add webp support (#758)

Author: SimonCropp

src/.gitattributes

@@ -4,6 +4,7 @@
 *.pdf binary
 *.png binary
 *.tiff binary
+*.webp binary
 
 *.verified.txt text eol=lf working-tree-encoding=UTF-8
 *.verified.xml text eol=lf working-tree-encoding=UTF-8

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
   <PropertyGroup>
     <NoWarn>CS1591;CS0649;NU1608;NU1109</NoWarn>
-    <Version>3.7.7</Version>
+    <Version>3.8.0</Version>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <ImplicitUsings>enable</ImplicitUsings>
     <LangVersion>preview</LangVersion>

src/Tests/Tests.VerifyWebp.verified.webp

@@ -56,6 +56,10 @@ public Task CompareDifferent()
     public Task VerifyPdf() =>
         VerifyFile("sample.pdf");
 
+    [Test]
+    public Task VerifyWebp() =>
+        VerifyFile("sample.webp");
+
     [Test]
     public Task VerifyPdfWithName() =>
         Verify(targets: [new("pdf", File.OpenRead("sample.pdf"), "name")]);

src/Tests/Tests.cs

@@ -21,6 +21,9 @@ public static void Initialize()
         VerifierSettings.RegisterStreamConverter(
             "png",
             (name, stream, context) => ConvertImage(name, stream, context, "png", MagickFormat.Png));
+        VerifierSettings.RegisterStreamConverter(
+            "webp",
+            (name, stream, context) => ConvertImage(name, stream, context, "webp", MagickFormat.WebP));
         VerifierSettings.RegisterStreamConverter(
             "tiff",
             (name, stream, context) => ConvertImage(name, stream, context, "tiff", MagickFormat.Tiff));
@@ -61,6 +64,7 @@ public static void RegisterComparers(double threshold = .005, ErrorMetric metric
         RegisterComparer(threshold, metric, "jpg");
         RegisterComparer(threshold, metric, "bmp");
         RegisterComparer(threshold, metric, "tiff");
+        RegisterComparer(threshold, metric, "webp");
         VerifierSettings.RegisterStringComparer(
             "svg",
             (received, verified, _) => CompareSvg(threshold, metric, received, verified));
@@ -97,7 +101,7 @@ internal static Task<CompareResult> Compare(double threshold, ErrorMetric metric
     public static void ImageMagickComparer(this VerifySettings settings, double threshold = .005, ErrorMetric metric = ErrorMetric.Fuzz) =>
         settings.UseStreamComparer(
             (received, verified, _) => Compare(threshold, metric, received, verified),
-            extensions: ["png", "jpg", "bmp", "tiff"]);
+            extensions: ["png", "jpg", "bmp", "tiff", "webp"]);
 
     /// <summary>
     /// Helper method that calls <see cref="RegisterPdfToPngConverter"/> and