Simplified geometry rendering by using Cairo.Path and caching StreamGeometryContextImpl

src/Gtk/Perspex.Cairo/Media/DrawingContext.cs

@@ -119,35 +119,10 @@ namespace Perspex.Cairo.Media
         public void DrawGeometry(Perspex.Media.Brush brush, Perspex.Media.Pen pen, Perspex.Media.Geometry geometry)
         {
             var impl = geometry.PlatformImpl as StreamGeometryImpl;
-            var clone = new Queue<GeometryOp>(impl.Operations);
       
             using (var pop = this.PushTransform(impl.Transform))
             {
-                while (clone.Count > 0)
-                {
-                    var current = clone.Dequeue();
-
-                    if (current is BeginOp)
-                    {
-                        var bo = current as BeginOp;
-                        this.context.MoveTo(bo.Point.ToCairo());
-                    }
-                    else if (current is LineToOp)
-                    {
-                        var lto = current as LineToOp;
-                        this.context.LineTo(lto.Point.ToCairo());
-                    }
-                    else if (current is EndOp)
-                    {
-                      if (((EndOp)current).IsClosed)
-                            this.context.ClosePath();
-                    }
-                    else if (current is CurveToOp)
-                    {
-                        var cto = current as CurveToOp;
-                        this.context.CurveTo(cto.Point.ToCairo(), cto.Point2.ToCairo(), cto.Point3.ToCairo());
-                    }
-                }
+                this.context.AppendPath(impl.Path);
                 
                 if (brush != null)
                 {

src/Gtk/Perspex.Cairo/Media/StreamGeometryContextImpl.cs

@@ -28,17 +28,17 @@ namespace Perspex.Cairo.Media
 
         public void BeginFigure(Point startPoint, bool isFilled)
         {
-            this.impl.Operations.Enqueue(new BeginOp { Point = startPoint, IsFilled = isFilled });
+            this.context.MoveTo(startPoint.ToCairo());
         }
 
         public void BezierTo(Point point1, Point point2, Point point3)
         {
-            this.impl.Operations.Enqueue(new CurveToOp { Point = point1, Point2 = point2, Point3 = point3 });
+            this.context.CurveTo(point1.ToCairo(), point2.ToCairo(), point3.ToCairo());
         }
 
         public void LineTo(Point point)
         {
-            this.impl.Operations.Enqueue(new LineToOp { Point = point });
+            this.context.LineTo(point.ToCairo());
         }
 
         private Cairo.Context context;
@@ -46,38 +46,12 @@ namespace Perspex.Cairo.Media
 
         public void EndFigure(bool isClosed)
         {
-            this.impl.Operations.Enqueue(new EndOp { IsClosed = isClosed });
-            
-            var clone = new Queue<GeometryOp>(this.impl.Operations);
-            
-            while (clone.Count > 0)
-            {
-                var current = clone.Dequeue();
+            if (isClosed)
+                this.context.ClosePath();
 
-                if (current is BeginOp)
-                {
-                    var bo = current as BeginOp;
-                    context.MoveTo(bo.Point.ToCairo());
-                }
-                else if (current is LineToOp)
-                {
-                    var lto = current as LineToOp;
-                    context.LineTo(lto.Point.ToCairo());
-                }
-                else if (current is EndOp)
-                {
-                    if (((EndOp)current).IsClosed)
-                        context.ClosePath();
-                }
-                else if (current is CurveToOp)
-                {
-                    var cto = current as CurveToOp;
-                    context.CurveTo(cto.Point.ToCairo(), cto.Point2.ToCairo(), cto.Point3.ToCairo());
-                }
-            }
-
-            var extents = context.StrokeExtents();
+            var extents = this.context.StrokeExtents();
             this.impl.Bounds = new Rect(extents.X, extents.Y, extents.Width, extents.Height);
+            this.impl.Path = this.context.CopyPath();
         }
 
         public void Dispose()

src/Gtk/Perspex.Cairo/Media/StreamGeometryImpl.cs

@@ -13,57 +13,23 @@ namespace Perspex.Cairo.Media
     using Splat;
     using System.Collections.Generic;
 
-    public enum CairoGeometryType
-    {
-        Begin,
-        ArcTo,
-        LineTo,
-        End
-    }
-
-    public class BeginOp : GeometryOp
-    {
-        public Point Point { get; set; }
-        public bool IsFilled { get; set; }
-    }
-
-    public class EndOp : GeometryOp
-    {
-        public bool IsClosed { get; set; }
-    }
-
-    public class LineToOp : GeometryOp
-    {
-        public Point Point { get; set; }
-    }
-
-    public class CurveToOp : GeometryOp
-    {
-        public Point Point { get; set; }
-        public Point Point2 { get; set; }
-        public Point Point3 { get; set; }
-    }
-
-    public abstract class GeometryOp
-    {
-    }
-
     public class StreamGeometryImpl : IStreamGeometryImpl
     {
         public StreamGeometryImpl()
         {
-            this.Operations = new Queue<GeometryOp>();
+            this.impl = new StreamGeometryContextImpl(this);
         }
 
-        public StreamGeometryImpl(Queue<GeometryOp> ops)
+        public StreamGeometryImpl(Cairo.Path path)
         {
-            this.Operations = ops;
+            this.impl = new StreamGeometryContextImpl(this);
+            this.Path = path;
         }
-
-        public Queue<GeometryOp> Operations
+        
+        public Cairo.Path Path
         {
             get;
-            private set;
+            set;
         }
 
         public Rect Bounds
@@ -72,7 +38,8 @@ namespace Perspex.Cairo.Media
             set;
         }
 
-        // TODO: Implement
+        private StreamGeometryContextImpl impl;
+
         private Matrix transform = Matrix.Identity;
         public Matrix Transform
         {
@@ -91,7 +58,7 @@ namespace Perspex.Cairo.Media
 
         public IStreamGeometryImpl Clone()
         {
-            return new StreamGeometryImpl(this.Operations);
+            return new StreamGeometryImpl(this.Path);
         }
 
         public Rect GetRenderBounds(double strokeThickness)
@@ -101,7 +68,7 @@ namespace Perspex.Cairo.Media
 
         public IStreamGeometryContextImpl Open()
         {
-            return new StreamGeometryContextImpl(this);
+            return this.impl;
         }
     }
 }