ashatora/openlayers
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Allow to make canvas smaller when it is too big

Browse Source 
For performance reason, we only make the canvas bigger, but not
smaller. With this change, we also make it smaller, but only
when we know that its current size exceeds the maximum
dimensions.
This commit is contained in:
ahocevar
2014-04-02 16:44:57 +02:00
parent 4dce59fe95
commit 58b5fef3da
1 changed files with 12 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/ol/renderer/canvas/canvastilelayerrenderer.js
View File

@@ -44,6 +44,12 @@ ol.renderer.canvas.TileLayer = function(mapRenderer, tileLayer) {
*/
this.canvasSize_ = null;
/**
* @private
* @type {boolean}
*/
this.canvasTooBig_;
/**
* @private
* @type {CanvasRenderingContext2D}
@@ -203,17 +209,21 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
this.canvas_ = context.canvas;
this.canvasSize_ = [canvasWidth, canvasHeight];
this.context_ = context;
this.canvasTooBig_ = !this.testCanvasSize(context, this.canvasSize_);
} else {
goog.asserts.assert(!goog.isNull(this.canvasSize_));
goog.asserts.assert(!goog.isNull(this.context_));
canvas = this.canvas_;
context = this.context_;
if (this.canvasSize_[0] < canvasWidth ||
this.canvasSize_[1] < canvasHeight) {
// Canvas is too small, make it bigger
this.canvasSize_[1] < canvasHeight ||
(this.canvasTooBig_ && (this.canvasSize_[0] > canvasWidth ||
this.canvasSize_[1] > canvasHeight))) {
// Canvas is too small or too big, resize it
canvas.width = canvasWidth;
canvas.height = canvasHeight;
this.canvasSize_ = [canvasWidth, canvasHeight];
this.canvasTooBig_ = !this.testCanvasSize(context, this.canvasSize_);
this.renderedCanvasTileRange_ = null;
} else {
canvasWidth = this.canvasSize_[0];