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simplify the checks on compositeOperation

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This commit is contained in:
Mei-Hui Su 2016-01-20 09:48:15 -08:00
parent 91ecd80a4f
commit 69cce5770c
2 changed files with 2 additions and 2 deletions
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2
src/drawer.js
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@ -384,7 +384,7 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
this.context.save();
this.context.globalAlpha = opacity;
if (compositeOperation !== undefined && compositeOperation !== null) {
if (compositeOperation) {
this.context.globalCompositeOperation = compositeOperation;
}
this.context.drawImage(

2
src/tiledimage.js
View File

@ -1330,7 +1330,7 @@ function drawTiles( tiledImage, lastDrawn ) {
return;
}
var useSketch = tiledImage.opacity < 1 ||
(tiledImage.compositeOperation !== null && tiledImage.compositeOperation !== 'source-over');
(tiledImage.compositeOperation && tiledImage.compositeOperation !== 'source-over');
var sketchScale;
var sketchTranslate;