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****************************************************************************/

#include <qglobal.h>

#ifndef QT_NO_PRINTER

#include <qdebug.h>

#include "private/qpaintengine_alpha_p.h"

#include "private/qpicture_p.h"

#include "QtGui/qpicture.h"

QT_BEGIN_NAMESPACE

QAlphaPaintEngine::QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps)

    : QPaintEngine(data, devcaps)

{

}

QAlphaPaintEngine::~QAlphaPaintEngine()

{

}

bool QAlphaPaintEngine::begin(QPaintDevice *pdev)

{

    Q_D(QAlphaPaintEngine);

    d->m_continueCall = true;

    if (d->m_pass != 0) {

        return true;

    }

    d->m_savedcaps = gccaps;

    d->m_pdev = pdev;

    d->m_alphaPen = false;

    d->m_alphaBrush = false;

    d->m_alphaOpacity = false;

    d->m_hasalpha = false;

    d->m_advancedPen = false;

    d->m_advancedBrush = false;

    d->m_complexTransform = false;

    d->m_emulateProjectiveTransforms = false;

    // clear alpha region

    d->m_alphargn = QRegion();

    d->m_cliprgn = QRegion();

    d->m_pen = QPen();

    d->m_transform = QTransform();

    flushAndInit();

    return true;

}

bool QAlphaPaintEngine::end()

{

    Q_D(QAlphaPaintEngine);

    d->m_continueCall = true;

    if (d->m_pass != 0) {

        return true;

    }

    flushAndInit(false);

    return true;

}

void QAlphaPaintEngine::updateState(const QPaintEngineState &state)

{

    Q_D(QAlphaPaintEngine);

    DirtyFlags flags = state.state();

    if (flags & QPaintEngine::DirtyTransform) {

        d->m_transform = state.transform();

        d->m_complexTransform = (d->m_transform.type() > QTransform::TxScale);

        d->m_emulateProjectiveTransforms = !(d->m_savedcaps & QPaintEngine::PerspectiveTransform)

                                           && !(d->m_savedcaps & QPaintEngine::AlphaBlend)

                                           && (d->m_transform.type() >= QTransform::TxProject);

    }

    if (flags & QPaintEngine::DirtyPen) {

        d->m_pen = state.pen();

        if (d->m_pen.style() == Qt::NoPen) {

            d->m_advancedPen = false;

            d->m_alphaPen = false;

        } else {

            d->m_advancedPen = (d->m_pen.brush().style() != Qt::SolidPattern);

            d->m_alphaPen = !d->m_pen.brush().isOpaque();

        }

    }

    if (d->m_pass != 0) {

        d->m_continueCall = true;

        return;

    }

    d->m_continueCall = false;

    if (flags & QPaintEngine::DirtyOpacity) {

        d->m_alphaOpacity = (state.opacity() != 1.0f);

    }

    if (flags & QPaintEngine::DirtyBrush) {

        if (state.brush().style() == Qt::NoBrush) {

            d->m_advancedBrush = false;

            d->m_alphaBrush = false;

        } else {

            d->m_advancedBrush = (state.brush().style() != Qt::SolidPattern);

            d->m_alphaBrush = !state.brush().isOpaque();

        }

    }

    d->m_hasalpha = d->m_alphaOpacity || d->m_alphaBrush || d->m_alphaPen;

    if (d->m_picengine)

        d->m_picengine->updateState(state);

}

void QAlphaPaintEngine::drawPath(const QPainterPath &path)

{

    Q_D(QAlphaPaintEngine);

    QRectF tr = d->addPenWidth(path);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (d->m_hasalpha || d->m_advancedPen || d->m_advancedBrush

            || d->m_emulateProjectiveTransforms)

        {

            d->addAlphaRect(tr);

        }

        if (d->m_picengine)

            d->m_picengine->drawPath(path);

    } else {

        d->m_continueCall = !d->fullyContained(tr);

    }

}

void QAlphaPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)

{

    Q_D(QAlphaPaintEngine);

    QPolygonF poly;

    for (int i=0; i<pointCount; ++i)

        poly.append(points[i]);

    QPainterPath path;

    path.addPolygon(poly);

    QRectF tr = d->addPenWidth(path);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (d->m_hasalpha || d->m_advancedPen || d->m_advancedBrush

            || d->m_emulateProjectiveTransforms)

        {

            d->addAlphaRect(tr);

        }

        if (d->m_picengine)

            d->m_picengine->drawPolygon(points, pointCount, mode);

    } else {

        d->m_continueCall = !d->fullyContained(tr);

    }

}

void QAlphaPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)

{

    Q_D(QAlphaPaintEngine);

    QRectF tr = d->m_transform.mapRect(r);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (pm.hasAlpha() || d->m_alphaOpacity || d->m_complexTransform || pm.isQBitmap()) {

            d->addAlphaRect(tr);

