qpainter.cpp

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
// QtCore
#include <memory>
#include <qdebug.h>
#include <qmath.h>
#include <qmutex.h>
 
// QtGui
#include "qbitmap.h"
#include "qimage.h"
#include "qpaintdevice.h"
#include "qpaintengine.h"
#include "qpainter.h"
#include "qpainter_p.h"
#include "qpainterpath.h"
#include "qpicture.h"
#include "qpixmapcache.h"
#include "qpolygon.h"
#include "qtextlayout.h"
#include "qthread.h"
#include "qvarlengtharray.h"
#include "qstatictext.h"
#include "qglyphrun.h"
 
#include <qpa/qplatformtheme.h>
#include <qpa/qplatformintegration.h>
 
#include <private/qfontengine_p.h>
#include <private/qpaintengine_p.h>
#include <private/qemulationpaintengine_p.h>
#include <private/qpainterpath_p.h>
#include <private/qtextengine_p.h>
#include <private/qpaintengine_raster_p.h>
#include <private/qmath_p.h>
#include <private/qstatictext_p.h>
#include <private/qglyphrun_p.h>
#include <private/qhexstring_p.h>
#include <private/qguiapplication_p.h>
#include <private/qrawfont_p.h>
#include <private/qfont_p.h>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
// We changed the type from QScopedPointer to unique_ptr, make sure it's binary compatible:
static_assert(sizeof(QScopedPointer<QPainterPrivate>) == sizeof(std::unique_ptr<QPainterPrivate>));
 
#define QGradient_StretchToDevice 0x10000000
#define QPaintEngine_OpaqueBackground 0x40000000
 
// #define QT_DEBUG_DRAW
#ifdef QT_DEBUG_DRAW
bool qt_show_painter_debug_output = true;
#endif
 
extern QPixmap qt_pixmapForBrush(int style, bool invert);
 
void qt_format_text(const QFont &font,
                    const QRectF &_r, int tf, const QTextOption *option, const QString& str, QRectF *brect,
                    int tabstops, int* tabarray, int tabarraylen,
                    QPainter *painter);
static void drawTextItemDecoration(QPainter *painter, const QPointF &pos, const QFontEngine *fe, QTextEngine *textEngine,
                                   QTextCharFormat::UnderlineStyle underlineStyle,
                                   QTextItem::RenderFlags flags, qreal width,
                                   const QTextCharFormat &charFormat);
// Helper function to calculate left most position, width and flags for decoration drawing
static void qt_draw_decoration_for_glyphs(QPainter *painter,
                                          const QPointF &decorationPosition,
                                          const glyph_t *glyphArray,
                                          const QFixedPoint *positions,
                                          int glyphCount,
                                          QFontEngine *fontEngine,
                                          bool underline,
                                          bool overline,
                                          bool strikeOut);
 
static inline QGradient::CoordinateMode coordinateMode(const QBrush &brush)
{
    switch (brush.style()) {
    case Qt::LinearGradientPattern:
    case Qt::RadialGradientPattern:
    case Qt::ConicalGradientPattern:
        return brush.gradient()->coordinateMode();
    default:
        ;
    }
    return QGradient::LogicalMode;
}
 
extern bool qHasPixmapTexture(const QBrush &);
 
static inline bool is_brush_transparent(const QBrush &brush) {
    Qt::BrushStyle s = brush.style();
    if (s != Qt::TexturePattern)
        return s >= Qt::Dense1Pattern && s <= Qt::DiagCrossPattern;
    if (qHasPixmapTexture(brush))
        return brush.texture().isQBitmap() || brush.texture().hasAlphaChannel();
    else {
        const QImage texture = brush.textureImage();
        return texture.hasAlphaChannel() || (texture.depth() == 1 && texture.colorCount() == 0);
    }
}
 
static inline bool is_pen_transparent(const QPen &pen) {
    return pen.style() > Qt::SolidLine || is_brush_transparent(pen.brush());
}
 
/* Discards the emulation flags that are not relevant for line drawing
   and returns the result
*/
static inline uint line_emulation(uint emulation)
{
    return emulation & (QPaintEngine::PrimitiveTransform
                        | QPaintEngine::AlphaBlend
                        | QPaintEngine::Antialiasing
                        | QPaintEngine::BrushStroke
                        | QPaintEngine::ConstantOpacity
                        | QGradient_StretchToDevice
                        | QPaintEngine::ObjectBoundingModeGradients
                        | QPaintEngine_OpaqueBackground);
}
 
#ifndef QT_NO_DEBUG
static bool qt_painter_thread_test(int devType, int engineType, const char *what)
{
    const QPlatformIntegration *platformIntegration = QGuiApplicationPrivate::platformIntegration();
    switch (devType) {
    case QInternal::Image:
    case QInternal::Printer:
    case QInternal::Picture:
        // can be drawn onto these devices safely from any thread
        break;
    default:
        if (QThread::currentThread() != qApp->thread()
                // pixmaps cannot be targets unless threaded pixmaps are supported
                && (devType != QInternal::Pixmap || !platformIntegration->hasCapability(QPlatformIntegration::ThreadedPixmaps))
                // framebuffer objects and such cannot be targets unless threaded GL is supported
                && (devType != QInternal::OpenGL || !platformIntegration->hasCapability(QPlatformIntegration::ThreadedOpenGL))
                // widgets cannot be targets except for QGLWidget
                && (devType != QInternal::Widget || !platformIntegration->hasCapability(QPlatformIntegration::ThreadedOpenGL)
                    || (engineType != QPaintEngine::OpenGL && engineType != QPaintEngine::OpenGL2))) {
            qWarning("QPainter: It is not safe to use %s outside the GUI thread", what);
            return false;
        }
        break;
    }
    return true;
}
#endif
 
static bool needsEmulation(const QBrush &brush)
{
    bool res = false;
 
    const QGradient *bg = brush.gradient();
    if (bg) {
        res = (bg->coordinateMode() > QGradient::LogicalMode);
    } else if (brush.style() == Qt::TexturePattern) {
        if (qHasPixmapTexture(brush))
            res = !qFuzzyCompare(brush.texture().devicePixelRatio(), qreal(1.0));
        else
            res = !qFuzzyCompare(brush.textureImage().devicePixelRatio(), qreal(1.0));
    }
 
    return res;
}
 
void QPainterPrivate::checkEmulation()
{
    Q_ASSERT(extended);
    bool doEmulation = false;
    if (state->bgMode == Qt::OpaqueMode)
        doEmulation = true;
 
    if (needsEmulation(state->brush))
        doEmulation = true;
 
    if (needsEmulation(qpen_brush(state->pen)))
        doEmulation = true;
 
    if (doEmulation && extended->flags() & QPaintEngineEx::DoNotEmulate)
        return;
 
    if (doEmulation) {
        if (extended != emulationEngine.get()) {
            if (!emulationEngine)
                emulationEngine = std::make_unique<QEmulationPaintEngine>(extended);
            extended = emulationEngine.get();
            extended->setState(state.get());
        }
    } else if (emulationEngine.get() == extended) {
        extended = emulationEngine->real_engine;
    }
}
 
QPainterPrivate::QPainterPrivate(QPainter *painter)
    : q_ptr(painter), txinv(0), inDestructor(false)
{
}
 
QPainterPrivate::~QPainterPrivate()
    = default;
 
QTransform QPainterPrivate::viewTransform() const
{
    if (state->VxF) {
        qreal scaleW = qreal(state->vw)/qreal(state->ww);
        qreal scaleH = qreal(state->vh)/qreal(state->wh);
        return QTransform(scaleW, 0, 0, scaleH,
                          state->vx - state->wx*scaleW, state->vy - state->wy*scaleH);
    }
    return QTransform();
}
 
qreal QPainterPrivate::effectiveDevicePixelRatio() const
{
    // Special cases for devices that does not support PdmDevicePixelRatio go here:
    if (device->devType() == QInternal::Printer)
        return qreal(1);
 
    return qMax(qreal(1), device->devicePixelRatio());
}
 
QTransform QPainterPrivate::hidpiScaleTransform() const
{
    const qreal devicePixelRatio = effectiveDevicePixelRatio();
    return QTransform::fromScale(devicePixelRatio, devicePixelRatio);
}
 
/*
   \internal
   Returns \c true if using a shared painter; otherwise false.
*/
bool QPainterPrivate::attachPainterPrivate(QPainter *q, QPaintDevice *pdev)
{
    Q_ASSERT(q);
    Q_ASSERT(pdev);
 
    QPainter *sp = pdev->sharedPainter();
    if (!sp)
        return false;
 
    // Save the current state of the shared painter and assign
    // the current d_ptr to the shared painter's d_ptr.
    sp->save();
    ++sp->d_ptr->refcount;
    sp->d_ptr->d_ptrs.push_back(q->d_ptr.get());
    Q_UNUSED(q->d_ptr.release());
    q->d_ptr.reset(sp->d_ptr.get());
 
    Q_ASSERT(q->d_ptr->state);
 
    // Now initialize the painter with correct widget properties.
    q->d_ptr->initFrom(pdev);
    QPoint offset;
    pdev->redirected(&offset);
    offset += q->d_ptr->engine->coordinateOffset();
 
    // Update system rect.
    q->d_ptr->state->ww = q->d_ptr->state->vw = pdev->width();
    q->d_ptr->state->wh = q->d_ptr->state->vh = pdev->height();
 
    // Update matrix.
    if (q->d_ptr->state->WxF) {
        q->d_ptr->state->redirectionMatrix = q->d_ptr->state->matrix;
        q->d_ptr->state->redirectionMatrix *= q->d_ptr->hidpiScaleTransform().inverted();
        q->d_ptr->state->redirectionMatrix.translate(-offset.x(), -offset.y());
        q->d_ptr->state->worldMatrix = QTransform();
        q->d_ptr->state->WxF = false;
    } else {
        q->d_ptr->state->redirectionMatrix = QTransform::fromTranslate(-offset.x(), -offset.y());
    }
    q->d_ptr->updateMatrix();
 
    QPaintEnginePrivate *enginePrivate = q->d_ptr->engine->d_func();
    if (enginePrivate->currentClipDevice == pdev) {
        enginePrivate->systemStateChanged();
        return true;
    }
 
    // Update system transform and clip.
    enginePrivate->currentClipDevice = pdev;
    enginePrivate->setSystemTransform(q->d_ptr->state->matrix);
    return true;
}
 
void QPainterPrivate::detachPainterPrivate(QPainter *q)
{
    Q_ASSERT(refcount > 1);
    Q_ASSERT(q);
 
    --refcount;
    QPainterPrivate *original = d_ptrs.back();
    d_ptrs.pop_back();
    if (inDestructor) {
        inDestructor = false;
        if (original)
            original->inDestructor = true;
    } else if (!original) {
        original = new QPainterPrivate(q);
    }
 
    q->restore();
    Q_UNUSED(q->d_ptr.release());
    q->d_ptr.reset(original);
 
    if (emulationEngine) {
        extended = emulationEngine->real_engine;
        emulationEngine = nullptr;
    }
}
 
 
void QPainterPrivate::draw_helper(const QPainterPath &originalPath, DrawOperation op)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output) {
        printf("QPainter::drawHelper\n");
    }
#endif
 
    if (originalPath.isEmpty())
        return;
 
    QPaintEngine::PaintEngineFeatures gradientStretch =
        QPaintEngine::PaintEngineFeatures(QGradient_StretchToDevice
                                          | QPaintEngine::ObjectBoundingModeGradients);
 
    const bool mustEmulateObjectBoundingModeGradients = extended
                                                        || ((state->emulationSpecifier & QPaintEngine::ObjectBoundingModeGradients)
                                                            && !engine->hasFeature(QPaintEngine::PatternTransform));
 
    if (!(state->emulationSpecifier & ~gradientStretch)
        && !mustEmulateObjectBoundingModeGradients) {
        drawStretchedGradient(originalPath, op);
        return;
    } else if (state->emulationSpecifier & QPaintEngine_OpaqueBackground) {
        drawOpaqueBackground(originalPath, op);
        return;
    }
 
    Q_Q(QPainter);
 
    qreal strokeOffsetX = 0, strokeOffsetY = 0;
 
    QPainterPath path = originalPath * state->matrix;
    QRectF pathBounds = path.boundingRect();
    QRectF strokeBounds;
    bool doStroke = (op & StrokeDraw) && (state->pen.style() != Qt::NoPen);
    if (doStroke) {
        qreal penWidth = state->pen.widthF();
        if (penWidth == 0) {
            strokeOffsetX = 1;
            strokeOffsetY = 1;
        } else {
            // In case of complex xform
            if (state->matrix.type() > QTransform::TxScale) {
                QPainterPathStroker stroker;
                stroker.setWidth(penWidth);
                stroker.setJoinStyle(state->pen.joinStyle());
                stroker.setCapStyle(state->pen.capStyle());
                QPainterPath stroke = stroker.createStroke(originalPath);
                strokeBounds = (stroke * state->matrix).boundingRect();
            } else {
                strokeOffsetX = qAbs(penWidth * state->matrix.m11() / 2.0);
                strokeOffsetY = qAbs(penWidth * state->matrix.m22() / 2.0);
            }
        }
    }
 
    QRect absPathRect;
    if (!strokeBounds.isEmpty()) {
        absPathRect = strokeBounds.intersected(QRectF(0, 0, device->width(), device->height())).toAlignedRect();
    } else {
        absPathRect = pathBounds.adjusted(-strokeOffsetX, -strokeOffsetY, strokeOffsetX, strokeOffsetY)
            .intersected(QRectF(0, 0, device->width(), device->height())).toAlignedRect();
    }
 
    if (q->hasClipping()) {
        bool hasPerspectiveTransform = false;
        for (const QPainterClipInfo &info : std::as_const(state->clipInfo)) {
            if (info.matrix.type() == QTransform::TxProject) {
                hasPerspectiveTransform = true;
                break;
            }
        }
        // avoid mapping QRegions with perspective transforms
        if (!hasPerspectiveTransform) {
            // The trick with txinv and invMatrix is done in order to
            // avoid transforming the clip to logical coordinates, and
            // then back to device coordinates. This is a problem with
            // QRegion/QRect based clips, since they use integer
            // coordinates and converting to/from logical coordinates will
            // lose precision.
            bool old_txinv = txinv;
            QTransform old_invMatrix = invMatrix;
            txinv = true;
            invMatrix = QTransform();
            QPainterPath clipPath = q->clipPath();
            QRectF r = clipPath.boundingRect().intersected(absPathRect);
            absPathRect = r.toAlignedRect();
            txinv = old_txinv;
            invMatrix = old_invMatrix;
        }
    }
 
//     qDebug("\nQPainterPrivate::draw_helper(), x=%d, y=%d, w=%d, h=%d",
//            devMinX, devMinY, device->width(), device->height());
//     qDebug() << " - matrix" << state->matrix;
//     qDebug() << " - originalPath.bounds" << originalPath.boundingRect();
//     qDebug() << " - path.bounds" << path.boundingRect();
 
    if (absPathRect.width() <= 0 || absPathRect.height() <= 0)
        return;
 
    QImage image(absPathRect.width(), absPathRect.height(), QImage::Format_ARGB32_Premultiplied);
    image.fill(0);
 
