PDF4QT/PdfForQtLib/sources/pdfpage.h

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