Decoded

The next most common type of image is based upon a decoded fz_pixmap. These are generally only used if the pixmap takes less storage than the compressed data would.

$\begin{lstlisting} /* fz_pixmap_image_tile: Retried the underlying fz_pixmap f... ... *fz_pixmap_image_tile(fz_context *ctx, fz_pixmap_image *cimg); \end{lstlisting}$

The easiest way to tell if an image is a decoded image is to request its underlying tile. If it returns NULL, you know it is not this sort of image.