mirror of https://github.com/JakubMelka/PDF4QT.git
109 lines
4.7 KiB
C++
109 lines
4.7 KiB
C++
// Copyright (C) 2019 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt 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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// (at your option) any later version.
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//
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// PdfForQt 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 PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFPAINTER_H
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#define PDFPAINTER_H
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#include "pdfutils.h"
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#include "pdfrenderer.h"
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#include "pdfpagecontentprocessor.h"
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#include <QPen>
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#include <QBrush>
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namespace pdf
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{
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/// Processor, which processes PDF's page commands on the QPainter. It works with QPainter
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/// and with transformation matrix, which translates page points to the device points.
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/// Only basic transparency is supported, advanced transparency, such as transparency groups,
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/// are not supported. Painter will try to emulate them so painting will not fail completely.
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class PDFPainter : public PDFPageContentProcessor
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{
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public:
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/// Constructs new PDFPainter object, with default parameters.
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/// \param painter Painter, on which page content is drawn
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/// \param features Features of the painter
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/// \param pagePointToDevicePointMatrix Matrix, which translates page points to device points
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/// \param page Page, which will be drawn
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/// \param document Document owning the page
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/// \param fontCache Font cache
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/// \param optionalContentActivity Activity of optional content
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/// \param meshQualitySettings Mesh quality settings
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explicit PDFPainter(QPainter* painter,
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PDFRenderer::Features features,
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QMatrix pagePointToDevicePointMatrix,
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const PDFPage* page,
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const PDFDocument* document,
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const PDFFontCache* fontCache,
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const PDFOptionalContentActivity* optionalContentActivity,
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const PDFMeshQualitySettings& meshQualitySettings);
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virtual ~PDFPainter() override;
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protected:
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virtual void performPathPainting(const QPainterPath& path, bool stroke, bool fill, bool text, Qt::FillRule fillRule) override;
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virtual void performClipping(const QPainterPath& path, Qt::FillRule fillRule) override;
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virtual void performImagePainting(const QImage& image) override;
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virtual void performMeshPainting(const PDFMesh& mesh) override;
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virtual void performUpdateGraphicsState(const PDFPageContentProcessorState& state) override;
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virtual void performSaveGraphicState(ProcessOrder order) override;
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virtual void performRestoreGraphicState(ProcessOrder order) override;
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virtual void performBeginTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
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virtual void performEndTransparencyGroup(ProcessOrder order, const PDFTransparencyGroup& transparencyGroup);
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virtual bool isContentSuppressedByOC(PDFObjectReference ocgOrOcmd) override;
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private:
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/// Returns current pen
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const QPen& getCurrentPen() { return m_currentPen.get(this, &PDFPainter::getCurrentPenImpl); }
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/// Returns current brush
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const QBrush& getCurrentBrush() { return m_currentBrush.get(this, &PDFPainter::getCurrentBrushImpl); }
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/// Returns current pen (implementation)
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QPen getCurrentPenImpl() const;
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/// Returns current brush (implementation)
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QBrush getCurrentBrushImpl() const;
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/// Returns effective stroking alpha from transparency groups and current graphic state
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PDFReal getEffectiveStrokingAlpha() const;
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/// Returns effective filling alpha from transparency groups and current graphic state
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PDFReal getEffectiveFillingAlpha() const;
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/// Returns true, if blend mode can be set according the transparency group stack
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bool canSetBlendMode(BlendMode mode) const;
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struct PDFTransparencyGroupPainterData
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{
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PDFTransparencyGroup group;
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PDFReal alphaStroke = 1.0;
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PDFReal alphaFill = 1.0;
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BlendMode blendMode = BlendMode::Normal;
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};
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QPainter* m_painter;
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PDFRenderer::Features m_features;
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PDFCachedItem<QPen> m_currentPen;
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PDFCachedItem<QBrush> m_currentBrush;
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std::vector<PDFTransparencyGroupPainterData> m_transparencyGroupDataStack;
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};
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} // namespace pdf
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#endif // PDFPAINTER_H
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