qsvghandler.cpp

奇趣公司比较新的qt/emd版本

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtSVG module of the Qt Toolkit.
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****************************************************************************/

#include "qsvghandler_p.h"

#include "qsvgtinydocument_p.h"
#include "qsvgstructure_p.h"
#include "qsvggraphics_p.h"
#include "qsvgnode_p.h"
#include "qsvgfont_p.h"

#include "qapplication.h"
#include "qwidget.h"
#include "qpen.h"
#include "qpainterpath.h"
#include "qbrush.h"
#include "qcolor.h"
#include "qtextformat.h"
#include "qvector.h"
#include "qfileinfo.h"
#include "qfile.h"
#include "qdebug.h"
#include "private/qmath_p.h"

#include <math.h>

double qstrtod(const char *s00, char const **se, bool *ok);

static bool parsePathDataFast(const QStringRef &data, QPainterPath &path);

static QPen defaultPen(Qt::black, 1, Qt::NoPen,
                       Qt::FlatCap, Qt::SvgMiterJoin);

static QString xmlSimplify(const QString &str)
{
    QString dummy = str;
    dummy.remove(QLatin1Char('\n'));
    if (dummy.trimmed().isEmpty())
        return QString();
    QString temp;
    QString::const_iterator itr = dummy.constBegin();
    bool wasSpace = false;
    for (;itr != dummy.constEnd(); ++itr) {
        if ((*itr).isSpace()) {
            if (wasSpace || !(*itr).isPrint()) {
                continue;
            }
            temp += *itr;
            wasSpace = true;
        } else {
            temp += *itr;
            wasSpace = false;
        }
    }
    return temp;
}

struct QSvgAttributes
{
    QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHandler *handler);

    QStringRef value(const QLatin1String &name) const;
    QStringRef value(const QString &namespaceUri, const QLatin1String &name) const;

    QXmlStreamAttributes m_xmlAttributes;
    QVector<QSvgCssAttribute> m_cssAttributes;
};

QSvgAttributes::QSvgAttributes(const QXmlStreamAttributes &xmlAttributes, QSvgHandler *handler)
    : m_xmlAttributes(xmlAttributes)
{
    QStringRef style = xmlAttributes.value(QLatin1String("style"));
    if (!style.isEmpty())
        handler->parseCSStoXMLAttrs(style.toString(), &m_cssAttributes);
}

QStringRef QSvgAttributes::value(const QLatin1String &name) const
{
    QStringRef v = m_xmlAttributes.value(name);
    if (v.isEmpty()) {
        for (int i = 0; i < m_cssAttributes.count(); ++i) {
            if (m_cssAttributes.at(i).name == name) {
                v = m_cssAttributes.at(i).value;
                break;
            }
        }
    }
    return v;
}

QStringRef QSvgAttributes::value(const QString &namespaceUri, const QLatin1String &name) const
{
    QStringRef v = m_xmlAttributes.value(namespaceUri, name);
    if (v.isEmpty()) {
        for (int i = 0; i < m_cssAttributes.count(); ++i) {
            if (m_cssAttributes.at(i).name == name) {
                v = m_cssAttributes.at(i).value;
                break;
            }
        }
    }
    return v;
}

static inline QString someId(const QXmlStreamAttributes &attributes)
{
    QString id = attributes.value(QLatin1String("id")).toString();
    if (id.isEmpty())
        id = attributes.value(QLatin1String("xml:id")).toString();
    return id;
}
static inline QString someId(const QSvgAttributes &attributes)
{ return someId(attributes.m_xmlAttributes); }



static const char * QSvgStyleSelector_nodeString[] = {
    "svg",
    "g",
    "defs",
    "switch",
    "animation",
    "arc",
    "circle",
    "ellipse",
    "image",
    "line",
    "path",
    "polygon",
    "polyline",
    "rect",
    "text",
    "textarea",
    "use",
    "video"
};

class QSvgStyleSelector : public QCss::StyleSelector
{
public:
    virtual ~QSvgStyleSelector()
    {
    }

    inline QString nodeToName(QSvgNode *node) const
    {
        return QLatin1String(QSvgStyleSelector_nodeString[node->type()]);
    }

    inline QSvgNode *svgNode(NodePtr node) const
    {
        return (QSvgNode*)node.ptr;
    }
    inline QSvgStructureNode *nodeToStructure(QSvgNode *n) const
    {
        if (n &&
            (n->type() == QSvgNode::DOC ||
             n->type() == QSvgNode::G ||
             n->type() == QSvgNode::DEFS ||
             n->type() == QSvgNode::SWITCH)) {
            return (QSvgStructureNode*)n;
        }
        return 0;
    }

    inline QSvgStructureNode *svgStructure(NodePtr node) const
    {
        QSvgNode *n = svgNode(node);
        QSvgStructureNode *st = nodeToStructure(n);
        return st;
    }

