/* @license
https://github.com/lydell/resolve-url/blob/master/resolve-url.js
Copyright 2014 Simon Lydell
X11 ("MIT") Licensed. (See LICENSE.) */

/* @license

Extracted from pdf.js
https://github.com/andreasgal/pdf.js

Copyright (c) 2011 Mozilla Foundation

Contributors: Andreas Gal <gal@mozilla.com>
              Chris G Jones <cjones@mozilla.com>
              Shaon Barman <shaon.barman@gmail.com>
              Vivien Nicolas <21@vingtetun.org>
              Justin D'Arcangelo <justindarc@gmail.com>
              Yury Delendik

Modified and adapted in 2017 by Georg Fischer <hi@snorpey.com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE. */

/* 
# @license
#
# MIT LICENSE
# Copyright (c) 2011 Devon Govett, 2017 Georg Fischer <hi@snorpey.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this
# software and associated documentation files (the "Software"), to deal in the Software
# without restriction, including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
# to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or
# substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
# BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t((e="undefined"!=typeof globalThis?globalThis:e||self).png={})}(this,function(e){"use strict";function h(e,t,r){r=r||e.pixels||e.decodePixels();var a,i=e.hasAlphaChannel,n=e.colors,s=null,o=(e.palette.length&&(s=e.decodedPalette||e.decodePalette(),n=4,i=!0),t.data||t),h=o.length,f=s||r,d=0,c=0,u=0;if(1===n)for(;d<h;)u=s?4*r[d/4]:c,a=f[u++],o[d++]=a,o[d++]=a,o[d++]=a,o[d++]=i?f[u++]:255,c=u;else for(;d<h;)u=s?4*r[d/4]:c,o[d++]=f[u++],o[d++]=f[u++],o[d++]=f[u++],o[d++]=i?f[u++]:255,c=u;return t}var n=new Worker(URL.createObjectURL(new Blob(['function loadPNG(t){return fetchData(t).then(function(t){return new PNG(t)})}function fetchData(t){return fetch(t).then(function(t){return t.arrayBuffer()}).then(function(t){return new Uint8Array(t)})}function error(t){throw new Error(t)}var DecodeStream=function(){this.pos=0,this.bufferLength=0,this.eof=!1,this.buffer=null},codeLenCodeMap=(DecodeStream.prototype.ensureBuffer=function(t){var e=this.buffer,r=e?e.byteLength:0;if(t<r)return e;for(var s=512;s<t;)s<<=1;for(var i=new Uint8Array(s),a=0;a<r;++a)i[a]=e[a];return this.buffer=i},DecodeStream.prototype.getBytes=function(t){var e,r=this.pos;if(t){for(this.ensureBuffer(r+t),e=r+t;!this.eof&&this.bufferLength<e;)this.readBlock();t=this.bufferLength;t<e&&(e=t)}else{for(;!this.eof;)this.readBlock();e=this.bufferLength}return this.pos=e,this.buffer.subarray(r,e)},new Uint32Array([16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15])),lengthDecode=new Uint32Array([3,4,5,6,7,8,9,10,65547,65549,65551,65553,131091,131095,131099,131103,196643,196651,196659,196667,262211,262227,262243,262259,327811,327843,327875,327907,258,258,258]),distDecode=new Uint32Array([1,2,3,4,65541,65543,131081,131085,196625,196633,262177,262193,327745,327777,393345,393409,459009,459137,524801,525057,590849,591361,657409,658433,724993,727041,794625,798721,868353,876545]),fixedLitCodeTab=[new Uint32Array([459008,524368,524304,524568,459024,524400,524336,590016,459016,524384,524320,589984,524288,524416,524352,590048,459012,524376,524312,589968,459028,524408,524344,590032,459020,524392,524328,59e4,524296,524424,524360,590064,459010,524372,524308,524572,459026,524404,524340,590024,459018,524388,524324,589992,524292,524420,524356,590056,459014,524380,524316,589976,459030,524412,524348,590040,459022,524396,524332,590008,524300,524428,524364,590072,459009,524370,524306,524570,459025,524402,524338,590020,459017,524386,524322,589988