    QPainter p(&image);
 
    p.d_ptr->helper_device = helper_device;
 
    p.setOpacity(state->opacity);
    p.translate(-absPathRect.x(), -absPathRect.y());
    p.setTransform(state->matrix, true);
    p.setPen(doStroke ? state->pen : QPen(Qt::NoPen));
    p.setBrush((op & FillDraw) ? state->brush : QBrush(Qt::NoBrush));
    p.setBackground(state->bgBrush);
    p.setBackgroundMode(state->bgMode);
    p.setBrushOrigin(state->brushOrigin);
 
    p.setRenderHint(QPainter::Antialiasing, state->renderHints & QPainter::Antialiasing);
    p.setRenderHint(QPainter::SmoothPixmapTransform,
                    state->renderHints & QPainter::SmoothPixmapTransform);
 
    p.drawPath(originalPath);
 
#ifndef QT_NO_DEBUG
    static bool do_fallback_overlay = !qEnvironmentVariableIsEmpty("QT_PAINT_FALLBACK_OVERLAY");
    if (do_fallback_overlay) {
        QImage block(8, 8, QImage::Format_ARGB32_Premultiplied);
        QPainter pt(&block);
        pt.fillRect(0, 0, 8, 8, QColor(196, 0, 196));
        pt.drawLine(0, 0, 8, 8);
        pt.end();
        p.resetTransform();
        p.setCompositionMode(QPainter::CompositionMode_SourceAtop);
        p.setOpacity(0.5);
        p.fillRect(0, 0, image.width(), image.height(), QBrush(block));
    }
#endif
 
    p.end();
 
    q->save();
    state->matrix = QTransform();
    if (extended) {
        extended->transformChanged();
    } else {
        state->dirtyFlags |= QPaintEngine::DirtyTransform;
        updateState(state);
    }
    engine->drawImage(absPathRect,
                 image,
                 QRectF(0, 0, absPathRect.width(), absPathRect.height()),
                 Qt::OrderedDither | Qt::OrderedAlphaDither);
    q->restore();
}
 
void QPainterPrivate::drawOpaqueBackground(const QPainterPath &path, DrawOperation op)
{
    Q_Q(QPainter);
 
    q->setBackgroundMode(Qt::TransparentMode);
 
    if (op & FillDraw && state->brush.style() != Qt::NoBrush) {
        q->fillPath(path, state->bgBrush.color());
        q->fillPath(path, state->brush);
    }
 
    if (op & StrokeDraw && state->pen.style() != Qt::NoPen) {
        q->strokePath(path, QPen(state->bgBrush.color(), state->pen.width()));
        q->strokePath(path, state->pen);
    }
 
    q->setBackgroundMode(Qt::OpaqueMode);
}
 
static inline QBrush stretchGradientToUserSpace(const QBrush &brush, const QRectF &boundingRect)
{
    Q_ASSERT(brush.style() >= Qt::LinearGradientPattern
             && brush.style() <= Qt::ConicalGradientPattern);
 
    QTransform gradientToUser(boundingRect.width(), 0, 0, boundingRect.height(),
                              boundingRect.x(), boundingRect.y());
 
    QGradient g = *brush.gradient();
    g.setCoordinateMode(QGradient::LogicalMode);
 
    QBrush b(g);
    if (brush.gradient()->coordinateMode() == QGradient::ObjectMode)
        b.setTransform(b.transform() * gradientToUser);
    else
        b.setTransform(gradientToUser * b.transform());
    return b;
}
 
void QPainterPrivate::drawStretchedGradient(const QPainterPath &path, DrawOperation op)
{
    Q_Q(QPainter);
 
    const qreal sw = helper_device->width();
    const qreal sh = helper_device->height();
 
    bool changedPen = false;
    bool changedBrush = false;
    bool needsFill = false;
 
    const QPen pen = state->pen;
    const QBrush brush = state->brush;
 
    const QGradient::CoordinateMode penMode = coordinateMode(pen.brush());
    const QGradient::CoordinateMode brushMode = coordinateMode(brush);
 
    QRectF boundingRect;
 
    // Draw the xformed fill if the brush is a stretch gradient.
    if ((op & FillDraw) && brush.style() != Qt::NoBrush) {
        if (brushMode == QGradient::StretchToDeviceMode) {
            q->setPen(Qt::NoPen);
            changedPen = pen.style() != Qt::NoPen;
            q->scale(sw, sh);
            updateState(state);
 
            const qreal isw = 1.0 / sw;
            const qreal ish = 1.0 / sh;
            QTransform inv(isw, 0, 0, ish, 0, 0);
            engine->drawPath(path * inv);
            q->scale(isw, ish);
        } else {
            needsFill = true;
 
            if (brushMode == QGradient::ObjectBoundingMode || brushMode == QGradient::ObjectMode) {
                Q_ASSERT(engine->hasFeature(QPaintEngine::PatternTransform));
                boundingRect = path.boundingRect();
                q->setBrush(stretchGradientToUserSpace(brush, boundingRect));
                changedBrush = true;
            }
        }
    }
 
    if ((op & StrokeDraw) && pen.style() != Qt::NoPen) {
        // Draw the xformed outline if the pen is a stretch gradient.
        if (penMode == QGradient::StretchToDeviceMode) {
            q->setPen(Qt::NoPen);
            changedPen = true;
 
            if (needsFill) {
                updateState(state);
                engine->drawPath(path);
            }
 
            q->scale(sw, sh);
            q->setBrush(pen.brush());
            changedBrush = true;
            updateState(state);
 
            QPainterPathStroker stroker;
            stroker.setDashPattern(pen.style());
            stroker.setWidth(pen.widthF());
            stroker.setJoinStyle(pen.joinStyle());
            stroker.setCapStyle(pen.capStyle());
            stroker.setMiterLimit(pen.miterLimit());
            QPainterPath stroke = stroker.createStroke(path);
 
            const qreal isw = 1.0 / sw;
            const qreal ish = 1.0 / sh;
            QTransform inv(isw, 0, 0, ish, 0, 0);
            engine->drawPath(stroke * inv);
            q->scale(isw, ish);
        } else {
            if (!needsFill && brush.style() != Qt::NoBrush) {
                q->setBrush(Qt::NoBrush);
                changedBrush = true;
            }
 
            if (penMode == QGradient::ObjectBoundingMode || penMode == QGradient::ObjectMode) {
                Q_ASSERT(engine->hasFeature(QPaintEngine::PatternTransform));
 
                // avoid computing the bounding rect twice
                if (!needsFill || (brushMode != QGradient::ObjectBoundingMode && brushMode != QGradient::ObjectMode))
                    boundingRect = path.boundingRect();
 
                QPen p = pen;
                p.setBrush(stretchGradientToUserSpace(pen.brush(), boundingRect));
                q->setPen(p);
                changedPen = true;
            } else if (changedPen) {
                q->setPen(pen);
                changedPen = false;
            }
 
            updateState(state);
            engine->drawPath(path);
        }
    } else if (needsFill) {
        if (pen.style() != Qt::NoPen) {
            q->setPen(Qt::NoPen);
            changedPen = true;
        }
 
        updateState(state);
        engine->drawPath(path);
    }
 
    if (changedPen)
        q->setPen(pen);
    if (changedBrush)
        q->setBrush(brush);
}
 
 
void QPainterPrivate::updateMatrix()
{
    state->matrix = state->WxF ? state->worldMatrix : QTransform();
    if (state->VxF)
        state->matrix *= viewTransform();
 
    txinv = false;                                // no inverted matrix
    state->matrix *= state->redirectionMatrix;
    if (extended)
        extended->transformChanged();
    else
        state->dirtyFlags |= QPaintEngine::DirtyTransform;
 
    state->matrix *= hidpiScaleTransform();
 
//     printf("VxF=%d, WxF=%d\n", state->VxF, state->WxF);
//     qDebug() << " --- using matrix" << state->matrix << redirection_offset;
}
 
void QPainterPrivate::updateInvMatrix()
{
    Q_ASSERT(txinv == false);
    txinv = true;                                // creating inverted matrix
    invMatrix = state->matrix.inverted();
}
 
extern bool qt_isExtendedRadialGradient(const QBrush &brush);
 
void QPainterPrivate::updateEmulationSpecifier(QPainterState *s)
{
    bool alpha = false;
    bool linearGradient = false;
    bool radialGradient = false;
    bool extendedRadialGradient = false;
    bool conicalGradient = false;
    bool patternBrush = false;
    bool xform = false;
    bool complexXform = false;
 
    bool skip = true;
 
    // Pen and brush properties (we have to check both if one changes because the
    // one that's unchanged can still be in a state which requires emulation)
    if (s->state() & (QPaintEngine::DirtyPen | QPaintEngine::DirtyBrush | QPaintEngine::DirtyHints)) {
        // Check Brush stroke emulation
        if (!s->pen.isSolid() && !engine->hasFeature(QPaintEngine::BrushStroke))
            s->emulationSpecifier |= QPaintEngine::BrushStroke;
        else
            s->emulationSpecifier &= ~QPaintEngine::BrushStroke;
 
        skip = false;
 
        QBrush penBrush = (qpen_style(s->pen) == Qt::NoPen) ? QBrush(Qt::NoBrush) : qpen_brush(s->pen);
        Qt::BrushStyle brushStyle = qbrush_style(s->brush);
        Qt::BrushStyle penBrushStyle = qbrush_style(penBrush);
        alpha = (penBrushStyle != Qt::NoBrush
                 && (penBrushStyle < Qt::LinearGradientPattern && penBrush.color().alpha() != 255)
                 && !penBrush.isOpaque())
                || (brushStyle != Qt::NoBrush
                    && (brushStyle < Qt::LinearGradientPattern && s->brush.color().alpha() != 255)
                    && !s->brush.isOpaque());
        linearGradient = ((penBrushStyle == Qt::LinearGradientPattern) ||
                           (brushStyle == Qt::LinearGradientPattern));
        radialGradient = ((penBrushStyle == Qt::RadialGradientPattern) ||
                           (brushStyle == Qt::RadialGradientPattern));
        extendedRadialGradient = radialGradient && (qt_isExtendedRadialGradient(penBrush) || qt_isExtendedRadialGradient(s->brush));
        conicalGradient = ((penBrushStyle == Qt::ConicalGradientPattern) ||
                            (brushStyle == Qt::ConicalGradientPattern));
        patternBrush = (((penBrushStyle > Qt::SolidPattern
                           && penBrushStyle < Qt::LinearGradientPattern)
                          || penBrushStyle == Qt::TexturePattern) ||
                         ((brushStyle > Qt::SolidPattern
                           && brushStyle < Qt::LinearGradientPattern)
                          || brushStyle == Qt::TexturePattern));
 
        bool penTextureAlpha = false;
        if (penBrush.style() == Qt::TexturePattern)
            penTextureAlpha = qHasPixmapTexture(penBrush)
                              ? (penBrush.texture().depth() > 1) && penBrush.texture().hasAlpha()
                              : penBrush.textureImage().hasAlphaChannel();
        bool brushTextureAlpha = false;
        if (s->brush.style() == Qt::TexturePattern) {
            brushTextureAlpha = qHasPixmapTexture(s->brush)
                                ? (s->brush.texture().depth() > 1) && s->brush.texture().hasAlpha()
                                : s->brush.textureImage().hasAlphaChannel();
        }
        if (((penBrush.style() == Qt::TexturePattern && penTextureAlpha)
             || (s->brush.style() == Qt::TexturePattern && brushTextureAlpha))
            && !engine->hasFeature(QPaintEngine::MaskedBrush))
            s->emulationSpecifier |= QPaintEngine::MaskedBrush;
        else
            s->emulationSpecifier &= ~QPaintEngine::MaskedBrush;
    }
 
    if (s->state() & (QPaintEngine::DirtyHints
                      | QPaintEngine::DirtyOpacity
                      | QPaintEngine::DirtyBackgroundMode)) {
        skip = false;
    }
 
    if (skip)
        return;
 
#if 0
    qDebug("QPainterPrivate::updateEmulationSpecifier, state=%p\n"
           " - alpha: %d\n"
           " - linearGradient: %d\n"
           " - radialGradient: %d\n"
           " - conicalGradient: %d\n"
           " - patternBrush: %d\n"
           " - hints: %x\n"
           " - xform: %d\n",
           s,
           alpha,
           linearGradient,
           radialGradient,
           conicalGradient,
           patternBrush,
           uint(s->renderHints),
           xform);
#endif
 
    // XForm properties
    if (s->state() & QPaintEngine::DirtyTransform) {
        xform = !s->matrix.isIdentity();
        complexXform = !s->matrix.isAffine();
    } else if (s->matrix.type() >= QTransform::TxTranslate) {
        xform = true;
        complexXform = !s->matrix.isAffine();
    }
 
    const bool brushXform = (s->brush.transform().type() != QTransform::TxNone);
    const bool penXform = (s->pen.brush().transform().type() != QTransform::TxNone);
 
    const bool patternXform = patternBrush && (xform || brushXform || penXform);
 
    // Check alphablending
    if (alpha && !engine->hasFeature(QPaintEngine::AlphaBlend))
        s->emulationSpecifier |= QPaintEngine::AlphaBlend;
    else
        s->emulationSpecifier &= ~QPaintEngine::AlphaBlend;
 
    // Linear gradient emulation
    if (linearGradient && !engine->hasFeature(QPaintEngine::LinearGradientFill))
        s->emulationSpecifier |= QPaintEngine::LinearGradientFill;
    else
        s->emulationSpecifier &= ~QPaintEngine::LinearGradientFill;
 
    // Radial gradient emulation
    if (extendedRadialGradient || (radialGradient && !engine->hasFeature(QPaintEngine::RadialGradientFill)))
        s->emulationSpecifier |= QPaintEngine::RadialGradientFill;
    else
        s->emulationSpecifier &= ~QPaintEngine::RadialGradientFill;
 
    // Conical gradient emulation
    if (conicalGradient && !engine->hasFeature(QPaintEngine::ConicalGradientFill))
        s->emulationSpecifier |= QPaintEngine::ConicalGradientFill;
    else
        s->emulationSpecifier &= ~QPaintEngine::ConicalGradientFill;
 
    // Pattern brushes
    if (patternBrush && !engine->hasFeature(QPaintEngine::PatternBrush))
        s->emulationSpecifier |= QPaintEngine::PatternBrush;
    else
        s->emulationSpecifier &= ~QPaintEngine::PatternBrush;
 
    // Pattern XForms
    if (patternXform && !engine->hasFeature(QPaintEngine::PatternTransform))
        s->emulationSpecifier |= QPaintEngine::PatternTransform;
    else
        s->emulationSpecifier &= ~QPaintEngine::PatternTransform;
 
    // Primitive XForms
    if (xform && !engine->hasFeature(QPaintEngine::PrimitiveTransform))
        s->emulationSpecifier |= QPaintEngine::PrimitiveTransform;
    else
        s->emulationSpecifier &= ~QPaintEngine::PrimitiveTransform;
 
    // Perspective XForms
    if (complexXform && !engine->hasFeature(QPaintEngine::PerspectiveTransform))
        s->emulationSpecifier |= QPaintEngine::PerspectiveTransform;
    else
        s->emulationSpecifier &= ~QPaintEngine::PerspectiveTransform;
 
