Merge pull request SixLabors#1011 from SixLabors/feature/processors

Make processors public, refactor cloning.

Author: JimBobSquarePants

src/ImageSharp.Drawing/Processing/Processors/Drawing/DrawImageProcessor{TPixelBg,TPixelFg}.cs

@@ -91,7 +91,7 @@ protected override void OnFrameApply(ImageFrame<TPixelBg> source)
 
             var workingRect = Rectangle.FromLTRB(minX, minY, maxX, maxY);
 
-            // not a valid operation because rectangle does not overlap with this image.
+            // Not a valid operation because rectangle does not overlap with this image.
             if (workingRect.Width <= 0 || workingRect.Height <= 0)
             {
                 throw new ImageProcessingException(
@@ -102,14 +102,14 @@ protected override void OnFrameApply(ImageFrame<TPixelBg> source)
                 workingRect,
                 configuration,
                 rows =>
+                {
+                    for (int y = rows.Min; y < rows.Max; y++)
                     {
-                        for (int y = rows.Min; y < rows.Max; y++)
-                        {
-                            Span<TPixelBg> background = source.GetPixelRowSpan(y).Slice(minX, width);
-                            Span<TPixelFg> foreground = targetImage.GetPixelRowSpan(y - locationY).Slice(targetX, width);
-                            blender.Blend<TPixelFg>(configuration, background, background, foreground, this.Opacity);
-                        }
-                    });
+                        Span<TPixelBg> background = source.GetPixelRowSpan(y).Slice(minX, width);
+                        Span<TPixelFg> foreground = targetImage.GetPixelRowSpan(y - locationY).Slice(targetX, width);
+                        blender.Blend<TPixelFg>(configuration, background, background, foreground, this.Opacity);
+                    }
+                });
         }
     }
 }

tests/ImageSharp.Tests/Drawing/FillRegionProcessorTests.cs

@@ -41,7 +41,7 @@ public void MinimumAntialiasSubpixelDepth(bool antialias, int antialiasSubpixelD
             };
             var processor = new FillRegionProcessor(brush.Object, region, options);
             var img = new Image<Rgba32>(1, 1);
-            processor.Apply(img, bounds);
+            processor.Execute(img, bounds);
 
             Assert.Equal(4, region.ScanInvocationCounter);
         }
@@ -54,7 +54,7 @@ public void FillOffCanvas()
             var options = new GraphicsOptions(true);
             var processor = new FillRegionProcessor(brush.Object, new MockRegion1(), options);
             var img = new Image<Rgba32>(10, 10);
-            processor.Apply(img, bounds);
+            processor.Execute(img, bounds);
         }
 
         [Fact]