,524290,524418,524354,590052,459013,524378,524314,589972,459029,524410,524346,590036,459021,524394,524330,590004,524298,524426,524362,590068,459011,524374,524310,524574,459027,524406,524342,590028,459019,524390,524326,589996,524294,524422,524358,590060,459015,524382,524318,589980,459031,524414,524350,590044,459023,524398,524334,590012,524302,524430,524366,590076,459008,524369,524305,524569,459024,524401,524337,590018,459016,524385,524321,589986,524289,524417,524353,590050,459012,524377,524313,589970,459028,524409,524345,590034,459020,524393,524329,590002,524297,524425,524361,590066,459010,524373,524309,524573,459026,524405,524341,590026,459018,524389,524325,589994,524293,524421,524357,590058,459014,524381,524317,589978,459030,524413,524349,590042,459022,524397,524333,590010,524301,524429,524365,590074,459009,524371,524307,524571,459025,524403,524339,590022,459017,524387,524323,589990,524291,524419,524355,590054,459013,524379,524315,589974,459029,524411,524347,590038,459021,524395,524331,590006,524299,524427,524363,590070,459011,524375,524311,524575,459027,524407,524343,590030,459019,524391,524327,589998,524295,524423,524359,590062,459015,524383,524319,589982,459031,524415,524351,590046,459023,524399,524335,590014,524303,524431,524367,590078,459008,524368,524304,524568,459024,524400,524336,590017,459016,524384,524320,589985,524288,524416,524352,590049,459012,524376,524312,589969,459028,524408,524344,590033,459020,524392,524328,590001,524296,524424,524360,590065,459010,524372,524308,524572,459026,524404,524340,590025,459018,524388,524324,589993,524292,524420,524356,590057,459014,524380,524316,589977,459030,524412,524348,590041,459022,524396,524332,590009,524300,524428,524364,590073,459009,524370,524306,524570,459025,524402,524338,590021,459017,524386,524322,589989,524290,524418,524354,590053,459013,524378,524314,589973,459029,524410,524346,590037,459021,524394,524330,590005,524298,524426,524362,590069,459011,524374,524310,524574,459027,524406,524342,590029,459019,524390,524326,589997,524294,524422,524358,590061,459015,524382,524318,589981,459031,524414,524350,590045,459023,524398,524334,590013,524302,524430,524366,590077,459008,524369,524305,524569,459024,524401,524337,590019,459016,524385,524321,589987,524289,524417,524353,590051,459012,524377,524313,589971,459028,524409,524345,590035,459020,524393,524329,590003,524297,524425,524361,590067,459010,524373,524309,524573,459026,524405,524341,590027,459018,524389,524325,589995,524293,524421,524357,590059,459014,524381,524317,589979,459030,524413,524349,590043,459022,524397,524333,590011,524301,524429,524365,590075,459009,524371,524307,524571,459025,524403,524339,590023,459017,524387,524323,589991,524291,524419,524355,590055,459013,524379,524315,589975,459029,524411,524347,590039,459021,524395,524331,590007,524299,524427,524363,590071,459011,524375,524311,524575,459027,524407,524343,590031,459019,524391,524327,589999,524295,524423,524359,590063,459015,524383,524319,589983,459031,524415,524351,590047,459023,524399,524335,590015,524303,524431,524367,590079]),9],fixedDistCodeTab=[new Uint32Array([327680,327696,327688,327704,327684,327700,327692,327708,327682,327698,327690,327706,327686,327702,327694,0,327681,327697,327689,327705,327685,327701,327693,327709,327683,327699,327691,327707,327687,327703,327695,0]),5],FlateStream=function(s){function t(t){s.call(this);var e=0,r=t[e++],e=t[+e];-1!=r&&-1!=e||error("Invalid header in flate stream"),8!=(15&r)&&error("Unknown compression method in flate stream"),((r<<8)+e)%31!