File indexing completed on 2024-04-28 04:32:44

 /*
     SPDX-FileCopyrightText: 2004 Enrico Ros <eros.kde@email.it>
 
     Work sponsored by the LiMux project of the city of Munich:
     SPDX-FileCopyrightText: 2017 Klarälvdalens Datakonsult AB a KDAB Group company <info@kdab.com>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "page.h"
 #include "page_p.h"
 
 // qt/kde includes
 #include <QDomDocument>
 #include <QDomElement>
 #include <QHash>
 #include <QPixmap>
 #include <QSet>
 #include <QString>
 #include <QUuid>
 #include <QVariant>
 
 #include <QDebug>
 
 // local includes
 #include "action.h"
 #include "annotations.h"
 #include "annotations_p.h"
 #include "debug_p.h"
 #include "document.h"
 #include "document_p.h"
 #include "form.h"
 #include "form_p.h"
 #include "observer.h"
 #include "pagecontroller_p.h"
 #include "pagesize.h"
 #include "pagetransition.h"
 #include "rotationjob_p.h"
 #include "textpage_p.h"
 #include "tile.h"
 #include "tilesmanager_p.h"
 #include "utils_p.h"
 
 #include <limits>
 
 #ifdef PAGE_PROFILE
 #include <QTime>
 #endif
 
 using namespace Okular;
 
 static const double distanceConsideredEqual = 25; // 5px
 
 static void deleteObjectRects(QList<ObjectRect *> &rects, const QSet<ObjectRect::ObjectType> &which)
 {
     QList<ObjectRect *>::iterator it = rects.begin();
     for (; it != rects.end();) {
         if (which.contains((*it)->objectType())) {
             delete *it;
             it = rects.erase(it);
         } else {
             ++it;
         }
     }
 }
 
 PagePrivate::PagePrivate(Page *page, uint n, double w, double h, Rotation o)
     : m_page(page)
     , m_number(n)
     , m_orientation(o)
     , m_width(w)
     , m_height(h)
     , m_doc(nullptr)
     , m_boundingBox(0, 0, 1, 1)
     , m_rotation(Rotation0)
     , m_text(nullptr)
     , m_transition(nullptr)
     , m_textSelections(nullptr)
     , m_openingAction(nullptr)
     , m_closingAction(nullptr)
     , m_duration(-1)
     , m_isBoundingBoxKnown(false)
 {
     // avoid Division-By-Zero problems in the program
     if (m_width <= 0) {
         m_width = 1;
     }
 
     if (m_height <= 0) {
         m_height = 1;
     }
 }
 
 PagePrivate::~PagePrivate()
 {
     qDeleteAll(formfields);
     delete m_openingAction;
     delete m_closingAction;
     delete m_text;
     delete m_transition;
 }
 
 PagePrivate *PagePrivate::get(Page *page)
 {
     return page ? page->d : nullptr;
 }
 
 void PagePrivate::imageRotationDone(RotationJob *job)
 {
     TilesManager *tm = tilesManager(job->observer());
     if (tm) {
         QPixmap *pixmap = new QPixmap(QPixmap::fromImage(job->image()));
         tm->setPixmap(pixmap, job->rect(), job->isPartialUpdate());
         delete pixmap;
         return;
     }
 
     QMap<DocumentObserver *, PixmapObject>::iterator it = m_pixmaps.find(job->observer());
     if (it != m_pixmaps.end()) {
         PixmapObject &object = it.value();
         (*object.m_pixmap) = QPixmap::fromImage(job->image());
         object.m_rotation = job->rotation();
         object.m_isPartialPixmap = job->isPartialUpdate();
     } else {
         PixmapObject object;
         object.m_pixmap = new QPixmap(QPixmap::fromImage(job->image()));
         object.m_rotation = job->rotation();
         object.m_isPartialPixmap = job->isPartialUpdate();
 
         m_pixmaps.insert(job->observer(), object);
     }
 }
 
 QTransform PagePrivate::rotationMatrix() const
 {
     return Okular::buildRotationMatrix(m_rotation);
 }
 
 /** class Page **/
 
 Page::Page(uint pageNumber, double w, double h, Rotation o)
     : d(new PagePrivate(this, pageNumber, w, h, o))
 {
 }
 