    virtual bool nodeNameEquals(NodePtr node, const QString& nodeName) const
    {
        QSvgNode *n = svgNode(node);
        if (!n)
            return false;
        QString name = nodeToName(n);
        return QString::compare(name, nodeName, Qt::CaseInsensitive) == 0;
    }
    virtual QString attribute(NodePtr node, const QString &name) const
    {
        QSvgNode *n = svgNode(node);
        if ((!n->nodeId().isEmpty() && (name == QLatin1String("id") ||
                                        name == QLatin1String("xml:id"))))
            return n->nodeId();
        if (!n->xmlClass().isEmpty() && name == QLatin1String("class"))
            return n->xmlClass();
        return QString();
    }
    virtual bool hasAttribute(NodePtr node, const QString &name) const
    {
        QSvgNode *n = svgNode(node);
        if ((!n->nodeId().isEmpty() && (name == QLatin1String("id") ||
                                        name == QLatin1String("xml:id"))))
            return true;
        if (!n->xmlClass().isEmpty() && name == QLatin1String("class"))
            return true;
        return false;
    }
    virtual bool hasAttributes(NodePtr node) const
    {
        QSvgNode *n = svgNode(node);
        return (n &&
                (!n->nodeId().isEmpty() || !n->xmlClass().isEmpty()));
    }

    virtual QStringList nodeIds(NodePtr node) const
    {
        QSvgNode *n = svgNode(node);
        QString nid;
        if (n)
            nid = n->nodeId();
        QStringList lst; lst.append(nid);
        return lst;
    }

    virtual bool isNullNode(NodePtr node) const
    {
        return !node.ptr;
    }

    virtual NodePtr parentNode(NodePtr node) const
    {
        QSvgNode *n = svgNode(node);
        NodePtr newNode;
        newNode.ptr = 0;
        newNode.id = 0;
        if (n) {
            QSvgNode *svgParent = n->parent();
            if (svgParent) {
                newNode.ptr = svgParent;
            }
        }
        return newNode;
    }
    virtual NodePtr previousSiblingNode(NodePtr node) const
    {
        NodePtr newNode;
        newNode.ptr = 0;
        newNode.id = 0;

        QSvgNode *n = svgNode(node);
        if (!n)
            return newNode;
        QSvgStructureNode *svgParent = nodeToStructure(n->parent());

        if (svgParent) {
            newNode.ptr = svgParent->previousSiblingNode(n);
        }
        return newNode;
    }
    virtual NodePtr duplicateNode(NodePtr node) const
    {
        NodePtr n;
        n.ptr = node.ptr;
        n.id  = node.id;
        return n;
    }
    virtual void freeNode(NodePtr node) const
    {
        Q_UNUSED(node);
    }
};

static qreal toDouble(const QChar *&str)
{
    const int maxLen = 255;//technically doubles can go til 308+ but whatever
    char temp[maxLen+1];
    int pos = 0;

    if (*str == QLatin1Char('-')) {
        temp[pos++] = '-';
        ++str;
    } else if (*str == QLatin1Char('+')) {
        ++str;
    }
    while (*str >= QLatin1Char('0') && *str <= QLatin1Char('9') && pos < maxLen) {
        temp[pos++] = str->toLatin1();
        ++str;
    }
    if (*str == QLatin1Char('.') && pos < maxLen) {
        temp[pos++] = '.';
        ++str;
    }
    while (*str >= QLatin1Char('0') && *str <= QLatin1Char('9') && pos < maxLen) {
        temp[pos++] = str->toLatin1();
        ++str;
    }
    bool exponent = false;
    if (*str == QLatin1Char('e') && pos < maxLen) {
        exponent = true;
        temp[pos++] = 'e';
        ++str;
        if ((*str == QLatin1Char('-') || *str == QLatin1Char('+')) && pos < maxLen) {
            temp[pos++] = str->toLatin1();
            ++str;
        }
        while (*str >= QLatin1Char('0') && *str <= QLatin1Char('9') && pos < maxLen) {
            temp[pos++] = str->toLatin1();
            ++str;
        }
    }
    temp[pos] = '\0';

    qreal val;
    if (!exponent && pos < 10) {
        int ival = 0;
        const char *t = temp;
        bool neg = false;
        if(*t == '-') {
            neg = true;
            ++t;
        }
        while(*t && *t != '.') {
            ival *= 10;
            ival += (*t) - '0';
            ++t;
        }
        if(*t == '.') {
            ++t;
            int div = 1;
            while(*t) {
                ival *= 10;
                ival += (*t) - '0';
                div *= 10;
                ++t;
            }
            val = ((qreal)ival)/((qreal)div);
        } else {
            val = ival;
        }
        if (neg)
            val = -val;
    } else {
#ifdef Q_WS_QWS
        if(sizeof(qreal) == sizeof(float))
            val = strtof(temp, 0);
        else
#endif
        {
            bool ok = false;
            val = qstrtod(temp, 0, &ok);
        }
    }
    return val;

}
static qreal toDouble(const QString &str)
{
    const QChar *c = str.constData();