    // Constant opacity
    if (state->opacity != 1 && !engine->hasFeature(QPaintEngine::ConstantOpacity))
        s->emulationSpecifier |= QPaintEngine::ConstantOpacity;
    else
        s->emulationSpecifier &= ~QPaintEngine::ConstantOpacity;
 
    bool gradientStretch = false;
    bool objectBoundingMode = false;
    if (linearGradient || conicalGradient || radialGradient) {
        QGradient::CoordinateMode brushMode = coordinateMode(s->brush);
        QGradient::CoordinateMode penMode = coordinateMode(s->pen.brush());
 
        gradientStretch |= (brushMode == QGradient::StretchToDeviceMode);
        gradientStretch |= (penMode == QGradient::StretchToDeviceMode);
 
        objectBoundingMode |= (brushMode == QGradient::ObjectBoundingMode || brushMode == QGradient::ObjectMode);
        objectBoundingMode |= (penMode == QGradient::ObjectBoundingMode || penMode == QGradient::ObjectMode);
    }
    if (gradientStretch)
        s->emulationSpecifier |= QGradient_StretchToDevice;
    else
        s->emulationSpecifier &= ~QGradient_StretchToDevice;
 
    if (objectBoundingMode && !engine->hasFeature(QPaintEngine::ObjectBoundingModeGradients))
        s->emulationSpecifier |= QPaintEngine::ObjectBoundingModeGradients;
    else
        s->emulationSpecifier &= ~QPaintEngine::ObjectBoundingModeGradients;
 
    // Opaque backgrounds...
    if (s->bgMode == Qt::OpaqueMode &&
        (is_pen_transparent(s->pen) || is_brush_transparent(s->brush)))
        s->emulationSpecifier |= QPaintEngine_OpaqueBackground;
    else
        s->emulationSpecifier &= ~QPaintEngine_OpaqueBackground;
 
#if 0
    //won't be correct either way because the device can already have
    // something rendered to it in which case subsequent emulation
    // on a fully transparent qimage and then blitting the results
    // won't produce correct results
    // Blend modes
    if (state->composition_mode > QPainter::CompositionMode_Xor &&
        !engine->hasFeature(QPaintEngine::BlendModes))
        s->emulationSpecifier |= QPaintEngine::BlendModes;
    else
        s->emulationSpecifier &= ~QPaintEngine::BlendModes;
#endif
}
 
void QPainterPrivate::updateStateImpl(QPainterState *newState)
{
    // ### we might have to call QPainter::begin() here...
    if (!engine->state) {
        engine->state = newState;
        engine->setDirty(QPaintEngine::AllDirty);
    }
 
    if (engine->state->painter() != newState->painter)
        // ### this could break with clip regions vs paths.
        engine->setDirty(QPaintEngine::AllDirty);
 
    // Upon restore, revert all changes since last save
    else if (engine->state != newState)
        newState->dirtyFlags |= QPaintEngine::DirtyFlags(static_cast<QPainterState *>(engine->state)->changeFlags);
 
    // We need to store all changes made so that restore can deal with them
    else
        newState->changeFlags |= newState->dirtyFlags;
 
    updateEmulationSpecifier(newState);
 
    // Unset potential dirty background mode
    newState->dirtyFlags &= ~(QPaintEngine::DirtyBackgroundMode
            | QPaintEngine::DirtyBackground);
 
    engine->state = newState;
    engine->updateState(*newState);
    engine->clearDirty(QPaintEngine::AllDirty);
 
}
 
void QPainterPrivate::updateState(QPainterState *newState)
{
 
    if (!newState) {
        engine->state = newState;
    } else if (newState->state() || engine->state!=newState) {
        updateStateImpl(newState);
    }
}
 
 
QPainter::QPainter()
    : d_ptr(new QPainterPrivate(this))
{
}
 
QPainter::QPainter(QPaintDevice *pd)
    : d_ptr(nullptr)
{
    Q_ASSERT(pd != nullptr);
    if (!QPainterPrivate::attachPainterPrivate(this, pd)) {
        d_ptr.reset(new QPainterPrivate(this));
        begin(pd);
    }
    Q_ASSERT(d_ptr);
}
 
QPainter::~QPainter()
{
    d_ptr->inDestructor = true;
    QT_TRY {
        if (isActive())
            end();
        else if (d_ptr->refcount > 1)
            d_ptr->detachPainterPrivate(this);
    } QT_CATCH(...) {
        // don't throw anything in the destructor.
    }
    if (d_ptr) {
        // Make sure we haven't messed things up.
        Q_ASSERT(d_ptr->inDestructor);
        d_ptr->inDestructor = false;
        Q_ASSERT(d_ptr->refcount == 1);
    }
}
 
QPaintDevice *QPainter::device() const
{
    Q_D(const QPainter);
    if (isActive() && d->engine->d_func()->currentClipDevice)
        return d->engine->d_func()->currentClipDevice;
    return d->original_device;
}
 
bool QPainter::isActive() const
{
    Q_D(const QPainter);
    return d->engine != nullptr;
}
 
void QPainterPrivate::initFrom(const QPaintDevice *device)
{
    if (!engine) {
        qWarning("QPainter::initFrom: Painter not active, aborted");
        return;
    }
 
    Q_Q(QPainter);
    device->initPainter(q);
 
    if (extended) {
        extended->penChanged();
    } else if (engine) {
        engine->setDirty(QPaintEngine::DirtyPen);
        engine->setDirty(QPaintEngine::DirtyBrush);
        engine->setDirty(QPaintEngine::DirtyFont);
    }
}
 
void QPainter::save()
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::save()\n");
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::save: Painter not active");
        return;
    }
 
    std::unique_ptr<QPainterState> prev;
    if (d->extended) {
        // separate the creation of a new state from the update of d->state, since some
        // engines access d->state directly (not via createState()'s argument)
        std::unique_ptr<QPainterState> next(d->extended->createState(d->state.get()));
        prev = std::exchange(d->state, std::move(next));
        d->extended->setState(d->state.get());
    } else {
        d->updateState(d->state);
        prev = std::exchange(d->state, std::make_unique<QPainterState>(d->state.get()));
        d->engine->state = d->state.get();
    }
    d->savedStates.push(std::move(prev));
}
 
void QPainter::restore()
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::restore()\n");
#endif
    Q_D(QPainter);
    if (d->savedStates.empty()) {
        qWarning("QPainter::restore: Unbalanced save/restore");
        return;
    } else if (!d->engine) {
        qWarning("QPainter::restore: Painter not active");
        return;
    }
 
    const auto tmp = std::exchange(d->state, std::move(d->savedStates.top()));
    d->savedStates.pop();
    d->txinv = false;
 
    if (d->extended) {
        d->checkEmulation();
        d->extended->setState(d->state.get());
        return;
    }
 
    // trigger clip update if the clip path/region has changed since
    // last save
    if (!d->state->clipInfo.isEmpty()
        && (tmp->changeFlags & (QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipPath))) {
        // reuse the tmp state to avoid any extra allocs...
        tmp->dirtyFlags = QPaintEngine::DirtyClipPath;
        tmp->clipOperation = Qt::NoClip;
        tmp->clipPath = QPainterPath();
        d->engine->updateState(*tmp);
        // replay the list of clip states,
        for (const QPainterClipInfo &info : std::as_const(d->state->clipInfo)) {
            tmp->matrix = info.matrix;
            tmp->clipOperation = info.operation;
            if (info.clipType == QPainterClipInfo::RectClip) {
                tmp->dirtyFlags = QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyTransform;
                tmp->clipRegion = info.rect;
            } else if (info.clipType == QPainterClipInfo::RegionClip) {
                tmp->dirtyFlags = QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyTransform;
                tmp->clipRegion = info.region;
            } else { // clipType == QPainterClipInfo::PathClip
                tmp->dirtyFlags = QPaintEngine::DirtyClipPath | QPaintEngine::DirtyTransform;
                tmp->clipPath = info.path;
            }
            d->engine->updateState(*tmp);
        }
 
 
        //Since we've updated the clip region anyway, pretend that the clip path hasn't changed:
        d->state->dirtyFlags &= ~(QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipRegion);
        tmp->changeFlags &= ~uint(QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipRegion);
        tmp->changeFlags |= QPaintEngine::DirtyTransform;
    }
 
    d->updateState(d->state.get());
}
 
 
static inline void qt_cleanup_painter_state(QPainterPrivate *d)
{
    d->savedStates.clear();
    d->state = nullptr;
    d->engine = nullptr;
    d->device = nullptr;
}
 
bool QPainter::begin(QPaintDevice *pd)
{
    Q_ASSERT(pd);
 
    if (pd->painters > 0) {
        qWarning("QPainter::begin: A paint device can only be painted by one painter at a time.");
        return false;
    }
 
    if (d_ptr->engine) {
        qWarning("QPainter::begin: Painter already active");
        return false;
    }
 
    if (QPainterPrivate::attachPainterPrivate(this, pd))
        return true;
 
    Q_D(QPainter);
 
    d->helper_device = pd;
    d->original_device = pd;
 
    QPoint redirectionOffset;
    QPaintDevice *rpd = pd->redirected(&redirectionOffset);
    if (rpd)
        pd = rpd;
 
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::begin(), device=%p, type=%d\n", pd, pd->devType());
#endif
 
    if (pd->devType() == QInternal::Pixmap)
        static_cast<QPixmap *>(pd)->detach();
    else if (pd->devType() == QInternal::Image)
        static_cast<QImage *>(pd)->detach();
 
    d->engine.reset(pd->paintEngine());
 
    if (!d->engine) {
        qWarning("QPainter::begin: Paint device returned engine == 0, type: %d", pd->devType());
        return false;
    }
 
    d->device = pd;
 
    d->extended = d->engine->isExtended() ? static_cast<QPaintEngineEx *>(d->engine.get()) : nullptr;
    if (d->emulationEngine)
        d->emulationEngine->real_engine = d->extended;
 
    // Setup new state...
    Q_ASSERT(!d->state);
    d->state.reset(d->extended ? d->extended->createState(nullptr) : new QPainterState);
    d->state->painter = this;
 
    d->state->redirectionMatrix.translate(-redirectionOffset.x(), -redirectionOffset.y());
    d->state->brushOrigin = QPointF();
 
    // Slip a painter state into the engine before we do any other operations
    if (d->extended)
        d->extended->setState(d->state.get());
    else
        d->engine->state = d->state.get();
 
    switch (pd->devType()) {
        case QInternal::Pixmap:
        {
            QPixmap *pm = static_cast<QPixmap *>(pd);
            Q_ASSERT(pm);
            if (pm->isNull()) {
                qWarning("QPainter::begin: Cannot paint on a null pixmap");
                qt_cleanup_painter_state(d);
                return false;
            }
 
            if (pm->depth() == 1) {
                d->state->pen = QPen(Qt::color1);
                d->state->brush = QBrush(Qt::color0);
            }
            break;
        }
        case QInternal::Image:
        {
            QImage *img = static_cast<QImage *>(pd);
            Q_ASSERT(img);
            if (img->isNull()) {
                qWarning("QPainter::begin: Cannot paint on a null image");
                qt_cleanup_painter_state(d);
                return false;
            } else if (img->format() == QImage::Format_Indexed8) {
                // Painting on indexed8 images is not supported.
                qWarning("QPainter::begin: Cannot paint on an image with the QImage::Format_Indexed8 format");
                qt_cleanup_painter_state(d);
                return false;
            }
            if (img->depth() == 1) {
                d->state->pen = QPen(Qt::color1);
                d->state->brush = QBrush(Qt::color0);
            }
            break;
        }
        default:
            break;
    }
    if (d->state->ww == 0) // For compat with 3.x painter defaults
        d->state->ww = d->state->wh = d->state->vw = d->state->vh = 1024;
 
    d->engine->setPaintDevice(pd);
 
    bool begun = d->engine->begin(pd);
    if (!begun) {
        qWarning("QPainter::begin(): Returned false");
        if (d->engine->isActive()) {
            end();
        } else {
            qt_cleanup_painter_state(d);
        }
        return false;
    } else {
        d->engine->setActive(begun);
    }
 
    // Copy painter properties from original paint device,
    // required for QPixmap::grabWidget()
    if (d->original_device->devType() == QInternal::Widget) {
        d->initFrom(d->original_device);
    } else {
        d->state->layoutDirection = Qt::LayoutDirectionAuto;
        // make sure we have a font compatible with the paintdevice
        d->state->deviceFont = d->state->font = QFont(d->state->deviceFont, device());
    }
 
    QRect systemRect = d->engine->systemRect();
    if (!systemRect.isEmpty()) {
        d->state->ww = d->state->vw = systemRect.width();
        d->state->wh = d->state->vh = systemRect.height();
    } else {
        d->state->ww = d->state->vw = pd->metric(QPaintDevice::PdmWidth);
        d->state->wh = d->state->vh = pd->metric(QPaintDevice::PdmHeight);
    }
 
    const QPoint coordinateOffset = d->engine->coordinateOffset();
    d->state->redirectionMatrix.translate(-coordinateOffset.x(), -coordinateOffset.y());
 
    Q_ASSERT(d->engine->isActive());
 
    if (!d->state->redirectionMatrix.isIdentity() || d->effectiveDevicePixelRatio() > 1)
        d->updateMatrix();
 
    Q_ASSERT(d->engine->isActive());
    d->state->renderHints = QPainter::TextAntialiasing;
    ++d->device->painters;
 
    d->state->emulationSpecifier = 0;
 
    return true;
}
 
bool QPainter::end()
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::end()\n");
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::end: Painter not active, aborted");
        qt_cleanup_painter_state(d);
        return false;
    }
 
    if (d->refcount > 1) {
        d->detachPainterPrivate(this);
        return true;
    }
 
    bool ended = true;
 
    if (d->engine->isActive()) {
        ended = d->engine->end();
        d->updateState(nullptr);
 
        --d->device->painters;
        if (d->device->painters == 0) {
            d->engine->setPaintDevice(nullptr);
            d->engine->setActive(false);
        }
    }
 
    if (d->savedStates.size() > 0) {
        qWarning("QPainter::end: Painter ended with %d saved states", int(d->savedStates.size()));
    }
 
    d->engine.reset();
    d->emulationEngine = nullptr;
    d->extended = nullptr;
 
    qt_cleanup_painter_state(d);
 
    return ended;
}
 
 
QPaintEngine *QPainter::paintEngine() const
{
    Q_D(const QPainter);
    return d->engine.get();
}
 
void QPainter::beginNativePainting()
{
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::beginNativePainting: Painter not active");
        return;
    }
 
    if (d->extended)
        d->extended->beginNativePainting();
}
 
void QPainter::endNativePainting()
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::beginNativePainting: Painter not active");
        return;
    }
 
    if (d->extended)
        d->extended->endNativePainting();
    else
        d->engine->syncState();
}
 
QFontMetrics QPainter::fontMetrics() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::fontMetrics: Painter not active");
        return QFontMetrics(QFont());
    }
    return QFontMetrics(d->state->font);
}
 