 Page::~Page()
 {
     if (d) {
         deletePixmaps();
         deleteRects();
         d->deleteHighlights();
         deleteAnnotations();
         d->deleteTextSelections();
         deleteSourceReferences();
 
         delete d;
     }
 }
 
 int Page::number() const
 {
     return d->m_number;
 }
 
 Rotation Page::orientation() const
 {
     return d->m_orientation;
 }
 
 Rotation Page::rotation() const
 {
     return d->m_rotation;
 }
 
 Rotation Page::totalOrientation() const
 {
     return (Rotation)(((int)d->m_orientation + (int)d->m_rotation) % 4);
 }
 
 double Page::width() const
 {
     return d->m_width;
 }
 
 double Page::height() const
 {
     return d->m_height;
 }
 
 double Page::ratio() const
 {
     return d->m_height / d->m_width;
 }
 
 NormalizedRect Page::boundingBox() const
 {
     return d->m_boundingBox;
 }
 
 bool Page::isBoundingBoxKnown() const
 {
     return d->m_isBoundingBoxKnown;
 }
 
 void Page::setBoundingBox(const NormalizedRect &bbox)
 {
     if (d->m_isBoundingBoxKnown && d->m_boundingBox == bbox) {
         return;
     }
 
     // Allow tiny rounding errors (happens during rotation)
     static const double epsilon = 0.00001;
     Q_ASSERT(bbox.left >= -epsilon && bbox.top >= -epsilon && bbox.right <= 1 + epsilon && bbox.bottom <= 1 + epsilon);
 
     d->m_boundingBox = bbox & NormalizedRect(0., 0., 1., 1.);
     d->m_isBoundingBoxKnown = true;
 }
 
 bool Page::hasPixmap(DocumentObserver *observer, int width, int height, const NormalizedRect &rect) const
 {
     TilesManager *tm = d->tilesManager(observer);
     if (tm) {
         if (width != tm->width() || height != tm->height()) {
             return false;
         }
 
         return tm->hasPixmap(rect);
     }
 
     QMap<DocumentObserver *, PagePrivate::PixmapObject>::const_iterator it = d->m_pixmaps.constFind(observer);
     if (it == d->m_pixmaps.constEnd()) {
         return false;
     }
 
     if (width == -1 || height == -1) {
         return true;
     }
 
     if (it.value().m_isPartialPixmap) {
         return false;
     }
 
     const QPixmap *pixmap = it.value().m_pixmap;
 
     return (pixmap->width() == width && pixmap->height() == height);
 }
 
 void Page::setPageSize(DocumentObserver *observer, int width, int height)
 {
     TilesManager *tm = d->tilesManager(observer);
     if (tm) {
         tm->setSize(width, height);
     }
 }
 
 bool Page::hasTextPage() const
 {
     return d->m_text != nullptr;
 }
 
 RegularAreaRect *Page::wordAt(const NormalizedPoint &p, QString *word) const
 {
     if (d->m_text) {
         return d->m_text->wordAt(p, word);
     }
 
     return nullptr;
 }
 
 RegularAreaRect *Page::textArea(TextSelection *selection) const
 {
     if (d->m_text) {
         return d->m_text->textArea(selection);
     }
 
     return nullptr;
 }
 
 bool Page::hasObjectRect(double x, double y, double xScale, double yScale) const
 {
     if (m_rects.isEmpty()) {
         return false;
     }
 
     for (ObjectRect *rect : m_rects) {
         if (rect->distanceSqr(x, y, xScale, yScale) < distanceConsideredEqual) {
             return true;
         }
     }
 
     return false;
 }
 
 bool Page::hasHighlights(int s_id) const
 {
     // simple case: have no highlights
     if (m_highlights.isEmpty()) {
         return false;
     }
     // simple case: we have highlights and no id to match
     if (s_id == -1) {
         return true;
     }
     // iterate on the highlights list to find an entry by id
     for (HighlightAreaRect *highlight : m_highlights) {
         if (highlight->s_id == s_id) {
             return true;
         }
     }
     return false;
 }
 
 bool Page::hasTransition() const
 {
     return d->m_transition != nullptr;
 }
 
 bool Page::hasAnnotations() const
 {
     return !m_annotations.isEmpty();
 }
 
 RegularAreaRect *Page::findText(int id, const QString &text, SearchDirection direction, Qt::CaseSensitivity caseSensitivity, const RegularAreaRect *lastRect) const
 {
     RegularAreaRect *rect = nullptr;
     if (text.isEmpty() || !d->m_text) {
         return rect;
     }
 
     rect = d->m_text->findText(id, text, direction, caseSensitivity, lastRect);
     return rect;
 }
 
