qpaintengine_pic.cpp

奇趣公司比较新的qt/emd版本

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#include "private/qpaintengine_p.h"
#include "private/qpainter_p.h"
#include "private/qpicture_p.h"
#include "private/qfont_p.h"

#ifndef QT_NO_PICTURE

#include "qbuffer.h"
#include "qbytearray.h"
#include "qdatastream.h"
#include "qpaintengine_pic_p.h"
#include "qpicture.h"
#include "qpolygon.h"
#include "qrect.h"
#include <private/qtextengine_p.h>

//#define QT_PICTURE_DEBUG
#include <qdebug.h>

#include <private/qmath_p.h>

class QPicturePaintEnginePrivate : public QPaintEnginePrivate
{
    Q_DECLARE_PUBLIC(QPicturePaintEngine)
public:
    QDataStream s;
    QPainter *pt;
    QPicturePrivate *pic_d;
};

QPicturePaintEngine::QPicturePaintEngine()
    : QPaintEngine(*(new QPicturePaintEnginePrivate), AllFeatures)
{
    Q_D(QPicturePaintEngine);
    d->pt = 0;
}

QPicturePaintEngine::QPicturePaintEngine(QPaintEnginePrivate &dptr)
    : QPaintEngine(dptr, AllFeatures)
{
    Q_D(QPicturePaintEngine);
    d->pt = 0;
}

QPicturePaintEngine::~QPicturePaintEngine()
{
}

bool QPicturePaintEngine::begin(QPaintDevice *pd)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << "QPicturePaintEngine::begin()";
#endif
    Q_ASSERT(pd);
    QPicture *pic = static_cast<QPicture *>(pd);

    d->pdev = pd;
    d->pic_d = pic->d_func();
    Q_ASSERT(d->pic_d);

    d->s.setDevice(&d->pic_d->pictb);
    d->s.setVersion(d->pic_d->formatMajor);

    d->pic_d->pictb.open(QIODevice::WriteOnly | QIODevice::Truncate);
    d->s.writeRawData(qt_mfhdr_tag, 4);
    d->s << (quint16) 0 << (quint16) d->pic_d->formatMajor << (quint16) d->pic_d->formatMinor;
    d->s << (quint8) QPicturePrivate::PdcBegin << (quint8) sizeof(qint32);
    d->pic_d->brect = QRect();
    if (d->pic_d->formatMajor >= 4) {
        QRect r = pic->boundingRect();
        d->s << (qint32) r.left() << (qint32) r.top() << (qint32) r.width()
             << (qint32) r.height();
    }
    d->pic_d->trecs = 0;
    d->s << (quint32)d->pic_d->trecs; // total number of records
    d->pic_d->formatOk = false;
    setActive(true);
    return true;
}

bool QPicturePaintEngine::end()
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << "QPicturePaintEngine::end()";
#endif
    d->pic_d->trecs++;
    d->s << (quint8) QPicturePrivate::PdcEnd << (quint8) 0;
    int cs_start = sizeof(quint32);                // pos of checksum word
    int data_start = cs_start + sizeof(quint16);
    int brect_start = data_start + 2*sizeof(qint16) + 2*sizeof(quint8);
    int pos = d->pic_d->pictb.pos();
    d->pic_d->pictb.seek(brect_start);
    if (d->pic_d->formatMajor >= 4) { // bounding rectangle
        QRect r = static_cast<QPicture *>(d->pdev)->boundingRect();
        d->s << (qint32) r.left() << (qint32) r.top() << (qint32) r.width()
             << (qint32) r.height();
    }
    d->s << (quint32) d->pic_d->trecs;                        // write number of records
    d->pic_d->pictb.seek(cs_start);
    QByteArray buf = d->pic_d->pictb.buffer();
    quint16 cs = (quint16) qChecksum(buf.constData() + data_start, pos - data_start);
    d->s << cs;                                // write checksum
    d->pic_d->pictb.close();
    setActive(false);
    return true;
}

#define SERIALIZE_CMD(c) \
    d->pic_d->trecs++; \
    d->s << (quint8) c; \
    d->s << (quint8) 0; \
    pos = d->pic_d->pictb.pos()

void QPicturePaintEngine::updatePen(const QPen &pen)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updatePen(): width:" << pen.width() << "style:"
             << pen.style() << "color:" << pen.color();
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetPen);
    d->s << pen;
    writeCmdLength(pos, QRect(), false);
}

void QPicturePaintEngine::updateCompositionMode(QPainter::CompositionMode cmode)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateCompositionMode():" << cmode;
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetCompositionMode);
    d->s << (qint32)cmode;
    writeCmdLength(pos, QRectF(), false);
}

void QPicturePaintEngine::updateClipEnabled(bool enabled)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateClipEnabled():" << enabled;
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetClipEnabled);
    d->s << enabled;
    writeCmdLength(pos, QRectF(), false);
}

void QPicturePaintEngine::updateOpacity(qreal opacity)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateOpacity():" << opacity;
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetOpacity);
    d->s << double(opacity);
    writeCmdLength(pos, QRectF(), false);
}

void QPicturePaintEngine::updateBrush(const QBrush &brush)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateBrush(): style:" << brush.style();
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetBrush);
    d->s << brush;
    writeCmdLength(pos, QRect(), false);
}

void QPicturePaintEngine::updateBrushOrigin(const QPointF &p)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateBrushOrigin(): " << p;
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetBrushOrigin);
    d->s << p;
    writeCmdLength(pos, QRect(), false);
}

void QPicturePaintEngine::updateFont(const QFont &font)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateFont(): pt sz:" << font.pointSize();
#endif
    int pos;
    SERIALIZE_CMD(QPicturePrivate::PdcSetFont);
    QFont fnt = font;
    d->s << fnt;
    writeCmdLength(pos, QRectF(), false);
}

void QPicturePaintEngine::updateBackground(Qt::BGMode bgMode, const QBrush &bgBrush)
{
    Q_D(QPicturePaintEngine);
#ifdef QT_PICTURE_DEBUG
    qDebug() << " -> updateBackground(): mode:" << bgMode << "style:" << bgBrush.style();
#endif
    int pos;