Add a watermark overlayed to floats (figures, tables ... but mostly tables)

Question

I would like to put a watermark, e.g. "DRAFT", but only overlayed and on specific figures and tables.
Looking around, I tried to use the background package. At the beginning of my document:
usepackage[some]{background}
SetBgScale{1}
SetBgContents{parbox{10cm}{%
  Huge Draft:  today[14cm]rotatebox{180}{Huge Draft:  today}}}
SetBgColor{gray}
SetBgAngle{270}
SetBgOpacity{0.2}

Then inside the table environment:
begin{table}
BgThispage
small
begin{center}
begin{tabular}
[...]

The result is however that the watermark appears one page before the table, not on the same page. I tried adding the [H] option to the table, hoping to force LaTeX but to no avail.
Then I tried using the xwatermark package. While not optimal, it gives me an option to apply a watermark on specific pages:
usepackage[printwatermark]{xwatermark}
newwatermark[pagex={178,179},fontfamily=bch,color=gray!25,angle=45,scale=3,12xpos=0,ypos=0]{DRAFT}

However when I compile with PDFLatex, XeLatex or LuaLatex:
 ! Package ltxkeys Error: The above keys are undefined and couldn't be set.

A workaround I have for figures is to open them in Inkscape and directly write my watermark on top of it. But I don't have this option for the table.
Do you have a solution? Thanks!

Cicada · Accepted Answer

(Too big for a comment)
tikzmark{}s inside the floats shows promise:

Someone more knowledgeable in TikZ might be able to help.
MWE
documentclass{article}
usepackage{graphicx}
usepackage{tikz}
usetikzlibrary{tikzmark}
begin{document}
x
newpage
xx

begin{figure}
tikzmark{tmTL}
begin{center}
includegraphics{example-image-duck}
tikzmark{tmBR}
end{center}
caption{Caption}
label{fig:eg}
end{figure}

Some text

begin{table}
begin{center}
begin{tabular}{ccc}
hline 
tikzmark{ttmTL} xxx & xxx & xxx 
xxx & xxx & xxx 
xxx & xxx & xxxtikzmark{ttmBR}  
hline 
end{tabular}
caption{Caption}
label{tab:eg}
end{center}
end{table}

tikz[overlay,remember picture]draw[->,red,thick] (pic cs:tmTL) to [edge label={huge DRAFT}] (pic cs:tmBR) ;

tikz[overlay,remember picture]draw[->,red,thick,] (pic cs:ttmTL) to [edge label={huge DRAFT}]  (pic cs:ttmBR) ;
end{document}

John Kormylo · Answer

This uses lrbox and varwidth to measure the size of the contents, llap to overlay it, and resizebox to scale the overlaid image.
documentclass{article}
usepackage{xcolor}
usepackage{graphicx}
usepackage{adjustbox}% for resizebox
usepackage{varwidth}

newsavebox{draftbox}
savebox{draftbox}{color{red}huge Draft}% create image for overlay

newenvironment{draft}{begin{lrbox}{0}varwidth[b]{linewidth}}%
  {endvarwidthend{lrbox}usebox0
  llap{resizebox{wd0}{ht0}{useboxdraftbox}}}

begin{document}

begin{figure}
centering
begin{draft}
includegraphics{example-image-duck}
caption{Caption}
label{fig:eg}
end{draft}
end{figure}

Some text

begin{table}
centering
begin{draft}
begin{tabular}{ccc}
hline 
xxx & xxx & xxx 
xxx & xxx & xxx 
xxx & xxx & xxx 
hline 
end{tabular}
caption{Caption}
label{tab:eg}
end{draft}
end{table}
end{document}

This version uses the entire width and puts the overlay into the background.  Note that centering is now inside draft.
documentclass{article}
usepackage{xcolor}
usepackage{graphicx}
usepackage{adjustbox}% for resizebox

newsavebox{draftbox}
savebox{draftbox}{color{red}huge Draft}% create image for overlay

newenvironment{draft}{begin{lrbox}{0}minipage[b]{linewidth}}%
  {endminipageend{lrbox}%
  leavevmoderlap{resizebox{wd0}{ht0}{useboxdraftbox}}usebox0}

begin{document}

begin{figure}
begin{draft}
centering
includegraphics{example-image-duck}
caption{Caption}
label{fig:eg}
end{draft}
end{figure}

Some text

begin{table}
begin{draft}
centering
begin{tabular}{ccc}
hline 
xxx & xxx & xxx 
xxx & xxx & xxx 
xxx & xxx & xxx 
hline 
end{tabular}
caption{Caption}
label{tab:eg}
end{draft}
end{table}
end{document}

Add a watermark overlayed to floats (figures, tables ... but mostly tables)

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