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DocDiff application: draw differences onto pages
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Jakub Melka
378
Pdf4QtDocDiff/utils.cpp
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378
Pdf4QtDocDiff/utils.cpp
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// Copyright (C) 2021 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#include "utils.h"
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#include <QPainter>
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namespace pdfdocdiff
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{
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void ComparedDocumentMapper::update(ComparedDocumentMapper::Mode mode,
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bool filterDifferences,
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const pdf::PDFDiffResult& diff,
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const pdf::PDFDocument* leftDocument,
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const pdf::PDFDocument* rightDocument,
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const pdf::PDFDocument* currentDocument)
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{
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m_layout.clear();
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m_leftPageIndices.clear();
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m_rightPageIndices.clear();
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m_allLeft = false;
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m_allRight = false;
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if (!leftDocument || !rightDocument || !currentDocument)
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{
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return;
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}
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// Jakub Melka
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pdf::PDFDiffResult::PageSequence pageSequence = diff.getPageSequence();
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const bool isEmpty = pageSequence.empty();
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if (filterDifferences)
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{
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pdf::PDFDiffResult::PageSequence filteredPageSequence;
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std::vector<pdf::PDFInteger> leftPageIndices = diff.getChangedLeftPageIndices();
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std::vector<pdf::PDFInteger> rightPageIndices = diff.getChangedRightPageIndices();
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for (const pdf::PDFDiffResult::PageSequenceItem& item : pageSequence)
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{
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const bool isLeftModified = std::binary_search(leftPageIndices.cbegin(), leftPageIndices.cend(), item.leftPage);
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const bool isRightModified = std::binary_search(rightPageIndices.cbegin(), rightPageIndices.cend(), item.rightPage);
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if (isLeftModified || isRightModified)
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{
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filteredPageSequence.push_back(item);
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}
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}
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pageSequence = std::move(filteredPageSequence);
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}
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switch (mode)
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{
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case ComparedDocumentMapper::Mode::Left:
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{
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Q_ASSERT(leftDocument == currentDocument);
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m_allLeft = true;
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double yPos = 0.0;
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const pdf::PDFCatalog* catalog = leftDocument->getCatalog();
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if (isEmpty)
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{
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// Just copy all pages
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const size_t pageCount = catalog->getPageCount();
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for (size_t i = 0; i < pageCount; ++i)
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{
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QSizeF pageSize = catalog->getPage(i)->getRotatedMediaBoxMM().size();
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QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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m_layout.emplace_back(0, i, rect);
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yPos += pageSize.height() + 5;
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}
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}
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else
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{
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for (const pdf::PDFDiffResult::PageSequenceItem& item : pageSequence)
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{
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if (item.leftPage == -1)
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{
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continue;
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}
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QSizeF pageSize = catalog->getPage(item.leftPage)->getRotatedMediaBoxMM().size();
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QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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m_layout.emplace_back(0, item.leftPage, rect);
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yPos += pageSize.height() + 5;
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}
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}
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break;
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}
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case ComparedDocumentMapper::Mode::Right:
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{
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Q_ASSERT(rightDocument == currentDocument);
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m_allRight = true;
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double yPos = 0.0;
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const pdf::PDFCatalog* catalog = rightDocument->getCatalog();
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if (isEmpty)
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{
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// Just copy all pages
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const size_t pageCount = catalog->getPageCount();
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for (size_t i = 0; i < pageCount; ++i)
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{
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QSizeF pageSize = catalog->getPage(i)->getRotatedMediaBoxMM().size();
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QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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m_layout.emplace_back(0, i, rect);
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yPos += pageSize.height() + 5;
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}
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}
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else
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{
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for (const pdf::PDFDiffResult::PageSequenceItem& item : pageSequence)
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{
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if (item.rightPage == -1)
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{
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continue;
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}
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QSizeF pageSize = catalog->getPage(item.rightPage)->getRotatedMediaBoxMM().size();
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QRectF rect(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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m_layout.emplace_back(0, item.rightPage, rect);
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yPos += pageSize.height() + 5;
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}
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}
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break;
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}
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case ComparedDocumentMapper::Mode::Combined:
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case ComparedDocumentMapper::Mode::Overlay:
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{
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double yPos = 0.0;
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const pdf::PDFCatalog* catalog = currentDocument->getCatalog();
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pdf::PDFInteger offset = leftDocument->getCatalog()->getPageCount();
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for (const pdf::PDFDiffResult::PageSequenceItem& item : pageSequence)
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{
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double yAdvance = 0.0;
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if (item.leftPage != -1)
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{
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QSizeF pageSize = catalog->getPage(item.leftPage)->getRotatedMediaBoxMM().size();
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QRectF rect;
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if (mode == ComparedDocumentMapper::Mode::Combined)
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{
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rect = QRectF(-pageSize.width() - 5, yPos, pageSize.width(), pageSize.height());
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}
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else
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{
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rect = QRectF(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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}
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m_layout.emplace_back(0, item.leftPage, rect);
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yAdvance = pageSize.height() + 5;
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m_leftPageIndices[item.leftPage] = item.leftPage;
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}
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if (item.rightPage != -1)
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{
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pdf::PDFInteger rightPageIndex = item.rightPage + offset;
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QSizeF pageSize = catalog->getPage(rightPageIndex)->getRotatedMediaBoxMM().size();
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QRectF rect;
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if (mode == ComparedDocumentMapper::Mode::Combined)
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{
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rect = QRectF(5, yPos, pageSize.width(), pageSize.height());
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}
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else
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{
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rect = QRectF(-pageSize.width() * 0.5, yPos, pageSize.width(), pageSize.height());