 
QFontInfo QPainter::fontInfo() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::fontInfo: Painter not active");
        return QFontInfo(QFont());
    }
    return QFontInfo(d->state->font);
}
 
qreal QPainter::opacity() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::opacity: Painter not active");
        return 1.0;
    }
    return d->state->opacity;
}
 
void QPainter::setOpacity(qreal opacity)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setOpacity: Painter not active");
        return;
    }
 
    opacity = qMin(qreal(1), qMax(qreal(0), opacity));
 
    if (opacity == d->state->opacity)
        return;
 
    d->state->opacity = opacity;
 
    if (d->extended)
        d->extended->opacityChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyOpacity;
}
 
 
QPoint QPainter::brushOrigin() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::brushOrigin: Painter not active");
        return QPoint();
    }
    return QPointF(d->state->brushOrigin).toPoint();
}
 
void QPainter::setBrushOrigin(const QPointF &p)
{
    Q_D(QPainter);
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setBrushOrigin(), (%.2f,%.2f)\n", p.x(), p.y());
#endif
 
    if (!d->engine) {
        qWarning("QPainter::setBrushOrigin: Painter not active");
        return;
    }
 
    d->state->brushOrigin = p;
 
    if (d->extended) {
        d->extended->brushOriginChanged();
        return;
    }
 
    d->state->dirtyFlags |= QPaintEngine::DirtyBrushOrigin;
}
 
void QPainter::setCompositionMode(CompositionMode mode)
{
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setCompositionMode: Painter not active");
        return;
    }
    if (d->state->composition_mode == mode)
        return;
    if (d->extended) {
        d->state->composition_mode = mode;
        d->extended->compositionModeChanged();
        return;
    }
 
    if (mode >= QPainter::RasterOp_SourceOrDestination) {
        if (!d->engine->hasFeature(QPaintEngine::RasterOpModes)) {
            qWarning("QPainter::setCompositionMode: "
                     "Raster operation modes not supported on device");
            return;
        }
    } else if (mode >= QPainter::CompositionMode_Plus) {
        if (!d->engine->hasFeature(QPaintEngine::BlendModes)) {
            qWarning("QPainter::setCompositionMode: "
                     "Blend modes not supported on device");
            return;
        }
    } else if (!d->engine->hasFeature(QPaintEngine::PorterDuff)) {
        if (mode != CompositionMode_Source && mode != CompositionMode_SourceOver) {
            qWarning("QPainter::setCompositionMode: "
                     "PorterDuff modes not supported on device");
            return;
        }
    }
 
    d->state->composition_mode = mode;
    d->state->dirtyFlags |= QPaintEngine::DirtyCompositionMode;
}
 
QPainter::CompositionMode QPainter::compositionMode() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::compositionMode: Painter not active");
        return QPainter::CompositionMode_SourceOver;
    }
    return d->state->composition_mode;
}
 
const QBrush &QPainter::background() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::background: Painter not active");
        return d->fakeState()->brush;
    }
    return d->state->bgBrush;
}
 
 
bool QPainter::hasClipping() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::hasClipping: Painter not active");
        return false;
    }
    return d->state->clipEnabled && d->state->clipOperation != Qt::NoClip;
}
 
 
void QPainter::setClipping(bool enable)
{
    Q_D(QPainter);
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setClipping(), enable=%s, was=%s\n",
               enable ? "on" : "off",
               hasClipping() ? "on" : "off");
#endif
    if (!d->engine) {
        qWarning("QPainter::setClipping: Painter not active, state will be reset by begin");
        return;
    }
 
    if (hasClipping() == enable)
        return;
 
    // we can't enable clipping if we don't have a clip
    if (enable
        && (d->state->clipInfo.isEmpty() || d->state->clipInfo.constLast().operation == Qt::NoClip))
        return;
    d->state->clipEnabled = enable;
 
    if (d->extended) {
        d->extended->clipEnabledChanged();
        return;
    }
 
    d->state->dirtyFlags |= QPaintEngine::DirtyClipEnabled;
    d->updateState(d->state);
}
 
 
QRegion QPainter::clipRegion() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::clipRegion: Painter not active");
        return QRegion();
    }
 
    QRegion region;
    bool lastWasNothing = true;
 
    if (!d->txinv)
        const_cast<QPainter *>(this)->d_ptr->updateInvMatrix();
 
    // ### Falcon: Use QPainterPath
    for (const QPainterClipInfo &info : std::as_const(d->state->clipInfo)) {
        switch (info.clipType) {
 
        case QPainterClipInfo::RegionClip: {
            QTransform matrix = (info.matrix * d->invMatrix);
            if (lastWasNothing) {
                region = info.region * matrix;
                lastWasNothing = false;
                continue;
            }
            if (info.operation == Qt::IntersectClip)
                region &= info.region * matrix;
            else if (info.operation == Qt::NoClip) {
                lastWasNothing = true;
                region = QRegion();
            } else
                region = info.region * matrix;
            break;
        }
 
        case QPainterClipInfo::PathClip: {
            QTransform matrix = (info.matrix * d->invMatrix);
            if (lastWasNothing) {
                region = QRegion((info.path * matrix).toFillPolygon().toPolygon(),
                                 info.path.fillRule());
                lastWasNothing = false;
                continue;
            }
            if (info.operation == Qt::IntersectClip) {
                region &= QRegion((info.path * matrix).toFillPolygon().toPolygon(),
                                  info.path.fillRule());
            } else if (info.operation == Qt::NoClip) {
                lastWasNothing = true;
                region = QRegion();
            } else {
                region = QRegion((info.path * matrix).toFillPolygon().toPolygon(),
                                 info.path.fillRule());
            }
            break;
        }
 
        case QPainterClipInfo::RectClip: {
            QTransform matrix = (info.matrix * d->invMatrix);
            if (lastWasNothing) {
                region = QRegion(info.rect) * matrix;
                lastWasNothing = false;
                continue;
            }
            if (info.operation == Qt::IntersectClip) {
                // Use rect intersection if possible.
                if (matrix.type() <= QTransform::TxScale)
                    region &= matrix.mapRect(info.rect);
                else
                    region &= matrix.map(QRegion(info.rect));
            } else if (info.operation == Qt::NoClip) {
                lastWasNothing = true;
                region = QRegion();
            } else {
                region = QRegion(info.rect) * matrix;
            }
            break;
        }
 
        case QPainterClipInfo::RectFClip: {
            QTransform matrix = (info.matrix * d->invMatrix);
            if (lastWasNothing) {
                region = QRegion(info.rectf.toRect()) * matrix;
                lastWasNothing = false;
                continue;
            }
            if (info.operation == Qt::IntersectClip) {
                // Use rect intersection if possible.
                if (matrix.type() <= QTransform::TxScale)
                    region &= matrix.mapRect(info.rectf.toRect());
                else
                    region &= matrix.map(QRegion(info.rectf.toRect()));
            } else if (info.operation == Qt::NoClip) {
                lastWasNothing = true;
                region = QRegion();
            } else {
                region = QRegion(info.rectf.toRect()) * matrix;
            }
            break;
        }
        }
    }
 
    return region;
}
 
extern QPainterPath qt_regionToPath(const QRegion &region);
 
QPainterPath QPainter::clipPath() const
{
    Q_D(const QPainter);
 
    // ### Since we do not support path intersections and path unions yet,
    // we just use clipRegion() here...
    if (!d->engine) {
        qWarning("QPainter::clipPath: Painter not active");
        return QPainterPath();
    }
 
    // No clip, return empty
    if (d->state->clipInfo.isEmpty()) {
        return QPainterPath();
    } else {
 
        // Update inverse matrix, used below.
        if (!d->txinv)
            const_cast<QPainter *>(this)->d_ptr->updateInvMatrix();
 
        // For the simple case avoid conversion.
        if (d->state->clipInfo.size() == 1
            && d->state->clipInfo.at(0).clipType == QPainterClipInfo::PathClip) {
            QTransform matrix = (d->state->clipInfo.at(0).matrix * d->invMatrix);
            return d->state->clipInfo.at(0).path * matrix;
 
        } else if (d->state->clipInfo.size() == 1
                   && d->state->clipInfo.at(0).clipType == QPainterClipInfo::RectClip) {
            QTransform matrix = (d->state->clipInfo.at(0).matrix * d->invMatrix);
            QPainterPath path;
            path.addRect(d->state->clipInfo.at(0).rect);
            return path * matrix;
        } else {
            // Fallback to clipRegion() for now, since we don't have isect/unite for paths
            return qt_regionToPath(clipRegion());
        }
    }
}
 
QRectF QPainter::clipBoundingRect() const
{
    Q_D(const QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::clipBoundingRect: Painter not active");
        return QRectF();
    }
 
    // Accumulate the bounding box in device space. This is not 100%
    // precise, but it fits within the guarantee and it is reasonably
    // fast.
    QRectF bounds;
    bool first = true;
    for (const QPainterClipInfo &info : std::as_const(d->state->clipInfo)) {
         QRectF r;
 
         if (info.clipType == QPainterClipInfo::RectClip)
             r = info.rect;
         else if (info.clipType == QPainterClipInfo::RectFClip)
             r = info.rectf;
         else if (info.clipType == QPainterClipInfo::RegionClip)
             r = info.region.boundingRect();
         else
             r = info.path.boundingRect();
 
         r = info.matrix.mapRect(r);
 
         if (first)
             bounds = r;
         else if (info.operation == Qt::IntersectClip)
             bounds &= r;
         first = false;
    }
 
 
    // Map the rectangle back into logical space using the inverse
    // matrix.
    if (!d->txinv)
        const_cast<QPainter *>(this)->d_ptr->updateInvMatrix();
 
    return d->invMatrix.mapRect(bounds);
}
 
void QPainter::setClipRect(const QRectF &rect, Qt::ClipOperation op)
{
    Q_D(QPainter);
 
    if (d->extended) {
        if (!d->engine) {
            qWarning("QPainter::setClipRect: Painter not active");
            return;
        }
        bool simplifyClipOp = (paintEngine()->type() != QPaintEngine::Picture);
        if (simplifyClipOp && (!d->state->clipEnabled && op != Qt::NoClip))
            op = Qt::ReplaceClip;
 
        qreal right = rect.x() + rect.width();
        qreal bottom = rect.y() + rect.height();
        qreal pts[] = { rect.x(), rect.y(),
                        right, rect.y(),
                        right, bottom,
                        rect.x(), bottom };
        QVectorPath vp(pts, 4, nullptr, QVectorPath::RectangleHint);
        d->state->clipEnabled = true;
        d->extended->clip(vp, op);
        if (op == Qt::ReplaceClip || op == Qt::NoClip)
            d->state->clipInfo.clear();
        d->state->clipInfo.append(QPainterClipInfo(rect, op, d->state->matrix));
        d->state->clipOperation = op;
        return;
    }
 
    if (qreal(int(rect.top())) == rect.top()
        && qreal(int(rect.bottom())) == rect.bottom()
        && qreal(int(rect.left())) == rect.left()
        && qreal(int(rect.right())) == rect.right())
    {
        setClipRect(rect.toRect(), op);
        return;
    }
 
    if (rect.isEmpty()) {
        setClipRegion(QRegion(), op);
        return;
    }
 
    QPainterPath path;
    path.addRect(rect);
    setClipPath(path, op);
}
 
void QPainter::setClipRect(const QRect &rect, Qt::ClipOperation op)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setClipRect: Painter not active");
        return;
    }
    bool simplifyClipOp = (paintEngine()->type() != QPaintEngine::Picture);
 
    if (simplifyClipOp && (!d->state->clipEnabled && op != Qt::NoClip))
        op = Qt::ReplaceClip;
 
    if (d->extended) {
        d->state->clipEnabled = true;
        d->extended->clip(rect, op);
        if (op == Qt::ReplaceClip || op == Qt::NoClip)
            d->state->clipInfo.clear();
        d->state->clipInfo.append(QPainterClipInfo(rect, op, d->state->matrix));
        d->state->clipOperation = op;
        return;
    }
 
    if (simplifyClipOp && d->state->clipOperation == Qt::NoClip && op == Qt::IntersectClip)
        op = Qt::ReplaceClip;
 
    d->state->clipRegion = rect;
    d->state->clipOperation = op;
    if (op == Qt::NoClip || op == Qt::ReplaceClip)
        d->state->clipInfo.clear();
    d->state->clipInfo.append(QPainterClipInfo(rect, op, d->state->matrix));
    d->state->clipEnabled = true;
    d->state->dirtyFlags |= QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipEnabled;
    d->updateState(d->state);
}
 
void QPainter::setClipRegion(const QRegion &r, Qt::ClipOperation op)
{
    Q_D(QPainter);
#ifdef QT_DEBUG_DRAW
    QRect rect = r.boundingRect();
    if (qt_show_painter_debug_output)
        printf("QPainter::setClipRegion(), size=%d, [%d,%d,%d,%d]\n",
           r.rectCount(), rect.x(), rect.y(), rect.width(), rect.height());
#endif
    if (!d->engine) {
        qWarning("QPainter::setClipRegion: Painter not active");
        return;
    }
    bool simplifyClipOp = (paintEngine()->type() != QPaintEngine::Picture);
 
    if (simplifyClipOp && (!d->state->clipEnabled && op != Qt::NoClip))
        op = Qt::ReplaceClip;
 
    if (d->extended) {
        d->state->clipEnabled = true;
        d->extended->clip(r, op);
        if (op == Qt::NoClip || op == Qt::ReplaceClip)
            d->state->clipInfo.clear();
        d->state->clipInfo.append(QPainterClipInfo(r, op, d->state->matrix));
        d->state->clipOperation = op;
        return;
    }
 
    if (simplifyClipOp && d->state->clipOperation == Qt::NoClip && op == Qt::IntersectClip)
        op = Qt::ReplaceClip;
 
    d->state->clipRegion = r;
    d->state->clipOperation = op;
    if (op == Qt::NoClip || op == Qt::ReplaceClip)
        d->state->clipInfo.clear();
    d->state->clipInfo.append(QPainterClipInfo(r, op, d->state->matrix));
    d->state->clipEnabled = true;
    d->state->dirtyFlags |= QPaintEngine::DirtyClipRegion | QPaintEngine::DirtyClipEnabled;
    d->updateState(d->state);
}
 
void QPainter::setWorldMatrixEnabled(bool enable)
{
    Q_D(QPainter);
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setMatrixEnabled(), enable=%d\n", enable);
#endif
 
    if (!d->engine) {
        qWarning("QPainter::setMatrixEnabled: Painter not active");
        return;
    }
    if (enable == d->state->WxF)
        return;
 
    d->state->WxF = enable;
    d->updateMatrix();
}
 
bool QPainter::worldMatrixEnabled() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::worldMatrixEnabled: Painter not active");
        return false;
    }
    return d->state->WxF;
}
 
void QPainter::scale(qreal sx, qreal sy)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::scale(), sx=%f, sy=%f\n", sx, sy);
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::scale: Painter not active");
        return;
    }
 
    d->state->worldMatrix.scale(sx,sy);
    d->state->WxF = true;
    d->updateMatrix();
}
 
void QPainter::shear(qreal sh, qreal sv)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::shear(), sh=%f, sv=%f\n", sh, sv);
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::shear: Painter not active");
        return;
    }
 
    d->state->worldMatrix.shear(sh, sv);
    d->state->WxF = true;
    d->updateMatrix();
}
 