=0&&error("Bad FCHECK in flate stream"),32&e&&error("FDICT bit set in flate stream"),this.pos=0,this.bufferLength=0,this.eof=!1,this.buffer=null,this.bytes=t,this.bytesPos=2,this.codeSize=0,this.codeBuf=0}return s&&(t.__proto__=s),((t.prototype=Object.create(s&&s.prototype)).constructor=t).prototype.getBits=function(t){for(var e,r=this.codeSize,s=this.codeBuf,i=this.bytesPos,a=this.bytes;r<t;)void 0===(e=a[i++])&&error("Bad encoding in flate stream"),s|=e<<r,r+=8;return e=s&(1<<t)-1,this.codeBuf=s>>t,this.codeSize=r-=t,this.bytesPos=i,e},t.prototype.getCode=function(t){for(var e=t[0],r=t[1],s=this.bytes,i=this.codeSize,a=this.codeBuf,n=this.bytesPos;i<r;){var o;void 0===(o=s[n++])&&error("Bad encoding in flate stream"),a|=o<<i,i+=8}t=e[a&(1<<r)-1],e=t>>16,t&=65535;return(0==i||i<e||0==e)&&error("Bad encoding in flate stream"),this.codeBuf=a>>e,this.codeSize=i-e,this.bytesPos=n,t},t.prototype.generateHuffmanTable=function(t){for(var e=t.length,r=0,s=0;s<e;++s)t[s]>r&&(r=t[s]);for(var i=1<<r,a=new Uint32Array(i),n=1,o=0,h=2;n<=r;++n,o<<=1,h<<=1)for(var f=0;f<e;++f)if(t[f]==n){for(var d=0,c=o,l=0;l<n;++l)d=d<<1|1&c,c>>=1;for(l=d;l<i;l+=h)a[l]=n<<16|f;++o}return[a,r]},t.prototype.readBlock=function(){var n=0;function t(t,e,r,s,i){for(var a=t.getBits(r)+s;0<a--;)e[n++]=i}var e,r,s=this.getBits(3);if(1&s&&(this.eof=!0),0==(s>>=1)){var i,a=this.bytes,o=this.bytesPos,h=(void 0===(i=a[o++])&&error("Bad block header in flate stream"),i),f=(void 0===(i=a[o++])&&error("Bad block header in flate stream"),h|=i<<8,void 0===(i=a[o++])&&error("Bad block header in flate stream"),i),f=(void 0===(i=a[o++])&&error("Bad block header in flate stream"),(f|=i<<8)!=(65535&~h)&&error("Bad uncompressed block length in flate stream"),this.codeBuf=0,this.codeSize=0,this.bufferLength),d=this.ensureBuffer(f+h),c=f+h;this.bufferLength=c;for(var l=f;l<c;++l){if(void 0===(i=a[o++])){this.eof=!0;break}d[l]=i}this.bytesPos=o}else{if(1==s)e=fixedLitCodeTab,r=fixedDistCodeTab;else if(2==s){for(var h=this.getBits(5)+257,f=this.getBits(5)+1,u=this.getBits(4)+4,p=Array(codeLenCodeMap.length),n=0;n<u;)p[codeLenCodeMap[n++]]=this.getBits(3);var g=this.generateHuffmanTable(p),m=0,y=h+f,b=new Array(y);for(n=0;n<y;){var v=this.getCode(g);16==v?t(this,b,2,3,m):17==v?t(this,b,3,3,m=0):18==v?t(this,b,7,11,m=0):b[n++]=m=v}e=this.generateHuffmanTable(b.slice(0,h)),r=this.generateHuffmanTable(b.slice(h,y))}else error("Unknown block type in flate stream");for(var B=this.buffer,U=B?B.length:0,w=this.bufferLength;;)if((D=this.getCode(e))<256)U<=w+1&&(U=(B=this.ensureBuffer(w+1)).length),B[w++]=D;else{if(256==D)return void(this.bufferLength=w);var D,P=(D=lengthDecode[D-=257])>>16,k=(65535&D)+(P=0<P?this.getBits(P):P),I=(D=this.getCode(r),(65535&(D=distDecode[D]))+(P=0<(P=D>>16)?this.getBits(P):P));U<=w+k&&(U=(B=this.ensureBuffer(w+k)).length);for(var C=0;C<k;++C,++w)B[w]=B[w-I]}}},t}(DecodeStream),PNG=function(t){this.data=t,this.pos=8,this.palette=[],this.imgData=[],this.transparency={},this.animation=null,this.text={};for(var e=null;;){var r=this.readUInt32(),s=function(){for(var t=[],e=0;e<4;++e)t.push(String.fromCharCode(this.data[this.pos++]));return t}.call(this).join("");switch(s){case"IHDR":this.width=this.readUInt32(),this.height=this.readUInt32(),this.bits=this.data[this.pos++],this.colorType=this.data[this.pos++],this.compressionMethod=this.data[this.pos++],this.filterMethod=this.data[this.pos++],this.interlaceMethod=this.data[this.pos++];break;case"acTL":this.animation={numFrames:this.readUInt32(),numPlays:this.readUInt32()||1/0,frames:[]};break;case"PLTE":this.palette=this.read(r);break;case"fcTL":e&&this.animation.frames.push(e),this.pos+=4;var e={width:this.readUInt32(),height:this.readUInt32(),xOffset:this.readUInt32(),yOffset:this.readUInt32()},i=this.readUInt16(),a=this.readUInt16()||100;e.delay=1e3*i/a,e.disposeOp=this.data[this.pos++],e.blendOp=this.data[this.pos++],e.data=[];break;case"IDAT":case"fdAT":"fdAT"===s&&(this.pos+=4,r-=4),t=(null!