qpaintengine_raster.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QtCore/qglobal.h>
#include <QtCore/qmutex.h>
 
#define QT_FT_BEGIN_HEADER
#define QT_FT_END_HEADER
 
#include <private/qrasterdefs_p.h>
#include <private/qgrayraster_p.h>
 
#include <qpainterpath.h>
#include <qdebug.h>
#include <qbitmap.h>
#include "qmath_p.h"
#include <qrandom.h>
 
//   #include <private/qdatabuffer_p.h>
//   #include <private/qpainter_p.h>
#include <private/qtextengine_p.h>
#include <private/qfontengine_p.h>
#include <private/qpixmap_raster_p.h>
//   #include <private/qrasterizer_p.h>
#include <private/qimage_p.h>
#include <private/qstatictext_p.h>
#include <private/qcosmeticstroker_p.h>
#include <private/qdrawhelper_p.h>
#include <private/qmemrotate_p.h>
#include <private/qpixellayout_p.h>
#include <private/qrgba64_p.h>
 
#include "qpaintengine_raster_p.h"
//   #include "qbezier_p.h"
#include "qoutlinemapper_p.h"
 
#include <limits.h>
#include <algorithm>
 
#ifdef Q_OS_WIN
#  include <qvarlengtharray.h>
#  include <private/qfontengine_p.h>
#  include <qt_windows.h>
#ifdef Q_OS_WIN64
#    include <malloc.h>
#  endif
#endif
 
QT_BEGIN_NAMESPACE
 
class QRectVectorPath : public QVectorPath {
public:
    inline void set(const QRect &r) {
        qreal left = r.x();
        qreal right = r.x() + r.width();
        qreal top = r.y();
        qreal bottom = r.y() + r.height();
        pts[0] = left;
        pts[1] = top;
        pts[2] = right;
        pts[3] = top;
        pts[4] = right;
        pts[5] = bottom;
        pts[6] = left;
        pts[7] = bottom;
    }
 
    inline void set(const QRectF &r) {
        qreal left = r.x();
        qreal right = r.x() + r.width();
        qreal top = r.y();
        qreal bottom = r.y() + r.height();
        pts[0] = left;
        pts[1] = top;
        pts[2] = right;
        pts[3] = top;
        pts[4] = right;
        pts[5] = bottom;
        pts[6] = left;
        pts[7] = bottom;
    }
    inline QRectVectorPath(const QRect &r)
        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    {
        set(r);
    }
    inline QRectVectorPath(const QRectF &r)
        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    {
        set(r);
    }
    inline QRectVectorPath()
        : QVectorPath(pts, 4, nullptr, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    { }
 
    qreal pts[8];
};
 
Q_GUI_EXPORT extern bool qt_scaleForTransform(const QTransform &transform, qreal *scale); // qtransform.cpp
 
#define qt_swap_int(x, y) { int tmp = (x); (x) = (y); (y) = tmp; }
#define qt_swap_qreal(x, y) { qreal tmp = (x); (x) = (y); (y) = tmp; }
 
// #define QT_DEBUG_DRAW
#ifdef QT_DEBUG_DRAW
void dumpClip(int width, int height, const QClipData *clip);
#endif
 
#define QT_FAST_SPANS
 
 
// A little helper macro to get a better approximation of dimensions.
// If we have a rect that starting at 0.5 of width 3.5 it should span
// 4 pixels.
#define int_dim(pos, dim) (int(pos+dim) - int(pos))
 
#ifdef Q_OS_WIN
 
static inline bool winClearTypeFontsEnabled()
{
    UINT result = 0;
#if !defined(SPI_GETFONTSMOOTHINGTYPE) // MinGW
#    define SPI_GETFONTSMOOTHINGTYPE  0x200A
#    define FE_FONTSMOOTHINGCLEARTYPE 0x002
#endif
    SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &result, 0);
    return result == FE_FONTSMOOTHINGCLEARTYPE;
}
 
/*!
    \internal
 */
bool QRasterPaintEngine::clearTypeFontsEnabled()
{
    static const bool result = winClearTypeFontsEnabled();
    return result;
}
 
#endif // Q_OS_WIN
 
 
 
/********************************************************************************
 * Span functions
 */
static void qt_span_fill_clipRect(int count, const QT_FT_Span *spans, void *userData);
static void qt_span_fill_clipped(int count, const QT_FT_Span *spans, void *userData);
static void qt_span_clip(int count, const QT_FT_Span *spans, void *userData);
 
struct ClipData
{
    QClipData *oldClip;
    QClipData *newClip;
    Qt::ClipOperation operation;
};
 
enum LineDrawMode {
    LineDrawClipped,
    LineDrawNormal,
    LineDrawIncludeLastPixel
};
 
static void drawEllipse_midpoint_i(const QRect &rect, const QRect &clip,
                                   ProcessSpans pen_func, ProcessSpans brush_func,
                                   QSpanData *pen_data, QSpanData *brush_data);
 
struct QRasterFloatPoint {
    qreal x;
    qreal y;
};
 
#ifdef QT_DEBUG_DRAW
static const QRectF boundingRect(const QPointF *points, int pointCount)
{
    const QPointF *e = points;
    const QPointF *last = points + pointCount;
    qreal minx, maxx, miny, maxy;
    minx = maxx = e->x();
    miny = maxy = e->y();
    while (++e < last) {
        if (e->x() < minx)
            minx = e->x();
        else if (e->x() > maxx)
            maxx = e->x();
        if (e->y() < miny)
            miny = e->y();
        else if (e->y() > maxy)
            maxy = e->y();
    }
    return QRectF(QPointF(minx, miny), QPointF(maxx, maxy));
}
#endif
 
static void qt_ft_outline_move_to(qfixed x, qfixed y, void *data)
{
    ((QOutlineMapper *) data)->moveTo(QPointF(qt_fixed_to_real(x), qt_fixed_to_real(y)));
}
 
static void qt_ft_outline_line_to(qfixed x, qfixed y, void *data)
{
    ((QOutlineMapper *) data)->lineTo(QPointF(qt_fixed_to_real(x), qt_fixed_to_real(y)));
}
 
static void qt_ft_outline_cubic_to(qfixed c1x, qfixed c1y,
                             qfixed c2x, qfixed c2y,
                             qfixed ex, qfixed ey,
                             void *data)
{
    ((QOutlineMapper *) data)->curveTo(QPointF(qt_fixed_to_real(c1x), qt_fixed_to_real(c1y)),
                                       QPointF(qt_fixed_to_real(c2x), qt_fixed_to_real(c2y)),
                                       QPointF(qt_fixed_to_real(ex), qt_fixed_to_real(ey)));
}
 
 
#if !defined(QT_NO_DEBUG) && 0
static void qt_debug_path(const QPainterPath &path)
{
    const char *names[] = {
        "MoveTo     ",
        "LineTo     ",
        "CurveTo    ",
        "CurveToData"
    };
 
    fprintf(stderr,"\nQPainterPath: elementCount=%d\n", path.elementCount());
    for (int i=0; i<path.elementCount(); ++i) {
        const QPainterPath::Element &e = path.elementAt(i);
        Q_ASSERT(e.type >= 0 && e.type <= QPainterPath::CurveToDataElement);
        fprintf(stderr," - %3d:: %s, (%.2f, %.2f)\n", i, names[e.type], e.x, e.y);
    }
}
#endif
 
QRasterPaintEnginePrivate::QRasterPaintEnginePrivate() :
    QPaintEngineExPrivate(),
    cachedLines(0)
{
}
 
 
/*!
    \class QRasterPaintEngine
    \internal
    \inmodule QtGui
    \since 4.2
 
    \brief The QRasterPaintEngine class enables hardware acceleration
    of painting operations in Qt for Embedded Linux.
 
    Note that this functionality is only available in
    Qt for Embedded Linux.
 
    In Qt for Embedded Linux, painting is a pure software
    implementation. But starting with Qt 4.2, it is
    possible to add an accelerated graphics driver to take advantage
    of available hardware resources.
 
    Hardware acceleration is accomplished by creating a custom screen
    driver, accelerating the copying from memory to the screen, and
    implementing a custom paint engine accelerating the various
    painting operations. Then a custom paint device and a custom
    window surface must be implemented to make
    Qt for Embedded Linux aware of the accelerated driver.
 
    \note The QRasterPaintEngine class does not support 8-bit images.
    Instead, they need to be converted to a supported format, such as
    QImage::Format_ARGB32_Premultiplied.
 
    \sa QPaintEngine
*/
 
/*
    \fn QPaintEngine::Type QRasterPaintEngine::type() const
    \reimp
*/
 
/*!
    \since 4.5
 
    Creates a raster based paint engine for operating on the given
    \a device, with the complete set of \l
    {QPaintEngine::PaintEngineFeature}{paint engine features and
    capabilities}.
*/
QRasterPaintEngine::QRasterPaintEngine(QPaintDevice *device)
    : QPaintEngineEx(*(new QRasterPaintEnginePrivate))
{
    d_func()->device = device;
    init();
}
 
/*!
    \internal
*/
QRasterPaintEngine::QRasterPaintEngine(QRasterPaintEnginePrivate &dd, QPaintDevice *device)
    : QPaintEngineEx(dd)
{
    d_func()->device = device;
    init();
}
 
void QRasterPaintEngine::init()
{
    Q_D(QRasterPaintEngine);
 
 
#ifdef Q_OS_WIN
    d->hdc = 0;
#endif
 
    // The antialiasing raster.
    d->grayRaster.reset(new QT_FT_Raster);
    Q_CHECK_PTR(d->grayRaster.data());
    if (QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_new(d->grayRaster.data()))
        QT_THROW(std::bad_alloc()); // an error creating the raster is caused by a bad malloc
 
 
    d->rasterizer.reset(new QRasterizer);
    d->rasterBuffer.reset(new QRasterBuffer());
    d->outlineMapper.reset(new QOutlineMapper);
    d->outlinemapper_xform_dirty = true;
 
    d->basicStroker.setMoveToHook(qt_ft_outline_move_to);
    d->basicStroker.setLineToHook(qt_ft_outline_line_to);
    d->basicStroker.setCubicToHook(qt_ft_outline_cubic_to);
 
    d->baseClip.reset(new QClipData(d->device->height()));
    d->baseClip->setClipRect(QRect(0, 0, d->device->width(), d->device->height()));
 
    d->image_filler.init(d->rasterBuffer.data(), this);
    d->image_filler.type = QSpanData::Texture;
 
    d->image_filler_xform.init(d->rasterBuffer.data(), this);
    d->image_filler_xform.type = QSpanData::Texture;
 
    d->solid_color_filler.init(d->rasterBuffer.data(), this);
    d->solid_color_filler.type = QSpanData::Solid;
 
    d->deviceDepth = d->device->depth();
 
    d->mono_surface = false;
    gccaps &= ~PorterDuff;
 
    QImage::Format format = QImage::Format_Invalid;
 
    switch (d->device->devType()) {
    case QInternal::Pixmap:
        qWarning("QRasterPaintEngine: unsupported for pixmaps...");
        break;
    case QInternal::Image:
        format = d->rasterBuffer->prepare(static_cast<QImage *>(d->device));
        break;
    default:
        qWarning("QRasterPaintEngine: unsupported target device %d\n", d->device->devType());
        d->device = nullptr;
        return;
    }
 
    switch (format) {
    case QImage::Format_MonoLSB:
    case QImage::Format_Mono:
        d->mono_surface = true;
        break;
    default:
        if (QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha)
            gccaps |= PorterDuff;
        break;
    }
}
 
 
/*!
    Destroys this paint engine.
*/
QRasterPaintEngine::~QRasterPaintEngine()
{
    Q_D(QRasterPaintEngine);
 
    QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_done(*d->grayRaster.data());
}
 
/*!
    \reimp
*/
bool QRasterPaintEngine::begin(QPaintDevice *device)
{
    Q_D(QRasterPaintEngine);
 
    if (device->devType() == QInternal::Pixmap) {
        QPixmap *pixmap = static_cast<QPixmap *>(device);
        QPlatformPixmap *pd = pixmap->handle();
        if (pd->classId() == QPlatformPixmap::RasterClass || pd->classId() == QPlatformPixmap::BlitterClass)
            d->device = pd->buffer();
    } else {
        d->device = device;
    }
 
    // Make sure QPaintEngine::paintDevice() returns the proper device.
    d->pdev = d->device;
 
    Q_ASSERT(d->device->devType() == QInternal::Image
             || d->device->devType() == QInternal::CustomRaster);
 
    d->systemStateChanged();
 
    QRasterPaintEngineState *s = state();
    ensureOutlineMapper();
    d->outlineMapper->setClipRect(d->deviceRect);
    d->rasterizer->setClipRect(d->deviceRect);
 
    s->penData.init(d->rasterBuffer.data(), this);
    s->penData.setup(s->pen.brush(), s->intOpacity, s->composition_mode, s->flags.cosmetic_brush);
    s->stroker = &d->basicStroker;
    d->basicStroker.setClipRect(d->deviceRect);
 
    s->brushData.init(d->rasterBuffer.data(), this);
    s->brushData.setup(s->brush, s->intOpacity, s->composition_mode, s->flags.cosmetic_brush);
 
    d->rasterBuffer->compositionMode = QPainter::CompositionMode_SourceOver;
 
    setDirty(DirtyBrushOrigin);
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::begin(" << (void *) device
             << ") devType:" << device->devType()
             << "devRect:" << d->deviceRect;
    if (d->baseClip) {
        dumpClip(d->rasterBuffer->width(), d->rasterBuffer->height(), &*d->baseClip);
    }
#endif
 
    if (d->mono_surface)
        d->glyphCacheFormat = QFontEngine::Format_Mono;
#if defined(Q_OS_WIN)
    else if (clearTypeFontsEnabled())
#else
    else if (false)
#endif
    {
        QImage::Format format = static_cast<QImage *>(d->device)->format();
        if (format == QImage::Format_ARGB32_Premultiplied || format == QImage::Format_RGB32)
            d->glyphCacheFormat = QFontEngine::Format_A32;
        else
            d->glyphCacheFormat = QFontEngine::Format_A8;
    } else
        d->glyphCacheFormat = QFontEngine::Format_A8;
 
    setActive(true);
    return true;
}
 
/*!
    \reimp
*/
bool QRasterPaintEngine::end()
{
#ifdef QT_DEBUG_DRAW
    Q_D(QRasterPaintEngine);
    qDebug() << "QRasterPaintEngine::end devRect:" << d->deviceRect;
    if (d->baseClip) {
        dumpClip(d->rasterBuffer->width(), d->rasterBuffer->height(), &*d->baseClip);
    }
#endif
 
    return true;
}
 
/*!
    \internal
*/
void QRasterPaintEngine::updateMatrix(const QTransform &matrix)
{
    QRasterPaintEngineState *s = state();
    // FALCON: get rid of this line, see drawImage call below.
    s->matrix = matrix;
    s->flags.tx_noshear = qt_scaleForTransform(s->matrix, &s->txscale);
 
    ensureOutlineMapper();
}
 
 
 
QRasterPaintEngineState::~QRasterPaintEngineState()
{
    if (flags.has_clip_ownership)
        delete clip;
}
 
 
QRasterPaintEngineState::QRasterPaintEngineState()
{
    stroker = nullptr;
 
    fillFlags = 0;
    strokeFlags = 0;
    pixmapFlags = 0;
 
    intOpacity = 256;
 
    txscale = 1.;
 
    flag_bits = 0;
    flags.fast_pen = true;
    flags.non_complex_pen = false;
    flags.antialiased = false;
    flags.bilinear = false;
    flags.fast_text = true;
    flags.tx_noshear = true;
    flags.fast_images = true;
    flags.cosmetic_brush = true;
 
    clip = nullptr;
    flags.has_clip_ownership = false;
 
    dirty = 0;
}
 
QRasterPaintEngineState::QRasterPaintEngineState(const QRasterPaintEngineState &s)
    : QPainterState(s)
    , lastPen(s.lastPen)
    , penData(s.penData)
    , stroker(s.stroker)
    , strokeFlags(s.strokeFlags)
    , lastBrush(s.lastBrush)
    , brushData(s.brushData)
    , fillFlags(s.fillFlags)
    , pixmapFlags(s.pixmapFlags)
    , intOpacity(s.intOpacity)
    , txscale(s.txscale)
    , clip(s.clip)
    , dirty(s.dirty)
    , flag_bits(s.flag_bits)
{
    brushData.tempImage = nullptr;
    penData.tempImage = nullptr;
    flags.has_clip_ownership = false;
}
 
/*!
    \internal
*/
QPainterState *QRasterPaintEngine::createState(QPainterState *orig) const
{
    QRasterPaintEngineState *s;
    if (!orig)
        s = new QRasterPaintEngineState();
    else
        s = new QRasterPaintEngineState(*static_cast<QRasterPaintEngineState *>(orig));
 
    return s;
}
 
/*!
    \internal
*/
void QRasterPaintEngine::setState(QPainterState *s)
{
    Q_D(QRasterPaintEngine);
    QPaintEngineEx::setState(s);
    QRasterPaintEngineState *t = state();
    if (t->clip && t->clip->enabled != t->clipEnabled) {
        // Since we do not "detach" clipdata when changing only enabled state, we need to resync state here
        t->clip->enabled = t->clipEnabled;
    }
    d->rasterBuffer->compositionMode = s->composition_mode;
}
 
/*!
    \fn QRasterPaintEngineState *QRasterPaintEngine::state()
    \internal
*/
 
/*!
    \fn const QRasterPaintEngineState *QRasterPaintEngine::state() const
    \internal
*/
 
/*!
    \internal
*/
void QRasterPaintEngine::penChanged()
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::penChanged():" << state()->pen;
#endif
    QRasterPaintEngineState *s = state();
    Q_ASSERT(s);
    s->strokeFlags |= DirtyPen;
    s->dirty |= DirtyPen;
}
 
/*!
    \internal
*/
void QRasterPaintEngine::updatePen(const QPen &pen)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::updatePen():" << s->pen;
#endif
 
    Qt::PenStyle pen_style = qpen_style(pen);
 
    s->lastPen = pen;
    s->strokeFlags = 0;
 
    s->penData.clip = d->clip();
    s->penData.setup(pen_style == Qt::NoPen ? QBrush() : pen.brush(), s->intOpacity,
                     s->composition_mode, s->flags.cosmetic_brush);
 
    if (s->strokeFlags & QRasterPaintEngine::DirtyTransform
        || pen.brush().transform().type() >= QTransform::TxNone) {
        d->updateMatrixData(&s->penData, pen.brush(), s->matrix);
    }
 
    // Slightly ugly handling of an uncommon case... We need to change
    // the pen because it is reused in draw_midpoint to decide dashed
    // or non-dashed.
    if (pen_style == Qt::CustomDashLine && pen.dashPattern().size() == 0) {
        pen_style = Qt::SolidLine;
        s->lastPen.setStyle(Qt::SolidLine);
    }
 
    d->basicStroker.setJoinStyle(qpen_joinStyle(pen));
    d->basicStroker.setCapStyle(qpen_capStyle(pen));
    d->basicStroker.setMiterLimit(pen.miterLimit());
 
    qreal penWidth = qpen_widthf(pen);
    if (penWidth == 0)
        d->basicStroker.setStrokeWidth(1);
    else
        d->basicStroker.setStrokeWidth(penWidth);
 
    if (pen_style == Qt::SolidLine) {
        s->stroker = &d->basicStroker;
    } else if (pen_style != Qt::NoPen) {
        if (!d->dashStroker)
            d->dashStroker.reset(new QDashStroker(&d->basicStroker));
        if (pen.isCosmetic()) {
            d->dashStroker->setClipRect(d->deviceRect);
        } else {
            // ### I've seen this inverted devrect multiple places now...
            QRectF clipRect = s->matrix.inverted().mapRect(QRectF(d->deviceRect));
            d->dashStroker->setClipRect(clipRect);
        }
        d->dashStroker->setDashPattern(pen.dashPattern());
        d->dashStroker->setDashOffset(pen.dashOffset());
        s->stroker = d->dashStroker.data();
    } else {
        s->stroker = nullptr;
    }
 
    ensureRasterState(); // needed because of tx_noshear...
    bool cosmetic = pen.isCosmetic();
    s->flags.fast_pen = pen_style > Qt::NoPen
            && s->penData.blend
            && ((cosmetic && penWidth <= 1)
                || (!cosmetic && (s->flags.tx_noshear || !s->flags.antialiased) && penWidth * s->txscale <= 1));
 
    s->flags.non_complex_pen = qpen_capStyle(s->lastPen) <= Qt::SquareCap && s->flags.tx_noshear;
 
    s->strokeFlags = 0;
}
 
 
 
