performance improvements...

Runtime/ui/matrix.cs

                 return true;
             }
             else {
-                var points = new[] {
-                    this.mapXY(src.left, src.top),
-                    this.mapXY(src.right, src.top),
-                    this.mapXY(src.right, src.bottom),
-                    this.mapXY(src.left, src.bottom),
-                };
+                float x1, y1, x2, y2, x3, y3, x4, y4;
+                this.mapXY(src.left, src.top, out x1, out y1);
+                this.mapXY(src.right, src.top, out x2, out y2);
+                this.mapXY(src.right, src.bottom, out x3, out y3);
+                this.mapXY(src.left, src.bottom, out x4, out y4);
+
+                var minX = x1;
+                var minY = y1;
+                var maxX = x1;
+                var maxY = y1;
+
+                if (x2 < minX) {
+                    minX = x2;
+                }
+                if (x2 > maxX) {
+                    maxX = x2;
+                }
+                if (y2 < minY) {
+                    minY = y2;
+                }
+                if (y2 > maxY) {
+                    maxY = y2;
+                }
-                var minX = points[0].dx;
-                var minY = points[0].dy;
-                var maxX = points[0].dx;
-                var maxY = points[0].dy;
+                if (x3 < minX) {
+                    minX = x3;
+                }
+                if (x3 > maxX) {
+                    maxX = x3;
+                }
+                if (y3 < minY) {
+                    minY = y3;
+                }
+                if (y3 > maxY) {
+                    maxY = y3;
+                }
-                for (int i = 1; i < 4; ++i) {
-                    minX = Mathf.Min(minX, points[i].dx);
-                    minY = Mathf.Min(minY, points[i].dy);
-                    maxX = Mathf.Max(maxX, points[i].dx);
-                    maxY = Mathf.Max(maxY, points[i].dy);
+                if (x4 < minX) {
+                    minX = x4;
+                }
+                if (x4 > maxX) {
+                    maxX = x4;
+                }
+                if (y4 < minY) {
+                    minY = y4;
+                }
+                if (y4 > maxY) {
+                    maxY = y4;
                 }
 
                 dst = Rect.fromLTRB(minX, minY, maxX, maxY);

Runtime/ui/painting/canvas_clip.cs

             return this._genId;
         }
 
-//        bool _convexContains(float x, float y) {
-//            if (this.mesh.vertices.Count <= 2) {
-//                return false;
-//            }
-//
-//            if (this.mesh.matrix != null) {
-//                if (this._invMat == null) {
-//                    this._invMat = Matrix3.I();
-//                    this.mesh.matrix.invert(this._invMat); // ignore if not invertible for now.
-//                }
-//                
-//                var offset = this._invMat.mapXY(x, y);
-//                x = offset.dx;
-//                y = offset.dy;
-//            }
-//
-//            for (var i = 0; i < this.mesh.vertices.Count; i++) {
-//                var p0 = this.mesh.vertices[i];
-//                var p1 = this.mesh.vertices[i == this.mesh.vertices.Count - 1 ? 0 : i + 1];
-//
-//                if (PathUtils.triarea2(p0.x, p0.y, p1.x, p1.y, x, y) < 0.0f) {
-//                    return false;
-//                }
-//            }
-//
-//            return true;
-//        }
+        bool _convexContains(Rect rect) {
+            if (this.mesh.vertices.Count <= 2) {
+                return false;
+            }
+            
+            for (var i = 0; i < this.mesh.vertices.Count; i++) {
+                var p1 = this.mesh.vertices[i];
+                var p0 = this.mesh.vertices[i == this.mesh.vertices.Count - 1 ? 0 : i + 1];
+                
+                var v = p1 - p0;
+                if (v.x == 0.0 && v.y == 0.0) {
+                    continue;
+                }
+                
+                float yL = v.y * (rect.left - p0.x);
+                float xT = v.x * (rect.top - p0.y);
+                float yR = v.y * (rect.right - p0.x);
+                float xB = v.x * (rect.bottom - p0.y);
+                
+                if ((xT < yL) || (xT < yR) || (xB < yL) || (xB < yR)) {
+                    return false;
+                }
+            }
+
+            return true;
+        }
 
