diff --git a/README.md b/README.md
index b27dc5b..ce66235 100644
--- a/README.md
+++ b/README.md
@@ -67,10 +67,25 @@ worker.onmessage = function(e) {
 }
 ```
 
+**PNG Support**
+```
+worker.postMessage({
+  image: imageData,
+  png: true,
+  quality: 50
+});
+worker.onmessage = function(e) {
+  // Make sure to specify the type as png.
+  var blob = new Blob( [e.data.data], {type: 'image/png'} );
+}
+```
+
 ## Credits
 
 This library relies almost entirely on an adaptation of the encoder from the [jpeg-js]() library. This library was built to work in a node.js environment and not in the browser, let alone in a web worker environment.
 
+The png part of this library is pulled directly from https://github.com/photopea/UPNG.js
+
 
 ## License
 
diff --git a/index.js b/index.js
index 2c10a50..2a3af53 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,9 @@
 this.onmessage = function(e) {
-  this.postMessage(encode(e.data.image, e.data.quality));
+  if (e.data.png) {
+    this.postMessage(UPNG.encode([e.data.buffer], e.width, e.height, 0));
+  } else {
+    this.postMessage(encode(e.data.image, e.data.quality));
+  }
 };
 
 /*
@@ -752,3 +756,682 @@ function getImageDataFromImage(idOrElement){
 
   return (ctx.getImageData(0, 0, cvs.width, cvs.height));
 }
+
+
+
+
+// PNG SUPPORT
+
+!function(t){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=t();else if("function"==typeof define&&define.amd)define([],t);else{("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).pako=t()}}(function(){return function r(s,o,l){function h(e,t){if(!o[e]){if(!s[e]){var a="function"==typeof require&&require;if(!t&&a)return a(e,!0);if(d)return d(e,!0);var i=new Error("Cannot find module '"+e+"'");throw i.code="MODULE_NOT_FOUND",i}var n=o[e]={exports:{}};s[e][0].call(n.exports,function(t){return h(s[e][1][t]||t)},n,n.exports,r,s,o,l)}return o[e].exports}for(var d="function"==typeof require&&require,t=0;t<l.length;t++)h(l[t]);return h}({1:[function(t,e,a){"use strict";var s=t("./zlib/deflate"),o=t("./utils/common"),l=t("./utils/strings"),n=t("./zlib/messages"),r=t("./zlib/zstream"),h=Object.prototype.toString,d=0,f=-1,_=0,u=8;function c(t){if(!(this instanceof c))return new 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P(){this.strm=null,this.status=0,this.pending_buf=null,this.pending_buf_size=0,this.pending_out=0,this.pending=0,this.wrap=0,this.gzhead=null,this.gzindex=0,this.method=p,this.last_flush=-1,this.w_size=0,this.w_bits=0,this.w_mask=0,this.window=null,this.window_size=0,this.prev=null,this.head=null,this.ins_h=0,this.hash_size=0,this.hash_bits=0,this.hash_mask=0,this.hash_shift=0,this.block_start=0,this.match_length=0,this.prev_match=0,this.match_available=0,this.strstart=0,this.match_start=0,this.lookahead=0,this.prev_length=0,this.max_chain_length=0,this.max_lazy_match=0,this.level=0,this.strategy=0,this.good_match=0,this.nice_match=0,this.dyn_ltree=new _.Buf16(2*k),this.dyn_dtree=new _.Buf16(2*(2*s+1)),this.bl_tree=new _.Buf16(2*(2*o+1)),D(this.dyn_ltree),D(this.dyn_dtree),D(this.bl_tree),this.l_desc=null,this.d_desc=null,this.bl_desc=null,this.bl_count=new _.Buf16(y+1),this.heap=new _.Buf16(2*r+1),D(this.heap),this.heap_len=0,this.heap_max=0,this.depth=new _.Buf16(2*r+1),D(this.depth),this.l_buf=0,this.lit_bufsize=0,this.last_lit=0,this.d_buf=0,this.opt_len=0,this.static_len=0,this.matches=0,this.insert=0,this.bi_buf=0,this.bi_valid=0}function Y(t){var e;return t&&t.state?(t.total_in=t.total_out=0,t.data_type=n,(e=t.state).pending=0,e.pending_out=0,e.wrap<0&&(e.wrap=-e.wrap),e.status=e.wrap?S:E,t.adler=2===e.wrap?0:1,e.last_flush=d,h._tr_init(e),b):N(t,g)}function q(t){var e,a=Y(t);return a===b&&((e=t.state).window_size=2*e.w_size,D(e.head),e.max_lazy_match=l[e.level].max_lazy,e.good_match=l[e.level].good_length,e.nice_match=l[e.level].nice_length,e.max_chain_length=l[e.level].max_chain,e.strstart=0,e.block_start=0,e.lookahead=0,e.insert=0,e.match_length=e.prev_length=x-1,e.match_available=0,e.ins_h=0),a}function G(t,e,a,i,n,r){if(!t)return g;var s=1;if(e===m&&(e=6),i<0?(s=0,i=-i):15<i&&(s=2,i-=16),n<1||v<n||a!==p||i<8||15<i||e<0||9<e||r<0||w<r)return N(t,g);8===i&&(i=9);var o=new P;return(t.state=o).strm=t,o.wrap=s,o.gzhead=null,o.w_bits=i,o.w_size=1<<o.w_bits,o.w_mask=o.w_size-1,o.hash_bits=n+7,o.hash_size=1<<o.hash_bits,o.hash_mask=o.hash_size-1,o.hash_shift=~~((o.hash_bits+x-1)/x),o.window=new _.Buf8(2*o.w_size),o.head=new _.Buf16(o.hash_size),o.prev=new _.Buf16(o.w_size),o.lit_bufsize=1<<n+6,o.pending_buf_size=4*o.lit_bufsize,o.pending_buf=new _.Buf8(o.pending_buf_size),o.d_buf=1*o.lit_bufsize,o.l_buf=3*o.lit_bufsize,o.level=e,o.strategy=r,o.method=a,q(t)}l=[new M(0,0,0,0,function(t,e){var a=65535;for(a>t.pending_buf_size-5&&(a=t.pending_buf_size-5);;){if(t.lookahead<=1){if(H(t),0===t.lookahead&&e===d)return A;if(0===t.lookahead)break}t.strstart+=t.lookahead,t.lookahead=0;var i=t.block_start+a;if((0===t.strstart||t.strstart>=i)&&(t.lookahead=t.strstart-i,t.strstart=i,U(t,!1),0===t.strm.avail_out))return A;if(t.strstart-t.block_start>=t.w_size-B&&(U(t,!1),0===t.strm.avail_out))return A}return t.insert=0,e===f?(U(t,!0),0===t.strm.avail_out?R:C):(t.strstart>t.block_start&&(U(t,!1),t.strm.avail_out),A)}),new M(4,4,8,4,j),new M(4,5,16,8,j),new M(4,6,32,32,j),new M(4,4,16,16,K),new M(8,16,32,32,K),new M(8,16,128,128,K),new M(8,32,128,256,K),new M(32,128,258,1024,K),new M(32,258,258,4096,K)],a.deflateInit=function(t,e){return G(t,e,p,15,8,0)},a.deflateInit2=G,a.deflateReset=q,a.deflateResetKeep=Y,a.deflateSetHeader=function(t,e){return t&&t.state?2!==t.state.wrap?g:(t.state.gzhead=e,b):g},a.deflate=function(t,e){var a,i,n,r;if(!t||!t.state||5<e||e<0)return t?N(t,g):g;if(i=t.state,!t.output||!t.input&&0!==t.avail_in||666===i.status&&e!==f)return N(t,0===t.avail_out?-5:g);if(i.strm=t,a=i.last_flush,i.last_flush=e,i.status===S)if(2===i.wrap)t.adler=0,T(i,31),T(i,139),T(i,8),i.gzhead?(T(i,(i.gzhead.text?1:0)+(i.gzhead.hcrc?2:0)+(i.gzhead.extra?4:0)+(i.gzhead.name?8:0)+(i.gzhead.comment?16:0)),T(i,255&i.gzhead.time),T(i,i.gzhead.time>>8&255),T(i,i.gzhead.time>>16&255),T(i,i.gzhead.time>>24&255),T(i,9===i.level?2:2<=i.strategy||i.level<2?4:0),T(i,255&i.gzhead.os),i.gzhead.extra&&i.gzhead.extra.length&&(T(i,255&i.gzhead.extra.length),T(i,i.gzhead.extra.length>>8&255)),i.gzhead.hcrc&&(t.adler=c(t.adler,i.pending_buf,i.pending,0)),i.gzindex=0,i.status=69):(T(i,0),T(i,0),T(i,0),T(i,0),T(i,0),T(i,9===i.level?2:2<=i.strategy||i.level<2?4:0),T(i,3),i.status=E);else{var s=p+(i.w_bits-8<<4)<<8;s|=(2<=i.strategy||i.level<2?0:i.level<6?1:6===i.level?2:3)<<6,0!==i.strstart&&(s|=32),s+=31-s%31,i.status=E,F(i,s),0!==i.strstart&&(F(i,t.adler>>>16),F(i,65535&t.adler)),t.adler=1}if(69===i.status)if(i.gzhead.extra){for(n=i.pending;i.gzindex<(65535&i.gzhead.extra.length)&&(i.pending!==i.pending_buf_size||(i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),I(t),n=i.pending,i.pending!