/*!
    \internal
*/
void QRasterPaintEngine::brushOriginChanged()
{
    QRasterPaintEngineState *s = state();
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::brushOriginChanged()" << s->brushOrigin;
#endif
 
    s->fillFlags |= DirtyBrushOrigin;
}
 
 
/*!
    \internal
*/
void QRasterPaintEngine::brushChanged()
{
    QRasterPaintEngineState *s = state();
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::brushChanged():" << s->brush;
#endif
    s->fillFlags |= DirtyBrush;
}
 
 
 
 
/*!
    \internal
*/
void QRasterPaintEngine::updateBrush(const QBrush &brush)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::updateBrush()" << brush;
#endif
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
    // must set clip prior to setup, as setup uses it...
    s->brushData.clip = d->clip();
    s->brushData.setup(brush, s->intOpacity, s->composition_mode, s->flags.cosmetic_brush);
    if (s->fillFlags & DirtyTransform
        || brush.transform().type() >= QTransform::TxNone)
        d_func()->updateMatrixData(&s->brushData, brush, d->brushMatrix());
    s->lastBrush = brush;
    s->fillFlags = 0;
}
 
void QRasterPaintEngine::updateOutlineMapper()
{
    Q_D(QRasterPaintEngine);
    d->outlineMapper->setMatrix(state()->matrix);
}
 
void QRasterPaintEngine::updateRasterState()
{
    QRasterPaintEngineState *s = state();
 
    if (s->dirty & DirtyTransform)
        updateMatrix(s->matrix);
 
    if (s->dirty & (DirtyPen|DirtyCompositionMode|DirtyOpacity)) {
        const QPainter::CompositionMode mode = s->composition_mode;
        s->flags.fast_text = (s->penData.type == QSpanData::Solid)
                       && s->intOpacity == 256
                       && (mode == QPainter::CompositionMode_SourceOver
                           || (mode == QPainter::CompositionMode_Source
                               && (s->penData.solidColor.spec() != QColor::ExtendedRgb &&
                                   s->penData.solidColor.alphaF() >= 1.0f)));
    }
 
    s->dirty = 0;
}
 
 
/*!
    \internal
*/
void QRasterPaintEngine::opacityChanged()
{
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::opacityChanged()" << s->opacity;
#endif
 
    s->fillFlags |= DirtyOpacity;
    s->strokeFlags |= DirtyOpacity;
    s->pixmapFlags |= DirtyOpacity;
    s->dirty |= DirtyOpacity;
    s->intOpacity = (int) (s->opacity * 256);
}
 
/*!
    \internal
*/
void QRasterPaintEngine::compositionModeChanged()
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::compositionModeChanged()" << s->composition_mode;
#endif
 
    s->fillFlags |= DirtyCompositionMode;
    s->dirty |= DirtyCompositionMode;
 
    s->strokeFlags |= DirtyCompositionMode;
    d->rasterBuffer->compositionMode = s->composition_mode;
 
    d->recalculateFastImages();
}
 
/*!
    \internal
*/
void QRasterPaintEngine::renderHintsChanged()
{
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::renderHintsChanged()" << Qt::hex << s->renderHints;
#endif
 
    bool was_aa = s->flags.antialiased;
    bool was_bilinear = s->flags.bilinear;
    bool was_cosmetic_brush = s->flags.cosmetic_brush;
 
    s->flags.antialiased = bool(s->renderHints & QPainter::Antialiasing);
    s->flags.bilinear = bool(s->renderHints & QPainter::SmoothPixmapTransform);
    s->flags.cosmetic_brush = !bool(s->renderHints & QPainter::NonCosmeticBrushPatterns);
 
    if (was_aa != s->flags.antialiased)
        s->strokeFlags |= DirtyHints;
 
    if (was_bilinear != s->flags.bilinear || was_cosmetic_brush != s->flags.cosmetic_brush) {
        s->strokeFlags |= DirtyPen;
        s->fillFlags |= DirtyBrush;
    }
 
    Q_D(QRasterPaintEngine);
    d->recalculateFastImages();
 
    if (was_aa != s->flags.antialiased)
        d->updateClipping();
}
 
/*!
    \internal
*/
void QRasterPaintEngine::transformChanged()
{
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::transformChanged()" << s->matrix;
#endif
 
    s->fillFlags |= DirtyTransform;
    s->strokeFlags |= DirtyTransform;
 
    s->dirty |= DirtyTransform;
 
    Q_D(QRasterPaintEngine);
    d->recalculateFastImages();
}
 
/*!
    \internal
*/
void QRasterPaintEngine::clipEnabledChanged()
{
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::clipEnabledChanged()" << s->clipEnabled;
#endif
 
    if (s->clip) {
        s->clip->enabled = s->clipEnabled;
        s->fillFlags |= DirtyClipEnabled;
        s->strokeFlags |= DirtyClipEnabled;
        s->pixmapFlags |= DirtyClipEnabled;
    }
}
 
void QRasterPaintEnginePrivate::drawImage(const QPointF &pt,
                                          const QImage &img,
                                          SrcOverBlendFunc func,
                                          const QRect &clip,
                                          int alpha,
                                          const QRect &sr)
{
    if (alpha == 0 || !clip.isValid())
        return;
    if (pt.x() > qreal(clip.right()) || pt.y() > qreal(clip.bottom()))
        return;
    if ((pt.x() + img.width()) < qreal(clip.left()) || (pt.y() + img.height()) < qreal(clip.top()))
        return;
 
    Q_ASSERT(img.depth() >= 8);
 
    qsizetype srcBPL = img.bytesPerLine();
    const uchar *srcBits = img.bits();
    int srcSize = img.depth() >> 3; // This is the part that is incompatible with lower than 8-bit..
    int iw = img.width();
    int ih = img.height();
 
    if (!sr.isEmpty()) {
        iw = sr.width();
        ih = sr.height();
        // Adjust the image according to the source offset...
        srcBits += ((sr.y() * srcBPL) + sr.x() * srcSize);
    }
 
    // adapt the x parameters
    int x = qRound(pt.x());
    int cx1 = clip.x();
    int cx2 = clip.x() + clip.width();
    if (x < cx1) {
        int d = cx1 - x;
        srcBits += srcSize * d;
        iw -= d;
        x = cx1;
    }
    if (x + iw > cx2) {
        int d = x + iw - cx2;
        iw -= d;
    }
    if (iw <= 0)
        return;
 
    // adapt the y parameters...
    int cy1 = clip.y();
    int cy2 = clip.y() + clip.height();
    int y = qRound(pt.y());
    if (y < cy1) {
        int d = cy1 - y;
        srcBits += srcBPL * d;
        ih -= d;
        y = cy1;
    }
    if (y + ih > cy2) {
        int d = y + ih - cy2;
        ih -= d;
    }
    if (ih <= 0)
        return;
 
    // call the blend function...
    int dstSize = rasterBuffer->bytesPerPixel();
    qsizetype dstBPL = rasterBuffer->bytesPerLine();
    func(rasterBuffer->buffer() + x * dstSize + y * dstBPL, dstBPL,
         srcBits, srcBPL,
         iw, ih,
         alpha);
}
 
void QRasterPaintEnginePrivate::blitImage(const QPointF &pt,
                                          const QImage &img,
                                          const QRect &clip,
                                          const QRect &sr)
{
    if (!clip.isValid())
        return;
    if (pt.x() > qreal(clip.right()) || pt.y() > qreal(clip.bottom()))
        return;
    if ((pt.x() + img.width()) < qreal(clip.left()) || (pt.y() + img.height()) < qreal(clip.top()))
        return;
 
    Q_ASSERT(img.depth() >= 8);
 
    qsizetype srcBPL = img.bytesPerLine();
    const uchar *srcBits = img.bits();
    int srcSize = img.depth() >> 3; // This is the part that is incompatible with lower than 8-bit..
    int iw = img.width();
    int ih = img.height();
 
    if (!sr.isEmpty()) {
        iw = sr.width();
        ih = sr.height();
        // Adjust the image according to the source offset...
        srcBits += ((sr.y() * srcBPL) + sr.x() * srcSize);
    }
 
    // adapt the x parameters
    int x = qRound(pt.x());
    int cx1 = clip.x();
    int cx2 = clip.x() + clip.width();
    if (x < cx1) {
        int d = cx1 - x;
        srcBits += srcSize * d;
        iw -= d;
        x = cx1;
    }
    if (x + iw > cx2) {
        int d = x + iw - cx2;
        iw -= d;
    }
    if (iw <= 0)
        return;
 
    // adapt the y parameters...
    int cy1 = clip.y();
    int cy2 = clip.y() + clip.height();
    int y = qRound(pt.y());
    if (y < cy1) {
        int d = cy1 - y;
        srcBits += srcBPL * d;
        ih -= d;
        y = cy1;
    }
    if (y + ih > cy2) {
        int d = y + ih - cy2;
        ih -= d;
    }
    if (ih <= 0)
        return;
 
    // blit..
    int dstSize = rasterBuffer->bytesPerPixel();
    qsizetype dstBPL = rasterBuffer->bytesPerLine();
    const uint *src = (const uint *) srcBits;
    uint *dst = reinterpret_cast<uint *>(rasterBuffer->buffer() + x * dstSize + y * dstBPL);
 
    const int len = iw * (qt_depthForFormat(rasterBuffer->format) >> 3);
    for (int y = 0; y < ih; ++y) {
        memcpy(dst, src, len);
        dst = (quint32 *)(((uchar *) dst) + dstBPL);
        src = (const quint32 *)(((const uchar *) src) + srcBPL);
    }
}
 
 
void QRasterPaintEnginePrivate::systemStateChanged()
{
    deviceRectUnclipped = QRect(0, 0,
            qMin(QT_RASTER_COORD_LIMIT, device->width()),
            qMin(QT_RASTER_COORD_LIMIT, device->height()));
 
    if (!systemClip.isEmpty()) {
        QRegion clippedDeviceRgn = systemClip & deviceRectUnclipped;
        deviceRect = clippedDeviceRgn.boundingRect();
        baseClip->setClipRegion(clippedDeviceRgn);
    } else {
        deviceRect = deviceRectUnclipped;
        baseClip->setClipRect(deviceRect);
    }
#ifdef QT_DEBUG_DRAW
    qDebug() << "systemStateChanged" << this << "deviceRect" << deviceRect << deviceRectUnclipped << systemClip;
#endif
 
    exDeviceRect = deviceRect;
 
    Q_Q(QRasterPaintEngine);
    if (q->state()) {
        q->state()->strokeFlags |= QPaintEngine::DirtyClipRegion;
        q->state()->fillFlags |= QPaintEngine::DirtyClipRegion;
        q->state()->pixmapFlags |= QPaintEngine::DirtyClipRegion;
    }
}
 
void QRasterPaintEnginePrivate::updateMatrixData(QSpanData *spanData, const QBrush &b, const QTransform &m)
{
    if (b.d->style == Qt::NoBrush || b.d->style == Qt::SolidPattern)
        return;
 
    Q_Q(QRasterPaintEngine);
    bool bilinear = q->state()->flags.bilinear;
 
    if (b.d->transform.type() > QTransform::TxNone) { // FALCON: optimize
        spanData->setupMatrix(b.transform() * m, bilinear);
    } else {
        if (m.type() <= QTransform::TxTranslate) {
            // specialize setupMatrix for translation matrices
            // to avoid needless matrix inversion
            spanData->m11 = 1;
            spanData->m12 = 0;
            spanData->m13 = 0;
            spanData->m21 = 0;
            spanData->m22 = 1;
            spanData->m23 = 0;
            spanData->m33 = 1;
            spanData->dx = -m.dx();
            spanData->dy = -m.dy();
            spanData->txop = m.type();
            spanData->bilinear = bilinear;
            spanData->fast_matrix = qAbs(m.dx()) < 1e4 && qAbs(m.dy()) < 1e4;
            spanData->adjustSpanMethods();
        } else {
            spanData->setupMatrix(m, bilinear);
        }
    }
}
 
// #define QT_CLIPPING_RATIOS
 
#ifdef QT_CLIPPING_RATIOS
int rectClips;
int regionClips;
int totalClips;
 
static void checkClipRatios(QRasterPaintEnginePrivate *d)
{
    if (d->clip()->hasRectClip)
        rectClips++;
    if (d->clip()->hasRegionClip)
        regionClips++;
    totalClips++;
 
    if ((totalClips % 5000) == 0) {
        printf("Clipping ratio: rectangular=%f%%, region=%f%%, complex=%f%%\n",
               rectClips * 100.0 / (qreal) totalClips,
               regionClips * 100.0 / (qreal) totalClips,
               (totalClips - rectClips - regionClips) * 100.0 / (qreal) totalClips);
        totalClips = 0;
        rectClips = 0;
        regionClips = 0;
    }
 
}
#endif
 
static void qrasterpaintengine_state_setNoClip(QRasterPaintEngineState *s)
{
    if (s->flags.has_clip_ownership)
        delete s->clip;
    s->clip = nullptr;
    s->flags.has_clip_ownership = false;
}
 
static void qrasterpaintengine_dirty_clip(QRasterPaintEnginePrivate *d, QRasterPaintEngineState *s)
{
    s->fillFlags |= QPaintEngine::DirtyClipPath;
    s->strokeFlags |= QPaintEngine::DirtyClipPath;
    s->pixmapFlags |= QPaintEngine::DirtyClipPath;
 
    d->solid_color_filler.clip = d->clip();
    d->solid_color_filler.adjustSpanMethods();
 
#ifdef QT_DEBUG_DRAW
    dumpClip(d->rasterBuffer->width(), d->rasterBuffer->height(), &*d->clip());
#endif
 
}
 
 
/*!
    \internal
*/
void QRasterPaintEngine::clip(const QVectorPath &path, Qt::ClipOperation op)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::clip(): " << path << op;
 
    if (path.elements()) {
        for (int i=0; i<path.elementCount(); ++i) {
            qDebug() << " - " << path.elements()[i]
                     << '(' << path.points()[i*2] << ", " << path.points()[i*2+1] << ')';
        }
    } else {
        for (int i=0; i<path.elementCount(); ++i) {
            qDebug() << " ---- "
                     << '(' << path.points()[i*2] << ", " << path.points()[i*2+1] << ')';
        }
    }
#endif
 
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    // There are some cases that are not supported by clip(QRect)
    if (op != Qt::IntersectClip || !s->clip || s->clip->hasRectClip || s->clip->hasRegionClip) {
        if (s->matrix.type() <= QTransform::TxScale
            && path.isRect()) {
#ifdef QT_DEBUG_DRAW
            qDebug(" --- optimizing vector clip to rect clip...");
#endif
            const qreal *points = path.points();
            QRectF r(points[0], points[1], points[4]-points[0], points[5]-points[1]);
            if (setClipRectInDeviceCoords(qt_mapFillRect(r, s->matrix), op))
                return;
        }
    }
 
    if (op == Qt::NoClip) {
        qrasterpaintengine_state_setNoClip(s);
 
    } else {
        QClipData *base = d->baseClip.data();
 
        // Intersect with current clip when available...
        if (op == Qt::IntersectClip && s->clip)
            base = s->clip;
 
        // We always intersect, except when there is nothing to
        // intersect with, in which case we simplify the operation to
        // a replace...
        Qt::ClipOperation isectOp = Qt::IntersectClip;
        if (base == nullptr)
            isectOp = Qt::ReplaceClip;
 
        QClipData *newClip = new QClipData(d->rasterBuffer->height());
        newClip->initialize();
        ClipData clipData = { base, newClip, isectOp };
        ensureOutlineMapper();
        d->rasterize(d->outlineMapper->convertPath(path), qt_span_clip, &clipData, nullptr);
 
        newClip->fixup();
 
        if (s->flags.has_clip_ownership)
            delete s->clip;
 
        s->clip = newClip;
        s->flags.has_clip_ownership = true;
    }
    qrasterpaintengine_dirty_clip(d, s);
}
 
 
 
/*!
    \internal
*/
void QRasterPaintEngine::clip(const QRect &rect, Qt::ClipOperation op)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::clip(): " << rect << op;
#endif
 
    QRasterPaintEngineState *s = state();
 
    if (op == Qt::NoClip) {
        qrasterpaintengine_state_setNoClip(s);
 
    } else if (s->matrix.type() > QTransform::TxScale) {
        QPaintEngineEx::clip(rect, op);
        return;
 
    } else if (!setClipRectInDeviceCoords(qt_mapFillRect(rect, s->matrix), op)) {
        QPaintEngineEx::clip(rect, op);
        return;
    }
}
 
 
bool QRasterPaintEngine::setClipRectInDeviceCoords(const QRect &r, Qt::ClipOperation op)
{
    Q_D(QRasterPaintEngine);
    QRect clipRect = r & d->deviceRect;
    QRasterPaintEngineState *s = state();
 
    if (op == Qt::ReplaceClip || s->clip == nullptr) {
 
        // No current clip, hence we intersect with sysclip and be
        // done with it...
        QRegion clipRegion = systemClip();
        QClipData *clip = new QClipData(d->rasterBuffer->height());
 
        if (clipRegion.isEmpty())
            clip->setClipRect(clipRect);
        else
            clip->setClipRegion(clipRegion & clipRect);
 
        if (s->flags.has_clip_ownership)
            delete s->clip;
 
        s->clip = clip;
        s->clip->enabled = true;
        s->flags.has_clip_ownership = true;
 
    } else if (op == Qt::IntersectClip){ // intersect clip with current clip
        QClipData *base = s->clip;
 
        Q_ASSERT(base);
        if (base->hasRectClip || base->hasRegionClip) {
            if (!s->flags.has_clip_ownership) {
                s->clip = new QClipData(d->rasterBuffer->height());
                s->flags.has_clip_ownership = true;
            }
            if (base->hasRectClip)
                s->clip->setClipRect(base->clipRect & clipRect);
            else
                s->clip->setClipRegion(base->clipRegion & clipRect);
            s->clip->enabled = true;
        } else {
            return false;
        }
    } else {
        return false;
    }
 
    qrasterpaintengine_dirty_clip(d, s);
    return true;
}
 
 
/*!
    \internal
*/
void QRasterPaintEngine::clip(const QRegion &region, Qt::ClipOperation op)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::clip(): " << region << op;
#endif
 
    Q_D(QRasterPaintEngine);
 
    if (region.rectCount() == 1) {
        clip(region.boundingRect(), op);
        return;
    }
 
    QRasterPaintEngineState *s = state();
    const QClipData *clip = d->clip();
    const QClipData *baseClip = d->baseClip.data();
 
    if (op == Qt::NoClip) {
        qrasterpaintengine_state_setNoClip(s);
    } else if (s->matrix.type() > QTransform::TxScale
               || (op == Qt::IntersectClip && !clip->hasRectClip && !clip->hasRegionClip)
               || (op == Qt::ReplaceClip && !baseClip->hasRectClip && !baseClip->hasRegionClip)) {
        QPaintEngineEx::clip(region, op);
    } else {
        const QClipData *curClip;
        QClipData *newClip;
 
        if (op == Qt::IntersectClip)
            curClip = clip;
        else
            curClip = baseClip;
 
        if (s->flags.has_clip_ownership) {
            newClip = s->clip;
            Q_ASSERT(newClip);
        } else {
            newClip = new QClipData(d->rasterBuffer->height());
            s->clip = newClip;
            s->flags.has_clip_ownership = true;
        }
 
