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Make setting of globalCompositeOperation optional in drawer.js

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This commit is contained in:
Mei-Hui Su 2016-01-19 11:49:04 -08:00
parent a3acaf4b8c
commit efc9098ce4
1 changed files with 4 additions and 1 deletions
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5
src/drawer.js
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@ -370,6 +370,7 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
* @param {Float} [scale=1] The scale at which tiles were drawn on the sketch. Default is 1.
* Use scale to draw at a lower scale and then enlarge onto the main canvas.
* @param OpenSeadragon.Point} [translate] A translation vector that was used to draw the tiles
* @param {String} [options.compositeOperation='source-over'] - How the image is composited onto other images; see compositeOperation in {@link OpenSeadragon.Options} for possible values.
* @returns {undefined}
*/
blendSketch: function(opacity, scale, translate, compositeOperation) {
@ -383,7 +384,9 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
this.context.save();
this.context.globalAlpha = opacity;
this.context.globalCompositeOperation = compositeOperation;
if (compositeOperation !== undefined) {
this.context.globalCompositeOperation = compositeOperation;
}
this.context.drawImage(
this.sketchCanvas,
position.x,