=e?e.data:void 0)||this.imgData;for(var n=void 0,n=0;0<=r?n<r:r<n;0<=r?++n:--n)t.push(this.data[this.pos++]);break;case"tRNS":switch(this.transparency={},this.colorType){case 3:this.transparency.indexed=this.read(r);var o=255-this.transparency.indexed.length;if(0<o)for(var h=void 0,h=0;0<=o?h<o:o<h;0<=o?++h:--h)this.transparency.indexed.push(255);break;case 0:this.transparency.grayscale=this.read(r)[0];break;case 2:this.transparency.rgb=this.read(r)}break;case"tEXt":var i=this.read(r),a=i.indexOf(0),f=String.fromCharCode.apply(String,i.slice(0,a));this.text[f]=String.fromCharCode.apply(String,i.slice(a+1));break;case"IEND":e&&this.animation.frames.push(e),this.colors=function(){switch(this.colorType){case 0:case 3:case 4:return 1;case 2:case 6:return 3}}.call(this),this.hasAlphaChannel=4===this.colorType||6===this.colorType;f=this.colors+(this.hasAlphaChannel?1:0);return this.pixelBitlength=this.bits*f,this.colorSpace=function(){switch(this.colors){case 1:return"DeviceGray";case 3:return"DeviceRGB"}}.call(this),void(this.imgData=new Uint8Array(this.imgData));default:this.pos+=r}this.pos+=4,this.pos>this.data.length&&error("Incomplete or corrupt PNG file")}};function sendMessage(t,e,r){t={type:t,message:e,id:r,time:Date.now()};self.postMessage(t)}function fromURL(t){return loadPNG(t)}function fromImageData(r){return new Promise(function(t,e){try{t(new PNG(r.data||r))}catch(t){e(t)}})}PNG.prototype.read=function(t){for(var e=[],r=0;0<=t?r<t:t<r;0<=t?++r:--r)e.push(this.data[this.pos++]);return e},PNG.prototype.readUInt32=function(){return this.data[this.pos++]<<24|this.data[this.pos++]<<16|this.data[this.pos++]<<8|this.data[this.pos++]},PNG.prototype.readUInt16=function(){return this.data[this.pos++]<<8|this.data[this.pos++]},PNG.prototype.decodePixels=function(t){if(0===(t=null==t?this.imgData:t).length)return new Uint8Array(0);t=new FlateStream(t).getBytes();for(var e,r,s,i,a,n=this.pixelBitlength/8,o=n*this.width,h=new Uint8Array(o*this.height),f=t.length,d=0,c=0,l=0,u=0,p=0,g=0,m=0,y=0,b=0;c<f;){switch(t[c++]){case 0:for(u=p=0;p<o;u=p+=1)h[l++]=t[c++];break;case 1:for(u=g=0;g<o;u=g+=1)e=t[c++],s=u<n?0:h[l-n],h[l++]=(e+s)%256;break;case 2:for(u=m=0;m<o;u=m+=1)e=t[c++],r=(u-u%n)/n,i=d&&h[(d-1)*o+r*n+u%n],h[l++]=(i+e)%256;break;case 3:for(u=y=0;y<o;u=y+=1)e=t[c++],r=(u-u%n)/n,s=u<n?0:h[l-n],i=d&&h[(d-1)*o+r*n+u%n],h[l++]=(e+Math.floor((s+i)/2))%256;break;case 4:for(u=b=0;b<o;u=b+=1){e=t[c++],r=(u-u%n)/n,s=u<n?0:h[l-n],0===d?i=a=0:(i=h[(d-1)*o+r*n+u%n],a=r&&h[(d-1)*o+(r-1)*n+u%n]);var v=s+i-a,B=Math.abs(v-s),U=Math.abs(v-i),v=Math.abs(v-a),B=B<=U&&B<=v?s:U<=v?i:a;h[l++]=(e+B)%256}break;default:error("Invalid filter algorithm: "+t[c-1])}d++}return h},PNG.prototype.decodePalette=function(){for(var t,e,r=this.palette,s=this.transparency.indexed||[],i=new Uint8Array((s.length||0)+r.length),a=(r.length,0),n=0,o=t=0,h=r.length;t<h;o=t+=3)i[a++]=r[o],i[a++]=r[o+1],i[a++]=r[o+2],i[a++]=null!