==i.pending_buf_size));)T(i,255&i.gzhead.extra[i.gzindex]),i.gzindex++;i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),i.gzindex===i.gzhead.extra.length&&(i.gzindex=0,i.status=73)}else i.status=73;if(73===i.status)if(i.gzhead.name){n=i.pending;do{if(i.pending===i.pending_buf_size&&(i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),I(t),n=i.pending,i.pending===i.pending_buf_size)){r=1;break}T(i,r=i.gzindex<i.gzhead.name.length?255&i.gzhead.name.charCodeAt(i.gzindex++):0)}while(0!==r);i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),0===r&&(i.gzindex=0,i.status=91)}else i.status=91;if(91===i.status)if(i.gzhead.comment){n=i.pending;do{if(i.pending===i.pending_buf_size&&(i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),I(t),n=i.pending,i.pending===i.pending_buf_size)){r=1;break}T(i,r=i.gzindex<i.gzhead.comment.length?255&i.gzhead.comment.charCodeAt(i.gzindex++):0)}while(0!==r);i.gzhead.hcrc&&i.pending>n&&(t.adler=c(t.adler,i.pending_buf,i.pending-n,n)),0===r&&(i.status=103)}else i.status=103;if(103===i.status&&(i.gzhead.hcrc?(i.pending+2>i.pending_buf_size&&I(t),i.pending+2<=i.pending_buf_size&&(T(i,255&t.adler),T(i,t.adler>>8&255),t.adler=0,i.status=E)):i.status=E),0!==i.pending){if(I(t),0===t.avail_out)return i.last_flush=-1,b}else if(0===t.avail_in&&O(e)<=O(a)&&e!==f)return N(t,-5);if(666===i.status&&0!==t.avail_in)return N(t,-5);if(0!==t.avail_in||0!==i.lookahead||e!==d&&666!==i.status){var o=2===i.strategy?function(t,e){for(var a;;){if(0===t.lookahead&&(H(t),0===t.lookahead)){if(e===d)return A;break}if(t.match_length=0,a=h._tr_tally(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++,a&&(U(t,!1),0===t.strm.avail_out))return A}return t.insert=0,e===f?(U(t,!0),0===t.strm.avail_out?R:C):t.last_lit&&(U(t,!1),0===t.strm.avail_out)?A:Z}(i,e):3===i.strategy?function(t,e){for(var a,i,n,r,s=t.window;;){if(t.lookahead<=z){if(H(t),t.lookahead<=z&&e===d)return A;if(0===t.lookahead)break}if(t.match_length=0,t.lookahead>=x&&0<t.strstart&&(i=s[n=t.strstart-1])===s[++n]&&i===s[++n]&&i===s[++n]){r=t.strstart+z;do{}while(i===s[++n]&&i===s[++n]&&i===s[++n]&&i===s[++n]&&i===s[++n]&&i===s[++n]&&i===s[++n]&&i===s[++n]&&n<r);t.match_length=z-(r-n),t.match_length>t.lookahead&&(t.match_length=t.lookahead)}if(t.match_length>=x?(a=h._tr_tally(t,1,t.match_length-x),t.lookahead-=t.match_length,t.strstart+=t.match_length,t.match_length=0):(a=h._tr_tally(t,0,t.window[t.strstart]),t.lookahead--,t.strstart++),a&&(U(t,!1),0===t.strm.avail_out))return A}return t.insert=0,e===f?(U(t,!0),0===t.strm.avail_out?R:C):t.last_lit&&(U(t,!1),0===t.strm.avail_out)?A:Z}(i,e):l[i.level].func(i,e);if(o!==R&&o!==C||(i.status=666),o===A||o===R)return 0===t.avail_out&&(i.last_flush=-1),b;if(o===Z&&(1===e?h._tr_align(i):5!==e&&(h._tr_stored_block(i,0,0,!1),3===e&&(D(i.head),0===i.lookahead&&(i.strstart=0,i.block_start=0,i.insert=0))),I(t),0===t.avail_out))return i.last_flush=-1,b}return e!==f?b:i.wrap<=0?1:(2===i.wrap?(T(i,255&t.adler),T(i,t.adler>>8&255),T(i,t.adler>>16&255),T(i,t.adler>>24&255),T(i,255&t.total_in),T(i,t.total_in>>8&255),T(i,t.total_in>>16&255),T(i,t.total_in>>24&255)):(F(i,t.adler>>>16),F(i,65535&t.adler)),I(t),0<i.wrap&&(i.wrap=-i.wrap),0!==i.pending?b:1)},a.deflateEnd=function(t){var e;return t&&t.state?(e=t.state.status)!==S&&69!==e&&73!==e&&91!==e&&103!==e&&e!==E&&666!==e?N(t,g):(t.state=null,e===E?N(t,-3):b):g},a.deflateSetDictionary=function(t,e){var a,i,n,r,s,o,l,h,d=e.length;if(!t||!t.state)return g;if(2===(r=(a=t.state).wrap)||1===r&&a.status!==S||a.lookahead)return g;for(1===r&&(t.adler=u(t.adler,e,d,0)),a.wrap=0,d>=a.w_size&&(0===r&&(D(a.head),a.strstart=0,a.block_start=0,a.insert=0),h=new _.Buf8(a.w_size),_.arraySet(h,e,d-a.w_size,a.w_size,0),e=h,d=a.w_size),s=t.avail_in,o=t.next_in,l=t.input,t.avail_in=d,t.next_in=0,t.input=e,H(a);a.lookahead>=x;){for(i=a.strstart,n=a.lookahead-(x-1);a.ins_h=(a.ins_h<<a.hash_shift^a.window[i+x-1])&a.hash_mask,a.prev[i&a.w_mask]=a.head[a.ins_h],a.head[a.ins_h]=i,i++,--n;);a.strstart=i,a.lookahead=x-1,H(a)}return a.strstart+=a.lookahead,a.block_start=a.strstart,a.insert=a.lookahead,a.lookahead=0,a.match_length=a.prev_length=x-1,a.match_available=0,t.next_in=o,t.input=l,t.avail_in=s,a.wrap=r,b},a.deflateInfo="pako deflate (from Nodeca project)"},{"../utils/common":3,"./adler32":5,"./crc32":7,"./messages":13,"./trees":14}],9:[function(t,e,a){"use strict";e.exports=function(){this.text=0,this.time=0,this.xflags=0,this.os=0,this.extra=null,this.extra_len=0,this.name="",this.comment="",this.hcrc=0,this.done=!1}},{}],10:[function(t,e,a){"use strict";e.exports=function(t,e){var a,i,n,r,s,o,l,h,d,f,_,u,c,b,g,m,w,p,v,k,y,x,z,B,S;a=t.state,i=t.next_in,B=t.input,n=i+(t.avail_in-5),r=t.next_out,S=t.output,s=r-(e-t.avail_out),o=r+(t.avail_out-257),l=a.dmax,h=a.wsize,d=a.whave,f=a.wnext,_=a.window,u=a.hold,c=a.bits,b=a.lencode,g=a.distcode,m=(1<<a.lenbits)-1,w=(1<<a.distbits)-1;t:do{c<15&&(u+=B[i++]<<c,c+=8,u+=B[i++]<<c,c+=8),p=b[u&m];e:for(;;){if(u>>>=v=p>>>24,c-=v,0===(v=p>>>16&255))S[r++]=65535&p;else{if(!(16&v)){if(0==(64&v)){p=b[(65535&p)+(u&(1<<v)-1)];continue e}if(32&v){a.mode=12;break t}t.msg="invalid literal/length code",a.mode=30;break t}k=65535&p,(v&=15)&&(c<v&&(u+=B[i++]<<c,c+=8),k+=u&(1<<v)-1,u>>>=v,c-=v),c<15&&(u+=B[i++]<<c,c+=8,u+=B[i++]<<c,c+=8),p=g[u&w];a:for(;;){if(u>>>=v=p>>>24,c-=v,!(16&(v=p>>>16&255))){if(0==(64&v)){p=g[(65535&p)+(u&(1<<v)-1)];continue a}t.msg="invalid distance code",a.mode=30;break t}if(y=65535&p,c<(v&=15)&&(u+=B[i++]<<c,(c+=8)<v&&(u+=B[i++]<<c,c+=8)),l<(y+=u&(1<<v)-1)){t.msg="invalid distance too far back",a.mode=30;break 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t;for(u=0;y=i[r+u++],a.head&&y&&a.length<65536&&(a.head.name+=String.fromCharCode(y)),y&&u<o;);if(512&a.flags&&(a.check=C(a.check,i,u,r)),o-=u,r+=u,y)break t}else a.head&&(a.head.name=null);a.length=0,a.mode=8;case 8:if(4096&a.flags){if(0===o)break t;for(u=0;y=i[r+u++],a.head&&y&&a.length<65536&&(a.head.comment+=String.fromCharCode(y)),y&&u<o;);if(512&a.flags&&(a.check=C(a.check,i,u,r)),o-=u,r+=u,y)break t}else a.head&&(a.head.comment=null);a.mode=9;case 9:if(512&a.flags){for(;d<16;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(h!==(65535&a.check)){t.msg="header crc mismatch",a.mode=30;break}d=h=0}a.head&&(a.head.hcrc=a.flags>>9&1,a.head.done=!0),t.adler=a.check=0,a.mode=12;break;case 10:for(;d<32;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}t.adler=a.check=L(h),d=h=0,a.mode=11;case 11:if(0===a.havedict)return t.next_out=s,t.avail_out=l,t.next_in=r,t.avail_in=o,a.hold=h,a.bits=d,2;t.adler=a.check=1,a.mode=12;case 12:if(5===e||6===e)break t;case 13:if(a.last){h>>>=7&d,d-=7&d,a.mode=27;break}for(;d<3;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}switch(a.last=1&h,d-=1,3&(h>>>=1)){case 0:a.mode=14;break;case 1:if(H(a),a.mode=20,6!==e)break;h>>>=2,d-=2;break t;case 2:a.mode=17;break;case 3:t.msg="invalid block type",a.mode=30}h>>>=2,d-=2;break;case 14:for(h>>>=7&d,d-=7&d;d<32;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if((65535&h)!