qpicture.cpp File Reference

#include "qpicture.h"
#include <private/qpicture_p.h>
#include <private/qfactoryloader_p.h>
#include <private/qpaintengine_pic_p.h>
#include <private/qfont_p.h>
#include "qdatastream.h"
#include "qfile.h"
#include "qimage.h"
#include "qmutex.h"
#include "qpainter.h"
#include "qpainterpath.h"
#include "qpixmap.h"
#include "qregion.h"
#include "qdebug.h"
#include "qregexp.h"
#include "qapplication.h"
#include "qpictureformatplugin.h"

Go to the source code of this file.

Classes
class	QFakeDevice
class	QPictureHandler
struct	QPictureIOData

Typedefs
typedef QList< QPictureHandler * >	QPHList

Functions
static void	cleanup ()
static QPictureHandler *	get_picture_handler (const char *format)
	Q_GLOBAL_STATIC_WITH_ARGS (QFactoryLoader, factoryLoader,(QPictureFormatInterface_iid, QLatin1String("/pictureformats"))) void qt_init_picture_plugins()
void	qt_format_text (const QFont &fnt, const QRectF &_r, int tf, const QTextOption *opt, const QString &str, QRectF *brect, int tabstops, int *, int tabarraylen, QPainter *painter)
void	qt_init_picture_handlers ()
static QStringList	qToStringList (const QList< QByteArray > arr)

Variables
static const quint16	mfhdr_maj = 11
static const quint16	mfhdr_min = 0
const char *	qt_mfhdr_tag = "QPIC"

Typedef Documentation

QPHList

typedef QList<QPictureHandler *> QPHList

Definition at line 1487 of file qpicture.cpp.

Function Documentation

cleanup()

static void cleanup ( )

static

Definition at line 1508 of file qpicture.cpp.

Referenced by QProcessPrivate::_q_processDied(), QProcessPrivate::_q_startupNotification(), QVectorPath::addCacheData(), QIcdEngine::changedSessionConfiguration(), QDeclarativeBindingCompilerPrivate::compile(), QProcessPrivate::createChannel(), IapMonitor::IapMonitor(), QMacInputContext::identifierName(), QTestAccessibility::initialize(), QTabBarPrivate::moveTabFinished(), QDeclarativeObjectMethodScriptClass::property(), QGLPixelBufferPrivate::QGLPixelBufferPrivate(), qt_init_picture_handlers(), QDeclarativeBindingCompilerPrivate::releaseReg(), QScopedPointer< QXmlResultItemsPrivate >::reset(), QDeclarativeCompiledBindingsPrivate::run(), QVGPixmapData::size(), QProcessPrivate::startProcess(), utcToLocal(), QDeclarativeEnginePrivate::~QDeclarativeEnginePrivate(), QIBaseResultPrivate::~QIBaseResultPrivate(), QScopedPointer< QXmlResultItemsPrivate >::~QScopedPointer(), QWindowsXPStylePrivate::~QWindowsXPStylePrivate(), and QTest::TestFuncCleanup::~TestFuncCleanup().

{
    // make sure that picture handlers are delete before plugin manager
    if (QPHList *list = pictureHandlers()) {
        qDeleteAll(*list);
        list->clear();
    }
}

get_picture_handler()

static QPictureHandler* get_picture_handler ( const char *  format )

static

Definition at line 1525 of file qpicture.cpp.

Referenced by QPictureIO::read(), and QPictureIO::write().

{                                                // get pointer to handler
    qt_init_picture_handlers();
    qt_init_picture_plugins();
    if (QPHList *list = pictureHandlers()) {
        for (int i = 0; i < list->size(); ++i) {
            if (list->at(i)->format == format)
                return list->at(i);
        }
    }
    return 0;                                        // no such handler
}

Q_GLOBAL_STATIC_WITH_ARGS()

Q_GLOBAL_STATIC_WITH_ARGS	(	QFactoryLoader	,
		factoryLoader	,
		(QPictureFormatInterface_iid, QLatin1String("/pictureformats"))
	)

Definition at line 1492 of file qpicture.cpp.

{
#ifndef QT_NO_LIBRARY
    QMutexLocker locker(mutex());
    QFactoryLoader *loader = factoryLoader();
    QStringList keys = loader->keys();
    for (int i = 0; i < keys.count(); ++i)
        if (QPictureFormatInterface *format = qobject_cast<QPictureFormatInterface*>(loader->instance(keys.at(i))))
            format->installIOHandler(keys.at(i));
#endif
}

qt_format_text()

void qt_format_text	(	const QFont &	fnt,
		const QRectF &	_r,
		int	tf,
		const QTextOption *	opt,
		const QString &	str,
		QRectF *	brect,
		int	tabstops,
		int *	ta,
		int	tabarraylen,
		QPainter *	painter
	)

Definition at line 8458 of file qpainter.cpp.

Referenced by QPicture::exec().