         public bool contains(Rect rect) {
             if (this.isRect) {
-//            this seems to be inefficient. disable it for now.
-//            if (this.convex) {
-//                return this._convexContains(rect.left, rect.top) &&
-//                       this._convexContains(rect.left, rect.bottom) &&
-//                       this._convexContains(rect.right, rect.top) &&
-//                       this._convexContains(rect.right, rect.bottom);
-//            }
+            if (this.convex) {
+                if (this.mesh.matrix != null && !this.mesh.matrix.isIdentity()) {
+                    if (this._invMat == null) {
+                        this._invMat = Matrix3.I();
+                        this.mesh.matrix.invert(this._invMat); // ignore if not invertible for now.
+                    }
+                
+                    rect = this._invMat.mapRect(rect);
+                }
+
+                return this._convexContains(rect);
+            }
 
             return false;
         }

Runtime/ui/painting/path.cs

 
             return totalW != 0;
         }
-
+        
         static int windingLine(float x0, float y0, float x1, float y1, float x, float y) {
             if (y0 == y1) {
                 return 0;
         readonly float _distTol;
         readonly float _tessTol;
 
-        readonly List<PathPath> _paths = new List<PathPath>();
-        readonly List<PathPoint> _points = new List<PathPoint>();
-        readonly List<Vector3> _vertices = new List<Vector3>();
+        readonly ArrayRef<PathPath> _paths = new ArrayRef<PathPath>();
+        readonly ArrayRef<PathPoint> _points = new ArrayRef<PathPoint>();
+        List<Vector3> _vertices = null;
 
         MeshMesh _fillMesh;
         bool _fillConvex;
         }
 
         public void addPath() {
-            this._paths.Add(new PathPath {
-                first = this._points.Count,
+            this._paths.add(new PathPath {
+                first = this._points.length,
                 winding = PathWinding.counterClockwise
             });
         }
         }
 
         void _addPoint(PathPoint point) {
-            if (this._paths.Count == 0) {
+            if (this._paths.length == 0) {
-            ref var path = ref this._paths.refAt(this._paths.Count - 1);
+            ref var path = ref this._paths.array[this._paths.length - 1];
-                ref var pt = ref this._points.refAt(this._points.Count - 1);
+                ref var pt = ref this._points.array[this._points.length - 1];
                 if (PathUtils.ptEquals(pt.x, pt.y, point.x, point.y, this._distTol)) {
                     pt.flags |= point.flags;
                     return;
-            this._points.Add(point);
+            this._points.add(point);
             path.count++;
         }
 
             PointFlags flags) {
             float x1, y1;
-            if (this._points.Count == 0) {
+            if (this._points.length == 0) {
-                ref var pt = ref this._points.refAt(this._points.Count - 1);
+                ref var pt = ref this._points.array[this._points.length - 1];
                 x1 = pt.x;
                 y1 = pt.y;
             }
         }
 
         public void closePath() {
-            if (this._paths.Count == 0) {
+            if (this._paths.length == 0) {
-            ref var path = ref this._paths.refAt(this._paths.Count - 1);
+            ref var path = ref this._paths.array[this._paths.length - 1];
-            if (this._paths.Count == 0) {
+            if (this._paths.length == 0) {
-            ref var path = ref this._paths.refAt(this._paths.Count - 1);
+            ref var path = ref this._paths.array[this._paths.length - 1];
-            var points = this._points.array();
-            var paths = this._paths.array();            
-            for (var j = 0; j < paths.Length; j++) {
-                ref var path = ref paths[j];
+            var points = this._points;
+            var paths = this._paths;            
+            for (var j = 0; j < paths.length; j++) {
+                ref var path = ref paths.array[j];
                 if (path.count <= 1) {
                     continue;
                 }
 
