qpaintbuffer.cpp File Reference

#include <qmath.h>
#include <private/qpainterpath_p.h>
#include <private/qpaintbuffer_p.h>
#include <private/qfontengine_p.h>
#include <private/qemulationpaintengine_p.h>
#include <private/qimage_p.h>
#include <qstatictext.h>
#include <private/qstatictext_p.h>
#include <private/qrawfont_p.h>
#include <QDebug>

Go to the source code of this file.

Classes
class	QFakeDevice
struct	QPaintBufferCacheEntry
struct	QPaintBufferCacheEntryV2
struct	QPaintBufferCacheEntryV2::Flags
class	QPaintBufferEnginePrivate

Functions
QDataStream &	operator<< (QDataStream &stream, const QPaintBufferCommand &command)
QDataStream &	operator<< (QDataStream &stream, const QPaintBufferCacheEntry &entry)
QDataStream &	operator<< (QDataStream &stream, const QPaintBufferCacheEntryV2 &entry)
QDataStream &	operator<< (QDataStream &stream, const QPaintBuffer &buffer)
QDataStream &	operator>> (QDataStream &stream, QPaintBufferCommand &command)
QDataStream &	operator>> (QDataStream &stream, QPaintBufferCacheEntry &entry)
QDataStream &	operator>> (QDataStream &stream, QPaintBufferCacheEntryV2 &entry)
QDataStream &	operator>> (QDataStream &stream, QPaintBuffer &buffer)
static QImage	qpaintbuffer_storable_image (const QImage &src)
static int	qRegisterPaintBufferMetaTypes ()
void	qt_format_text (const QFont &font, const QRectF &_r, int tf, const QTextOption *option, const QString &str, QRectF *brect, int tabstops, int *tabarray, int tabarraylen, QPainter *painter)

Function Documentation

operator<<() [1/4]

QDataStream& operator<<	(	QDataStream &	stream,
		const QPaintBufferCommand &	command
	)

Definition at line 2100 of file qpaintbuffer.cpp.

{
    quint32 id = command.id;
    quint32 size = command.size;
    stream << id << size;
    stream << command.offset << command.offset2 << command.extra;
    return stream;
}

operator<<() [2/4]

QDataStream& operator<<	(	QDataStream &	stream,
		const QPaintBufferCacheEntry &	entry
	)

Definition at line 2149 of file qpaintbuffer.cpp.

{
    return stream << entry.type << entry.cacheKey;
}

operator<<() [3/4]

QDataStream& operator<<	(	QDataStream &	stream,
		const QPaintBufferCacheEntryV2 &	entry
	)

Definition at line 2159 of file qpaintbuffer.cpp.

{
    return stream << entry.bits;
}

operator<<() [4/4]

QDataStream& operator<<	(	QDataStream &	stream,
		const QPaintBuffer &	buffer
	)

Definition at line 2181 of file qpaintbuffer.cpp.

{
    QHash<qint64, uint> pixmapKeys;
    QHash<qint64, uint> imageKeys;

    QHash<qint64, QPixmap> pixmaps;
    QHash<qint64, QImage> images;

    QVector<QVariant> variants = buffer.d_ptr->variants;
    for (int i = 0; i < variants.size(); ++i) {
        const QVariant &v = variants.at(i);
        if (v.type() == QVariant::Image) {
            const QImage image(v.value<QImage>());

            QPaintBufferCacheEntryV2 entry;
            entry.flags.type = QPaintBufferCacheEntryV2::ImageKey;

            QHash<qint64, uint>::iterator it = imageKeys.find(image.cacheKey());
            if (it != imageKeys.end()) {
                entry.flags.key = *it;
            } else {
                imageKeys[image.cacheKey()] = entry.flags.key = images.size();
                images[images.size()] = image;
            }

            variants[i] = QVariant::fromValue(entry);
        } else if (v.type() == QVariant::Pixmap) {
            const QPixmap pixmap(v.value<QPixmap>());

            QPaintBufferCacheEntryV2 entry;
            entry.flags.type = QPaintBufferCacheEntryV2::PixmapKey;

            QHash<qint64, uint>::iterator it = pixmapKeys.find(pixmap.cacheKey());
            if (it != pixmapKeys.end()) {
                entry.flags.key = *it;
            } else {
                pixmapKeys[pixmap.cacheKey()] = entry.flags.key = pixmaps.size();
                pixmaps[pixmaps.size()] = pixmap;
            }

            variants[i] = QVariant::fromValue(entry);
        }
    }

    stream << pixmaps;
    stream << images;

    stream << buffer.d_ptr->ints;
    stream << buffer.d_ptr->floats;
    stream << variants;
    stream << buffer.d_ptr->commands;
    stream << buffer.d_ptr->boundingRect;
    stream << buffer.d_ptr->frames;

    return stream;
}

operator>>() [1/4]

QDataStream& operator>>	(	QDataStream &	stream,
		QPaintBufferCommand &	command
	)

Definition at line 2109 of file qpaintbuffer.cpp.