        }

        if (d->m_picengine)

            d->m_picengine->drawPixmap(r, pm, sr);

    } else {

        d->m_continueCall = !d->fullyContained(tr);

    }

}

void QAlphaPaintEngine::drawImage(const QRectF &r, const QImage &image, const QRectF &sr)

{

    Q_D(QAlphaPaintEngine);

    QRectF tr = d->m_transform.mapRect(r);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (image.hasAlphaChannel() || d->m_alphaOpacity || d->m_complexTransform) {

            d->addAlphaRect(tr);

        }

        if (d->m_picengine)

            d->m_picengine->drawImage(r, image, sr);

    } else {

        d->m_continueCall = !d->fullyContained(tr);

    }

}

void QAlphaPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)

{

    Q_D(QAlphaPaintEngine);

    QRectF tr(p.x(), p.y() - textItem.ascent(), textItem.width() + 5, textItem.ascent() + textItem.descent() + 5);

    tr = d->m_transform.mapRect(tr);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (d->m_alphaPen || d->m_alphaOpacity || d->m_advancedPen) {

            d->addAlphaRect(tr);

        }

        if (d->m_picengine) {

            d->m_picengine->drawTextItem(p, textItem);

        }

    } else {

        d->m_continueCall = !d->fullyContained(tr);

    }

}

void QAlphaPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s)

{

    Q_D(QAlphaPaintEngine);

    QRectF brect = d->m_transform.mapRect(r);

    if (d->m_pass == 0) {

        d->m_continueCall = false;

        if (pixmap.hasAlpha() || d->m_alphaOpacity || d->m_complexTransform || pixmap.isQBitmap()) {

            d->addAlphaRect(brect);

        }

        if (d->m_picengine)

            d->m_picengine->drawTiledPixmap(r, pixmap, s);

    } else {

        d->m_continueCall = !d->fullyContained(brect);

    }

}

QRegion QAlphaPaintEngine::alphaClipping() const

{

    Q_D(const QAlphaPaintEngine);

    return d->m_cliprgn;

}

bool QAlphaPaintEngine::continueCall() const

{

    Q_D(const QAlphaPaintEngine);

    return d->m_continueCall;

}

void QAlphaPaintEngine::flushAndInit(bool init)

{

    Q_D(QAlphaPaintEngine);

    Q_ASSERT(d->m_pass == 0);

    if (d->m_pic) {

        d->m_picpainter->end();

        // set clip region

        d->m_alphargn = d->m_alphargn.intersected(QRect(0, 0, d->m_pdev->width(), d->m_pdev->height()));

        // just use the bounding rect if it's a complex region..

        QVector<QRect> rects = d->m_alphargn.rects();

        if (rects.size() > 10) {

            QRect br = d->m_alphargn.boundingRect();

            d->m_alphargn = QRegion(br);

            rects.clear();

            rects.append(br);

        }

        d->m_cliprgn = d->m_alphargn;

        // now replay the QPicture

        ++d->m_pass; // we are now doing pass #2

        // reset states

        gccaps = d->m_savedcaps;

        painter()->save();

        d->resetState(painter());

        // make sure the output from QPicture is unscaled

        QTransform mtx;

        mtx.scale(1.0f / (qreal(d->m_pdev->logicalDpiX()) / qreal(qt_defaultDpiX())),

                  1.0f / (qreal(d->m_pdev->logicalDpiY()) / qreal(qt_defaultDpiY())));

        painter()->setTransform(mtx);

        painter()->drawPicture(0, 0, *d->m_pic);

        d->m_cliprgn = QRegion();

        d->resetState(painter());

        // fill in the alpha images

        for (int i=0; i<rects.size(); ++i)

            d->drawAlphaImage(rects.at(i));

        d->m_alphargn = QRegion();

        painter()->restore();

        --d->m_pass; // pass #2 finished

        cleanUp();

    }

    if (init) {

        gccaps = PaintEngineFeatures(AllFeatures & ~QPaintEngine::ObjectBoundingModeGradients);

        d->m_pic = new QPicture();

        d->m_pic->d_ptr->in_memory_only = true;

        d->m_picpainter = new QPainter(d->m_pic);

        d->m_picengine = d->m_picpainter->paintEngine();

        // When newPage() is called and the m_picpainter is recreated

        // we have to copy the current state of the original printer

        // painter back to the m_picpainter

        d->m_picpainter->setPen(painter()->pen());

        d->m_picpainter->setBrush(painter()->brush());

        d->m_picpainter->setBrushOrigin(painter()->brushOrigin());

        d->m_picpainter->setFont(painter()->font());

        d->m_picpainter->setOpacity(painter()->opacity());

        d->m_picpainter->setTransform(painter()->combinedTransform());

        d->m_picengine->syncState();