-                ref var p0 = ref points[ip0];
-                ref var p1 = ref points[ip1];
+                ref var p0 = ref points.array[ip0];
+                ref var p1 = ref points.array[ip1];
                 if (PathUtils.ptEquals(p0.x, p0.y, p1.x, p1.y, this._distTol)) {
                     path.count--;
                     path.closed = true;
                     if (path.winding == PathWinding.clockwise) {
-                        PathUtils.polyReverse(this._points, path.first, path.count);
+                        PathUtils.polyReverse(points.array, path.first, path.count);
                     }
                 }
             }
-            var points = this._points.array();
-            var paths = this._paths.array();
-            for (var j = 0; j < paths.Length; j++) {
-                ref var path = ref paths[j];
+            var points = this._points;
+            var paths = this._paths;
+            for (var j = 0; j < paths.length; j++) {
+                ref var path = ref paths.array[j];
                 if (path.count <= 2) {
                     continue;
                 }
                 for (var i = 0; i < path.count; i++) {
-                    ref var p0 = ref points[ip0];
-                    ref var p1 = ref points[ip1];
+                    ref var p0 = ref points.array[ip0];
+                    ref var p1 = ref points.array[ip1];
                     p0.dx = p1.x - p0.x; // no need to normalize
                     p0.dy = p1.y - p0.y;
                     ip0 = ip1++;
                 ip0 = path.first + path.count - 1;
                 ip1 = path.first;
                 for (var i = 0; i < path.count; i++) {
-                    ref var p0 = ref points[ip0];
-                    ref var p1 = ref points[ip1];
+                    ref var p0 = ref points.array[ip0];
+                    ref var p1 = ref points.array[ip1];
 
                     float cross = p1.dx * p0.dy - p0.dx * p1.dy;
                     if (cross < 0.0f) {
                 }
             }
 
-            this._vertices.Clear();
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+
+            var cvertices = 0;
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
+                if (path.count <= 2) {
+                    continue;
+                }
+
+                cvertices += path.count;
+            }
+            
+            this._vertices = new List<Vector3>(cvertices);
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 2) {
                     continue;
                 }
-                    ref var p = ref points[path.first + j];
+                    ref var p = ref points.array[path.first + j];
                     this._vertices.Add(new Vector2(p.x, p.y));
                 }
 
 
             this._expandFill();
 
-            var paths = this._paths.array();
+            var paths = this._paths;
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 2) {
                     continue;
                 }
             }
 
             var indices = new List<int>(cindices);
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 2) {
                     continue;
                 }
             this._fillMesh = mesh;
 
             this._fillConvex = false;
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 2) {
                     continue;
                 }
         void _calculateJoins(float w, StrokeJoin lineJoin, float miterLimit) {
             float iw = w > 0.0f ? 1.0f / w : 0.0f;
 
-            var points = this._points.array();
-            var paths = this._paths.array();
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            var points = this._points;
+            var paths = this._paths;
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 1) {
                     continue;
                 }
 
                 for (var j = 0; j < path.count; j++) {
-                    ref var p0 = ref points[ip0];
-                    ref var p1 = ref points[ip1];
+                    ref var p0 = ref points.array[ip0];
+                    ref var p1 = ref points.array[ip1];
                     p0.dx = p1.x - p0.x;
                     p0.dy = p1.y - p0.y;
                     p0.len = PathUtils.normalize(ref p0.dx, ref p0.dy);
                 ip0 = path.first + path.count - 1;
                 ip1 = path.first;
                 for (var j = 0; j < path.count; j++) {
-                    ref var p0 = ref points[ip0];
-                    ref var p1 = ref points[ip1];
+                    ref var p0 = ref points.array[ip0];
+                    ref var p1 = ref points.array[ip1];
                     float dlx0 = p0.dy;
                     float dly0 = -p0.dx;
                     float dlx1 = p1.dy;
                 ncap = PathUtils.curveDivs(w, Mathf.PI, this._tessTol);
             }
 
