mirror of
https://github.com/JakubMelka/PDF4QT.git
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127 lines
4.7 KiB
C++
127 lines
4.7 KiB
C++
// Copyright (C) 2018-2019 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 PDFPAGE_H
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#define PDFPAGE_H
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#include "pdfobject.h"
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#include <QRectF>
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#include <set>
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#include <optional>
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namespace pdf
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{
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class PDFDocument;
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/// This enum represents number of degree, which should be page rotated CLOCKWISE,
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/// when being displayed or printed.
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enum class PageRotation
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{
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None,
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Rotate90,
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Rotate180,
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Rotate270
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};
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/// This class represents attributes, which are inheritable. Also allows merging from
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/// parents.
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class PDFPageInheritableAttributes
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{
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public:
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explicit inline PDFPageInheritableAttributes() = default;
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/// Parses inheritable attributes from the page tree node
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/// \param templateAttributes Template attributes
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/// \param dictionary Dictionary, from which the data will be read
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/// \param document Document owning this data
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static PDFPageInheritableAttributes parse(const PDFPageInheritableAttributes& templateAttributes, const PDFObject& dictionary, const PDFDocument* document);
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const QRectF& getMediaBox() const { return m_mediaBox; }
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const QRectF& getCropBox() const { return m_cropBox; }
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PageRotation getPageRotation() const;
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const PDFObject& getResources() const { return m_resources; }
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private:
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QRectF m_mediaBox;
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QRectF m_cropBox;
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std::optional<PageRotation> m_pageRotation;
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PDFObject m_resources;
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};
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/// Object representing page in PDF document. Contains different page properties, such as
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/// media box, crop box, rotation, etc. and also page content, resources.
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class PDFPage
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{
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public:
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explicit PDFPage() = default;
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/// Parses the page tree. If error occurs, then exception is thrown.
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/// \param document Document owning this tree
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/// \param root Root object of page tree
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static std::vector<PDFPage> parse(const PDFDocument* document, const PDFObject& root);
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inline const QRectF& getMediaBox() const { return m_mediaBox; }
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inline const QRectF& getCropBox() const { return m_cropBox; }
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inline const QRectF& getBleedBox() const { return m_bleedBox; }
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inline const QRectF& getTrimBox() const { return m_trimBox; }
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inline const QRectF& getArtBox() const { return m_artBox; }
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inline PageRotation getPageRotation() const { return m_pageRotation; }
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inline const PDFObject& getResources() const { return m_resources; }
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inline const PDFObject& getContents() const { return m_contents; }
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QRectF getRectMM(const QRectF& rect) const;
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inline QRectF getMediaBoxMM() const { return getRectMM(m_mediaBox); }
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inline QRectF getCropBoxMM() const { return getRectMM(m_cropBox); }
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inline QRectF getBleedBoxMM() const { return getRectMM(m_bleedBox); }
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inline QRectF getTrimBoxMM() const { return getRectMM(m_trimBox); }
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inline QRectF getArtBoxMM() const { return getRectMM(m_artBox); }
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QRectF getRotatedMediaBox() const;
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static QRectF getRotatedBox(const QRectF& rect, PageRotation rotation);
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private:
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/// Parses the page tree (implementation). If error occurs, then exception is thrown.
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/// \param pages Page array. Pages are inserted into this array
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/// \param visitedReferences Visited references (to check cycles in page tree and avoid hangup)
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/// \param templateAttributes Template attributes (inheritable attributes defined in parent)
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/// \param root Root object of page tree
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/// \param document Document owning this tree
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static void parseImpl(std::vector<PDFPage>& pages,
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std::set<PDFObjectReference>& visitedReferences,
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const PDFPageInheritableAttributes& templateAttributes,
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const PDFObject& root,
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const PDFDocument* document);
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QRectF m_mediaBox;
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QRectF m_cropBox;
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QRectF m_bleedBox;
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QRectF m_trimBox;
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QRectF m_artBox;
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PageRotation m_pageRotation = PageRotation::None;
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PDFObject m_resources;
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PDFObject m_contents;
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};
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} // namespace pdf
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#endif // PDFPAGE_H
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