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2829
除了手动改变scale的值，还有别的方式能让不同长度水印自己去适应页面大小吗？
```tex
\documentclass{article}
%-------------------- Add package in here---------------------
\usepackage{transparent}
\usepackage[left=2cm, right=2cm, top=3cm, bottom=3cm]{geometry}
\usepackage{fancyhdr}%頁首 ；頁尾
\pagestyle{fancy}%頁首 ；頁尾
\usepackage[printwatermark]{xwatermark}
\usepackage{titlesec}
\usepackage{titletoc}
\usepackage{tabu}
\usepackage{tikz}
%------------------- set global format --------------------------
\newwatermark*[allpages,color=gray!100,angle=45,scale=2,xpos=0,ypos=0]{\transparent{0.2}{Released to Xiongmai Silicon under NDA}} %-- Add watermark
%-------------------- Header and footer settings --------------------------------
\lhead{APM} %頁首左邊
\rhead{ APS3208K-OKx DDR OPI PSRAM}
\lfoot{\footnotesize {APM OPI PSRAM Datasheet.pdf \\ Rev. 2.4 Feb.14,2020 }}
\rfoot{\footnotesize{AP Memory reserves the right to change products \\ and/or specifications without notice \\@2020 AP Memory. All rights reserved}}%頁尾右邊
\renewcommand{\footrulewidth}{0.4pt} % 設定頁尾多一條粗細是 0.4 pt 的水平線
\begin{document}
\vspace*{0.5cm}
\begin{center}
\huge \textbf{Double-Data-Rate OPI PSRAM}
\vspace{1cm}
\end{center}
\noindent\rule{\textwidth}{2pt}
\end{document}
```