=(h>>>16^65535)){t.msg="invalid stored block lengths",a.mode=30;break}if(a.length=65535&h,d=h=0,a.mode=15,6===e)break t;case 15:a.mode=16;case 16:if(u=a.length){if(o<u&&(u=o),l<u&&(u=l),0===u)break t;Z.arraySet(n,i,r,u,s),o-=u,r+=u,l-=u,s+=u,a.length-=u;break}a.mode=12;break;case 17:for(;d<14;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(a.nlen=257+(31&h),h>>>=5,d-=5,a.ndist=1+(31&h),h>>>=5,d-=5,a.ncode=4+(15&h),h>>>=4,d-=4,286<a.nlen||30<a.ndist){t.msg="too many length or distance symbols",a.mode=30;break}a.have=0,a.mode=18;case 18:for(;a.have<a.ncode;){for(;d<3;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}a.lens[A[a.have++]]=7&h,h>>>=3,d-=3}for(;a.have<19;)a.lens[A[a.have++]]=0;if(a.lencode=a.lendyn,a.lenbits=7,z={bits:a.lenbits},x=O(0,a.lens,0,19,a.lencode,0,a.work,z),a.lenbits=z.bits,x){t.msg="invalid code lengths set",a.mode=30;break}a.have=0,a.mode=19;case 19:for(;a.have<a.nlen+a.ndist;){for(;m=(S=a.lencode[h&(1<<a.lenbits)-1])>>>16&255,w=65535&S,!((g=S>>>24)<=d);){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(w<16)h>>>=g,d-=g,a.lens[a.have++]=w;else{if(16===w){for(B=g+2;d<B;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(h>>>=g,d-=g,0===a.have){t.msg="invalid bit length repeat",a.mode=30;break}y=a.lens[a.have-1],u=3+(3&h),h>>>=2,d-=2}else if(17===w){for(B=g+3;d<B;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}d-=g,y=0,u=3+(7&(h>>>=g)),h>>>=3,d-=3}else{for(B=g+7;d<B;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}d-=g,y=0,u=11+(127&(h>>>=g)),h>>>=7,d-=7}if(a.have+u>a.nlen+a.ndist){t.msg="invalid bit length repeat",a.mode=30;break}for(;u--;)a.lens[a.have++]=y}}if(30===a.mode)break;if(0===a.lens[256]){t.msg="invalid code -- missing end-of-block",a.mode=30;break}if(a.lenbits=9,z={bits:a.lenbits},x=O(D,a.lens,0,a.nlen,a.lencode,0,a.work,z),a.lenbits=z.bits,x){t.msg="invalid literal/lengths set",a.mode=30;break}if(a.distbits=6,a.distcode=a.distdyn,z={bits:a.distbits},x=O(I,a.lens,a.nlen,a.ndist,a.distcode,0,a.work,z),a.distbits=z.bits,x){t.msg="invalid distances set",a.mode=30;break}if(a.mode=20,6===e)break t;case 20:a.mode=21;case 21:if(6<=o&&258<=l){t.next_out=s,t.avail_out=l,t.next_in=r,t.avail_in=o,a.hold=h,a.bits=d,N(t,_),s=t.next_out,n=t.output,l=t.avail_out,r=t.next_in,i=t.input,o=t.avail_in,h=a.hold,d=a.bits,12===a.mode&&(a.back=-1);break}for(a.back=0;m=(S=a.lencode[h&(1<<a.lenbits)-1])>>>16&255,w=65535&S,!((g=S>>>24)<=d);){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(m&&0==(240&m)){for(p=g,v=m,k=w;m=(S=a.lencode[k+((h&(1<<p+v)-1)>>p)])>>>16&255,w=65535&S,!(p+(g=S>>>24)<=d);){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}h>>>=p,d-=p,a.back+=p}if(h>>>=g,d-=g,a.back+=g,a.length=w,0===m){a.mode=26;break}if(32&m){a.back=-1,a.mode=12;break}if(64&m){t.msg="invalid literal/length code",a.mode=30;break}a.extra=15&m,a.mode=22;case 22:if(a.extra){for(B=a.extra;d<B;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}a.length+=h&(1<<a.extra)-1,h>>>=a.extra,d-=a.extra,a.back+=a.extra}a.was=a.length,a.mode=23;case 23:for(;m=(S=a.distcode[h&(1<<a.distbits)-1])>>>16&255,w=65535&S,!((g=S>>>24)<=d);){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(0==(240&m)){for(p=g,v=m,k=w;m=(S=a.distcode[k+((h&(1<<p+v)-1)>>p)])>>>16&255,w=65535&S,!(p+(g=S>>>24)<=d);){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}h>>>=p,d-=p,a.back+=p}if(h>>>=g,d-=g,a.back+=g,64&m){t.msg="invalid distance code",a.mode=30;break}a.offset=w,a.extra=15&m,a.mode=24;case 24:if(a.extra){for(B=a.extra;d<B;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}a.offset+=h&(1<<a.extra)-1,h>>>=a.extra,d-=a.extra,a.back+=a.extra}if(a.offset>a.dmax){t.msg="invalid distance too far back",a.mode=30;break}a.mode=25;case 25:if(0===l)break t;if(u=_-l,a.offset>u){if((u=a.offset-u)>a.whave&&a.sane){t.msg="invalid distance too far back",a.mode=30;break}u>a.wnext?(u-=a.wnext,c=a.wsize-u):c=a.wnext-u,u>a.length&&(u=a.length),b=a.window}else b=n,c=s-a.offset,u=a.length;for(l<u&&(u=l),l-=u,a.length-=u;n[s++]=b[c++],--u;);0===a.length&&(a.mode=21);break;case 26:if(0===l)break t;n[s++]=a.length,l--,a.mode=21;break;case 27:if(a.wrap){for(;d<32;){if(0===o)break t;o--,h|=i[r++]<<d,d+=8}if(_-=l,t.total_out+=_,a.total+=_,_&&(t.adler=a.check=a.flags?C(a.check,n,_,s-_):R(a.check,n,_,s-_)),_=l,(a.flags?h:L(h))!==a.check){t.msg="incorrect data check",a.mode=30;break}d=h=0}a.mode=28;case 28:if(a.wrap&&a.flags){for(;d<32;){if(0===o)break t;o--,h+=i[r++]<<d,d+=8}if(h!==(4294967295&a.total)){t.msg="incorrect length check",a.mode=30;break}d=h=0}a.mode=29;case 29:x=1;break t;case 30:x=-3;break t;case 31:return-4;case 32:default:return T}return t.next_out=s,t.avail_out=l,t.next_in=r,t.avail_in=o,a.hold=h,a.bits=d,(a.wsize||_!==t.avail_out&&a.mode<30&&(a.mode<27||4!==e))&&j(t,t.output,t.next_out,_-t.avail_out)?(a.mode=31,-4):(f-=t.avail_in,_-=t.avail_out,t.total_in+=f,t.total_out+=_,a.total+=_,a.wrap&&_&&(t.adler=a.check=a.flags?C(a.check,n,_,t.next_out-_):R(a.check,n,_,t.next_out-_)),t.data_type=a.bits+(a.last?64:0)+(12===a.mode?128:0)+(20===a.mode||15===a.mode?256:0),(0===f&&0===_||4===e)&&x===U&&(x=-5),x)},a.inflateEnd=function(t){if(!t||!t.state)return T;var e=t.state;return e.window&&(e.window=null),t.state=null,U},a.inflateGetHeader=function(t,e){var a;return t&&t.state?0==(2&(a=t.state).wrap)?T:((a.head=e).done=!1,U):T},a.inflateSetDictionary=function(t,e){var a,i=e.length;return t&&t.state?0!==(a=t.state).wrap&&11!==a.mode?T:11===a.mode&&R(1,e,i,0)!==a.check?-3:j(t,e,i,i)?(a.mode=31,-4):(a.havedict=1,U):T},a.inflateInfo="pako inflate (from Nodeca project)"},{"../utils/common":3,"./adler32":5,"./crc32":7,"./inffast":10,"./inftrees":12}],12:[function(t,e,a){"use strict";var D=t("../utils/common"),I=[3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258,0,0],U=[16,16,16,16,16,16,16,16,17,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,16,72,78],T=[1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0],F=[16,16,16,16,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,64,64];e.exports=function(t,e,a,i,n,r,s,o){var l,h,d,f,_,u,c,b,g,m=o.bits,w=0,p=0,v=0,k=0,y=0,x=0,z=0,B=0,S=0,E=0,A=null,Z=0,R=new D.Buf16(16),C=new D.Buf16(16),N=null,O=0;for(w=0;w<=15;w++)R[w]=0;for(p=0;p<i;p++)R[e[a+p]]++;for(y=m,k=15;1<=k&&0===R[k];k--);if(k<y&&(y=k),0===k)return n[r++]=20971520,n[r++]=20971520,o.bits=1,0;for(v=1;v<k&&0===R[v];v++);for(y<v&&(y=v),w=B=1;w<=15;w++)if(B<<=1,(B-=R[w])<0)return-1;if(0<B&&(0===t||1!==k))return-1;for(C[1]=0,w=1;w<15;w++)C[w+1]=C[w]+R[w];for(p=0;p<i;p++)0!==e[a+p]&&(s[C[e[a+p]]++]=p);if(0===t?(A=N=s,u=19):1===t?(A=I,Z-=257,N=U,O-=257,u=256):(A=T,N=F,u=-1),w=v,_=r,z=p=E=0,d=-1,f=(S=1<<(x=y))-1,1===t&&852<S||2===t&&592<S)return 1;for(;;){for(c=w-z,s[p]<u?(b=0,g=s[p]):s[p]>u?(b=N[O+s[p]],g=A[Z+s[p]]):(b=96,g=0),l=1<<w-z,v=h=1<<x;n[_+(E>>z)+(h-=l)]=c<<24|b<<16|g|0,0!==h;);for(l=1<<w-1;E&l;)l>>=1;if(0!==l?(E&=l-1,E+=l):E=0,p++,0==--R[w]){if(w===k)break;w=e[a+s[p]]}if(y<w&&(E&f)!==d){for(0===z&&(z=y),_+=v,B=1<<(x=w-z);x+z<k&&!((B-=R[x+z])<=0);)x++,B<<=1;if(S+=1<<x,1===t&&852<S||2===t&&592<S)return 1;n[d=E&f]=y<<24|x<<16|_-r|0}}return 0!