Replace PolygonOffsetter with PolygonStroker from AGG

Author: JimBobSquarePants

ImageSharp.Drawing.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 18
-VisualStudioVersion = 18.0.11123.170 d18.0
+VisualStudioVersion = 18.0.11123.170
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_root", "_root", "{C317F1B1-D75E-4C6D-83EB-80367343E0D7}"
 	ProjectSection(SolutionItems) = preProject
@@ -359,14 +359,6 @@ Global
 		{5493F024-0A3F-420C-AC2D-05B77A36025B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5493F024-0A3F-420C-AC2D-05B77A36025B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5493F024-0A3F-420C-AC2D-05B77A36025B}.Release|Any CPU.Build.0 = Release|Any CPU
-		{FCEDD229-22BC-4B82-87DE-786BBFC52EDE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{FCEDD229-22BC-4B82-87DE-786BBFC52EDE}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{FCEDD229-22BC-4B82-87DE-786BBFC52EDE}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{FCEDD229-22BC-4B82-87DE-786BBFC52EDE}.Release|Any CPU.Build.0 = Release|Any CPU
-		{5490DFAF-0891-535F-08B4-2BF03C2BB778}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{5490DFAF-0891-535F-08B4-2BF03C2BB778}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{5490DFAF-0891-535F-08B4-2BF03C2BB778}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5490DFAF-0891-535F-08B4-2BF03C2BB778}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/ImageSharp.Drawing/Shapes/ClipPathExtensions.cs

@@ -17,7 +17,6 @@ public static class ClipPathExtensions
     /// <param name="subjectPath">The subject path.</param>
     /// <param name="clipPaths">The clipping paths.</param>
     /// <returns>The clipped <see cref="IPath"/>.</returns>
-    /// <exception cref="ClipperException">Thrown when an error occurred while attempting to clip the polygon.</exception>
     public static IPath Clip(this IPath subjectPath, params IPath[] clipPaths)
         => subjectPath.Clip((IEnumerable<IPath>)clipPaths);
 
@@ -28,7 +27,6 @@ public static IPath Clip(this IPath subjectPath, params IPath[] clipPaths)
     /// <param name="options">The shape options.</param>
     /// <param name="clipPaths">The clipping paths.</param>
     /// <returns>The clipped <see cref="IPath"/>.</returns>
-    /// <exception cref="ClipperException">Thrown when an error occurred while attempting to clip the polygon.</exception>
     public static IPath Clip(
         this IPath subjectPath,
         ShapeOptions options,
@@ -41,7 +39,6 @@ public static IPath Clip(
     /// <param name="subjectPath">The subject path.</param>
     /// <param name="clipPaths">The clipping paths.</param>
     /// <returns>The clipped <see cref="IPath"/>.</returns>
-    /// <exception cref="ClipperException">Thrown when an error occurred while attempting to clip the polygon.</exception>
     public static IPath Clip(this IPath subjectPath, IEnumerable<IPath> clipPaths)
         => subjectPath.Clip(new ShapeOptions(), clipPaths);
 
@@ -52,13 +49,12 @@ public static IPath Clip(this IPath subjectPath, IEnumerable<IPath> clipPaths)
     /// <param name="options">The shape options.</param>
     /// <param name="clipPaths">The clipping paths.</param>
     /// <returns>The clipped <see cref="IPath"/>.</returns>
-    /// <exception cref="ClipperException">Thrown when an error occurred while attempting to clip the polygon.</exception>
     public static IPath Clip(
         this IPath subjectPath,
         ShapeOptions options,
         IEnumerable<IPath> clipPaths)
     {
-        Clipper clipper = new(options.IntersectionRule);
+        ClippedShapeGenerator clipper = new(options.IntersectionRule);
 
         clipper.AddPath(subjectPath, ClippingType.Subject);
         clipper.AddPaths(clipPaths, ClippingType.Clip);

