qicon.cpp

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**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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** 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
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** 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
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#include "qicon.h"
#include "qicon_p.h"
#include "qiconengine.h"
#include "qiconengineplugin.h"
#include "private/qfactoryloader_p.h"
#include "private/qiconloader_p.h"
#include "qapplication.h"
#include "qstyleoption.h"
#include "qpainter.h"
#include "qfileinfo.h"
#include "qstyle.h"
#include "qpixmapcache.h"
#include "qvariant.h"
#include "qcache.h"
#include "qdebug.h"
#include "private/qguiplatformplugin_p.h"

#ifdef Q_WS_MAC
#include <private/qt_mac_p.h>
#include <private/qt_cocoa_helpers_mac_p.h>
#endif

#ifdef Q_WS_X11
#include "private/qt_x11_p.h"
#include "private/qkde_p.h"
#endif

#include "private/qstylehelper_p.h"

#ifndef QT_NO_ICON
QT_BEGIN_NAMESPACE

static QBasicAtomicInt serialNumCounter = Q_BASIC_ATOMIC_INITIALIZER(1);

static void qt_cleanup_icon_cache();
typedef QCache<QString, QIcon> IconCache;
Q_GLOBAL_STATIC_WITH_INITIALIZER(IconCache, qtIconCache, qAddPostRoutine(qt_cleanup_icon_cache))

static void qt_cleanup_icon_cache()
{
    qtIconCache()->clear();
}

QIconPrivate::QIconPrivate()
    : engine(0), ref(1),
    serialNum(serialNumCounter.fetchAndAddRelaxed(1)),
    detach_no(0),
    engine_version(2),
    v1RefCount(0)
{
}

QPixmapIconEngine::QPixmapIconEngine()
{
}

QPixmapIconEngine::QPixmapIconEngine(const QPixmapIconEngine &other)
    : QIconEngineV2(other), pixmaps(other.pixmaps)
{
}

QPixmapIconEngine::~QPixmapIconEngine()
{
}

void QPixmapIconEngine::paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state)
{
    QSize pixmapSize = rect.size();
#if defined(Q_WS_MAC)
    pixmapSize *= qt_mac_get_scalefactor();
#endif
    painter->drawPixmap(rect, pixmap(pixmapSize, mode, state));
}

static inline int area(const QSize &s) { return s.width() * s.height(); }

// returns the smallest of the two that is still larger than or equal to size.
static QPixmapIconEngineEntry *bestSizeMatch( const QSize &size, QPixmapIconEngineEntry *pa, QPixmapIconEngineEntry *pb)
{
    int s = area(size);
    if (pa->size == QSize() && pa->pixmap.isNull()) {
        pa->pixmap = QPixmap(pa->fileName);
        pa->size = pa->pixmap.size();
    }
    int a = area(pa->size);
    if (pb->size == QSize() && pb->pixmap.isNull()) {
        pb->pixmap = QPixmap(pb->fileName);
        pb->size = pb->pixmap.size();
    }
    int b = area(pb->size);
    int res = a;
    if (qMin(a,b) >= s)
        res = qMin(a,b);
    else
        res = qMax(a,b);
    if (res == a)
        return pa;
    return pb;
}

QPixmapIconEngineEntry *QPixmapIconEngine::tryMatch(const QSize &size, QIcon::Mode mode, QIcon::State state)
{
    QPixmapIconEngineEntry *pe = 0;
    for (int i = 0; i < pixmaps.count(); ++i)
        if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) {
            if (pe)
                pe = bestSizeMatch(size, &pixmaps[i], pe);
            else
                pe = &pixmaps[i];
        }
    return pe;
}