==E&&(n[_+E]=w-z<<24|64<<16|0),o.bits=y,0}},{"../utils/common":3}],13:[function(t,e,a){"use strict";e.exports={2:"need dictionary",1:"stream end",0:"","-1":"file error","-2":"stream error","-3":"data error","-4":"insufficient memory","-5":"buffer error","-6":"incompatible version"}},{}],14:[function(t,e,a){"use strict";var l=t("../utils/common"),o=0,h=1;function i(t){for(var e=t.length;0<=--e;)t[e]=0}var d=0,s=29,f=256,_=f+1+s,u=30,c=19,g=2*_+1,m=15,n=16,b=7,w=256,p=16,v=17,k=18,y=[0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0],x=[0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13],z=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7],B=[16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15],S=new Array(2*(_+2));i(S);var E=new Array(2*u);i(E);var A=new Array(512);i(A);var Z=new Array(256);i(Z);var R=new Array(s);i(R);var C,N,O,D=new Array(u);function I(t,e,a,i,n){this.static_tree=t,this.extra_bits=e,this.extra_base=a,this.elems=i,this.max_length=n,this.has_stree=t&&t.length}function r(t,e){this.dyn_tree=t,this.max_code=0,this.stat_desc=e}function U(t){return t<256?A[t]:A[256+(t>>>7)]}function T(t,e){t.pending_buf[t.pending++]=255&e,t.pending_buf[t.pending++]=e>>>8&255}function F(t,e,a){t.bi_valid>n-a?(t.bi_buf|=e<<t.bi_valid&65535,T(t,t.bi_buf),t.bi_buf=e>>n-t.bi_valid,t.bi_valid+=a-n):(t.bi_buf|=e<<t.bi_valid&65535,t.bi_valid+=a)}function L(t,e,a){F(t,a[2*e],a[2*e+1])}function H(t,e){for(var a=0;a|=1&t,t>>>=1,a<<=1,0<--e;);return a>>>1}function j(t,e,a){var i,n,r=new Array(m+1),s=0;for(i=1;i<=m;i++)r[i]=s=s+a[i-1]<<1;for(n=0;n<=e;n++){var o=t[2*n+1];0!==o&&(t[2*n]=H(r[o]++,o))}}function K(t){var e;for(e=0;e<_;e++)t.dyn_ltree[2*e]=0;for(e=0;e<u;e++)t.dyn_dtree[2*e]=0;for(e=0;e<c;e++)t.bl_tree[2*e]=0;t.dyn_ltree[2*w]=1,t.opt_len=t.static_len=0,t.last_lit=t.matches=0}function M(t){8<t.bi_valid?T(t,t.bi_buf):0<t.bi_valid&&(t.pending_buf[t.pending++]=t.bi_buf),t.bi_buf=0,t.bi_valid=0}function P(t,e,a,i){var n=2*e,r=2*a;return t[n]<t[r]||t[n]===t[r]&&i[e]<=i[a]}function Y(t,e,a){for(var i=t.heap[a],n=a<<1;n<=t.heap_len&&(n<t.heap_len&&P(e,t.heap[n+1],t.heap[n],t.depth)&&n++,!P(e,i,t.heap[n],t.depth));)t.heap[a]=t.heap[n],a=n,n<<=1;t.heap[a]=i}function q(t,e,a){var i,n,r,s,o=0;if(0!==t.last_lit)for(;i=t.pending_buf[t.d_buf+2*o]<<8|t.pending_buf[t.d_buf+2*o+1],n=t.pending_buf[t.l_buf+o],o++,0===i?L(t,n,e):(L(t,(r=Z[n])+f+1,e),0!==(s=y[r])&&F(t,n-=R[r],s),L(t,r=U(--i),a),0!==(s=x[r])&&F(t,i-=D[r],s)),o<t.last_lit;);L(t,w,e)}function G(t,e){var a,i,n,r=e.dyn_tree,s=e.stat_desc.static_tree,o=e.stat_desc.has_stree,l=e.stat_desc.elems,h=-1;for(t.heap_len=0,t.heap_max=g,a=0;a<l;a++)0!==r[2*a]?(t.heap[++t.heap_len]=h=a,t.depth[a]=0):r[2*a+1]=0;for(;t.heap_len<2;)r[2*(n=t.heap[++t.heap_len]=h<2?++h:0)]=1,t.depth[n]=0,t.opt_len--,o&&(t.static_len-=s[2*n+1]);for(e.max_code=h,a=t.heap_len>>1;1<=a;a--)Y(t,r,a);for(n=l;a=t.heap[1],t.heap[1]=t.heap[t.heap_len--],Y(t,r,1),i=t.heap[1],t.heap[--t.heap_max]=a,t.heap[--t.heap_max]=i,r[2*n]=r[2*a]+r[2*i],t.depth[n]=(t.depth[a]>=t.depth[i]?t.depth[a]:t.depth[i])+1,r[2*a+1]=r[2*i+1]=n,t.heap[1]=n++,Y(t,r,1),2<=t.heap_len;);t.heap[--t.heap_max]=t.heap[1],function(t,e){var a,i,n,r,s,o,l=e.dyn_tree,h=e.max_code,d=e.stat_desc.static_tree,f=e.stat_desc.has_stree,_=e.stat_desc.extra_bits,u=e.stat_desc.extra_base,c=e.stat_desc.max_length,b=0;for(r=0;r<=m;r++)t.bl_count[r]=0;for(l[2*t.heap[t.heap_max]+1]=0,a=t.heap_max+1;a<g;a++)c<(r=l[2*l[2*(i=t.heap[a])+1]+1]+1)&&(r=c,b++),l[2*i+1]=r,h<i||(t.bl_count[r]++,s=0,u<=i&&(s=_[i-u]),o=l[2*i],t.opt_len+=o*(r+s),f&&(t.static_len+=o*(d[2*i+1]+s)));if(0!==b){do{for(r=c-1;0===t.bl_count[r];)r--;t.bl_count[r]--,t.bl_count[r+1]+=2,t.bl_count[c]--,b-=2}while(0<b);for(r=c;0!==r;r--)for(i=t.bl_count[r];0!==i;)h<(n=t.heap[--a])||(l[2*n+1]!==r&&(t.opt_len+=(r-l[2*n+1])*l[2*n],l[2*n+1]=r),i--)}}(t,e),j(r,h,t.bl_count)}function X(t,e,a){var i,n,r=-1,s=e[1],o=0,l=7,h=4;for(0===s&&(l=138,h=3),e[2*(a+1)+1]=65535,i=0;i<=a;i++)n=s,s=e[2*(i+1)+1],++o<l&&n===s||(o<h?t.bl_tree[2*n]+=o:0!==n?(n!==r&&t.bl_tree[2*n]++,t.bl_tree[2*p]++):o<=10?t.bl_tree[2*v]++:t.bl_tree[2*k]++,r=n,(o=0)===s?(l=138,h=3):n===s?(l=6,h=3):(l=7,h=4))}function W(t,e,a){var i,n,r=-1,s=e[1],o=0,l=7,h=4;for(0===s&&(l=138,h=3),i=0;i<=a;i++)if(n=s,s=e[2*(i+1)+1],!(++o<l&&n===s)){if(o<h)for(;L(t,n,t.bl_tree),0!=--o;);else 0!==n?(n!==r&&(L(t,n,t.bl_tree),o--),L(t,p,t.bl_tree),F(t,o-3,2)):o<=10?(L(t,v,t.bl_tree),F(t,o-3,3)):(L(t,k,t.bl_tree),F(t,o-11,7));r=n,(o=0)===s?(l=138,h=3):n===s?(l=6,h=3):(l=7,h=4)}}i(D);var J=!1;function Q(t,e,a,i){var n,r,s,o;F(t,(d<<1)+(i?1:0),3),r=e,s=a,o=!0,M(n=t),o&&(T(n,s),T(n,~s)),l.arraySet(n.pending_buf,n.window,r,s,n.pending),n.pending+=s}a._tr_init=function(t){J||(function(){var t,e,a,i,n,r=new Array(m+1);for(i=a=0;i<s-1;i++)for(R[i]=a,t=0;t<1<<y[i];t++)Z[a++]=i;for(Z[a-1]=i,i=n=0;i<16;i++)for(D[i]=n,t=0;t<1<<x[i];t++)A[n++]=i;for(n>>=7;i<u;i++)for(D[i]=n<<7,t=0;t<1<<x[i]-7;t++)A[256+n++]=i;for(e=0;e<=m;e++)r[e]=0;for(t=0;t<=143;)S[2*t+1]=8,t++,r[8]++;for(;t<=255;)S[2*t+1]=9,t++,r[9]++;for(;t<=279;)S[2*t+1]=7,t++,r[7]++;for(;t<=287;)S[2*t+1]=8,t++,r[8]++;for(j(S,_+1,r),t=0;t<u;t++)E[2*t+1]=5,E[2*t]=H(t,5);C=new I(S,y,f+1,_,m),N=new I(E,x,0,u,m),O=new I(new Array(0),z,0,c,b)}(),J=!0),t.l_desc=new r(t.dyn_ltree,C),t.d_desc=new r(t.dyn_dtree,N),t.bl_desc=new r(t.bl_tree,O),t.bi_buf=0,t.bi_valid=0,K(t)},a._tr_stored_block=Q,a._tr_flush_block=function(t,e,a,i){var n,r,s=0;0<t.level?(2===t.strm.data_type&&(t.strm.data_type=function(t){var e,a=4093624447;for(e=0;e<=31;e++,a>>>=1)if(1&a&&0!==t.dyn_ltree[2*e])return o;if(0!==t.dyn_ltree[18]||0!==t.dyn_ltree[20]||0!==t.dyn_ltree[26])return h;for(e=32;e<f;e++)if(0!==t.dyn_ltree[2*e])return h;return o}(t)),G(t,t.l_desc),G(t,t.d_desc),s=function(t){var e;for(X(t,t.dyn_ltree,t.l_desc.max_code),X(t,t.dyn_dtree,t.d_desc.max_code),G(t,t.bl_desc),e=c-1;3<=e&&0===t.bl_tree[2*B[e]+1];e--);return t.opt_len+=3*(e+1)+5+5+4,e}(t),n=t.opt_len+3+7>>>3,(r=t.static_len+3+7>>>3)<=n&&(n=r)):n=r=a+5,a+4<=n&&-1!==e?Q(t,e,a,i):4===t.strategy||r===n?(F(t,2+(i?1:0),3),q(t,S,E)):(F(t,4+(i?1:0),3),function(t,e,a,i){var n;for(F(t,e-257,5),F(t,a-1,5),F(t,i-4,4),n=0;n<i;n++)F(t,t.bl_tree[2*B[n]+1],3);W(t,t.dyn_ltree,e-1),W(t,t.dyn_dtree,a-1)}(t,t.l_desc.max_code+1,t.d_desc.max_code+1,s+1),q(t,t.dyn_ltree,t.dyn_dtree)),K(t),i&&M(t)},a._tr_tally=function(t,e,a){return t.pending_buf[t.d_buf+2*t.last_lit]=e>>>8&255,t.pending_buf[t.d_buf+2*t.last_lit+1]=255&e,t.pending_buf[t.l_buf+t.last_lit]=255&a,t.last_lit++,0===e?t.dyn_ltree[2*a]++:(t.matches++,e--,t.dyn_ltree[2*(Z[a]+f+1)]++,t.dyn_dtree[2*U(e)]++),t.last_lit===t.lit_bufsize-1},a._tr_align=function(t){var e;F(t,2,3),L(t,w,S),16===(e=t).bi_valid?(T(e,e.bi_buf),e.bi_buf=0,e.bi_valid=0):8<=e.bi_valid&&(e.pending_buf[e.pending++]=255&e.bi_buf,e.bi_buf>>=8,e.bi_valid-=8)}},{"../utils/common":3}],15:[function(t,e,a){"use strict";e.exports=function(){this.input=null,this.next_in=0,this.avail_in=0,this.total_in=0,this.output=null,this.next_out=0,this.avail_out=0,this.total_out=0,this.msg="",this.state=null,this.data_type=2,this.adler=0}},{}],"/":[function(t,e,a){"use strict";var i={};(0,t("./lib/utils/common").assign)(i,t("./lib/deflate"),t("./lib/inflate"),t("./lib/zlib/constants")),e.exports=i},{"./lib/deflate":1,"./lib/inflate":2,"./lib/utils/common":3,"./lib/zlib/constants":6}]},{},[])("/")});
