teachcloud-mark-tool/electron/preload/api.ts

import gm from 'gm';
import path from 'node:path';

import { getImagicPath, getTempPath } from './utils';

// macos install gm imagemagick https://github.com/aheckmann/gm/blob/master/README.md
const gmInst =
  process.platform === 'win32'
    ? gm.subClass({
        imageMagick: '7+',
        appPath: getImagicPath(),
      })
    : gm.subClass({ imageMagick: '7+' });

function cropImage(imgPath: string): Promise<string> {
  return new Promise((resolve, reject) => {
    const outpath = path.join(getTempPath(), '001.png');
    gmInst(imgPath)
      .crop(500, 200, 0, 0)
      .write(outpath, (err) => {
        if (!err) {
          return resolve(outpath);
        }
        return reject(err);
      });
  });
}

const commonApi = {
  cropImage,
};

export type CommonApi = typeof commonApi;

export default commonApi;