(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : typeof define === 'function' && define.amd ? define(factory) : (global.retinajs = factory());
}(this, (function () { 'use strict';
var hasWindow = typeof window !== 'undefined'; var environment = Math.round(hasWindow ? window.devicePixelRatio || 1 : 1); var srcReplace = /(.[A-z]{3,4}/?(?.*)?)$/; var inlineReplace = /url((‘|“)?(+)('|”)?)/i; var selector = '[data-rjs]'; var processedAttr = 'data-rjs-processed'; function arrayify(object) {
return Array.prototype.slice.call(object);
} function chooseCap(cap) {
var numericCap = parseInt(cap, 10); if (environment < numericCap) { return environment; } else { return numericCap; }
} function forceOriginalDimensions(image) {
if (!image.hasAttribute('data-no-resize')) { if (image.offsetWidth === 0 && image.offsetHeight === 0) { image.setAttribute('width', image.naturalWidth); image.setAttribute('height', image.naturalHeight); } else { image.setAttribute('width', image.offsetWidth); image.setAttribute('height', image.offsetHeight); } } return image;
} function setSourceIfAvailable(image, retinaURL) {
var imgType = image.nodeName.toLowerCase(); var testImage = document.createElement('img'); testImage.addEventListener('load', function () { if (imgType === 'img') { forceOriginalDimensions(image).setAttribute('src', retinaURL); } else { image.style.backgroundImage = 'url(' + retinaURL + ')'; } }); testImage.setAttribute('src', retinaURL); image.setAttribute(processedAttr, true);
} function dynamicSwapImage(image, src) {
var rjs = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1; var cap = chooseCap(rjs); if (src && cap > 1) { var newSrc = src.replace(srcReplace, '@' + cap + 'x$1'); setSourceIfAvailable(image, newSrc); }
} function manualSwapImage(image, src, hdsrc) {
if (environment > 1) { setSourceIfAvailable(image, hdsrc); }
} function getImages(images) {
if (!images) { return typeof document !== 'undefined' ? arrayify(document.querySelectorAll(selector)) : []; } else { return typeof images.forEach === 'function' ? images : arrayify(images); }
} function cleanBgImg(img) {
return img.style.backgroundImage.replace(inlineReplace, '$2');
} function retina(images) {
getImages(images).forEach(function (img) { if (!img.getAttribute(processedAttr)) { var isImg = img.nodeName.toLowerCase() === 'img'; var src = isImg ? img.getAttribute('src') : cleanBgImg(img); var rjs = img.getAttribute('data-rjs'); var rjsIsNumber = !isNaN(parseInt(rjs, 10)); if (rjs === null) { return; } if (rjsIsNumber) { dynamicSwapImage(img, src, rjs); } else { manualSwapImage(img, src, rjs); } } });
} if (hasWindow) {
window.addEventListener('load', function () { retina(); }); window.retinajs = retina;
}
return retina;
}))); //# sourceMappingURL=retina.js.map