{

    Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=0) ); // we either have an option or flags

    if (option) {
        tf |= option->alignment();
        if (option->wrapMode() != QTextOption::NoWrap)
            tf |= Qt::TextWordWrap;

        if (option->flags() & QTextOption::IncludeTrailingSpaces)
            tf |= Qt::TextIncludeTrailingSpaces;

        if (option->tabStop() >= 0 || !option->tabArray().isEmpty())
            tf |= Qt::TextExpandTabs;
    }

    // we need to copy r here to protect against the case (&r == brect).
    QRectF r(_r);

    bool dontclip  = (tf & Qt::TextDontClip);
    bool wordwrap  = (tf & Qt::TextWordWrap) || (tf & Qt::TextWrapAnywhere);
    bool singleline = (tf & Qt::TextSingleLine);
    bool showmnemonic = (tf & Qt::TextShowMnemonic);
    bool hidemnmemonic = (tf & Qt::TextHideMnemonic);

    Qt::LayoutDirection layout_direction;
    if (tf & Qt::TextForceLeftToRight)
        layout_direction = Qt::LeftToRight;
    else if (tf & Qt::TextForceRightToLeft)
        layout_direction = Qt::RightToLeft;
    else if (option)
        layout_direction = option->textDirection();
    else if (painter)
        layout_direction = painter->layoutDirection();
    else
        layout_direction = Qt::LeftToRight;

    tf = QStyle::visualAlignment(layout_direction, QFlag(tf));

    bool isRightToLeft = layout_direction == Qt::RightToLeft;
    bool expandtabs = ((tf & Qt::TextExpandTabs) &&
                        (((tf & Qt::AlignLeft) && !isRightToLeft) ||
                          ((tf & Qt::AlignRight) && isRightToLeft)));

    if (!painter)
        tf |= Qt::TextDontPrint;

    uint maxUnderlines = 0;
    int numUnderlines = 0;
    QVarLengthArray<int, 32> underlinePositions(1);

    QFontMetricsF fm(fnt);
    QString text = str;
    int offset = 0;
start_lengthVariant:
    bool hasMoreLengthVariants = false;
    // compatible behaviour to the old implementation. Replace
    // tabs by spaces
    int old_offset = offset;
    for (; offset < text.length(); offset++) {
        QChar chr = text.at(offset);
        if (chr == QLatin1Char('\r') || (singleline && chr == QLatin1Char('\n'))) {
            text[offset] = QLatin1Char(' ');
        } else if (chr == QLatin1Char('\n')) {
            text[offset] = QChar::LineSeparator;
        } else if (chr == QLatin1Char('&')) {
            ++maxUnderlines;
        } else if (chr == QLatin1Char('\t')) {
            if (!expandtabs) {
                text[offset] = QLatin1Char(' ');
            } else if (!tabarraylen && !tabstops) {
                tabstops = qRound(fm.width(QLatin1Char('x'))*8);
            }
        } else if (chr == QChar(ushort(0x9c))) {
            // string with multiple length variants
            hasMoreLengthVariants = true;
            break;
        }
    }

    int length = offset - old_offset;
    if ((hidemnmemonic || showmnemonic) && maxUnderlines > 0) {
        underlinePositions.resize(maxUnderlines + 1);

        QChar *cout = text.data() + old_offset;
        QChar *cin = cout;
        int l = length;
        while (l) {
            if (*cin == QLatin1Char('&')) {
                ++cin;
                --length;
                --l;
                if (!l)
                    break;
                if (*cin != QLatin1Char('&') && !hidemnmemonic)
                    underlinePositions[numUnderlines++] = cout - text.data() - old_offset;
            }
            *cout = *cin;
            ++cout;
            ++cin;
            --l;
        }
    }

    // no need to do extra work for underlines if we don't paint
    if (tf & Qt::TextDontPrint)
        numUnderlines = 0;

    underlinePositions[numUnderlines] = -1;
    qreal height = 0;
    qreal width = 0;

    QString finalText = text.mid(old_offset, length);
    QStackTextEngine engine(finalText, fnt);
    if (option) {
        engine.option = *option;
    }

    if (engine.option.tabStop() < 0 && tabstops > 0)
        engine.option.setTabStop(tabstops);

    if (engine.option.tabs().isEmpty() && ta) {
        QList<qreal> tabs;
        for (int i = 0; i < tabarraylen; i++)
            tabs.append(qreal(ta[i]));
        engine.option.setTabArray(tabs);
    }

    engine.option.setTextDirection(layout_direction);
    if (tf & Qt::AlignJustify)
        engine.option.setAlignment(Qt::AlignJustify);
    else
        engine.option.setAlignment(Qt::AlignLeft); // do not do alignment twice

    if (!option && (tf & Qt::TextWrapAnywhere))
        engine.option.setWrapMode(QTextOption::WrapAnywhere);

    if (tf & Qt::TextJustificationForced)
        engine.forceJustification = true;
    QTextLayout textLayout(&engine);
    textLayout.setCacheEnabled(true);
    textLayout.engine()->underlinePositions = underlinePositions.data();

    if (finalText.isEmpty()) {
        height = fm.height();
        width = 0;
        tf |= Qt::TextDontPrint;
    } else {
        qreal lineWidth = 0x01000000;
        if (wordwrap || (tf & Qt::TextJustificationForced))
            lineWidth = qMax<qreal>(0, r.width());
        if(!wordwrap)
            tf |= Qt::TextIncludeTrailingSpaces;
        textLayout.engine()->ignoreBidi = bool(tf & Qt::TextDontPrint);
        textLayout.beginLayout();

        qreal leading = fm.leading();
        height = -leading;

        while (1) {
            QTextLine l = textLayout.createLine();
            if (!l.isValid())
                break;

            l.setLineWidth(lineWidth);
            height += leading;
            l.setPosition(QPointF(0., height));
            height += l.height();
            width = qMax(width, l.naturalTextWidth());
            if (!dontclip && !brect && height >= r.height())
                break;
        }
        textLayout.endLayout();
    }

    qreal yoff = 0;
    qreal xoff = 0;
    if (tf & Qt::AlignBottom) {
        yoff = r.height() - height;
    } else if (tf & Qt::AlignVCenter) {
        yoff = (r.height() - height)/2;
        if (painter) {
            QTransform::TransformationType type = painter->transform().type();
            if (type <= QTransform::TxScale) {
                // do the rounding manually to work around inconsistencies
                // in the paint engines when drawing on floating point offsets
                const qreal scale = painter->transform().m22();
                if (scale != 0)
                    yoff = -qRound(-yoff * scale) / scale;
            }
        }
    }
    if (tf & Qt::AlignRight) {
        xoff = r.width() - width;
    } else if (tf & Qt::AlignHCenter) {
        xoff = (r.width() - width)/2;
        if (painter) {
            QTransform::TransformationType type = painter->transform().type();
            if (type <= QTransform::TxScale) {
                // do the rounding manually to work around inconsistencies
                // in the paint engines when drawing on floating point offsets
                const qreal scale = painter->transform().m11();
                if (scale != 0)
                    xoff = qRound(xoff * scale) / scale;
            }
        }
    }
    QRectF bounds = QRectF(r.x() + xoff, r.y() + yoff, width, height);

    if (hasMoreLengthVariants && !(tf & Qt::TextLongestVariant) && !r.contains(bounds)) {
        offset++;
        goto start_lengthVariant;
    }
    if (brect)
        *brect = bounds;

    if (!(tf & Qt::TextDontPrint)) {
        bool restore = false;
        if (!dontclip && !r.contains(bounds)) {
            restore = true;
            painter->save();
            painter->setClipRect(r, Qt::IntersectClip);
        }

        for (int i = 0; i < textLayout.lineCount(); i++) {
            QTextLine line = textLayout.lineAt(i);

            qreal advance = line.horizontalAdvance();
            xoff = 0;
            if (tf & Qt::AlignRight) {
                QTextEngine *eng = textLayout.engine();
                xoff = r.width() - advance -
                    eng->leadingSpaceWidth(eng->lines[line.lineNumber()]).toReal();
            }
            else if (tf & Qt::AlignHCenter)
                xoff = (r.width() - advance) / 2;

            line.draw(painter, QPointF(r.x() + xoff, r.y() + yoff));
        }

        if (restore) {
            painter->restore();
        }
    }
}

qt_init_picture_handlers()

void qt_init_picture_handlers

(

)

Definition at line 1517 of file qpicture.cpp.

Referenced by QPictureIO::defineIOHandler(), get_picture_handler(), QPictureIO::inputFormats(), QPictureIO::outputFormats(), and QPictureIO::pictureFormat().

{
    static QBasicAtomicInt done = Q_BASIC_ATOMIC_INITIALIZER(0);
    if (done.testAndSetRelaxed(0, 1)) {
        qAddPostRoutine(cleanup);
    }
}

qToStringList()

static QStringList qToStringList ( const QList< QByteArray >  arr )

static

Definition at line 1291 of file qpicture.cpp.

Referenced by QPicture::inputFormatList(), and QPicture::outputFormatList().

{
    QStringList list;
    for (int i = 0; i < arr.count(); ++i)
        list.append(QString::fromLatin1(arr.at(i)));
    return list;
}

Variable Documentation

mfhdr_maj

const quint16 mfhdr_maj = 11

static

Definition at line 113 of file qpicture.cpp.

Referenced by QPicturePrivate::checkFormat(), QPicture::QPicture(), and QPicturePrivate::resetFormat().

mfhdr_min

const quint16 mfhdr_min = 0

static

Definition at line 114 of file qpicture.cpp.

Referenced by QPicturePrivate::resetFormat().

qt_mfhdr_tag

const char* qt_mfhdr_tag = "QPIC"

Definition at line 112 of file qpicture.cpp.

Referenced by QPicturePaintEngine::begin(), and QPicturePrivate::checkFormat().