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Transparency groups

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This commit is contained in:
Jakub Melka
2019-09-29 18:09:09 +02:00
parent c1dfe0280c
commit 024c613171
4 changed files with 212 additions and 14 deletions
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63
PdfForQtLib/sources/pdfpagecontentprocessor.cpp
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@ -374,6 +374,18 @@ void PDFPageContentProcessor::performSetCacheDevice(PDFReal wx, PDFReal wy, PDFR
Q_UNUSED(ury);
}
void PDFPageContentProcessor::performBeginTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup)
{
Q_UNUSED(order);
Q_UNUSED(transparencyGroup);
}
void PDFPageContentProcessor::performEndTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup)
{
Q_UNUSED(order);
Q_UNUSED(transparencyGroup);
}
bool PDFPageContentProcessor::isContentSuppressed() const
{
return std::any_of(m_markedContentStack.cbegin(), m_markedContentStack.cend(), [](const MarkedContentState& state) { return state.contentSuppressed; });
@ -554,10 +566,38 @@ void PDFPageContentProcessor::processContentStream(const PDFStream* stream)
}
}
void PDFPageContentProcessor::processForm(const QMatrix& matrix, const QRectF& boundingBox, const PDFObject& resources, const QByteArray& content)
void PDFPageContentProcessor::processForm(const QMatrix& matrix,
const QRectF& boundingBox,
const PDFObject& resources,
const PDFObject& transparencyGroup,
const QByteArray& content)
{
PDFPageContentProcessorStateGuard guard(this);
std::unique_ptr<PDFTransparencyGroupGuard> guard2;
if (transparencyGroup.isDictionary())
{
// Parse the transparency group
const PDFDictionary* transparencyDictionary = transparencyGroup.getDictionary();
PDFDocumentDataLoaderDecorator loader(m_document);
PDFTransparencyGroup group;
const PDFObject& colorSpaceObject = m_document->getObject(transparencyDictionary->get("CS"));
if (!colorSpaceObject.isNull())
{
group.colorSpacePointer = PDFAbstractColorSpace::createColorSpace(m_colorSpaceDictionary, m_document, colorSpaceObject);
}
group.isolated = loader.readBooleanFromDictionary(transparencyDictionary, "I", false);
group.knockout = loader.readBooleanFromDictionary(transparencyDictionary, "K", false);
guard2.reset(new PDFTransparencyGroupGuard(this, qMove(group)));
// If we are in transparency group, we must reset transparency settings in the graphic state.
// Graphic state is then updated in the lines below.
m_graphicState.setBlendMode(BlendMode::Normal);
m_graphicState.setAlphaFilling(1.0);
m_graphicState.setAlphaStroking(1.0);
}
QMatrix formMatrix = matrix * m_graphicState.getCurrentTransformationMatrix();
m_graphicState.setCurrentTransformationMatrix(formMatrix);
updateGraphicState();
@ -2640,7 +2680,10 @@ void PDFPageContentProcessor::operatorPaintXObject(PDFPageContentProcessor::PDFO
// Read resources
PDFObject resources = m_document->getObject(streamDictionary->get("Resources"));
processForm(transformationMatrix, boundingBox, resources, content);
// Transparency group
PDFObject transparencyGroup = m_document->getObject(streamDictionary->get("Group"));
processForm(transformationMatrix, boundingBox, resources, transparencyGroup, content);
}
else
{
@ -3298,4 +3341,20 @@ PDFPageContentProcessor::PDFPageContentProcessorStateGuard::~PDFPageContentProce
m_processor->operatorRestoreGraphicState();
}
PDFPageContentProcessor::PDFTransparencyGroupGuard::PDFTransparencyGroupGuard(PDFPageContentProcessor* processor, PDFTransparencyGroup&& group) :
m_processor(processor)
{
m_processor->performBeginTransparencyGroup(ProcessOrder::BeforeOperation, group);
m_processor->m_transparencyGroupStack.push(qMove(group));
m_processor->performBeginTransparencyGroup(ProcessOrder::AfterOperation, m_processor->m_transparencyGroupStack.top());
}
PDFPageContentProcessor::PDFTransparencyGroupGuard::~PDFTransparencyGroupGuard()
{
m_processor->performEndTransparencyGroup(ProcessOrder::BeforeOperation, m_processor->m_transparencyGroupStack.top());
PDFTransparencyGroup group = qMove(m_processor->m_transparencyGroupStack.top());
m_processor->m_transparencyGroupStack.pop();
m_processor->performEndTransparencyGroup(ProcessOrder::AfterOperation, group);
}
} // namespace pdf