@blameitonyourisp/blurrid/dist/package/worker.js

Generate and render blurred placeholders for lazy loaded images.

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new e({name:"BitBufferError",message:"Source bits exceed bits available in target buffer","source-bits":s,"target-bits":o});for(let e=0;e<s;e++)t.write(this.#f(1,{offset:r+e}),{size:1,offset:i+e});return t}toString(){let e="",t=0,i=0;const r=new Uint8Array(this.#i);for(let a=0;a<3*Math.ceil(this.byteLength/3);a++){i=(i|(r[a]||0)<<16-8*t)>>>0,t=++t%3,t||(e+=n.#u(i),i=0)}return e}#o(){const e={writeable:!0,offset:this.#s},t=(i,{size:r=n.#h(i),offset:a=e.offset,signed:s=!1}={})=>{if(e.writeable){const t=Math.abs(i),h=this.bitLength-a;e.writeable=!(!s&&i<0)&&(!(n.#h(t)>r)&&(!!Number.isInteger(t)&&(!(r<0||r>32)&&!(r+(s?1:0)>h))))}return e.offset+=r,{append:t,get isWriteable(){return e.writeable}}};return{append:t,get isWriteable(){return e.writeable}}}#l(e,{size:t=n.#h(e),offset:i=this.#s,signed:r=!1}={}){const a=Math.abs(e),{view:s,byteLength:h,subBit:o}=this.#g(t,i);for(let e=0;e<h;e++){const i=s.getUint8(e);let r=0;for(let s=0;s<8;s++){const 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h{#b;#w;#p;#z;constructor(t){const{luma:i,chromaBlue:r,chromaRed:a}=t.match(/^(?<luma>[0-7]):(?<chromaBlue>[0-7]):(?<chromaRed>[0-7])$/)?.groups||{};if(!i||!r||!a)throw new e({name:"SubsamplingError",message:'Must be of form "x:y:z", digits from 0-7 inclusive',"subsampling-string":t});this.#b=parseInt(i),this.#w=parseInt(r),this.#p=parseInt(a),this.#z=this.#b+this.#w+this.#p}key(e){const t=e%this.#z;return t<this.#b?"luma":t<this.#b+this.#w?"chromaBlue":"chromaRed"}get luma(){return this.#b}get chromaBlue(){return this.#w}get chromaRed(){return this.#p}}function*o(e,t){const i=Array.from(Array.from({length:e}),(()=>Array.from({length:t}).fill(0)));let[r,a]=[0,0];for(;;)if(i[r][a]=yield i,0===a||r===e-1){const i=r+a+1;if(i>e+t-1)break;a=r>=t-1?t-1:r+1,r=i-a}else a--,r++}const l=(e,t=0,i=255,r=!0)=>(r&&(e=Math.round(e),t=Math.ceil(t),i=Math.floor(i)),Math.max(t,Math.min(i,e))),d=(e,t,i)=>{const r=[];for(let a=0;a<i.sample.width;a++){const i=e[a];r.push(u(i,t.y))}return u(r,t.x)},f=e=>{for(;e>=2*Math.PI;)e-=2*Math.PI;return e>Math.PI&&(e=2*Math.PI-e),e>Math.PI/2?5*(e=(e-Math.PI)*(e-Math.PI))/(e+Math.PI*Math.PI)-1:1-5*(e*=e)/(e+Math.PI*Math.PI)},u=(e,t)=>{let i=0;for(let r=0;r<e.length;r++){let a=e[r]*f((2*t+1)*Math.PI*r/(2*e.length));a*=0===r?Math.SQRT1_2:1,i+=a}return i*=Math.sqrt(2/e.length),i=Math.round(i),i},g=0,c=48,m=57,b=8;class w{#P;#i;#R;#S;constructor(t){if(!t.match(/^[A-Za-z0-9\-_]{16,}$/))throw new e({name:"BlurridDecoderError",message:"String minimum 16 url-safe base 64 encoded chars","serialized-dct":t});this.#P=t,this.#i=n.from(t),this.#R=new s(this.#M()),this.#S=this.#y()}toImageData(){const{luma:t,chromaBlue:i,chromaRed:r}=this.#S;return((e,t=255)=>{const i=[];for(let n=0;n<e.length;n+=3){const{red:h,green:o,blue:d}=(r=e[n],a=e[n+1],s=e[n+2],r=l(r),a=l(a),s=l(s),a-=128,{red:l(r+1.4*(s-=128)),green:l(r-.34*a-.71*s),blue:l(r+1.77*a)});i.push(h,o,d,t)}var r,a,s;return i})((t=>{const 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e=this.#v();let[t,i,r]=e.next().value;for(this.#i.readPointer=m,this.#i.lastReadSize=b;;){const a=this.#i.readRelative({signed:!0});if(isNaN(a))break;[t,i,r]=e.next(a).value}return{luma:t,chromaBlue:i,chromaRed:r}}#v(){return function*(e,t,i){const r={luma:o(e,t),chromaBlue:o(e,t),chromaRed:o(e,t)},a=[r.luma.next().value,r.chromaBlue.next().value,r.chromaRed.next().value];let s=0;do{const e=yield a,t=i.key(s),n=r[t].next(e);if(n.done)break;"luma"===t?a[0]=n.value:"chromaBlue"===t?a[1]=n.value:a[2]=n.value}while(++s)}(this.#R.sample.width,this.#R.sample.height,this.#B())}get serializedDct(){return this.#P}get metadata(){return this.#R}get coefficients(){return this.#S}}onmessage=e=>{const t=new w(e.data.serializedDct);t.metadata.resize(e.data.width);const i=new ImageData(new Uint8ClampedArray(t.toImageData()),t.metadata.image.width,t.metadata.image.height);postMessage({imageData:i})};