Simple rendering

PdfForQtLib/sources/pdfpainter.h

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+//    Copyright (C) 2019 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt 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
+//    (at your option) any later version.
+//
+//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFPAINTER_H
+#define PDFPAINTER_H
+
+#include "pdfutils.h"
+#include "pdfrenderer.h"
+#include "pdfpagecontentprocessor.h"
+
+#include <QPen>
+#include <QBrush>
+
+namespace pdf
+{
+
+/// Processor, which processes PDF's page commands on the QPainter. It works with QPainter
+/// and with transformation matrix, which translates page points to the device points.
+class PDFPainter : public PDFPageContentProcessor
+{
+public:
+    /// Constructs new PDFPainter object, with default parameters.
+    explicit PDFPainter(QPainter* painter, PDFRenderer::Features features, QMatrix pagePointToDevicePointMatrix, const PDFPage* page, const PDFDocument* document);
+    virtual ~PDFPainter() override;
+
+protected:
+    virtual void performPathPainting(const QPainterPath& path, bool stroke, bool fill, Qt::FillRule fillRule) override;
+    virtual void performClipping(const QPainterPath& path, Qt::FillRule fillRule) override;
+    virtual void performUpdateGraphicsState(const PDFPageContentProcessorState& state) override;
+    virtual void performSaveGraphicState(ProcessOrder order) override;
+    virtual void performRestoreGraphicState(ProcessOrder order) override;
+
+private:
+    /// Returns current pen
+    const QPen& getCurrentPen() { return m_currentPen.get(this, &PDFPainter::getCurrentPenImpl); }
+
+    /// Returns current brush
+    const QBrush& getCurrentBrush() { return m_currentBrush.get(this, &PDFPainter::getCurrentBrushImpl); }
+
+    /// Returns current pen (implementation)
+    QPen getCurrentPenImpl() const;
+
+    /// Returns current brush (implementation)
+    QBrush getCurrentBrushImpl() const;
+
+    QPainter* m_painter;
+    PDFRenderer::Features m_features;
+    QMatrix m_pagePointToDevicePointMatrix;
+    PDFCachedItem<QPen> m_currentPen;
+    PDFCachedItem<QBrush> m_currentBrush;
+};
+
+}   // namespace pdf
+
+#endif // PDFPAINTER_H