+
+
+var UPNG = {};
+
+
+UPNG._bin = {
+  nextZero   : function(data,p)  {  while(data[p]!=0) p++;  return p;  },
+  readUshort : function(buff,p)  {  return (buff[p]<< 8) | buff[p+1];  },
+  writeUshort: function(buff,p,n){  buff[p] = (n>>8)&255;  buff[p+1] = n&255;  },
+  readUint   : function(buff,p)  {  return (buff[p]*(256*256*256)) + ((buff[p+1]<<16) | (buff[p+2]<< 8) | buff[p+3]);  },
+  writeUint  : function(buff,p,n){  buff[p]=(n>>24)&255;  buff[p+1]=(n>>16)&255;  buff[p+2]=(n>>8)&255;  buff[p+3]=n&255;  },
+  readASCII  : function(buff,p,l){  var s = "";  for(var i=0; i<l; i++) s += String.fromCharCode(buff[p+i]);  return s;    },
+  writeASCII : function(data,p,s){  for(var i=0; i<s.length; i++) data[p+i] = s.charCodeAt(i);  },
+  readBytes  : function(buff,p,l){  var arr = [];   for(var i=0; i<l; i++) arr.push(buff[p+i]);   return arr;  },
+  pad : function(n) { return n.length < 2 ? "0" + n : n; },
+  readUTF8 : function(buff, p, l) {
+    var s = "", ns;
+    for(var i=0; i<l; i++) s += "%" + UPNG._bin.pad(buff[p+i].toString(16));
+    try {  ns = decodeURIComponent(s); }
+    catch(e) {  return UPNG._bin.readASCII(buff, p, l);  }
+    return  ns;
+  }
+}
+UPNG._copyTile = function(sb, sw, sh, tb, tw, th, xoff, yoff, mode)
+{
+  var w = Math.min(sw,tw), h = Math.min(sh,th);
+  var si=0, ti=0;
+  for(var y=0; y<h; y++)
+    for(var x=0; x<w; x++)
+    {
+      if(xoff>=0 && yoff>=0) {  si = (y*sw+x)<<2;  ti = (( yoff+y)*tw+xoff+x)<<2;  }
+      else                   {  si = ((-yoff+y)*sw-xoff+x)<<2;  ti = (y*tw+x)<<2;  }
+      
+      if     (mode==0) {  tb[ti] = sb[si];  tb[ti+1] = sb[si+1];  tb[ti+2] = sb[si+2];  tb[ti+3] = sb[si+3];  }
+      else if(mode==1) {
+        var fa = sb[si+3]*(1/255), fr=sb[si]*fa, fg=sb[si+1]*fa, fb=sb[si+2]*fa; 
+        var ba = tb[ti+3]*(1/255), br=tb[ti]*ba, bg=tb[ti+1]*ba, bb=tb[ti+2]*ba; 
+        
+        var ifa=1-fa, oa = fa+ba*ifa, ioa = (oa==0?0:1/oa);
+        tb[ti+3] = 255*oa;  
+        tb[ti+0] = (fr+br*ifa)*ioa;  
+        tb[ti+1] = (fg+bg*ifa)*ioa;   
+        tb[ti+2] = (fb+bb*ifa)*ioa;  
+      }
+      else if(mode==2){ // copy only differences, otherwise zero
+        var fa = sb[si+3], fr=sb[si], fg=sb[si+1], fb=sb[si+2]; 
+        var ba = tb[ti+3], br=tb[ti], bg=tb[ti+1], bb=tb[ti+2]; 
+        if(fa==ba && fr==br && fg==bg && fb==bb) {  tb[ti]=0;  tb[ti+1]=0;  tb[ti+2]=0;  tb[ti+3]=0;  }
+        else {  tb[ti]=fr;  tb[ti+1]=fg;  tb[ti+2]=fb;  tb[ti+3]=fa;  }
+      }
+      else if(mode==3){ // check if can be blended
+        var fa = sb[si+3], fr=sb[si], fg=sb[si+1], fb=sb[si+2]; 
+        var ba = tb[ti+3], br=tb[ti], bg=tb[ti+1], bb=tb[ti+2]; 
+        if(fa==ba && fr==br && fg==bg && fb==bb) continue;
+        //if(fa!=255 && ba!=0) return false;
+        if(fa<220 && ba>20) return false;
+      }
+    }
+  return true;
+}
+
+
+
+
+UPNG.encode = function(bufs, w, h, ps, dels, tabs, forbidPlte)
+{
+  if(ps==null) ps=0;
+  if(forbidPlte==null) forbidPlte = false;
+
+  var nimg = UPNG.encode.compress(bufs, w, h, ps, [false, false, false, 0, forbidPlte]);
+  UPNG.encode.compressPNG(nimg, -1);
+  
+  return UPNG.encode._main(nimg, w, h, dels, tabs);
+}
+
+UPNG.encodeLL = function(bufs, w, h, cc, ac, depth, dels, tabs) {
+  var nimg = {  ctype: 0 + (cc==1 ? 0 : 2) + (ac==0 ? 0 : 4),      depth: depth,  frames: []  };
+  
+  var time = Date.now();
+  var bipp = (cc+ac)*depth, bipl = bipp * w;
+  for(var i=0; i<bufs.length; i++)
+    nimg.frames.push({  rect:{x:0,y:0,width:w,height:h},  img:new Uint8Array(bufs[i]), blend:0, dispose:1, bpp:Math.ceil(bipp/8), bpl:Math.ceil(bipl/8)  });
+  
+  UPNG.encode.compressPNG(nimg, 0, true);
+  
+  var out = UPNG.encode._main(nimg, w, h, dels, tabs);
+  return out;
+}
+
+UPNG.encode._main = function(nimg, w, h, dels, tabs) {
+  if(tabs==null) tabs={};
+  var crc = UPNG.crc.crc, wUi = UPNG._bin.writeUint, wUs = UPNG._bin.writeUshort, wAs = UPNG._bin.writeASCII;
+  var offset = 8, anim = nimg.frames.length>1, pltAlpha = false;
+  
+  var leng = 8 + (16+5+4) /*+ (9+4)*/ + (anim ? 20 : 0);
+  if(tabs["sRGB"]!=null) leng += 8+1+4;
+  if(tabs["pHYs"]!=null) leng += 8+9+4;
+  if(nimg.ctype==3) {
+    var dl = nimg.plte.length;
+    for(var i=0; i<dl; i++) if((nimg.plte[i]>>>24)!=255) pltAlpha = true;
+    leng += (8 + dl*3 + 4) + (pltAlpha ? (8 + dl*1 + 4) : 0);
+  }
+  for(var j=0; j<nimg.frames.length; j++)
+  {
+    var fr = nimg.frames[j];
+    if(anim) leng += 38;
+    leng += fr.cimg.length + 12;
+    if(j!=0) leng+=4;
+  }
+  leng += 12; 
+  
+  var data = new Uint8Array(leng);
+  var wr=[0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];
+  for(var i=0; i<8; i++) data[i]=wr[i];
+  
+  wUi(data,offset, 13);     offset+=4;
+  wAs(data,offset,"IHDR");  offset+=4;
+  wUi(data,offset,w);  offset+=4;
+  wUi(data,offset,h);  offset+=4;
+  data[offset] = nimg.depth;  offset++;  // depth
+  data[offset] = nimg.ctype;  offset++;  // ctype
+  data[offset] = 0;  offset++;  // compress
+  data[offset] = 0;  offset++;  // filter
+  data[offset] = 0;  offset++;  // interlace
+  wUi(data,offset,crc(data,offset-17,17));  offset+=4; // crc
+
+  // 13 bytes to say, that it is sRGB
+  if(tabs["sRGB"]!=null) {
+    wUi(data,offset, 1);      offset+=4;
+    wAs(data,offset,"sRGB");  offset+=4;
+    data[offset] = tabs["sRGB"];  offset++;
+    wUi(data,offset,crc(data,offset-5,5));  offset+=4; // crc
+  }
+  if(tabs["pHYs"]!=null) {
+    wUi(data,offset, 9);      offset+=4;
+    wAs(data,offset,"pHYs");  offset+=4;
+    wUi(data,offset, tabs["pHYs"][0]);      offset+=4;
+    wUi(data,offset, tabs["pHYs"][1]);      offset+=4;
+    data[offset]=tabs["pHYs"][2];     offset++;
+    wUi(data,offset,crc(data,offset-13,13));  offset+=4; // crc
+  }
+
+  if(anim) {
+    wUi(data,offset, 8);      offset+=4;
+    wAs(data,offset,"acTL");  offset+=4;
+    wUi(data,offset, nimg.frames.length);     offset+=4;
+    wUi(data,offset, tabs["loop"]!=null?tabs["loop"]:0);      offset+=4;
+    wUi(data,offset,crc(data,offset-12,12));  offset+=4; // crc
+  }
+
+  if(nimg.ctype==3) {
+    var dl = nimg.plte.length;
+    wUi(data,offset, dl*3);  offset+=4;
+    wAs(data,offset,"PLTE");  offset+=4;
+    for(var i=0; i<dl; i++){
+      var ti=i*3, c=nimg.plte[i], r=(c)&255, g=(c>>>8)&255, b=(c>>>16)&255;
+      data[offset+ti+0]=r;  data[offset+ti+1]=g;  data[offset+ti+2]=b;
+    }
+    offset+=dl*3;
+    wUi(data,offset,crc(data,offset-dl*3-4,dl*3+4));  offset+=4; // crc
+
+    if(pltAlpha) {
+      wUi(data,offset, dl);  offset+=4;
+      wAs(data,offset,"tRNS");  offset+=4;
+      for(var i=0; i<dl; i++)  data[offset+i]=(nimg.plte[i]>>>24)&255;
+      offset+=dl;
+      wUi(data,offset,crc(data,offset-dl-4,dl+4));  offset+=4; // crc
+    }
+  }
+  
+  var fi = 0;
+  for(var j=0; j<nimg.frames.length; j++)
+  {
+    var fr = nimg.frames[j];
+    if(anim) {
