void PDFDocumentImage::setCurrentPage(int page)
{
if (!m_document)
return;
if (page == m_currentPage)
return;
if (!(page >= 0 && page < pageCount()))
return;
m_currentPage = page;
CGPDFPageRef cgPage = CGPDFDocumentGetPage(m_document, page + 1);
// get media box (guaranteed)
m_mediaBox = CGPDFPageGetBoxRect(cgPage, kCGPDFMediaBox);
// get crop box (not always there). if not, use media box
CGRect r = CGPDFPageGetBoxRect(cgPage, kCGPDFCropBox);
if (!CGRectIsEmpty(r))
m_cropBox = r;
else
m_cropBox = m_mediaBox;
// get page rotation angle
m_rotation = CGPDFPageGetRotationAngle(cgPage) * piFloat / 180.0f; // to radians
}
int PDFPageGetRotation(CGPDFPageRef page)
{
/* From the PDF Reference:
* /Rotate: The number of degrees by which the page should be rotated clockwise when
* displayed or printed. The value must be a multiple of 90.
*/
int rotationAngle = CGPDFPageGetRotationAngle(page);
if (rotationAngle % 90 != 0)
return 0;
else
return (4 + ((rotationAngle / 90) % 4)) % 4;
}
void PDFDocumentImage::computeBoundsForCurrentPage()
{
CGPDFPageRef cgPage = CGPDFDocumentGetPage(m_document.get(), 1);
CGRect mediaBox = CGPDFPageGetBoxRect(cgPage, kCGPDFMediaBox);
// Get crop box (not always there). If not, use media box.
CGRect r = CGPDFPageGetBoxRect(cgPage, kCGPDFCropBox);
if (!CGRectIsEmpty(r))
m_cropBox = r;
else
m_cropBox = mediaBox;
m_rotationDegrees = CGPDFPageGetRotationAngle(cgPage);
}
