backend/src/services/screenshotService.js

import puppeteer from 'puppeteer';

class ScreenshotService {
  async generateScreenshot(htmlContent, options = {}) {
    const browser = await puppeteer.launch({
      headless: true,
      args: [
        '--no-sandbox',
        '--disable-setuid-sandbox',
        '--disable-dev-shm-usage',
        '--disable-accelerated-2d-canvas',
        '--no-first-run',
        '--no-zygote',
        '--single-process', // <- this one doesn't work in Windows
        '--disable-gpu'
      ]
    });
    
    try {
      const page = await browser.newPage();
      
      // 设置页面视窗大小，匹配PPT的4:3比例
      await page.setViewport({ 
        width: 1000, 
        height: 750,
        deviceScaleFactor: 2 // 高分辨率
      });
      
      // 设置HTML内容
      await page.setContent(htmlContent, { waitUntil: 'networkidle0' });
      
      // 等待页面完全加载
      await page.waitForTimeout(1000);
      
      // 截图
      const screenshot = await page.screenshot({
        type: 'jpeg',
        quality: 85,
        fullPage: false
      });
      
      return screenshot;
    } finally {
      await browser.close();
    }
  }
}

export default new ScreenshotService();