How would I return the object r as a promise in the following function?
I know that I have to start with promisifying onload, onComplete, toDataUrl
and c; then we see how get fr to return a promise for r but I am not sure
how to go about it.
function fr(f, p) {
var r = {};
var c = function(base64Img) {
var u = f.data;
var d = base64Img;
var diff = resemble(u).compareTo(d).onComplete(function(data){
r.data = data;
r.name = p[i].name;
r.imageUrl = p[i].imageUrl;
r.pageUrl = p[i].pageUrl;
});
diff.scaleToSameSize();
diff.ignoreAntialiasing();
diff.ignoreColors();
$log.debug(r);
};
for(var i = 0; i < 3; i++) {
toDataUrl(p[i], c);
}
// return r as an object once all elements have been collected
}
function toDataUrl(src, callback, outputFormat) {
var img = new Image();
img.crossOrigin = 'Anonymous';
img.onload = function() {
var canvas = document.createElement('CANVAS');
var ctx = canvas.getContext('2d');
var dataURL;
canvas.height = this.height;
canvas.width = this.width;
ctx.drawImage(this, 0, 0);
dataURL = canvas.toDataURL(outputFormat);
callback(dataURL);
};
img.src = src.imageUrl;
if (img.complete || img.complete === undefined) {
img.src =
'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
img.src = src.imageUrl;
}
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