function getResolutionOfUrl(url, defaultValue) {
    var resolution = _pixi_settings__WEBPACK_IMPORTED_MODULE_0__.settings.RETINA_PREFIX.exec(url);
    if (resolution) {
        return parseFloat(resolution[1]);
    }
    return defaultValue !== undefined ? defaultValue : 1;
}
get the resolution / device pixel ratio of an asset by looking for the prefix
used by spritesheets and image urls
@memberof PIXI.utils
@function getResolutionOfUrl
@param {string} url - the image path
@param {number} [defaultValue=1] - the defaultValue if no filename prefix is set.
@returns {number} resolution / device pixel ratio of an asset