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AcroForms implementation (data structures start)

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Jakub Melka
2020-04-18 19:01:49 +02:00
parent 9b71031ec3
commit 247c2c98f7
15 changed files with 724 additions and 105 deletions
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156
PdfForQtLib/sources/pdfannotation.cpp
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@ -976,7 +976,8 @@ void PDFAnnotationManager::drawPage(QPainter* painter,
PDFInteger pageIndex,
const PDFPrecompiledPage* compiledPage,
PDFTextLayoutGetter& layoutGetter,
const QMatrix& pagePointToDevicePointMatrix) const
const QMatrix& pagePointToDevicePointMatrix,
QList<PDFRenderError>& errors) const
{
Q_UNUSED(compiledPage);
Q_UNUSED(layoutGetter);
@ -1003,82 +1004,95 @@ void PDFAnnotationManager::drawPage(QPainter* painter,
for (const PageAnnotation& annotation : annotations.annotations)
{
const PDFAnnotation::Flags annotationFlags = annotation.annotation->getEffectiveFlags();
if (annotationFlags.testFlag(PDFAnnotation::Hidden) || // Annotation is completely hidden
(m_target == Target::Print && !annotationFlags.testFlag(PDFAnnotation::Print)) || // Target is print and annotation is marked as not printed
(m_target == Target::View && annotationFlags.testFlag(PDFAnnotation::NoView)) || // Target is view, and annotation is disabled for screen
annotation.annotation->isReplyTo()) // Annotation is reply to another annotation, display just the first annotation
try
{
const PDFAnnotation::Flags annotationFlags = annotation.annotation->getEffectiveFlags();
if (annotationFlags.testFlag(PDFAnnotation::Hidden) || // Annotation is completely hidden
(m_target == Target::Print && !annotationFlags.testFlag(PDFAnnotation::Print)) || // Target is print and annotation is marked as not printed
(m_target == Target::View && annotationFlags.testFlag(PDFAnnotation::NoView)) || // Target is view, and annotation is disabled for screen
annotation.annotation->isReplyTo()) // Annotation is reply to another annotation, display just the first annotation
{
continue;
}
PDFObject appearanceStreamObject = m_document->getObject(getAppearanceStream(annotation));
if (!appearanceStreamObject.isStream())
{
// Object is not valid appearance stream. We will try to draw default
// annotation appearance.
painter->save();
painter->setRenderHint(QPainter::Antialiasing, true);
painter->setWorldMatrix(pagePointToDevicePointMatrix, true);
AnnotationDrawParameters parameters;
parameters.painter = painter;
parameters.key = std::make_pair(annotation.appearance, annotation.annotation->getAppearanceState());
annotation.annotation->draw(parameters);
painter->restore();
continue;
}
PDFDocumentDataLoaderDecorator loader(m_document);
const PDFStream* formStream = appearanceStreamObject.getStream();
const PDFDictionary* formDictionary = formStream->getDictionary();
QRectF annotationRectangle = annotation.annotation->getRectangle();
QRectF formBoundingBox = loader.readRectangle(formDictionary->get("BBox"), QRectF());
QMatrix formMatrix = loader.readMatrixFromDictionary(formDictionary, "Matrix", QMatrix());
QByteArray content = m_document->getDecodedStream(formStream);
PDFObject resources = m_document->getObject(formDictionary->get("Resources"));
PDFObject transparencyGroup = m_document->getObject(formDictionary->get("Group"));
if (formBoundingBox.isEmpty() || annotationRectangle.isEmpty())
{
// Form bounding box is empty
continue;
}
QMatrix userSpaceToDeviceSpace = prepareTransformations(pagePointToDevicePointMatrix, painter->device(), annotationFlags, page, annotationRectangle);
if (annotationFlags.testFlag(PDFAnnotation::NoZoom))
{
features.setFlag(PDFRenderer::ClipToCropBox, false);
}
// Jakub Melka: perform algorithm 8.1, defined in PDF 1.7 reference,
// chapter 8.4.4 Appearance streams.