+      wUi(data, offset, 26);     offset+=4;
+      wAs(data, offset,"fcTL");  offset+=4;
+      wUi(data, offset, fi++);   offset+=4;
+      wUi(data, offset, fr.rect.width );   offset+=4;
+      wUi(data, offset, fr.rect.height);   offset+=4;
+      wUi(data, offset, fr.rect.x);   offset+=4;
+      wUi(data, offset, fr.rect.y);   offset+=4;
+      wUs(data, offset, dels[j]);   offset+=2;
+      wUs(data, offset,  1000);   offset+=2;
+      data[offset] = fr.dispose;  offset++; // dispose
+      data[offset] = fr.blend  ;  offset++; // blend
+      wUi(data,offset,crc(data,offset-30,30));  offset+=4; // crc
+    }
+        
+    var imgd = fr.cimg, dl = imgd.length;
+    wUi(data,offset, dl+(j==0?0:4));     offset+=4;
+    var ioff = offset;
+    wAs(data,offset,(j==0)?"IDAT":"fdAT");  offset+=4;
+    if(j!=0) {  wUi(data, offset, fi++);  offset+=4;  }
+    data.set(imgd,offset);
+    offset += dl;
+    wUi(data,offset,crc(data,ioff,offset-ioff));  offset+=4; // crc
+  }
+
+  wUi(data,offset, 0);     offset+=4;
+  wAs(data,offset,"IEND");  offset+=4;
+  wUi(data,offset,crc(data,offset-4,4));  offset+=4; // crc
+
+  return data.buffer;
+}
+
+UPNG.encode.compressPNG = function(out, filter, levelZero) {
+  for(var i=0; i<out.frames.length; i++) {
+    var frm = out.frames[i], nw=frm.rect.width, nh=frm.rect.height;
+    var fdata = new Uint8Array(nh*frm.bpl+nh);
+    frm.cimg = UPNG.encode._filterZero(frm.img,nh,frm.bpp,frm.bpl,fdata, filter, levelZero);
+  }
+}
+
+
+
+UPNG.encode.compress = function(bufs, w, h, ps, prms) // prms:  onlyBlend, minBits, forbidPlte
+{
+  //var time = Date.now();
+  var onlyBlend = prms[0], evenCrd = prms[1], forbidPrev = prms[2], minBits = prms[3], forbidPlte = prms[4];
+  
+  var ctype = 6, depth = 8, alphaAnd=255
+  
+  for(var j=0; j<bufs.length; j++)  {  // when not quantized, other frames can contain colors, that are not in an initial frame
+    var img = new Uint8Array(bufs[j]), ilen = img.length;
+    for(var i=0; i<ilen; i+=4) alphaAnd &= img[i+3];
+  }
+  var gotAlpha = (alphaAnd!=255);
+  
+  //console.log("alpha check", Date.now()-time);  time = Date.now();
+  
+  //var brute = gotAlpha && forGIF;   // brute : frames can only be copied, not "blended"
+  var frms = UPNG.encode.framize(bufs, w, h, onlyBlend, evenCrd, forbidPrev);
+  //console.log("framize", Date.now()-time);  time = Date.now();
+  
+  var cmap={}, plte=[], inds=[];  
+  
+  if(ps!=0) {
+    var nbufs = [];  for(var i=0; i<frms.length; i++) nbufs.push(frms[i].img.buffer);
+    
+    var abuf = UPNG.encode.concatRGBA(nbufs), qres = UPNG.quantize(abuf, ps);  
+    var cof = 0, bb = new Uint8Array(qres.abuf);
+    for(var i=0; i<frms.length; i++) {  var ti=frms[i].img, bln=ti.length;  inds.push(new Uint8Array(qres.inds.buffer, cof>>2, bln>>2));
+      for(var j=0; j<bln; j+=4) {  ti[j]=bb[cof+j];  ti[j+1]=bb[cof+j+1];  ti[j+2]=bb[cof+j+2];  ti[j+3]=bb[cof+j+3];  }    cof+=bln;  }
+    
+    for(var i=0; i<qres.plte.length; i++) plte.push(qres.plte[i].est.rgba);
+    //console.log("quantize", Date.now()-time);  time = Date.now();
+  }
+  else {
+    // what if ps==0, but there are <=256 colors?  we still need to detect, if the palette could be used
+    for(var j=0; j<frms.length; j++)  {  // when not quantized, other frames can contain colors, that are not in an initial frame
+      var frm = frms[j], img32 = new Uint32Array(frm.img.buffer), nw=frm.rect.width, ilen = img32.length;
+      var ind = new Uint8Array(ilen);  inds.push(ind);
+      for(var i=0; i<ilen; i++) {
+        var c = img32[i];
+        if     (i!=0 && c==img32[i- 1]) ind[i]=ind[i-1];
+        else if(i>nw && c==img32[i-nw]) ind[i]=ind[i-nw];
+        else {
+          var cmc = cmap[c];
+          if(cmc==null) {  cmap[c]=cmc=plte.length;  plte.push(c);  if(plte.length>=300) break;  }
+          ind[i]=cmc;
+        }
+      }
+    }
+    //console.log("make palette", Date.now()-time);  time = Date.now();
+  }
+  
+  var cc=plte.length; //console.log("colors:",cc);
+  if(cc<=256 && forbidPlte==false) {
+    if(cc<= 2) depth=1;  else if(cc<= 4) depth=2;  else if(cc<=16) depth=4;  else depth=8;
+    depth =  Math.max(depth, minBits);
+  }
+  
+  for(var j=0; j<frms.length; j++)
+  {
+    var frm = frms[j], nx=frm.rect.x, ny=frm.rect.y, nw=frm.rect.width, nh=frm.rect.height;
+    var cimg = frm.img, cimg32 = new Uint32Array(cimg.buffer);
+    var bpl = 4*nw, bpp=4;
+    if(cc<=256 && forbidPlte==false) {
+      bpl = Math.ceil(depth*nw/8);
+      var nimg = new Uint8Array(bpl*nh);
+      var inj = inds[j];
+      for(var y=0; y<nh; y++) {  var i=y*bpl, ii=y*nw;
+        if     (depth==8) for(var x=0; x<nw; x++) nimg[i+(x)   ]   =  (inj[ii+x]             );
+        else if(depth==4) for(var x=0; x<nw; x++) nimg[i+(x>>1)]  |=  (inj[ii+x]<<(4-(x&1)*4));
+        else if(depth==2) for(var x=0; x<nw; x++) nimg[i+(x>>2)]  |=  (inj[ii+x]<<(6-(x&3)*2));
+        else if(depth==1) for(var x=0; x<nw; x++) nimg[i+(x>>3)]  |=  (inj[ii+x]<<(7-(x&7)*1));
+      }
+      cimg=nimg;  ctype=3;  bpp=1;
+    }
+    else if(gotAlpha==false && frms.length==1) {  // some next "reduced" frames may contain alpha for blending
+      var nimg = new Uint8Array(nw*nh*3), area=nw*nh;
+      for(var i=0; i<area; i++) { var ti=i*3, qi=i*4;  nimg[ti]=cimg[qi];  nimg[ti+1]=cimg[qi+1];  nimg[ti+2]=cimg[qi+2];  }
+      cimg=nimg;  ctype=2;  bpp=3;  bpl=3*nw;
+    }
+    frm.img=cimg;  frm.bpl=bpl;  frm.bpp=bpp;
+  }
+  //console.log("colors => palette indices", Date.now()-time);  time = Date.now();
+  
+  return {ctype:ctype, depth:depth, plte:plte, frames:frms  };
+}
+UPNG.encode.framize = function(bufs,w,h,alwaysBlend,evenCrd,forbidPrev) {
+  /*  DISPOSE
+      - 0 : no change
+    - 1 : clear to transparent
+    - 2 : retstore to content before rendering (previous frame disposed)
+    BLEND
+    - 0 : replace
+    - 1 : blend
+  */
+  var frms = [];
+  for(var j=0; j<bufs.length; j++) {
+    var cimg = new Uint8Array(bufs[j]), cimg32 = new Uint32Array(cimg.buffer);
+    var nimg;
+    
+    var nx=0, ny=0, nw=w, nh=h, blend=alwaysBlend?1:0;
+    if(j!=0) {
+      var tlim = (forbidPrev || alwaysBlend || j==1 || frms[j-2].dispose!=0)?1:2, tstp = 0, tarea = 1e9;
+      for(var it=0; it<tlim; it++)
+      {
+        var pimg = new Uint8Array(bufs[j-1-it]), p32 = new Uint32Array(bufs[j-1-it]);
+        var mix=w,miy=h,max=-1,may=-1;
+        for(var y=0; y<h; y++) for(var x=0; x<w; x++) {
+          var i = y*w+x;
+          if(cimg32[i]!=p32[i]) {
+            if(x<mix) mix=x;  if(x>max) max=x;
+            if(y<miy) miy=y;  if(y>may) may=y;
+          }
+        }
+        if(max==-1) mix=miy=max=may=0;
+        if(evenCrd) {  if((mix&1)==1)mix--;  if((miy&1)==1)miy--;  }
+        var sarea = (max-mix+1)*(may-miy+1);
+        if(sarea<tarea) {
+          tarea = sarea;  tstp = it;
+          nx = mix; ny = miy; nw = max-mix+1; nh = may-miy+1;
+        }
+      }
+      
+      // alwaysBlend: pokud zjistím, že blendit nelze, nastavím předchozímu snímku dispose=1. Zajistím, aby obsahoval můj obdélník.
