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2 lines
13 KiB
JavaScript
2 lines
13 KiB
JavaScript
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a,o,i,s,f,c,u,l,h,g,P=r.quantizationTable,T=t;for(g=0;g<64;g++)T[g]=e[g]*P[g];for(g=0;g<8;++g){var C=8*g;0!==T[1+C]||0!==T[2+C]||0!==T[3+C]||0!==T[4+C]||0!==T[5+C]||0!==T[6+C]||0!==T[7+C]?(a=w*T[0+C]+128>>8,o=w*T[4+C]+128>>8,i=T[2+C],s=T[6+C],f=k*(T[1+C]-T[7+C])+128>>8,l=k*(T[1+C]+T[7+C])+128>>8,c=T[3+C]<<4,u=T[5+C]<<4,h=a-o+1>>1,a=a+o+1>>1,o=h,h=i*y+s*m+128>>8,i=i*m-s*y+128>>8,s=h,h=f-u+1>>1,f=f+u+1>>1,u=h,h=l+c+1>>1,c=l-c+1>>1,l=h,h=a-s+1>>1,a=a+s+1>>1,s=h,h=o-i+1>>1,o=o+i+1>>1,i=h,h=f*d+l*b+2048>>12,f=f*b-l*d+2048>>12,l=h,h=c*p+u*v+2048>>12,c=c*v-u*p+2048>>12,u=h,T[0+C]=a+l,T[7+C]=a-l,T[1+C]=o+u,T[6+C]=o-u,T[2+C]=i+c,T[5+C]=i-c,T[3+C]=s+f,T[4+C]=s-f):(h=w*T[0+C]+512>>10,T[0+C]=h,T[1+C]=h,T[2+C]=h,T[3+C]=h,T[4+C]=h,T[5+C]=h,T[6+C]=h,T[7+C]=h)}for(g=0;g<8;++g){var x=g;0!==T[8+x]||0!==T[16+x]||0!==T[24+x]||0!==T[32+x]||0!==T[40+x]||0!==T[48+x]||0!==T[56+x]?(a=w*T[0+x]+2048>>12,o=w*T[32+x]+2048>>12,i=T[16+x],s=T[48+x],f=k*(T[8+x]-T[56+x])+2048>>12,l=k*(T[8+x]+T[56+x])+2048>>12,c=T[24+x],u=T[40+x],h=a-o+1>>1,a=a+o+1>>1,o=h,h=i*y+s*m+2048>>12,i=i*m-s*y+2048>>12,s=h,h=f-u+1>>1,f=f+u+1>>1,u=h,h=l+c+1>>1,c=l-c+1>>1,l=h,h=a-s+1>>1,a=a+s+1>>1,s=h,h=o-i+1>>1,o=o+i+1>>1,i=h,h=f*d+l*b+2048>>12,f=f*b-l*d+2048>>12,l=h,h=c*p+u*v+2048>>12,c=c*v-u*p+2048>>12,u=h,T[0+x]=a+l,T[56+x]=a-l,T[8+x]=o+u,T[48+x]=o-u,T[16+x]=i+c,T[40+x]=i-c,T[24+x]=s+f,T[32+x]=s-f):(h=w*t[g+0]+8192>>14,T[0+x]=h,T[8+x]=h,T[16+x]=h,T[24+x]=h,T[32+x]=h,T[40+x]=h,T[48+x]=h,T[56+x]=h)}for(g=0;g<64;++g){var O=128+(T[g]+8>>4);n[g]=O<0?0:O>255?255:O}}for(var c=0;c<a;c++){for(var u=c<<3,l=0;l<8;l++)n.push(new Uint8Array(o));for(var h=0;h<t;h++){f(r.blocks[c][h],s,i);for(var g=0,P=h<<3,T=0;T<8;T++)for(var C=n[u+T],x=0;x<8;x++)C[P+x]=s[g++]}}return n}var C=function(){function e(){f(this,e),this.jfif=null,this.adobe=null,this.quantizationTables=[],this.huffmanTablesAC=[],this.huffmanTablesDC=[],this.resetFrames()}return u(e,[{key:"resetFrames",value:function(){this.frames=[]}},{key:"parse",value:function(e){var r=0;function n(){var n=e[r]<<8|e[r+1];return r+=2,n}function t(e){var r,n,t=0,a=0;for(n in e.components)e.components.hasOwnProperty(n)&&(t<(r=e.components[n]).h&&(t=r.h),a<r.v&&(a=r.v));var o=Math.ceil(e.samplesPerLine/8/t),i=Math.ceil(e.scanLines/8/a);for(n in e.components)if(e.components.hasOwnProperty(n)){r=e.components[n];for(var s=Math.ceil(Math.ceil(e.samplesPerLine/8)*r.h/t),f=Math.ceil(Math.ceil(e.scanLines/8)*r.v/a),c=o*r.h,u=i*r.v,l=[],h=0;h<u;h++){for(var v=[],p=0;p<c;p++)v.push(new Int32Array(64));l.push(v)}r.blocksPerLine=s,r.blocksPerColumn=f,r.blocks=l}e.maxH=t,e.maxV=a,e.mcusPerLine=o,e.mcusPerColumn=i}var a,o,i=n();if(65496!==i)throw new Error("SOI not found");for(i=n();65497!