Add additional checks

JimBobSquarePants · JimBobSquarePants · commit 8238c8fd6fd3 · 2021-08-04T00:25:22.000+10:00
diff --git a/src/ImageSharp/Processing/Processors/Dithering/ErrorDither.cs b/src/ImageSharp/Processing/Processors/Dithering/ErrorDither.cs
@@ -27,6 +27,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Dithering
         [MethodImpl(InliningOptions.ShortMethod)]
         public ErrorDither(in DenseMatrix<float> matrix, int offset)
         {
+            Guard.MustBeGreaterThan(offset, 0, nameof(offset));
+
             this.matrix = matrix;
             this.offset = offset;
         }
diff --git a/src/ImageSharp/Processing/Processors/Dithering/OrderedDither.cs b/src/ImageSharp/Processing/Processors/Dithering/OrderedDither.cs
@@ -24,6 +24,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Dithering
         [MethodImpl(InliningOptions.ShortMethod)]
         public OrderedDither(uint length)
         {
+            Guard.MustBeGreaterThan(length, 0, nameof(length));
+
             DenseMatrix<uint> ditherMatrix = OrderedDitherFactory.CreateDitherMatrix(length);
 
             // Create a new matrix to run against, that pre-thresholds the values.

Original file line number	Diff line number	Diff line change
`@@ -27,6 +27,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Dithering`
`27`	`27`	`[MethodImpl(InliningOptions.ShortMethod)]`
`28`	`28`	`public ErrorDither(in DenseMatrix<float> matrix, int offset)`
`29`	`29`	`{`
	`30`	`+ Guard.MustBeGreaterThan(offset, 0, nameof(offset));`
	`31`	`+`
`30`	`32`	`this.matrix = matrix;`
`31`	`33`	`this.offset = offset;`
`32`	`34`	`}`
Original file line number	Diff line number	Diff line change
`@@ -24,6 +24,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Dithering`
`24`	`24`	`[MethodImpl(InliningOptions.ShortMethod)]`
`25`	`25`	`public OrderedDither(uint length)`
`26`	`26`	`{`
	`27`	`+ Guard.MustBeGreaterThan(length, 0, nameof(length));`
	`28`	`+`
`27`	`29`	`DenseMatrix<uint> ditherMatrix = OrderedDitherFactory.CreateDitherMatrix(length);`
`28`	`30`
`29`	`31`	`// Create a new matrix to run against, that pre-thresholds the values.`