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}
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m_layout.emplace_back(0, rightPageIndex, rect);
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yAdvance = qMax(yAdvance, pageSize.height() + 5);
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m_rightPageIndices[rightPageIndex] = item.rightPage;
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}
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yPos += yAdvance;
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}
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break;
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}
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default:
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Q_ASSERT(false);
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break;
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}
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}
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pdf::PDFInteger ComparedDocumentMapper::getLeftPageIndex(pdf::PDFInteger pageIndex) const
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{
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if (m_allLeft)
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{
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return pageIndex;
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}
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auto it = m_leftPageIndices.find(pageIndex);
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if (it != m_leftPageIndices.cend())
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{
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return it->second;
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}
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return -1;
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}
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pdf::PDFInteger ComparedDocumentMapper::getRightPageIndex(pdf::PDFInteger pageIndex) const
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{
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if (m_allRight)
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{
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return pageIndex;
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}
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auto it = m_rightPageIndices.find(pageIndex);
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if (it != m_rightPageIndices.cend())
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{
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return it->second;
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}
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return -1;
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}
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pdf::PDFInteger ComparedDocumentMapper::getPageIndexFromLeftPageIndex(pdf::PDFInteger leftPageIndex) const
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{
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if (m_allLeft)
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{
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return leftPageIndex;
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}
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for (const auto& indexItem : m_leftPageIndices)
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{
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if (indexItem.second == leftPageIndex)
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{
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return indexItem.first;
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}
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}
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return -1;
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}
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pdf::PDFInteger ComparedDocumentMapper::getPageIndexFromRightPageIndex(pdf::PDFInteger rightPageIndex) const
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{
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if (m_allRight)
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{
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return rightPageIndex;
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}
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for (const auto& indexItem : m_rightPageIndices)
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{
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if (indexItem.second == rightPageIndex)
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{
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return indexItem.first;
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}
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}
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return -1;
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}
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DifferencesDrawInterface::DifferencesDrawInterface(const Settings* settings,
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const ComparedDocumentMapper* mapper,
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const pdf::PDFDiffResult* diffResult) :
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m_settings(settings),
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m_mapper(mapper),
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m_diffResult(diffResult)
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{
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}
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void DifferencesDrawInterface::drawPage(QPainter* painter,
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pdf::PDFInteger pageIndex,
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const pdf::PDFPrecompiledPage* compiledPage,
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pdf::PDFTextLayoutGetter& layoutGetter,
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const QMatrix& pagePointToDevicePointMatrix,
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QList<pdf::PDFRenderError>& errors) const
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{
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Q_UNUSED(compiledPage);
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Q_UNUSED(layoutGetter);
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Q_UNUSED(errors);
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const size_t differencesCount = m_diffResult->getDifferencesCount();
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const pdf::PDFInteger leftPageIndex = m_mapper->getLeftPageIndex(pageIndex);
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const pdf::PDFInteger rightPageIndex = m_mapper->getRightPageIndex(pageIndex);
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if (leftPageIndex != -1)
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{
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for (size_t i = 0; i < differencesCount; ++i)
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{
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auto leftRectangles = m_diffResult->getLeftRectangles(i);
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for (auto it = leftRectangles.first; it != leftRectangles.second; ++it)
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{
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const auto& item = *it;
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if (item.first == leftPageIndex)
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{
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drawRectangle(painter, pagePointToDevicePointMatrix, item.second, i);
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}
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}
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}
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}
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if (rightPageIndex != -1)
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{
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for (size_t i = 0; i < differencesCount; ++i)
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{
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auto rightRectangles = m_diffResult->getRightRectangles(i);
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for (auto it = rightRectangles.first; it != rightRectangles.second; ++it)
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{
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const auto& item = *it;
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if (item.first == rightPageIndex)
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{
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drawRectangle(painter, pagePointToDevicePointMatrix, item.second, i);
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}
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}
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}
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}
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}
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QColor DifferencesDrawInterface::getColorForIndex(size_t index) const
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{
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QColor color;
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const size_t resultIndex = index;
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if (m_diffResult->isReplaceDifference(resultIndex))
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{
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color = m_settings->colorReplaced;
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}
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else if (m_diffResult->isRemoveDifference(resultIndex))
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{
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color = m_settings->colorRemoved;
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}
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else if (m_diffResult->isAddDifference(resultIndex))
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{
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color = m_settings->colorAdded;
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}
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else if (m_diffResult->isPageMoveDifference(resultIndex))
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{
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color = m_settings->colorPageMove;
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}
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return color;
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}
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void DifferencesDrawInterface::drawPostRendering(QPainter* painter, QRect rect) const
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{
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Q_UNUSED(painter);
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Q_UNUSED(rect);
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}
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void DifferencesDrawInterface::drawRectangle(QPainter* painter,
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const QMatrix& pagePointToDevicePointMatrix,
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const QRectF& rect,
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size_t resultIndex) const
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{
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QColor color = getColorForIndex(resultIndex);
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color.setAlphaF(0.3);
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QRectF resultRect = pagePointToDevicePointMatrix.mapRect(rect);
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painter->fillRect(resultRect, color);
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}
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} // namespace pdfdocdiff
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