Processed Scott's review comment.

src/ImageSharp.Drawing/Processing/Drawing/Processors/FillProcessor.cs

@@ -55,7 +55,11 @@ namespace SixLabors.ImageSharp.Processing.Drawing.Processors
             var solidBrush = this.brush as SolidBrush<TPixel>;
 
             // If there's no reason for blending, then avoid it.
-            if (solidBrush != null && this.options.BlendPercentage == 1f && solidBrush.Color.ToVector4().W == 1f)
+            if (solidBrush != null &&
+                (
+                    (this.options.BlenderMode == PixelBlenderMode.Normal && this.options.BlendPercentage == 1f && solidBrush.Color.ToVector4().W == 1f) ||
+                    (this.options.BlenderMode == PixelBlenderMode.Over && this.options.BlendPercentage == 1f && solidBrush.Color.ToVector4().W == 1f) ||
+                    (this.options.BlenderMode == PixelBlenderMode.Src)))
             {
                 Parallel.For(
                     minY,

src/ImageSharp/PixelFormats/PixelBlenderMode.cs

@@ -54,62 +54,62 @@ namespace SixLabors.ImageSharp.PixelFormats
         HardLight,
 
         /// <summary>
-        /// returns the source colors
+        /// returns the source colors.
         /// </summary>
         Src,
 
         /// <summary>
-        /// returns the source over the destination
+        /// returns the source over the destination.
         /// </summary>
         Atop,
 
         /// <summary>
-        /// returns the detination over the source
+        /// returns the destination over the source.
         /// </summary>
         Over,
 
         /// <summary>
-        /// the source where the desitnation and source overlap
+        /// The source where the destination and source overlap.
         /// </summary>
         In,
 
         /// <summary>
-        /// the destination where the desitnation and source overlap
+        /// The destination where the destination and source overlap.
         /// </summary>
         Out,
 
         /// <summary>
-        /// the destination where the source does not overlap it
+        /// The destination where the source does not overlap it.
         /// </summary>
         Dest,
 
         /// <summary>
-        /// the source where they dont overlap othersie dest in overlapping parts
+        /// The source where they don't overlap othersie dest in overlapping parts.
         /// </summary>
         DestAtop,
 
         /// <summary>
-        /// the destnation over the source
+        /// The destination over the source.
         /// </summary>
         DestOver,
 
         /// <summary>
-        /// the destination where the desitnation and source overlap
+        /// The destination where the destination and source overlap.
         /// </summary>
         DestIn,
 
         /// <summary>
-        /// the source where the desitnation and source overlap
+        /// The source where the destination and source overlap.
         /// </summary>
         DestOut,
 
         /// <summary>
-        /// the clear.
+        /// The clear.
         /// </summary>
         Clear,
 
         /// <summary>
-        /// clear where they overlap
+        /// Clear where they overlap.
         /// </summary>
         Xor
     }