void QPainter::rotate(qreal a)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::rotate(), angle=%f\n", a);
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::rotate: Painter not active");
        return;
    }
 
    d->state->worldMatrix.rotate(a);
    d->state->WxF = true;
    d->updateMatrix();
}
 
void QPainter::translate(const QPointF &offset)
{
    qreal dx = offset.x();
    qreal dy = offset.y();
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::translate(), dx=%f, dy=%f\n", dx, dy);
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::translate: Painter not active");
        return;
    }
 
    d->state->worldMatrix.translate(dx, dy);
    d->state->WxF = true;
    d->updateMatrix();
}
 
void QPainter::setClipPath(const QPainterPath &path, Qt::ClipOperation op)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output) {
        QRectF b = path.boundingRect();
        printf("QPainter::setClipPath(), size=%d, op=%d, bounds=[%.2f,%.2f,%.2f,%.2f]\n",
               path.elementCount(), op, b.x(), b.y(), b.width(), b.height());
    }
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setClipPath: Painter not active");
        return;
    }
 
    bool simplifyClipOp = (paintEngine()->type() != QPaintEngine::Picture);
    if (simplifyClipOp && (!d->state->clipEnabled && op != Qt::NoClip))
        op = Qt::ReplaceClip;
 
    if (d->extended) {
        d->state->clipEnabled = true;
        d->extended->clip(path, op);
        if (op == Qt::NoClip || op == Qt::ReplaceClip)
            d->state->clipInfo.clear();
        d->state->clipInfo.append(QPainterClipInfo(path, op, d->state->matrix));
        d->state->clipOperation = op;
        return;
    }
 
    if (simplifyClipOp && d->state->clipOperation == Qt::NoClip && op == Qt::IntersectClip)
        op = Qt::ReplaceClip;
 
    d->state->clipPath = path;
    d->state->clipOperation = op;
    if (op == Qt::NoClip || op == Qt::ReplaceClip)
        d->state->clipInfo.clear();
    d->state->clipInfo.append(QPainterClipInfo(path, op, d->state->matrix));
    d->state->clipEnabled = true;
    d->state->dirtyFlags |= QPaintEngine::DirtyClipPath | QPaintEngine::DirtyClipEnabled;
    d->updateState(d->state);
}
 
void QPainter::strokePath(const QPainterPath &path, const QPen &pen)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::strokePath: Painter not active");
        return;
    }
 
    if (path.isEmpty())
        return;
 
    if (d->extended && !needsEmulation(pen.brush())) {
        d->extended->stroke(qtVectorPathForPath(path), pen);
        return;
    }
 
    QBrush oldBrush = d->state->brush;
    QPen oldPen = d->state->pen;
 
    setPen(pen);
    setBrush(Qt::NoBrush);
 
    drawPath(path);
 
    // Reset old state
    setPen(oldPen);
    setBrush(oldBrush);
}
 
void QPainter::fillPath(const QPainterPath &path, const QBrush &brush)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::fillPath: Painter not active");
        return;
    }
 
    if (path.isEmpty())
        return;
 
    if (d->extended && !needsEmulation(brush)) {
        d->extended->fill(qtVectorPathForPath(path), brush);
        return;
    }
 
    QBrush oldBrush = d->state->brush;
    QPen oldPen = d->state->pen;
 
    setPen(Qt::NoPen);
    setBrush(brush);
 
    drawPath(path);
 
    // Reset old state
    setPen(oldPen);
    setBrush(oldBrush);
}
 
void QPainter::drawPath(const QPainterPath &path)
{
#ifdef QT_DEBUG_DRAW
    QRectF pathBounds = path.boundingRect();
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPath(), size=%d, [%.2f,%.2f,%.2f,%.2f]\n",
               path.elementCount(),
               pathBounds.x(), pathBounds.y(), pathBounds.width(), pathBounds.height());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawPath: Painter not active");
        return;
    }
 
    if (d->extended) {
        d->extended->drawPath(path);
        return;
    }
    d->updateState(d->state);
 
    if (d->engine->hasFeature(QPaintEngine::PainterPaths) && d->state->emulationSpecifier == 0) {
        d->engine->drawPath(path);
    } else {
        d->draw_helper(path);
    }
}
 
void QPainter::drawRects(const QRectF *rects, int rectCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawRects(), count=%d\n", rectCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawRects: Painter not active");
        return;
    }
 
    if (rectCount <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawRects(rects, rectCount);
        return;
    }
 
    d->updateState(d->state);
 
    if (!d->state->emulationSpecifier) {
        d->engine->drawRects(rects, rectCount);
        return;
    }
 
    if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
        && d->state->matrix.type() == QTransform::TxTranslate) {
        for (int i=0; i<rectCount; ++i) {
            QRectF r(rects[i].x() + d->state->matrix.dx(),
                     rects[i].y() + d->state->matrix.dy(),
                     rects[i].width(),
                     rects[i].height());
            d->engine->drawRects(&r, 1);
        }
    } else {
        if (d->state->brushNeedsResolving() || d->state->penNeedsResolving()) {
            for (int i=0; i<rectCount; ++i) {
                QPainterPath rectPath;
                rectPath.addRect(rects[i]);
                d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw);
            }
        } else {
            QPainterPath rectPath;
            for (int i=0; i<rectCount; ++i)
                rectPath.addRect(rects[i]);
            d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw);
        }
    }
}
 
void QPainter::drawRects(const QRect *rects, int rectCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawRects(), count=%d\n", rectCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawRects: Painter not active");
        return;
    }
 
    if (rectCount <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawRects(rects, rectCount);
        return;
    }
 
    d->updateState(d->state);
 
    if (!d->state->emulationSpecifier) {
        d->engine->drawRects(rects, rectCount);
        return;
    }
 
    if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
        && d->state->matrix.type() == QTransform::TxTranslate) {
        for (int i=0; i<rectCount; ++i) {
            QRectF r(rects[i].x() + d->state->matrix.dx(),
                     rects[i].y() + d->state->matrix.dy(),
                     rects[i].width(),
                     rects[i].height());
 
            d->engine->drawRects(&r, 1);
        }
    } else {
        if (d->state->brushNeedsResolving() || d->state->penNeedsResolving()) {
            for (int i=0; i<rectCount; ++i) {
                QPainterPath rectPath;
                rectPath.addRect(rects[i]);
                d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw);
            }
        } else {
            QPainterPath rectPath;
            for (int i=0; i<rectCount; ++i)
                rectPath.addRect(rects[i]);
 
            d->draw_helper(rectPath, QPainterPrivate::StrokeAndFillDraw);
        }
    }
}
 
void QPainter::drawPoints(const QPointF *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPoints(), count=%d\n", pointCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawPoints: Painter not active");
        return;
    }
 
    if (pointCount <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawPoints(points, pointCount);
        return;
    }
 
    d->updateState(d->state);
 
    if (!d->state->emulationSpecifier) {
        d->engine->drawPoints(points, pointCount);
        return;
    }
 
    if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
        && d->state->matrix.type() == QTransform::TxTranslate) {
        // ### use drawPoints function
        for (int i=0; i<pointCount; ++i) {
            QPointF pt(points[i].x() + d->state->matrix.dx(),
                       points[i].y() + d->state->matrix.dy());
            d->engine->drawPoints(&pt, 1);
        }
    } else {
        QPen pen = d->state->pen;
        bool flat_pen = pen.capStyle() == Qt::FlatCap;
        if (flat_pen) {
            save();
            pen.setCapStyle(Qt::SquareCap);
            setPen(pen);
        }
        QPainterPath path;
        for (int i=0; i<pointCount; ++i) {
            path.moveTo(points[i].x(), points[i].y());
            path.lineTo(points[i].x() + 0.0001, points[i].y());
        }
        d->draw_helper(path, QPainterPrivate::StrokeDraw);
        if (flat_pen)
            restore();
    }
}
 
void QPainter::drawPoints(const QPoint *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPoints(), count=%d\n", pointCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawPoints: Painter not active");
        return;
    }
 
    if (pointCount <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawPoints(points, pointCount);
        return;
    }
 
    d->updateState(d->state);
 
    if (!d->state->emulationSpecifier) {
        d->engine->drawPoints(points, pointCount);
        return;
    }
 
    if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
        && d->state->matrix.type() == QTransform::TxTranslate) {
        // ### use drawPoints function
        for (int i=0; i<pointCount; ++i) {
            QPointF pt(points[i].x() + d->state->matrix.dx(),
                       points[i].y() + d->state->matrix.dy());
            d->engine->drawPoints(&pt, 1);
        }
    } else {
        QPen pen = d->state->pen;
        bool flat_pen = (pen.capStyle() == Qt::FlatCap);
        if (flat_pen) {
            save();
            pen.setCapStyle(Qt::SquareCap);
            setPen(pen);
        }
        QPainterPath path;
        for (int i=0; i<pointCount; ++i) {
            path.moveTo(points[i].x(), points[i].y());
            path.lineTo(points[i].x() + 0.0001, points[i].y());
        }
        d->draw_helper(path, QPainterPrivate::StrokeDraw);
        if (flat_pen)
            restore();
    }
}
 
void QPainter::setBackgroundMode(Qt::BGMode mode)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setBackgroundMode(), mode=%d\n", mode);
#endif
 
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setBackgroundMode: Painter not active");
        return;
    }
    if (d->state->bgMode == mode)
        return;
 
    d->state->bgMode = mode;
    if (d->extended) {
        d->checkEmulation();
    } else {
        d->state->dirtyFlags |= QPaintEngine::DirtyBackgroundMode;
    }
}
 
Qt::BGMode QPainter::backgroundMode() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::backgroundMode: Painter not active");
        return Qt::TransparentMode;
    }
    return d->state->bgMode;
}
 
 
void QPainter::setPen(const QColor &color)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setPen(), color=%04x\n", color.rgb());
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setPen: Painter not active");
        return;
    }
 
    QPen pen(color.isValid() ? color : QColor(Qt::black));
 
    if (d->state->pen == pen)
        return;
 
    d->state->pen = pen;
    if (d->extended)
        d->extended->penChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyPen;
}
 
void QPainter::setPen(const QPen &pen)
{
 
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setPen(), color=%04x, (brushStyle=%d) style=%d, cap=%d, join=%d\n",
           pen.color().rgb(), pen.brush().style(), pen.style(), pen.capStyle(), pen.joinStyle());
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setPen: Painter not active");
        return;
    }
 
    if (d->state->pen == pen)
        return;
 
    d->state->pen = pen;
 
    if (d->extended) {
        d->checkEmulation();
        d->extended->penChanged();
        return;
    }
 
    d->state->dirtyFlags |= QPaintEngine::DirtyPen;
}
 
void QPainter::setPen(Qt::PenStyle style)
{
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setPen: Painter not active");
        return;
    }
 
    QPen pen = QPen(style);
 
    if (d->state->pen == pen)
        return;
 
    d->state->pen = pen;
 
    if (d->extended)
        d->extended->penChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyPen;
 
}
 
const QPen &QPainter::pen() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::pen: Painter not active");
        return d->fakeState()->pen;
    }
    return d->state->pen;
}
 
 
void QPainter::setBrush(const QBrush &brush)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setBrush(), color=%04x, style=%d\n", brush.color().rgb(), brush.style());
#endif
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setBrush: Painter not active");
        return;
    }
 
    if (d->state->brush.d == brush.d)
        return;
 
    if (d->extended) {
        d->state->brush = brush;
        d->checkEmulation();
        d->extended->brushChanged();
        return;
    }
 
    d->state->brush = brush;
    d->state->dirtyFlags |= QPaintEngine::DirtyBrush;
}
 
 
void QPainter::setBrush(Qt::BrushStyle style)
{
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setBrush: Painter not active");
        return;
    }
    if (d->state->brush.style() == style &&
        (style == Qt::NoBrush
         || (style == Qt::SolidPattern && d->state->brush.color() == QColor(0, 0, 0))))
        return;
    d->state->brush = QBrush(Qt::black, style);
    if (d->extended)
        d->extended->brushChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyBrush;
}
 
const QBrush &QPainter::brush() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::brush: Painter not active");
        return d->fakeState()->brush;
    }
    return d->state->brush;
}
 
void QPainter::setBackground(const QBrush &bg)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setBackground(), color=%04x, style=%d\n", bg.color().rgb(), bg.style());
#endif
 
    Q_D(QPainter);
    if (!d->engine) {
        qWarning("QPainter::setBackground: Painter not active");
        return;
    }
    d->state->bgBrush = bg;
    if (!d->extended)
        d->state->dirtyFlags |= QPaintEngine::DirtyBackground;
}
 
void QPainter::setFont(const QFont &font)
{
    Q_D(QPainter);
 
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setFont(), family=%s, pointSize=%d\n", font.families().first().toLatin1().constData(), font.pointSize());
#endif
 
    if (!d->engine) {
        qWarning("QPainter::setFont: Painter not active");
        return;
    }
 
    d->state->font = QFont(font.resolve(d->state->deviceFont), device());
    if (!d->extended)
        d->state->dirtyFlags |= QPaintEngine::DirtyFont;
}
 
const QFont &QPainter::font() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::font: Painter not active");
        return d->fakeState()->font;
    }
    return d->state->font;
}
 
void QPainter::drawRoundedRect(const QRectF &rect, qreal xRadius, qreal yRadius, Qt::SizeMode mode)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawRoundedRect(), [%.2f,%.2f,%.2f,%.2f]\n", rect.x(), rect.y(), rect.width(), rect.height());
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (xRadius <= 0 || yRadius <= 0) {             // draw normal rectangle
        drawRect(rect);
        return;
    }
 
    if (d->extended) {
        d->extended->drawRoundedRect(rect, xRadius, yRadius, mode);
        return;
    }
 
    QPainterPath path;
    path.addRoundedRect(rect, xRadius, yRadius, mode);
    drawPath(path);
}
 
void QPainter::drawEllipse(const QRectF &r)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawEllipse(), [%.2f,%.2f,%.2f,%.2f]\n", r.x(), r.y(), r.width(), r.height());
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    QRectF rect(r.normalized());
 
    if (d->extended) {
        d->extended->drawEllipse(rect);
        return;
    }
 
    d->updateState(d->state);
    if (d->state->emulationSpecifier) {
        if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
            && d->state->matrix.type() == QTransform::TxTranslate) {
            rect.translate(QPointF(d->state->matrix.dx(), d->state->matrix.dy()));
        } else {
            QPainterPath path;
            path.addEllipse(rect);
            d->draw_helper(path, QPainterPrivate::StrokeAndFillDraw);
            return;
        }
    }
 
    d->engine->drawEllipse(rect);
}
 
void QPainter::drawEllipse(const QRect &r)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawEllipse(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height());
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    QRect rect(r.normalized());
 
    if (d->extended) {
        d->extended->drawEllipse(rect);
        return;
    }
 
    d->updateState(d->state);
 
    if (d->state->emulationSpecifier) {
        if (d->state->emulationSpecifier == QPaintEngine::PrimitiveTransform
            && d->state->matrix.type() == QTransform::TxTranslate) {
            rect.translate(QPoint(qRound(d->state->matrix.dx()), qRound(d->state->matrix.dy())));
        } else {
            QPainterPath path;
            path.addEllipse(rect);
            d->draw_helper(path, QPainterPrivate::StrokeAndFillDraw);
            return;
        }
    }
 
    d->engine->drawEllipse(rect);
}
 
void QPainter::drawArc(const QRectF &r, int a, int alen)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawArc(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n",
           r.x(), r.y(), r.width(), r.height(), a/16, alen/16);
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    QRectF rect = r.normalized();
 