 QString Page::text(const RegularAreaRect *area) const
 {
     return text(area, TextPage::AnyPixelTextAreaInclusionBehaviour);
 }
 
 QString Page::text(const RegularAreaRect *area, TextPage::TextAreaInclusionBehaviour b) const
 {
     QString ret;
 
     if (!d->m_text) {
         return ret;
     }
 
     if (area) {
         RegularAreaRect rotatedArea = *area;
         rotatedArea.transform(d->rotationMatrix().inverted());
 
         ret = d->m_text->text(&rotatedArea, b);
     } else {
         ret = d->m_text->text(nullptr, b);
     }
 
     return ret;
 }
 
 TextEntity::List Page::words(const RegularAreaRect *area, TextPage::TextAreaInclusionBehaviour b) const
 {
     TextEntity::List ret;
 
     if (!d->m_text) {
         return ret;
     }
 
     if (area) {
         RegularAreaRect rotatedArea = *area;
         rotatedArea.transform(d->rotationMatrix().inverted());
 
         ret = d->m_text->words(&rotatedArea, b);
     } else {
         ret = d->m_text->words(nullptr, b);
     }
 
     for (auto &retI : ret) {
         retI = TextEntity(retI.text(), Okular::NormalizedRect(retI.transformedArea(d->rotationMatrix())));
     }
 
     return ret;
 }
 
 void PagePrivate::rotateAt(Rotation orientation)
 {
     if (orientation == m_rotation) {
         return;
     }
 
     deleteTextSelections();
 
     if (((int)m_orientation + (int)m_rotation) % 2 != ((int)m_orientation + (int)orientation) % 2) {
         std::swap(m_width, m_height);
     }
 
     Rotation oldRotation = m_rotation;
     m_rotation = orientation;
 
     /**
      * Rotate the images of the page.
      */
     QMapIterator<DocumentObserver *, PagePrivate::PixmapObject> it(m_pixmaps);
     while (it.hasNext()) {
         it.next();
 
         const PagePrivate::PixmapObject &object = it.value();
 
         RotationJob *job = new RotationJob(object.m_pixmap->toImage(), object.m_rotation, m_rotation, it.key());
         job->setPage(this);
         m_doc->m_pageController->addRotationJob(job);
     }
 
     /**
      * Rotate tiles manager
      */
     QMapIterator<const DocumentObserver *, TilesManager *> i(m_tilesManagers);
     while (i.hasNext()) {
         i.next();
 
         TilesManager *tm = i.value();
         if (tm) {
             tm->setRotation(m_rotation);
         }
     }
 
     /**
      * Rotate the object rects on the page.
      */
     const QTransform matrix = rotationMatrix();
     for (ObjectRect *objRect : std::as_const(m_page->m_rects)) {
         objRect->transform(matrix);
     }
 
     const QTransform highlightRotationMatrix = Okular::buildRotationMatrix((Rotation)(((int)m_rotation - (int)oldRotation + 4) % 4));
     for (HighlightAreaRect *hlar : std::as_const(m_page->m_highlights)) {
         hlar->transform(highlightRotationMatrix);
     }
 }
 
 void PagePrivate::changeSize(const PageSize &size)
 {
     if (size.isNull() || (size.width() == m_width && size.height() == m_height)) {
         return;
     }
 
     m_page->deletePixmaps();
     //    deleteHighlights();
     //    deleteTextSelections();
 
     m_width = size.width();
     m_height = size.height();
     if (m_rotation % 2) {
         std::swap(m_width, m_height);
     }
 }
 
 const ObjectRect *Page::objectRect(ObjectRect::ObjectType type, double x, double y, double xScale, double yScale) const
 {
     // Walk list in reverse order so that annotations in the foreground are preferred
     QListIterator<ObjectRect *> it(m_rects);
     it.toBack();
     while (it.hasPrevious()) {
         const ObjectRect *objrect = it.previous();
         if ((objrect->objectType() == type) && objrect->distanceSqr(x, y, xScale, yScale) < distanceConsideredEqual) {
             return objrect;
         }
     }
 
     return nullptr;
 }
 
 QList<const ObjectRect *> Page::objectRects(ObjectRect::ObjectType type, double x, double y, double xScale, double yScale) const
 {
     QList<const ObjectRect *> result;
 