        QRegion r = s->matrix.map(region);
        if (curClip->hasRectClip)
            newClip->setClipRegion(r & curClip->clipRect);
        else if (curClip->hasRegionClip)
            newClip->setClipRegion(r & curClip->clipRegion);
 
        qrasterpaintengine_dirty_clip(d, s);
    }
}
 
/*!
 \fn const QClipData *QRasterPaintEngine::clipData() const
 
 \internal
*/
 
 
/*!
    \internal
*/
void QRasterPaintEngine::fillPath(const QPainterPath &path, QSpanData *fillData)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " --- fillPath, bounds=" << path.boundingRect();
#endif
 
    if (!fillData->blend)
        return;
 
    Q_D(QRasterPaintEngine);
 
    const QRectF controlPointRect = path.controlPointRect();
 
    QRasterPaintEngineState *s = state();
    const QRect deviceRect = s->matrix.mapRect(controlPointRect).toRect();
    ProcessSpans blend = d->getBrushFunc(deviceRect, fillData);
    const bool do_clip = (deviceRect.left() < -QT_RASTER_COORD_LIMIT
                          || deviceRect.right() > QT_RASTER_COORD_LIMIT
                          || deviceRect.top() < -QT_RASTER_COORD_LIMIT
                          || deviceRect.bottom() > QT_RASTER_COORD_LIMIT);
 
    if (!s->flags.antialiased && !do_clip) {
        d->initializeRasterizer(fillData);
        d->rasterizer->rasterize(path * s->matrix, path.fillRule());
        return;
    }
 
    ensureOutlineMapper();
    d->rasterize(d->outlineMapper->convertPath(path), blend, fillData, d->rasterBuffer.data());
}
 
static void fillRect_normalized(const QRect &r, QSpanData *data,
                                QRasterPaintEnginePrivate *pe)
{
    int x1, x2, y1, y2;
 
    bool rectClipped = true;
 
    if (data->clip) {
        x1 = qMax(r.x(), data->clip->xmin);
        x2 = qMin(r.x() + r.width(), data->clip->xmax);
        y1 = qMax(r.y(), data->clip->ymin);
        y2 = qMin(r.y() + r.height(), data->clip->ymax);
        rectClipped = data->clip->hasRectClip;
 
    } else if (pe) {
        x1 = qMax(r.x(), pe->deviceRect.x());
        x2 = qMin(r.x() + r.width(), pe->deviceRect.x() + pe->deviceRect.width());
        y1 = qMax(r.y(), pe->deviceRect.y());
        y2 = qMin(r.y() + r.height(), pe->deviceRect.y() + pe->deviceRect.height());
    } else {
        x1 = qMax(r.x(), 0);
        x2 = qMin(r.x() + r.width(), data->rasterBuffer->width());
        y1 = qMax(r.y(), 0);
        y2 = qMin(r.y() + r.height(), data->rasterBuffer->height());
    }
 
    if (x2 <= x1 || y2 <= y1)
        return;
 
    const int width = x2 - x1;
    const int height = y2 - y1;
 
    bool isUnclipped = rectClipped
                       || (pe && pe->isUnclipped_normalized(QRect(x1, y1, width, height)));
 
    if (pe && isUnclipped) {
        const QPainter::CompositionMode mode = pe->rasterBuffer->compositionMode;
 
        if (data->fillRect && (mode == QPainter::CompositionMode_Source
                               || (mode == QPainter::CompositionMode_SourceOver
                                   && (data->solidColor.spec() != QColor::ExtendedRgb &&
                                       data->solidColor.alphaF() >= 1.0f))))
        {
            data->fillRect(data->rasterBuffer, x1, y1, width, height, data->solidColor.rgba64());
            return;
        }
    }
 
    ProcessSpans blend = isUnclipped ? data->unclipped_blend : data->blend;
 
    const int nspans = 512;
    Q_DECL_UNINITIALIZED QT_FT_Span spans[nspans];
 
    Q_ASSERT(data->blend);
    int y = y1;
    while (y < y2) {
        int n = qMin(nspans, y2 - y);
        int i = 0;
        while (i < n) {
            spans[i].x = x1;
            spans[i].len = width;
            spans[i].y = y + i;
            spans[i].coverage = 255;
            ++i;
        }
 
        blend(n, spans, data);
        y += n;
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawRects(const QRect *rects, int rectCount)
{
#ifdef QT_DEBUG_DRAW
    qDebug(" - QRasterPaintEngine::drawRect(), rectCount=%d", rectCount);
#endif
    Q_D(QRasterPaintEngine);
    ensureRasterState();
    QRasterPaintEngineState *s = state();
 
    // Fill
    ensureBrush();
    if (s->brushData.blend) {
        if (!s->flags.antialiased && s->matrix.type() <= QTransform::TxTranslate) {
            const QRect *r = rects;
            const QRect *lastRect = rects + rectCount;
 
            int offset_x = int(s->matrix.dx());
            int offset_y = int(s->matrix.dy());
            while (r < lastRect) {
                QRect rect = r->normalized();
                QRect rr = rect.translated(offset_x, offset_y);
                fillRect_normalized(rr, &s->brushData, d);
                ++r;
            }
        } else {
            QRectVectorPath path;
            for (int i=0; i<rectCount; ++i) {
                path.set(rects[i]);
                fill(path, s->brush);
            }
        }
    }
 
    ensurePen();
    if (s->penData.blend) {
        QRectVectorPath path;
        if (s->flags.fast_pen) {
            QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
            for (int i = 0; i < rectCount; ++i) {
                path.set(rects[i]);
                stroker.drawPath(path);
            }
        } else {
            for (int i = 0; i < rectCount; ++i) {
                path.set(rects[i]);
                stroke(path, s->pen);
            }
        }
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawRects(const QRectF *rects, int rectCount)
{
#ifdef QT_DEBUG_DRAW
    qDebug(" - QRasterPaintEngine::drawRect(QRectF*), rectCount=%d", rectCount);
#endif
#ifdef QT_FAST_SPANS
    Q_D(QRasterPaintEngine);
    ensureRasterState();
    QRasterPaintEngineState *s = state();
 
 
    if (s->flags.tx_noshear) {
        ensureBrush();
        if (s->brushData.blend) {
            d->initializeRasterizer(&s->brushData);
            for (int i = 0; i < rectCount; ++i) {
                const QRectF &rect = rects[i].normalized();
                if (rect.isEmpty())
                    continue;
                const QPointF a = s->matrix.map((rect.topLeft() + rect.bottomLeft()) * 0.5f);
                const QPointF b = s->matrix.map((rect.topRight() + rect.bottomRight()) * 0.5f);
                d->rasterizer->rasterizeLine(a, b, rect.height() / rect.width());
            }
        }
 
        ensurePen();
        if (s->penData.blend) {
            QRectVectorPath path;
            if (s->flags.fast_pen) {
                QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
                for (int i = 0; i < rectCount; ++i) {
                    path.set(rects[i]);
                    stroker.drawPath(path);
                }
            } else {
                for (int i = 0; i < rectCount; ++i) {
                    path.set(rects[i]);
                    QPaintEngineEx::stroke(path, s->lastPen);
                }
            }
        }
 
        return;
    }
#endif // QT_FAST_SPANS
    QPaintEngineEx::drawRects(rects, rectCount);
}
 
 
/*!
    \internal
*/
void QRasterPaintEngine::stroke(const QVectorPath &path, const QPen &pen)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen(pen);
    if (!s->penData.blend)
        return;
 
    if (s->flags.fast_pen) {
        QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
        stroker.drawPath(path);
    } else if (s->flags.non_complex_pen && path.shape() == QVectorPath::LinesHint) {
        qreal width = s->lastPen.isCosmetic()
                      ? (qpen_widthf(s->lastPen) == 0 ? 1 : qpen_widthf(s->lastPen))
                      : qpen_widthf(s->lastPen) * s->txscale;
        int dashIndex = 0;
        qreal dashOffset = s->lastPen.dashOffset();
        bool inDash = true;
        qreal patternLength = 0;
        const QList<qreal> pattern = s->lastPen.dashPattern();
        for (int i = 0; i < pattern.size(); ++i)
            patternLength += pattern.at(i);
 
        if (patternLength > 0) {
            dashOffset = std::fmod(dashOffset, patternLength);
            if (dashOffset < 0)
                dashOffset += patternLength;
            while (dashOffset >= pattern.at(dashIndex)) {
                dashOffset -= pattern.at(dashIndex);
                if (++dashIndex >= pattern.size())
                    dashIndex = 0;
                inDash = !inDash;
            }
        }
 
        Q_D(QRasterPaintEngine);
        d->initializeRasterizer(&s->penData);
        int lineCount = path.elementCount() / 2;
        const QLineF *lines = reinterpret_cast<const QLineF *>(path.points());
 
        for (int i = 0; i < lineCount; ++i) {
            const QLineF line = s->matrix.map(lines[i]);
            if (line.p1() == line.p2()) {
                if (s->lastPen.capStyle() != Qt::FlatCap) {
                    const QPointF delta(width / 2, 0);
                    d->rasterizer->rasterizeLine(line.p1() - delta, line.p1() + delta, 1);
                }
                continue;
            }
 
            if (qpen_style(s->lastPen) == Qt::SolidLine) {
                d->rasterizer->rasterizeLine(line.p1(), line.p2(),
                                            width / line.length(),
                                            s->lastPen.capStyle() == Qt::SquareCap);
            } else {
                // LinesHint means each line is distinct, so restart dashing
                int dIndex = dashIndex;
                qreal dOffset = dashOffset;
                bool inD = inDash;
                d->rasterizeLine_dashed(line, width, &dIndex, &dOffset, &inD);
            }
        }
    }
    else
        QPaintEngineEx::stroke(path, pen);
}
 
QRect QRasterPaintEngine::toNormalizedFillRect(const QRectF &rect)
{
    int x1 = qRound(rect.x());
    int y1 = qRound(rect.y());
    int x2 = qRound(rect.right());
    int y2 = qRound(rect.bottom());
 
    if (x2 < x1)
        qSwap(x1, x2);
    if (y2 < y1)
        qSwap(y1, y2);
 
    return QRect(x1, y1, x2 - x1, y2 - y1);
}
 
/*!
    \internal
*/
void QRasterPaintEngine::fill(const QVectorPath &path, const QBrush &brush)
{
    if (path.isEmpty())
        return;
#ifdef QT_DEBUG_DRAW
    QRectF rf = path.controlPointRect();
    qDebug() << "QRasterPaintEngine::fill(): "
             << "size=" << path.elementCount()
             << ", hints=" << Qt::hex << path.hints()
             << rf << brush;
#endif
 
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensureBrush(brush);
    if (!s->brushData.blend)
        return;
 
    if (path.shape() == QVectorPath::RectangleHint) {
        if (!s->flags.antialiased && s->matrix.type() <= QTransform::TxScale) {
            const qreal *p = path.points();
            QPointF tl = QPointF(p[0], p[1]) * s->matrix;
            QPointF br = QPointF(p[4], p[5]) * s->matrix;
            fillRect_normalized(toNormalizedFillRect(QRectF(tl, br)), &s->brushData, d);
            return;
        }
        ensureRasterState();
        if (s->flags.tx_noshear) {
            d->initializeRasterizer(&s->brushData);
            // ### Is normalizing really necessary here?
            const qreal *p = path.points();
            QRectF r = QRectF(p[0], p[1], p[2] - p[0], p[7] - p[1]).normalized();
            if (!r.isEmpty()) {
                const QPointF a = s->matrix.map((r.topLeft() + r.bottomLeft()) * 0.5f);
                const QPointF b = s->matrix.map((r.topRight() + r.bottomRight()) * 0.5f);
                d->rasterizer->rasterizeLine(a, b, r.height() / r.width());
            }
            return;
        }
    }
 
    // ### Optimize for non transformed ellipses and rectangles...
    QRectF cpRect = path.controlPointRect();
    const QRectF pathDeviceRect = s->matrix.mapRect(cpRect);
    // Skip paths that by conservative estimates are completely outside the paint device.
    if (!pathDeviceRect.intersects(QRectF(d->deviceRect)) || !pathDeviceRect.isValid())
        return;
 
    ProcessSpans blend = d->getBrushFunc(pathDeviceRect, &s->brushData);
 
        // ### Falcon
//         const bool do_clip = (deviceRect.left() < -QT_RASTER_COORD_LIMIT
//                               || deviceRect.right() > QT_RASTER_COORD_LIMIT
//                               || deviceRect.top() < -QT_RASTER_COORD_LIMIT
//                               || deviceRect.bottom() > QT_RASTER_COORD_LIMIT);
 
        // ### Falonc: implement....
//         if (!s->flags.antialiased && !do_clip) {
//             d->initializeRasterizer(&s->brushData);
//             d->rasterizer->rasterize(path * d->matrix, path.fillRule());
//             return;
//         }
 
    ensureOutlineMapper();
    d->rasterize(d->outlineMapper->convertPath(path), blend, &s->brushData, d->rasterBuffer.data());
}
 
void QRasterPaintEngine::fillRect(const QRectF &r, QSpanData *data)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    if (!s->flags.antialiased) {
        uint txop = s->matrix.type();
        if (txop == QTransform::TxNone) {
            fillRect_normalized(toNormalizedFillRect(r), data, d);
            return;
        } else if (txop == QTransform::TxTranslate) {
            const QRect rr = toNormalizedFillRect(r.translated(s->matrix.dx(), s->matrix.dy()));
            fillRect_normalized(rr, data, d);
            return;
        } else if (txop == QTransform::TxScale) {
            const QRect rr = toNormalizedFillRect(s->matrix.mapRect(r));
            fillRect_normalized(rr, data, d);
            return;
        }
    }
    ensureRasterState();
    if (s->flags.tx_noshear) {
        d->initializeRasterizer(data);
        QRectF nr = r.normalized();
        if (!nr.isEmpty()) {
            const QPointF a = s->matrix.map((nr.topLeft() + nr.bottomLeft()) * 0.5f);
            const QPointF b = s->matrix.map((nr.topRight() + nr.bottomRight()) * 0.5f);
            d->rasterizer->rasterizeLine(a, b, nr.height() / nr.width());
        }
        return;
    }
 
    QPainterPath path;
    path.addRect(r);
    ensureOutlineMapper();
    fillPath(path, data);
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::fillRect(const QRectF &r, const QBrush &brush)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::fillRecct(): " << r << brush;
#endif
    QRasterPaintEngineState *s = state();
 
    ensureBrush(brush);
    if (!s->brushData.blend)
        return;
 
    fillRect(r, &s->brushData);
}
 
static QColor qPremultiplyWithExtraAlpha(const QColor &c, int alpha)
{
    if (alpha == 0)
        return Qt::transparent;
    if (c.spec() == QColor::ExtendedRgb) {
        float r, g, b, a;
        c.getRgbF(&r, &g, &b, &a);
        a = a * alpha * (1.f / 256.f);
        return QColor::fromRgbF(r * a, g * a, b * a, a);
    }
    return qPremultiply(combineAlpha256(c.rgba64(), alpha));
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::fillRect(const QRectF &r, const QColor &color)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::fillRect(): " << r << color;
#endif
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    d->solid_color_filler.solidColor = qPremultiplyWithExtraAlpha(color, s->intOpacity);
 
    if (d->solid_color_filler.solidColor.alphaF() <= 0.0f
        && s->composition_mode == QPainter::CompositionMode_SourceOver) {
        return;
    }
    d->solid_color_filler.clip = d->clip();
    d->solid_color_filler.adjustSpanMethods();
    fillRect(r, &d->solid_color_filler);
}
 
static inline bool isAbove(const QPointF *a, const QPointF *b)
{
    return a->y() < b->y();
}
 
static bool splitPolygon(const QPointF *points, int pointCount, QList<QPointF> *upper, QList<QPointF> *lower)
{
    Q_ASSERT(upper);
    Q_ASSERT(lower);
 
    Q_ASSERT(pointCount >= 2);
 
    QList<const QPointF *> sorted;
    sorted.reserve(pointCount);
 
    upper->reserve(pointCount * 3 / 4);
    lower->reserve(pointCount * 3 / 4);
 
    for (int i = 0; i < pointCount; ++i)
        sorted << points + i;
 
    std::sort(sorted.begin(), sorted.end(), isAbove);
 
    qreal splitY = sorted.at(sorted.size() / 2)->y();
 
    const QPointF *end = points + pointCount;
    const QPointF *last = end - 1;
 
    QList<QPointF> *bin[2] = { upper, lower };
 
    for (const QPointF *p = points; p < end; ++p) {
        int side = p->y() < splitY;
        int lastSide = last->y() < splitY;
 
        if (side != lastSide) {
            if (qFuzzyCompare(p->y(), splitY)) {
                bin[!side]->append(*p);
            } else if (qFuzzyCompare(last->y(), splitY)) {
                bin[side]->append(*last);
            } else {
                QPointF delta = *p - *last;
                QPointF intersection(p->x() + delta.x() * (splitY - p->y()) / delta.y(), splitY);
 
                bin[0]->append(intersection);
                bin[1]->append(intersection);
            }
        }
 
        bin[side]->append(*p);
 
        last = p;
    }
 
    // give up if we couldn't reduce the point count
    return upper->size() < pointCount && lower->size() < pointCount;
}
 
/*!
  \internal
 */
void QRasterPaintEngine::fillPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    const int maxPoints = 0xffff;
 
    // max amount of points that raster engine can reliably handle
    if (pointCount > maxPoints) {
        QList<QPointF> upper, lower;
 
        if (splitPolygon(points, pointCount, &upper, &lower)) {
            fillPolygon(upper.constData(), upper.size(), mode);
            fillPolygon(lower.constData(), lower.size(), mode);
        } else
            qWarning("Polygon too complex for filling.");
 
        return;
    }
 
    // Compose polygon fill..,
    QVectorPath vp((const qreal *) points, pointCount, nullptr, QVectorPath::polygonFlags(mode));
    ensureOutlineMapper();
    QT_FT_Outline *outline = d->outlineMapper->convertPath(vp);
 
    // scanconvert.
    ProcessSpans brushBlend = d->getBrushFunc(d->outlineMapper->controlPointRect,
                                              &s->brushData);
    d->rasterize(outline, brushBlend, &s->brushData, d->rasterBuffer.data());
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug(" - QRasterPaintEngine::drawPolygon(F), pointCount=%d", pointCount);
    for (int i=0; i<pointCount; ++i)
        qDebug() << "   - " << points[i];
#endif
    Q_ASSERT(pointCount >= 2);
 
    if (mode != PolylineMode && QVectorPath::isRect((const qreal *) points, pointCount)) {
        QRectF r(points[0], points[2]);
        drawRects(&r, 1);
        return;
    }
 
    ensurePen();
    if (mode != PolylineMode) {
        // Do the fill...
        ensureBrush();
        if (s->brushData.blend)
            fillPolygon(points, pointCount, mode);
    }
 
    // Do the outline...
    if (s->penData.blend) {
        QVectorPath vp((const qreal *) points, pointCount, nullptr, QVectorPath::polygonFlags(mode));
        if (s->flags.fast_pen) {
            QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
            stroker.drawPath(vp);
        } else {
            QPaintEngineEx::stroke(vp, s->lastPen);
        }
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
#ifdef QT_DEBUG_DRAW
    qDebug(" - QRasterPaintEngine::drawPolygon(I), pointCount=%d", pointCount);
    for (int i=0; i<pointCount; ++i)
        qDebug() << "   - " << points[i];
#endif
    Q_ASSERT(pointCount >= 2);
    if (mode != PolylineMode && QVectorPath::isRect((const int *) points, pointCount)) {
        QRect r(points[0].x(),
                points[0].y(),
                points[2].x() - points[0].x(),
                points[2].y() - points[0].y());
        drawRects(&r, 1);
        return;
    }
 
    ensurePen();
 
