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Setting and checking mask states
The state of the mask at a given point is set using the function:
![$\textstyle \parbox{\linewidth}{
\vspace{\baselineskip}\noindent\texttt{
void Sp...
...
\item[\emph{state\_name}] The particular state to be set.
\end{description}}}$](img582.png)
The state of the mask at a given point can be checked using:
![$\textstyle \parbox{\linewidth}{
\vspace{\baselineskip}\noindent\texttt{
int Spa...
...em[\emph{state\_name}] The particular state to be compared.
\end{description}}}$](img583.png)
The return value is 1 if the given state_name has been set at the point, or 0 otherwise.