     QListIterator<ObjectRect *> it(m_rects);
     it.toBack();
     while (it.hasPrevious()) {
         const ObjectRect *objrect = it.previous();
         if ((objrect->objectType() == type) && objrect->distanceSqr(x, y, xScale, yScale) < distanceConsideredEqual) {
             result.append(objrect);
         }
     }
 
     return result;
 }
 
 const ObjectRect *Page::nearestObjectRect(ObjectRect::ObjectType type, double x, double y, double xScale, double yScale, double *distance) const
 {
     ObjectRect *res = nullptr;
     double minDistance = std::numeric_limits<double>::max();
 
     for (ObjectRect *rect : m_rects) {
         if (rect->objectType() == type) {
             double d = rect->distanceSqr(x, y, xScale, yScale);
             if (d < minDistance) {
                 res = rect;
                 minDistance = d;
             }
         }
     }
 
     if (distance) {
         *distance = minDistance;
     }
     return res;
 }
 
 const PageTransition *Page::transition() const
 {
     return d->m_transition;
 }
 
 QList<Annotation *> Page::annotations() const
 {
     return m_annotations;
 }
 
 Annotation *Page::annotation(const QString &uniqueName) const
 {
     for (Annotation *a : m_annotations) {
         if (a->uniqueName() == uniqueName) {
             return a;
         }
     }
     return nullptr;
 }
 
 const Action *Page::pageAction(PageAction action) const
 {
     switch (action) {
     case Page::Opening:
         return d->m_openingAction;
         break;
     case Page::Closing:
         return d->m_closingAction;
         break;
     }
 
     return nullptr;
 }
 
 QList<FormField *> Page::formFields() const
 {
     return d->formfields;
 }
 
 void Page::setPixmap(DocumentObserver *observer, QPixmap *pixmap, const NormalizedRect &rect)
 {
     d->setPixmap(observer, pixmap, rect, false /*isPartialPixmap*/);
 }
 
 void PagePrivate::setPixmap(DocumentObserver *observer, QPixmap *pixmap, const NormalizedRect &rect, bool isPartialPixmap)
 {
     if (m_rotation == Rotation0) {
         TilesManager *tm = tilesManager(observer);
         if (tm) {
             tm->setPixmap(pixmap, rect, isPartialPixmap);
             delete pixmap;
             return;
         }
 
         QMap<DocumentObserver *, PagePrivate::PixmapObject>::iterator it = m_pixmaps.find(observer);
         if (it != m_pixmaps.end()) {
             delete it.value().m_pixmap;
         } else {
             it = m_pixmaps.insert(observer, PagePrivate::PixmapObject());
         }
         it.value().m_pixmap = pixmap;
         it.value().m_rotation = m_rotation;
         it.value().m_isPartialPixmap = isPartialPixmap;
     } else {
         // it can happen that we get a setPixmap while closing and thus the page controller is gone
         if (m_doc->m_pageController) {
             RotationJob *job = new RotationJob(pixmap->toImage(), Rotation0, m_rotation, observer);
             job->setPage(this);
             job->setRect(TilesManager::toRotatedRect(rect, m_rotation));
             job->setIsPartialUpdate(isPartialPixmap);
             m_doc->m_pageController->addRotationJob(job);
         }
 
         delete pixmap;
     }
 }
 
 void Page::setTextPage(TextPage *textPage)
 {
     delete d->m_text;
 
     d->m_text = textPage;
     if (d->m_text) {
         d->m_text->d->m_page = this;
         // Correct/optimize text order for search and text selection
         d->m_text->d->correctTextOrder();
     }
 }
 
 void Page::setObjectRects(const QList<ObjectRect *> &rects)
 {
     QSet<ObjectRect::ObjectType> which;
     which << ObjectRect::Action << ObjectRect::Image;
     deleteObjectRects(m_rects, which);
 