    // Do the fill
    if (mode != PolylineMode) {
        ensureBrush();
        if (s->brushData.blend) {
            // Compose polygon fill..,
            ensureOutlineMapper();
            d->outlineMapper->beginOutline(mode == WindingMode ? Qt::WindingFill : Qt::OddEvenFill);
            d->outlineMapper->moveTo(*points);
            const QPoint *p = points;
            const QPoint *ep = points + pointCount - 1;
            do {
                d->outlineMapper->lineTo(*(++p));
            } while (p < ep);
            d->outlineMapper->endOutline();
 
            // scanconvert.
            ProcessSpans brushBlend = d->getBrushFunc(d->outlineMapper->controlPointRect,
                                                      &s->brushData);
            d->rasterize(d->outlineMapper->outline(), brushBlend, &s->brushData, d->rasterBuffer.data());
        }
    }
 
    // Do the outline...
    if (s->penData.blend) {
        int count = pointCount * 2;
        QVarLengthArray<qreal> fpoints(count);
        for (int i=0; i<count; ++i)
            fpoints[i] = ((const int *) points)[i];
        QVectorPath vp((qreal *) fpoints.data(), pointCount, nullptr, QVectorPath::polygonFlags(mode));
 
        if (s->flags.fast_pen) {
            QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
            stroker.drawPath(vp);
        } else {
            QPaintEngineEx::stroke(vp, s->lastPen);
        }
    }
}
 
/*!
    \internal
*/
void QRasterPaintEngine::drawPixmap(const QPointF &pos, const QPixmap &pixmap)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawPixmap(), pos=" << pos << " pixmap=" << pixmap.size() << "depth=" << pixmap.depth();
#endif
 
    QPlatformPixmap *pd = pixmap.handle();
    if (pd->classId() == QPlatformPixmap::RasterClass) {
        const QImage &image = static_cast<QRasterPlatformPixmap *>(pd)->image;
        if (image.depth() == 1) {
            Q_D(QRasterPaintEngine);
            QRasterPaintEngineState *s = state();
            if (s->matrix.type() <= QTransform::TxTranslate) {
                ensurePen();
                drawBitmap(pos + QPointF(s->matrix.dx(), s->matrix.dy()), image, &s->penData);
            } else {
                drawImage(pos, d->rasterBuffer->colorizeBitmap(image, s->pen.color()));
            }
        } else {
            QRasterPaintEngine::drawImage(pos, image);
        }
    } else {
        const QImage image = pixmap.toImage();
        if (pixmap.depth() == 1) {
            Q_D(QRasterPaintEngine);
            QRasterPaintEngineState *s = state();
            if (s->matrix.type() <= QTransform::TxTranslate) {
                ensurePen();
                drawBitmap(pos + QPointF(s->matrix.dx(), s->matrix.dy()), image, &s->penData);
            } else {
                drawImage(pos, d->rasterBuffer->colorizeBitmap(image, s->pen.color()));
            }
        } else {
            QRasterPaintEngine::drawImage(pos, image);
        }
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pixmap, const QRectF &sr)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawPixmap(), r=" << r << " sr=" << sr << " pixmap=" << pixmap.size() << "depth=" << pixmap.depth();
#endif
 
    QPlatformPixmap* pd = pixmap.handle();
    if (pd->classId() == QPlatformPixmap::RasterClass) {
        const QImage &image = static_cast<QRasterPlatformPixmap *>(pd)->image;
        if (image.depth() == 1) {
            Q_D(QRasterPaintEngine);
            QRasterPaintEngineState *s = state();
            if (s->matrix.type() <= QTransform::TxTranslate
                && r.size() == sr.size()
                && r.size() == pixmap.size()) {
                ensurePen();
                drawBitmap(r.topLeft() + QPointF(s->matrix.dx(), s->matrix.dy()), image, &s->penData);
                return;
            } else {
                drawImage(r, d->rasterBuffer->colorizeBitmap(image, s->pen.color()), sr);
            }
        } else {
            drawImage(r, image, sr);
        }
    } else {
        QRect clippedSource = sr.toAlignedRect().intersected(pixmap.rect());
        const QImage image = pd->toImage(clippedSource);
        QRectF translatedSource = sr.translated(-clippedSource.topLeft());
        if (image.depth() == 1) {
            Q_D(QRasterPaintEngine);
            QRasterPaintEngineState *s = state();
            if (s->matrix.type() <= QTransform::TxTranslate
                && r.size() == sr.size()
                && r.size() == pixmap.size()) {
                ensurePen();
                drawBitmap(r.topLeft() + QPointF(s->matrix.dx(), s->matrix.dy()), image, &s->penData);
                return;
            } else {
                drawImage(r, d->rasterBuffer->colorizeBitmap(image, s->pen.color()), translatedSource);
            }
        } else {
            drawImage(r, image, translatedSource);
        }
    }
}
 
static inline int fast_ceil_positive(const qreal &v)
{
    const int iv = int(v);
    if (v - iv == 0)
        return iv;
    else
        return iv + 1;
}
 
static inline const QRect toAlignedRect_positive(const QRectF &rect)
{
    const int xmin = int(rect.x());
    const int xmax = int(fast_ceil_positive(rect.right()));
    const int ymin = int(rect.y());
    const int ymax = int(fast_ceil_positive(rect.bottom()));
    return QRect(xmin, ymin, xmax - xmin, ymax - ymin);
}
 
/*!
    \internal
*/
void QRasterPaintEngine::drawImage(const QPointF &p, const QImage &img)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawImage(), p=" <<  p << " image=" << img.size() << "depth=" << img.depth();
#endif
 
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
    qreal scale = img.devicePixelRatio();
 
    if (scale > 1.0 ||  s->matrix.type() > QTransform::TxTranslate) {
        drawImage(QRectF(p.x(), p.y(), img.width() / scale, img.height() / scale),
                  img,
                  QRectF(0, 0, img.width(), img.height()));
    } else {
 
        const QClipData *clip = d->clip();
        QPointF pt(p.x() + s->matrix.dx(), p.y() + s->matrix.dy());
 
        if (d->canUseImageBlitting(d->rasterBuffer->compositionMode, img, pt, img.rect())) {
            if (!clip) {
                d->blitImage(pt, img, d->deviceRect);
                return;
            } else if (clip->hasRectClip) {
                d->blitImage(pt, img, clip->clipRect);
                return;
            }
        } else if (d->canUseFastImageBlending(d->rasterBuffer->compositionMode, img)) {
            SrcOverBlendFunc func = qBlendFunctions[d->rasterBuffer->format][img.format()];
            if (func) {
                if (!clip) {
                    d->drawImage(pt, img, func, d->deviceRect, s->intOpacity);
                    return;
                } else if (clip->hasRectClip) {
                    d->drawImage(pt, img, func, clip->clipRect, s->intOpacity);
                    return;
                }
            }
        }
 
 
 
        d->image_filler.clip = clip;
        d->image_filler.initTexture(&img, s->intOpacity, QTextureData::Plain, img.rect());
        if (!d->image_filler.blend)
            return;
        d->image_filler.dx = -pt.x();
        d->image_filler.dy = -pt.y();
        QRect rr = img.rect().translated(qRound(pt.x()), qRound(pt.y()));
 
        fillRect_normalized(rr, &d->image_filler, d);
    }
 
}
 
QRectF qt_mapRect_non_normalizing(const QRectF &r, const QTransform &t)
{
    return QRectF(r.topLeft() * t, r.bottomRight() * t);
}
 
namespace {
    enum RotationType {
        Rotation90,
        Rotation180,
        Rotation270,
        NoRotation
    };
 
    inline RotationType qRotationType(const QTransform &transform)
    {
        QTransform::TransformationType type = transform.type();
 
        if (type > QTransform::TxRotate)
            return NoRotation;
 
        if (type == QTransform::TxRotate && qFuzzyIsNull(transform.m11()) && qFuzzyCompare(transform.m12(), qreal(-1))
            && qFuzzyCompare(transform.m21(), qreal(1)) && qFuzzyIsNull(transform.m22()))
            return Rotation90;
 
        if (type == QTransform::TxScale && qFuzzyCompare(transform.m11(), qreal(-1)) && qFuzzyIsNull(transform.m12())
            && qFuzzyIsNull(transform.m21()) && qFuzzyCompare(transform.m22(), qreal(-1)))
            return Rotation180;
 
        if (type == QTransform::TxRotate && qFuzzyIsNull(transform.m11()) && qFuzzyCompare(transform.m12(), qreal(1))
            && qFuzzyCompare(transform.m21(), qreal(-1)) && qFuzzyIsNull(transform.m22()))
            return Rotation270;
 
        return NoRotation;
    }
 
    inline bool isPixelAligned(const QPointF &pt)
    {
        return QPointF(pt.toPoint()) == pt;
    }
    inline bool isPixelAligned(const QRectF &rect)
    {
        return QRectF(rect.toRect()) == rect;
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRectF &sr,
                                   Qt::ImageConversionFlags)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawImage(), r=" << r << " sr=" << sr << " image=" << img.size() << "depth=" << img.depth();
#endif
 
    if (r.isEmpty())
        return;
 
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
    Q_ASSERT(s);
    int sr_l = qFloor(sr.left());
    int sr_r = qCeil(sr.right()) - 1;
    int sr_t = qFloor(sr.top());
    int sr_b = qCeil(sr.bottom()) - 1;
 
    if (s->matrix.type() <= QTransform::TxScale && !s->flags.antialiased && sr_l == sr_r && sr_t == sr_b) {
        // as fillRect will apply the aliased coordinate delta we need to
        // subtract it here as we don't use it for image drawing
        QTransform old = s->matrix;
 
        // Do whatever fillRect() does, but without premultiplying the color if it's already premultiplied.
        QRgb color = img.pixel(sr_l, sr_t);
        if (img.pixelFormat().premultiplied() == QPixelFormat::Premultiplied) {
            // Combine premultiplied color with the opacity set on the painter.
            d->solid_color_filler.solidColor = multiplyAlpha256(QRgba64::fromArgb32(color), s->intOpacity);
        } else {
            d->solid_color_filler.solidColor = qPremultiply(combineAlpha256(QRgba64::fromArgb32(color), s->intOpacity));
        }
 
        if (d->solid_color_filler.solidColor.alphaF() <= 0.0f && s->composition_mode == QPainter::CompositionMode_SourceOver)
            return;
 
        d->solid_color_filler.clip = d->clip();
        d->solid_color_filler.adjustSpanMethods();
        fillRect(r, &d->solid_color_filler);
 
        s->matrix = old;
        return;
    }
 
    bool stretch_sr = r.width() != sr.width() || r.height() != sr.height();
 
    const QClipData *clip = d->clip();
 
    if (s->matrix.type() == QTransform::TxRotate
        && !stretch_sr
        && (!clip || clip->hasRectClip)
        && s->intOpacity == 256
        && (d->rasterBuffer->compositionMode == QPainter::CompositionMode_SourceOver
            || d->rasterBuffer->compositionMode == QPainter::CompositionMode_Source))
    {
        RotationType rotationType = qRotationType(s->matrix);
        Q_ASSERT(d->rasterBuffer->format < QImage::NImageFormats);
        const QPixelLayout::BPP plBpp = qPixelLayouts[d->rasterBuffer->format].bpp;
 
        if (rotationType != NoRotation && qMemRotateFunctions[plBpp][rotationType] && img.rect().contains(sr.toAlignedRect())) {
            QRectF transformedTargetRect = s->matrix.mapRect(r);
 
            if (d->canUseImageBlitting(d->rasterBuffer->compositionMode, img, transformedTargetRect.topRight(), sr)) {
                QRect clippedTransformedTargetRect = transformedTargetRect.toRect().intersected(clip ? clip->clipRect : d->deviceRect);
                if (clippedTransformedTargetRect.isNull())
                    return;
 
                QRectF clippedTargetRect = s->matrix.inverted().mapRect(QRectF(clippedTransformedTargetRect));
 
                QRect clippedSourceRect
                    = QRectF(sr.x() + clippedTargetRect.x() - r.x(), sr.y() + clippedTargetRect.y() - r.y(),
                            clippedTargetRect.width(), clippedTargetRect.height()).toRect();
 
                clippedSourceRect = clippedSourceRect.intersected(img.rect());
 
                const qsizetype dbpl = d->rasterBuffer->bytesPerLine();
                const qsizetype sbpl = img.bytesPerLine();
 
                uchar *dst = d->rasterBuffer->buffer();
                uint bpp = img.depth() >> 3;
 
                const uchar *srcBase = img.bits() + clippedSourceRect.y() * sbpl + clippedSourceRect.x() * bpp;
                uchar *dstBase = dst + clippedTransformedTargetRect.y() * dbpl + clippedTransformedTargetRect.x() * bpp;
 
                uint cw = clippedSourceRect.width();
                uint ch = clippedSourceRect.height();
 
                qMemRotateFunctions[plBpp][rotationType](srcBase, cw, ch, sbpl, dstBase, dbpl);
 
                return;
            }
        }
    }
 
    if (s->matrix.type() > QTransform::TxTranslate || stretch_sr) {
 
        QRectF targetBounds = s->matrix.mapRect(r);
        bool exceedsPrecision = r.width() > 0x7fff
                             || r.height() > 0x7fff
                             || targetBounds.left() < -0x7fff
                             || targetBounds.top() < -0x7fff
                             || targetBounds.right() > 0x7fff
                             || targetBounds.bottom() > 0x7fff
                             || targetBounds.width() > 0x7fff
                             || targetBounds.height() > 0x7fff
                             || s->matrix.m11() >= 512
                             || s->matrix.m22() >= 512;
        if (!exceedsPrecision && d->canUseFastImageBlending(d->rasterBuffer->compositionMode, img)) {
            if (s->matrix.type() > QTransform::TxScale) {
                SrcOverTransformFunc func = qTransformFunctions[d->rasterBuffer->format][img.format()];
                // The fast transform methods doesn't really work on small targets, see QTBUG-93475
                // And it can't antialias the edges
                if (func && (!clip || clip->hasRectClip) && !s->flags.antialiased && targetBounds.width() >= 16 && targetBounds.height() >= 16) {
                    func(d->rasterBuffer->buffer(), d->rasterBuffer->bytesPerLine(), img.bits(),
                         img.bytesPerLine(), r, sr, !clip ? d->deviceRect : clip->clipRect,
                         s->matrix, s->intOpacity);
                    return;
                }
            } else {
                // Test for optimized high-dpi case: 2x source on 2x target. (Could be generalized to nX.)
                bool sourceRect2x = r.width() * 2 == sr.width() && r.height() * 2 == sr.height();
                bool scale2x = (s->matrix.m11() == qreal(2)) && (s->matrix.m22() == qreal(2));
                if (s->matrix.type() == QTransform::TxScale && sourceRect2x && scale2x) {
                    SrcOverBlendFunc func = qBlendFunctions[d->rasterBuffer->format][img.format()];
                    if (func) {
                        QPointF pt(r.x() * 2 + s->matrix.dx(), r.y() * 2 + s->matrix.dy());
                        if (!clip) {
                            d->drawImage(pt, img, func, d->deviceRect, s->intOpacity, sr.toRect());
                            return;
                        } else if (clip->hasRectClip) {
                            d->drawImage(pt, img, func, clip->clipRect, s->intOpacity, sr.toRect());
                            return;
                        }
                    }
                }
                SrcOverScaleFunc func = qScaleFunctions[d->rasterBuffer->format][img.format()];
                if (func && (!clip || clip->hasRectClip)) {
                    QRectF tr = qt_mapRect_non_normalizing(r, s->matrix);
                    if (!s->flags.antialiased) {
                        tr.setX(qRound(tr.x()));
                        tr.setY(qRound(tr.y()));
                        tr.setWidth(qRound(tr.width()));
                        tr.setHeight(qRound(tr.height()));
                    }
                    func(d->rasterBuffer->buffer(), d->rasterBuffer->bytesPerLine(),
                         img.bits(), img.bytesPerLine(), img.height(),
                         tr, sr,
                         !clip ? d->deviceRect : clip->clipRect,
                         s->intOpacity);
                    return;
                }
            }
        }
 
        QTransform copy = s->matrix;
        copy.translate(r.x(), r.y());
        if (stretch_sr)
            copy.scale(r.width() / sr.width(), r.height() / sr.height());
        copy.translate(-sr.x(), -sr.y());
 
        d->image_filler_xform.clip = clip;
        d->image_filler_xform.initTexture(&img, s->intOpacity, QTextureData::Plain, toAlignedRect_positive(sr));
        if (!d->image_filler_xform.blend)
            return;
        d->image_filler_xform.setupMatrix(copy, s->flags.bilinear);
 
        if (!s->flags.antialiased && s->matrix.type() == QTransform::TxScale) {
            QRectF rr = s->matrix.mapRect(r);
 
            const int x1 = qRound(rr.x());
            const int y1 = qRound(rr.y());
            const int x2 = qRound(rr.right());
            const int y2 = qRound(rr.bottom());
 
            fillRect_normalized(QRect(x1, y1, x2-x1, y2-y1), &d->image_filler_xform, d);
            return;
        }
 
#ifdef QT_FAST_SPANS
        ensureRasterState();
        if (s->flags.tx_noshear || s->matrix.type() == QTransform::TxScale) {
            d->initializeRasterizer(&d->image_filler_xform);
            d->rasterizer->setAntialiased(s->flags.antialiased);
 
            const QRectF &rect = r.normalized();
            const QPointF a = s->matrix.map((rect.topLeft() + rect.bottomLeft()) * 0.5f);
            const QPointF b = s->matrix.map((rect.topRight() + rect.bottomRight()) * 0.5f);
 
            if (s->flags.tx_noshear)
                d->rasterizer->rasterizeLine(a, b, rect.height() / rect.width());
            else
                d->rasterizer->rasterizeLine(a, b, qAbs((s->matrix.m22() * rect.height()) / (s->matrix.m11() * rect.width())));
            return;
        }
#endif
        QPainterPath path;
        path.addRect(r);
        QTransform m = s->matrix;
        s->matrix = QTransform(m.m11(), m.m12(), m.m13(),
                               m.m21(), m.m22(), m.m23(),
                               m.m31(), m.m32(), m.m33());
        fillPath(path, &d->image_filler_xform);
        s->matrix = m;
    } else {
        QPointF pt(r.x() + s->matrix.dx(), r.y() + s->matrix.dy());
        if (d->canUseImageBlitting(d->rasterBuffer->compositionMode, img, pt, sr)) {
            if (!clip) {
                d->blitImage(pt, img, d->deviceRect, sr.toRect());
                return;
            } else if (clip->hasRectClip) {
                d->blitImage(pt, img, clip->clipRect, sr.toRect());
                return;
            }
        } else if (d->canUseFastImageBlending(d->rasterBuffer->compositionMode, img)) {
            SrcOverBlendFunc func = qBlendFunctions[d->rasterBuffer->format][img.format()];
            if (func) {
                if (!clip) {
                    d->drawImage(pt, img, func, d->deviceRect, s->intOpacity, sr.toRect());
                    return;
                } else if (clip->hasRectClip) {
                    d->drawImage(pt, img, func, clip->clipRect, s->intOpacity, sr.toRect());
                    return;
                }
            }
        }
 
        d->image_filler.clip = clip;
        d->image_filler.initTexture(&img, s->intOpacity, QTextureData::Plain, toAlignedRect_positive(sr));
        if (!d->image_filler.blend)
            return;
        d->image_filler.dx = -(r.x() + s->matrix.dx()) + sr.x();
        d->image_filler.dy = -(r.y() + s->matrix.dy()) + sr.y();
 
        QRectF rr = r;
        rr.translate(s->matrix.dx(), s->matrix.dy());
 
        const int x1 = qRound(rr.x());
        const int y1 = qRound(rr.y());
        const int x2 = qRound(rr.right());
        const int y2 = qRound(rr.bottom());
 
        fillRect_normalized(QRect(x1, y1, x2-x1, y2-y1), &d->image_filler, d);
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &sr)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawTiledPixmap(), r=" << r << "pixmap=" << pixmap.size();
#endif
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
    Q_ASSERT(s);
 