    QPainterPath path;
    path.arcMoveTo(rect, a/16.0);
    path.arcTo(rect, a/16.0, alen/16.0);
    strokePath(path, d->state->pen);
}
 
void QPainter::drawPie(const QRectF &r, int a, int alen)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPie(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n",
           r.x(), r.y(), r.width(), r.height(), a/16, alen/16);
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (a > (360*16)) {
        a = a % (360*16);
    } else if (a < 0) {
        a = a % (360*16);
        if (a < 0) a += (360*16);
    }
 
    QRectF rect = r.normalized();
 
    QPainterPath path;
    path.moveTo(rect.center());
    path.arcTo(rect.x(), rect.y(), rect.width(), rect.height(), a/16.0, alen/16.0);
    path.closeSubpath();
    drawPath(path);
 
}
 
void QPainter::drawChord(const QRectF &r, int a, int alen)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawChord(), [%.2f,%.2f,%.2f,%.2f], angle=%d, sweep=%d\n",
           r.x(), r.y(), r.width(), r.height(), a/16, alen/16);
#endif
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    QRectF rect = r.normalized();
 
    QPainterPath path;
    path.arcMoveTo(rect, a/16.0);
    path.arcTo(rect, a/16.0, alen/16.0);
    path.closeSubpath();
    drawPath(path);
}
void QPainter::drawLines(const QLineF *lines, int lineCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawLines(), line count=%d\n", lineCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || lineCount < 1)
        return;
 
    if (d->extended) {
        d->extended->drawLines(lines, lineCount);
        return;
    }
 
    d->updateState(d->state);
 
    uint lineEmulation = line_emulation(d->state->emulationSpecifier);
 
    if (lineEmulation) {
        if (lineEmulation == QPaintEngine::PrimitiveTransform
            && d->state->matrix.type() == QTransform::TxTranslate) {
            for (int i = 0; i < lineCount; ++i) {
                QLineF line = lines[i];
                line.translate(d->state->matrix.dx(), d->state->matrix.dy());
                d->engine->drawLines(&line, 1);
            }
        } else {
            QPainterPath linePath;
            for (int i = 0; i < lineCount; ++i) {
                linePath.moveTo(lines[i].p1());
                linePath.lineTo(lines[i].p2());
            }
            d->draw_helper(linePath, QPainterPrivate::StrokeDraw);
        }
        return;
    }
    d->engine->drawLines(lines, lineCount);
}
 
void QPainter::drawLines(const QLine *lines, int lineCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawLine(), line count=%d\n", lineCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || lineCount < 1)
        return;
 
    if (d->extended) {
        d->extended->drawLines(lines, lineCount);
        return;
    }
 
    d->updateState(d->state);
 
    uint lineEmulation = line_emulation(d->state->emulationSpecifier);
 
    if (lineEmulation) {
        if (lineEmulation == QPaintEngine::PrimitiveTransform
            && d->state->matrix.type() == QTransform::TxTranslate) {
            for (int i = 0; i < lineCount; ++i) {
                QLineF line = lines[i];
                line.translate(d->state->matrix.dx(), d->state->matrix.dy());
                d->engine->drawLines(&line, 1);
            }
        } else {
            QPainterPath linePath;
            for (int i = 0; i < lineCount; ++i) {
                linePath.moveTo(lines[i].p1());
                linePath.lineTo(lines[i].p2());
            }
            d->draw_helper(linePath, QPainterPrivate::StrokeDraw);
        }
        return;
    }
    d->engine->drawLines(lines, lineCount);
}
 
void QPainter::drawLines(const QPointF *pointPairs, int lineCount)
{
    Q_ASSERT(sizeof(QLineF) == 2*sizeof(QPointF));
 
    drawLines((const QLineF*)pointPairs, lineCount);
}
 
void QPainter::drawLines(const QPoint *pointPairs, int lineCount)
{
    Q_ASSERT(sizeof(QLine) == 2*sizeof(QPoint));
 
    drawLines((const QLine*)pointPairs, lineCount);
}
 
 
void QPainter::drawPolyline(const QPointF *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPolyline(), count=%d\n", pointCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::PolylineMode);
        return;
    }
 
    d->updateState(d->state);
 
    uint lineEmulation = line_emulation(d->state->emulationSpecifier);
 
    if (lineEmulation) {
        // ###
//         if (lineEmulation == QPaintEngine::PrimitiveTransform
//             && d->state->matrix.type() == QTransform::TxTranslate) {
//         } else {
        QPainterPath polylinePath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polylinePath.lineTo(points[i]);
        d->draw_helper(polylinePath, QPainterPrivate::StrokeDraw);
//         }
    } else {
        d->engine->drawPolygon(points, pointCount, QPaintEngine::PolylineMode);
    }
}
 
void QPainter::drawPolyline(const QPoint *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPolyline(), count=%d\n", pointCount);
#endif
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::PolylineMode);
        return;
    }
 
    d->updateState(d->state);
 
    uint lineEmulation = line_emulation(d->state->emulationSpecifier);
 
    if (lineEmulation) {
        // ###
//         if (lineEmulation == QPaintEngine::PrimitiveTransform
//             && d->state->matrix.type() == QTransform::TxTranslate) {
//         } else {
        QPainterPath polylinePath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polylinePath.lineTo(points[i]);
        d->draw_helper(polylinePath, QPainterPrivate::StrokeDraw);
//         }
    } else {
        d->engine->drawPolygon(points, pointCount, QPaintEngine::PolylineMode);
    }
}
 
void QPainter::drawPolygon(const QPointF *points, int pointCount, Qt::FillRule fillRule)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPolygon(), count=%d\n", pointCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule));
        return;
    }
 
    d->updateState(d->state);
 
    uint emulationSpecifier = d->state->emulationSpecifier;
 
    if (emulationSpecifier) {
        QPainterPath polygonPath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polygonPath.lineTo(points[i]);
        polygonPath.closeSubpath();
        polygonPath.setFillRule(fillRule);
        d->draw_helper(polygonPath);
        return;
    }
 
    d->engine->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule));
}
 
void QPainter::drawPolygon(const QPoint *points, int pointCount, Qt::FillRule fillRule)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPolygon(), count=%d\n", pointCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule));
        return;
    }
 
    d->updateState(d->state);
 
    uint emulationSpecifier = d->state->emulationSpecifier;
 
    if (emulationSpecifier) {
        QPainterPath polygonPath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polygonPath.lineTo(points[i]);
        polygonPath.closeSubpath();
        polygonPath.setFillRule(fillRule);
        d->draw_helper(polygonPath);
        return;
    }
 
    d->engine->drawPolygon(points, pointCount, QPaintEngine::PolygonDrawMode(fillRule));
}
 
void QPainter::drawConvexPolygon(const QPoint *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawConvexPolygon(), count=%d\n", pointCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::ConvexMode);
        return;
    }
 
    d->updateState(d->state);
 
    uint emulationSpecifier = d->state->emulationSpecifier;
 
    if (emulationSpecifier) {
        QPainterPath polygonPath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polygonPath.lineTo(points[i]);
        polygonPath.closeSubpath();
        polygonPath.setFillRule(Qt::WindingFill);
        d->draw_helper(polygonPath);
        return;
    }
 
    d->engine->drawPolygon(points, pointCount, QPaintEngine::ConvexMode);
}
 
void QPainter::drawConvexPolygon(const QPointF *points, int pointCount)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawConvexPolygon(), count=%d\n", pointCount);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || pointCount < 2)
        return;
 
    if (d->extended) {
        d->extended->drawPolygon(points, pointCount, QPaintEngine::ConvexMode);
        return;
    }
 
    d->updateState(d->state);
 
    uint emulationSpecifier = d->state->emulationSpecifier;
 
    if (emulationSpecifier) {
        QPainterPath polygonPath(points[0]);
        for (int i=1; i<pointCount; ++i)
            polygonPath.lineTo(points[i]);
        polygonPath.closeSubpath();
        polygonPath.setFillRule(Qt::WindingFill);
        d->draw_helper(polygonPath);
        return;
    }
 
    d->engine->drawPolygon(points, pointCount, QPaintEngine::ConvexMode);
}
 
static inline QPointF roundInDeviceCoordinates(const QPointF &p, const QTransform &m)
{
    return m.inverted().map(QPointF(m.map(p).toPoint()));
}
 
void QPainter::drawPixmap(const QPointF &p, const QPixmap &pm)
{
#if defined QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPixmap(), p=[%.2f,%.2f], pix=[%d,%d]\n",
               p.x(), p.y(),
               pm.width(), pm.height());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || pm.isNull())
        return;
 
#ifndef QT_NO_DEBUG
    qt_painter_thread_test(d->device->devType(), d->engine->type(), "drawPixmap()");
#endif
 
    if (d->extended) {
        d->extended->drawPixmap(p, pm);
        return;
    }
 
    qreal x = p.x();
    qreal y = p.y();
 
    int w = pm.width();
    int h = pm.height();
 
    if (w <= 0)
        return;
 
    // Emulate opaque background for bitmaps
    if (d->state->bgMode == Qt::OpaqueMode && pm.isQBitmap()) {
        fillRect(QRectF(x, y, w, h), d->state->bgBrush.color());
    }
 
    d->updateState(d->state);
 
    if ((d->state->matrix.type() > QTransform::TxTranslate
         && !d->engine->hasFeature(QPaintEngine::PixmapTransform))
        || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform))
        || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity)))
    {
        save();
        // If there is no rotation involved we have to make sure we use the
        // antialiased and not the aliased coordinate system by rounding the coordinates.
        if (d->state->matrix.type() <= QTransform::TxScale) {
            const QPointF p = roundInDeviceCoordinates(QPointF(x, y), d->state->matrix);
            x = p.x();
            y = p.y();
        }
        translate(x, y);
        setBackgroundMode(Qt::TransparentMode);
        setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform);
        QBrush brush(d->state->pen.color(), pm);
        setBrush(brush);
        setPen(Qt::NoPen);
        setBrushOrigin(QPointF(0, 0));
 
        drawRect(pm.rect());
        restore();
    } else {
        if (!d->engine->hasFeature(QPaintEngine::PixmapTransform)) {
            x += d->state->matrix.dx();
            y += d->state->matrix.dy();
        }
        qreal scale = pm.devicePixelRatio();
        d->engine->drawPixmap(QRectF(x, y, w / scale, h / scale), pm, QRectF(0, 0, w, h));
    }
}
 
void QPainter::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)
{
#if defined QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawPixmap(), target=[%.2f,%.2f,%.2f,%.2f], pix=[%d,%d], source=[%.2f,%.2f,%.2f,%.2f]\n",
               r.x(), r.y(), r.width(), r.height(),
               pm.width(), pm.height(),
               sr.x(), sr.y(), sr.width(), sr.height());
#endif
 
    Q_D(QPainter);
    if (!d->engine || pm.isNull())
        return;
#ifndef QT_NO_DEBUG
    qt_painter_thread_test(d->device->devType(), d->engine->type(), "drawPixmap()");
#endif
 
    qreal x = r.x();
    qreal y = r.y();
    qreal w = r.width();
    qreal h = r.height();
    qreal sx = sr.x();
    qreal sy = sr.y();
    qreal sw = sr.width();
    qreal sh = sr.height();
 
    // Get pixmap scale. Use it when calculating the target
    // rect size from pixmap size. For example, a 2X 64x64 pixel
    // pixmap should result in a 32x32 point target rect.
    const qreal pmscale = pm.devicePixelRatio();
 
    // Sanity-check clipping
    if (sw <= 0)
        sw = pm.width() - sx;
 
    if (sh <= 0)
        sh = pm.height() - sy;
 
    if (w < 0)
        w = sw / pmscale;
    if (h < 0)
        h = sh / pmscale;
 
    if (sx < 0) {
        qreal w_ratio = sx * w/sw;
        x -= w_ratio;
        w += w_ratio;
        sw += sx;
        sx = 0;
    }
 
    if (sy < 0) {
        qreal h_ratio = sy * h/sh;
        y -= h_ratio;
        h += h_ratio;
        sh += sy;
        sy = 0;
    }
 
    if (sw + sx > pm.width()) {
        qreal delta = sw - (pm.width() - sx);
        qreal w_ratio = delta * w/sw;
        sw -= delta;
        w -= w_ratio;
    }
 
    if (sh + sy > pm.height()) {
        qreal delta = sh - (pm.height() - sy);
        qreal h_ratio = delta * h/sh;
        sh -= delta;
        h -= h_ratio;
    }
 
    if (w == 0 || h == 0 || sw <= 0 || sh <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawPixmap(QRectF(x, y, w, h), pm, QRectF(sx, sy, sw, sh));
        return;
    }
 
    // Emulate opaque background for bitmaps
    if (d->state->bgMode == Qt::OpaqueMode && pm.isQBitmap())
        fillRect(QRectF(x, y, w, h), d->state->bgBrush.color());
 
    d->updateState(d->state);
 
    if ((d->state->matrix.type() > QTransform::TxTranslate
         && !d->engine->hasFeature(QPaintEngine::PixmapTransform))
        || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform))
        || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity))
        || ((sw != w || sh != h) && !d->engine->hasFeature(QPaintEngine::PixmapTransform)))
    {
        save();
        // If there is no rotation involved we have to make sure we use the
        // antialiased and not the aliased coordinate system by rounding the coordinates.
        if (d->state->matrix.type() <= QTransform::TxScale) {
            const QPointF p = roundInDeviceCoordinates(QPointF(x, y), d->state->matrix);
            x = p.x();
            y = p.y();
        }
 
        if (d->state->matrix.type() <= QTransform::TxTranslate && sw == w && sh == h) {
            sx = qRound(sx);
            sy = qRound(sy);
            sw = qRound(sw);
            sh = qRound(sh);
        }
 
        translate(x, y);
        scale(w / sw, h / sh);
        setBackgroundMode(Qt::TransparentMode);
        setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform);
        QBrush brush;
 
        if (sw == pm.width() && sh == pm.height())
            brush = QBrush(d->state->pen.color(), pm);
        else
            brush = QBrush(d->state->pen.color(), pm.copy(sx, sy, sw, sh));
 
        setBrush(brush);
        setPen(Qt::NoPen);
 
        drawRect(QRectF(0, 0, sw, sh));
        restore();
    } else {
        if (!d->engine->hasFeature(QPaintEngine::PixmapTransform)) {
            x += d->state->matrix.dx();
            y += d->state->matrix.dy();
        }
        d->engine->drawPixmap(QRectF(x, y, w, h), pm, QRectF(sx, sy, sw, sh));
    }
}
 
 
void QPainter::drawImage(const QPointF &p, const QImage &image)
{
    Q_D(QPainter);
 
    if (!d->engine || image.isNull())
        return;
 
    if (d->extended) {
        d->extended->drawImage(p, image);
        return;
    }
 
    qreal x = p.x();
    qreal y = p.y();
 
    int w = image.width();
    int h = image.height();
    qreal scale = image.devicePixelRatio();
 
    d->updateState(d->state);
 
    if (((d->state->matrix.type() > QTransform::TxTranslate)
         && !d->engine->hasFeature(QPaintEngine::PixmapTransform))
        || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform))
        || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity)))
    {
        save();
        // If there is no rotation involved we have to make sure we use the
        // antialiased and not the aliased coordinate system by rounding the coordinates.
        if (d->state->matrix.type() <= QTransform::TxScale) {
            const QPointF p = roundInDeviceCoordinates(QPointF(x, y), d->state->matrix);
            x = p.x();
            y = p.y();
        }
        translate(x, y);
        setBackgroundMode(Qt::TransparentMode);
        setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform);
        QBrush brush(image);
        setBrush(brush);
        setPen(Qt::NoPen);
        setBrushOrigin(QPointF(0, 0));
        drawRect(QRect(QPoint(0, 0), image.size() / scale));
        restore();
        return;
    }
 
    if (d->state->matrix.type() == QTransform::TxTranslate
        && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) {
        x += d->state->matrix.dx();
        y += d->state->matrix.dy();
    }
 
    d->engine->drawImage(QRectF(x, y, w / scale, h / scale), image, QRectF(0, 0, w, h), Qt::AutoColor);
}
 
void QPainter::drawImage(const QRectF &targetRect, const QImage &image, const QRectF &sourceRect,
                         Qt::ImageConversionFlags flags)
{
    Q_D(QPainter);
 
    if (!d->engine || image.isNull())
        return;
 
    qreal x = targetRect.x();
    qreal y = targetRect.y();
    qreal w = targetRect.width();
    qreal h = targetRect.height();
    qreal sx = sourceRect.x();
    qreal sy = sourceRect.y();
    qreal sw = sourceRect.width();
    qreal sh = sourceRect.height();
    qreal imageScale = image.devicePixelRatio();
 
