Avoid casting WebpEncodingMethod

src/ImageSharp/Formats/Webp/Lossless/Vp8LEncoder.cs

@@ -105,7 +105,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
             this.memoryAllocator = memoryAllocator;
             this.configuration = configuration;
             this.quality = Numerics.Clamp(quality, 0, 100);
-            this.method = (WebpEncodingMethod)Numerics.Clamp((int)method, 0, 6);
+            this.method = method;
             this.exact = exact;
             this.nearLossless = nearLossless;
             this.nearLosslessQuality = Numerics.Clamp(nearLosslessQuality, 0, 100);
@@ -1689,7 +1689,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossless
         [MethodImpl(InliningOptions.ShortMethod)]
         private static int GetTransformBits(WebpEncodingMethod method, int histoBits)
         {
-            int maxTransformBits = (int)method < 4 ? 6 : (int)method > 4 ? 4 : 5;
+            int maxTransformBits = (int)method < 4 ? 6 : method > WebpEncodingMethod.Level4 ? 4 : 5;
             int res = histoBits > maxTransformBits ? maxTransformBits : histoBits;
             return res;
         }

src/ImageSharp/Formats/Webp/Lossy/Vp8Encoder.cs

@@ -115,13 +115,13 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
             this.Width = width;
             this.Height = height;
             this.quality = Numerics.Clamp(quality, 0, 100);
-            this.method = (WebpEncodingMethod)Numerics.Clamp((int)method, 0, 6);
+            this.method = method;
             this.entropyPasses = Numerics.Clamp(entropyPasses, 1, 10);
             this.filterStrength = Numerics.Clamp(filterStrength, 0, 100);
             this.spatialNoiseShaping = Numerics.Clamp(spatialNoiseShaping, 0, 100);
             this.rdOptLevel = method is WebpEncodingMethod.BestQuality ? Vp8RdLevel.RdOptTrellisAll
-                : (int)method >= 5 ? Vp8RdLevel.RdOptTrellis
-                : (int)method >= 3 ? Vp8RdLevel.RdOptBasic
+                : method >= WebpEncodingMethod.Level5 ? Vp8RdLevel.RdOptTrellis
+                : method >= WebpEncodingMethod.Level3 ? Vp8RdLevel.RdOptBasic
                 : Vp8RdLevel.RdOptNone;
 
             int pixelCount = width * height;
@@ -371,7 +371,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
             bool doSearch = targetSize > 0 || targetPsnr > 0;
             bool fastProbe = (this.method == 0 || this.method == WebpEncodingMethod.Level3) && !doSearch;
             int numPassLeft = this.entropyPasses;
-            Vp8RdLevel rdOpt = (int)this.method >= 3 || doSearch ? Vp8RdLevel.RdOptBasic : Vp8RdLevel.RdOptNone;
+            Vp8RdLevel rdOpt = this.method >= WebpEncodingMethod.Level3 || doSearch ? Vp8RdLevel.RdOptBasic : Vp8RdLevel.RdOptNone;
             int nbMbs = this.Mbw * this.Mbh;
 
             var stats = new PassStats(targetSize, targetPsnr, QMin, QMax, this.quality);
@@ -799,7 +799,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
 
         private void SetupMatrices(Vp8SegmentInfo[] dqm)
         {
-            int tlambdaScale = (int)this.method >= 4 ? this.spatialNoiseShaping : 0;
+            int tlambdaScale = this.method >= WebpEncodingMethod.Default ? this.spatialNoiseShaping : 0;
             for (int i = 0; i < dqm.Length; i++)
             {
                 Vp8SegmentInfo m = dqm[i];
@@ -870,14 +870,14 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
             it.SetSegment(0);        // default segment, spec-wise.
 
             int bestAlpha;
-            if ((int)this.method <= 1)
+            if (this.method <= WebpEncodingMethod.Level1)
             {
                 bestAlpha = it.FastMbAnalyze(this.quality);
             }
             else
             {
                 bestAlpha = it.MbAnalyzeBestIntra16Mode();
-                if ((int)this.method >= 5)
+                if (this.method >= WebpEncodingMethod.Level5)
                 {
                     // We go and make a fast decision for intra4/intra16.
                     // It's usually not a good and definitive pick, but helps seeding the stats about level bit-cost.
@@ -908,7 +908,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
             if (rdOpt > Vp8RdLevel.RdOptNone)
             {
                 QuantEnc.PickBestIntra16(it, ref rd, this.SegmentInfos, this.Proba);
-                if ((int)this.method >= 2)
+                if (this.method >= WebpEncodingMethod.Level2)
                 {
                     QuantEnc.PickBestIntra4(it, ref rd, this.SegmentInfos, this.Proba, this.maxI4HeaderBits);
                 }
@@ -921,7 +921,7 @@ namespace SixLabors.ImageSharp.Formats.Webp.Lossy
                 // For method >= 2, pick the best intra4/intra16 based on SSE (~tad slower).
                 // For method <= 1, we don't re-examine the decision but just go ahead with
                 // quantization/reconstruction.
-                QuantEnc.RefineUsingDistortion(it, this.SegmentInfos, rd, (int)this.method >= 2, (int)this.method >= 1, this.MbHeaderLimit);
+                QuantEnc.RefineUsingDistortion(it, this.SegmentInfos, rd, this.method >= WebpEncodingMethod.Level2, this.method >= WebpEncodingMethod.Level1, this.MbHeaderLimit);
             }
 
             bool isSkipped = rd.Nz == 0;