTypes.L16, TiffPhotometricInterpretation.BlackIsZero, TiffCompression.PackBits)]

tests/ImageSharp.Tests/TestImages.cs

@@ -1107,6 +1107,8 @@ public static class TestImages
         public const string InvalidIptcData = "Tiff/7324fcaff3aad96f27899da51c1bb5d9.tiff";
         public const string IptcData = "Tiff/iptc.tiff";
 
+        public const string Issue2909 = "Tiff/Issues/Issue2909.tiff";
+
         public static readonly string[] Multiframes = { MultiframeDeflateWithPreview, MultiframeLzwPredictor /*, MultiFrameDifferentSize, MultiframeDifferentSizeTiled, MultiFrameDifferentVariants,*/ };
 
         public static readonly string[] Metadata = { SampleMetadata };

tests/Images/Input/Tiff/Issues/Issue2909.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3c69a7e7c7920766e98fccd273424a34e9094550e2176a7b4757ab2c0756d084
+size 1272