XeLaTeX watermarking environment macro

draft_watermark.tex

\usepackage{everypage}

\newenvironment{water}{\AddEverypageHook{\waterb}}{
    \AddThispageHook{\waterb}\AddEverypageHook{\watere}
}

\makeatletter
\newcommand{\waterb}{
\AddToShipoutPicture*{%
            \setlength{\@tempdimb}{.5\paperwidth}%
            \setlength{\@tempdimc}{.5\paperheight}%
            \setlength{\unitlength}{1pt}%
            \put(\strip@pt\@tempdimb,\strip@pt\@tempdimc){%
        \makebox(0,0){\rotatebox{45}{\textcolor[gray]{0.75}%
        {\fontsize{6cm}{6cm}\selectfont{DRAFT}}}}%
            }%
}}
\makeatother

\makeatletter
\newcommand{\watere}{
\AddToShipoutPicture*{%
            \setlength{\@tempdimb}{.5\paperwidth}%
            \setlength{\@tempdimc}{.5\paperheight}%
            \setlength{\unitlength}{1pt}%
            \put(\strip@pt\@tempdimb,\strip@pt\@tempdimc){%
        \makebox(0,0){\rotatebox{45}{\textcolor[gray]{1}%
        {\fontsize{6cm}{6cm}\selectfont{DRAFT}}}}%
            }%
}}
\makeatother

watermark.tex

\usepackage{everypage}

\newenvironment{water}{\AddEverypageHook{\waterb}}{
    \AddThispageHook{\waterb}\AddEverypageHook{\watere}
}

\makeatletter
\newcommand{\waterb}{
\AddToShipoutPicture*{%
            \setlength{\@tempdimb}{.3\paperwidth}%
            \setlength{\@tempdimc}{.4\paperheight}%
            \setlength{\unitlength}{1pt}%
            \put(\strip@pt\@tempdimb,\strip@pt\@tempdimc){%
        \includegraphics[height=100mm]{watermark.png}
            }%
}}
\makeatother

\makeatletter
\newcommand{\watere}{
\AddToShipoutPicture*{%
            \setlength{\@tempdimb}{.3\paperwidth}%
            \setlength{\@tempdimc}{.4\paperheight}%
            \setlength{\unitlength}{1pt}%
            \put(\strip@pt\@tempdimb,\strip@pt\@tempdimc){%
        \includegraphics[height=100mm]{watermark.png}
            }%
}}
\makeatother

watermark_usage.tex

\begin{water}
    % watermarked pages here
\end{water}