2 lines
3.1 KiB
JavaScript
2 lines
3.1 KiB
JavaScript
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var q=["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],l=q.indexOf(n);e=e*83+l}return e},p=(t,e)=>{var r="";for(let n=1;n<=e;n++){let l=Math.floor(t)/Math.pow(83,e-n)%83;r+=q[Math.floor(l)]}return r};var f=t=>{let e=t/255;return e<=.04045?e/12.92:Math.pow((e+.055)/1.055,2.4)},h=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)},F=t=>t<0?-1:1,M=(t,e)=>F(t)*Math.pow(Math.abs(t),e);var d=class extends Error{constructor(e){super(e),this.name="ValidationError",this.message=e}};var C=t=>{if(!t||t.length<6)throw new d("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 d(`blurhash length mismatch: length is ${t.length} but it should be ${4+2*n*r}`)},N=t=>{try{C(t)}catch(e){return{result:!1,errorReason:e.message}}return{result:!0}},z=t=>{let e=t>>16,r=t>>8&255,n=t&255;return[f(e),f(r),f(n)]},L=(t,e)=>{let r=Math.floor(t/361),n=Math.floor(t/19)%19,l=t%19;return[M((r-9)/9,2)*e,M((n-9)/9,2)*e,M((l-9)/9,2)*e]},U=(t,e,r,n)=>{C(t),n=n|1;let l=x(t[0]),m=Math.floor(l/9)+1,b=l%9+1,i=(x(t[1])+1)/166,u=new Array(b*m);for(let o=0;o<u.length;o++)if(o===0){let a=x(t.substring(2,6));u[o]=z(a)}else{let a=x(t.substring(4+o*2,6+o*2));u[o]=L(a,i*n)}let c=e*4,s=new Uint8ClampedArray(c*r);for(let o=0;o<r;o++)for(let a=0;a<e;a++){let y=0,B=0,R=0;for(let w=0;w<m;w++)for(let P=0;P<b;P++){let G=Math.cos(Math.PI*a*P/e)*Math.cos(Math.PI*o*w/r),T=u[P+w*b];y+=T[0]*G,B+=T[1]*G,R+=T[2]*G}let V=h(y),I=h(B),E=h(R);s[4*a+0+o*c]=V,s[4*a+1+o*c]=I,s[4*a+2+o*c]=E,s[4*a+3+o*c]=255}return s},j=U;var A=4,D=(t,e,r,n)=>{let l=0,m=0,b=0,g=e*A;for(let u=0;u<e;u++){let c=A*u;for(let s=0;s<r;s++){let o=c+s*g,a=n(u,s);l+=a*f(t[o]),m+=a*f(t[o+1]),b+=a*f(t[o+2])}}let i=1/(e*r);return[l*i,m*i,b*i]},$=t=>{let e=h(t[0]),r=h(t[1]),n=h(t[2]);return(e<<16)+(r<<8)+n},H=(t,e)=>{let r=Math.floor(Math.max(0,Math.min(18,Math.floor(M(t[0]/e,.5)*9+9.5)))),n=Math.floor(Math.max(0,Math.min(18,Math.floor(M(t[1]/e,.5)*9+9.5)))),l=Math.floor(Math.max(0,Math.min(18,Math.floor(M(t[2]/e,.5)*9+9.5))));return r*19*19+n*19+l},O=(t,e,r,n,l)=>{if(n<1||n>9||l<1||l>9)throw new d("BlurHash must have between 1 and 9 components");if(e*r*4!==t.length)throw new d("Width and height must match the pixels array");let m=[];for(let s=0;s<l;s++)for(let o=0;o<n;o++){let a=o==0&&s==0?1:2,y=D(t,e,r,(B,R)=>a*Math.cos(Math.PI*o*B/e)*Math.cos(Math.PI*s*R/r));m.push(y)}let b=m[0],g=m.slice(1),i="",u=n-1+(l-1)*9;i+=p(u,1);let c;if(g.length>0){let s=Math.max(...g.map(a=>Math.max(...a))),o=Math.floor(Math.max(0,Math.min(82,Math.floor(s*166-.5))));c=(o+1)/166,i+=p(o,1)}else c=1,i+=p(0,1);return i+=p($(b),4),g.forEach(s=>{i+=p(H(s,c),2)}),i},S=O;export{d as ValidationError,j as decode,S as encode,N as isBlurhashValid};
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