    // Sanity-check clipping
    if (sw <= 0)
        sw = image.width() - sx;
 
    if (sh <= 0)
        sh = image.height() - sy;
 
    if (w < 0)
        w = sw / imageScale;
    if (h < 0)
        h = sh / imageScale;
 
    if (sx < 0) {
        qreal w_ratio = sx * w/sw;
        x -= w_ratio;
        w += w_ratio;
        sw += sx;
        sx = 0;
    }
 
    if (sy < 0) {
        qreal h_ratio = sy * h/sh;
        y -= h_ratio;
        h += h_ratio;
        sh += sy;
        sy = 0;
    }
 
    if (sw + sx > image.width()) {
        qreal delta = sw - (image.width() - sx);
        qreal w_ratio = delta * w/sw;
        sw -= delta;
        w -= w_ratio;
    }
 
    if (sh + sy > image.height()) {
        qreal delta = sh - (image.height() - sy);
        qreal h_ratio = delta * h/sh;
        sh -= delta;
        h -= h_ratio;
    }
 
    if (w == 0 || h == 0 || sw <= 0 || sh <= 0)
        return;
 
    if (d->extended) {
        d->extended->drawImage(QRectF(x, y, w, h), image, QRectF(sx, sy, sw, sh), flags);
        return;
    }
 
    d->updateState(d->state);
 
    if (((d->state->matrix.type() > QTransform::TxTranslate || (sw != w || sh != h))
         && !d->engine->hasFeature(QPaintEngine::PixmapTransform))
        || (!d->state->matrix.isAffine() && !d->engine->hasFeature(QPaintEngine::PerspectiveTransform))
        || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity)))
    {
        save();
        // If there is no rotation involved we have to make sure we use the
        // antialiased and not the aliased coordinate system by rounding the coordinates.
        if (d->state->matrix.type() <= QTransform::TxScale) {
            const QPointF p = roundInDeviceCoordinates(QPointF(x, y), d->state->matrix);
            x = p.x();
            y = p.y();
        }
 
        if (d->state->matrix.type() <= QTransform::TxTranslate && sw == w && sh == h) {
            sx = qRound(sx);
            sy = qRound(sy);
            sw = qRound(sw);
            sh = qRound(sh);
        }
        translate(x, y);
        scale(w / sw, h / sh);
        setBackgroundMode(Qt::TransparentMode);
        setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform);
        QBrush brush(image);
        setBrush(brush);
        setPen(Qt::NoPen);
        setBrushOrigin(QPointF(-sx, -sy));
 
        drawRect(QRectF(0, 0, sw, sh));
        restore();
        return;
    }
 
    if (d->state->matrix.type() == QTransform::TxTranslate
        && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) {
        x += d->state->matrix.dx();
        y += d->state->matrix.dy();
    }
 
    d->engine->drawImage(QRectF(x, y, w, h), image, QRectF(sx, sy, sw, sh), flags);
}
 
#if !defined(QT_NO_RAWFONT)
void QPainter::drawGlyphRun(const QPointF &position, const QGlyphRun &glyphRun)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::drawGlyphRun: Painter not active");
        return;
    }
 
    QRawFont font = glyphRun.rawFont();
    if (!font.isValid())
        return;
 
    QGlyphRunPrivate *glyphRun_d = QGlyphRunPrivate::get(glyphRun);
 
    const quint32 *glyphIndexes = glyphRun_d->glyphIndexData;
    const QPointF *glyphPositions = glyphRun_d->glyphPositionData;
 
    int count = qMin(glyphRun_d->glyphIndexDataSize, glyphRun_d->glyphPositionDataSize);
    QVarLengthArray<QFixedPoint, 128> fixedPointPositions(count);
 
    QRawFontPrivate *fontD = QRawFontPrivate::get(font);
    bool engineRequiresPretransformedGlyphPositions = d->extended
        ? d->extended->requiresPretransformedGlyphPositions(fontD->fontEngine, d->state->matrix)
        : d->engine->type() != QPaintEngine::CoreGraphics && !d->state->matrix.isAffine();
 
    for (int i=0; i<count; ++i) {
        QPointF processedPosition = position + glyphPositions[i];
        if (engineRequiresPretransformedGlyphPositions)
            processedPosition = d->state->transform().map(processedPosition);
        fixedPointPositions[i] = QFixedPoint::fromPointF(processedPosition);
    }
 
    d->drawGlyphs(engineRequiresPretransformedGlyphPositions
                    ? d->state->transform().map(position)
                    : position,
                  glyphIndexes,
                  fixedPointPositions.data(),
                  count,
                  fontD->fontEngine,
                  glyphRun.overline(),
                  glyphRun.underline(),
                  glyphRun.strikeOut());
}
 
void QPainterPrivate::drawGlyphs(const QPointF &decorationPosition,
                                 const quint32 *glyphArray,
                                 QFixedPoint *positions,
                                 int glyphCount,
                                 QFontEngine *fontEngine,
                                 bool overline,
                                 bool underline,
                                 bool strikeOut)
{
    Q_Q(QPainter);
 
    updateState(state);
 
    if (extended != nullptr && state->matrix.isAffine()) {
        QStaticTextItem staticTextItem;
        staticTextItem.color = state->pen.color();
        staticTextItem.font = state->font;
        staticTextItem.setFontEngine(fontEngine);
        staticTextItem.numGlyphs = glyphCount;
        staticTextItem.glyphs = reinterpret_cast<glyph_t *>(const_cast<glyph_t *>(glyphArray));
        staticTextItem.glyphPositions = positions;
        // The font property is meaningless, the fontengine must be used directly:
        staticTextItem.usesRawFont = true;
 
        extended->drawStaticTextItem(&staticTextItem);
    } else {
        QTextItemInt textItem;
        textItem.fontEngine = fontEngine;
 
        QVarLengthArray<QFixed, 128> advances(glyphCount);
        QVarLengthArray<QGlyphJustification, 128> glyphJustifications(glyphCount);
        QVarLengthArray<QGlyphAttributes, 128> glyphAttributes(glyphCount);
        memset(glyphAttributes.data(), 0, glyphAttributes.size() * sizeof(QGlyphAttributes));
        memset(static_cast<void *>(advances.data()), 0, advances.size() * sizeof(QFixed));
        memset(static_cast<void *>(glyphJustifications.data()), 0, glyphJustifications.size() * sizeof(QGlyphJustification));
 
        textItem.glyphs.numGlyphs = glyphCount;
        textItem.glyphs.glyphs = const_cast<glyph_t *>(glyphArray);
        textItem.glyphs.offsets = positions;
        textItem.glyphs.advances = advances.data();
        textItem.glyphs.justifications = glyphJustifications.data();
        textItem.glyphs.attributes = glyphAttributes.data();
 
        engine->drawTextItem(QPointF(0, 0), textItem);
    }
 
    qt_draw_decoration_for_glyphs(q,
                                  decorationPosition,
                                  glyphArray,
                                  positions,
                                  glyphCount,
                                  fontEngine,
                                  underline,
                                  overline,
                                  strikeOut);
}
#endif // QT_NO_RAWFONT
 
void QPainter::drawText(const QPointF &p, const QString &str)
{
    drawText(p, str, 0, 0);
}
 
void QPainter::drawStaticText(const QPointF &topLeftPosition, const QStaticText &staticText)
{
    Q_D(QPainter);
    if (!d->engine || staticText.text().isEmpty() || pen().style() == Qt::NoPen)
        return;
 
    QStaticTextPrivate *staticText_d =
            const_cast<QStaticTextPrivate *>(QStaticTextPrivate::get(&staticText));
 
    QFontPrivate *fp = QFontPrivate::get(font());
    QFontPrivate *stfp = QFontPrivate::get(staticText_d->font);
    if (font() != staticText_d->font || fp == nullptr || stfp == nullptr || fp->dpi != stfp->dpi) {
        staticText_d->font = font();
        staticText_d->needsRelayout = true;
    } else if (stfp->engineData == nullptr || stfp->engineData->fontCacheId != QFontCache::instance()->id()) {
        staticText_d->needsRelayout = true;
    }
 
    QFontEngine *fe = staticText_d->font.d->engineForScript(QChar::Script_Common);
    if (fe->type() == QFontEngine::Multi)
        fe = static_cast<QFontEngineMulti *>(fe)->engine(0);
 
    // If we don't have an extended paint engine, if the painter is projected,
    // or if the font engine does not support the matrix, we go through standard
    // code path
    if (d->extended == nullptr
            || !d->state->matrix.isAffine()
            || !fe->supportsTransformation(d->state->matrix)) {
        staticText_d->paintText(topLeftPosition, this, pen().color());
        return;
    }
 
    bool engineRequiresPretransform = d->extended->requiresPretransformedGlyphPositions(fe, d->state->matrix);
    if (staticText_d->untransformedCoordinates && engineRequiresPretransform) {
        // The coordinates are untransformed, and the engine can't deal with that
        // nativly, so we have to pre-transform the static text.
        staticText_d->untransformedCoordinates = false;
        staticText_d->needsRelayout = true;
    } else if (!staticText_d->untransformedCoordinates && !engineRequiresPretransform) {
        // The coordinates are already transformed, but the engine can handle that
        // nativly, so undo the transform of the static text.
        staticText_d->untransformedCoordinates = true;
        staticText_d->needsRelayout = true;
    }
 
    // Don't recalculate entire layout because of translation, rather add the dx and dy
    // into the position to move each text item the correct distance.
    QPointF transformedPosition = topLeftPosition;
    if (!staticText_d->untransformedCoordinates)
        transformedPosition = transformedPosition * d->state->matrix;
    QTransform oldMatrix;
 
    // The translation has been applied to transformedPosition. Remove translation
    // component from matrix.
    if (d->state->matrix.isTranslating() && !staticText_d->untransformedCoordinates) {
        qreal m11 = d->state->matrix.m11();
        qreal m12 = d->state->matrix.m12();
        qreal m13 = d->state->matrix.m13();
        qreal m21 = d->state->matrix.m21();
        qreal m22 = d->state->matrix.m22();
        qreal m23 = d->state->matrix.m23();
        qreal m33 = d->state->matrix.m33();
 
        oldMatrix = d->state->matrix;
        d->state->matrix.setMatrix(m11, m12, m13,
                                   m21, m22, m23,
                                   0.0, 0.0, m33);
    }
 
    // If the transform is not identical to the text transform,
    // we have to relayout the text (for other transformations than plain translation)
    bool staticTextNeedsReinit = staticText_d->needsRelayout;
    if (!staticText_d->untransformedCoordinates && staticText_d->matrix != d->state->matrix) {
        staticText_d->matrix = d->state->matrix;
        staticTextNeedsReinit = true;
    }
 
    // Recreate the layout of the static text because the matrix or font has changed
    if (staticTextNeedsReinit)
        staticText_d->init();
 
    if (transformedPosition != staticText_d->position) { // Translate to actual position
        QFixed fx = QFixed::fromReal(transformedPosition.x());
        QFixed fy = QFixed::fromReal(transformedPosition.y());
        QFixed oldX = QFixed::fromReal(staticText_d->position.x());
        QFixed oldY = QFixed::fromReal(staticText_d->position.y());
        for (int item=0; item<staticText_d->itemCount;++item) {
            QStaticTextItem *textItem = staticText_d->items + item;
            for (int i=0; i<textItem->numGlyphs; ++i) {
                textItem->glyphPositions[i].x += fx - oldX;
                textItem->glyphPositions[i].y += fy - oldY;
            }
            textItem->userDataNeedsUpdate = true;
        }
 
        staticText_d->position = transformedPosition;
    }
 
    QPen oldPen = d->state->pen;
    QColor currentColor = oldPen.color();
    static const QColor bodyIndicator(0, 0, 0, 0);
    for (int i=0; i<staticText_d->itemCount; ++i) {
        QStaticTextItem *item = staticText_d->items + i;
        if (item->color.isValid() && currentColor != item->color
            && item->color != bodyIndicator) {
                setPen(item->color);
                currentColor = item->color;
        } else if (item->color == bodyIndicator) {
            setPen(oldPen);
            currentColor = oldPen.color();
        }
        d->extended->drawStaticTextItem(item);
 
        qt_draw_decoration_for_glyphs(this,
                                      topLeftPosition,
                                      item->glyphs,
                                      item->glyphPositions,
                                      item->numGlyphs,
                                      item->fontEngine(),
                                      staticText_d->font.underline(),
                                      staticText_d->font.overline(),
                                      staticText_d->font.strikeOut());
    }
    if (currentColor != oldPen.color())
        setPen(oldPen);
 
    if (!staticText_d->untransformedCoordinates && oldMatrix.isTranslating())
        d->state->matrix = oldMatrix;
}
 
void QPainter::drawText(const QPointF &p, const QString &str, int tf, int justificationPadding)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawText(), pos=[%.2f,%.2f], str='%s'\n", p.x(), p.y(), str.toLatin1().constData());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || str.isEmpty() || pen().style() == Qt::NoPen)
        return;
 