QPixmapIconEngineEntry *QPixmapIconEngine::bestMatch(const QSize &size, QIcon::Mode mode, QIcon::State state, bool sizeOnly)
{
    QPixmapIconEngineEntry *pe = tryMatch(size, mode, state);
    while (!pe){
        QIcon::State oppositeState = (state == QIcon::On) ? QIcon::Off : QIcon::On;
        if (mode == QIcon::Disabled || mode == QIcon::Selected) {
            QIcon::Mode oppositeMode = (mode == QIcon::Disabled) ? QIcon::Selected : QIcon::Disabled;
            if ((pe = tryMatch(size, QIcon::Normal, state)))
                break;
            if ((pe = tryMatch(size, QIcon::Active, state)))
                break;
            if ((pe = tryMatch(size, mode, oppositeState)))
                break;
            if ((pe = tryMatch(size, QIcon::Normal, oppositeState)))
                break;
            if ((pe = tryMatch(size, QIcon::Active, oppositeState)))
                break;
            if ((pe = tryMatch(size, oppositeMode, state)))
                break;
            if ((pe = tryMatch(size, oppositeMode, oppositeState)))
                break;
        } else {
            QIcon::Mode oppositeMode = (mode == QIcon::Normal) ? QIcon::Active : QIcon::Normal;
            if ((pe = tryMatch(size, oppositeMode, state)))
                break;
            if ((pe = tryMatch(size, mode, oppositeState)))
                break;
            if ((pe = tryMatch(size, oppositeMode, oppositeState)))
                break;
            if ((pe = tryMatch(size, QIcon::Disabled, state)))
                break;
            if ((pe = tryMatch(size, QIcon::Selected, state)))
                break;
            if ((pe = tryMatch(size, QIcon::Disabled, oppositeState)))
                break;
            if ((pe = tryMatch(size, QIcon::Selected, oppositeState)))
                break;
        }

        if (!pe)
            return pe;
    }

    if (sizeOnly ? (pe->size.isNull() || !pe->size.isValid()) : pe->pixmap.isNull()) {
        pe->pixmap = QPixmap(pe->fileName);
        if (!pe->pixmap.isNull())
            pe->size = pe->pixmap.size();
    }

    return pe;
}

QPixmap QPixmapIconEngine::pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state)
{
    QPixmap pm;
    QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, false);
    if (pe)
        pm = pe->pixmap;

    if (pm.isNull()) {
        int idx = pixmaps.count();
        while (--idx >= 0) {
            if (pe == &pixmaps[idx]) {
                pixmaps.remove(idx);
                break;
            }
        }
        if (pixmaps.isEmpty())
            return pm;
        else
            return pixmap(size, mode, state);
    }

    QSize actualSize = pm.size();
    if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height()))
        actualSize.scale(size, Qt::KeepAspectRatio);

    QString key = QLatin1Literal("qt_")
                  % HexString<quint64>(pm.cacheKey())
                  % HexString<uint>(pe->mode)
                  % HexString<quint64>(QApplication::palette().cacheKey())
                  % HexString<uint>(actualSize.width())
                  % HexString<uint>(actualSize.height());

    if (mode == QIcon::Active) {
        if (QPixmapCache::find(key % HexString<uint>(mode), pm))
            return pm; // horray
        if (QPixmapCache::find(key % HexString<uint>(QIcon::Normal), pm)) {
            QStyleOption opt(0);
            opt.palette = QApplication::palette();
            QPixmap active = QApplication::style()->generatedIconPixmap(QIcon::Active, pm, &opt);
            if (pm.cacheKey() == active.cacheKey())
                return pm;
        }
    }

    if (!QPixmapCache::find(key % HexString<uint>(mode), pm)) {
        if (pm.size() != actualSize)
            pm = pm.scaled(actualSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
        if (pe->mode != mode && mode != QIcon::Normal) {
            QStyleOption opt(0);
            opt.palette = QApplication::palette();
            QPixmap generated = QApplication::style()->generatedIconPixmap(mode, pm, &opt);
            if (!generated.isNull())
                pm = generated;
        }
        QPixmapCache::insert(key % HexString<uint>(mode), pm);
    }
    return pm;
}

