QPDFPageDocumentHelper.cc
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#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFAcroFormDocumentHelper.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
QPDFPageDocumentHelper::QPDFPageDocumentHelper(QPDF& qpdf) :
QPDFDocumentHelper(qpdf)
{
}
std::vector<QPDFPageObjectHelper>
QPDFPageDocumentHelper::getAllPages()
{
std::vector<QPDFPageObjectHelper> pages;
for (auto const& iter: this->qpdf.getAllPages()) {
pages.push_back(QPDFPageObjectHelper(iter));
}
return pages;
}
void
QPDFPageDocumentHelper::pushInheritedAttributesToPage()
{
this->qpdf.pushInheritedAttributesToPage();
}
void
QPDFPageDocumentHelper::removeUnreferencedResources()
{
for (auto& ph: getAllPages()) {
ph.removeUnreferencedResources();
}
}
void
QPDFPageDocumentHelper::addPage(QPDFPageObjectHelper newpage, bool first)
{
this->qpdf.addPage(newpage.getObjectHandle(), first);
}
void
QPDFPageDocumentHelper::addPageAt(
QPDFPageObjectHelper newpage, bool before, QPDFPageObjectHelper refpage)
{
this->qpdf.addPageAt(newpage.getObjectHandle(), before, refpage.getObjectHandle());
}
void
QPDFPageDocumentHelper::removePage(QPDFPageObjectHelper page)
{
this->qpdf.removePage(page.getObjectHandle());
}
void
QPDFPageDocumentHelper::flattenAnnotations(int required_flags, int forbidden_flags)
{
QPDFAcroFormDocumentHelper afdh(this->qpdf);
if (afdh.getNeedAppearances()) {
this->qpdf.getRoot()
.getKey("/AcroForm")
.warnIfPossible("document does not have updated appearance streams, so form fields "
"will not be flattened");
}
for (auto& ph: getAllPages()) {
QPDFObjectHandle resources = ph.getAttribute("/Resources", true);
if (!resources.isDictionary()) {
QTC::TC("qpdf", "QPDFPageDocumentHelper flatten resources missing or invalid");
resources = ph.getObjectHandle().replaceKeyAndGetNew(
"/Resources", QPDFObjectHandle::newDictionary());
}
flattenAnnotationsForPage(ph, resources, afdh, required_flags, forbidden_flags);
}
if (!afdh.getNeedAppearances()) {
this->qpdf.getRoot().removeKey("/AcroForm");
}
}
void
QPDFPageDocumentHelper::flattenAnnotationsForPage(
QPDFPageObjectHelper& page,
QPDFObjectHandle& resources,
QPDFAcroFormDocumentHelper& afdh,
int required_flags,
int forbidden_flags)
{
bool need_appearances = afdh.getNeedAppearances();
std::vector<QPDFAnnotationObjectHelper> annots = page.getAnnotations();
std::vector<QPDFObjectHandle> new_annots;
std::string new_content;
int rotate = 0;
QPDFObjectHandle rotate_obj = page.getObjectHandle().getKey("/Rotate");
if (rotate_obj.isInteger() && rotate_obj.getIntValue()) {
rotate = rotate_obj.getIntValueAsInt();
}
int next_fx = 1;
for (auto& aoh: annots) {
QPDFObjectHandle as = aoh.getAppearanceStream("/N");
bool is_widget = (aoh.getSubtype() == "/Widget");
bool process = true;
if (need_appearances && is_widget) {
QTC::TC("qpdf", "QPDFPageDocumentHelper skip widget need appearances");
process = false;
}
if (process && as.isStream()) {
if (is_widget) {
QTC::TC("qpdf", "QPDFPageDocumentHelper merge DR");
QPDFFormFieldObjectHelper ff = afdh.getFieldForAnnotation(aoh);
QPDFObjectHandle as_resources = as.getDict().getKey("/Resources");
if (as_resources.isIndirect()) {
QTC::TC("qpdf", "QPDFPageDocumentHelper indirect as resources");
as.getDict().replaceKey("/Resources", as_resources.shallowCopy());
as_resources = as.getDict().getKey("/Resources");
}
as_resources.mergeResources(ff.getDefaultResources());
} else {
QTC::TC("qpdf", "QPDFPageDocumentHelper non-widget annotation");
}
std::string name = resources.getUniqueResourceName("/Fxo", next_fx);
std::string content =
aoh.getPageContentForAppearance(name, rotate, required_flags, forbidden_flags);
if (!content.empty()) {
resources.mergeResources("<< /XObject << >> >>"_qpdf);
resources.getKey("/XObject").replaceKey(name, as);
++next_fx;
}
new_content += content;
} else if (process) {
// If an annotation has no appearance stream, just drop the annotation when flattening.
// This can happen for unchecked checkboxes and radio buttons, popup windows associated
// with comments that aren't visible, and other types of annotations that aren't
// visible.
QTC::TC("qpdf", "QPDFPageDocumentHelper ignore annotation with no appearance");
} else {
new_annots.push_back(aoh.getObjectHandle());
}
}
if (new_annots.size() != annots.size()) {
QPDFObjectHandle page_oh = page.getObjectHandle();
if (new_annots.empty()) {
QTC::TC("qpdf", "QPDFPageDocumentHelper remove annots");
page_oh.removeKey("/Annots");
} else {
QPDFObjectHandle old_annots = page_oh.getKey("/Annots");
QPDFObjectHandle new_annots_oh = QPDFObjectHandle::newArray(new_annots);
if (old_annots.isIndirect()) {
QTC::TC("qpdf", "QPDFPageDocumentHelper replace indirect annots");
this->qpdf.replaceObject(old_annots.getObjGen(), new_annots_oh);
} else {
QTC::TC("qpdf", "QPDFPageDocumentHelper replace direct annots");
page_oh.replaceKey("/Annots", new_annots_oh);
}
}
page.addPageContents(qpdf.newStream("q\n"), true);
page.addPageContents(qpdf.newStream("\nQ\n" + new_content), false);
}
}