     /**
      * Rotate the object rects of the page.
      */
     const QTransform matrix = d->rotationMatrix();
 
     for (ObjectRect *objectRect : rects) {
         objectRect->transform(matrix);
     }
 
     m_rects << rects;
 }
 
 const QList<ObjectRect *> &Page::objectRects() const
 {
     return m_rects;
 }
 
 void PagePrivate::setHighlight(int s_id, RegularAreaRect *rect, const QColor &color)
 {
     HighlightAreaRect *hr = new HighlightAreaRect(rect);
     hr->s_id = s_id;
     hr->color = color;
 
     m_page->m_highlights.append(hr);
 }
 
 void PagePrivate::setTextSelections(RegularAreaRect *r, const QColor &color)
 {
     deleteTextSelections();
     if (r) {
         HighlightAreaRect *hr = new HighlightAreaRect(r);
         hr->s_id = -1;
         hr->color = color;
         m_textSelections = hr;
         delete r;
     }
 }
 
 void Page::setSourceReferences(const QList<SourceRefObjectRect *> &refRects)
 {
     deleteSourceReferences();
     for (SourceRefObjectRect *rect : refRects) {
         m_rects << rect;
     }
 }
 
 void Page::setDuration(double seconds)
 {
     d->m_duration = seconds;
 }
 
 double Page::duration() const
 {
     return d->m_duration;
 }
 
 void Page::setLabel(const QString &label)
 {
     d->m_label = label;
 }
 
 QString Page::label() const
 {
     return d->m_label;
 }
 
 const RegularAreaRect *Page::textSelection() const
 {
     return d->m_textSelections;
 }
 
 QColor Page::textSelectionColor() const
 {
     return d->m_textSelections ? d->m_textSelections->color : QColor();
 }
 
 void Page::addAnnotation(Annotation *annotation)
 {
     // Generate uniqueName: okular-{UUID}
     if (annotation->uniqueName().isEmpty()) {
         QString uniqueName = QStringLiteral("okular-") + QUuid::createUuid().toString();
         annotation->setUniqueName(uniqueName);
     }
     annotation->d_ptr->m_page = d;
     m_annotations.append(annotation);
 
     AnnotationObjectRect *rect = new AnnotationObjectRect(annotation);
 
     // Rotate the annotation on the page.
     const QTransform matrix = d->rotationMatrix();
     annotation->d_ptr->annotationTransform(matrix);
 
     m_rects.append(rect);
 }
 
 bool Page::removeAnnotation(Annotation *annotation)
 {
     if (!d->m_doc->m_parent->canRemovePageAnnotation(annotation)) {
         return false;
     }
 
     QList<Annotation *>::iterator aIt = m_annotations.begin();
     for (; aIt != m_annotations.end(); ++aIt) {
         if ((*aIt) && (*aIt)->uniqueName() == annotation->uniqueName()) {
             int rectfound = false;
             QList<ObjectRect *>::iterator it = m_rects.begin();
             for (; it != m_rects.end() && !rectfound; ++it) {
                 if (((*it)->objectType() == ObjectRect::OAnnotation) && ((*it)->object() == (*aIt))) {
                     delete *it;
                     it = m_rects.erase(it);
                     rectfound = true;
                 }
             }
             qCDebug(OkularCoreDebug) << "removed annotation:" << annotation->uniqueName();
             annotation->d_ptr->m_page = nullptr;
             m_annotations.erase(aIt);
             break;
         }
     }
 
     return true;
 }
 
 void Page::setTransition(PageTransition *transition)
 {
     delete d->m_transition;
     d->m_transition = transition;
 }
 
 void Page::setPageAction(PageAction action, Action *link)
 {
     switch (action) {
     case Page::Opening:
         delete d->m_openingAction;
         d->m_openingAction = link;
         break;
     case Page::Closing:
         delete d->m_closingAction;
         d->m_closingAction = link;
         break;
     }
 }
 
 void Page::setFormFields(const QList<FormField *> &fields)
 {
     qDeleteAll(d->formfields);
     d->formfields = fields;
     for (FormField *ff : std::as_const(d->formfields)) {
         ff->d_ptr->setDefault();
         ff->d_ptr->m_page = this;
     }
 }
 