    QImage image;
 
    QPlatformPixmap *pd = pixmap.handle();
    if (pd->classId() == QPlatformPixmap::RasterClass) {
        image = static_cast<QRasterPlatformPixmap *>(pd)->image;
    } else {
        image = pixmap.toImage();
    }
 
    if (image.depth() == 1)
        image = d->rasterBuffer->colorizeBitmap(image, s->pen.color());
 
    const qreal pixmapDevicePixelRatio = pixmap.devicePixelRatio();
    if (s->matrix.type() > QTransform::TxTranslate || pixmapDevicePixelRatio > qreal(1.0)) {
        QTransform copy = s->matrix;
        copy.translate(r.x(), r.y());
        copy.translate(-sr.x(), -sr.y());
        const qreal inverseDpr = qreal(1.0) / pixmapDevicePixelRatio;
        copy.scale(inverseDpr, inverseDpr);
        d->image_filler_xform.clip = d->clip();
        d->image_filler_xform.initTexture(&image, s->intOpacity, QTextureData::Tiled);
        if (!d->image_filler_xform.blend)
            return;
        d->image_filler_xform.setupMatrix(copy, s->flags.bilinear);
 
#ifdef QT_FAST_SPANS
        ensureRasterState();
        if (s->flags.tx_noshear || s->matrix.type() == QTransform::TxScale) {
            d->initializeRasterizer(&d->image_filler_xform);
            d->rasterizer->setAntialiased(s->flags.antialiased);
 
            const QRectF &rect = r.normalized();
            const QPointF a = s->matrix.map((rect.topLeft() + rect.bottomLeft()) * 0.5f);
            const QPointF b = s->matrix.map((rect.topRight() + rect.bottomRight()) * 0.5f);
            if (s->flags.tx_noshear)
                d->rasterizer->rasterizeLine(a, b, rect.height() / rect.width());
            else
                d->rasterizer->rasterizeLine(a, b, qAbs((s->matrix.m22() * rect.height()) / (s->matrix.m11() * rect.width())));
            return;
        }
#endif
        QPainterPath path;
        path.addRect(r);
        fillPath(path, &d->image_filler_xform);
    } else {
        d->image_filler.clip = d->clip();
 
        d->image_filler.initTexture(&image, s->intOpacity, QTextureData::Tiled);
        if (!d->image_filler.blend)
            return;
        d->image_filler.dx = -(r.x() + s->matrix.dx()) + sr.x();
        d->image_filler.dy = -(r.y() + s->matrix.dy()) + sr.y();
 
        QRectF rr = r;
        rr.translate(s->matrix.dx(), s->matrix.dy());
        fillRect_normalized(rr.normalized().toRect(), &d->image_filler, d);
    }
}
 
 
//QWS hack
static inline bool monoVal(const uchar* s, int x)
{
    return  (s[x>>3] << (x&7)) & 0x80;
}
 
/*!
    \internal
 */
QRasterBuffer *QRasterPaintEngine::rasterBuffer()
{
    Q_D(QRasterPaintEngine);
    return d->rasterBuffer.data();
}
 
/*!
    \internal
*/
void QRasterPaintEngine::alphaPenBlt(const void* src, int bpl, int depth, int rx,int ry,int w,int h, bool useGammaCorrection)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    if (!s->penData.blend)
        return;
 
    QRasterBuffer *rb = d->rasterBuffer.data();
    if (rb->colorSpace.transferFunction() == QColorSpace::TransferFunction::Linear)
        useGammaCorrection = false;
 
    const QRect rect(rx, ry, w, h);
    const QClipData *clip = d->clip();
    bool unclipped = false;
    if (clip) {
        // inlined QRect::intersects
        const bool intersects = qMax(clip->xmin, rect.left()) <= qMin(clip->xmax - 1, rect.right())
                                && qMax(clip->ymin, rect.top()) <= qMin(clip->ymax - 1, rect.bottom());
 
        if (clip->hasRectClip) {
            unclipped = rx > clip->xmin
                        && rx + w < clip->xmax
                        && ry > clip->ymin
                        && ry + h < clip->ymax;
        }
 
        if (!intersects)
            return;
    } else {
        // inlined QRect::intersects
        const bool intersects = qMax(0, rect.left()) <= qMin(rb->width() - 1, rect.right())
                                && qMax(0, rect.top()) <= qMin(rb->height() - 1, rect.bottom());
        if (!intersects)
            return;
 
        // inlined QRect::contains
        const bool contains = rect.left() >= 0 && rect.right() < rb->width()
                              && rect.top() >= 0 && rect.bottom() < rb->height();
 
        unclipped = contains && d->isUnclipped_normalized(rect);
    }
 
    ProcessSpans blend = unclipped ? s->penData.unclipped_blend : s->penData.blend;
    const uchar * scanline = static_cast<const uchar *>(src);
 
    if (s->flags.fast_text) {
        if (unclipped) {
            if (depth == 1) {
                if (s->penData.bitmapBlit) {
                    s->penData.bitmapBlit(rb, rx, ry, s->penData.solidColor.rgba64(),
                                          scanline, w, h, bpl);
                    return;
                }
            } else if (depth == 8) {
                if (s->penData.alphamapBlit) {
                    s->penData.alphamapBlit(rb, rx, ry, s->penData.solidColor.rgba64(),
                                            scanline, w, h, bpl, nullptr, useGammaCorrection);
                    return;
                }
            } else if (depth == 32) {
                // (A)RGB Alpha mask where the alpha component is not used.
                if (s->penData.alphaRGBBlit) {
                    s->penData.alphaRGBBlit(rb, rx, ry, s->penData.solidColor.rgba64(),
                                            (const uint *) scanline, w, h, bpl / 4, nullptr, useGammaCorrection);
                    return;
                }
            }
        } else if ((depth == 8 && s->penData.alphamapBlit) || (depth == 32 && s->penData.alphaRGBBlit)) {
            // (A)RGB Alpha mask where the alpha component is not used.
            if (!clip) {
                int nx = qMax(0, rx);
                int ny = qMax(0, ry);
 
                // Move scanline pointer to compensate for moved x and y
                int xdiff = nx - rx;
                int ydiff = ny - ry;
                scanline += ydiff * bpl;
                scanline += xdiff * (depth == 32 ? 4 : 1);
 
                w -= xdiff;
                h -= ydiff;
 
                if (nx + w > d->rasterBuffer->width())
                    w = d->rasterBuffer->width() - nx;
                if (ny + h > d->rasterBuffer->height())
                    h = d->rasterBuffer->height() - ny;
 
                rx = nx;
                ry = ny;
            }
            if (depth == 8)
                s->penData.alphamapBlit(rb, rx, ry, s->penData.solidColor.rgba64(),
                                        scanline, w, h, bpl, clip, useGammaCorrection);
            else if (depth == 32)
                s->penData.alphaRGBBlit(rb, rx, ry, s->penData.solidColor.rgba64(),
                                        (const uint *) scanline, w, h, bpl / 4, clip, useGammaCorrection);
            return;
        }
    }
 
    int x0 = 0;
    if (rx < 0) {
        x0 = -rx;
        w -= x0;
    }
 
    int y0 = 0;
    if (ry < 0) {
        y0 = -ry;
        scanline += bpl * y0;
        h -= y0;
    }
 
    w = qMin(w, rb->width() - qMax(0, rx));
    h = qMin(h, rb->height() - qMax(0, ry));
 
    if (w <= 0 || h <= 0)
        return;
 
    const int NSPANS = 512;
    QT_FT_Span spans[NSPANS];
    int current = 0;
 
    const int x1 = x0 + w;
    const int y1 = y0 + h;
 
    if (depth == 1) {
        for (int y = y0; y < y1; ++y) {
            for (int x = x0; x < x1; ) {
                if (!monoVal(scanline, x)) {
                    ++x;
                    continue;
                }
 
                if (current == NSPANS) {
                    blend(current, spans, &s->penData);
                    current = 0;
                }
                spans[current].x = x + rx;
                spans[current].y = y + ry;
                spans[current].coverage = 255;
                int len = 1;
                ++x;
                // extend span until we find a different one.
                while (x < x1 && monoVal(scanline, x)) {
                    ++x;
                    ++len;
                }
                spans[current].len = len;
                ++current;
            }
            scanline += bpl;
        }
    } else if (depth == 8) {
        for (int y = y0; y < y1; ++y) {
            for (int x = x0; x < x1; ) {
                // Skip those with 0 coverage
                if (scanline[x] == 0) {
                    ++x;
                    continue;
                }
 
                if (current == NSPANS) {
                    blend(current, spans, &s->penData);
                    current = 0;
                }
                int coverage = scanline[x];
                spans[current].x = x + rx;
                spans[current].y = y + ry;
                spans[current].coverage = coverage;
                int len = 1;
                ++x;
 
                // extend span until we find a different one.
                while (x < x1 && scanline[x] == coverage) {
                    ++x;
                    ++len;
                }
                spans[current].len = len;
                ++current;
            }
            scanline += bpl;
        }
    } else { // 32-bit alpha...
        const uint *sl = (const uint *) scanline;
        for (int y = y0; y < y1; ++y) {
            for (int x = x0; x < x1; ) {
                // Skip those with 0 coverage
                if ((sl[x] & 0x00ffffff) == 0) {
                    ++x;
                    continue;
                }
 
                if (current == NSPANS) {
                    blend(current, spans, &s->penData);
                    current = 0;
                }
                uint rgbCoverage = sl[x];
                int coverage = qGreen(rgbCoverage);
                spans[current].x = x + rx;
                spans[current].y = y + ry;
                spans[current].coverage = coverage;
                int len = 1;
                ++x;
 
                // extend span until we find a different one.
                while (x < x1 && sl[x] == rgbCoverage) {
                    ++x;
                    ++len;
                }
                spans[current].len = len;
                ++current;
            }
            sl += bpl / sizeof(uint);
        }
    }
//     qDebug() << "alphaPenBlt: num spans=" << current
//              << "span:" << spans->x << spans->y << spans->len << spans->coverage;
        // Call span func for current set of spans.
    if (current != 0)
        blend(current, spans, &s->penData);
}
 
/*!
    \internal
*/
bool QRasterPaintEngine::drawCachedGlyphs(int numGlyphs, const glyph_t *glyphs,
                                          const QFixedPoint *positions, QFontEngine *fontEngine)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    bool verticalSubPixelPositions = fontEngine->supportsVerticalSubPixelPositions()
            && (s->renderHints & QPainter::VerticalSubpixelPositioning) != 0;
 
    if (fontEngine->hasInternalCaching()) {
        QFontEngine::GlyphFormat neededFormat =
            painter()->device()->devType() == QInternal::Widget
            ? QFontEngine::Format_None
            : QFontEngine::Format_A8;
 
        if (d_func()->mono_surface) // alphaPenBlt can handle mono, too
            neededFormat = QFontEngine::Format_Mono;
 
        for (int i = 0; i < numGlyphs; i++) {
            QFixedPoint spp = fontEngine->subPixelPositionFor(positions[i]);
            if (!verticalSubPixelPositions)
                spp.y = 0;
 
            const QFontEngine::Glyph *alphaMap = fontEngine->glyphData(glyphs[i], spp, neededFormat, s->matrix);
            if (!alphaMap)
                continue;
 
            int depth;
            int bytesPerLine;
            switch (alphaMap->format) {
            case QFontEngine::Format_Mono:
                depth = 1;
                bytesPerLine = ((alphaMap->width + 31) & ~31) >> 3;
                break;
            case QFontEngine::Format_A8:
                depth = 8;
                bytesPerLine = (alphaMap->width + 3) & ~3;
                break;
            case QFontEngine::Format_A32:
                depth = 32;
                bytesPerLine = alphaMap->width * 4;
                break;
            default:
                Q_UNREACHABLE();
            };
 
            QFixed y = verticalSubPixelPositions
                    ? qFloor(positions[i].y)
                    : qRound(positions[i].y);
 
            alphaPenBlt(alphaMap->data, bytesPerLine, depth,
                        qFloor(positions[i].x) + alphaMap->x,
                        qFloor(y) - alphaMap->y,
                        alphaMap->width, alphaMap->height,
                        fontEngine->expectsGammaCorrectedBlending());
        }
 
    } else {
        QFontEngine::GlyphFormat glyphFormat = fontEngine->glyphFormat != QFontEngine::Format_None ? fontEngine->glyphFormat : d->glyphCacheFormat;
 
        QImageTextureGlyphCache *cache =
            static_cast<QImageTextureGlyphCache *>(fontEngine->glyphCache(nullptr, glyphFormat, s->matrix, s->penData.solidColor));
        if (!cache) {
            cache = new QImageTextureGlyphCache(glyphFormat, s->matrix, s->penData.solidColor);
            fontEngine->setGlyphCache(nullptr, cache);
        }
 
        cache->populate(fontEngine, numGlyphs, glyphs, positions, s->renderHints);
        cache->fillInPendingGlyphs();
 
        const QImage &image = cache->image();
        qsizetype bpl = image.bytesPerLine();
 
        int depth = image.depth();
        int rightShift = 0;
        int leftShift = 0;
        if (depth == 32)
            leftShift = 2; // multiply by 4
        else if (depth == 1)
            rightShift = 3; // divide by 8
 
        int margin = fontEngine->glyphMargin(glyphFormat);
        const uchar *bits = image.bits();
        for (int i=0; i<numGlyphs; ++i) {
            QFixedPoint subPixelPosition = fontEngine->subPixelPositionFor(positions[i]);
            if (!verticalSubPixelPositions)
                subPixelPosition.y = 0;
 
            QTextureGlyphCache::GlyphAndSubPixelPosition glyph(glyphs[i], subPixelPosition);
            const QTextureGlyphCache::Coord &c = cache->coords[glyph];
            if (c.isNull())
                continue;
 
            int x = qFloor(positions[i].x) + c.baseLineX - margin;
            int y = (verticalSubPixelPositions
                        ? qFloor(positions[i].y)
                        : qRound(positions[i].y));
            y -= c.baseLineY + margin;
 
            // printf("drawing [%d %d %d %d] baseline [%d %d], glyph: %d, to: %d %d, pos: %d %d\n",
            //        c.x, c.y,
            //        c.w, c.h,
            //        c.baseLineX, c.baseLineY,
            //        glyphs[i],
            //        x, y,
            //        positions[i].x.toInt(), positions[i].y.toInt());
 
            const uchar *glyphBits = bits + ((c.x << leftShift) >> rightShift) + c.y * bpl;
 
            if (glyphFormat == QFontEngine::Format_ARGB) {
                // The current state transform has already been applied to the positions,
                // so we prevent drawImage() from re-applying the transform by clearing
                // the state for the duration of the call.
                QTransform originalTransform = s->matrix;
                s->matrix = QTransform();
                drawImage(QPoint(x, y), QImage(glyphBits, c.w, c.h, bpl, image.format()));
                s->matrix = originalTransform;
            } else {
                alphaPenBlt(glyphBits, bpl, depth, x, y, c.w, c.h, fontEngine->expectsGammaCorrectedBlending());
            }
        }
    }
    return true;
}
 
 
/*!
 * \internal
 * Returns \c true if the rectangle is completely within the current clip
 * state of the paint engine.
 */
bool QRasterPaintEnginePrivate::isUnclipped_normalized(const QRect &r) const
{
    const QClipData *cl = clip();
    if (!cl) {
        // inline contains() for performance (we know the rects are normalized)
        const QRect &r1 = deviceRect;
        return (r.left() >= r1.left() && r.right() <= r1.right()
                && r.top() >= r1.top() && r.bottom() <= r1.bottom());
    }
 
 
    if (cl->hasRectClip) {
        // currently all painting functions clips to deviceRect internally
        if (cl->clipRect == deviceRect)
            return true;
 
        // inline contains() for performance (we know the rects are normalized)
        const QRect &r1 = cl->clipRect;
        return (r.left() >= r1.left() && r.right() <= r1.right()
                && r.top() >= r1.top() && r.bottom() <= r1.bottom());
    } else {
        return qt_region_strictContains(cl->clipRegion, r);
    }
}
 
bool QRasterPaintEnginePrivate::isUnclipped(const QRect &rect,
                                            int penWidth) const
{
    Q_Q(const QRasterPaintEngine);
    const QRasterPaintEngineState *s = q->state();
    const QClipData *cl = clip();
    QRect r = rect.normalized();
    if (!cl) {
        // inline contains() for performance (we know the rects are normalized)
        const QRect &r1 = deviceRect;
        return (r.left() >= r1.left() && r.right() <= r1.right()
                && r.top() >= r1.top() && r.bottom() <= r1.bottom());
    }
 
 
    // currently all painting functions that call this function clip to deviceRect internally
    if (cl->hasRectClip && cl->clipRect == deviceRect)
        return true;
 
    if (s->flags.antialiased)
        ++penWidth;
 
    if (penWidth > 0) {
        r.setX(r.x() - penWidth);
        r.setY(r.y() - penWidth);
        r.setWidth(r.width() + 2 * penWidth);
        r.setHeight(r.height() + 2 * penWidth);
    }
 
    if (cl->hasRectClip) {
        // inline contains() for performance (we know the rects are normalized)
        const QRect &r1 = cl->clipRect;
        return (r.left() >= r1.left() && r.right() <= r1.right()
                && r.top() >= r1.top() && r.bottom() <= r1.bottom());
    } else {
        return qt_region_strictContains(cl->clipRegion, r);
    }
}
 
inline bool QRasterPaintEnginePrivate::isUnclipped(const QRectF &rect,
                                                   int penWidth) const
{
    const QRectF norm = rect.normalized();
    if (norm.left() <= qreal(INT_MIN) || norm.top() <= qreal(INT_MIN)
            || norm.right() > qreal(INT_MAX) || norm.bottom() > qreal(INT_MAX)
            || norm.width() > qreal(INT_MAX) || norm.height() > qreal(INT_MAX))
        return false;
    return isUnclipped(norm.toAlignedRect(), penWidth);
}
 
inline ProcessSpans
QRasterPaintEnginePrivate::getBrushFunc(const QRect &rect,
                                        const QSpanData *data) const
{
    return isUnclipped(rect, 0) ? data->unclipped_blend : data->blend;
}
 
inline ProcessSpans
QRasterPaintEnginePrivate::getBrushFunc(const QRectF &rect,
                                        const QSpanData *data) const
{
    return isUnclipped(rect, 0) ? data->unclipped_blend : data->blend;
}
 
inline ProcessSpans
QRasterPaintEnginePrivate::getPenFunc(const QRectF &rect,
                                      const QSpanData *data) const
{
    Q_Q(const QRasterPaintEngine);
    const QRasterPaintEngineState *s = q->state();
 
    if (!s->flags.fast_pen && s->matrix.type() > QTransform::TxTranslate)
        return data->blend;
    const int penWidth = s->flags.fast_pen ? 1 : qCeil(s->lastPen.widthF());
    return isUnclipped(rect, penWidth) ? data->unclipped_blend : data->blend;
}
 
struct VisibleGlyphRange
{
    int begin;
    int end;
};
 
static VisibleGlyphRange visibleGlyphRange(const QRectF &clip, QFontEngine *fontEngine,
                                           glyph_t *glyphs, QFixedPoint *positions, int numGlyphs)
{
    QFixed clipLeft = QFixed::fromReal(clip.left() - 1);
    QFixed clipRight = QFixed::fromReal(clip.right() + 1);
    QFixed clipTop = QFixed::fromReal(clip.top() - 1);
    QFixed clipBottom = QFixed::fromReal(clip.bottom() + 1);
 
    int first = 0;
    while (first < numGlyphs) {
        glyph_metrics_t metrics = fontEngine->boundingBox(glyphs[first]);
        QFixed left = metrics.x + positions[first].x;
        QFixed top = metrics.y + positions[first].y;
        QFixed right = left + metrics.width;
        QFixed bottom = top + metrics.height;
        if (left < clipRight && right > clipLeft && top < clipBottom && bottom > clipTop)
            break;
        ++first;
    }
    int last = numGlyphs - 1;
    while (last > first) {
        glyph_metrics_t metrics = fontEngine->boundingBox(glyphs[last]);
        QFixed left = metrics.x + positions[last].x;
        QFixed top = metrics.y + positions[last].y;
        QFixed right = left + metrics.width;
        QFixed bottom = top + metrics.height;
        if (left < clipRight && right > clipLeft && top < clipBottom && bottom > clipTop)
            break;
        --last;
    }
    return {first, last + 1};
}
 
