forked from olcxjas-softworks/LarpixClient
2 lines
1.8 KiB
JavaScript
2 lines
1.8 KiB
JavaScript
import{parseGIF as e,decompressFrames as t}from"gifuct-js";class a{url;parseGIF;constructor(e){this.url=e}async decode(){const t=await this.fetchImageData(this.url);return this.parseGIF=e(t),this.validateAndFixFrame(this.parseGIF),this.parseGIF}async decompressFrames(){this.parseGIF||await this.decode();const e=await t(this.parseGIF,!0);return{frames:this.generate2ImageData(e),delays:e.map((e=>e.delay)),parsedFrames:e}}validateAndFixFrame=e=>{let t=null;for(const a of e.frames)t=a.gce?a.gce:t,"image"in a&&!("gce"in a)&&(a.gce=t)};generate2ImageData(e){return e.map((e=>{const t=e?.dims,a=new ImageData(t.width,t.height);return a.data.set(e.patch),a}))}generate2ImageDataWithPixelsModified(e,t){return e.map(((e,a)=>{t[a];const r=this.parseGIF.lsd,s=new ImageData(r.width,r.height);return s.data.set(new Uint8ClampedArray(e)),s}))}fetchImageData(e){return new Promise(((t,a)=>{const r=new XMLHttpRequest;r.open("GET",e,!0),r.responseType="arraybuffer",r.onload=e=>{if(!(e.target instanceof XMLHttpRequest))return;if(200!==e.target.status&&304!==e.target.status)return void a("Status Error: "+e.target.status);let r=e.target.response;r.toString().indexOf("ArrayBuffer")>0&&(r=new Uint8Array(r)),t(r)},r.onerror=e=>{a(e)},r.send()}))}handlePixels(e){const t=this.parseGIF.lsd,a=t.width*t.height*4,r=[];for(let s=0;s<e.length;++s){const i=e[s],n=0===s||2===e[s-1].disposalType?new Uint8ClampedArray(a):r[s-1].slice();r.push(this.putPixels(n,i,t))}return r}putPixels(e,t,a){if(!t.dims)return e;const{width:r,height:s,top:i,left:n}=t.dims,o=i*a.width+n;for(let i=0;i<s;i++)for(let s=0;s<r;s++){const n=i*r+s,d=t.pixels[n],h=o+i*a.width+s,l=t.colorTable[d]||[0,0,0];d===t.transparentIndex?(e[4*h]=0,e[4*h+1]=0,e[4*h+2]=0,e[4*h+3]=0):(e[4*h]=l[0],e[4*h+1]=l[1],e[4*h+2]=l[2],e[4*h+3]=255)}return e}}export{a as Decoder};
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