 void Page::deletePixmap(DocumentObserver *observer)
 {
     TilesManager *tm = d->tilesManager(observer);
     if (tm) {
         delete tm;
         d->m_tilesManagers.remove(observer);
     } else {
         PagePrivate::PixmapObject object = d->m_pixmaps.take(observer);
         delete object.m_pixmap;
     }
 }
 
 void Page::deletePixmaps()
 {
     QMapIterator<DocumentObserver *, PagePrivate::PixmapObject> it(d->m_pixmaps);
     while (it.hasNext()) {
         it.next();
         delete it.value().m_pixmap;
     }
 
     d->m_pixmaps.clear();
 
     qDeleteAll(d->m_tilesManagers);
     d->m_tilesManagers.clear();
 }
 
 void Page::deleteRects()
 {
     // delete ObjectRects of type Link and Image
     QSet<ObjectRect::ObjectType> which;
     which << ObjectRect::Action << ObjectRect::Image;
     deleteObjectRects(m_rects, which);
 }
 
 void PagePrivate::deleteHighlights(int s_id)
 {
     // delete highlights by ID
     QList<HighlightAreaRect *>::iterator it = m_page->m_highlights.begin();
     while (it != m_page->m_highlights.end()) {
         HighlightAreaRect *highlight = *it;
         if (s_id == -1 || highlight->s_id == s_id) {
             it = m_page->m_highlights.erase(it);
             delete highlight;
         } else {
             ++it;
         }
     }
 }
 
 void PagePrivate::deleteTextSelections()
 {
     delete m_textSelections;
     m_textSelections = nullptr;
 }
 
 void Page::deleteSourceReferences()
 {
     deleteObjectRects(m_rects, QSet<ObjectRect::ObjectType>() << ObjectRect::SourceRef);
 }
 
 void Page::deleteAnnotations()
 {
     // delete ObjectRects of type Annotation
     deleteObjectRects(m_rects, QSet<ObjectRect::ObjectType>() << ObjectRect::OAnnotation);
     // delete all stored annotations
     qDeleteAll(m_annotations);
     m_annotations.clear();
 }
 
 bool PagePrivate::restoreLocalContents(const QDomNode &pageNode)
 {
     bool loadedAnything = false; // set if something actually gets loaded
 
     // iterate over all children (annotationList, ...)
     QDomNode childNode = pageNode.firstChild();
     while (childNode.isElement()) {
         QDomElement childElement = childNode.toElement();
         childNode = childNode.nextSibling();
 
         // parse annotationList child element
         if (childElement.tagName() == QLatin1String("annotationList")) {
 #ifdef PAGE_PROFILE
             QTime time;
             time.start();
 #endif
             // Clone annotationList as root node in restoredLocalAnnotationList
             const QDomNode clonedNode = restoredLocalAnnotationList.importNode(childElement, true);
             restoredLocalAnnotationList.appendChild(clonedNode);
 
             // iterate over all annotations
             QDomNode annotationNode = childElement.firstChild();
             while (annotationNode.isElement()) {
                 // get annotation element and advance to next annot
                 QDomElement annotElement = annotationNode.toElement();
                 annotationNode = annotationNode.nextSibling();
 
                 // get annotation from the dom element
                 Annotation *annotation = AnnotationUtils::createAnnotation(annotElement);
 
                 // append annotation to the list or show warning
                 if (annotation) {
                     m_doc->performAddPageAnnotation(m_number, annotation);
                     qCDebug(OkularCoreDebug) << "restored annot:" << annotation->uniqueName();
                     loadedAnything = true;
                 } else {
                     qCWarning(OkularCoreDebug).nospace() << "page (" << m_number << "): can't restore an annotation from XML.";
                 }
             }
 #ifdef PAGE_PROFILE
             qCDebug(OkularCoreDebug).nospace() << "annots: XML Load time: " << time.elapsed() << "ms";
 #endif
         }
         // parse formList child element
         else if (childElement.tagName() == QLatin1String("forms")) {
             // Clone forms as root node in restoredFormFieldList
             const QDomNode clonedNode = restoredFormFieldList.importNode(childElement, true);
             restoredFormFieldList.appendChild(clonedNode);
 
             if (formfields.isEmpty()) {
                 continue;
             }
 
             QHash<int, FormField *> hashedforms;
             for (FormField *ff : std::as_const(formfields)) {
                 hashedforms[ff->id()] = ff;
             }
 
