Merge pull request #7871 from fredj/optim

Memory optimization

src/ol/PluggableMap.js

@@ -1208,15 +1208,18 @@ PluggableMap.prototype.renderFrame_ = function(time) {
       layerStates[getUid(layerStatesArray[i].layer)] = layerStatesArray[i];
     }
     viewState = view.getState();
-    const center = viewState.center;
-    const pixelResolution = viewState.resolution / this.pixelRatio_;
-    center[0] = Math.round(center[0] / pixelResolution) * pixelResolution;
-    center[1] = Math.round(center[1] / pixelResolution) * pixelResolution;
+    let focus = this.focus_;
+    if (!focus) {
+      focus = viewState.center;
+      const pixelResolution = viewState.resolution / this.pixelRatio_;
+      focus[0] = Math.round(focus[0] / pixelResolution) * pixelResolution;
+      focus[1] = Math.round(focus[1] / pixelResolution) * pixelResolution;
+    }
     frameState = /** @type {olx.FrameState} */ ({
       animate: false,
       coordinateToPixelTransform: this.coordinateToPixelTransform_,
       extent: extent,
-      focus: !this.focus_ ? center : this.focus_,
+      focus: focus,
       index: this.frameIndex_++,
       layerStates: layerStates,
       layerStatesArray: layerStatesArray,

src/ol/interaction/DragPan.js

@@ -77,11 +77,10 @@ function handleDragEvent(mapBrowserEvent) {
       const deltaY = centroid[1] - this.lastCentroid[1];
       const map = mapBrowserEvent.map;
       const view = map.getView();
-      const viewState = view.getState();
       let center = [deltaX, deltaY];
-      scaleCoordinate(center, viewState.resolution);
-      rotateCoordinate(center, viewState.rotation);
-      addCoordinate(center, viewState.center);
+      scaleCoordinate(center, view.getResolution());
+      rotateCoordinate(center, view.getRotation());
+      addCoordinate(center, view.getCenter());
       center = view.constrainCenter(center);
       view.setCenter(center);
     }

src/ol/render/Feature.js

@@ -73,15 +73,15 @@ const RenderFeature = function(type, flatCoordinates, ends, properties, id) {
    */
   this.properties_ = properties;
 
-
-  /**
-   * @private
-   * @type {ol.Transform}
-   */
-  this.tmpTransform_ = createTransform();
 };
 
 
+/**
+ * @type {ol.Transform}
+ */
+const tmpTransform = createTransform();
+
+
 /**
  * Get a feature property by its key.
  * @param {string} key Key
@@ -267,12 +267,11 @@ RenderFeature.prototype.transform = function(source, destination) {
   const pixelExtent = source.getExtent();
   const projectedExtent = source.getWorldExtent();
   const scale = getHeight(projectedExtent) / getHeight(pixelExtent);
-  const transform = this.tmpTransform_;
-  composeTransform(transform,
+  composeTransform(tmpTransform,
     projectedExtent[0], projectedExtent[3],
     scale, -scale, 0,
     0, 0);
   transform2D(this.flatCoordinates_, 0, this.flatCoordinates_.length, 2,
-    transform, this.flatCoordinates_);
+    tmpTransform, this.flatCoordinates_);
 };
 export default RenderFeature;