resize-bullets.mjs

import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

console.log('============================================');
console.log('弹幕纹理优化脚本');
console.log('============================================\n');
console.log('当前问题：弹幕纹理是2816x1536，解码后占用17MB/张');
console.log('优化目标：缩小到512x512，减少内存占用到1MB/张\n');
console.log('这将节省约 130MB 内存！\n');

// 检查是否安装sharp
let sharp;
try {
  sharp = (await import('sharp')).default;
  console.log('✓ sharp已安装\n');
} catch (e) {
  console.error('错误：sharp未安装！');
  console.error('请运行：npm install sharp\n');
  process.exit(1);
}

const mapDir = path.join(__dirname, 'public', 'map');
const backupDir = path.join(mapDir, 'backup_original');

// 创建备份目录
if (!fs.existsSync(backupDir)) {
  fs.mkdirSync(backupDir, { recursive: true });
}

// 弹幕纹理列表
const bullets = [
  'amulet.png',
  'star.png',
  'yinyang.png',
  'knife.png',
  'laser_head.png',
  'arrow_bullet.png',
  'big_bullet.png',
  'rice_bullet.png'
];

console.log('开始处理...\n');

for (const filename of bullets) {
  const filePath = path.join(mapDir, filename);
  const backupPath = path.join(backupDir, filename);

  if (!fs.existsSync(filePath)) {
    console.log(`[跳过] ${filename} - 文件不存在`);
    continue;
  }

  console.log(`[处理] ${filename}`);

  try {
    // 获取原始信息
    const metadata = await sharp(filePath).metadata();
    console.log(`  原始尺寸：${metadata.width}x${metadata.height}`);

    // 备份原文件
    fs.copyFileSync(filePath, backupPath);

    // 缩小到512x512
    await sharp(filePath)
      .resize(512, 512, {
        fit: 'contain',
        background: { r: 0, g: 0, b: 0, alpha: 0 } // 透明背景
      })
      .png({ quality: 95, compressionLevel: 9 })
      .toFile(filePath + '.tmp');

    // 替换原文件
    fs.renameSync(filePath + '.tmp', filePath);

    const newMetadata = await sharp(filePath).metadata();
    console.log(`  新尺寸：${newMetadata.width}x${newMetadata.height}`);
    console.log(`  ✓ 完成\n`);
  } catch (err) {
    console.error(`  ✗ 失败：${err.message}\n`);
  }
}

console.log('============================================');
console.log('优化完成！');
console.log('============================================\n');
console.log(`原始文件已备份到：${backupDir}\n`);
console.log('预计节省内存：约 130MB\n');