{
    quint32 id;
    quint32 size;
    stream >> id >> size;
    stream >> command.offset >> command.offset2 >> command.extra;
    command.id = id;
    command.size = size;
    return stream;
}

operator>>() [2/4]

QDataStream& operator>>	(	QDataStream &	stream,
		QPaintBufferCacheEntry &	entry
	)

Definition at line 2154 of file qpaintbuffer.cpp.

{
    return stream >> entry.type >> entry.cacheKey;
}

operator>>() [3/4]

QDataStream& operator>>	(	QDataStream &	stream,
		QPaintBufferCacheEntryV2 &	entry
	)

Definition at line 2164 of file qpaintbuffer.cpp.

{
    return stream >> entry.bits;
}

operator>>() [4/4]

QDataStream& operator>>	(	QDataStream &	stream,
		QPaintBuffer &	buffer
	)

Definition at line 2238 of file qpaintbuffer.cpp.

{
    QHash<qint64, QPixmap> pixmaps;
    QHash<qint64, QImage> images;

    stream >> pixmaps;
    stream >> images;

    stream >> buffer.d_ptr->ints;
    stream >> buffer.d_ptr->floats;
    stream >> buffer.d_ptr->variants;
    stream >> buffer.d_ptr->commands;
    stream >> buffer.d_ptr->boundingRect;
    stream >> buffer.d_ptr->frames;

    QVector<QVariant> &variants = buffer.d_ptr->variants;
    for (int i = 0; i < variants.size(); ++i) {
        const QVariant &v = variants.at(i);
        if (v.canConvert<QPaintBufferCacheEntry>()) {
            QPaintBufferCacheEntry entry = v.value<QPaintBufferCacheEntry>();
            if (entry.type == QVariant::Image)
                variants[i] = QVariant(images.value(entry.cacheKey));
            else
                variants[i] = QVariant(pixmaps.value(entry.cacheKey));
        } else if (v.canConvert<QPaintBufferCacheEntryV2>()) {
            QPaintBufferCacheEntryV2 entry = v.value<QPaintBufferCacheEntryV2>();

            if (entry.flags.type == QPaintBufferCacheEntryV2::ImageKey)
                variants[i] = QVariant(images.value(entry.flags.key));
            else if (entry.flags.type == QPaintBufferCacheEntryV2::PixmapKey)
                variants[i] = QVariant(pixmaps.value(entry.flags.key));
            else
                qWarning() << "operator<<(QDataStream &stream, QPaintBuffer &buffer): unrecognized cache entry type:" << entry.flags.type;
        }
    }

    return stream;
}

qpaintbuffer_storable_image()

static QImage qpaintbuffer_storable_image ( const QImage &  src )

inlinestatic

Definition at line 1212 of file qpaintbuffer.cpp.

Referenced by QPaintBufferEngine::drawImage().

{
    QImageData *d = const_cast<QImage &>(src).data_ptr();
    return d->own_data ? src : src.copy();
}

qRegisterPaintBufferMetaTypes()

static int qRegisterPaintBufferMetaTypes ( )

static

Definition at line 2169 of file qpaintbuffer.cpp.

{
    qRegisterMetaType<QPaintBufferCacheEntry>();
    qRegisterMetaTypeStreamOperators<QPaintBufferCacheEntry>("QPaintBufferCacheEntry");
    qRegisterMetaType<QPaintBufferCacheEntryV2>();
    qRegisterMetaTypeStreamOperators<QPaintBufferCacheEntryV2>("QPaintBufferCacheEntryV2");

    return 0; // something
}

qt_format_text()

void qt_format_text	(	const QFont &	font,
		const QRectF &	_r,
		int	tf,
		const QTextOption *	option,
		const QString &	str,
		QRectF *	brect,
		int	tabstops,
		int *	tabarray,
		int	tabarraylen,
		QPainter *	painter
	)

Definition at line 8458 of file qpainter.cpp.

Referenced by QPainter::boundingRect(), QPainter::drawText(), QPainterReplayer::process(), and qt_format_text().

{

    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();
        }
    }
}