From b31db43b1156959390ee810164e1a4a3a3510624 Mon Sep 17 00:00:00 2001
From: Curtis Wensley <curtis.wensley@gmail.com>
Date: Thu, 1 Nov 2018 16:25:55 -0700
Subject: [PATCH 1/2] Optimize filling a region with a solid brush when
 antialias is off

---
 .../Processors/Drawing/FillRegionProcessor.cs | 28 ++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs b/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
index 1dc63efa2..170e3d34f 100644
--- a/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
+++ b/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
@@ -3,7 +3,7 @@
 
 using System;
 using System.Buffers;
-
+using SixLabors.ImageSharp.Advanced;
 using SixLabors.ImageSharp.Memory;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Primitives;
@@ -168,17 +168,31 @@ namespace SixLabors.ImageSharp.Processing.Processors.Drawing
                         {
                             if (!this.Options.Antialias)
                             {
+                                bool hasOnes = false;
+                                bool hasZeros = false;
                                 for (int x = 0; x < scanlineWidth; x++)
                                 {
                                     if (scanline[x] >= 0.5)
                                     {
                                         scanline[x] = 1;
+                                        hasOnes = true;
                                     }
                                     else
                                     {
                                         scanline[x] = 0;
+                                        hasZeros = true;
                                     }
                                 }
+
+                                if (hasOnes != hasZeros && this.IsSolidBrushWithoutBlending(out SolidBrush<TPixel> solidBrush))
+                                {
+                                    if (hasOnes)
+                                    {
+                                        source.GetPixelRowSpan(y).Slice(minX, scanlineWidth).Fill(solidBrush.Color);
+                                    }
+
+                                    continue;
+                                }
                             }
 
                             applicator.Apply(scanline, minX, y);
@@ -187,5 +201,17 @@ namespace SixLabors.ImageSharp.Processing.Processors.Drawing
                 }
             }
         }
+
+        private bool IsSolidBrushWithoutBlending(out SolidBrush<TPixel> solidBrush)
+        {
+            solidBrush = this.Brush as SolidBrush<TPixel>;
+
+            if (solidBrush == null)
+            {
+                return false;
+            }
+
+            return this.Options.IsOpaqueColorWithoutBlending(solidBrush.Color);
+        }
     }
 }
\ No newline at end of file

From 26b2b3d3107a43d361ff50deb79c483331bd910d Mon Sep 17 00:00:00 2001
From: Curtis Wensley <curtis.wensley@gmail.com>
Date: Thu, 15 Nov 2018 08:55:22 -0800
Subject: [PATCH 2/2] Check for solid brush outside of loops

---
 .../Processing/Processors/Drawing/FillRegionProcessor.cs      | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs b/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
index 170e3d34f..550c021ca 100644
--- a/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
+++ b/src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor.cs
@@ -107,6 +107,8 @@ namespace SixLabors.ImageSharp.Processing.Processors.Drawing
                     Span<float> buffer = bBuffer.GetSpan();
                     Span<float> scanline = bScanline.GetSpan();
 
+                    bool isSolidBrushWithoutBlending = this.IsSolidBrushWithoutBlending(out SolidBrush<TPixel> solidBrush);
+
                     for (int y = minY; y < maxY; y++)
                     {
                         if (scanlineDirty)
@@ -184,7 +186,7 @@ namespace SixLabors.ImageSharp.Processing.Processors.Drawing
                                     }
                                 }
 
-                                if (hasOnes != hasZeros && this.IsSolidBrushWithoutBlending(out SolidBrush<TPixel> solidBrush))
+                                if (isSolidBrushWithoutBlending && hasOnes != hasZeros)
                                 {
                                     if (hasOnes)
                                     {