qpaintengine_raster.cpp

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** Contact: https://www.qt.io/licensing/
**
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#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 qreal_to_fixed_26_6(f) (int(f * 64))
#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;
}
 
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 QSpan *spans, void *userData);
static void qt_span_fill_clipped(int count, const QSpan *spans, void *userData);
static void qt_span_clip(int count, const QSpan *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)
{
}
 
 
/*
    \fn QPaintEngine::Type QRasterPaintEngine::type() const
    \reimp
*/
 
QRasterPaintEngine::QRasterPaintEngine(QPaintDevice *device)
    : QPaintEngineEx(*(new QRasterPaintEnginePrivate))
{
    d_func()->device = device;
    init();
}
 
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_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;
    }
}
 
 
QRasterPaintEngine::~QRasterPaintEngine()
{
    Q_D(QRasterPaintEngine);
 
    qt_ft_grays_raster.raster_done(*d->grayRaster.data());
}
 
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->m_clip_rect = d->deviceRect;
 
    if (d->outlineMapper->m_clip_rect.width() > QT_RASTER_COORD_LIMIT)
        d->outlineMapper->m_clip_rect.setWidth(QT_RASTER_COORD_LIMIT);
    if (d->outlineMapper->m_clip_rect.height() > QT_RASTER_COORD_LIMIT)
        d->outlineMapper->m_clip_rect.setHeight(QT_RASTER_COORD_LIMIT);
 
    d->rasterizer->setClipRect(d->deviceRect);
 
    s->penData.init(d->rasterBuffer.data(), this);
    s->penData.setup(s->pen.brush(), s->intOpacity, s->composition_mode);
    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);
 
    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;
}
 
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;
}
 
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.;
 
    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;
 
    clip = nullptr;
    flags.has_clip_ownership = false;
 
    dirty = 0;
}
 
QRasterPaintEngineState::QRasterPaintEngineState(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;
}
 
QPainterState *QRasterPaintEngine::createState(QPainterState *orig) const
{
    QRasterPaintEngineState *s;
    if (!orig)
        s = new QRasterPaintEngineState();
    else
        s = new QRasterPaintEngineState(*static_cast<QRasterPaintEngineState *>(orig));
 
    return s;
}
 
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;
}
 
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;
}
 
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);
 
    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;
}
 
 
 
void QRasterPaintEngine::brushOriginChanged()
{
    QRasterPaintEngineState *s = state();
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::brushOriginChanged()" << s->brushOrigin;
#endif
 
    s->fillFlags |= DirtyBrushOrigin;
}
 
 
void QRasterPaintEngine::brushChanged()
{
    QRasterPaintEngineState *s = state();
#ifdef QT_DEBUG_DRAW
    qDebug() << "QRasterPaintEngine::brushChanged():" << s->brush;
#endif
    s->fillFlags |= DirtyBrush;
}
 
 
 
 
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);
    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.isOpaque()));
    }
 
    s->dirty = 0;
}
 
 
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);
}
 
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();
}
 
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;
 
    s->flags.antialiased = bool(s->renderHints & QPainter::Antialiasing);
    s->flags.bilinear = bool(s->renderHints & QPainter::SmoothPixmapTransform);
 
    if (was_aa != s->flags.antialiased)
        s->strokeFlags |= DirtyHints;
 
    if (was_bilinear != s->flags.bilinear) {
        s->strokeFlags |= DirtyPen;
        s->fillFlags |= DirtyBrush;
    }
 
    Q_D(QRasterPaintEngine);
    d->recalculateFastImages();
 
    if (was_aa != s->flags.antialiased)
        d->updateClipping();
}
 
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();
}
 
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
 
}
 
 
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);
}
 
 
 
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;
}
 
 
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);
    }
}
 
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.isOpaque())))
        {
            data->fillRect(data->rasterBuffer, x1, y1, width, height, data->solidColor);
            return;
        }
    }
 
    ProcessSpans blend = isUnclipped ? data->unclipped_blend : data->blend;
 
    const int nspans = 256;
    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;
    }
}
 
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);
            }
        }
    }
}
 
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);
}
 
 
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) {
                    QPointF p = lines[i].p1();
                    QLineF mappedline = s->matrix.map(QLineF(QPointF(p.x() - width*0.5, p.y()),
                                                       QPointF(p.x() + width*0.5, p.y())));
                    d->rasterizer->rasterizeLine(mappedline.p1(), mappedline.p2(),
                                                 width / mappedline.length());
                }
                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);
}
 
