DocDiff application: draw differences onto pages

2025-06-05 21:59:17 +02:00 · 2021-10-14 19:12:56 +02:00
parent bafcc36d3f
commit e838f5130a
7 changed files with 537 additions and 306 deletions
--- a/Pdf4QtDocDiff/utils.h
+++ b/Pdf4QtDocDiff/utils.h
@ -0,0 +1,107 @@
+//    Copyright (C) 2021 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#include "settings.h"
+#include "pdfdiff.h"
+#include "pdfdrawspacecontroller.h"
+#include "pdfdocumentdrawinterface.h"
+
+namespace pdfdocdiff
+{
+
+class ComparedDocumentMapper
+{
+public:
+
+    enum class Mode
+    {
+        Left,
+        Right,
+        Combined,
+        Overlay
+    };
+
+    void update(Mode mode,
+                bool filterDifferences,
+                const pdf::PDFDiffResult& diff,
+                const pdf::PDFDocument* leftDocument,
+                const pdf::PDFDocument* rightDocument,
+                const pdf::PDFDocument* currentDocument);
+
+    const pdf::PDFDrawSpaceController::LayoutItems& getLayout() const { return m_layout; }
+    void setPageSequence(const pdf::PDFDiffResult::PageSequence& sequence) { m_pageSequence = sequence; }
+
+    /// Returns left page index (that means page index in left document),
+    /// if it doesn't exist, -1 is returned.
+    /// \param pageIndex Actual page index
+    pdf::PDFInteger getLeftPageIndex(pdf::PDFInteger pageIndex) const;
+
+    /// Returns right page index (that means page index in right document),
+    /// if it doesn't exist, -1 is returned.
+    /// \param pageIndex Actual page index
+    pdf::PDFInteger getRightPageIndex(pdf::PDFInteger pageIndex) const;
+
+    /// Returns actual page index from left page index, or -1.
+    /// \param leftPageIndex Left page index
+    pdf::PDFInteger getPageIndexFromLeftPageIndex(pdf::PDFInteger leftPageIndex) const;
+
+    /// Returns actual page index from right page index, or -1.
+    /// \param rightPageIndex Right page index
+    pdf::PDFInteger getPageIndexFromRightPageIndex(pdf::PDFInteger rightPageIndex) const;
+
+private:
+    pdf::PDFDrawSpaceController::LayoutItems m_layout;
+    bool m_allLeft = false;
+    bool m_allRight = false;
+    std::map<pdf::PDFInteger, pdf::PDFInteger> m_leftPageIndices;
+    std::map<pdf::PDFInteger, pdf::PDFInteger> m_rightPageIndices;
+    pdf::PDFDiffResult::PageSequence m_pageSequence;
+};
+
+class DifferencesDrawInterface : public pdf::IDocumentDrawInterface
+{
+public:
+    explicit DifferencesDrawInterface(const Settings* settings,
+                                      const ComparedDocumentMapper* mapper,
+                                      const pdf::PDFDiffResult* diffResult);
+
+    virtual void drawPage(QPainter* painter, pdf::PDFInteger pageIndex,
+                          const pdf::PDFPrecompiledPage* compiledPage,
+                          pdf::PDFTextLayoutGetter& layoutGetter,
+                          const QMatrix& pagePointToDevicePointMatrix,
+                          QList<pdf::PDFRenderError>& errors) const override;
+    virtual void drawPostRendering(QPainter* painter, QRect rect) const override;
+
+private:
+    void drawRectangle(QPainter* painter,
+                       const QMatrix& pagePointToDevicePointMatrix,
+                       const QRectF& rect,
+                       size_t resultIndex) const;
+
+    QColor getColorForIndex(size_t index) const;
+
+    const Settings* m_settings;
+    const ComparedDocumentMapper* m_mapper;
+    const pdf::PDFDiffResult* m_diffResult;
+};
+
+}   // namespace pdfdocdiff
+
+#endif // UTILS_H