inset.browser.js

!function(){"use strict";void 0===CanvasRenderingContext2D.prototype.shadowInset&&function(){function t(t){var a=void 0;return n.has(t)?a=n.get(t):(a=document.createElement("canvas"),n.set(t,a)),a}function a(t,a){var e=h[t];h[t]=function(){this.shadowInset===!0?a(this,e,arguments):e.apply(this,arguments)}}function e(t,a,e){var i=a.width+2*e,n=a.height+2*e;(t.width!==i||t.height!==n)&&(t.width!==i&&(t.width=i),t.height!==n&&(t.height=n),t.getContext("2d").translate(e,e))}function i(t,a){["shadowBlur","shadowOffsetX","shadowOffsetY","shadowColor"].forEach(function(e){var i=t[e];t[e]=a[e],a[e]=i})}var n=new WeakMap,h=CanvasRenderingContext2D.prototype,o=h.fillRect,r=h.drawImage,c=["fill","fillRect","drawImage"],d=["beginPath","closePath","moveTo","lineTo","bezierCurveTo","quadraticCurveTo","arc","arcTo","rect"];h.shadowInset=!1,d.forEach(function(i){a(i,function(a,i,n){var h=a.canvas,o=t(h),r=o.getContext("2d");e(o,h,Math.max(h.width,h.height)),i.apply(r,n),i.apply(a,n)})}),c.forEach(function(n){a(n,function(a,n,h){var c=a.canvas,d=t(c),l=d.getContext("2d"),s=Math.max(c.width,c.height);e(d,c,s),n.apply(l,h),l.globalCompositeOperation="xor",l.fillStyle="black",o.apply(l,[-s,-s,d.width,d.height]),i(l,a),r.apply(l,[d,-s,-s]),n.apply(a,h),r.apply(a,[d,s,s,c.width,c.height,0,0,c.width,c.height]),l.clearRect(-s,-s,d.width,d.height),i(l,a)})})}()}();