/*!
   \reimp
*/
void QRasterPaintEngine::drawStaticTextItem(QStaticTextItem *textItem)
{
    if (textItem->numGlyphs == 0)
        return;
 
    ensurePen();
    ensureRasterState();
 
    QTransform matrix = state()->matrix;
 
    QFontEngine *fontEngine = textItem->fontEngine();
    if (shouldDrawCachedGlyphs(fontEngine, matrix)) {
        drawCachedGlyphs(textItem->numGlyphs, textItem->glyphs, textItem->glyphPositions,
                         fontEngine);
    } else if (matrix.type() < QTransform::TxProject) {
        bool invertible;
        QTransform invMat = matrix.inverted(&invertible);
        if (!invertible)
            return;
 
        const auto range = visibleGlyphRange(invMat.mapRect(clipBoundingRect()),
                                             textItem->fontEngine(), textItem->glyphs,
                                             textItem->glyphPositions, textItem->numGlyphs);
        QStaticTextItem copy = *textItem;
        copy.glyphs += range.begin;
        copy.glyphPositions += range.begin;
        copy.numGlyphs = range.end - range.begin;
        QPaintEngineEx::drawStaticTextItem(&copy);
    } else {
        QPaintEngineEx::drawStaticTextItem(textItem);
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem)
{
    const QTextItemInt &ti = static_cast<const QTextItemInt &>(textItem);
 
#ifdef QT_DEBUG_DRAW
    Q_D(QRasterPaintEngine);
    fprintf(stderr," - QRasterPaintEngine::drawTextItem(), (%.2f,%.2f), string=%s ct=%d\n",
           p.x(), p.y(), QStringView(ti.chars, ti.num_chars).toLatin1().data(),
           d->glyphCacheFormat);
#endif
 
    if (ti.glyphs.numGlyphs == 0)
        return;
    ensurePen();
    ensureRasterState();
 
    QRasterPaintEngineState *s = state();
    QTransform matrix = s->matrix;
 
    if (shouldDrawCachedGlyphs(ti.fontEngine, matrix)) {
        QVarLengthArray<QFixedPoint> positions;
        QVarLengthArray<glyph_t> glyphs;
 
        matrix.translate(p.x(), p.y());
        ti.fontEngine->getGlyphPositions(ti.glyphs, matrix, ti.flags, glyphs, positions);
 
        drawCachedGlyphs(glyphs.size(), glyphs.constData(), positions.constData(), ti.fontEngine);
    } else if (matrix.type() < QTransform::TxProject
               && ti.fontEngine->supportsTransformation(matrix)) {
        bool invertible;
        QTransform invMat = matrix.inverted(&invertible);
        if (!invertible)
            return;
 
        QVarLengthArray<QFixedPoint> positions;
        QVarLengthArray<glyph_t> glyphs;
 
        ti.fontEngine->getGlyphPositions(ti.glyphs, QTransform::fromTranslate(p.x(), p.y()),
                                         ti.flags, glyphs, positions);
        const auto range = visibleGlyphRange(invMat.mapRect(clipBoundingRect()),
                                             ti.fontEngine, glyphs.data(), positions.data(),
                                             glyphs.size());
 
        if (range.begin >= range.end)
            return;
 
        QStaticTextItem staticTextItem;
        staticTextItem.color = s->pen.color();
        staticTextItem.font = s->font;
        staticTextItem.setFontEngine(ti.fontEngine);
        staticTextItem.numGlyphs = range.end - range.begin;
        staticTextItem.glyphs = glyphs.data() + range.begin;
        staticTextItem.glyphPositions = positions.data() + range.begin;
        QPaintEngineEx::drawStaticTextItem(&staticTextItem);
    } else {
        QPaintEngineEx::drawTextItem(p, ti);
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawPoints(const QPointF *points, int pointCount)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen();
    if (!s->penData.blend)
        return;
 
    if (!s->flags.fast_pen) {
        QPaintEngineEx::drawPoints(points, pointCount);
        return;
    }
 
    QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
    stroker.drawPoints(points, pointCount);
}
 
 
void QRasterPaintEngine::drawPoints(const QPoint *points, int pointCount)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen();
    if (!s->penData.blend)
        return;
 
    if (!s->flags.fast_pen) {
        QPaintEngineEx::drawPoints(points, pointCount);
        return;
    }
 
    QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
    stroker.drawPoints(points, pointCount);
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawLines(const QLine *lines, int lineCount)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawLines(QLine*)" << lineCount;
#endif
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen();
    if (!s->penData.blend)
        return;
 
    if (s->flags.fast_pen) {
        QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
        for (int i=0; i<lineCount; ++i) {
            const QLine &l = lines[i];
            stroker.drawLine(l.p1(), l.p2());
        }
    } else {
        QPaintEngineEx::drawLines(lines, lineCount);
    }
}
 
void QRasterPaintEnginePrivate::rasterizeLine_dashed(QLineF line,
                                                     qreal width,
                                                     int *dashIndex,
                                                     qreal *dashOffset,
                                                     bool *inDash)
{
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    const QPen &pen = s->lastPen;
    const bool squareCap = (pen.capStyle() == Qt::SquareCap);
    const QList<qreal> pattern = pen.dashPattern();
 
    qreal patternLength = 0;
    for (int i = 0; i < pattern.size(); ++i)
        patternLength += pattern.at(i);
 
    if (patternLength <= 0)
        return;
 
    qreal length = line.length();
    Q_ASSERT(length > 0);
    if (length / (patternLength * width) > QDashStroker::repetitionLimit()) {
        rasterizer->rasterizeLine(line.p1(), line.p2(), width / length, squareCap);
        return;
    }
 
    while (length > 0) {
        const bool rasterize = *inDash;
        qreal dash = (pattern.at(*dashIndex) - *dashOffset) * width;
        QLineF l = line;
 
        if (dash >= length) {
            dash = line.length();  // Avoid accumulated precision error in 'length'
            *dashOffset += dash / width;
            length = 0;
        } else {
            *dashOffset = 0;
            *inDash = !(*inDash);
            if (++*dashIndex >= pattern.size())
                *dashIndex = 0;
            length -= dash;
            l.setLength(dash);
            line.setP1(l.p2());
        }
 
        if (rasterize && dash > 0)
            rasterizer->rasterizeLine(l.p1(), l.p2(), width / dash, squareCap);
    }
}
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawLines(const QLineF *lines, int lineCount)
{
#ifdef QT_DEBUG_DRAW
    qDebug() << " - QRasterPaintEngine::drawLines(QLineF *)" << lineCount;
#endif
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen();
    if (!s->penData.blend)
        return;
    if (s->flags.fast_pen) {
        QCosmeticStroker stroker(s, d->deviceRect, d->deviceRectUnclipped);
        for (int i=0; i<lineCount; ++i) {
            QLineF line = lines[i];
            stroker.drawLine(line.p1(), line.p2());
        }
    } else {
        QPaintEngineEx::drawLines(lines, lineCount);
    }
}
 
 
/*!
    \reimp
*/
void QRasterPaintEngine::drawEllipse(const QRectF &rect)
{
    Q_D(QRasterPaintEngine);
    QRasterPaintEngineState *s = state();
 
    ensurePen();
    if (((qpen_style(s->lastPen) == Qt::SolidLine && s->flags.fast_pen)
           || (qpen_style(s->lastPen) == Qt::NoPen))
        && !s->flags.antialiased
        && qMax(rect.width(), rect.height()) < QT_RASTER_COORD_LIMIT
        && !rect.isEmpty()
        && s->matrix.type() <= QTransform::TxScale) // no shear
    {
        ensureBrush();
        const QRectF r = s->matrix.mapRect(rect);
        ProcessSpans penBlend = d->getPenFunc(r, &s->penData);
        ProcessSpans brushBlend = d->getBrushFunc(r, &s->brushData);
        const QRect brect = QRect(int(r.x()), int(r.y()),
                                  int_dim(r.x(), r.width()),
                                  int_dim(r.y(), r.height()));
        if (brect == r) {
            drawEllipse_midpoint_i(brect, d->deviceRect, penBlend, brushBlend,
                                   &s->penData, &s->brushData);
            return;
        }
    }
    QPaintEngineEx::drawEllipse(rect);
}
 
 
#ifdef Q_OS_WIN
/*!
    \internal
*/
void QRasterPaintEngine::setDC(HDC hdc) {
    Q_D(QRasterPaintEngine);
    d->hdc = hdc;
}
 
/*!
    \internal
*/
HDC QRasterPaintEngine::getDC() const
{
    Q_D(const QRasterPaintEngine);
    return d->hdc;
}
 
/*!
    \internal
*/
void QRasterPaintEngine::releaseDC(HDC) const
{
}
 
#endif
 
/*!
    \internal
*/
bool QRasterPaintEngine::requiresPretransformedGlyphPositions(QFontEngine *fontEngine, const QTransform &m) const
{
    // Cached glyphs always require pretransformed positions
    if (shouldDrawCachedGlyphs(fontEngine, m))
        return true;
 
    // Otherwise let the base-class decide based on the transform
    return QPaintEngineEx::requiresPretransformedGlyphPositions(fontEngine, m);
}
 
/*!
   Returns whether glyph caching is supported by the font engine
   \a fontEngine with the given transform \a m applied.
*/
bool QRasterPaintEngine::shouldDrawCachedGlyphs(QFontEngine *fontEngine, const QTransform &m) const
{
    // The raster engine does not support projected cached glyph drawing
    if (m.type() >= QTransform::TxProject)
        return false;
 
    // The font engine might not support filling the glyph cache
    // with the given transform applied, in which case we need to
    // fall back to the QPainterPath code-path. This does not apply
    // for engines with internal caching, as we don't use the engine
    // to fill up our cache in that case.
    if (!fontEngine->hasInternalCaching() && !fontEngine->supportsTransformation(m))
        return false;
 
    if (fontEngine->supportsTransformation(m) && !fontEngine->isSmoothlyScalable)
        return true;
 
    return QPaintEngineEx::shouldDrawCachedGlyphs(fontEngine, m);
}
 
/*!
    \internal
*/
QPoint QRasterPaintEngine::coordinateOffset() const
{
    return QPoint(0, 0);
}
 
void QRasterPaintEngine::drawBitmap(const QPointF &pos, const QImage &image, QSpanData *fg)
{
    Q_ASSERT(fg);
    if (!fg->blend)
        return;
    Q_D(QRasterPaintEngine);
 
    Q_ASSERT(image.depth() == 1);
 
    const int spanCount = 512;
    QT_FT_Span spans[spanCount];
    int n = 0;
 
    // Boundaries
    int w = image.width();
    int h = image.height();
    int px = qRound(pos.x());
    int py = qRound(pos.y());
    int ymax = qMin(py + h, d->rasterBuffer->height());
    int ymin = qMax(py, 0);
    int xmax = qMin(px + w, d->rasterBuffer->width());
    int xmin = qMax(px, 0);
 
    int x_offset = xmin - px;
 
    QImage::Format format = image.format();
    for (int y = ymin; y < ymax; ++y) {
        const uchar *src = image.scanLine(y - py);
        if (format == QImage::Format_MonoLSB) {
            for (int x = 0; x < xmax - xmin; ++x) {
                int src_x = x + x_offset;
                uchar pixel = src[src_x >> 3];
                if (!pixel) {
                    x += 7 - (src_x%8);
                    continue;
                }
                if (pixel & (0x1 << (src_x & 7))) {
                    spans[n].x = xmin + x;
                    spans[n].y = y;
                    spans[n].coverage = 255;
                    int len = 1;
                    while (src_x+1 < w && src[(src_x+1) >> 3] & (0x1 << ((src_x+1) & 7))) {
                        ++src_x;
                        ++len;
                    }
                    spans[n].len = ((len + spans[n].x) > xmax) ? (xmax - spans[n].x) : len;
                    x += len;
                    ++n;
                    if (n == spanCount) {
                        fg->blend(n, spans, fg);
                        n = 0;
                    }
                }
            }
        } else {
            for (int x = 0; x < xmax - xmin; ++x) {
                int src_x = x + x_offset;
                uchar pixel = src[src_x >> 3];
                if (!pixel) {
                    x += 7 - (src_x%8);
                    continue;
                }
                if (pixel & (0x80 >> (x & 7))) {
                    spans[n].x = xmin + x;
                    spans[n].y = y;
                    spans[n].coverage = 255;
                    int len = 1;
                    while (src_x+1 < w && src[(src_x+1) >> 3] & (0x80 >> ((src_x+1) & 7))) {
                        ++src_x;
                        ++len;
                    }
                    spans[n].len = ((len + spans[n].x) > xmax) ? (xmax - spans[n].x) : len;
                    x += len;
                    ++n;
                    if (n == spanCount) {
                        fg->blend(n, spans, fg);
                        n = 0;
                    }
                }
            }
        }
    }
    if (n) {
        fg->blend(n, spans, fg);
        n = 0;
    }
}
 
/*!
    \enum QRasterPaintEngine::ClipType
    \internal
 
    \value RectClip Indicates that the currently set clip is a single rectangle.
    \value ComplexClip Indicates that the currently set clip is a combination of several shapes.
*/
 
/*!
    \internal
    Returns the type of the clip currently set.
*/
QRasterPaintEngine::ClipType QRasterPaintEngine::clipType() const
{
    Q_D(const QRasterPaintEngine);
 
    const QClipData *clip = d->clip();
    if (!clip || clip->hasRectClip)
        return RectClip;
    else
        return ComplexClip;
}
 
/*!
    \internal
    Returns the bounding rect of the currently set clip.
*/
QRectF QRasterPaintEngine::clipBoundingRect() const
{
    Q_D(const QRasterPaintEngine);
 
    const QClipData *clip = d->clip();
 
    if (!clip)
        return d->deviceRect;
 
    if (clip->hasRectClip)
        return clip->clipRect;
 
    return QRectF(clip->xmin, clip->ymin, clip->xmax - clip->xmin, clip->ymax - clip->ymin);
}
 
void QRasterPaintEnginePrivate::initializeRasterizer(QSpanData *data)
{
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    rasterizer->setAntialiased(s->flags.antialiased);
 
    QRect clipRect(deviceRect);
    ProcessSpans blend;
    // ### get from optimized rectbased QClipData
 
    const QClipData *c = clip();
    if (c) {
        const QRect r(QPoint(c->xmin, c->ymin),
                      QSize(c->xmax - c->xmin, c->ymax - c->ymin));
        clipRect = clipRect.intersected(r);
        blend = data->blend;
    } else {
        blend = data->unclipped_blend;
    }
 
    rasterizer->setClipRect(clipRect);
    rasterizer->initialize(blend, data);
}
 
void QRasterPaintEnginePrivate::rasterize(QT_FT_Outline *outline,
                                          ProcessSpans callback,
                                          QSpanData *spanData, QRasterBuffer *rasterBuffer)
{
    if (!callback || !outline)
        return;
 
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    if (!s->flags.antialiased) {
        initializeRasterizer(spanData);
 
        const Qt::FillRule fillRule = outline->flags == QT_FT_OUTLINE_NONE
                                      ? Qt::WindingFill
                                      : Qt::OddEvenFill;
 
        rasterizer->rasterize(outline, fillRule);
        return;
    }
 
    rasterize(outline, callback, (void *)spanData, rasterBuffer);
}
 
extern "C" {
int QT_MANGLE_NAMESPACE(q_gray_rendered_spans)(QT_FT_Raster raster);
}
 
static inline uchar *alignAddress(uchar *address, quintptr alignmentMask)
{
    return (uchar *)(((quintptr)address + alignmentMask) & ~alignmentMask);
}
 
void QRasterPaintEnginePrivate::rasterize(QT_FT_Outline *outline,
                                          ProcessSpans callback,
                                          void *userData, QRasterBuffer *)
{
    if (!callback || !outline)
        return;
 
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    if (!s->flags.antialiased) {
        rasterizer->setAntialiased(s->flags.antialiased);
        rasterizer->setClipRect(deviceRect);
        rasterizer->initialize(callback, userData);
 
        const Qt::FillRule fillRule = outline->flags == QT_FT_OUTLINE_NONE
                                      ? Qt::WindingFill
                                      : Qt::OddEvenFill;
 
        rasterizer->rasterize(outline, fillRule);
        return;
    }
 
    // Initial size for raster pool is MINIMUM_POOL_SIZE so as to
    // minimize memory reallocations. However if initial size for
    // raster pool is changed for lower value, reallocations will
    // occur normally.
    int rasterPoolSize = MINIMUM_POOL_SIZE;
    Q_DECL_UNINITIALIZED uchar rasterPoolOnStack[MINIMUM_POOL_SIZE + 0xf];
    uchar *rasterPoolBase = alignAddress(rasterPoolOnStack, 0xf);
    uchar *rasterPoolOnHeap = nullptr;
 
    QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_reset(*grayRaster.data(), rasterPoolBase, rasterPoolSize);
 
    void *data = userData;
 
    QT_FT_BBox clip_box = { deviceRect.x(),
                            deviceRect.y(),
                            deviceRect.x() + deviceRect.width(),
                            deviceRect.y() + deviceRect.height() };
 
    QT_FT_Raster_Params rasterParams;
    rasterParams.target = nullptr;
    rasterParams.source = outline;
    rasterParams.flags = QT_FT_RASTER_FLAG_CLIP;
    rasterParams.gray_spans = nullptr;
    rasterParams.black_spans = nullptr;
    rasterParams.bit_test = nullptr;
    rasterParams.bit_set = nullptr;
    rasterParams.user = data;
    rasterParams.clip_box = clip_box;
 
    bool done = false;
    int error;
 
    int rendered_spans = 0;
 
    while (!done) {
 
        rasterParams.flags |= (QT_FT_RASTER_FLAG_AA | QT_FT_RASTER_FLAG_DIRECT);
        rasterParams.gray_spans = callback;
        rasterParams.skip_spans = rendered_spans;
        error = QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_render(*grayRaster.data(), &rasterParams);
 
        // Out of memory, reallocate some more and try again...
        if (error == -6) { // ErrRaster_OutOfMemory from qgrayraster.c
            rasterPoolSize *= 2;
            if (rasterPoolSize > 1024 * 1024) {
                qWarning("QPainter: Rasterization of primitive failed");
                break;
            }
 
            rendered_spans += QT_MANGLE_NAMESPACE(q_gray_rendered_spans)(*grayRaster.data());
 
            free(rasterPoolOnHeap);
            rasterPoolOnHeap = (uchar *)malloc(rasterPoolSize + 0xf);
 
            Q_CHECK_PTR(rasterPoolOnHeap); // note: we just freed the old rasterPoolBase. I hope it's not fatal.
 
            rasterPoolBase = alignAddress(rasterPoolOnHeap, 0xf);
 
            QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_done(*grayRaster.data());
            QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_new(grayRaster.data());
            QT_MANGLE_NAMESPACE(qt_ft_grays_raster).raster_reset(*grayRaster.data(), rasterPoolBase, rasterPoolSize);
        } else {
            done = true;
        }
    }
 
    free(rasterPoolOnHeap);
}
 
void QRasterPaintEnginePrivate::updateClipping()
{
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    if (!s->clipEnabled)
        return;
 
    qrasterpaintengine_state_setNoClip(s);
    replayClipOperations();
}
 
void QRasterPaintEnginePrivate::recalculateFastImages()
{
    Q_Q(QRasterPaintEngine);
    QRasterPaintEngineState *s = q->state();
 
    s->flags.fast_images = !(s->renderHints & QPainter::SmoothPixmapTransform)
                           && s->matrix.type() <= QTransform::TxShear;
}
 
bool QRasterPaintEnginePrivate::canUseFastImageBlending(QPainter::CompositionMode mode, const QImage &image) const
{
    Q_Q(const QRasterPaintEngine);
    const QRasterPaintEngineState *s = q->state();
 
    return s->flags.fast_images
           && (mode == QPainter::CompositionMode_SourceOver
               || (mode == QPainter::CompositionMode_Source
                   && !image.hasAlphaChannel()));
}
 
bool QRasterPaintEnginePrivate::canUseImageBlitting(QPainter::CompositionMode mode, const QImage &image, const QPointF &pt, const QRectF &sr) const
{
    Q_Q(const QRasterPaintEngine);
 
    if (!(mode == QPainter::CompositionMode_Source
          || (mode == QPainter::CompositionMode_SourceOver
              && !image.hasAlphaChannel())))
        return false;
 
    const QRasterPaintEngineState *s = q->state();
    Q_ASSERT(s->matrix.type() <= QTransform::TxTranslate || s->matrix.type() == QTransform::TxRotate);
 
    if (s->intOpacity != 256
        || image.depth() < 8
        || ((s->renderHints & (QPainter::SmoothPixmapTransform | QPainter::Antialiasing))
            && (!isPixelAligned(pt) || !isPixelAligned(sr))))
        return false;
 
    QImage::Format dFormat = rasterBuffer->format;
    QImage::Format sFormat = image.format();
    // Formats must match or source format must be an opaque version of destination format
    if (dFormat != sFormat && image.pixelFormat().alphaUsage() == QPixelFormat::IgnoresAlpha)
        dFormat = qt_maybeDataCompatibleOpaqueVersion(dFormat);
    return (dFormat == sFormat);
}
 
QImage QRasterBuffer::colorizeBitmap(const QImage &image, const QColor &color)
{
    Q_ASSERT(image.depth() == 1);
 
    const QImage sourceImage = image.convertToFormat(QImage::Format_MonoLSB);
    QImage dest = QImage(sourceImage.size(), QImage::Format_ARGB32_Premultiplied);
    if (sourceImage.isNull() || dest.isNull())
        return image; // we must have run out of memory
 
    QRgb fg = qPremultiply(color.rgba());
    QRgb bg = 0;
 
    int height = sourceImage.height();
    int width = sourceImage.width();
    for (int y=0; y<height; ++y) {
        const uchar *source = sourceImage.constScanLine(y);
        QRgb *target = reinterpret_cast<QRgb *>(dest.scanLine(y));
        for (int x=0; x < width; ++x)
            target[x] = (source[x>>3] >> (x&7)) & 1 ? fg : bg;
    }
    return dest;
}
 
QRasterBuffer::~QRasterBuffer()
{
}
 
void QRasterBuffer::init()
{
    compositionMode = QPainter::CompositionMode_SourceOver;
    monoDestinationWithClut = false;
    destColor0 = 0;
    destColor1 = 0;
}
 
QImage::Format QRasterBuffer::prepare(QImage *image)
{
    m_buffer = (uchar *)image->bits();
    m_width = qMin(QT_RASTER_COORD_LIMIT, image->width());
    m_height = qMin(QT_RASTER_COORD_LIMIT, image->height());
    bytes_per_pixel = image->depth()/8;
    bytes_per_line = image->bytesPerLine();
 
    format = image->format();
    colorSpace = image->colorSpace();
    if (image->depth() == 1 && image->colorTable().size() == 2) {
        monoDestinationWithClut = true;
        const QList<QRgb> colorTable = image->colorTable();
        destColor0 = qPremultiply(colorTable[0]);
        destColor1 = qPremultiply(colorTable[1]);
    }
 
    return format;
}
 
QClipData::QClipData(int height)
{
    clipSpanHeight = height;
    m_clipLines = nullptr;
 
    allocated = 0;
    m_spans = nullptr;
    xmin = xmax = ymin = ymax = 0;
    count = 0;
 
    enabled = true;
    hasRectClip = hasRegionClip = false;
}
 
QClipData::~QClipData()
{
    if (m_clipLines)
        free(m_clipLines);
    if (m_spans)
        free(m_spans);
}
 
void QClipData::initialize()
{
    if (m_spans)
        return;
 
    if (!m_clipLines)
        m_clipLines = (ClipLine *)calloc(clipSpanHeight, sizeof(ClipLine));
 
    Q_CHECK_PTR(m_clipLines);
    QT_TRY {
        allocated = clipSpanHeight;
        count = 0;
        QT_TRY {
            if (hasRegionClip) {
                const auto rects = clipRegion.begin();
                const int numRects = clipRegion.rectCount();
                const int maxSpans = (ymax - ymin) * numRects;
                allocated = qMax(allocated, maxSpans);
                m_spans = (QT_FT_Span *)malloc(allocated * sizeof(QT_FT_Span));
                Q_CHECK_PTR(m_spans);
 
                int y = 0;
                int firstInBand = 0;
                while (firstInBand < numRects) {
                    const int currMinY = rects[firstInBand].y();
                    const int currMaxY = currMinY + rects[firstInBand].height();
 
                    while (y < currMinY) {
                        m_clipLines[y].spans = nullptr;
                        m_clipLines[y].count = 0;
                        ++y;
                    }
 
                    int lastInBand = firstInBand;
                    while (lastInBand + 1 < numRects && rects[lastInBand+1].top() == y)
                        ++lastInBand;
 
                    while (y < currMaxY) {
 
                        m_clipLines[y].spans = m_spans + count;
                        m_clipLines[y].count = lastInBand - firstInBand + 1;
 
                        for (int r = firstInBand; r <= lastInBand; ++r) {
                            const QRect &currRect = rects[r];
                            QT_FT_Span *span = m_spans + count;
                            span->x = currRect.x();
                            span->len = currRect.width();
                            span->y = y;
                            span->coverage = 255;
                            ++count;
                        }
                        ++y;
                    }
 
                    firstInBand = lastInBand + 1;
                }
 
                Q_ASSERT(count <= allocated);
 
                while (y < clipSpanHeight) {
                    m_clipLines[y].spans = nullptr;
                    m_clipLines[y].count = 0;
                    ++y;
                }
 
                return;
            }
 
            m_spans = (QT_FT_Span *)malloc(allocated * sizeof(QT_FT_Span));
            Q_CHECK_PTR(m_spans);
 
            if (hasRectClip) {
                int y = 0;
                while (y < ymin) {
                    m_clipLines[y].spans = nullptr;
                    m_clipLines[y].count = 0;
                    ++y;
                }
 
                const int len = clipRect.width();
                while (y < ymax) {
                    QT_FT_Span *span = m_spans + count;
                    span->x = xmin;
                    span->len = len;
                    span->y = y;
                    span->coverage = 255;
                    ++count;
 
                    m_clipLines[y].spans = span;
                    m_clipLines[y].count = 1;
                    ++y;
                }
 
                while (y < clipSpanHeight) {
                    m_clipLines[y].spans = nullptr;
                    m_clipLines[y].count = 0;
                    ++y;
                }
            }
        } QT_CATCH(...) {
            free(m_spans); // have to free m_spans again or someone might think that we were successfully initialized.
            m_spans = nullptr;
            QT_RETHROW;
        }
    } QT_CATCH(...) {
        free(m_clipLines); // same for clipLines
        m_clipLines = nullptr;
        QT_RETHROW;
    }
}
 
void QClipData::fixup()
{
    Q_ASSERT(m_spans);
 
    if (count == 0) {
        ymin = ymax = xmin = xmax = 0;
        return;
    }
 
    int y = -1;
    ymin = m_spans[0].y;
    ymax = m_spans[count-1].y + 1;
    xmin = INT_MAX;
    xmax = 0;
 
    const int firstLeft = m_spans[0].x;
    const int firstRight = m_spans[0].x + m_spans[0].len;
    bool isRect = true;
 
    for (int i = 0; i < count; ++i) {
        QT_FT_Span_& span = m_spans[i];
 
        if (span.y != y) {
            if (span.y != y + 1 && y != -1)
                isRect = false;
            y = span.y;
            m_clipLines[y].spans = &span;
            m_clipLines[y].count = 1;
        } else
            ++m_clipLines[y].count;
 
        const int spanLeft = span.x;
        const int spanRight = spanLeft + span.len;
 
        if (spanLeft < xmin)
            xmin = spanLeft;
 
        if (spanRight > xmax)
            xmax = spanRight;
 
        if (spanLeft != firstLeft || spanRight != firstRight)
            isRect = false;
    }
 
    if (isRect) {
        hasRectClip = true;
        clipRect.setRect(xmin, ymin, xmax - xmin, ymax - ymin);
    }
}
 
/*
    Convert \a rect to clip spans.
 */
void QClipData::setClipRect(const QRect &rect)
{
    if (hasRectClip && rect == clipRect)
        return;
 
//    qDebug() << "setClipRect" << clipSpanHeight << count << allocated << rect;
    hasRectClip = true;
    hasRegionClip = false;
    clipRect = rect;
 
    xmin = rect.x();
    xmax = rect.x() + rect.width();
    ymin = qMin(rect.y(), clipSpanHeight);
    ymax = qMin(rect.y() + rect.height(), clipSpanHeight);
 
    if (m_spans) {
        free(m_spans);
        m_spans = nullptr;
    }
 
//    qDebug() << xmin << xmax << ymin << ymax;
}
 
/*
    Convert \a region to clip spans.
 */
void QClipData::setClipRegion(const QRegion &region)
{
    if (region.rectCount() == 1) {
        setClipRect(region.boundingRect());
        return;
    }
 
    hasRegionClip = true;
    hasRectClip = false;
    clipRegion = region;
 
    { // set bounding rect
        const QRect rect = region.boundingRect();
        xmin = rect.x();
        xmax = rect.x() + rect.width();
        ymin = rect.y();
        ymax = rect.y() + rect.height();
    }
 
    if (m_spans) {
        free(m_spans);
        m_spans = nullptr;
    }
 
}
 
/*!
    \internal
    spans must be sorted on y
*/
static const QT_FT_Span *qt_intersect_spans(const QClipData *clip, int *currentClip,
                                            const QT_FT_Span *spans, const QT_FT_Span *end,
                                            QT_FT_Span **outSpans, int available)
{
    const_cast<QClipData *>(clip)->initialize();
 
    QT_FT_Span *out = *outSpans;
 
    const QT_FT_Span *clipSpans = clip->m_spans + *currentClip;
    const QT_FT_Span *clipEnd = clip->m_spans + clip->count;
 
    while (available && spans < end ) {
        if (clipSpans >= clipEnd) {
            spans = end;
            break;
        }
        if (clipSpans->y > spans->y) {
            ++spans;
            continue;
        }
        if (spans->y != clipSpans->y) {
            if (spans->y < clip->count && clip->m_clipLines[spans->y].spans)
                clipSpans = clip->m_clipLines[spans->y].spans;
            else
                ++clipSpans;
            continue;
        }
        Q_ASSERT(spans->y == clipSpans->y);
 
        int sx1 = spans->x;
        int sx2 = sx1 + spans->len;
        int cx1 = clipSpans->x;
        int cx2 = cx1 + clipSpans->len;
 
        if (cx1 < sx1 && cx2 < sx1) {
            ++clipSpans;
            continue;
        } else if (sx1 < cx1 && sx2 < cx1) {
            ++spans;
            continue;
        }
        int x = qMax(sx1, cx1);
        int len = qMin(sx2, cx2) - x;
        if (len) {
            out->x = qMax(sx1, cx1);
            out->len = qMin(sx2, cx2) - out->x;
            out->y = spans->y;
            out->coverage = qt_div_255(spans->coverage * clipSpans->coverage);
            ++out;
            --available;
        }
        if (sx2 < cx2) {
            ++spans;
        } else {
            ++clipSpans;
        }
    }
 
    *outSpans = out;
    *currentClip = clipSpans - clip->m_spans;
    return spans;
}
 
static void qt_span_fill_clipped(int spanCount, const QT_FT_Span *spans, void *userData)
{
//     qDebug() << "qt_span_fill_clipped" << spanCount;
    QSpanData *fillData = reinterpret_cast<QSpanData *>(userData);
 
    Q_ASSERT(fillData->blend && fillData->unclipped_blend);
 
    const int NSPANS = 512;
    Q_DECL_UNINITIALIZED QT_FT_Span cspans[NSPANS];
    int currentClip = 0;
    const QT_FT_Span *end = spans + spanCount;
    while (spans < end) {
        QT_FT_Span *clipped = cspans;
        spans = qt_intersect_spans(fillData->clip, &currentClip, spans, end, &clipped, NSPANS);
//         qDebug() << "processed " << spanCount - (end - spans) << "clipped" << clipped-cspans
//                  << "span:" << cspans->x << cspans->y << cspans->len << spans->coverage;
 
        if (clipped - cspans)
            fillData->unclipped_blend(clipped - cspans, cspans, fillData);
    }
}
 
/*
    \internal
    Clip spans to \a{clip}-rectangle.
    Returns number of unclipped spans
*/
static int qt_intersect_spans(QT_FT_Span *&spans, int numSpans,
                              const QRect &clip)
{
    const int minx = clip.left();
    const int miny = clip.top();
    const int maxx = clip.right();
    const int maxy = clip.bottom();
 
    QT_FT_Span *end = spans + numSpans;
    while (spans < end) {
        if (spans->y >= miny)
            break;
        ++spans;
    }
 
    QT_FT_Span *s = spans;
    while (s < end) {
        if (s->y > maxy)
            break;
        if (s->x > maxx || s->x + s->len <= minx) {
            s->len = 0;
            ++s;
            continue;
        }
        if (s->x < minx) {
            s->len = qMin(s->len - (minx - s->x), maxx - minx + 1);
            s->x = minx;
        } else {
            s->len = qMin(s->len, (maxx - s->x + 1));
        }
        ++s;
    }
 
    return s - spans;
}
 
 
static void qt_span_fill_clipRect(int count, const QT_FT_Span *spans,
                                  void *userData)
{
    QSpanData *fillData = reinterpret_cast<QSpanData *>(userData);
    Q_ASSERT(fillData->blend && fillData->unclipped_blend);
 
    Q_ASSERT(fillData->clip);
    Q_ASSERT(!fillData->clip->clipRect.isEmpty());
 
    QT_FT_Span *s = const_cast<QT_FT_Span *>(spans);
    // hw: check if this const_cast<> is safe!!!
    count = qt_intersect_spans(s, count,
                               fillData->clip->clipRect);
    if (count > 0)
        fillData->unclipped_blend(count, s, fillData);
}
 
static void qt_span_clip(int count, const QT_FT_Span *spans, void *userData)
{
    ClipData *clipData = reinterpret_cast<ClipData *>(userData);
 
//     qDebug() << " qt_span_clip: " << count << clipData->operation;
//     for (int i = 0; i < qMin(count, 10); ++i) {
//         qDebug() << "    " << spans[i].x << spans[i].y << spans[i].len << spans[i].coverage;
//     }
 
    switch (clipData->operation) {
 
    case Qt::IntersectClip:
        {
            QClipData *newClip = clipData->newClip;
            newClip->initialize();
 
            int currentClip = 0;
            const QT_FT_Span *end = spans + count;
            while (spans < end) {
                QT_FT_Span *newspans = newClip->m_spans + newClip->count;
                spans = qt_intersect_spans(clipData->oldClip, &currentClip, spans, end,
                                           &newspans, newClip->allocated - newClip->count);
                newClip->count = newspans - newClip->m_spans;
                if (spans < end) {
                    newClip->m_spans = q_check_ptr((QT_FT_Span *)realloc(newClip->m_spans, newClip->allocated * 2 * sizeof(QT_FT_Span)));
                    newClip->allocated *= 2;
                }
            }
        }
        break;
 
    case Qt::ReplaceClip:
        clipData->newClip->appendSpans(spans, count);
        break;
    case Qt::NoClip:
        break;
    }
}
 
class QGradientCache
{
public:
    struct CacheInfo
    {
        inline CacheInfo(QGradientStops s, int op, QGradient::InterpolationMode mode) :
            stops(std::move(s)), opacity(op), interpolationMode(mode) {}
        QRgba64 buffer64[GRADIENT_STOPTABLE_SIZE];
        QRgb buffer32[GRADIENT_STOPTABLE_SIZE];
        QGradientStops stops;
        int opacity;
        QGradient::InterpolationMode interpolationMode;
    };
 
    using QGradientColorTableHash = QMultiHash<quint64, std::shared_ptr<const CacheInfo>>;
 
    std::shared_ptr<const CacheInfo> getBuffer(const QGradient &gradient, int opacity) {
        quint64 hash_val = 0;
 
        const QGradientStops stops = gradient.stops();
        for (int i = 0; i < stops.size() && i <= 2; i++)
            hash_val += stops[i].second.rgba64();
 
        QMutexLocker lock(&mutex);
        QGradientColorTableHash::const_iterator it = cache.constFind(hash_val);
 
        if (it == cache.constEnd())
            return addCacheElement(hash_val, gradient, opacity);
        else {
            do {
                const auto &cache_info = it.value();
                if (cache_info->stops == stops && cache_info->opacity == opacity && cache_info->interpolationMode == gradient.interpolationMode())
                    return cache_info;
                ++it;
            } while (it != cache.constEnd() && it.key() == hash_val);
            // an exact match for these stops and opacity was not found, create new cache
            return addCacheElement(hash_val, gradient, opacity);
        }
    }
 
    inline int paletteSize() const { return GRADIENT_STOPTABLE_SIZE; }
protected:
    inline int maxCacheSize() const { return 60; }
    inline void generateGradientColorTable(const QGradient& g,
                                           QRgba64 *colorTable,
                                           int size, int opacity) const;
    std::shared_ptr<const CacheInfo> addCacheElement(quint64 hash_val, const QGradient &gradient, int opacity) {
        if (cache.size() == maxCacheSize()) {
            // may remove more than 1, but OK
            cache.erase(std::next(cache.begin(), QRandomGenerator::global()->bounded(maxCacheSize())));
        }
        auto cache_entry = std::make_shared<CacheInfo>(gradient.stops(), opacity, gradient.interpolationMode());
        generateGradientColorTable(gradient, cache_entry->buffer64, paletteSize(), opacity);
        for (int i = 0; i < GRADIENT_STOPTABLE_SIZE; ++i)
            cache_entry->buffer32[i] = cache_entry->buffer64[i].toArgb32();
        return cache.insert(hash_val, std::move(cache_entry)).value();
    }
 
    QGradientColorTableHash cache;
    QMutex mutex;
};
 
void QGradientCache::generateGradientColorTable(const QGradient& gradient, QRgba64 *colorTable, int size, int opacity) const
{
    const QGradientStops stops = gradient.stops();
    int stopCount = stops.size();
    Q_ASSERT(stopCount > 0);
 
    bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
 
    if (stopCount == 2) {
        QRgba64 first_color = combineAlpha256(stops[0].second.rgba64(), opacity);
        QRgba64 second_color = combineAlpha256(stops[1].second.rgba64(), opacity);
 
        qreal first_stop = stops[0].first;
        qreal second_stop = stops[1].first;
 
        if (second_stop < first_stop) {
            quint64 tmp = first_color;
            first_color = second_color;
            second_color = tmp;
            qSwap(first_stop, second_stop);
        }
 
        if (colorInterpolation) {
            first_color = qPremultiply(first_color);
            second_color = qPremultiply(second_color);
        }
 
        int first_index = qRound(first_stop * (GRADIENT_STOPTABLE_SIZE-1));
        int second_index = qRound(second_stop * (GRADIENT_STOPTABLE_SIZE-1));
 
        uint red_first = uint(first_color.red()) << 16;
        uint green_first = uint(first_color.green()) << 16;
        uint blue_first = uint(first_color.blue()) << 16;
        uint alpha_first = uint(first_color.alpha()) << 16;
 
        uint red_second = uint(second_color.red()) << 16;
        uint green_second = uint(second_color.green()) << 16;
        uint blue_second = uint(second_color.blue()) << 16;
        uint alpha_second = uint(second_color.alpha()) << 16;
 
        int i = 0;
        for (; i <= qMin(GRADIENT_STOPTABLE_SIZE, first_index); ++i) {
            if (colorInterpolation)
                colorTable[i] = first_color;
            else
                colorTable[i] = qPremultiply(first_color);
        }
 
        if (i < second_index) {
            qreal reciprocal = qreal(1) / (second_index - first_index);
 
            int red_delta = qRound((qreal(red_second) - red_first) * reciprocal);
            int green_delta = qRound((qreal(green_second) - green_first) * reciprocal);
            int blue_delta = qRound((qreal(blue_second) - blue_first) * reciprocal);
            int alpha_delta = qRound((qreal(alpha_second) - alpha_first) * reciprocal);
 