// Step 1) - calculate transformed appearance box
QRectF transformedAppearanceBox = formMatrix.mapRect(formBoundingBox);
// Step 2) - calculate matrix A, which maps from form space to annotation space
// Matrix A transforms from transformed appearance box space to the
// annotation rectangle.
const PDFReal scaleX = annotationRectangle.width() / transformedAppearanceBox.width();
const PDFReal scaleY = annotationRectangle.height() / transformedAppearanceBox.height();
const PDFReal translateX = annotationRectangle.left() - transformedAppearanceBox.left() * scaleX;
const PDFReal translateY = annotationRectangle.bottom() - transformedAppearanceBox.bottom() * scaleY;
QMatrix A(scaleX, 0.0, 0.0, scaleY, translateX, translateY);
// Step 3) - compute final matrix AA
QMatrix AA = formMatrix * A;
PDFPainter pdfPainter(painter, features, userSpaceToDeviceSpace, page, m_document, m_fontCache, cms.get(), m_optionalActivity, m_meshQualitySettings);
pdfPainter.initializeProcessor();
// Jakub Melka: we must check, that we do not display annotation disabled by optional content
PDFObjectReference oc = annotation.annotation->getOptionalContent();
if (!oc.isValid() || !pdfPainter.isContentSuppressedByOC(oc))
{
pdfPainter.processForm(AA, formBoundingBox, resources, transparencyGroup, content);
}
}
catch (PDFException exception)
{
errors.push_back(PDFRenderError(RenderErrorType::Error, exception.getMessage()));
continue;
}
PDFObject appearanceStreamObject = m_document->getObject(getAppearanceStream(annotation));
if (!appearanceStreamObject.isStream())
catch (PDFRendererException exception)
{
// Object is not valid appearance stream. We will try to draw default
// annotation appearance.
painter->save();
painter->setRenderHint(QPainter::Antialiasing, true);
painter->setWorldMatrix(pagePointToDevicePointMatrix, true);
AnnotationDrawParameters parameters;
parameters.painter = painter;
parameters.key = std::make_pair(annotation.appearance, annotation.annotation->getAppearanceState());
annotation.annotation->draw(parameters);
painter->restore();
errors.push_back(exception.getError());
continue;
}
PDFDocumentDataLoaderDecorator loader(m_document);
const PDFStream* formStream = appearanceStreamObject.getStream();
const PDFDictionary* formDictionary = formStream->getDictionary();
QRectF annotationRectangle = annotation.annotation->getRectangle();
QRectF formBoundingBox = loader.readRectangle(formDictionary->get("BBox"), QRectF());
QMatrix formMatrix = loader.readMatrixFromDictionary(formDictionary, "Matrix", QMatrix());
QByteArray content = m_document->getDecodedStream(formStream);
PDFObject resources = m_document->getObject(formDictionary->get("Resources"));
PDFObject transparencyGroup = m_document->getObject(formDictionary->get("Group"));
if (formBoundingBox.isEmpty() || annotationRectangle.isEmpty())
{
// Form bounding box is empty
continue;
}
QMatrix userSpaceToDeviceSpace = prepareTransformations(pagePointToDevicePointMatrix, painter->device(), annotationFlags, page, annotationRectangle);
if (annotationFlags.testFlag(PDFAnnotation::NoZoom))
{
features.setFlag(PDFRenderer::ClipToCropBox, false);
}
// Jakub Melka: perform algorithm 8.1, defined in PDF 1.7 reference,
// chapter 8.4.4 Appearance streams.
// Step 1) - calculate transformed appearance box
QRectF transformedAppearanceBox = formMatrix.mapRect(formBoundingBox);
// Step 2) - calculate matrix A, which maps from form space to annotation space
// Matrix A transforms from transformed appearance box space to the
// annotation rectangle.
const PDFReal scaleX = annotationRectangle.width() / transformedAppearanceBox.width();
const PDFReal scaleY = annotationRectangle.height() / transformedAppearanceBox.height();
const PDFReal translateX = annotationRectangle.left() - transformedAppearanceBox.left() * scaleX;
const PDFReal translateY = annotationRectangle.bottom() - transformedAppearanceBox.bottom() * scaleY;
QMatrix A(scaleX, 0.0, 0.0, scaleY, translateX, translateY);
// Step 3) - compute final matrix AA
QMatrix AA = formMatrix * A;
PDFPainter pdfPainter(painter, features, userSpaceToDeviceSpace, page, m_document, m_fontCache, cms.get(), m_optionalActivity, m_meshQualitySettings);
pdfPainter.initializeProcessor();
// Jakub Melka: we must check, that we do not display annotation disabled by optional content
PDFObjectReference oc = annotation.annotation->getOptionalContent();
if (!oc.isValid() || !pdfPainter.isContentSuppressedByOC(oc))
{
pdfPainter.processForm(AA, formBoundingBox, resources, transparencyGroup, content);
}
}
m_fontCache->setCacheShrinkEnabled(this, true);