Class ImageCompressTask

src/fork/module/Image/ImageCompressTask.ts:15–1212

import { dirname, extname, join, basename } from 'node:path'

export class ImageCompressTask implements TaskItem {
  /** 需要处理的图片 */
  image: ImageInfoFetchTask
  /**
   * 本地存储路径
   */
  path: string = ''
  backupPath: string = ''
  /** sharp配置 */
  config: SharpConfig
  /** 处理后的文件大小 */
  size: number = 0
  /** 格式化后的文件大小字符串 */
  sizeFormatted: string = ''
  /** 处理后的图片宽度 */
  width: number = 0
  /** 处理后的图片高度 */
  height: number = 0
  /** 处理后的图片格式 */
  ext = ''
  /** 压缩比 */
  compressionRatio: number = 0
  /**
   * 缩小比例
   */
  sizePercentage: string = ''
  /** 是否应用了水印 */
  hasWatermark: boolean = false
  /** 是否应用了纹理 */
  hasTexture: boolean = false
  /** 文件状态 */
  hasError: boolean = false
  /** 错误信息 */
  errorMessage: string = ''

  constructor(image: ImageInfoFetchTask, config: SharpConfig, path: string, backupPath: string) {
    this.image = image
    this.config = config
    this.path = path
    this.backupPath = backupPath
  }

  /** 格式化文件大小 */
  private formatFileSize(bytes: number): string {
    if (bytes === 0) return '0 B'
    const units = ['B', 'KB', 'MB', 'GB', 'TB']
    const k = 1024
    const i = Math.floor(Math.log(bytes) / Math.log(k))
    return `${parseFloat((bytes / Math.pow(k, i)).toFixed(2))} ${units[i]}`
  }

  /** 获取压缩后的文件大小 */
  private async getFileSize(): Promise<boolean> {
    try {
      const stats = await stat(this.path)
      this.size = stats.size
      this.sizeFormatted = this.formatFileSize(stats.size)
      if (this.image.size > 0) {