2 lines
3.6 KiB
JavaScript
2 lines
3.6 KiB
JavaScript
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var q=Object.defineProperty;var U=Object.getOwnPropertyDescriptor;var j=Object.getOwnPropertyNames;var D=Object.prototype.hasOwnProperty;var $=(t,e)=>{for(var r in e)q(t,r,{get:e[r],enumerable:!0})},H=(t,e,r,n)=>{if(e&&typeof e=="object"||typeof e=="function")for(let s of j(e))!D.call(t,s)&&s!==r&&q(t,s,{get:()=>e[s],enumerable:!(n=U(e,s))||n.enumerable});return t};var O=t=>H(q({},"__esModule",{value:!0}),t);var _={};$(_,{ValidationError:()=>b,decode:()=>I,encode:()=>F,isBlurhashValid:()=>V});module.exports=O(_);var C=["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","#","$","%","*","+",",","-",".",":",";","=","?","@","[","]","^","_","{","|","}","~"],x=t=>{let e=0;for(let r=0;r<t.length;r++){let n=t[r],s=C.indexOf(n);e=e*83+s}return e},p=(t,e)=>{var r="";for(let n=1;n<=e;n++){let s=Math.floor(t)/Math.pow(83,e-n)%83;r+=C[Math.floor(s)]}return r};var h=t=>{let e=t/255;return e<=.04045?e/12.92:Math.pow((e+.055)/1.055,2.4)},M=t=>{let e=Math.max(0,Math.min(1,t));return e<=.0031308?Math.trunc(e*12.92*255+.5):Math.trunc((1.055*Math.pow(e,.4166666666666667)-.055)*255+.5)},S=t=>t<0?-1:1,d=(t,e)=>S(t)*Math.pow(Math.abs(t),e);var b=class extends Error{constructor(e){super(e),this.name="ValidationError",this.message=e}};var A=t=>{if(!t||t.length<6)throw new b("The blurhash string must be at least 6 characters");let e=x(t[0]),r=Math.floor(e/9)+1,n=e%9+1;if(t.length!==4+2*n*r)throw new b(`blurhash length mismatch: length is ${t.length} but it should be ${4+2*n*r}`)},V=t=>{try{A(t)}catch(e){return{result:!1,errorReason:e.message}}return{result:!0}},W=t=>{let e=t>>16,r=t>>8&255,n=t&255;return[h(e),h(r),h(n)]},k=(t,e)=>{let r=Math.floor(t/361),n=Math.floor(t/19)%19,s=t%19;return[d((r-9)/9,2)*e,d((n-9)/9,2)*e,d((s-9)/9,2)*e]},J=(t,e,r,n)=>{A(t),n=n|1;let s=x(t[0]),m=Math.floor(s/9)+1,f=s%9+1,i=(x(t[1])+1)/166,u=new Array(f*m);for(let o=0;o<u.length;o++)if(o===0){let l=x(t.substring(2,6));u[o]=W(l)}else{let l=x(t.substring(4+o*2,6+o*2));u[o]=k(l,i*n)}let c=e*4,a=new Uint8ClampedArray(c*r);for(let o=0;o<r;o++)for(let l=0;l<e;l++){let y=0,B=0,R=0;for(let w=0;w<m;w++)for(let P=0;P<f;P++){let G=Math.cos(Math.PI*l*P/e)*Math.cos(Math.PI*o*w/r),T=u[P+w*f];y+=T[0]*G,B+=T[1]*G,R+=T[2]*G}let N=M(y),z=M(B),L=M(R);a[4*l+0+o*c]=N,a[4*l+1+o*c]=z,a[4*l+2+o*c]=L,a[4*l+3+o*c]=255}return a},I=J;var E=4,K=(t,e,r,n)=>{let s=0,m=0,f=0,g=e*E;for(let u=0;u<e;u++){let c=E*u;for(let a=0;a<r;a++){let o=c+a*g,l=n(u,a);s+=l*h(t[o]),m+=l*h(t[o+1]),f+=l*h(t[o+2])}}let i=1/(e*r);return[s*i,m*i,f*i]},Q=t=>{let e=M(t[0]),r=M(t[1]),n=M(t[2]);return(e<<16)+(r<<8)+n},X=(t,e)=>{let r=Math.floor(Math.max(0,Math.min(18,Math.floor(d(t[0]/e,.5)*9+9.5)))),n=Math.floor(Math.max(0,Math.min(18,Math.floor(d(t[1]/e,.5)*9+9.5)))),s=Math.floor(Math.max(0,Math.min(18,Math.floor(d(t[2]/e,.5)*9+9.5))));return r*19*19+n*19+s},Z=(t,e,r,n,s)=>{if(n<1||n>9||s<1||s>9)throw new b("BlurHash must have between 1 and 9 components");if(e*r*4!==t.length)throw new b("Width and height must match the pixels array");let m=[];for(let a=0;a<s;a++)for(let o=0;o<n;o++){let l=o==0&&a==0?1:2,y=K(t,e,r,(B,R)=>l*Math.cos(Math.PI*o*B/e)*Math.cos(Math.PI*a*R/r));m.push(y)}let f=m[0],g=m.slice(1),i="",u=n-1+(s-1)*9;i+=p(u,1);let c;if(g.length>0){let a=Math.max(...g.map(l=>Math.max(...l))),o=Math.floor(Math.max(0,Math.min(82,Math.floor(a*166-.5))));c=(o+1)/166,i+=p(o,1)}else c=1,i+=p(0,1);return i+=p(Q(f),4),g.forEach(a=>{i+=p(X(a,c),2)}),i},F=Z;0&&(module.exports={ValidationError,decode,encode,isBlurhashValid});
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