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Performance improvement: only create context when it is needed

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This commit is contained in:
Andreas Hocevar
2017-02-07 16:35:22 +01:00
parent 302087b4ec
commit 7db5eea56b
3 changed files with 37 additions and 22 deletions
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18
src/ol/renderer/canvas/vectortilelayer.js
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@@ -1,6 +1,7 @@
goog.provide('ol.renderer.canvas.VectorTileLayer');
goog.require('ol');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.proj.Units');
@@ -22,6 +23,8 @@ goog.require('ol.transform');
*/
ol.renderer.canvas.VectorTileLayer = function(layer) {
this.context = null;
ol.renderer.canvas.TileLayer.call(this, layer);
/**
@@ -74,9 +77,17 @@ ol.renderer.canvas.VectorTileLayer.VECTOR_REPLAYS = {
* @inheritDoc
*/
ol.renderer.canvas.VectorTileLayer.prototype.prepareFrame = function(frameState, layerState) {
var layerRevision = this.getLayer().getRevision();
var layer = this.getLayer();
var layerRevision = layer.getRevision();
if (this.renderedLayerRevision_ != layerRevision) {
this.renderedTiles.length = 0;
var renderMode = layer.getRenderMode();
if (!this.context && renderMode != ol.layer.VectorTileRenderType.VECTOR) {
this.context = ol.dom.createCanvasContext2D();
}
if (this.context && renderMode == ol.layer.VectorTileRenderType.VECTOR) {
this.context = null;
}
}
this.renderedLayerRevision_ = layerRevision;
return ol.renderer.canvas.TileLayer.prototype.prepareFrame.apply(this, arguments);
@@ -184,11 +195,10 @@ ol.renderer.canvas.VectorTileLayer.prototype.drawTileImage = function(
tile, frameState, layerState, x, y, w, h, gutter) {
var vectorTile = /** @type {ol.VectorTile} */ (tile);
this.createReplayGroup_(vectorTile, frameState);
var layer = this.getLayer();
if (layer.getRenderMode() != ol.layer.VectorTileRenderType.VECTOR) {
if (this.context) {
this.renderTileImage_(vectorTile, frameState, layerState);
ol.renderer.canvas.TileLayer.prototype.drawTileImage.apply(this, arguments);
}
ol.renderer.canvas.TileLayer.prototype.drawTileImage.apply(this, arguments);
};