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Ability to draw on a page trough page content stream builder

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Jakub Melka
2020-11-16 13:20:14 +01:00
parent cb3a36f891
commit 018c8fae3e
5 changed files with 141 additions and 1 deletions
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77
PdfForQtLib/sources/pdfdocumentbuilder.cpp
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@ -666,6 +666,82 @@ std::array<PDFReal, 4> PDFDocumentBuilder::getAnnotationReductionRectangle(const
return { qAbs(innerRect.left() - boundingRect.left()), qAbs(boundingRect.bottom() - innerRect.bottom()), qAbs(boundingRect.right() - innerRect.right()), qAbs(boundingRect.top() - innerRect.top()) };
}
PDFPageContentStreamBuilder::PDFPageContentStreamBuilder(PDFDocumentBuilder* builder) :
m_documentBuilder(builder),
m_contentStreamBuilder(nullptr)
{
}
QPainter* PDFPageContentStreamBuilder::begin(PDFObjectReference page)
{
if (m_contentStreamBuilder)
{
// Invalid call to begin function
return nullptr;
}
const PDFObjectStorage* storage = m_documentBuilder->getStorage();
const PDFDictionary* pageDictionary = storage->getDictionaryFromObject(storage->getObject(page));
if (!pageDictionary)
{
return nullptr;
}
PDFDocumentDataLoaderDecorator loader(storage);
QRectF mediaBox = loader.readRectangle(pageDictionary->get("MediaBox"), QRectF());
if (!mediaBox.isValid())
{
return nullptr;
}
m_pageReference = page;
m_contentStreamBuilder = new PDFContentStreamBuilder(mediaBox.size(), PDFContentStreamBuilder::CoordinateSystem::Qt);
return m_contentStreamBuilder->begin();
}
QPainter* PDFPageContentStreamBuilder::beginNewPage(QRectF mediaBox)
{
return begin(m_documentBuilder->appendPage(mediaBox));
}
void PDFPageContentStreamBuilder::end(QPainter* painter)
{
if (!m_contentStreamBuilder)
{
return;
}
PDFContentStreamBuilder::ContentStream contentStream = m_contentStreamBuilder->end(painter);
delete m_contentStreamBuilder;
m_contentStreamBuilder = nullptr;
// Update page's content stream
std::vector<PDFObject> copiedObjects = m_documentBuilder->copyFrom({ contentStream.resources, contentStream.contents }, contentStream.document.getStorage(), true);
Q_ASSERT(copiedObjects.size() == 2);
PDFObjectReference resourcesReference = copiedObjects[0].getReference();
PDFObjectReference contentsReference = copiedObjects[1].getReference();
PDFObjectFactory pageUpdateFactory;
pageUpdateFactory.beginDictionary();
pageUpdateFactory.beginDictionaryItem("Contents");
pageUpdateFactory << contentsReference;
pageUpdateFactory.endDictionaryItem();
pageUpdateFactory.beginDictionaryItem("Resources");
pageUpdateFactory << resourcesReference;
pageUpdateFactory.endDictionaryItem();
pageUpdateFactory.endDictionary();
m_documentBuilder->mergeTo(m_pageReference, pageUpdateFactory.takeObject());
}
void PDFDocumentBuilder::updateAnnotationAppearanceStreams(PDFObjectReference annotationReference)
{
PDFAnnotationPtr annotation = PDFAnnotation::parse(&m_storage, annotationReference);
@ -4436,7 +4512,6 @@ void PDFDocumentBuilder::updateTrailerDictionary(PDFInteger objectCount)
updateDocumentInfo(qMove(updatedInfoDictionary));
}
/* END GENERATED CODE */
} // namespace pdf