test x.tex

test x

\documentclass{classnofonts}
\usepackage{blindtext}
\usepackage[demo]{graphicx}
\graphicspath{{pictures/}}

\makeatletter
\let\oldcaption\caption
\newcount\realfig
\def\caption{%
\protected@write\@auxout{}{\string\real@fig{\the\value{figure}}}%
\expandafter\csname real@@fig@\the\value{figure}\endcsname
\oldcaption}
\def\real@fig#1{%
\global\advance\realfig\@ne
\expandafter\xdef\csname real@@fig@#1\endcsname{%
\def\noexpand\thefigure{\the\realfig}%
}}
\makeatother

\begin{document}

\begin{figure*}[b]
\includegraphics[width=.99\linewidth]{example-image-a}
\caption{fafqfaf}
\end{figure*}

\blindtext

\begin{marginfigure}%
\includegraphics[width=\linewidth]{example-image-a}
\caption{a4a4a4a4a4}
\end{marginfigure}

\end{document}