=(e=s[n++])?e:255;return i},PNG.prototype.decodeFrames=function(){if(this.animation){for(var t=this.animation.frames.length,e=[],r=0;r<t;++r){var s=this.animation.frames[r];e[r]=this.decodePixels(new Uint8Array(s.data))}return e}},self.addEventListener("message",function(t){var t=t.data,e=t.id;"fromURL"===t.type&&t.message&&fromURL(t.message).then(function(r){r.pixels=r.decodePixels(),r.decodedPalette=r.decodePalette(),r.animation&&r.decodeFrames().forEach(function(t,e){r.animation.frames[e].decoded=t}),sendMessage("fromUrl",r,e)},function(t){sendMessage("error",t.message||t,e)}),"fromImageData"===t.type&&t.message&&fromImageData(t.message).then(function(t){sendMessage("fromImageData",t,e)},function(t){sendMessage("error",t.message||t,e)})});'],{type:"0"})));function t(e,t){return new Promise(function(r,a){var i=~~(Date.now()*Math.random()*1e4);n.addEventListener("message",function e(t){t=t.data;t&&t.id===i&&(n.removeEventListener("message",e),("error"===t.type?a:r)(t.message))}),n.postMessage({type:e,message:t,id:i,time:Date.now()})})}function i(e,t){var r;return(t=void 0===t?null:t)||((r=document.createElement("canvas")).width=e.width,r.height=e.height,t=r.getContext("2d")),h(e,t.createImageData(e.width,e.height))}function s(e,t,r,a){void 0===r&&(r=0),void 0===a&&(a=0);e=i(e,t);return t.putImageData(e,r,a)}function o(e,t,r){if(e.animation)return e.animation.currentFrameIndex=0,e.animation.currentPlayCount=0,function(r){for(var e=document.createElement("canvas"),t=e.getContext("2d"),a=[],i=0;i<r.animation.frames.length;++i)a[i]=function(i,n,s,o){return new Promise(function(e,t){var r=new Image,t=(r.addEventListener("load",function(){e(r)}),r.addEventListener("error",t),i.animation.frames[n].decoded),a=o.createImageData(i.width,i.height),a=h(i,a,t);o.width=i.width,o.height=i.height,o.clearRect(0,0,i.width,i.height),o.putImageData(a,0,0),r.src=s.toDataURL()})}(r,i,e,t);return Promise.all(a).then(function(e){return e.forEach(function(e,t){r.animation.frames[t].image=e}),r})}(e).then(function(){!function e(t,r,a){var i=!0;t.animation.currentFrameIndex<t.animation.frames.length-1?t.animation.currentFrameIndex++:(t.animation.currentPlayCount++,t.animation.currentPlayCount>=t.animation.numPlays?i=!1:t.animation.currentFrameIndex=0);i?(i=t.animation.frames[t.animation.currentFrameIndex].delay||1e3/60,l(t,a,t.animation.currentFrameIndex),r.timeoutId=setTimeout(function(){e(t,r,a)},i)):f(r)}(e,t,r)});throw new Error("Cannot animate png: no animation data available")}function f(e){clearTimeout(e.timeoutId)}var d=1,c=2,u=0;function l(e,t,r){var a=e.animation.frames,i=a[r],a=a[0===r?a.length-1:r-1];return 0===r&&t.clearRect(0,0,e.width,e.height),null!=a.disposeOp&&a.disposeOp===d?t.clearRect(a.xOffset,a.yOffset,a.width,a.height):null!=a.disposeOp&&a.disposeOp===c&&t.putImageData(a.imageData,a.xOffset,a.yOffset),(null!=a?a.disposeOp:void 0)===d?t.clearRect(a.xOffset,a.yOffset,a.width,a.height):(null!=a?a.disposeOp:void 0)===c&&t.putImageData(a.imageData,a.xOffset,a.yOffset),i.blendOp===u&&t.clearRect(i.xOffset,i.yOffset,i.width,i.height),t.drawImage(i.image,i.xOffset,i.yOffset)}e.animateOnContext=o,e.fromImageData=function(e){return t("fromImageData",e)},e.fromURL=function(e){return t("fromURL",function(e){var t=arguments,r=arguments.length;if(0===r)throw new Error("resolveUrl requires at least one argument; got none.");var a=document.createElement("base");if(a.href=e,1===r)return a.href;for(var i,e=document.getElementsByTagName("head")[0],n=(e.insertBefore(a,e.firstChild),document.createElement("a")),s=1;s<r;s++)n.href=t[s],i=n.href,a.href=i;return e.removeChild(a),i}(e))},e.renderAnimationFrame=l,e.renderToCanvas=function(e,t,r,a){void 0===r&&(r=!1),void 0===a&&(a=!1);var i=t.getContext("2d");if(f(t),r&&(t.width=e.width,t.height=e.height),!e.animation||a)return s(e,i);o(e,t,i)},e.renderToContext=s,e.toImageData=i,Object.defineProperty(e,"__esModule",{value:!0})});