Merge pull request #315 from vlidholt/master

Optimizations for sprite code

packages/flutter/example/game/lib/node.dart

@@ -37,6 +37,7 @@ class Node {
   int _addedOrder;
   int _childrenLastAddedOrder = 0;
   bool _childrenNeedSorting = false;
+  Matrix4 _savedTotalMatrix;
 
   /// Decides if the node and its children is currently paused.
   ///
@@ -64,6 +65,7 @@ class Node {
   ActionController get actions {
     if (_actions == null) {
       _actions = new ActionController();
+      if (_spriteBox != null) _spriteBox._actionControllers = null;
     }
     return _actions;
   }
@@ -200,7 +202,7 @@ class Node {
     child._spriteBox = this._spriteBox;
     _childrenLastAddedOrder += 1;
     child._addedOrder = _childrenLastAddedOrder;
-    if (_spriteBox != null) _spriteBox._eventTargets = null;
+    if (_spriteBox != null) _spriteBox._registerNode(child);
   }
 
   /// Removes a child from this node.
@@ -211,7 +213,7 @@ class Node {
     if (_children.remove(child)) {
       child._parent = null;
       child._spriteBox = null;
-      if (_spriteBox != null) _spriteBox._eventTargets = null;
+      if (_spriteBox != null) _spriteBox._deregisterNode(child);
     }
   }
 
@@ -233,7 +235,7 @@ class Node {
     }
     _children = [];
     _childrenNeedSorting = false;
-    if (_spriteBox != null) _spriteBox._eventTargets = null;
+    if (_spriteBox != null) _spriteBox._deregisterNode(null);
   }
 
   void _sortChildren() {
@@ -414,7 +416,7 @@ class Node {
   }
 
   void _prePaint(PaintingCanvas canvas) {
-    canvas.save();
+    _savedTotalMatrix = canvas.getTotalMatrix();
 
     // Get the transformation matrix and apply transform
     canvas.concat(transformMatrix.storage);
@@ -465,7 +467,7 @@ class Node {
   }
 
   void _postPaint(PaintingCanvas canvas) {
-    canvas.restore();
+    canvas.setMatrix(_savedTotalMatrix);
   }
 
   // Receiving update calls

packages/flutter/example/game/lib/sprite.dart

@@ -29,6 +29,8 @@ class Sprite extends NodeWithSize {
   ///     mySprite.transferMode = TransferMode.plusMode;
   TransferMode transferMode;
 
+  Paint _cachedPaint = new Paint();
+
   /// Creates a new sprite from the provided [texture].
   ///
   ///     var mySprite = new Sprite(myTexture)
@@ -65,7 +67,8 @@ class Sprite extends NodeWithSize {
   }
 
   void paint(PaintingCanvas canvas) {
-    canvas.save();
+    // Store old matrix
+    Matrix4 savedMatrix = canvas.getTotalMatrix();
 
     // Account for pivot point
     applyTransformForPivot(canvas);
@@ -93,22 +96,23 @@ class Sprite extends NodeWithSize {
       canvas.scale(scaleX, scaleY);
 
       // Setup paint object for opacity and transfer mode
-      Paint paint = new Paint();
-      paint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
+      _cachedPaint.color = new Color.fromARGB((255.0*_opacity).toInt(), 255, 255, 255);
       if (colorOverlay != null) {
-        paint.setColorFilter(new ColorFilter.mode(colorOverlay, TransferMode.srcATop));
+        _cachedPaint.setColorFilter(new ColorFilter.mode(colorOverlay, TransferMode.srcATop));
       }
       if (transferMode != null) {
-        paint.setTransferMode(transferMode);
+        _cachedPaint.setTransferMode(transferMode);
       }
 
       // Do actual drawing of the sprite
-      texture.drawTexture(canvas, Point.origin, paint);
+      texture.drawTexture(canvas, Point.origin, _cachedPaint);
     } else {
       // Paint a red square for missing texture
       canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, size.width, size.height),
-      new Paint()..color = const Color.fromARGB(255, 255, 0, 0));
+      new Paint()..color = new Color.fromARGB(255, 255, 0, 0));
     }
-    canvas.restore();
+
+    // Restore matrix
+    canvas.setMatrix(savedMatrix);
   }
 }

packages/flutter/example/game/lib/sprite_box.dart

@@ -71,6 +71,8 @@ class SpriteBox extends RenderBox {
 
   List<Node> _eventTargets;
 
+  List<ActionController> _actionControllers;
+
   Rect _visibleArea;
 
   Rect get visibleArea {
@@ -131,6 +133,18 @@ class SpriteBox extends RenderBox {
     _callSpriteBoxPerformedLayout(_rootNode);
   }
 
+  // Adding and removing nodes
+
+  _registerNode(Node node) {
+    _actionControllers = null;
+    _eventTargets = null;
+  }
+
+  _deregisterNode(Node node) {
+    _actionControllers = null;
+    _eventTargets = null;
+  }
+
   // Event handling
 
   void _addEventTargets(Node node, List<Node> eventTargets) {
@@ -342,19 +356,32 @@ class SpriteBox extends RenderBox {
     // if (_numFrames % 60 == 0)
     //   print("delta: $delta fps: $_frameRate");
 
-    _runActions(_rootNode, delta);
+    _runActions(delta);
     _callUpdate(_rootNode, delta);
+
+    // Schedule next update
     _scheduleTick();
+
+    // Make sure the node graph is redrawn
     markNeedsPaint();
   }
 
-  void _runActions(Node node, double dt) {
-    if (node._actions != null) {
-      node._actions.step(dt);
+  void _runActions(double dt) {
+    if (_actionControllers == null) {
+      _actionControllers = [];
+      _addActionControllers(_rootNode, _actionControllers);
     }
+    for (ActionController actions in _actionControllers) {
+      actions.step(dt);
+    }
+  }
+
+  void _addActionControllers(Node node, List<ActionController> controllers) {
+    if (node._actions != null) controllers.add(node._actions);
+
     for (int i = node.children.length - 1; i >= 0; i--) {
       Node child = node.children[i];
-      _runActions(child, dt);
+      _addActionControllers(child, controllers);
     }
   }