             // iterate over all forms
             QDomNode formsNode = childElement.firstChild();
             while (formsNode.isElement()) {
                 // get annotation element and advance to next annot
                 QDomElement formElement = formsNode.toElement();
                 formsNode = formsNode.nextSibling();
 
                 if (formElement.tagName() != QLatin1String("form")) {
                     continue;
                 }
 
                 bool ok = true;
                 int index = formElement.attribute(QStringLiteral("id")).toInt(&ok);
                 if (!ok) {
                     continue;
                 }
 
                 QHash<int, FormField *>::const_iterator wantedIt = hashedforms.constFind(index);
                 if (wantedIt == hashedforms.constEnd()) {
                     continue;
                 }
 
                 QString value = formElement.attribute(QStringLiteral("value"));
                 (*wantedIt)->d_ptr->setValue(value);
                 loadedAnything = true;
             }
         }
     }
 
     return loadedAnything;
 }
 
 void PagePrivate::saveLocalContents(QDomNode &parentNode, QDomDocument &document, PageItems what) const
 {
     // create the page node and set the 'number' attribute
     QDomElement pageElement = document.createElement(QStringLiteral("page"));
     pageElement.setAttribute(QStringLiteral("number"), m_number);
 
     // add annotations info if has got any
     if ((what & AnnotationPageItems) && (what & OriginalAnnotationPageItems)) {
         const QDomElement savedDocRoot = restoredLocalAnnotationList.documentElement();
         if (!savedDocRoot.isNull()) {
             // Import and append node in target document
             const QDomNode importedNode = document.importNode(savedDocRoot, true);
             pageElement.appendChild(importedNode);
         }
     } else if ((what & AnnotationPageItems) && !m_page->m_annotations.isEmpty()) {
         // create the annotationList
         QDomElement annotListElement = document.createElement(QStringLiteral("annotationList"));
 
         // add every annotation to the annotationList
         for (const Annotation *a : std::as_const(m_page->m_annotations)) {
             // only save okular annotations (not the embedded in file ones)
             if (!(a->flags() & Annotation::External)) {
                 // append an filled-up element called 'annotation' to the list
                 QDomElement annElement = document.createElement(QStringLiteral("annotation"));
                 AnnotationUtils::storeAnnotation(a, annElement, document);
                 annotListElement.appendChild(annElement);
                 qCDebug(OkularCoreDebug) << "save annotation:" << a->uniqueName();
             }
         }
 
         // append the annotationList element if annotations have been set
         if (annotListElement.hasChildNodes()) {
             pageElement.appendChild(annotListElement);
         }
     }
 
     // add forms info if has got any
     if ((what & FormFieldPageItems) && (what & OriginalFormFieldPageItems)) {
         const QDomElement savedDocRoot = restoredFormFieldList.documentElement();
         if (!savedDocRoot.isNull()) {
             // Import and append node in target document
             const QDomNode importedNode = document.importNode(savedDocRoot, true);
             pageElement.appendChild(importedNode);
         }
     } else if ((what & FormFieldPageItems) && !formfields.isEmpty()) {
         // create the formList
         QDomElement formListElement = document.createElement(QStringLiteral("forms"));
 
         // add every form data to the formList
         for (const FormField *f : formfields) {
             QString newvalue = f->d_ptr->value();
             if (f->d_ptr->m_default == newvalue) {
                 continue;
             }
 
             // append an filled-up element called 'annotation' to the list
             QDomElement formElement = document.createElement(QStringLiteral("form"));
             formElement.setAttribute(QStringLiteral("id"), f->id());
             formElement.setAttribute(QStringLiteral("value"), newvalue);
             formListElement.appendChild(formElement);
         }
 
         // append the annotationList element if annotations have been set
         if (formListElement.hasChildNodes()) {
             pageElement.appendChild(formListElement);
         }
     }
 
     // append the page element only if has children
     if (pageElement.hasChildNodes()) {
         parentNode.appendChild(pageElement);
     }
 }
 
 const QPixmap *Page::_o_nearestPixmap(DocumentObserver *observer, int w, int h) const
 {
     Q_UNUSED(h)
 
     const QPixmap *pixmap = nullptr;
 