QSize QPixmapIconEngine::actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state)
{
    QSize actualSize;
    if (QPixmapIconEngineEntry *pe = bestMatch(size, mode, state, true))
        actualSize = pe->size;

    if (actualSize.isNull())
        return actualSize;

    if (!actualSize.isNull() && (actualSize.width() > size.width() || actualSize.height() > size.height()))
        actualSize.scale(size, Qt::KeepAspectRatio);
    return actualSize;
}

void QPixmapIconEngine::addPixmap(const QPixmap &pixmap, QIcon::Mode mode, QIcon::State state)
{
    if (!pixmap.isNull()) {
        QPixmapIconEngineEntry *pe = tryMatch(pixmap.size(), mode, state);
        if(pe && pe->size == pixmap.size()) {
            pe->pixmap = pixmap;
            pe->fileName.clear();
        } else {
            pixmaps += QPixmapIconEngineEntry(pixmap, mode, state);
        }
    }
}

void QPixmapIconEngine::addFile(const QString &fileName, const QSize &_size, QIcon::Mode mode, QIcon::State state)
{
    if (!fileName.isEmpty()) {
        QSize size = _size;
        QPixmap pixmap;

        QString abs = fileName;
        if (fileName.at(0) != QLatin1Char(':'))
            abs = QFileInfo(fileName).absoluteFilePath();

        for (int i = 0; i < pixmaps.count(); ++i) {
            if (pixmaps.at(i).mode == mode && pixmaps.at(i).state == state) {
                QPixmapIconEngineEntry *pe = &pixmaps[i];
                if(size == QSize()) {
                    pixmap = QPixmap(abs);
                    size = pixmap.size();
                }
                if (pe->size == QSize() && pe->pixmap.isNull()) {
                    pe->pixmap = QPixmap(pe->fileName);
                    pe->size = pe->pixmap.size();
                }
                if(pe->size == size) {
                    pe->pixmap = pixmap;
                    pe->fileName = abs;
                    return;
                }
            }
        }
        QPixmapIconEngineEntry e(abs, size, mode, state);
        e.pixmap = pixmap;
        pixmaps += e;
    }
}

QString QPixmapIconEngine::key() const
{
    return QLatin1String("QPixmapIconEngine");
}

QIconEngineV2 *QPixmapIconEngine::clone() const
{
    return new QPixmapIconEngine(*this);
}

bool QPixmapIconEngine::read(QDataStream &in)
{
    int num_entries;
    QPixmap pm;
    QString fileName;
    QSize sz;
    uint mode;
    uint state;

    in >> num_entries;
    for (int i=0; i < num_entries; ++i) {
        if (in.atEnd()) {
            pixmaps.clear();
            return false;
        }
        in >> pm;
        in >> fileName;
        in >> sz;
        in >> mode;
        in >> state;
        if (pm.isNull()) {
            addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
        } else {
            QPixmapIconEngineEntry pe(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
            pe.pixmap = pm;
            pixmaps += pe;
        }
    }
    return true;
}

bool QPixmapIconEngine::write(QDataStream &out) const
{
    int num_entries = pixmaps.size();
    out << num_entries;
    for (int i=0; i < num_entries; ++i) {
        if (pixmaps.at(i).pixmap.isNull())
            out << QPixmap(pixmaps.at(i).fileName);
        else
            out << pixmaps.at(i).pixmap;
        out << pixmaps.at(i).fileName;
        out << pixmaps.at(i).size;
        out << (uint) pixmaps.at(i).mode;
        out << (uint) pixmaps.at(i).state;
    }
    return true;
}

void QPixmapIconEngine::virtual_hook(int id, void *data)
{
    switch (id) {
    case QIconEngineV2::AvailableSizesHook: {
        QIconEngineV2::AvailableSizesArgument &arg =
            *reinterpret_cast<QIconEngineV2::AvailableSizesArgument*>(data);
        arg.sizes.clear();
        for (int i = 0; i < pixmaps.size(); ++i) {
            QPixmapIconEngineEntry &pe = pixmaps[i];
            if (pe.size == QSize() && pe.pixmap.isNull()) {
                pe.pixmap = QPixmap(pe.fileName);
                pe.size = pe.pixmap.size();
            }
            if (pe.mode == arg.mode && pe.state == arg.state && !pe.size.isEmpty())
                arg.sizes.push_back(pe.size);
        }
        break;
    }
    default:
        QIconEngineV2::virtual_hook(id, data);
    }
}

#ifndef QT_NO_LIBRARY
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QIconEngineFactoryInterface_iid, QLatin1String("/iconengines"), Qt::CaseInsensitive))
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loaderV2,
    (QIconEngineFactoryInterfaceV2_iid, QLatin1String("/iconengines"), Qt::CaseInsensitive))
#endif



QIcon::QIcon()
    : d(0)
{
}

QIcon::QIcon(const QPixmap &pixmap)
    :d(0)
{
    addPixmap(pixmap);
}

QIcon::QIcon(const QIcon &other)
    :d(other.d)
{
    if (d)
        d->ref.ref();
}

QIcon::QIcon(const QString &fileName)
    : d(0)
{
    addFile(fileName);
}


QIcon::QIcon(QIconEngine *engine)
    :d(new QIconPrivate)
{
    d->engine_version = 1;
    d->engine = engine;
    d->v1RefCount = new QAtomicInt(1);
}

QIcon::QIcon(QIconEngineV2 *engine)
    :d(new QIconPrivate)
{
    d->engine_version = 2;
    d->engine = engine;
}

QIcon::~QIcon()
{
    if (d && !d->ref.deref())
        delete d;
}

QIcon &QIcon::operator=(const QIcon &other)
{
    if (other.d)
        other.d->ref.ref();
    if (d && !d->ref.deref())
        delete d;
    d = other.d;
    return *this;
}

QIcon::operator QVariant() const
{
    return QVariant(QVariant::Icon, this);
}

int QIcon::serialNumber() const
{
    return d ? d->serialNum : 0;
}

qint64 QIcon::cacheKey() const
{
    if (!d)
        return 0;
    return (((qint64) d->serialNum) << 32) | ((qint64) (d->detach_no));
}

QPixmap QIcon::pixmap(const QSize &size, Mode mode, State state) const
{
    if (!d)
        return QPixmap();
    return d->engine->pixmap(size, mode, state);
}

QSize QIcon::actualSize(const QSize &size, Mode mode, State state) const
{
    if (!d)
        return QSize();
    return d->engine->actualSize(size, mode, state);
}


void QIcon::paint(QPainter *painter, const QRect &rect, Qt::Alignment alignment, Mode mode, State state) const
{
    if (!d || !painter)
        return;
    QRect alignedRect = QStyle::alignedRect(painter->layoutDirection(), alignment, d->engine->actualSize(rect.size(), mode, state), rect);
    d->engine->paint(painter, alignedRect, mode, state);
}

bool QIcon::isNull() const
{
    return !d;
}

bool QIcon::isDetached() const
{
    return !d || d->ref == 1;
}

void QIcon::detach()
{
    if (d) {
        if (d->ref != 1) {
            QIconPrivate *x = new QIconPrivate;
            if (d->engine_version > 1) {
                QIconEngineV2 *engine = static_cast<QIconEngineV2 *>(d->engine);
                x->engine = engine->clone();
            } else {
                x->engine = d->engine;
                x->v1RefCount = d->v1RefCount;
                x->v1RefCount->ref();
            }
            x->engine_version = d->engine_version;
            if (!d->ref.deref())
                delete d;
            d = x;
        }
        ++d->detach_no;
    }
}

void QIcon::addPixmap(const QPixmap &pixmap, Mode mode, State state)
{
    if (pixmap.isNull())
        return;
    if (!d) {
        d = new QIconPrivate;
        d->engine = new QPixmapIconEngine;
    } else {
        detach();
    }
    d->engine->addPixmap(pixmap, mode, state);
}


void QIcon::addFile(const QString &fileName, const QSize &size, Mode mode, State state)
{
    if (fileName.isEmpty())
        return;
    if (!d) {
#if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
        QFileInfo info(fileName);
        QString suffix = info.suffix();
        if (!suffix.isEmpty()) {
            // first try version 2 engines..
            if (QIconEngineFactoryInterfaceV2 *factory = qobject_cast<QIconEngineFactoryInterfaceV2*>(loaderV2()->instance(suffix))) {
                if (QIconEngine *engine = factory->create(fileName)) {
                    d = new QIconPrivate;
                    d->engine = engine;
                }
            }
            // ..then fall back and try to load version 1 engines
            if (!d) {
                if (QIconEngineFactoryInterface *factory = qobject_cast<QIconEngineFactoryInterface*>(loader()->instance(suffix))) {
                    if (QIconEngine *engine = factory->create(fileName)) {
                        d = new QIconPrivate;
                        d->engine = engine;
                        d->engine_version = 1;
                        d->v1RefCount = new QAtomicInt(1);
                    }
                }
            }
        }
#endif
        // ...then fall back to the default engine
        if (!d) {
            d = new QIconPrivate;
            d->engine = new QPixmapIconEngine;
        }
    } else {
        detach();
    }
    d->engine->addFile(fileName, size, mode, state);
}

QList<QSize> QIcon::availableSizes(Mode mode, State state) const
{
    if (!d || !d->engine || d->engine_version < 2)
        return QList<QSize>();
    QIconEngineV2 *engine = static_cast<QIconEngineV2*>(d->engine);
    return engine->availableSizes(mode, state);
}

QString QIcon::name() const
{
    if (!d || !d->engine || d->engine_version < 2)
        return QString();
    QIconEngineV2 *engine = static_cast<QIconEngineV2*>(d->engine);
    return engine->iconName();
}

void QIcon::setThemeSearchPaths(const QStringList &paths)
{
    QIconLoader::instance()->setThemeSearchPath(paths);
}

QStringList QIcon::themeSearchPaths()
{
    return QIconLoader::instance()->themeSearchPaths();
}

void QIcon::setThemeName(const QString &name)
{
    QIconLoader::instance()->setThemeName(name);
}

QString QIcon::themeName()
{
    return QIconLoader::instance()->themeName();
}

QIcon QIcon::fromTheme(const QString &name, const QIcon &fallback)
{
    QIcon icon;

    if (qtIconCache()->contains(name)) {
        icon = *qtIconCache()->object(name);
    } else {
        QIcon *cachedIcon  = new QIcon(new QIconLoaderEngine(name));
        qtIconCache()->insert(name, cachedIcon);
        icon = *cachedIcon;
    }

    // Note the qapp check is to allow lazy loading of static icons
    // Supporting fallbacks will not work for this case.
    if (qApp && icon.availableSizes().isEmpty())
        return fallback;

    return icon;
}

bool QIcon::hasThemeIcon(const QString &name)
{
    QIcon icon = fromTheme(name);

    return !icon.isNull();
}


/*****************************************************************************
  QIcon stream functions
 *****************************************************************************/
#if !defined(QT_NO_DATASTREAM)

