qsvghandler_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QSVGHANDLER_P_H
#define QSVGHANDLER_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include "QtCore/qxmlstream.h"
#include "QtCore/qhash.h"
#include "QtCore/qstack.h"
#include <QtCore/QLoggingCategory>
#include "qsvgstyle_p.h"
#if QT_CONFIG(cssparser)
#include "private/qcssparser_p.h"
#endif
#include "qsvggraphics_p.h"
#include "qtsvgglobal_p.h"
 
QT_BEGIN_NAMESPACE
 
class QSvgNode;
class QSvgTinyDocument;
class QSvgHandler;
class QColor;
class QSvgStyleSelector;
 
#ifndef QT_NO_CSSPARSER
 
struct QSvgCssAttribute
{
    QString name;
    QString value;
};
 
#endif
 
class Q_SVG_PRIVATE_EXPORT QSvgHandler
{
public:
    enum LengthType {
        LT_PERCENT,
        LT_PX,
        LT_PC,
        LT_PT,
        LT_MM,
        LT_CM,
        LT_IN,
        LT_OTHER
    };
 
public:
    QSvgHandler(QIODevice *device);
    QSvgHandler(const QByteArray &data);
    QSvgHandler(QXmlStreamReader *const data);
    ~QSvgHandler();
 
    QIODevice *device() const;
    QSvgTinyDocument *document() const;
 
    inline bool ok() const {
        return document() != 0 && !xml->hasError();
    }
 
    inline QString errorString() const { return xml->errorString(); }
    inline int lineNumber() const { return xml->lineNumber(); }
 
    void setDefaultCoordinateSystem(LengthType type);
    LengthType defaultCoordinateSystem() const;
 
    void pushColor(const QColor &color);
    void pushColorCopy();
    void popColor();
    QColor currentColor() const;
 
#ifndef QT_NO_CSSPARSER
    void setInStyle(bool b);
    bool inStyle() const;
 
    QSvgStyleSelector *selector() const;
#endif
 
    void setAnimPeriod(int start, int end);
    int animationDuration() const;
 
#ifndef QT_NO_CSSPARSER
    void parseCSStoXMLAttrs(const QString &css, QList<QSvgCssAttribute> *attributes);
#endif
 
    inline QPen defaultPen() const
    { return m_defaultPen; }
 
public:
    bool startElement(const QString &localName, const QXmlStreamAttributes &attributes);
    bool endElement(QStringView localName);
    bool characters(QStringView str);
    bool processingInstruction(const QString &target, const QString &data);
 
private:
    void init();
 
    QSvgTinyDocument *m_doc;
    QStack<QSvgNode *> m_nodes;
    // TODO: This is only needed during parsing, so it unnecessarily takes up space after that.
    // Temporary container for <use> nodes which haven't been resolved yet.
    QList<QSvgUse *> m_toBeResolved;
 
    enum CurrentNode
    {
        Unknown,
        Graphics,
        Style
    };
    QStack<CurrentNode> m_skipNodes;
 
    QStack<QSvgText::WhitespaceMode> m_whitespaceMode;
 
    QSvgRefCounter<QSvgStyleProperty> m_style;
 
    LengthType m_defaultCoords;
 
    QStack<QColor> m_colorStack;
    QStack<int>    m_colorTagCount;
 
    int m_animEnd;
 
    QXmlStreamReader *const xml;
#ifndef QT_NO_CSSPARSER
    bool m_inStyle;
    QSvgStyleSelector *m_selector;
    QCss::Parser m_cssParser;
#endif
    void parse();
    void resolveGradients(QSvgNode *node, int nestedDepth = 0);
    void resolveNodes();
 
    QPen m_defaultPen;
    const bool m_ownsReader;
};
 
Q_DECLARE_LOGGING_CATEGORY(lcSvgHandler)
 
QT_END_NAMESPACE
 
#endif // QSVGHANDLER_P_H