+      var pimg = new Uint8Array(bufs[j-1-tstp]);
+      if(tstp==1) frms[j-1].dispose = 2;
+      
+      nimg = new Uint8Array(nw*nh*4);
+      UPNG._copyTile(pimg,w,h, nimg,nw,nh, -nx,-ny, 0);
+      
+      blend =  UPNG._copyTile(cimg,w,h, nimg,nw,nh, -nx,-ny, 3) ? 1 : 0;
+      if(blend==1) UPNG.encode._prepareDiff(cimg,w,h,nimg,{x:nx,y:ny,width:nw,height:nh});
+      else         UPNG._copyTile(cimg,w,h, nimg,nw,nh, -nx,-ny, 0);
+      //UPNG._copyTile(cimg,w,h, nimg,nw,nh, -nx,-ny, blend==1?2:0);
+    }
+    else nimg = cimg.slice(0);  // img may be rewritten further ... don't rewrite input
+    
+    frms.push({rect:{x:nx,y:ny,width:nw,height:nh}, img:nimg, blend:blend, dispose:0});
+  }
+  
+  
+  if(alwaysBlend) for(var j=0; j<frms.length; j++) {
+    var frm = frms[j];  if(frm.blend==1) continue;
+    var r0 = frm.rect, r1 = frms[j-1].rect
+    var miX = Math.min(r0.x, r1.x), miY = Math.min(r0.y, r1.y);
+    var maX = Math.max(r0.x+r0.width, r1.x+r1.width), maY = Math.max(r0.y+r0.height, r1.y+r1.height);
+    var r = {x:miX, y:miY, width:maX-miX, height:maY-miY};
+    
+    frms[j-1].dispose = 1;
+    if(j-1!=0) 
+    UPNG.encode._updateFrame(bufs, w,h,frms, j-1,r, evenCrd);
+    UPNG.encode._updateFrame(bufs, w,h,frms, j  ,r, evenCrd);
+  }
+  var area = 0;
+  if(bufs.length!=1) for(var i=0; i<frms.length; i++) {
+    var frm = frms[i];
+    area += frm.rect.width*frm.rect.height;
+    //if(i==0 || frm.blend!=1) continue;
+    //var ob = new Uint8Array(
+    //console.log(frm.blend, frm.dispose, frm.rect);
+  }
+  //if(area!=0) console.log(area);
+  return frms;
+}
+UPNG.encode._updateFrame = function(bufs, w,h, frms, i, r, evenCrd) {
+  var U8 = Uint8Array, U32 = Uint32Array;
+  var pimg = new U8(bufs[i-1]), pimg32 = new U32(bufs[i-1]), nimg = i+1<bufs.length ? new U8(bufs[i+1]):null;
+  var cimg = new U8(bufs[i]), cimg32 = new U32(cimg.buffer);
+  
+  var mix=w,miy=h,max=-1,may=-1;
+  for(var y=0; y<r.height; y++) for(var x=0; x<r.width; x++) {
+    var cx = r.x+x, cy = r.y+y;
+    var j = cy*w+cx, cc = cimg32[j];
+    // no need to draw transparency, or to dispose it. Or, if writing the same color and the next one does not need transparency.
+    if(cc==0 || (frms[i-1].dispose==0 && pimg32[j]==cc && (nimg==null || nimg[j*4+3]!=0))/**/) {}
+    else {
+      if(cx<mix) mix=cx;  if(cx>max) max=cx;
+      if(cy<miy) miy=cy;  if(cy>may) may=cy;
+    }
+  }
+  if(max==-1) mix=miy=max=may=0;
+  if(evenCrd) {  if((mix&1)==1)mix--;  if((miy&1)==1)miy--;  }
+  r = {x:mix, y:miy, width:max-mix+1, height:may-miy+1};
+  
+  var fr = frms[i];  fr.rect = r;  fr.blend = 1;  fr.img = new Uint8Array(r.width*r.height*4);
+  if(frms[i-1].dispose==0) {
+    UPNG._copyTile(pimg,w,h, fr.img,r.width,r.height, -r.x,-r.y, 0);
+    UPNG.encode._prepareDiff(cimg,w,h,fr.img,r);
+    //UPNG._copyTile(cimg,w,h, fr.img,r.width,r.height, -r.x,-r.y, 2);
+  }
+  else
+    UPNG._copyTile(cimg,w,h, fr.img,r.width,r.height, -r.x,-r.y, 0);
+}
+UPNG.encode._prepareDiff = function(cimg, w,h, nimg, rec) {
+  UPNG._copyTile(cimg,w,h, nimg,rec.width,rec.height, -rec.x,-rec.y, 2);
+  /*
+  var n32 = new Uint32Array(nimg.buffer);
+  var og = new Uint8Array(rec.width*rec.height*4), o32 = new Uint32Array(og.buffer);
+  UPNG._copyTile(cimg,w,h, og,rec.width,rec.height, -rec.x,-rec.y, 0);
+  for(var i=4; i<nimg.length; i+=4) {
+    if(nimg[i-1]!=0 && nimg[i+3]==0 && o32[i>>>2]==o32[(i>>>2)-1]) {
+      n32[i>>>2]=o32[i>>>2];
+      //var j = i, c=p32[(i>>>2)-1];
+      //while(p32[j>>>2]==c) {  n32[j>>>2]=c;  j+=4;  }
+    }
+  }
+  for(var i=nimg.length-8; i>0; i-=4) {
+    if(nimg[i+7]!=0 && nimg[i+3]==0 && o32[i>>>2]==o32[(i>>>2)+1]) {
+      n32[i>>>2]=o32[i>>>2];
+      //var j = i, c=p32[(i>>>2)-1];
+      //while(p32[j>>>2]==c) {  n32[j>>>2]=c;  j+=4;  }
+    }
+  }*/
+}
+
+UPNG.encode._filterZero = function(img,h,bpp,bpl,data, filter, levelZero)
+{
+  var fls = [], ftry=[0,1,2,3,4];
+  if     (filter!=-1)             ftry=[filter];
+  else if(h*bpl>500000 || bpp==1) ftry=[0];
+  var opts;  if(levelZero) opts={level:0};
+  
+  var CMPR = (levelZero && UZIP!=null) ? UZIP : pako;
+  
+  for(var i=0; i<ftry.length; i++) {
+    for(var y=0; y<h; y++) UPNG.encode._filterLine(data, img, y, bpl, bpp, ftry[i]);
+    //var nimg = new Uint8Array(data.length);
+    //var sz = UZIP.F.deflate(data, nimg);  fls.push(nimg.slice(0,sz));
+    //var dfl = pako["deflate"](data), dl=dfl.length-4;
+    //var crc = (dfl[dl+3]<<24)|(dfl[dl+2]<<16)|(dfl[dl+1]<<8)|(dfl[dl+0]<<0);
+    //console.log(crc, UZIP.adler(data,2,data.length-6));
+    fls.push(CMPR["deflate"](data,opts));
+  }
+  var ti, tsize=1e9;
+  for(var i=0; i<fls.length; i++) if(fls[i].length<tsize) {  ti=i;  tsize=fls[i].length;  }
+  return fls[ti];
+}
+UPNG.encode._filterLine = function(data, img, y, bpl, bpp, type)
+{
+  var i = y*bpl, di = i+y, paeth = UPNG.decode._paeth
+  data[di]=type;  di++;
+
+  if(type==0) {
+    if(bpl<500) for(var x=0; x<bpl; x++) data[di+x] = img[i+x];
+    else data.set(new Uint8Array(img.buffer,i,bpl),di);
+  }
+  else if(type==1) {
+    for(var x=  0; x<bpp; x++) data[di+x] =  img[i+x];
+    for(var x=bpp; x<bpl; x++) data[di+x] = (img[i+x]-img[i+x-bpp]+256)&255;
+  }
+  else if(y==0) {
+    for(var x=  0; x<bpp; x++) data[di+x] = img[i+x];
+
+    if(type==2) for(var x=bpp; x<bpl; x++) data[di+x] = img[i+x];
+    if(type==3) for(var x=bpp; x<bpl; x++) data[di+x] = (img[i+x] - (img[i+x-bpp]>>1) +256)&255;
+    if(type==4) for(var x=bpp; x<bpl; x++) data[di+x] = (img[i+x] - paeth(img[i+x-bpp], 0, 0) +256)&255;
+  }
+  else {
+    if(type==2) { for(var x=  0; x<bpl; x++) data[di+x] = (img[i+x]+256 - img[i+x-bpl])&255;  }
+    if(type==3) { for(var x=  0; x<bpp; x++) data[di+x] = (img[i+x]+256 - (img[i+x-bpl]>>1))&255;
+            for(var x=bpp; x<bpl; x++) data[di+x] = (img[i+x]+256 - ((img[i+x-bpl]+img[i+x-bpp])>>1))&255;  }
+    if(type==4) { for(var x=  0; x<bpp; x++) data[di+x] = (img[i+x]+256 - paeth(0, img[i+x-bpl], 0))&255;
+            for(var x=bpp; x<bpl; x++) data[di+x] = (img[i+x]+256 - paeth(img[i+x-bpp], img[i+x-bpl], img[i+x-bpp-bpl]))&255;  }
+  }
+}
+
+UPNG.crc = {
+  table : ( function() {
+     var tab = new Uint32Array(256);
+     for (var n=0; n<256; n++) {
+      var c = n;
+      for (var k=0; k<8; k++) {
+        if (c & 1)  c = 0xedb88320 ^ (c >>> 1);
+        else        c = c >>> 1;
+      }
+      tab[n] = c;  }
+    return tab;  })(),
+  update : function(c, buf, off, len) {
+    for (var i=0; i<len; i++)  c = UPNG.crc.table[(c ^ buf[off+i]) & 0xff] ^ (c >>> 8);
+    return c;
+  },
+  crc : function(b,o,l)  {  return UPNG.crc.update(0xffffffff,b,o,l) ^ 0xffffffff;  }
+}
+
+
+UPNG.quantize = function(abuf, ps)