    }

}

void QAlphaPaintEngine::cleanUp()

{

    Q_D(QAlphaPaintEngine);

    delete d->m_picpainter;

    delete d->m_pic;

    d->m_picpainter = 0;

    d->m_pic = 0;

    d->m_picengine = 0;

}

QAlphaPaintEnginePrivate::QAlphaPaintEnginePrivate()

    :   m_pass(0),

        m_pic(0),

        m_picengine(0),

        m_picpainter(0),

        m_hasalpha(false),

        m_alphaPen(false),

        m_alphaBrush(false),

        m_alphaOpacity(false),

        m_advancedPen(false),

        m_advancedBrush(false),

        m_complexTransform(false)

{

}

QAlphaPaintEnginePrivate::~QAlphaPaintEnginePrivate()

{

    delete m_picpainter;

    delete m_pic;

}

QRectF QAlphaPaintEnginePrivate::addPenWidth(const QPainterPath &path)

{

    QPainterPath tmp = path;

    if (m_pen.style() == Qt::NoPen)

        return (path.controlPointRect() * m_transform).boundingRect();

    if (m_pen.isCosmetic())

        tmp = path * m_transform;

    QPainterPathStroker stroker;

    if (m_pen.widthF() == 0.0f)

        stroker.setWidth(1.0);

    else

        stroker.setWidth(m_pen.widthF());

    stroker.setJoinStyle(m_pen.joinStyle());

    stroker.setCapStyle(m_pen.capStyle());

    tmp = stroker.createStroke(tmp);

    if (m_pen.isCosmetic())

        return tmp.controlPointRect();

    return (tmp.controlPointRect() * m_transform).boundingRect();

}

QRect QAlphaPaintEnginePrivate::toRect(const QRectF &rect) const

{

    QRect r;

    r.setLeft(int(rect.left()));

    r.setTop(int(rect.top()));

    r.setRight(int(rect.right() + 1));

    r.setBottom(int(rect.bottom() + 1));

    return r;

}

void QAlphaPaintEnginePrivate::addAlphaRect(const QRectF &rect)

{

    m_alphargn |= toRect(rect);

}

void QAlphaPaintEnginePrivate::drawAlphaImage(const QRectF &rect)

{

    Q_Q(QAlphaPaintEngine);

    qreal dpiX = qMax(m_pdev->logicalDpiX(), 300);

    qreal dpiY = qMax(m_pdev->logicalDpiY(), 300);

    qreal xscale = (dpiX / m_pdev->logicalDpiX());

    qreal yscale = (dpiY / m_pdev->logicalDpiY());

    QTransform picscale;

    picscale.scale(xscale, yscale);

    const int tileSize = 2048;

    QSize size((int(rect.width() * xscale)), int(rect.height() * yscale));

    int divw = (size.width() / tileSize);

    int divh = (size.height() / tileSize);

    divw += 1;

    divh += 1;

    int incx = int(rect.width() / divw);

    int incy = int(rect.height() / divh);

    for (int y=0; y<divh; ++y) {

        int ypos = int((incy * y) + rect.y());

        int height = int((y == (divh - 1)) ? (rect.height() - (incy * y)) : incy) + 1;

        for (int x=0; x<divw; ++x) {

            int xpos = int((incx * x) + rect.x());

            int width = int((x == (divw - 1)) ? (rect.width() - (incx * x)) : incx) + 1;

            QSize imgsize((int)(width * xscale), (int)(height * yscale));

            QImage img(imgsize, QImage::Format_RGB32);

            img.fill(0xffffffff);

            QPainter imgpainter(&img);

            imgpainter.setTransform(picscale);

            QPointF picpos(qreal(-xpos), qreal(-ypos));

            imgpainter.drawPicture(picpos, *m_pic);

            imgpainter.end();

            q->painter()->setTransform(QTransform());

            QRect r(xpos, ypos, width, height);

            q->painter()->drawImage(r, img);

        }

    }

}

bool QAlphaPaintEnginePrivate::fullyContained(const QRectF &rect) const

{

    QRegion r(toRect(rect));

    return (m_cliprgn.intersected(r) == r);

}

void QAlphaPaintEnginePrivate::resetState(QPainter *p)

{

    p->setPen(QPen());

    p->setBrush(QBrush());

    p->setBrushOrigin(0,0);

    p->setBackground(QBrush());

    p->setFont(QFont());

    p->setTransform(QTransform());

    // The view transform is already recorded and included in the

    // picture we're about to replay. If we don't turn if off,

    // the view matrix will be applied twice.

    p->setViewTransformEnabled(false);

    p->setClipRegion(QRegion(), Qt::NoClip);

    p->setClipPath(QPainterPath(), Qt::NoClip);

    p->setClipping(false);

    p->setOpacity(1.0f);

}

QT_END_NAMESPACE

#endif // QT_NO_PRINTER