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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,226 @@ | ||
| /*! npm.im/object-fit-images */ | ||
| var objectFitImages = (function () { | ||
| 'use strict'; | ||
|
|
||
| var OFI = 'bfred-it:object-fit-images'; | ||
| var propRegex = /(object-fit|object-position)\s*:\s*([-\w\s%]+)/g; | ||
| var testImg = new Image(); | ||
| var placeholder = document.createElement('canvas'); | ||
| var supportsObjectFit = 'object-fit' in testImg.style; | ||
| var supportsObjectPosition = 'object-position' in testImg.style; | ||
| var supportsOFI = 'background-size' in testImg.style && window.HTMLCanvasElement; | ||
| var supportsCurrentSrc = typeof testImg.currentSrc === 'string'; | ||
| var nativeGetAttribute = testImg.getAttribute; | ||
| var nativeSetAttribute = testImg.setAttribute; | ||
| var autoModeEnabled = false; | ||
|
|
||
| function polyfillCurrentSrc(el) { | ||
| if (el.srcset && !supportsCurrentSrc && window.picturefill) { | ||
| var pf = window.picturefill._; | ||
| // parse srcset with picturefill where currentSrc isn't available | ||
| if (!el[pf.ns] || !el[pf.ns].evaled) { | ||
| // force synchronous srcset parsing | ||
| pf.fillImg(el, {reselect: true}); | ||
| } | ||
|
|
||
| if (!el[pf.ns].curSrc) { | ||
| // force picturefill to parse srcset | ||
| el[pf.ns].supported = false; | ||
| pf.fillImg(el, {reselect: true}); | ||
| } | ||
|
|
||
| // retrieve parsed currentSrc, if any | ||
| el.currentSrc = el[pf.ns].curSrc || el.src; | ||
| } | ||
| } | ||
|
|
||
| function getStyle(el) { | ||
| var style = getComputedStyle(el).fontFamily; | ||
| var parsed; | ||
| var props = {}; | ||
| while ((parsed = propRegex.exec(style)) !== null) { | ||
| props[parsed[1]] = parsed[2]; | ||
| } | ||
| return props; | ||
| } | ||
|
|
||
| function setPlaceholder(img, width, height) { | ||
| placeholder.width = width || 1; | ||
| placeholder.height = height || 1; | ||
| if (img[OFI].width !== placeholder.width || img[OFI].height !== placeholder.height) { | ||
| // cache size to avoid unnecessary changes | ||
| img[OFI].width = placeholder.width; | ||
| img[OFI].height = placeholder.height; | ||
| nativeSetAttribute.call(img, 'src', placeholder.toDataURL()); | ||
| } | ||
| } | ||
|
|
||
| function onImageReady(img, callback) { | ||
| // naturalWidth is only available when the image headers are loaded, | ||
| // this loop will poll it every 100ms. | ||
| if (img.naturalWidth) { | ||
| callback(img); | ||
| } else { | ||
| setTimeout(onImageReady, 100, img, callback); | ||
| } | ||
| } | ||
|
|
||
| function fixOne(el) { | ||
| var style = getStyle(el); | ||
| var ofi = el[OFI]; | ||
| style['object-fit'] = style['object-fit'] || 'fill'; // default value | ||
|
|
||
| // Avoid running where unnecessary, unless OFI had already done its deed | ||
| if (!ofi.img) { | ||
| // fill is the default behavior so no action is necessary | ||
| if (style['object-fit'] === 'fill') { | ||
| return; | ||
| } | ||
|
|
||
| // Where object-fit is supported and object-position isn't (Safari < 10) | ||
| if ( | ||
| !ofi.skipTest && // unless user wants to apply regardless of browser support | ||
| supportsObjectFit && // if browser already supports object-fit | ||
| !style['object-position'] // unless object-position is used | ||
| ) { | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| // keep a clone in memory while resetting the original to a blank | ||
| if (!ofi.img) { | ||
| ofi.img = new Image(el.width, el.height); | ||
| ofi.img.srcset = nativeGetAttribute.call(el, "data-ofi-srcset") || el.srcset; | ||
| ofi.img.src = nativeGetAttribute.call(el, "data-ofi-src") || el.src; | ||
|
|
||
| // preserve for any future cloneNode calls | ||
| // https://github.com/bfred-it/object-fit-images/issues/53 | ||
| nativeSetAttribute.call(el, "data-ofi-src", el.src); | ||
| nativeSetAttribute.call(el, "data-ofi-srcset", el.srcset); | ||
|
|
||
| setPlaceholder(el, el.naturalWidth || el.width, el.naturalHeight || el.height); | ||
|
|