     // if a pixmap is present for given id, use it
     QMap<DocumentObserver *, PagePrivate::PixmapObject>::const_iterator itPixmap = d->m_pixmaps.constFind(observer);
     if (itPixmap != d->m_pixmaps.constEnd()) {
         pixmap = itPixmap.value().m_pixmap;
     } else if (!d->m_pixmaps.isEmpty()) {
         // else find the closest match using pixmaps of other IDs (great optim!)
         int minDistance = -1;
         QMap<DocumentObserver *, PagePrivate::PixmapObject>::const_iterator it = d->m_pixmaps.constBegin(), end = d->m_pixmaps.constEnd();
         for (; it != end; ++it) {
             int pixWidth = (*it).m_pixmap->width(), distance = pixWidth > w ? pixWidth - w : w - pixWidth;
             if (minDistance == -1 || distance < minDistance) {
                 pixmap = (*it).m_pixmap;
                 minDistance = distance;
             }
         }
     }
 
     return pixmap;
 }
 
 bool Page::hasTilesManager(const DocumentObserver *observer) const
 {
     return d->tilesManager(observer) != nullptr;
 }
 
 QList<Tile> Page::tilesAt(const DocumentObserver *observer, const NormalizedRect &rect) const
 {
     TilesManager *tm = d->m_tilesManagers.value(observer);
     if (tm) {
         return tm->tilesAt(rect, TilesManager::PixmapTile);
     } else {
         return QList<Tile>();
     }
 }
 
 TilesManager *PagePrivate::tilesManager(const DocumentObserver *observer) const
 {
     return m_tilesManagers.value(observer);
 }
 
 void PagePrivate::setTilesManager(const DocumentObserver *observer, TilesManager *tm)
 {
     TilesManager *old = m_tilesManagers.value(observer);
     delete old;
 
     m_tilesManagers.insert(observer, tm);
 }
 
 void PagePrivate::adoptGeneratedContents(PagePrivate *oldPage)
 {
     rotateAt(oldPage->m_rotation);
 
     m_pixmaps = oldPage->m_pixmaps;
     oldPage->m_pixmaps.clear();
 
     m_tilesManagers = oldPage->m_tilesManagers;
     oldPage->m_tilesManagers.clear();
 
     m_boundingBox = oldPage->m_boundingBox;
     m_isBoundingBoxKnown = oldPage->m_isBoundingBoxKnown;
     m_text = oldPage->m_text;
     oldPage->m_text = nullptr;
 
     m_textSelections = oldPage->m_textSelections;
     oldPage->m_textSelections = nullptr;
 
     restoredLocalAnnotationList = oldPage->restoredLocalAnnotationList;
     restoredFormFieldList = oldPage->restoredFormFieldList;
 }
 
 FormField *PagePrivate::findEquivalentForm(const Page *p, FormField *oldField)
 {
     // given how id is not very good of id (at least for pdf) we do a few passes
     // same rect, type and id
     for (FormField *f : std::as_const(p->d->formfields)) {
         if (f->rect() == oldField->rect() && f->type() == oldField->type() && f->id() == oldField->id()) {
             return f;
         }
     }
     // same rect and type
     for (FormField *f : std::as_const(p->d->formfields)) {
         if (f->rect() == oldField->rect() && f->type() == oldField->type()) {
             return f;
         }
     }
     // fuzzy rect, same type and id
     for (FormField *f : std::as_const(p->d->formfields)) {
         if (f->type() == oldField->type() && f->id() == oldField->id() && qFuzzyCompare(f->rect().left, oldField->rect().left) && qFuzzyCompare(f->rect().top, oldField->rect().top) &&
             qFuzzyCompare(f->rect().right, oldField->rect().right) && qFuzzyCompare(f->rect().bottom, oldField->rect().bottom)) {
             return f;
         }
     }
     // fuzzy rect and same type
     for (FormField *f : std::as_const(p->d->formfields)) {
         if (f->type() == oldField->type() && qFuzzyCompare(f->rect().left, oldField->rect().left) && qFuzzyCompare(f->rect().top, oldField->rect().top) && qFuzzyCompare(f->rect().right, oldField->rect().right) &&
             qFuzzyCompare(f->rect().bottom, oldField->rect().bottom)) {
             return f;
         }
     }
     return nullptr;
 }