katie/src/svg/qsvgstructure.cpp

/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2016-2020 Ivailo Monev
**
** This file is part of the QtSvg module of the Katie Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
**
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsvgstructure_p.h"

#ifndef QT_NO_SVG

#include "qsvgnode_p.h"
#include "qsvgstyle_p.h"
#include "qsvgtinydocument_p.h"

#include "qpainter.h"
#include "qlocale.h"
#include "qdebug.h"

QT_BEGIN_NAMESPACE

QSvgG::QSvgG(QSvgNode *parent)
    : QSvgStructureNode(parent)
{

}

QSvgStructureNode::~QSvgStructureNode()
{
    qDeleteAll(m_renderers);
}

void QSvgG::draw(QPainter *p, QSvgExtraStates &states)
{
    QList<QSvgNode*>::iterator itr = m_renderers.begin();
    applyStyle(p, states);

    while (itr != m_renderers.end()) {
        QSvgNode *node = *itr;
        if ((node->isVisible()) && (node->displayMode() != QSvgNode::NoneMode))
            node->draw(p, states);
        ++itr;
    }
    revertStyle(p, states);
}

QSvgNode::Type QSvgG::type() const
{
    return G;
}

QSvgStructureNode::QSvgStructureNode(QSvgNode *parent)
    :QSvgNode(parent)
{

}

QSvgNode * QSvgStructureNode::scopeNode(const QString &id) const
{
    QSvgTinyDocument *doc = document();
    return doc ? doc->namedNode(id) : 0;
}

void QSvgStructureNode::addChild(QSvgNode *child, const QString &id)
{
    m_renderers.append(child);

    if (id.isEmpty())
        return; //we can't add it to scope without id

    QSvgTinyDocument *doc = document();
    if (doc)
        doc->addNamedNode(id, child);
}

QSvgDefs::QSvgDefs(QSvgNode *parent)
    : QSvgStructureNode(parent)
{
}

void QSvgDefs::draw(QPainter *, QSvgExtraStates &)
{
    //noop
}

QSvgNode::Type QSvgDefs::type() const
{
    return DEFS;
}

/*
  Below is a lookup function based on the gperf output using the following set:

  http://www.w3.org/Graphics/SVG/feature/1.2/#SVG
  http://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static
  http://www.w3.org/Graphics/SVG/feature/1.2/#CoreAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#Structure
  http://www.w3.org/Graphics/SVG/feature/1.2/#ConditionalProcessing
  http://www.w3.org/Graphics/SVG/feature/1.2/#ConditionalProcessingAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#Image
  http://www.w3.org/Graphics/SVG/feature/1.2/#Prefetch
  http://www.w3.org/Graphics/SVG/feature/1.2/#Shape
  http://www.w3.org/Graphics/SVG/feature/1.2/#Text
  http://www.w3.org/Graphics/SVG/feature/1.2/#PaintAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#OpacityAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#GraphicsAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#Gradient
  http://www.w3.org/Graphics/SVG/feature/1.2/#SolidColor
  http://www.w3.org/Graphics/SVG/feature/1.2/#XlinkAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#ExternalResourcesRequiredAttribute
  http://www.w3.org/Graphics/SVG/feature/1.2/#Font
  http://www.w3.org/Graphics/SVG/feature/1.2/#Hyperlinking
  http://www.w3.org/Graphics/SVG/feature/1.2/#Extensibility
*/

// ----- begin of generated code -----

/* C code produced by gperf version 3.0.2 */
/* Command-line: gperf -c -L c svg  */
/* Computed positions: -k'45-46' */

#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
      && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
      && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
      && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
      && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
      && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
      && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
      && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
      && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
      && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
      && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
      && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
      && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
      && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
      && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
      && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
      && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
      && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
      && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
      && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
      && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
      && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
      && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
/* The character set is not based on ISO-646.  */
#error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gnu-gperf@gnu.org>."
#endif

enum {
    TOTAL_KEYWORDS = 20,
    MIN_WORD_LENGTH = 47,
    MAX_WORD_LENGTH = 78,
    MIN_HASH_VALUE = 48,
    MAX_HASH_VALUE = 88
};
/* maximum key range = 41, duplicates = 0 */

inline static bool isSupportedSvgFeature(const QString &str)
{
    static const unsigned char asso_values[] = {
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89,  0, 89,  5,
        15,  5,  0, 10, 89, 89, 89, 89, 89,  0,
        15, 89, 89,  0,  0, 89,  5, 89,  0, 89,
        89, 89, 89, 89, 89, 89, 89,  0, 89, 89,
        89,  0, 89, 89,  0, 89, 89, 89,  0,  5,
        89,  0,  0, 89,  5, 89,  0, 89, 89, 89,
        5,  0, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89, 89, 89, 89, 89,
        89, 89, 89, 89, 89, 89
    };