-            this._vertices.Clear();
+            var points = this._points;
+            var paths = this._paths;
-            var points = this._points.array();
-            var paths = this._paths.array();
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            var cvertices = 0;
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
+                if (path.count <= 1) {
+                    continue;
+                }
+
+                cvertices += path.count * 2;
+                cvertices += 4;
+            }
+
+            this._vertices = new List<Vector3>(cvertices);
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 1) {
                     continue;
                 }
                     e = path.count - 1;
                 }
 
-                ref var p0 = ref points[ip0];
-                ref var p1 = ref points[ip1];
+                ref var p0 = ref points.array[ip0];
+                ref var p1 = ref points.array[ip1];
 
                 if (!path.closed) {
                     if (lineCap == StrokeCap.butt) {
                 }
 
                 for (var j = s; j < e; j++) {
-                    p0 = ref points[ip0];
-                    p1 = ref points[ip1];
+                    p0 = ref points.array[ip0];
+                    p1 = ref points.array[ip1];
 
                     if ((p1.flags & (PointFlags.bevel | PointFlags.innerBevel)) != 0) {
                         if (lineJoin == StrokeJoin.round) {
                 }
 
                 if (!path.closed) {
-                    p0 = ref points[ip0];
-                    p1 = ref points[ip1];
+                    p0 = ref points.array[ip0];
+                    p1 = ref points.array[ip1];
                     if (lineCap == StrokeCap.butt) {
                         this._vertices.buttCapEnd(p1, p0.dx, p0.dy, w, 0.0f);
                     }
 
             this._expandStroke(strokeWidth, lineCap, lineJoin, miterLimit);
 
-            var paths = this._paths.array();
+            var paths = this._paths;
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 1) {
                     continue;
                 }
             }
 
             var indices = new List<int>(cindices);
-            for (var i = 0; i < paths.Length; i++) {
-                ref var path = ref paths[i];
+            for (var i = 0; i < paths.length; i++) {
+                ref var path = ref paths.array[i];
                 if (path.count <= 1) {
                     continue;
                 }
             return area * 0.5f;
         }
 
-        public static void polyReverse(List<PathPoint> pts, int s, int npts) {
+        public static void polyReverse(PathPoint[] pts, int s, int npts) {
             int i = s, j = s + npts - 1;
             while (i < j) {
                 var tmp = pts[i];

Runtime/ui/painting/tessellation_generator.cs

             public int level;
         }
 
+        static readonly Stack<_StackData> _stack = new Stack<_StackData>();
+
         static List<Vector2> _tessellateBezier(
             float x1, float y1, float x2, float y2,
             float x3, float y3, float x4, float y4,
 
             var points = new List<Vector2>();
 
-            var stack = new Stack<_StackData>();
-            stack.Push(new _StackData {
+            _stack.Clear();
+            _stack.Push(new _StackData {
-            while (stack.Count > 0) {
-                var stackData = stack.Pop();
+            while (_stack.Count > 0) {
+                var stackData = _stack.Pop();
                 x1 = stackData.x1;
                 y1 = stackData.y1;
                 x2 = stackData.x2;
                 float y1234 = (y123 + y234) * 0.5f;
 
                 if (level < 10) {
-                    stack.Push(new _StackData {
+                    _stack.Push(new _StackData {
-                    stack.Push(new _StackData {
+                    _stack.Push(new _StackData {
                         x1 = x1, y1 = y1, x2 = x12, y2 = y12, x3 = x123, y3 = y123, x4 = x1234, y4 = y1234,
                         level = level + 1,
                     });

Runtime/ui/painting/ArrayRef.cs

+using System;
+
+namespace Unity.UIWidgets.ui {
+    public class ArrayRef<T> {
+        public T[] array;
+
+        public int length;
+
+        public ArrayRef() {
+            this.array = Array.Empty<T>();
+            this.length = 0;
+        }
+
+        public void add(T item) {
+            if (this.length == this.array.Length) {
+                int newCapacity = this.array.Length == 0 ? 4 : this.array.Length * 2;
+                Array.Resize(ref this.array, newCapacity);
+            }
+
+            this.array[this.length++] = item;
+        }
+    }
+}

Runtime/ui/painting/ArrayRef.cs.meta

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+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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+  assetBundleVariant: