THPDFJpegReducedDecodeStatus

THPDFJpegReducedDecodeStatus =
  (jrdsCompleted, jrdsCancelled, jrdsFailed);

• jrdsCompleted 表示确切的目标位图已就绪
• jrdsCancelled 表示取消回调在扫描线之间停止了解码
• jrdsFailed 表示验证或原生解码失败，ErrorMessage 包含诊断

参见 THPDFJpegReducedDecoder.Decode