City-Lifeline-Cockpit/.scratch/lanhu-cockpit-asset-replacement/research/download-v2-assets.mjs

// 下载新版全部切图到 design-archive-v2/，按 PNG 实际像素尺寸匹配回导出图层
import { readFileSync, writeFileSync, readdirSync, mkdirSync } from 'node:fs'
import { createHash } from 'node:crypto'
import { join } from 'node:path'

const raw = '.scratch/lanhu-cockpit-asset-replacement/research/raw-v2'
const outDir = '.scratch/lanhu-cockpit-asset-replacement/design-archive-v2'
mkdirSync(outDir, { recursive: true })

const files = readdirSync(raw).filter((f) => /^desktop-\d+\.json$/.test(f)).sort()

function pngSize(buf) {
    if (buf.length < 24 || buf.readUInt32BE(0) !== 0x89504e47) return null
    return { w: buf.readUInt32BE(16), h: buf.readUInt32BE(20) }
}

const perArtboard = []
for (const file of files) {
    const j = JSON.parse(readFileSync(join(raw, file), 'utf8'))
    const ab = j.artboard
    const exported = []
    ;(function walk(node, path) {
        const p = path ? `${path}/${node.name}` : node.name
        if (node.hasExportImage) exported.push({ path: p, w: Math.round(node.frame?.width ?? 0), h: Math.round(node.frame?.height ?? 0), type: node.type })
        for (const ch of node.layers || []) walk(ch, p)
    })(ab, '')
    perArtboard.push({ artboard: ab.name, exported, assets: j.assets || [] })
}

const index = []
for (const { artboard, exported, assets } of perArtboard) {
    const pngs = []
    for (let i = 0; i < assets.length; i++) {
        const url = assets[i]
        if (!/\.png($|\?)/i.test(url)) continue
        const res = await fetch(url)
        if (!res.ok) continue
        const buf = Buffer.from(await res.arrayBuffer())
        const size = pngSize(buf)
        pngs.push({ url, buf, ...(size || {}) })
    }
    // 按像素尺寸匹配回图层（sliceScale 在旧版为 4，新版以实际像素为准）
    const used = new Set()
    for (const p of pngs) {
        const scale = p.w && exported.find((e) => e.w) ? p.w / exported.find((e) => e.w).w : 0
        let best = null
        let bestScore = Infinity
        for (const e of exported) {
            if (used.has(e.path)) continue
            const sr = e.w ? p.w / e.w : 0
            const shr = e.h ? p.h / e.h : 0
            if (sr <= 0 || Math.abs(sr - shr) > 0.02) continue
            const score = Math.abs(sr - Math.max(1, Math.round(sr)))
            if (score < bestScore) {
                bestScore = score
                best = e
            }
        }
        if (best) used.add(best.path)
        const hash8 = (p.url.match(/([0-9a-f]{8})[0-9a-f]*\.png$/i) || [, 'x'])[1]
        const name = `${artboard.replace(/\s+/g, '_')}__${hash8}_${p.w}x${p.h}.png`
        writeFileSync(join(outDir, name), p.buf)
        index.push({
            artboard,
            layer: best ? best.path : '(unmatched)',
            frame: best ? `${best.w}x${best.h}` : '',
            file: name,
            px: `${p.w}x${p.h}`,
            bytes: p.buf.length,
            sha256: createHash('sha256').update(p.buf).digest('hex'),
            url: p.url,
        })
    }
}

writeFileSync(join(outDir, 'index.json'), JSON.stringify({ generatedFrom: 'raw-v2', count: index.length, files: index }, null, 1))
console.log('downloaded png slices:', index.length)
const bySize = {}
for (const f of index) {
    const k = f.px
    bySize[k] = bySize[k] || []
    bySize[k].push(f)
}
console.log('\nsmall slices (likely icons):')
for (const [px, list] of Object.entries(bySize).sort()) {
    const [w, h] = px.split('x').map(Number)
    if (w <= 64 && h <= 64) {
        for (const f of list) console.log(`  ${px} | ${f.artboard} | ${f.layer}`)
    }
}
console.log('\nall sizes:', Object.keys(bySize).sort((a, b) => parseInt(a) - parseInt(b)).join(' '))