QDataStream &operator<<(QDataStream &s, const QIcon &icon)
{
    if (s.version() >= QDataStream::Qt_4_3) {
        if (icon.isNull()) {
            s << QString();
        } else {
            if (icon.d->engine_version > 1) {
                QIconEngineV2 *engine = static_cast<QIconEngineV2 *>(icon.d->engine);
                s << engine->key();
                engine->write(s);
            } else {
                // not really supported
                qWarning("QIcon: Cannot stream QIconEngine. Use QIconEngineV2 instead.");
            }
        }
    } else if (s.version() == QDataStream::Qt_4_2) {
        if (icon.isNull()) {
            s << 0;
        } else {
            QPixmapIconEngine *engine = static_cast<QPixmapIconEngine *>(icon.d->engine);
            int num_entries = engine->pixmaps.size();
            s << num_entries;
            for (int i=0; i < num_entries; ++i) {
                s << engine->pixmaps.at(i).pixmap;
                s << engine->pixmaps.at(i).fileName;
                s << engine->pixmaps.at(i).size;
                s << (uint) engine->pixmaps.at(i).mode;
                s << (uint) engine->pixmaps.at(i).state;
            }
        }
    } else {
        s << QPixmap(icon.pixmap(22,22));
    }
    return s;
}

QDataStream &operator>>(QDataStream &s, QIcon &icon)
{
    if (s.version() >= QDataStream::Qt_4_3) {
        icon = QIcon();
        QString key;
        s >> key;
        if (key == QLatin1String("QPixmapIconEngine")) {
            icon.d = new QIconPrivate;
            QIconEngineV2 *engine = new QPixmapIconEngine;
            icon.d->engine = engine;
            engine->read(s);
        } else if (key == QLatin1String("QIconLoaderEngine")) {
            icon.d = new QIconPrivate;
            QIconEngineV2 *engine = new QIconLoaderEngine();
            icon.d->engine = engine;
            engine->read(s);
#if !defined (QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS)
        } else if (QIconEngineFactoryInterfaceV2 *factory = qobject_cast<QIconEngineFactoryInterfaceV2*>(loaderV2()->instance(key))) {
            if (QIconEngineV2 *engine= factory->create()) {
                icon.d = new QIconPrivate;
                icon.d->engine = engine;
                engine->read(s);
            }
#endif
        }
    } else if (s.version() == QDataStream::Qt_4_2) {
        icon = QIcon();
        int num_entries;
        QPixmap pm;
        QString fileName;
        QSize sz;
        uint mode;
        uint state;

        s >> num_entries;
        for (int i=0; i < num_entries; ++i) {
            s >> pm;
            s >> fileName;
            s >> sz;
            s >> mode;
            s >> state;
            if (pm.isNull())
                icon.addFile(fileName, sz, QIcon::Mode(mode), QIcon::State(state));
            else
                icon.addPixmap(pm, QIcon::Mode(mode), QIcon::State(state));
        }
    } else {
        QPixmap pm;
        s >> pm;
        icon.addPixmap(pm);
    }
    return s;
}

#endif //QT_NO_DATASTREAM


#ifdef QT3_SUPPORT

static int widths[2] = { 22, 32 };
static int heights[2] = { 22, 32 };

static QSize pixmapSizeHelper(QIcon::Size which)
{
    int i = 0;
    if (which == QIcon::Large)
        i = 1;
    return QSize(widths[i], heights[i]);
}

QPixmap QIcon::pixmap(Size size, Mode mode, State state) const
{ return pixmap(pixmapSizeHelper(size), mode, state); }

QPixmap QIcon::pixmap(Size size, bool enabled, State state) const
{ return pixmap(pixmapSizeHelper(size), enabled ? Normal : Disabled, state); }

QPixmap QIcon::pixmap() const
{ return pixmap(pixmapSizeHelper(Small), Normal, Off); }

void QIcon::setPixmapSize(Size which, const QSize &size)
{
    int i = 0;
    if (which == Large)
        i = 1;
    widths[i] = size.width();
    heights[i] = size.height();
}

QSize QIcon::pixmapSize(Size which)
{
    return pixmapSizeHelper(which);
}

#endif // QT3_SUPPORT

QT_END_NAMESPACE
#endif //QT_NO_ICON