DebugGuard fixes

src/ImageSharp/Formats/Tiff/Compression/Compressors/T4BitCompressor.cs

@@ -215,8 +215,8 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Compression.Compressors
         /// <param name="height">The strip height.</param>
         public override void CompressStrip(Span<byte> pixelsAsGray, int height)
         {
-            DebugGuard.Equals(pixelsAsGray.Length / height, this.Width);
-            DebugGuard.Equals(pixelsAsGray.Length % height, 0);
+            DebugGuard.IsTrue(pixelsAsGray.Length / height == this.Width, "Values must be equals");
+            DebugGuard.IsTrue(pixelsAsGray.Length % height == 0, "Values must be equals");
 
             this.compressedDataBuffer.Clear();
             Span<byte> compressedData = this.compressedDataBuffer.GetSpan();

src/ImageSharp/Formats/Tiff/Compression/HorizontalPredictor.cs

@@ -55,7 +55,7 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Compression
         [MethodImpl(InliningOptions.ShortMethod)]
         private static void ApplyHorizontalPrediction24Bit(Span<byte> rows, int width)
         {
-            DebugGuard.Equals(rows.Length % width, 0);
+            DebugGuard.IsTrue(rows.Length % width == 0, "Values must be equals");
             int height = rows.Length / width;
             for (int y = 0; y < height; y++)
             {
@@ -81,7 +81,7 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Compression
         [MethodImpl(InliningOptions.ShortMethod)]
         private static void ApplyHorizontalPrediction8Bit(Span<byte> rows, int width)
         {
-            DebugGuard.Equals(rows.Length % width, 0);
+            DebugGuard.IsTrue(rows.Length % width == 0, "Values must be equals");
             int height = rows.Length / width;
             for (int y = 0; y < height; y++)
             {

src/ImageSharp/Formats/Tiff/Compression/TiffCompressorFactory.cs

@@ -26,31 +26,31 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Compression
             switch (method)
             {
                 case TiffEncoderCompression.None:
-                    DebugGuard.Equals(compressionLevel, default(DeflateCompressionLevel));
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
+                    DebugGuard.IsTrue(compressionLevel == DeflateCompressionLevel.DefaultCompression, "Values must be equals");
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
 
                     return new NoCompressor(output);
 
                 case TiffEncoderCompression.PackBits:
-                    DebugGuard.Equals(compressionLevel, default(DeflateCompressionLevel));
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
+                    DebugGuard.IsTrue(compressionLevel == DeflateCompressionLevel.DefaultCompression, "Values must be equals");
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
                     return new PackBitsCompressor(output, allocator, width, bitsPerPixel);
 
                 case TiffEncoderCompression.Deflate:
                     return new DeflateCompressor(output, allocator, width, bitsPerPixel, predictor, compressionLevel);
 
                 case TiffEncoderCompression.Lzw:
-                    DebugGuard.Equals(compressionLevel, default(DeflateCompressionLevel));
+                    DebugGuard.IsTrue(compressionLevel == DeflateCompressionLevel.DefaultCompression, "Values must be equals");
                     return new LzwCompressor(output, allocator, width, bitsPerPixel, predictor);
 
                 case TiffEncoderCompression.CcittGroup3Fax:
-                    DebugGuard.Equals(compressionLevel, default(DeflateCompressionLevel));
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
+                    DebugGuard.IsTrue(compressionLevel == DeflateCompressionLevel.DefaultCompression, "Values must be equals");
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
                     return new T4BitCompressor(output, allocator, width, bitsPerPixel, false);
 
                 case TiffEncoderCompression.ModifiedHuffman:
-                    DebugGuard.Equals(compressionLevel, default(DeflateCompressionLevel));
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
+                    DebugGuard.IsTrue(compressionLevel == DeflateCompressionLevel.DefaultCompression, "Values must be equals");
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
                     return new T4BitCompressor(output, allocator, width, bitsPerPixel, true);
 
                 default:

src/ImageSharp/Formats/Tiff/Compression/TiffDecompressorsFactory.cs

@@ -21,31 +21,29 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Compression
             switch (method)
             {
                 case TiffDecoderCompressionType.None:
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
+                    DebugGuard.IsTrue(faxOptions == FaxCompressionOptions.None, "Values must be equals");
                     return new NoneTiffCompression();
 
                 case TiffDecoderCompressionType.PackBits:
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
+                    DebugGuard.IsTrue(faxOptions == FaxCompressionOptions.None, "Values must be equals");
                     return new PackBitsTiffCompression(allocator);
 
                 case TiffDecoderCompressionType.Deflate:
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(faxOptions == FaxCompressionOptions.None, "Values must be equals");
                     return new DeflateTiffCompression(allocator, width, bitsPerPixel, predictor);
 
                 case TiffDecoderCompressionType.Lzw:
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(faxOptions == FaxCompressionOptions.None, "Values must be equals");
                     return new LzwTiffCompression(allocator, width, bitsPerPixel, predictor);
 
                 case TiffDecoderCompressionType.T4:
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
                     return new T4TiffCompression(allocator, faxOptions, photometricInterpretation, width);
 
                 case TiffDecoderCompressionType.HuffmanRle:
-                    DebugGuard.Equals(predictor, TiffPredictor.None);
-                    DebugGuard.Equals(faxOptions, FaxCompressionOptions.None);
+                    DebugGuard.IsTrue(predictor == TiffPredictor.None, "Values must be equals");
                     return new ModifiedHuffmanTiffCompression(allocator, photometricInterpretation, width);
 
                 default:

src/ImageSharp/Formats/Tiff/Writers/TiffBaseColorWriter.cs

@@ -38,7 +38,7 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Writers
 
         public virtual void Write(TiffBaseCompressor compressor, int rowsPerStrip)
         {
-            DebugGuard.Equals(this.BytesPerRow, compressor.BytesPerRow);
+            DebugGuard.IsTrue(this.BytesPerRow == compressor.BytesPerRow || compressor.BytesPerRow == 0, "Values must be equals");
             int stripsCount = (this.Image.Height + rowsPerStrip - 1) / rowsPerStrip;
 
             uint[] stripOffsets = new uint[stripsCount];
@@ -59,7 +59,7 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff.Writers
                 stripIndex++;
             }
 
-            DebugGuard.Equals(stripIndex, stripsCount);
+            DebugGuard.IsTrue(stripIndex == stripsCount, "Values must be equals");
             this.AddStripTags(rowsPerStrip, stripOffsets, stripByteCounts);
         }