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| 1676 | tullio | 1 | %---------------------------------------------------------------------------- |
| 2 | \chapter{The Snapshot Library} |
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| 3 | %---------------------------------------------------------------------------- |
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| 4 | |||
| 5 | The library allow applications to save up to 16 screen snapshot to file. Before |
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| 6 | the grabbing is necessary to allocate the memory for a snapshot slot and files |
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| 7 | can be created only at the end of execution when the system return in real mode. |
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| 8 | |||
| 9 | \vspace{7mm} |
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| 10 | |||
| 11 | \begin{intest} |
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| 12 | SNAPSHOT\_GETSLOT \index{snapshot\_getslot()} |
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| 13 | \end{intest} |
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| 14 | |||
| 15 | \begin{description} |
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| 16 | \item [\textbf{void {*}snapshot\_getslot(int nbuff, int wx, int wy, int byesperpixel); }] |
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| 17 | \item [\textbf{Description:}] This function allocate the memory for a snapshot of given |
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| 18 | dimensions. The \texttt{nbuff} parameter indicate which slot must be allocated. |
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| 19 | \texttt{wx} and \texttt{wy} are width and height of the screen resolution while |
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| 20 | \texttt{bytesperpixel} is the depth of the screen. |
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| 21 | \end{description} |
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| 22 | |||
| 23 | \begin{intest} |
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| 24 | SNAPSHOT\_FREESLOT\index{snapshot\_freeslot()} |
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| 25 | \end{intest} |
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| 26 | |||
| 27 | \begin{description} |
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| 28 | \item [\textbf{void snapshot\_freeslot(int nbuff) }] |
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| 29 | \item [\textbf{Description:}] This function free the memory reserved for the slot |
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| 30 | indicated by the \texttt{nbuff} parameter. |
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| 31 | \end{description} |
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| 32 | |||
| 33 | \begin{intest} |
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| 34 | SNAPSHOT\_GRAB\index{snapshot\_grab()} |
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| 35 | \end{intest} |
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| 36 | |||
| 37 | \begin{description} |
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| 38 | \item [\textbf{void snapshot\_grab(int nbuff) }] |
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| 39 | \item [\textbf{Description:}] This function get a snap of the video memory and copy it |
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| 40 | inside the slot specified by the \texttt{nbuff} parameter. |
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| 41 | \end{description} |
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| 42 | |||
| 43 | \begin{intest} |
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| 44 | SNAPSHOT\_SAVEPGM\index{snapshot\_savepgm()} |
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| 45 | \end{intest} |
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| 46 | |||
| 47 | \begin{description} |
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| 48 | \item [\textbf{int snapshot\_savepgm(int nbuff, char {*}fname) }] |
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| 49 | \item [\textbf{Description:}] This function save the screen snapshot saved inside the |
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| 50 | nbuff slot to a PGM greyscale file. The filename passed to the function using |
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| 51 | the fname parameter. |
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| 52 | \end{description} |
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| 53 | |||
| 54 | \begin{intest} |
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| 55 | SNAPSHOT\_SAVEPPM\index{snapshot\_saveppm()} |
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| 56 | \end{intest} |
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| 57 | |||
| 58 | \begin{description} |
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| 59 | \item [\textbf{int snapshot\_saveppm(int nbuff, char {*}fname) }] |
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| 60 | \item [\textbf{Description:}] This function save the screen snapshot saved inside the |
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| 61 | nbuff slot to a PPM color file. The filename passed to the function using the |
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| 62 | fname parameter. |
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| 63 | \end{description} |
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| 64 |