diff -r 000000000000 -r 1918ee327afb src/gui/painting/qpaintengine_alpha.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/painting/qpaintengine_alpha.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,518 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** 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
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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;
+}
+
+extern int qt_defaultDpiX();
+extern int qt_defaultDpiY();
+
+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