Moar resize and skew [skip ci]

Somebody help me fix skew please.


Former-commit-id: 4c22456179078f77a0f523a9b4f6eb3af2da42be
Former-commit-id: 3fc9f06730164cffa4d6ca23e43dbd8e81869bf8
Former-commit-id: 357a39fe9c72ae0584e0b05014a6759b2b3af547

src/ImageProcessorCore/Common/Helpers/ImageMaths.cs

@@ -6,6 +6,8 @@
 namespace ImageProcessorCore
 {
     using System;
+    using System.Collections.Generic;
+    using System.Linq;
     using System.Numerics;
 
     /// <summary>
@@ -145,10 +147,10 @@ namespace ImageProcessorCore
             Vector2 leftBottom = Vector2.Transform(new Vector2(rectangle.Left, rectangle.Bottom), matrix);
             Vector2 rightBottom = Vector2.Transform(new Vector2(rectangle.Right, rectangle.Bottom), matrix);
 
-            Vector2 min = Vector2.Min(Vector2.Min(leftTop, rightTop), Vector2.Min(leftBottom, rightBottom));
-            Vector2 max = Vector2.Max(Vector2.Max(leftTop, rightTop), Vector2.Max(leftBottom, rightBottom));
-
-            return new Rectangle(0, 0, (int)(max.X - min.X), (int)(max.Y - min.Y));
+            Vector2[] allCorners = { leftTop, rightTop, leftBottom, rightBottom };
+            float extentX = allCorners.Select(v => v.X).Max() - allCorners.Select(v => v.X).Min();
+            float extentY = allCorners.Select(v => v.Y).Max() - allCorners.Select(v => v.Y).Min();
+            return new Rectangle(0, 0, (int)extentX, (int)extentY);
         }
 
         /// <summary>

src/ImageProcessorCore/Samplers/Rotate.cs

@@ -76,8 +76,7 @@ namespace ImageProcessorCore.Samplers
                 ResizeOptions options = new ResizeOptions
                 {
                     Size = new Size(rectangle.Width, rectangle.Height),
-                    Mode = ResizeMode.BoxPad,
-                    Sampler = new NearestNeighborResampler()
+                    Mode = ResizeMode.BoxPad
                 };
 
                 // Get the padded bounds and resize the image.
@@ -98,8 +97,8 @@ namespace ImageProcessorCore.Samplers
         protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
         {
             int height = this.firstPass.Height;
-            int startX = this.firstPass.Bounds.X;
-            int endX = this.firstPass.Bounds.Right;
+            int startX = 0;
+            int endX = this.firstPass.Width;
             Point centre = this.Center == Point.Empty ? Rectangle.Center(this.firstPass.Bounds) : this.Center;
             Matrix3x2 rotation = Point.CreateRotation(centre, -this.angle);
 

src/ImageProcessorCore/Samplers/Skew.cs

@@ -128,8 +128,8 @@ namespace ImageProcessorCore.Samplers
         protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
         {
             int height = this.firstPass.Height;
-            int startX = this.firstPass.Bounds.X;
-            int endX = this.firstPass.Bounds.Right;
+            int startX = 0;
+            int endX = this.firstPass.Width;
             Point centre = this.Center == Point.Empty ? Rectangle.Center(this.firstPass.Bounds) : this.Center;
             Matrix3x2 skew = Point.CreateSkew(centre, -this.angleX, -this.angleY);
 

tests/ImageProcessorCore.Tests/Processors/Samplers/SamplerTests.cs

@@ -435,7 +435,7 @@
                     using (Image image = new Image(stream))
                     using (FileStream output = File.OpenWrite($"TestOutput/Rotate/{filename}"))
                     {
-                        image.Rotate(45, this.ProgressUpdate)
+                        image.Rotate(63, this.ProgressUpdate)
                              .Save(output);
                     }