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Issue #10: Ability to cancel the operation

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This commit is contained in:
Jakub Melka
2022-02-04 20:03:23 +01:00
parent 284f0c4db8
commit 49cab7937a
15 changed files with 302 additions and 61 deletions
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66
Pdf4QtLib/sources/pdfpagecontentprocessor.cpp
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@ -232,6 +232,7 @@ PDFPageContentProcessor::PDFPageContentProcessor(const PDFPage* page,
m_fontCache(fontCache),
m_CMS(CMS),
m_optionalContentActivity(optionalContentActivity),
m_operationControl(nullptr),
m_colorSpaceDictionary(nullptr),
m_fontDictionary(nullptr),
m_xobjectDictionary(nullptr),
@ -311,6 +312,12 @@ QList<PDFRenderError> PDFPageContentProcessor::processContents()
for (size_t i = 0; i < count; ++i)
{
if (isProcessingCancelled())
{
// Break, if processing is being cancelled
break;
}
const PDFObject& streamObject = m_document->getObject(array->getItem(i));
if (streamObject.isStream())
{
@ -523,7 +530,7 @@ void PDFPageContentProcessor::processContent(const QByteArray& content)
{
PDFLexicalAnalyzer parser(content.constBegin(), content.constEnd());
while (!parser.isAtEnd())
while (!parser.isAtEnd() && !isProcessingCancelled())
{
bool tokenFetched = false;
PDFInteger oldParserPosition = parser.pos();
@ -844,7 +851,7 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
if (!performPathPaintingUsingShading(path, false, true, shadingPattern))
{
PDFMesh mesh = shadingPattern->createMesh(settings, m_CMS, m_graphicState.getRenderingIntent(), this);
PDFMesh mesh = shadingPattern->createMesh(settings, m_CMS, m_graphicState.getRenderingIntent(), this, m_operationControl);
// Now, merge the current path to the mesh clipping path
QPainterPath boundingPath = mesh.getBoundingPath();
@ -961,7 +968,7 @@ void PDFPageContentProcessor::processPathPainting(const QPainterPath& path, bool
if (!performPathPaintingUsingShading(strokedPath, true, false, shadingPattern))
{
PDFMesh mesh = shadingPattern->createMesh(settings, m_CMS, m_graphicState.getRenderingIntent(), this);
PDFMesh mesh = shadingPattern->createMesh(settings, m_CMS, m_graphicState.getRenderingIntent(), this, m_operationControl);
QPainterPath boundingPath = mesh.getBoundingPath();
if (boundingPath.isEmpty())
@ -1095,6 +1102,16 @@ void PDFPageContentProcessor::processTillingPatternPainting(const PDFTilingPatte
performClipping(boundingPath, boundingPath.fillRule());
processContent(content);
if (isProcessingCancelled())
{
break;
}
}
if (isProcessingCancelled())
{
break;
}
}
}
@ -1831,6 +1848,16 @@ void PDFPageContentProcessor::finishMarkedContent()
}
}
void PDFPageContentProcessor::setOperationControl(const PDFOperationControl* newOperationControl)
{
m_operationControl = newOperationControl;
}
bool PDFPageContentProcessor::isProcessingCancelled() const
{
return m_operationControl && m_operationControl->isOperationCancelled();
}
void PDFPageContentProcessor::reportRenderErrorOnce(RenderErrorType type, QString message)
{
if (!m_onceReportedErrors.count(message))
@ -2952,24 +2979,27 @@ void PDFPageContentProcessor::paintXObjectImage(const PDFStream* stream)
if (!performOriginalImagePainting(pdfImage))
{
QImage image = pdfImage.getImage(m_CMS, this);
QImage image = pdfImage.getImage(m_CMS, this, m_operationControl);
if (image.format() == QImage::Format_Alpha8)
if (!isProcessingCancelled())
{
QSize size = image.size();
QImage unmaskedImage(size, QImage::Format_ARGB32_Premultiplied);
unmaskedImage.fill(m_graphicState.getFillColor());
unmaskedImage.setAlphaChannel(image);
image = qMove(unmaskedImage);
}
if (image.format() == QImage::Format_Alpha8)
{
QSize size = image.size();
QImage unmaskedImage(size, QImage::Format_ARGB32_Premultiplied);
unmaskedImage.fill(m_graphicState.getFillColor());
unmaskedImage.setAlphaChannel(image);
image = qMove(unmaskedImage);
}
if (!image.isNull())
{
performImagePainting(image);
}
else
{
throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Can't decode the image."));
if (!image.isNull())
{
performImagePainting(image);
}
else
{
throw PDFRendererException(RenderErrorType::Error, PDFTranslationContext::tr("Can't decode the image."));
}
}
}
}