pdfSetRedrawCbk
Set a callback function for window redraws.
void pdfSetRedrawCbk(PDFViewerHandle viewer,
void (*cbk)(void *data, HDC dc,
int left, int top, int right, int bottom),
void *data)
This function sets a callback function that will be called whenever
the XpdfViewer window (or a portion of the window) needs to be
redrawn.
This can be used to draw arbitrary content on top of the PDF file.
C:
void redrawCbk(void *data, HDC dc, int left, int top,
int right, int bottom) {
/* use Windows GDI functions to draw in [dc] ... */
}
...
pdfSetRedrawCbk(viewer, &redrawCbk, NULL);