pdfSetDiscardDiagonalText
Discard diagonal text when doing text extraction.
void pdfSetDiscardDiagonalText(PDFViewerHandle viewer, BOOL discard)
During text extraction, all text on a page is assigned to one of four
rotations (0, 90, 180, or 270 degrees). Normally, text is assigned to
the closest rotation value.
If this function is called with discard
true, any text
that's not close to one of the 0, 90, 180, or 270 degree axes, is
discarded. This is useful to skip watermarks drawn on top of body
text, etc.
C:
pdfSetDiscardDiagonalText(viewer, TRUE);