+{ 
+  var oimg = new Uint8Array(abuf), nimg = oimg.slice(0), nimg32 = new Uint32Array(nimg.buffer);
+  
+  var KD = UPNG.quantize.getKDtree(nimg, ps);
+  var root = KD[0], leafs = KD[1];
+  
+  var planeDst = UPNG.quantize.planeDst;
+  var sb = oimg, tb = nimg32, len=sb.length;
+    
+  var inds = new Uint8Array(oimg.length>>2);
+  for(var i=0; i<len; i+=4) {
+    var r=sb[i]*(1/255), g=sb[i+1]*(1/255), b=sb[i+2]*(1/255), a=sb[i+3]*(1/255);
+    
+    //  exact, but too slow :(
+    var nd = UPNG.quantize.getNearest(root, r, g, b, a);
+    //var nd = root;
+    //while(nd.left) nd = (planeDst(nd.est,r,g,b,a)<=0) ? nd.left : nd.right;
+    
+    inds[i>>2] = nd.ind;
+    tb[i>>2] = nd.est.rgba;
+  }
+  return {  abuf:nimg.buffer, inds:inds, plte:leafs  };
+}
+
+UPNG.quantize.getKDtree = function(nimg, ps, err) {
+  if(err==null) err = 0.0001;
+  var nimg32 = new Uint32Array(nimg.buffer);
+  
+  var root = {i0:0, i1:nimg.length, bst:null, est:null, tdst:0, left:null, right:null };  // basic statistic, extra statistic
+  root.bst = UPNG.quantize.stats(  nimg,root.i0, root.i1  );  root.est = UPNG.quantize.estats( root.bst );
+  var leafs = [root];
+  
+  while(leafs.length<ps)
+  {
+    var maxL = 0, mi=0;
+    for(var i=0; i<leafs.length; i++) if(leafs[i].est.L > maxL) {  maxL=leafs[i].est.L;  mi=i;  }
+    if(maxL<err) break;
+    var node = leafs[mi];
+    
+    var s0 = UPNG.quantize.splitPixels(nimg,nimg32, node.i0, node.i1, node.est.e, node.est.eMq255);
+    var s0wrong = (node.i0>=s0 || node.i1<=s0);
+    //console.log(maxL, leafs.length, mi);
+    if(s0wrong) {  node.est.L=0;  continue;  }
+    
+    
+    var ln = {i0:node.i0, i1:s0, bst:null, est:null, tdst:0, left:null, right:null };  ln.bst = UPNG.quantize.stats( nimg, ln.i0, ln.i1 );  
+    ln.est = UPNG.quantize.estats( ln.bst );
+    var rn = {i0:s0, i1:node.i1, bst:null, est:null, tdst:0, left:null, right:null };  rn.bst = {R:[], m:[], N:node.bst.N-ln.bst.N};
+    for(var i=0; i<16; i++) rn.bst.R[i] = node.bst.R[i]-ln.bst.R[i];
+    for(var i=0; i< 4; i++) rn.bst.m[i] = node.bst.m[i]-ln.bst.m[i];
+    rn.est = UPNG.quantize.estats( rn.bst );
+    
+    node.left = ln;  node.right = rn;
+    leafs[mi]=ln;  leafs.push(rn);
+  }
+  leafs.sort(function(a,b) {  return b.bst.N-a.bst.N;  });
+  for(var i=0; i<leafs.length; i++) leafs[i].ind=i;
+  return [root, leafs];
+}
+
+UPNG.quantize.getNearest = function(nd, r,g,b,a)
+{
+  if(nd.left==null) {  nd.tdst = UPNG.quantize.dist(nd.est.q,r,g,b,a);  return nd;  }
+  var planeDst = UPNG.quantize.planeDst(nd.est,r,g,b,a);
+  
+  var node0 = nd.left, node1 = nd.right;
+  if(planeDst>0) {  node0=nd.right;  node1=nd.left;  }
+  
+  var ln = UPNG.quantize.getNearest(node0, r,g,b,a);
+  if(ln.tdst<=planeDst*planeDst) return ln;
+  var rn = UPNG.quantize.getNearest(node1, r,g,b,a);
+  return rn.tdst<ln.tdst ? rn : ln;
+}
+UPNG.quantize.planeDst = function(est, r,g,b,a) {  var e = est.e;  return e[0]*r + e[1]*g + e[2]*b + e[3]*a - est.eMq;  }
+UPNG.quantize.dist     = function(q,   r,g,b,a) {  var d0=r-q[0], d1=g-q[1], d2=b-q[2], d3=a-q[3];  return d0*d0+d1*d1+d2*d2+d3*d3;  }
+
+UPNG.quantize.splitPixels = function(nimg, nimg32, i0, i1, e, eMq)
+{
+  var vecDot = UPNG.quantize.vecDot;
+  i1-=4;
+  var shfs = 0;
+  while(i0<i1)
+  {
+    while(vecDot(nimg, i0, e)<=eMq) i0+=4;
+    while(vecDot(nimg, i1, e)> eMq) i1-=4;
+    if(i0>=i1) break;
+    
+    var t = nimg32[i0>>2];  nimg32[i0>>2] = nimg32[i1>>2];  nimg32[i1>>2]=t;
+    
+    i0+=4;  i1-=4;
+  }
+  while(vecDot(nimg, i0, e)>eMq) i0-=4;
+  return i0+4;
+}
+UPNG.quantize.vecDot = function(nimg, i, e)
+{
+  return nimg[i]*e[0] + nimg[i+1]*e[1] + nimg[i+2]*e[2] + nimg[i+3]*e[3];
+}
+UPNG.quantize.stats = function(nimg, i0, i1){
+  var R = [0,0,0,0,  0,0,0,0,  0,0,0,0,  0,0,0,0];
+  var m = [0,0,0,0];
+  var N = (i1-i0)>>2;
+  for(var i=i0; i<i1; i+=4)
+  {
+    var r = nimg[i]*(1/255), g = nimg[i+1]*(1/255), b = nimg[i+2]*(1/255), a = nimg[i+3]*(1/255);
+    //var r = nimg[i], g = nimg[i+1], b = nimg[i+2], a = nimg[i+3];
+    m[0]+=r;  m[1]+=g;  m[2]+=b;  m[3]+=a;
+    
+    R[ 0] += r*r;  R[ 1] += r*g;  R[ 2] += r*b;  R[ 3] += r*a;  
+                   R[ 5] += g*g;  R[ 6] += g*b;  R[ 7] += g*a; 
+                                  R[10] += b*b;  R[11] += b*a;  
+                                                 R[15] += a*a;  
+  }
+  R[4]=R[1];  R[8]=R[2];  R[9]=R[6];  R[12]=R[3];  R[13]=R[7];  R[14]=R[11];
+  
+  return {R:R, m:m, N:N};
+}
+UPNG.quantize.estats = function(stats){
+  var R = stats.R, m = stats.m, N = stats.N;
+  
+  // when all samples are equal, but N is large (millions), the Rj can be non-zero ( 0.0003.... - precission error)
+  var m0 = m[0], m1 = m[1], m2 = m[2], m3 = m[3], iN = (N==0 ? 0 : 1/N);
+  var Rj = [
+    R[ 0] - m0*m0*iN,  R[ 1] - m0*m1*iN,  R[ 2] - m0*m2*iN,  R[ 3] - m0*m3*iN,  
+    R[ 4] - m1*m0*iN,  R[ 5] - m1*m1*iN,  R[ 6] - m1*m2*iN,  R[ 7] - m1*m3*iN,
+    R[ 8] - m2*m0*iN,  R[ 9] - m2*m1*iN,  R[10] - m2*m2*iN,  R[11] - m2*m3*iN,  
+    R[12] - m3*m0*iN,  R[13] - m3*m1*iN,  R[14] - m3*m2*iN,  R[15] - m3*m3*iN 
+  ];
+  
+  var A = Rj, M = UPNG.M4;
+  var b = [0.5,0.5,0.5,0.5], mi = 0, tmi = 0;
+  
+  if(N!=0)
+  for(var i=0; i<10; i++) {
+    b = M.multVec(A, b);  tmi = Math.sqrt(M.dot(b,b));  b = M.sml(1/tmi,  b);
+    if(Math.abs(tmi-mi)<1e-9) break;  mi = tmi;
+  } 
+  //b = [0,0,1,0];  mi=N;
+  var q = [m0*iN, m1*iN, m2*iN, m3*iN];
+  var eMq255 = M.dot(M.sml(255,q),b);
+  
+  return {  Cov:Rj, q:q, e:b, L:mi,  eMq255:eMq255, eMq : M.dot(b,q),
+        rgba: (((Math.round(255*q[3])<<24) | (Math.round(255*q[2])<<16) |  (Math.round(255*q[1])<<8) | (Math.round(255*q[0])<<0))>>>0)  };
+}
+UPNG.M4 = {
+  multVec : function(m,v) {
+      return [
+        m[ 0]*v[0] + m[ 1]*v[1] + m[ 2]*v[2] + m[ 3]*v[3],
+        m[ 4]*v[0] + m[ 5]*v[1] + m[ 6]*v[2] + m[ 7]*v[3],
+        m[ 8]*v[0] + m[ 9]*v[1] + m[10]*v[2] + m[11]*v[3],
+        m[12]*v[0] + m[13]*v[1] + m[14]*v[2] + m[15]*v[3]
+      ];
+  },
+  dot : function(x,y) {  return  x[0]*y[0]+x[1]*y[1]+x[2]*y[2]+x[3]*y[3];  },
+  sml : function(a,y) {  return [a*y[0],a*y[1],a*y[2],a*y[3]];  }
+}
+
+UPNG.encode.concatRGBA = function(bufs) {
+  var tlen = 0;
+  for(var i=0; i<bufs.length; i++) tlen += bufs[i].byteLength;
+  var nimg = new Uint8Array(tlen), noff=0;
+  for(var i=0; i<bufs.length; i++) {
+    var img = new Uint8Array(bufs[i]), il = img.length;
+    for(var j=0; j<il; j+=4) {  
+      var r=img[j], g=img[j+1], b=img[j+2], a = img[j+3];
+      if(a==0) r=g=b=0;
+      nimg[noff+j]=r;  nimg[noff+j+1]=g;  nimg[noff+j+2]=b;  nimg[noff+j+3]=a;  }
+    noff += il;
+  }
+  return nimg.buffer;
+}
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