            // rounding
            red_first += 1 << 15;
            green_first += 1 << 15;
            blue_first += 1 << 15;
            alpha_first += 1 << 15;
 
            for (; i < qMin(GRADIENT_STOPTABLE_SIZE, second_index); ++i) {
                red_first += red_delta;
                green_first += green_delta;
                blue_first += blue_delta;
                alpha_first += alpha_delta;
 
                const QRgba64 color = qRgba64(red_first >> 16, green_first >> 16, blue_first >> 16, alpha_first >> 16);
 
                if (colorInterpolation)
                    colorTable[i] = color;
                else
                    colorTable[i] = qPremultiply(color);
            }
        }
 
        for (; i < GRADIENT_STOPTABLE_SIZE; ++i) {
            if (colorInterpolation)
                colorTable[i] = second_color;
            else
                colorTable[i] = qPremultiply(second_color);
        }
 
        return;
    }
 
    QRgba64 current_color = combineAlpha256(stops[0].second.rgba64(), opacity);
    if (stopCount == 1) {
        current_color = qPremultiply(current_color);
        for (int i = 0; i < size; ++i)
            colorTable[i] = current_color;
        return;
    }
 
    // The position where the gradient begins and ends
    qreal begin_pos = stops[0].first;
    qreal end_pos = stops[stopCount-1].first;
 
    int pos = 0; // The position in the color table.
    QRgba64 next_color;
 
    qreal incr = 1 / qreal(size); // the double increment.
    qreal dpos = 1.5 * incr; // current position in gradient stop list (0 to 1)
 
     // Up to first point
    colorTable[pos++] = qPremultiply(current_color);
    while (dpos <= begin_pos) {
        colorTable[pos] = colorTable[pos - 1];
        ++pos;
        dpos += incr;
    }
 
    int current_stop = 0; // We always interpolate between current and current + 1.
 
    qreal t; // position between current left and right stops
    qreal t_delta; // the t increment per entry in the color table
 
    if (dpos < end_pos) {
        // Gradient area
        while (dpos > stops[current_stop+1].first)
            ++current_stop;
 
        if (current_stop != 0)
            current_color = combineAlpha256(stops[current_stop].second.rgba64(), opacity);
        next_color = combineAlpha256(stops[current_stop+1].second.rgba64(), opacity);
 
        if (colorInterpolation) {
            current_color = qPremultiply(current_color);
            next_color = qPremultiply(next_color);
        }
 
        qreal diff = stops[current_stop+1].first - stops[current_stop].first;
        qreal c = (diff == 0) ? qreal(0) : 256 / diff;
        t = (dpos - stops[current_stop].first) * c;
        t_delta = incr * c;
 
        while (true) {
            Q_ASSERT(current_stop < stopCount);
 
            int dist = qRound(t);
            int idist = 256 - dist;
 
            if (colorInterpolation)
                colorTable[pos] = interpolate256(current_color, idist, next_color, dist);
            else
                colorTable[pos] = qPremultiply(interpolate256(current_color, idist, next_color, dist));
 
            ++pos;
            dpos += incr;
 
            if (dpos >= end_pos)
                break;
 
            t += t_delta;
 
            int skip = 0;
            while (dpos > stops[current_stop+skip+1].first)
                ++skip;
 
            if (skip != 0) {
                current_stop += skip;
                if (skip == 1)
                    current_color = next_color;
                else
                    current_color = combineAlpha256(stops[current_stop].second.rgba64(), opacity);
                next_color = combineAlpha256(stops[current_stop+1].second.rgba64(), opacity);
 
                if (colorInterpolation) {
                    if (skip != 1)
                        current_color = qPremultiply(current_color);
                    next_color = qPremultiply(next_color);
                }
 
                qreal diff = stops[current_stop+1].first - stops[current_stop].first;
                qreal c = (diff == 0) ? qreal(0) : 256 / diff;
                t = (dpos - stops[current_stop].first) * c;
                t_delta = incr * c;
            }
        }
    }
 
    // After last point
    current_color = qPremultiply(combineAlpha256(stops[stopCount - 1].second.rgba64(), opacity));
    while (pos < size - 1) {
        colorTable[pos] = current_color;
        ++pos;
    }
 
    // Make sure the last color stop is represented at the end of the table
    colorTable[size - 1] = current_color;
}
 
Q_GLOBAL_STATIC(QGradientCache, qt_gradient_cache)
 
 
void QSpanData::init(QRasterBuffer *rb, const QRasterPaintEngine *pe)
{
    rasterBuffer = rb;
    type = None;
    txop = 0;
    bilinear = false;
    m11 = m22 = m33 = 1.;
    m12 = m13 = m21 = m23 = dx = dy = 0.0;
    clip = pe ? pe->d_func()->clip() : nullptr;
}
 
Q_GUI_EXPORT extern QImage qt_imageForBrush(int brushStyle, bool invert);
 
void QSpanData::setup(const QBrush &brush, int alpha, QPainter::CompositionMode compositionMode,
                      bool isCosmetic)
{
    Qt::BrushStyle brushStyle = qbrush_style(brush);
    cachedGradient.reset();
    switch (brushStyle) {
    case Qt::SolidPattern: {
        type = Solid;
        QColor c = qbrush_color(brush);
        solidColor = qPremultiplyWithExtraAlpha(c, alpha);
        if (solidColor.alphaF() <= 0.0f && compositionMode == QPainter::CompositionMode_SourceOver)
            type = None;
        break;
    }
 
    case Qt::LinearGradientPattern:
        {
            type = LinearGradient;
            const QLinearGradient *g = static_cast<const QLinearGradient *>(brush.gradient());
            gradient.alphaColor = !brush.isOpaque() || alpha != 256;
 
            auto cacheInfo = qt_gradient_cache()->getBuffer(*g, alpha);
            gradient.colorTable32 = cacheInfo->buffer32;
#if QT_CONFIG(raster_64bit) || QT_CONFIG(raster_fp)
            gradient.colorTable64 = cacheInfo->buffer64;
#endif
            cachedGradient = std::move(cacheInfo);
 
            gradient.spread = g->spread();
 
            QLinearGradientData &linearData = gradient.linear;
 
            linearData.origin.x = g->start().x();
            linearData.origin.y = g->start().y();
            linearData.end.x = g->finalStop().x();
            linearData.end.y = g->finalStop().y();
            break;
        }
 
    case Qt::RadialGradientPattern:
        {
            type = RadialGradient;
            const QRadialGradient *g = static_cast<const QRadialGradient *>(brush.gradient());
            gradient.alphaColor = !brush.isOpaque() || alpha != 256;
 
            auto cacheInfo = qt_gradient_cache()->getBuffer(*g, alpha);
            gradient.colorTable32 = cacheInfo->buffer32;
#if QT_CONFIG(raster_64bit) || QT_CONFIG(raster_fp)
            gradient.colorTable64 = cacheInfo->buffer64;
#endif
            cachedGradient = std::move(cacheInfo);
 
            gradient.spread = g->spread();
 
            QRadialGradientData &radialData = gradient.radial;
 
            QPointF center = g->center();
            radialData.center.x = center.x();
            radialData.center.y = center.y();
            radialData.center.radius = g->centerRadius();
            QPointF focal = g->focalPoint();
            radialData.focal.x = focal.x();
            radialData.focal.y = focal.y();
            radialData.focal.radius = g->focalRadius();
        }
        break;
 
    case Qt::ConicalGradientPattern:
        {
            type = ConicalGradient;
            const QConicalGradient *g = static_cast<const QConicalGradient *>(brush.gradient());
            gradient.alphaColor = !brush.isOpaque() || alpha != 256;
 
            auto cacheInfo = qt_gradient_cache()->getBuffer(*g, alpha);
            gradient.colorTable32 = cacheInfo->buffer32;
#if QT_CONFIG(raster_64bit) || QT_CONFIG(raster_fp)
            gradient.colorTable64 = cacheInfo->buffer64;
#endif
            cachedGradient = std::move(cacheInfo);
 
            gradient.spread = QGradient::RepeatSpread;
 
            QConicalGradientData &conicalData = gradient.conical;
 
            QPointF center = g->center();
            conicalData.center.x = center.x();
            conicalData.center.y = center.y();
            conicalData.angle = qDegreesToRadians(g->angle());
        }
        break;
 
    case Qt::Dense1Pattern:
    case Qt::Dense2Pattern:
    case Qt::Dense3Pattern:
    case Qt::Dense4Pattern:
    case Qt::Dense5Pattern:
    case Qt::Dense6Pattern:
    case Qt::Dense7Pattern:
    case Qt::HorPattern:
    case Qt::VerPattern:
    case Qt::CrossPattern:
    case Qt::BDiagPattern:
    case Qt::FDiagPattern:
    case Qt::DiagCrossPattern:
        type = Texture;
        if (!tempImage)
            tempImage = new QImage();
        *tempImage = rasterBuffer->colorizeBitmap(qt_imageForBrush(brushStyle, true), brush.color());
        initTexture(tempImage, alpha, isCosmetic ? QTextureData::Pattern : QTextureData::Tiled);
        break;
    case Qt::TexturePattern:
        type = Texture;
        if (!tempImage)
            tempImage = new QImage();
 
        if (qHasPixmapTexture(brush) && brush.texture().isQBitmap())
            *tempImage = rasterBuffer->colorizeBitmap(brush.textureImage(), brush.color());
        else
            *tempImage = brush.textureImage();
        initTexture(tempImage, alpha, QTextureData::Tiled, tempImage->rect());
        break;
 
    case Qt::NoBrush:
    default:
        type = None;
        break;
    }
    adjustSpanMethods();
}
 
void QSpanData::adjustSpanMethods()
{
    bitmapBlit = nullptr;
    alphamapBlit = nullptr;
    alphaRGBBlit = nullptr;
 
    fillRect = nullptr;
 
    switch(type) {
    case None:
        unclipped_blend = nullptr;
        break;
    case Solid: {
        const DrawHelper &drawHelper = qDrawHelper[rasterBuffer->format];
        unclipped_blend = drawHelper.blendColor;
        bitmapBlit = drawHelper.bitmapBlit;
        alphamapBlit = drawHelper.alphamapBlit;
        alphaRGBBlit = drawHelper.alphaRGBBlit;
        fillRect = drawHelper.fillRect;
        break;
    }
    case LinearGradient:
    case RadialGradient:
    case ConicalGradient:
        unclipped_blend = qBlendGradient;
        break;
    case Texture:
        unclipped_blend = qBlendTexture;
        if (!texture.imageData)
            unclipped_blend = nullptr;
 
        break;
    }
    // setup clipping
    if (!unclipped_blend) {
        blend = nullptr;
    } else if (!clip) {
        blend = unclipped_blend;
    } else if (clip->hasRectClip) {
        blend = clip->clipRect.isEmpty() ? nullptr : qt_span_fill_clipRect;
    } else {
        blend = qt_span_fill_clipped;
    }
}
 
void QSpanData::setupMatrix(const QTransform &matrix, int bilin)
{
    QTransform delta;
    // make sure we round off correctly in qdrawhelper.cpp
    delta.translate(1.0 / 65536, 1.0 / 65536);
 
    QTransform inv = (delta * matrix).inverted();
    m11 = inv.m11();
    m12 = inv.m12();
    m13 = inv.m13();
    m21 = inv.m21();
    m22 = inv.m22();
    m23 = inv.m23();
    m33 = inv.m33();
    dx = inv.dx();
    dy = inv.dy();
    txop = inv.type();
    bilinear = bilin;
 
    const bool affine = inv.isAffine();
    const qreal f1 = m11 * m11 + m21 * m21;
    const qreal f2 = m12 * m12 + m22 * m22;
    fast_matrix = affine
        && f1 < 1e4
        && f2 < 1e4
        && f1 > (1.0 / 65536)
        && f2 > (1.0 / 65536)
        && qAbs(dx) < 1e4
        && qAbs(dy) < 1e4;
 
    adjustSpanMethods();
}
 
void QSpanData::initTexture(const QImage *image, int alpha, QTextureData::Type _type, const QRect &sourceRect)
{
    const QImageData *d = const_cast<QImage *>(image)->data_ptr();
    if (!d || d->height == 0) {
        texture.imageData = nullptr;
        texture.width = 0;
        texture.height = 0;
        texture.x1 = 0;
        texture.y1 = 0;
        texture.x2 = 0;
        texture.y2 = 0;
        texture.bytesPerLine = 0;
        texture.format = QImage::Format_Invalid;
        texture.colorTable = nullptr;
        texture.hasAlpha = alpha != 256;
    } else {
        texture.imageData = d->data;
        texture.width = d->width;
        texture.height = d->height;
 
        if (sourceRect.isNull()) {
            texture.x1 = 0;
            texture.y1 = 0;
            texture.x2 = texture.width;
            texture.y2 = texture.height;
        } else {
            texture.x1 = sourceRect.x();
            texture.y1 = sourceRect.y();
            texture.x2 = qMin(texture.x1 + sourceRect.width(), d->width);
            texture.y2 = qMin(texture.y1 + sourceRect.height(), d->height);
        }
 
        texture.bytesPerLine = d->bytes_per_line;
 
        texture.format = d->format;
        texture.colorTable = (d->format <= QImage::Format_Indexed8 && !d->colortable.isEmpty()) ? &d->colortable : nullptr;
        texture.hasAlpha = image->hasAlphaChannel() || alpha != 256;
    }
    texture.const_alpha = alpha;
    texture.type = _type;
 
    adjustSpanMethods();
}
 
/*!
    \internal
    \a x and \a y is relative to the midpoint of \a rect.
*/
static inline void drawEllipsePoints(int x, int y, int length,
                                     const QRect &rect,
                                     const QRect &clip,
                                     ProcessSpans pen_func, ProcessSpans brush_func,
                                     QSpanData *pen_data, QSpanData *brush_data)
{
    if (length == 0)
        return;
 
    QT_FT_Span _outline[4];
    QT_FT_Span *outline = _outline;
    const int midx = rect.x() + (rect.width() + 1) / 2;
    const int midy = rect.y() + (rect.height() + 1) / 2;
 
    x = x + midx;
    y = midy - y;
 
    // topleft
    outline[0].x = midx + (midx - x) - (length - 1) - (rect.width() & 0x1);
    outline[0].len = qMin(length, x - outline[0].x);
    outline[0].y = y;
    outline[0].coverage = 255;
 
    // topright
    outline[1].x = x;
    outline[1].len = length;
    outline[1].y = y;
    outline[1].coverage = 255;
 
    // bottomleft
    outline[2].x = outline[0].x;
    outline[2].len = outline[0].len;
    outline[2].y = midy + (midy - y) - (rect.height() & 0x1);
    outline[2].coverage = 255;
 
    // bottomright
    outline[3].x = x;
    outline[3].len = length;
    outline[3].y = outline[2].y;
    outline[3].coverage = 255;
 
    if (brush_func && outline[0].x + outline[0].len < outline[1].x) {
        QT_FT_Span _fill[2];
        QT_FT_Span *fill = _fill;
 
        // top fill
        fill[0].x = outline[0].x + outline[0].len - 1;
        fill[0].len = qMax(0, outline[1].x - fill[0].x);
        fill[0].y = outline[1].y;
        fill[0].coverage = 255;
 
        // bottom fill
        fill[1].x = outline[2].x + outline[2].len - 1;
        fill[1].len = qMax(0, outline[3].x - fill[1].x);
        fill[1].y = outline[3].y;
        fill[1].coverage = 255;
 
        int n = (fill[0].y >= fill[1].y ? 1 : 2);
        n = qt_intersect_spans(fill, n, clip);
        if (n > 0)
            brush_func(n, fill, brush_data);
    }
    if (pen_func) {
        int n = (outline[1].y >= outline[2].y ? 2 : 4);
        n = qt_intersect_spans(outline, n, clip);
        if (n > 0)
            pen_func(n, outline, pen_data);
    }
}
 
/*!
    \internal
    Draws an ellipse using the integer point midpoint algorithm.
*/
static void drawEllipse_midpoint_i(const QRect &rect, const QRect &clip,
                                   ProcessSpans pen_func, ProcessSpans brush_func,
                                   QSpanData *pen_data, QSpanData *brush_data)
{
    const qreal a = qreal(rect.width()) / 2;
    const qreal b = qreal(rect.height()) / 2;
    qreal d = b*b - (a*a*b) + 0.25*a*a;
 
    int x = 0;
    int y = (rect.height() + 1) / 2;
    int startx = x;
 
    // region 1
    while (a*a*(2*y - 1) > 2*b*b*(x + 1)) {
        if (d < 0) { // select E
            d += b*b*(2*x + 3);
            ++x;
        } else {     // select SE
            d += b*b*(2*x + 3) + a*a*(-2*y + 2);
            drawEllipsePoints(startx, y, x - startx + 1, rect, clip,
                              pen_func, brush_func, pen_data, brush_data);
            startx = ++x;
            --y;
        }
    }
    drawEllipsePoints(startx, y, x - startx + 1, rect, clip,
                      pen_func, brush_func, pen_data, brush_data);
 
    // region 2
    d = b*b*(x + 0.5)*(x + 0.5) + a*a*((y - 1)*(y - 1) - b*b);
    const int miny = rect.height() & 0x1;
    while (y > miny) {
        if (d < 0) { // select SE
            d += b*b*(2*x + 2) + a*a*(-2*y + 3);
            ++x;
        } else {     // select S
            d += a*a*(-2*y + 3);
        }
        --y;
        drawEllipsePoints(x, y, 1, rect, clip,
                          pen_func, brush_func, pen_data, brush_data);
    }
}
 
/*
    \fn void QRasterPaintEngine::drawPoints(const QPoint *points, int pointCount)
    \overload
    \reimp
*/
 
 
#ifdef QT_DEBUG_DRAW
void dumpClip(int width, int height, const QClipData *clip)
{
    QImage clipImg(width, height, QImage::Format_ARGB32_Premultiplied);
    clipImg.fill(0xffff0000);
 
    int x0 = width;
    int x1 = 0;
    int y0 = height;
    int y1 = 0;
 
    ((QClipData *) clip)->spans(); // Force allocation of the spans structure...
 
    for (int i = 0; i < clip->count; ++i) {
        const QT_FT_Span *span = ((QClipData *) clip)->spans() + i;
        for (int j = 0; j < span->len; ++j)
            clipImg.setPixel(span->x + j, span->y, 0xffffff00);
        x0 = qMin(x0, int(span->x));
        x1 = qMax(x1, int(span->x + span->len - 1));
 
        y0 = qMin(y0, int(span->y));
        y1 = qMax(y1, int(span->y));
    }
 
    static int counter = 0;
 
    Q_ASSERT(y0 >= 0);
    Q_ASSERT(x0 >= 0);
    Q_ASSERT(y1 >= 0);
    Q_ASSERT(x1 >= 0);
 
    fprintf(stderr,"clip %d: %d %d - %d %d\n", counter, x0, y0, x1, y1);
    clipImg.save(QString::fromLatin1("clip-%0.png").arg(counter++));
}
#endif
 
 
QT_END_NAMESPACE