Querying

We define a structure type to hold the details of arbitrary transitions, together with some opaque state:

$\begin{lstlisting} enum { FZ_TRANSITION_NONE = 0, /* aka 'R' or 'REPLACE' */ F... ...e transition code */ int state0; int state1; } fz_transition; \end{lstlisting}$

Armed with such a structure, we can call a function to get it filled out:

$\begin{lstlisting} /* fz_page_presentation: Get the presentation details for a ... ...tx, fz_page *page, fz_transition *transition, float *duration); \end{lstlisting}$

This structure is defined to be sufficient to encapsulate the currently defined PDF transition types; it may be extended in future if other formats require more expressiveness.

Callers are free to directly implement their transitions using the information herein, or else they can make use of a helper function.