Titanium SDK helper to resize

resizeToContainer.js

function resizePhoto(blob, size) {
    var measurement = require('alloy/measurement'), w, h;

    if (blob.width / blob.height >= size.width / size.height) {
        w = measurement.dpToPX(size.width);
        h = blob.height * measurement.dpToPX(size.width) / blob.width;
    } else {
        w = blob.width * measurement.dpToPX(size.height) / blob.height;
        h = measurement.dpToPX(size.height);
    }

    result = blob.imageAsResized(w, h);
    return result;
}