==i;){switch(i){case 65280:break;case 65504:case 65505:case 65506:case 65507:case 65508:case 65509:case 65510:case 65511:case 65512:case 65513:case 65514:case 65515:case 65516:case 65517:case 65518:case 65519:case 65534:var s=(a=void 0,o=void 0,a=n(),o=e.subarray(r,r+a-2),r+=o.length,o);65504===i&&74===s[0]&&70===s[1]&&73===s[2]&&70===s[3]&&0===s[4]&&(this.jfif={version:{major:s[5],minor:s[6]},densityUnits:s[7],xDensity:s[8]<<8|s[9],yDensity:s[10]<<8|s[11],thumbWidth:s[12],thumbHeight:s[13],thumbData:s.subarray(14,14+3*s[12]*s[13])}),65518===i&&65===s[0]&&100===s[1]&&111===s[2]&&98===s[3]&&101===s[4]&&0===s[5]&&(this.adobe={version:s[6],flags0:s[7]<<8|s[8],flags1:s[9]<<8|s[10],transformCode:s[11]});break;case 65499:for(var f=n()+r-2;r<f;){var c=e[r++],u=new Int32Array(64);if(c>>4==0)for(var l=0;l<64;l++){u[h[l]]=e[r++]}else{if(c>>4!=1)throw new Error("DQT: invalid table spec");for(var v=0;v<64;v++){u[h[v]]=n()}}this.quantizationTables[15&c]=u}break;case 65472:case 65473:case 65474:n();for(var p={extended:65473===i,progressive:65474===i,precision:e[r++],scanLines:n(),samplesPerLine:n(),components:{},componentsOrder:[]},b=e[r++],d=void 0,m=0;m<b;m++){d=e[r];var y=e[r+1]>>4,w=15&e[r+1],k=e[r+2];p.componentsOrder.push(d),p.components[d]={h:y,v:w,quantizationIdx:k},r+=3}t(p),this.frames.push(p);break;case 65476:for(var T=n(),C=2;C<T;){for(var x=e[r++],O=new Uint8Array(16),A=0,E=0;E<16;E++,r++)O[E]=e[r],A+=O[E];for(var L=new Uint8Array(A),j=0;j<A;j++,r++)L[j]=e[r];C+=17+A,x>>4==0?this.huffmanTablesDC[15&x]=g(O,L):this.huffmanTablesAC[15&x]=g(O,L)}break;case 65501:n(),this.resetInterval=n();break;case 65498:n();for(var I=e[r++],S=[],D=this.frames[0],R=0;R<I;R++){var U=D.components[e[r++]],q=e[r++];U.huffmanTableDC=this.huffmanTablesDC[q>>4],U.huffmanTableAC=this.huffmanTablesAC[15&q],S.push(U)}var z=e[r++],_=e[r++],M=e[r++],B=P(e,r,D,S,this.resetInterval,z,_,M>>4,15&M);r+=B;break;case 65535:255!==e[r]&&r--;break;default:if(255===e[r-3]&&e[r-2]>=192&&e[r-2]<=254){r-=3;break}throw new Error("unknown JPEG marker ".concat(i.toString(16)))}i=n()}}},{key:"getResult",value:function(){var e=this.frames;if(0===this.frames.length)throw new Error("no frames were decoded");this.frames.length>1&&console.warn("more than one frame is not supported");for(var r=0;r<this.frames.length;r++)for(var n=this.frames[r].components,t=0,a=Object.keys(n);t<a.length;t++){var o=a[t];n[o].quantizationTable=this.quantizationTables[n[o].quantizationIdx],delete n[o].quantizationIdx}for(var i=e[0],s=i.components,f=i.componentsOrder,c=[],u=i.samplesPerLine,l=i.scanLines,h=0;h<f.length;h++){var v=s[f[h]];c.push({lines:T(0,v),scaleX:v.h/i.maxH,scaleY:v.v/i.maxV})}for(var p=new Uint8Array(u*l*c.length),b=0,d=0;d<l;++d)for(var m=0;m<u;++m)for(var y=0;y<c.length;++y){var w=c[y];p[b]=w.lines[0|d*w.scaleY][0|m*w.scaleX],++b}return p}}]),e}(),x=function(e){!function(e,r){if("function"!=typeof r&&null!==r)throw new TypeError("Super expression must either be null or a function");e.prototype=Object.create(r&&r.prototype,{constructor:{value:e,writable:!0,configurable:!0}}),Object.defineProperty(e,"prototype",{writable:!1}),r&&a(e,r)}(n,e);var r=o(n);function n(e){var t;return f(this,n),(t=r.call(this)).reader=new C,e.JPEGTables&&t.reader.parse(e.JPEGTables),t}return u(n,[{key:"decodeBlock",value:function(e){return this.reader.resetFrames(),this.reader.parse(new Uint8Array(e)),this.reader.getResult().buffer}}]),n}(t.Z)}}]);
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