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);
}
 
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);
}
 
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 = qPremultiply(combineAlpha256(color.rgba64(), s->intOpacity));
 
    if (d->solid_color_filler.solidColor.isTransparent()
        && 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;
}
 
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());
}
 
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);
        }
    }
}
 
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);
        }
    }
}
 
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);
        }
    }
}
 
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);
}
 
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;
    }
}
 
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);
        switch (img.format()) {
        case QImage::Format_ARGB32_Premultiplied:
        case QImage::Format_ARGB8565_Premultiplied:
        case QImage::Format_ARGB6666_Premultiplied:
        case QImage::Format_ARGB8555_Premultiplied:
        case QImage::Format_ARGB4444_Premultiplied:
        case QImage::Format_RGBA8888_Premultiplied:
        case QImage::Format_A2BGR30_Premultiplied:
        case QImage::Format_A2RGB30_Premultiplied:
            // Combine premultiplied color with the opacity set on the painter.
            d->solid_color_filler.solidColor = multiplyAlpha256(QRgba64::fromArgb32(color), s->intOpacity);
            break;
        default:
            d->solid_color_filler.solidColor = qPremultiply(combineAlpha256(QRgba64::fromArgb32(color), s->intOpacity));
            break;
        }
 
        if (d->solid_color_filler.solidColor.isTransparent() && 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);
        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)) {
                    func(d->rasterBuffer->buffer(), d->rasterBuffer->bytesPerLine(),
                         img.bits(), img.bytesPerLine(), img.height(),
                         qt_mapRect_non_normalizing(r, s->matrix), 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);
    }
}
 
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;
}
 
QRasterBuffer *QRasterPaintEngine::rasterBuffer()
{
    Q_D(QRasterPaintEngine);
    return d->rasterBuffer.data();
}
 
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,
                                          scanline, w, h, bpl);
                    return;
                }
            } else if (depth == 8) {
                if (s->penData.alphamapBlit) {
                    s->penData.alphamapBlit(rb, rx, ry, s->penData.solidColor,
                                            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,
                                            (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,
                                        scanline, w, h, bpl, clip, useGammaCorrection);
            else if (depth == 32)
                s->penData.alphaRGBBlit(rb, rx, ry, s->penData.solidColor,
                                        (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 = 256;
    QSpan 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);
}
 
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, QColor(s->penData.solidColor)));
        if (!cache) {
            cache = new QImageTextureGlyphCache(glyphFormat, s->matrix, QColor(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;
}
 
 
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() <= INT_MIN || norm.top() <= INT_MIN
            || norm.right() > INT_MAX || norm.bottom() > INT_MAX
            || norm.width() > INT_MAX || norm.height() > 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;
}
 
static QPair<int, int> 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 QPair<int, int>(first, last + 1);
}
 
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;
 
        QPair<int, int> range = visibleGlyphRange(invMat.mapRect(clipBoundingRect()),
                                                  textItem->fontEngine(), textItem->glyphs,
                                                  textItem->glyphPositions, textItem->numGlyphs);
        QStaticTextItem copy = *textItem;
        copy.glyphs += range.first;
        copy.glyphPositions += range.first;
        copy.numGlyphs = range.second - range.first;
        QPaintEngineEx::drawStaticTextItem(&copy);
    } else {
        QPaintEngineEx::drawStaticTextItem(textItem);
    }
}
 
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);
        QPair<int, int> range = visibleGlyphRange(invMat.mapRect(clipBoundingRect()),
                                                  ti.fontEngine, glyphs.data(), positions.data(),
                                                  glyphs.size());
 
        if (range.first >= range.second)
            return;
 
        QStaticTextItem staticTextItem;
        staticTextItem.color = s->pen.color();
        staticTextItem.font = s->font;
        staticTextItem.setFontEngine(ti.fontEngine);
        staticTextItem.numGlyphs = range.second - range.first;
        staticTextItem.glyphs = glyphs.data() + range.first;
        staticTextItem.glyphPositions = positions.data() + range.first;
        QPaintEngineEx::drawStaticTextItem(&staticTextItem);
    } else {
        QPaintEngineEx::drawTextItem(p, ti);
    }
}
 
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);
}
 
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);
    }
}
 
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);
    }
}
 
 
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
void QRasterPaintEngine::setDC(HDC hdc) {
    Q_D(QRasterPaintEngine);
    d->hdc = hdc;
}
 
