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https://github.com/direct-img/vibegif.direct-img.link.git
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43 lines
2.7 KiB
JavaScript
43 lines
2.7 KiB
JavaScript
// renders gen/<section>/<subject>/<action>.js into public/<subject>/<action>.{webp,gif}
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// the section folder (bw, color, anime, manga, mini, minicolor) only picks where it shows in the gallery, it isn't part of the url
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// npm run gen renders only what's missing (published files never change by accident)
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// npm run gen -- cat/blink renders only the named ones, even if they already exist
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// a file can export rim=<px> to get a white sticker border, so black ink still shows on a black page
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// and invert=true to swap ink and paper (#111 <-> #fff), turning a black silhouette with a white rim into a white one with a dark rim
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import{createCanvas}from'@napi-rs/canvas'
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import sharp from'sharp'
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import{readdirSync as rd,existsSync as ex,mkdirSync as mk,statSync as st}from'fs'
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import{dirname,resolve}from'path'
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import{pathToFileURL as url}from'url'
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const S=256,redo=process.argv.slice(2)
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const walk=d=>rd(d,{withFileTypes:true}).flatMap(e=>e.isDirectory()?walk(`${d}/${e.name}`):`${d}/${e.name}`)
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const files=walk('gen').filter(f=>f.endsWith('.js')).sort(),ids=files.map(f=>f.split('/').slice(2).join('/').slice(0,-3))
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const dup=ids.find((d,i)=>ids.indexOf(d)!=i)
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if(dup)throw Error(`${dup} is in more than one section`)
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for(const[k,f]of files.entries()){
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const id=ids[k],o=`public/${id}`
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if(redo.length?!redo.includes(id):ex(o+'.webp')&&ex(o+'.gif'))continue
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const{default:draw,frames=16,delay=80,rim=0,invert=false}=await import(url(resolve(f)))
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const px=[...Array(frames)].map((_,i)=>{
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let c=createCanvas(S,S).getContext('2d')
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Object.assign(c,{lineWidth:7,lineCap:'round',lineJoin:'round',strokeStyle:'#111',fillStyle:'#fff'})
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draw(c,i/frames,i)
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if(rim){
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// white silhouette grown by rim px (copies shifted around rings 1..rim px out), then the frame on top
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const r=createCanvas(S,S).getContext('2d')
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for(let d=1;d<=rim;d++)for(let a=0;a<24;a++)r.drawImage(c.canvas,d*Math.cos(a*Math.PI/12),d*Math.sin(a*Math.PI/12))
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r.globalCompositeOperation='source-in';r.fillStyle='#fff';r.fillRect(0,0,S,S)
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r.globalCompositeOperation='source-over';r.drawImage(c.canvas,0,0);c=r
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}
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const b=Buffer.from(c.getImageData(0,0,S,S).data.buffer)
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// 17 and 255 trade places, the antialiased grays in between flip along, alpha is untouched
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if(invert)for(let j=0;j<b.length;j++)if(j%4<3)b[j]=Math.min(255,272-b[j])
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return b
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})
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mk(dirname(o),{recursive:true})
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const img=()=>sharp(Buffer.concat(px),{raw:{width:S,height:S*frames,channels:4,pageHeight:S}})
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await img().webp({lossless:true,effort:6,loop:0,delay}).toFile(o+'.webp')
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await img().gif({effort:10,loop:0,delay}).toFile(o+'.gif')
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console.log(`${id} webp ${st(o+'.webp').size}b gif ${st(o+'.gif').size}b`)
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}
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