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DocDiff application: calculating page graphic piece info

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Jakub Melka
2021-09-08 20:33:32 +02:00
parent e354a03564
commit b2a9342047
5 changed files with 295 additions and 22 deletions
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139
Pdf4QtLib/sources/pdfdiff.cpp
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@ -16,7 +16,13 @@
// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
#include "pdfdiff.h"
#include "pdfrenderer.h"
#include "pdfdocumenttextflow.h"
#include "pdfexecutionpolicy.h"
#include "pdffont.h"
#include "pdfcms.h"
#include "pdfcompiler.h"
#include "pdfconstants.h"
#include <QtConcurrent/QtConcurrent>
@ -29,6 +35,7 @@ PDFDiff::PDFDiff(QObject* parent) :
m_leftDocument(nullptr),
m_rightDocument(nullptr),
m_options(Asynchronous),
m_epsilon(0.0001),
m_cancelled(false)
{
@ -141,30 +148,11 @@ PDFDiffResult PDFDiff::perform()
{
ProgressStartupInfo info;
info.showDialog = false;
info.text = tr("");
info.text = tr("Comparing documents.");
m_progress->start(StepLast, std::move(info));
}
// StepExtractContentLeftDocument
stepProgress();
// StepExtractContentRightDocument
stepProgress();
// StepExtractTextLeftDocument
pdf::PDFDocumentTextFlowFactory factoryLeftDocumentTextFlow;
factoryLeftDocumentTextFlow.setCalculateBoundingBoxes(true);
PDFDocumentTextFlow leftTextFlow = factoryLeftDocumentTextFlow.create(m_leftDocument, leftPages, PDFDocumentTextFlowFactory::Algorithm::Auto);
stepProgress();
// StepExtractTextRightDocument
pdf::PDFDocumentTextFlowFactory factoryRightDocumentTextFlow;
factoryRightDocumentTextFlow.setCalculateBoundingBoxes(true);
PDFDocumentTextFlow rightTextFlow = factoryRightDocumentTextFlow.create(m_rightDocument, rightPages, PDFDocumentTextFlowFactory::Algorithm::Auto);
stepProgress();
// StepCompare
stepProgress();
performSteps(leftPages, rightPages);
if (m_progress)
{
@ -182,6 +170,102 @@ void PDFDiff::stepProgress()
}
}
struct PDFDiffPageContext
{
PDFInteger pageIndex = 0;
PDFPrecompiledPage::GraphicPieceInfos graphicPieces;
};
void PDFDiff::performSteps(const std::vector<PDFInteger>& leftPages, const std::vector<PDFInteger>& rightPages)
{
std::vector<PDFDiffPageContext> leftPreparedPages;
std::vector<PDFDiffPageContext> rightPreparedPages;
auto createDiffPageContext = [](auto pageIndex)
{
PDFDiffPageContext context;
context.pageIndex = pageIndex;
return context;
};
std::transform(leftPages.cbegin(), leftPages.cend(), std::back_inserter(leftPreparedPages), createDiffPageContext);
std::transform(rightPages.cbegin(), rightPages.cend(), std::back_inserter(rightPreparedPages), createDiffPageContext);
// StepExtractContentLeftDocument
if (!m_cancelled)
{
PDFFontCache fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT);
PDFOptionalContentActivity optionalContentActivity(m_leftDocument, pdf::OCUsage::View, nullptr);
fontCache.setDocument(pdf::PDFModifiedDocument(const_cast<pdf::PDFDocument*>(m_leftDocument), &optionalContentActivity));
PDFCMSManager cmsManager(nullptr);
cmsManager.setDocument(m_leftDocument);
PDFCMSPointer cms = cmsManager.getCurrentCMS();
auto fillPageContext = [&, this](PDFDiffPageContext& context)
{
PDFPrecompiledPage compiledPage;
constexpr PDFRenderer::Features features = PDFRenderer::IgnoreOptionalContent;
PDFRenderer renderer(m_leftDocument, &fontCache, cms.data(), &optionalContentActivity, features, pdf::PDFMeshQualitySettings());
renderer.compile(&compiledPage, context.pageIndex);
PDFReal epsilon = calculateEpsilonForPage(m_leftDocument->getCatalog()->getPage(context.pageIndex));
context.graphicPieces = compiledPage.calculateGraphicPieceInfos(epsilon);
};
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Page, leftPreparedPages.begin(), leftPreparedPages.end(), fillPageContext);
stepProgress();
}
// StepExtractContentRightDocument
if (!m_cancelled)
{
PDFFontCache fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT);
PDFOptionalContentActivity optionalContentActivity(m_rightDocument, pdf::OCUsage::View, nullptr);
fontCache.setDocument(pdf::PDFModifiedDocument(const_cast<pdf::PDFDocument*>(m_rightDocument), &optionalContentActivity));
PDFCMSManager cmsManager(nullptr);
cmsManager.setDocument(m_rightDocument);
PDFCMSPointer cms = cmsManager.getCurrentCMS();
auto fillPageContext = [&, this](PDFDiffPageContext& context)
{
PDFPrecompiledPage compiledPage;
constexpr PDFRenderer::Features features = PDFRenderer::IgnoreOptionalContent;
PDFRenderer renderer(m_rightDocument, &fontCache, cms.data(), &optionalContentActivity, features, pdf::PDFMeshQualitySettings());
renderer.compile(&compiledPage, context.pageIndex);
PDFReal epsilon = calculateEpsilonForPage(m_leftDocument->getCatalog()->getPage(context.pageIndex));
context.graphicPieces = compiledPage.calculateGraphicPieceInfos(epsilon);
};
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Page, rightPreparedPages.begin(), rightPreparedPages.end(), fillPageContext);
stepProgress();
}
// StepExtractTextLeftDocument
if (!m_cancelled)
{
pdf::PDFDocumentTextFlowFactory factoryLeftDocumentTextFlow;
factoryLeftDocumentTextFlow.setCalculateBoundingBoxes(true);
PDFDocumentTextFlow leftTextFlow = factoryLeftDocumentTextFlow.create(m_leftDocument, leftPages, PDFDocumentTextFlowFactory::Algorithm::Auto);
stepProgress();
}
// StepExtractTextRightDocument
if (!m_cancelled)
{
pdf::PDFDocumentTextFlowFactory factoryRightDocumentTextFlow;
factoryRightDocumentTextFlow.setCalculateBoundingBoxes(true);
PDFDocumentTextFlow rightTextFlow = factoryRightDocumentTextFlow.create(m_rightDocument, rightPages, PDFDocumentTextFlowFactory::Algorithm::Auto);
stepProgress();
}
// StepCompare
if (!m_cancelled)
{
stepProgress();
}
}
void PDFDiff::onComparationPerformed()
{
m_cancelled = false;
@ -189,6 +273,19 @@ void PDFDiff::onComparationPerformed()
emit comparationFinished();
}
PDFReal PDFDiff::calculateEpsilonForPage(const PDFPage* page) const
{
Q_ASSERT(page);
QRectF mediaBox = page->getMediaBox();
PDFReal width = mediaBox.width();
PDFReal height = mediaBox.height();
PDFReal factor = qMax(width, height);
return factor * m_epsilon;
}
PDFDiffResult::PDFDiffResult() :
m_result(true)
{