src/ImageSharp.Drawing/Shapes/EndCapStyle.cs

@@ -34,9 +34,26 @@ public enum EndCapStyle
     Joined = 4
 }
 
+/// <summary>
+/// Specifies the shape to be used at the ends of open lines or paths when stroking.
+/// </summary>
 internal enum LineCap
 {
+    /// <summary>
+    /// The stroke ends exactly at the endpoint.
+    /// No extension is added beyond the path's end coordinates.
+    /// </summary>
     Butt,
+
+    /// <summary>
+    /// The stroke extends beyond the endpoint by half the line width,
+    /// producing a square edge.
+    /// </summary>
     Square,
+
+    /// <summary>
+    /// The stroke ends with a semicircular cap,
+    /// extending beyond the endpoint by half the line width.
+    /// </summary>
     Round
 }

src/ImageSharp.Drawing/Shapes/IPath.cs

@@ -13,29 +13,29 @@ public interface IPath
     /// <summary>
     /// Gets a value indicating whether this instance is closed, open or a composite path with a mixture of open and closed figures.
     /// </summary>
-    PathTypes PathType { get; }
+    public PathTypes PathType { get; }
 
     /// <summary>
     /// Gets the bounds enclosing the path.
     /// </summary>
-    RectangleF Bounds { get; }
+    public RectangleF Bounds { get; }
 
     /// <summary>
     /// Converts the <see cref="IPath" /> into a simple linear path.
     /// </summary>
     /// <returns>Returns the current <see cref="IPath" /> as simple linear path.</returns>
-    IEnumerable<ISimplePath> Flatten();
+    public IEnumerable<ISimplePath> Flatten();
 
     /// <summary>
     /// Transforms the path using the specified matrix.
     /// </summary>
     /// <param name="matrix">The matrix.</param>
     /// <returns>A new path with the matrix applied to it.</returns>
-    IPath Transform(Matrix3x2 matrix);
+    public IPath Transform(Matrix3x2 matrix);
 
     /// <summary>
     /// Returns this path with all figures closed.
     /// </summary>
     /// <returns>A new close <see cref="IPath"/>.</returns>
-    IPath AsClosedPath();
+    public IPath AsClosedPath();
 }

src/ImageSharp.Drawing/Shapes/JointStyle.cs

@@ -24,19 +24,72 @@ public enum JointStyle
     Miter = 2
 }
 
+/// <summary>
+/// Specifies how the connection between two consecutive line segments (a join)
+/// is rendered when stroking paths or polygons.
+/// </summary>
 internal enum LineJoin
 {
+    /// <summary>
+    /// Joins lines by extending their outer edges until they meet at a sharp corner.
+    /// The miter length is limited by the miter limit; if exceeded, the join may fall back to a bevel.
+    /// </summary>
     MiterJoin = 0,
+
+    /// <summary>
+    /// Joins lines by extending their outer edges to form a miter,
+    /// but if the miter length exceeds the miter limit, the join is truncated
+    /// at the limit distance rather than falling back to a bevel.
+    /// </summary>
     MiterJoinRevert = 1,
+
+    /// <summary>
+    /// Joins lines by connecting them with a circular arc centered at the join point,
+    /// producing a smooth, rounded corner.
+    /// </summary>
     RoundJoin = 2,
+
+    /// <summary>
+    /// Joins lines by connecting the outer corners directly with a straight line,
+    /// forming a flat edge at the join point.
+    /// </summary>
     BevelJoin = 3,
+
+    /// <summary>
+    /// Joins lines by forming a miter, but if the miter limit is exceeded,
+    /// the join falls back to a round join instead of a bevel.
+    /// </summary>
     MiterJoinRound = 4
 }
 
+/// <summary>
+/// Specifies how inner corners of a stroked path or polygon are rendered
+/// when the path turns sharply inward. These settings control how the interior
+/// edge of the stroke is joined at such corners.
+/// </summary>
 internal enum InnerJoin
 {
+    /// <summary>
+    /// Joins inner corners by connecting the edges with a straight line,
+    /// producing a flat, beveled appearance.
+    /// </summary>
     InnerBevel,
+
+    /// <summary>
+    /// Joins inner corners by extending the inner edges until they meet at a sharp point.
+    /// This can create long, narrow joins for acute angles.
+    /// </summary>
     InnerMiter,
+
+    /// <summary>
+    /// Joins inner corners with a notched appearance,
+    /// forming a small cut or indentation at the join.
+    /// </summary>
     InnerJag,
+
+    /// <summary>
+    /// Joins inner corners using a circular arc between the edges,
+    /// creating a smooth, rounded interior transition.
+    /// </summary>
     InnerRound
 }