    static const char * wordlist[] = {
        "", "", "", "", "", "", "", "", "",
        "", "", "", "", "", "", "", "", "",
        "", "", "", "", "", "", "", "", "",
        "", "", "", "", "", "", "", "", "",
        "", "", "", "", "", "", "", "", "",
        "", "", "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Text",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Shape",
        "", "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#SVG",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Structure",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#SolidColor",
        "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Hyperlinking",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#CoreAttribute",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#XlinkAttribute",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#SVG-static",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#OpacityAttribute",
        "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Gradient",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Font",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Image",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#ConditionalProcessing",
        "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Extensibility",
        "", "", "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#GraphicsAttribute",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#Prefetch",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#PaintAttribute",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#ConditionalProcessingAttribute",
        "", "", "", "", "", "", "", "", "",
        "", "", "", "",
        "http://www.w3.org/Graphics/SVG/feature/1.2/#ExternalResourcesRequiredAttribute"
    };

    if (str.length() <= MAX_WORD_LENGTH && str.length() >= MIN_WORD_LENGTH) {
        const int key = str.length()
                        + asso_values[str.at(45).unicode()]
                        + asso_values[str.at(44).unicode()];
        if (key <= MAX_HASH_VALUE && key >= 0)
            return str == QLatin1String(wordlist[key]);
    }
    return false;
}

// ----- end of generated code -----


QSvgSwitch::QSvgSwitch(QSvgNode *parent)
    : QSvgStructureNode(parent)
{
    QLocale locale;
    m_systemLanguage = locale.name().replace(QLatin1Char('_'), QLatin1Char('-'));
    int idx = m_systemLanguage.indexOf(QLatin1Char('-'));
    m_systemLanguagePrefix = m_systemLanguage.mid(0, idx);
}

void QSvgSwitch::draw(QPainter *p, QSvgExtraStates &states)
{
    QList<QSvgNode*>::iterator itr = m_renderers.begin();
    applyStyle(p, states);

    while (itr != m_renderers.end()) {
        QSvgNode *node = *itr;
        if (node->isVisible() && (node->displayMode() != QSvgNode::NoneMode)) {
            const QStringList &features  = node->requiredFeatures();
            const QStringList &extensions = node->requiredExtensions();
            const QStringList &languages = node->requiredLanguages();
            const QStringList &formats = node->requiredFormats();
            const QStringList &fonts = node->requiredFonts();

            bool okToRender = true;
            if (!features.isEmpty()) {
                QStringList::const_iterator sitr = features.constBegin();
                for (; sitr != features.constEnd(); ++sitr) {
                    if (!isSupportedSvgFeature(*sitr)) {
                        okToRender = false;
                        break;
                    }
                }
            }

            if (okToRender && !extensions.isEmpty()) {
                okToRender = false;
            }

            if (okToRender && !languages.isEmpty()) {
                QStringList::const_iterator sitr = languages.constBegin();
                okToRender = false;
                for (; sitr != languages.constEnd(); ++sitr) {
                    if ((*sitr).startsWith(m_systemLanguagePrefix)) {
                        okToRender = true;
                        break;
                    }
                }
            }

            if (okToRender && !formats.isEmpty()) {
                okToRender = false;
            }

            if (okToRender && !fonts.isEmpty()) {
                okToRender = false;
            }

            if (okToRender) {
                node->draw(p, states);
                break;
            }
        }
        ++itr;
    }
    revertStyle(p, states);
}

QSvgNode::Type QSvgSwitch::type() const
{
    return SWITCH;
}

QRectF QSvgStructureNode::bounds(QPainter *p, QSvgExtraStates &states) const
{
    QRectF bounds;
    foreach(QSvgNode *node, m_renderers)
        bounds |= node->transformedBounds(p, states);
    return bounds;
}

QSvgNode * QSvgStructureNode::previousSiblingNode(QSvgNode *n) const
{
    QSvgNode *prev = 0;
    QList<QSvgNode*>::const_iterator itr = m_renderers.constBegin();
    for (; itr != m_renderers.constEnd(); ++itr) {
        QSvgNode *node = *itr;
        if (node == n)
            return prev;
        prev = node;
    }
    return prev;
}

QT_END_NAMESPACE

#endif // QT_NO_SVG