||
| // remove srcset because it overrides src | ||
| if (el.srcset) { | ||
| el.srcset = ''; | ||
| } | ||
| try { | ||
| keepSrcUsable(el); | ||
| } catch (err) { | ||
| if (window.console) { | ||
| console.log('http://bit.ly/ofi-old-browser'); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| polyfillCurrentSrc(ofi.img); | ||
|
|
||
| el.style.backgroundImage = "url(" + ((ofi.img.currentSrc || ofi.img.src).replace('(', '%28').replace(')', '%29')) + ")"; | ||
| el.style.backgroundPosition = style['object-position'] || 'center'; | ||
| el.style.backgroundRepeat = 'no-repeat'; | ||
|
|
||
| if (/scale-down/.test(style['object-fit'])) { | ||
| onImageReady(ofi.img, function () { | ||
| if (ofi.img.naturalWidth > el.width || ofi.img.naturalHeight > el.height) { | ||
| el.style.backgroundSize = 'contain'; | ||
| } else { | ||
| el.style.backgroundSize = 'auto'; | ||
| } | ||
| }); | ||
| } else { | ||
| el.style.backgroundSize = style['object-fit'].replace('none', 'auto').replace('fill', '100% 100%'); | ||
| } | ||
|
|
||
| onImageReady(ofi.img, function (img) { | ||
| setPlaceholder(el, img.naturalWidth, img.naturalHeight); | ||
| }); | ||
| } | ||
|
|
||
| function keepSrcUsable(el) { | ||
| var descriptors = { | ||
| get: function get(prop) { | ||
| return el[OFI].img[prop ? prop : 'src']; | ||
| }, | ||
| set: function set(value, prop) { | ||
| el[OFI].img[prop ? prop : 'src'] = value; | ||
| nativeSetAttribute.call(el, ("data-ofi-" + prop), value); // preserve for any future cloneNode | ||
| fixOne(el); | ||
| return value; | ||
| } | ||
| }; | ||
| Object.defineProperty(el, 'src', descriptors); | ||
| Object.defineProperty(el, 'currentSrc', { | ||
| get: function () { return descriptors.get('currentSrc'); } | ||
| }); | ||
| Object.defineProperty(el, 'srcset', { | ||
| get: function () { return descriptors.get('srcset'); }, | ||
| set: function (ss) { return descriptors.set(ss, 'srcset'); } | ||
| }); | ||
| } | ||
|
|
||
| function hijackAttributes() { | ||
| function getOfiImageMaybe(el, name) { | ||
| return el[OFI] && el[OFI].img && (name === 'src' || name === 'srcset') ? el[OFI].img : el; | ||
| } | ||
| if (!supportsObjectPosition) { | ||
| HTMLImageElement.prototype.getAttribute = function (name) { | ||
| return nativeGetAttribute.call(getOfiImageMaybe(this, name), name); | ||
| }; | ||
|
|
||
| HTMLImageElement.prototype.setAttribute = function (name, value) { | ||
| return nativeSetAttribute.call(getOfiImageMaybe(this, name), name, String(value)); | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| function fix(imgs, opts) { | ||
| var startAutoMode = !autoModeEnabled && !imgs; | ||
| opts = opts || {}; | ||
| imgs = imgs || 'img'; | ||
| if ((supportsObjectPosition && !opts.skipTest) || !supportsOFI) { | ||
| return false; | ||
| } | ||
|
|
||
| // use imgs as a selector or just select all images | ||
| if (typeof imgs === 'string') { | ||
| imgs = document.querySelectorAll(imgs); | ||
| } else if (!('length' in imgs)) { | ||
| imgs = [imgs]; | ||
| } | ||
|
|
||
| // apply fix to all | ||
| for (var i = 0; i < imgs.length; i++) { | ||
| imgs[i][OFI] = imgs[i][OFI] || { | ||
| skipTest: opts.skipTest | ||
| }; | ||
| fixOne(imgs[i]); | ||
| } | ||
|
|
||
| if (startAutoMode) { | ||
| document.body.addEventListener('load', function (e) { | ||
| if (e.target.tagName === 'IMG') { | ||
| fix(e.target, { | ||
| skipTest: opts.skipTest | ||
| }); | ||
| } | ||
| }, true); | ||
| autoModeEnabled = true; | ||
| imgs = 'img'; // reset to a generic selector for watchMQ | ||
| } | ||
|
|
||
| // if requested, watch media queries for object-fit change | ||
| if (opts.watchMQ) { | ||
| window.addEventListener('resize', fix.bind(null, imgs, { | ||
| skipTest: opts.skipTest | ||
| })); | ||
| } | ||
| } | ||
|
|
||
| fix.supportsObjectFit = supportsObjectFit; | ||
| fix.supportsObjectPosition = supportsObjectPosition; | ||
|
|
||
| hijackAttributes(); | ||
|
|
||
| return fix; | ||
|
|
||
| }()); |
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