player/js/elements/ImageElement.js

function IImageElement(data, globalData, comp) {
  this.assetData = globalData.getAssetData(data.refId);
  this.initElement(data, globalData, comp);
  this.sourceRect = {top:0, left:0, width:this.assetData.w, height:this.assetData.h};
}

extendPrototype([BaseElement, TransformElement, SVGBaseElement, HierarchyElement, FrameElement, RenderableDOMElement], IImageElement);

IImageElement.prototype.createContent = function () {

  var assetPath = this.globalData.getAssetsPath(this.assetData);

  this.innerElem = createNS('image');
  this.innerElem.setAttribute('width', this.assetData.w+'px');
  this.innerElem.setAttribute('height', this.assetData.h+'px');
  this.innerElem.setAttribute('preserveAspectRatio', this.assetData.pr || this.globalData.renderConfig.imagePreserveAspectRatio);
  this.innerElem.setAttributeNS('http://www.w3.org/1999/xlink', 'href', assetPath);
    
  this.layerElement.appendChild(this.innerElem);
};

IImageElement.prototype.sourceRectAtTime = function () {
  return this.sourceRect;
}