glitch-canvas.min.js

//! glitch-canvas by snorpey, MIT License
!function(a,b){"function"==typeof define&&define.amd?define(b):"object"==typeof exports?module.exports=b():a.glitch=b()}(this,function(){function a(a,k,l){if(i(a)&&j(k,"parameters","object")&&j(l,"callback","function")){for(n=h(k),b(v,a),b(w,a),o=d(a,n.quality),p=f(o),q=e(p),t=0,u=n.iterations;u>t;t++)c(p,q,n.seed,n.amount,t,n.iterations);r=new Image,r.onload=function(){x.drawImage(r,0,0),s=x.getImageData(0,0,a.width,a.height),l(s)},r.src=g(p)}}function b(a,b){a.width!==b.width&&(a.width=b.width),a.height!==b.height&&(a.height=b.height)}function c(a,b,c,d,e,f){var g=a.length-b-4,h=parseInt(g/f*e,10),i=parseInt(g/f*(e+1),10),j=i-h,k=parseInt(h+j*c,10);k>g&&(k=g);var l=Math.floor(b+k);a[l]=Math.floor(256*d)}function d(a,b){var c="number"==typeof b&&1>b&&b>0?b:.1;y.putImageData(a,0,0);var d=w.toDataURL("image/jpeg",c);switch(d.length%4){case 3:d+="=";break;case 2:d+="==";break;case 1:d+="==="}return d}function e(a){var b=417;for(t=0,u=a.length;u>t;t++)if(255===a[t]&&218===a[t+1]){b=t+2;break}return b}function f(a){var b,c,d,e=[];for(t=23,u=a.length;u>t;t++){switch(c=B[a.charAt(t)],b=(t-23)%4){case 1:e.push(d<<2|c>>4);break;case 2:e.push((15&d)<<4|c>>2);break;case 3:e.push((3&d)<<6|c)}d=c}return e}function g(a){var b,c,d,e=["data:image/jpeg;base64,"];for(t=0,u=a.length;u>t;t++){switch(c=a[t],b=t%3){case 0:e.push(A[c>>2]);break;case 1:e.push(A[(3&d)<<4|c>>4]);break;case 2:e.push(A[(15&d)<<2|c>>6]),e.push(A[63&c])}d=c}return 0===b?(e.push(A[(3&d)<<4]),e.push("==")):1===b&&(e.push(A[(15&d)<<2]),e.push("=")),e.join("")}function h(a){return{seed:(a.seed||0)/100,quality:(a.quality||0)/100,amount:(a.amount||0)/100,iterations:a.iterations||0}}function i(a){return j(a,"image_data","object")&&j(a.width,"image_data.width","number")&&j(a.height,"image_data.height","number")&&j(a.data,"image_data.data","object")&&j(a.data.length,"image_data.data.length","number")&&k(a.data.length,"image_data.data.length",l,"> 0")?!0:!1}function j(a,b,c){return typeof a===c?!0:(m(a,"typeof "+b,'"'+c+'"','"'+typeof a+'"'),!1)}function k(a,b,c,d){return c(a)===!0?!0:(m(a,b,d,"not"),void 0)}function l(a){return a>0}function m(a,b,c,d){throw new Error("glitch(): Expected "+b+" to be "+c+", but it was "+d+".")}var n,o,p,q,r,s,t,u,v=document.createElement("canvas"),w=document.createElement("canvas"),x=v.getContext("2d"),y=w.getContext("2d"),z="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",A=z.split(""),B={};return A.forEach(function(a,b){B[a]=b}),a});