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Use transparent image from canvas context

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This commit is contained in:
Andreas Hocevar
2017-06-19 10:13:03 +02:00
parent 416df98505
commit 20974fea55
1 changed files with 7 additions and 2 deletions
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9
src/ol/imagetile.js
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@@ -3,6 +3,7 @@ goog.provide('ol.ImageTile');
goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileState');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.EventType');
@@ -150,5 +151,9 @@ ol.ImageTile.prototype.unlistenImage_ = function() {
* A blank image.
* @type {Image}
*/
ol.ImageTile.blankImage = new Image();
ol.ImageTile.blankImage.src = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7';
ol.ImageTile.blankImage = (function() {
var ctx = ol.dom.createCanvasContext2D(1, 1);
ctx.fillStyle = 'rgba(0,0,0,0)';
ctx.fillRect(0, 0, 1, 1);
return ctx.canvas;
})();