Use tolerance comparer

Author: JimBobSquarePants

tests/ImageSharp.Drawing.Tests/Processing/Backends/WebGPUDrawingBackendTests.cs

@@ -864,28 +864,36 @@ private static void DebugSaveBackendTriplet<TPixel>(
             $"{testName}_Default",
             appendPixelTypeToFileName: false,
             appendSourceFileOrDescription: false);
+
         cpuRegionImage.DebugSave(
             provider,
             $"{testName}_WebGPU_CPURegion",
             appendPixelTypeToFileName: false,
             appendSourceFileOrDescription: false);
+
         nativeSurfaceImage.DebugSave(
             provider,
             $"{testName}_WebGPU_NativeSurface",
             appendPixelTypeToFileName: false,
             appendSourceFileOrDescription: false);
 
+        ImageComparer tolerantComparer = ImageComparer.TolerantPercentage(0.0003F);
         defaultImage.CompareToReferenceOutput(
+            tolerantComparer,
             provider,
             $"{testName}_Default",
             appendPixelTypeToFileName: false,
             appendSourceFileOrDescription: false);
+
         cpuRegionImage.CompareToReferenceOutput(
+            tolerantComparer,
             provider,
             $"{testName}_WebGPU_CPURegion",
             appendPixelTypeToFileName: false,
             appendSourceFileOrDescription: false);
+
         nativeSurfaceImage.CompareToReferenceOutput(
+            tolerantComparer,
             provider,
             $"{testName}_WebGPU_NativeSurface",
             appendPixelTypeToFileName: false,

tests/ImageSharp.Drawing.Tests/Processing/DrawingCanvasTests.RegionAndState.cs

@@ -3,6 +3,7 @@
 
 using System.Numerics;
 using SixLabors.ImageSharp.Drawing.Processing;
+using SixLabors.ImageSharp.Drawing.Tests.TestUtilities.ImageComparison;
 using SixLabors.ImageSharp.PixelFormats;
 
 namespace SixLabors.ImageSharp.Drawing.Tests.Processing;
@@ -59,7 +60,9 @@ public void SaveRestore_ClipPath_MatchesReference<TPixel>(TestImageProvider<TPix
         canvas.Flush();
 
         target.DebugSave(provider, appendSourceFileOrDescription: false);
-        target.CompareToReferenceOutput(provider, appendSourceFileOrDescription: false);
+
+        ImageComparer tolerantComparer = ImageComparer.TolerantPercentage(0.0003F);
+        target.CompareToReferenceOutput(provider, tolerantComparer, appendSourceFileOrDescription: false);
     }
 
     [Theory]