HDC QRasterPaintEngine::getDC() const
{
    Q_D(const QRasterPaintEngine);
    return d->hdc;
}
 
void QRasterPaintEngine::releaseDC(HDC) const
{
}
 
#endif
 
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);
}
 
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;
 
    return QPaintEngineEx::shouldDrawCachedGlyphs(fontEngine, m);
}
 
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 = 256;
    QT_FT_Span spans[spanCount];
    int n = 0;
 
    // Boundaries
    int w = image.width();
    int h = image.height();
    int ymax = qMin(qRound(pos.y() + h), d->rasterBuffer->height());
    int ymin = qMax(qRound(pos.y()), 0);
    int xmax = qMin(qRound(pos.x() + w), d->rasterBuffer->width());
    int xmin = qMax(qRound(pos.x()), 0);
 
    int x_offset = xmin - qRound(pos.x());
 
    QImage::Format format = image.format();
    for (int y = ymin; y < ymax; ++y) {
        const uchar *src = image.scanLine(y - qRound(pos.y()));
        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;
    }
}
 
QRasterPaintEngine::ClipType QRasterPaintEngine::clipType() const
{
    Q_D(const QRasterPaintEngine);
 
    const QClipData *clip = d->clip();
    if (!clip || clip->hasRectClip)
        return RectClip;
    else
        return ComplexClip;
}
 
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 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;
    uchar rasterPoolOnStack[MINIMUM_POOL_SIZE + 0xf];
    uchar *rasterPoolBase = alignAddress(rasterPoolOnStack, 0xf);
    uchar *rasterPoolOnHeap = nullptr;
 
    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_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 += 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_ft_grays_raster.raster_done(*grayRaster.data());
            qt_ft_grays_raster.raster_new(grayRaster.data());
            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 a subset of destination format
    if (dFormat != sFormat && image.pixelFormat().alphaUsage() == QPixelFormat::IgnoresAlpha) {
        if ((sFormat == QImage::Format_RGB32 && dFormat == QImage::Format_ARGB32)
            || (sFormat == QImage::Format_RGBX8888 && dFormat == QImage::Format_RGBA8888)
            || (sFormat == QImage::Format_RGBX64 && dFormat == QImage::Format_RGBA64))
            sFormat = dFormat;
        else
            sFormat = qt_maybeAlphaVersionWithSameDepth(sFormat); // this returns premul formats
    }
    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(sizeof(ClipLine), clipSpanHeight);
 
    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 = (QSpan *)malloc(allocated * sizeof(QSpan));
                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];
                            QSpan *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 = (QSpan *)malloc(allocated * sizeof(QSpan));
            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) {
                    QSpan *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;
    }
 
}
 
static const QSpan *qt_intersect_spans(const QClipData *clip, int *currentClip,
                                       const QSpan *spans, const QSpan *end,
                                       QSpan **outSpans, int available)
{
    const_cast<QClipData *>(clip)->initialize();
 
    QSpan *out = *outSpans;
 
    const QSpan *clipSpans = clip->m_spans + *currentClip;
    const QSpan *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 QSpan *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 = 256;
    QSpan cspans[NSPANS];
    int currentClip = 0;
    const QSpan *end = spans + spanCount;
    while (spans < end) {
        QSpan *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 QSpan *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());
 
    QSpan *s = const_cast<QSpan *>(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 QSpan *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 QSpan *end = spans + count;
            while (spans < end) {
                QSpan *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((QSpan *)realloc(newClip->m_spans, newClip->allocated*2*sizeof(QSpan)));
                    newClip->allocated *= 2;
                }
            }
        }
        break;
 
    case Qt::ReplaceClip:
        clipData->newClip->appendSpans(spans, count);
        break;
    case Qt::NoClip:
        break;
    }
}
 
class QGradientCache
{
public:
    struct CacheInfo : QSpanData::Pinnable
    {
        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;
    };
 
    typedef QMultiHash<quint64, QSharedPointer<const CacheInfo>> QGradientColorTableHash;
 
    inline QSharedPointer<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;
    QSharedPointer<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 = QSharedPointer<CacheInfo>::create(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, 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.count();
    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)
{
    Qt::BrushStyle brushStyle = qbrush_style(brush);
    cachedGradient.reset();
    switch (brushStyle) {
    case Qt::SolidPattern: {
        type = Solid;
        QColor c = qbrush_color(brush);
        solidColor = qPremultiply(combineAlpha256(c.rgba64(), alpha));
        if (solidColor.isTransparent() && 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, QTextureData::Pattern);
        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();
}
 
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);
    }
}
 
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 QSpan *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