Manga Reader: lector web autoalojado con modo libro 3D y estante

2026-11-06 09:42:34 -06:00
commit e40127265f
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+// Portadas en HD: cada portada que se sirve (de la fuente o la cover.jpg de una descarga) se encola para
+// reescalarla con Real-ESRGAN (×4 si es pequeña, ×2 si no). Mientras tanto se sirve la original con
+// caché corta; en cuanto existe la versión HD se sirve esa. Caché en <DATA_DIR>/covers/<hash>.webp.
+// Los banners de la ficha pasan por lo mismo, pero se reescalan siempre: se ven a todo el ancho de la pantalla.
+import fs from 'node:fs'
+import os from 'node:os'
+import path from 'node:path'
+import crypto from 'node:crypto'
+import { BIN, MODELS, MODEL, run } from './upscale.js'
+
+const MAX_QUEUE = 300
+const X4_MAX_SIDE = 400
+const MAX_SIDE = 1600 // más grande ya no hace falta reescalarla
+const WEBP_QUALITY = 88
+const BANNER_X4_MAX_WIDTH = 1000
+
+// Ancho/alto de un JPEG, PNG o WebP sin decodificarlo (null si no se reconoce).
+export function imageSize(b) {
+  if (b.length > 24 && b.readUInt32BE(0) === 0x89504e47) return { type: 'png', w: b.readUInt32BE(16), h: b.readUInt32BE(20) }
+  if (b.length > 30 && b.toString('latin1', 0, 4) === 'RIFF' && b.toString('latin1', 8, 12) === 'WEBP') {
+    const f = b.toString('latin1', 12, 16)
+    if (f === 'VP8 ') return { type: 'webp', w: b.readUInt16LE(26) & 0x3fff, h: b.readUInt16LE(28) & 0x3fff }
+    if (f === 'VP8L') { const n = b.readUInt32LE(21); return { type: 'webp', w: (n & 0x3fff) + 1, h: ((n >> 14) & 0x3fff) + 1 } }
+    if (f === 'VP8X') return { type: 'webp', w: b.readUIntLE(24, 3) + 1, h: b.readUIntLE(27, 3) + 1 }
+    return null
+  }
+  if (b[0] === 0xff && b[1] === 0xd8) {
+    for (let i = 2; i + 9 < b.length;) {
+      if (b[i] !== 0xff) { i++; continue }
+      const marker = b[i + 1]
+      if (marker === 0xd8 || (marker >= 0xd0 && marker <= 0xd7) || marker === 0x01 || marker === 0xff) { i += marker === 0xff ? 1 : 2; continue }
+      const len = b.readUInt16BE(i + 2)
+      if (marker >= 0xc0 && marker <= 0xcf && ![0xc4, 0xc8, 0xcc].includes(marker)) return { type: 'jpg', w: b.readUInt16BE(i + 7), h: b.readUInt16BE(i + 5) }
+      i += 2 + len
+    }
+  }
+  return null
+}
+
+export function setupCovers({ DATA_DIR, upscale }) {
+  const DIR = path.join(DATA_DIR, 'covers')
+  fs.mkdirSync(DIR, { recursive: true })
+  const fileOf = key => path.join(DIR, `${crypto.createHash('sha256').update(key).digest('hex').slice(0, 32)}.webp`)
+  const queue = [] // { key, buf }
+  const pending = new Set()
+  const failed = new Set() // no reintentar hasta reiniciar
+
+  // Si ya hay versión HD, la envía y devuelve true.
+  function sendCached(res, key) {
+    if (!upscale.available()) return false
+    const f = fileOf(key)
+    if (!fs.existsSync(f)) return false
+    res.writeHead(200, { 'Content-Type': 'image/webp', 'Cache-Control': 'private, max-age=2592000, immutable' })
+    fs.createReadStream(f).pipe(res)
+    return true
+  }
+  // Cabecera de caché para la original mientras no hay HD (corta, para que el navegador pida luego la HD).
+  // Un banner no se guarda: en la siguiente visita ya se ve el reescalado.
+  const pendingCache = (banner = false) => (!upscale.available() ? 'private, max-age=604800, immutable' : banner ? 'no-store' : 'private, max-age=300')
+
+  // ¿Falta generar esta imagen? (para no descargarla si no hace falta)
+  const wants = key => upscale.available() && !pending.has(key) && !failed.has(key) && queue.length < MAX_QUEUE && !fs.existsSync(fileOf(key))
+  function enqueue(key, buf, banner = false) {
+    if (!wants(key)) return
+    pending.add(key)
+    queue.push({ key, buf, banner })
+    pump()
+  }
+
+  async function processOne({ key, buf, banner }) {
+    const size = imageSize(buf)
+    if (!size) throw new Error('formato no reconocido')
+    const work = fs.mkdtempSync(path.join(os.tmpdir(), 'cover-'))
+    try {
+      const out = path.join(work, 'out.png')
+      const tmp = `${fileOf(key)}.tmp`
+      if (!banner && Math.max(size.w, size.h) > MAX_SIDE) {
+        // Ya es grande: solo se recomprime para no volver a intentarlo.
+        const inp = path.join(work, `in.${size.type}`)
+        fs.writeFileSync(inp, buf)
+        if (size.type === 'webp') fs.copyFileSync(inp, tmp)
+        else await run('cwebp', ['-quiet', '-q', String(WEBP_QUALITY), inp, '-o', tmp])
+      } else {
+        const inp = path.join(work, `in.${size.type}`)
+        fs.writeFileSync(inp, buf)
+        const small = banner ? size.w < BANNER_X4_MAX_WIDTH : Math.max(size.w, size.h) <= X4_MAX_SIDE
+        const scale = small && fs.existsSync(path.join(MODELS, `${MODEL}-x4.bin`)) ? 4 : 2
+        await run(BIN, ['-i', inp, '-o', out, '-m', MODELS, '-n', MODEL, '-s', String(scale), '-f', 'png'])
+        await run('cwebp', ['-quiet', '-q', String(WEBP_QUALITY), '-m', '4', '-mt', out, '-o', tmp])
+      }
+      fs.renameSync(tmp, fileOf(key))
+    } finally {
+      fs.rmSync(work, { recursive: true, force: true })
+    }
+  }
+
+  let pumping = false
+  async function pump() {
+    if (pumping) return
+    pumping = true
+    try {
+      let n = 0
+      const t = Date.now()
+      while (queue.length) {
+        const job = queue.shift()
+        try { await processOne(job); n++ } catch (e) { failed.add(job.key); console.warn('Portada HD:', e.message) } finally { pending.delete(job.key) }
+      }
+      if (n) console.log(`Portadas HD: ${n} en ${Math.round((Date.now() - t) / 1000)} s`)
+    } finally {
+      pumping = false
+    }
+  }
+
+  return { sendCached, wants, enqueue, pendingCache, pendingCount: () => pending.size }
+}