    QStackTextEngine engine(str, d->state->font);
    engine.option.setTextDirection(d->state->layoutDirection);
    if (tf & (Qt::TextForceLeftToRight|Qt::TextForceRightToLeft)) {
        engine.ignoreBidi = true;
        engine.option.setTextDirection((tf & Qt::TextForceLeftToRight) ? Qt::LeftToRight : Qt::RightToLeft);
    }
    engine.itemize();
    QScriptLine line;
    line.length = str.size();
    engine.shapeLine(line);
 
    int nItems = engine.layoutData->items.size();
    QVarLengthArray<int> visualOrder(nItems);
    QVarLengthArray<uchar> levels(nItems);
    for (int i = 0; i < nItems; ++i)
        levels[i] = engine.layoutData->items[i].analysis.bidiLevel;
    QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data());
 
    if (justificationPadding > 0) {
        engine.option.setAlignment(Qt::AlignJustify);
        engine.forceJustification = true;
        // this works because justify() is only interested in the difference between width and textWidth
        line.width = justificationPadding;
        engine.justify(line);
    }
    QFixed x = QFixed::fromReal(p.x());
 
    for (int i = 0; i < nItems; ++i) {
        int item = visualOrder[i];
        const QScriptItem &si = engine.layoutData->items.at(item);
        if (si.analysis.flags >= QScriptAnalysis::TabOrObject) {
            x += si.width;
            continue;
        }
        QFont f = engine.font(si);
        QTextItemInt gf(si, &f);
        gf.glyphs = engine.shapedGlyphs(&si);
        gf.chars = engine.layoutData->string.unicode() + si.position;
        gf.num_chars = engine.length(item);
        if (engine.forceJustification) {
            for (int j=0; j<gf.glyphs.numGlyphs; ++j)
                gf.width += gf.glyphs.effectiveAdvance(j);
        } else {
            gf.width = si.width;
        }
        gf.logClusters = engine.logClusters(&si);
 
        drawTextItem(QPointF(x.toReal(), p.y()), gf);
 
        x += gf.width;
    }
}
 
void QPainter::drawText(const QRect &r, int flags, const QString &str, QRect *br)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawText(), r=[%d,%d,%d,%d], flags=%d, str='%s'\n",
           r.x(), r.y(), r.width(), r.height(), flags, str.toLatin1().constData());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || str.size() == 0 || pen().style() == Qt::NoPen)
        return;
 
    if (!d->extended)
        d->updateState(d->state);
 
    QRectF bounds;
    qt_format_text(d->state->font, r, flags, nullptr, str, br ? &bounds : nullptr, 0, nullptr, 0, this);
    if (br)
        *br = bounds.toAlignedRect();
}
 
void QPainter::drawText(const QRectF &r, int flags, const QString &str, QRectF *br)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawText(), r=[%.2f,%.2f,%.2f,%.2f], flags=%d, str='%s'\n",
           r.x(), r.y(), r.width(), r.height(), flags, str.toLatin1().constData());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || str.size() == 0 || pen().style() == Qt::NoPen)
        return;
 
    if (!d->extended)
        d->updateState(d->state);
 
    qt_format_text(d->state->font, r, flags, nullptr, str, br, 0, nullptr, 0, this);
}
 
void QPainter::drawText(const QRectF &r, const QString &text, const QTextOption &o)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawText(), r=[%.2f,%.2f,%.2f,%.2f], str='%s'\n",
           r.x(), r.y(), r.width(), r.height(), text.toLatin1().constData());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine || text.size() == 0 || pen().style() == Qt::NoPen)
        return;
 
    if (!d->extended)
        d->updateState(d->state);
 
    qt_format_text(d->state->font, r, 0, &o, text, nullptr, 0, nullptr, 0, this);
}
 
static QPixmap generateWavyPixmap(qreal maxRadius, const QPen &pen)
{
    const qreal radiusBase = qMax(qreal(1), maxRadius);
 
    QString key = "WaveUnderline-"_L1
                  % pen.color().name()
                  % HexString<qreal>(radiusBase)
                  % HexString<qreal>(pen.widthF());
 
    QPixmap pixmap;
    if (QPixmapCache::find(key, &pixmap))
        return pixmap;
 
    const qreal halfPeriod = qMax(qreal(2), qreal(radiusBase * 1.61803399)); // the golden ratio
    const int width = qCeil(100 / (2 * halfPeriod)) * (2 * halfPeriod);
    const qreal radius = qFloor(radiusBase * 2) / 2.;
 
    QPainterPath path;
 
    qreal xs = 0;
    qreal ys = radius;
 
    while (xs < width) {
        xs += halfPeriod;
        ys = -ys;
        path.quadTo(xs - halfPeriod / 2, ys, xs, 0);
    }
 
    pixmap = QPixmap(width, radius * 2);
    pixmap.fill(Qt::transparent);
    {
        QPen wavePen = pen;
        wavePen.setCapStyle(Qt::SquareCap);
 
        // This is to protect against making the line too fat, as happens on OS X
        // due to it having a rather thick width for the regular underline.
        const qreal maxPenWidth = .8 * radius;
        if (wavePen.widthF() > maxPenWidth)
            wavePen.setWidthF(maxPenWidth);
 
        QPainter imgPainter(&pixmap);
        imgPainter.setPen(wavePen);
        imgPainter.setRenderHint(QPainter::Antialiasing);
        imgPainter.translate(0, radius);
        imgPainter.drawPath(path);
    }
 
    QPixmapCache::insert(key, pixmap);
 
    return pixmap;
}
 
static void drawTextItemDecoration(QPainter *painter, const QPointF &pos, const QFontEngine *fe, QTextEngine *textEngine,
                                   QTextCharFormat::UnderlineStyle underlineStyle,
                                   QTextItem::RenderFlags flags, qreal width,
                                   const QTextCharFormat &charFormat)
{
    if (underlineStyle == QTextCharFormat::NoUnderline
        && !(flags & (QTextItem::StrikeOut | QTextItem::Overline)))
        return;
 
    const QPen oldPen = painter->pen();
    const QBrush oldBrush = painter->brush();
    painter->setBrush(Qt::NoBrush);
    QPen pen = oldPen;
    pen.setStyle(Qt::SolidLine);
    pen.setWidthF(fe->lineThickness().toReal());
    pen.setCapStyle(Qt::FlatCap);
 
    QLineF line(qFloor(pos.x()), pos.y(), qFloor(pos.x() + width), pos.y());
 
    const qreal underlineOffset = fe->underlinePosition().toReal();
 
    if (underlineStyle == QTextCharFormat::SpellCheckUnderline) {
        QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme();
        if (theme)
            underlineStyle = QTextCharFormat::UnderlineStyle(theme->themeHint(QPlatformTheme::SpellCheckUnderlineStyle).toInt());
        if (underlineStyle == QTextCharFormat::SpellCheckUnderline) // still not resolved
            underlineStyle = QTextCharFormat::WaveUnderline;
    }
 
    if (underlineStyle == QTextCharFormat::WaveUnderline) {
        painter->save();
        painter->translate(0, pos.y() + 1);
        qreal maxHeight = fe->descent().toReal() - qreal(1);
 
        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);
 
        // Adapt wave to underlineOffset or pen width, whatever is larger, to make it work on all platforms
        const QPixmap wave = generateWavyPixmap(qMin(qMax(underlineOffset, pen.widthF()), maxHeight / qreal(2.)), pen);
        const int descent = qFloor(maxHeight);
 
        painter->setBrushOrigin(painter->brushOrigin().x(), 0);
        painter->fillRect(pos.x(), 0, qCeil(width), qMin(wave.height(), descent), wave);
        painter->restore();
    } else if (underlineStyle != QTextCharFormat::NoUnderline) {
        // Deliberately ceil the offset to avoid the underline coming too close to
        // the text above it, but limit it to stay within descent.
        qreal adjustedUnderlineOffset = std::ceil(underlineOffset) + 0.5;
        if (underlineOffset <= fe->descent().toReal())
            adjustedUnderlineOffset = qMin(adjustedUnderlineOffset, fe->descent().toReal() - qreal(0.5));
        const qreal underlinePos = pos.y() + adjustedUnderlineOffset;
        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);
 
        pen.setStyle((Qt::PenStyle)(underlineStyle));
        painter->setPen(pen);
        QLineF underline(line.x1(), underlinePos, line.x2(), underlinePos);
        if (textEngine)
            textEngine->addUnderline(painter, underline);
        else
            painter->drawLine(underline);
    }
 
    pen.setStyle(Qt::SolidLine);
    pen.setColor(oldPen.color());
 
    if (flags & QTextItem::StrikeOut) {
        QLineF strikeOutLine = line;
        strikeOutLine.translate(0., - fe->ascent().toReal() / 3.);
        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);
        painter->setPen(pen);
        if (textEngine)
            textEngine->addStrikeOut(painter, strikeOutLine);
        else
            painter->drawLine(strikeOutLine);
    }
 
    if (flags & QTextItem::Overline) {
        QLineF overline = line;
        overline.translate(0., - fe->ascent().toReal());
        QColor uc = charFormat.underlineColor();
        if (uc.isValid())
            pen.setColor(uc);
        painter->setPen(pen);
        if (textEngine)
            textEngine->addOverline(painter, overline);
        else
            painter->drawLine(overline);
    }
 
    painter->setPen(oldPen);
    painter->setBrush(oldBrush);
}
 
static void qt_draw_decoration_for_glyphs(QPainter *painter,
                                          const QPointF &decorationPosition,
                                          const glyph_t *glyphArray,
                                          const QFixedPoint *positions,
                                          int glyphCount,
                                          QFontEngine *fontEngine,
                                          bool underline,
                                          bool overline,
                                          bool strikeOut)
{
    if (!underline && !overline && !strikeOut)
        return;
 
    QTextItem::RenderFlags flags;
    if (underline)
        flags |= QTextItem::Underline;
    if (overline)
        flags |= QTextItem::Overline;
    if (strikeOut)
        flags |= QTextItem::StrikeOut;
 
    bool rtl = positions[glyphCount - 1].x < positions[0].x;
    QFixed baseline = positions[0].y;
    glyph_metrics_t gm = fontEngine->boundingBox(glyphArray[rtl ? 0 : glyphCount - 1]);
 
    qreal width = rtl
            ? (positions[0].x + gm.xoff - positions[glyphCount - 1].x).toReal()
            : (positions[glyphCount - 1].x + gm.xoff - positions[0].x).toReal();
 
    drawTextItemDecoration(painter,
                           QPointF(decorationPosition.x(), baseline.toReal()),
                           fontEngine,
                           nullptr, // textEngine
                           underline ? QTextCharFormat::SingleUnderline
                                     : QTextCharFormat::NoUnderline,
                           flags,
                           width,
                           QTextCharFormat());
}
 
void QPainter::drawTextItem(const QPointF &p, const QTextItem &ti)
{
    Q_D(QPainter);
 
    d->drawTextItem(p, ti, static_cast<QTextEngine *>(nullptr));
}
 
void QPainterPrivate::drawTextItem(const QPointF &p, const QTextItem &_ti, QTextEngine *textEngine)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawTextItem(), pos=[%.f,%.f], str='%s'\n",
               p.x(), p.y(), qPrintable(_ti.text()));
#endif
 
    Q_Q(QPainter);
 
    if (!engine)
        return;
 
    QTextItemInt &ti = const_cast<QTextItemInt &>(static_cast<const QTextItemInt &>(_ti));
 
    if (!extended && state->bgMode == Qt::OpaqueMode) {
        QRectF rect(p.x(), p.y() - ti.ascent.toReal(), ti.width.toReal(), (ti.ascent + ti.descent).toReal());
        q->fillRect(rect, state->bgBrush);
    }
 
    if (q->pen().style() == Qt::NoPen)
        return;
 
    const QPainter::RenderHints oldRenderHints = state->renderHints;
    if (!(state->renderHints & QPainter::Antialiasing) && state->matrix.type() >= QTransform::TxScale) {
        // draw antialias decoration (underline/overline/strikeout) with
        // transformed text
 
        bool aa = true;
        const QTransform &m = state->matrix;
        if (state->matrix.type() < QTransform::TxShear) {
            bool isPlain90DegreeRotation =
                (qFuzzyIsNull(m.m11())
                 && qFuzzyIsNull(m.m12() - qreal(1))
                 && qFuzzyIsNull(m.m21() + qreal(1))
                 && qFuzzyIsNull(m.m22())
                    )
                ||
                (qFuzzyIsNull(m.m11() + qreal(1))
                 && qFuzzyIsNull(m.m12())
                 && qFuzzyIsNull(m.m21())
                 && qFuzzyIsNull(m.m22() + qreal(1))
                    )
                ||
                (qFuzzyIsNull(m.m11())
                 && qFuzzyIsNull(m.m12() + qreal(1))
                 && qFuzzyIsNull(m.m21() - qreal(1))
                 && qFuzzyIsNull(m.m22())
                    )
                ;
            aa = !isPlain90DegreeRotation;
        }
        if (aa)
            q->setRenderHint(QPainter::Antialiasing, true);
    }
 
    if (!extended)
        updateState(state);
 
    if (!ti.glyphs.numGlyphs) {
        drawTextItemDecoration(q, p, ti.fontEngine, textEngine, ti.underlineStyle,
            ti.flags, ti.width.toReal(), ti.charFormat);
    } else if (ti.fontEngine->type() == QFontEngine::Multi) {
        QFontEngineMulti *multi = static_cast<QFontEngineMulti *>(ti.fontEngine);
 
        const QGlyphLayout &glyphs = ti.glyphs;
        int which = glyphs.glyphs[0] >> 24;
 
        qreal x = p.x();
        qreal y = p.y();
 
        bool rtl = ti.flags & QTextItem::RightToLeft;
        if (rtl)
            x += ti.width.toReal();
 
        int start = 0;
        int end, i;
        for (end = 0; end < ti.glyphs.numGlyphs; ++end) {
            const int e = glyphs.glyphs[end] >> 24;
            if (e == which)
                continue;
 
 
            multi->ensureEngineAt(which);
            QTextItemInt ti2 = ti.midItem(multi->engine(which), start, end - start);
            ti2.width = 0;
            // set the high byte to zero and calc the width
            for (i = start; i < end; ++i) {
                glyphs.glyphs[i] = glyphs.glyphs[i] & 0xffffff;
                ti2.width += ti.glyphs.effectiveAdvance(i);
            }
 
            if (rtl)
                x -= ti2.width.toReal();
 
            if (extended)
                extended->drawTextItem(QPointF(x, y), ti2);
            else
                engine->drawTextItem(QPointF(x, y), ti2);
            drawTextItemDecoration(q, QPointF(x, y), ti2.fontEngine, textEngine, ti2.underlineStyle,
                                   ti2.flags, ti2.width.toReal(), ti2.charFormat);
 
            if (!rtl)
                x += ti2.width.toReal();
 
            // reset the high byte for all glyphs and advance to the next sub-string
            const int hi = which << 24;
            for (i = start; i < end; ++i) {
                glyphs.glyphs[i] = hi | glyphs.glyphs[i];
            }
 
            // change engine
            start = end;
            which = e;
        }
 
        multi->ensureEngineAt(which);
        QTextItemInt ti2 = ti.midItem(multi->engine(which), start, end - start);
        ti2.width = 0;
        // set the high byte to zero and calc the width
        for (i = start; i < end; ++i) {
            glyphs.glyphs[i] = glyphs.glyphs[i] & 0xffffff;
            ti2.width += ti.glyphs.effectiveAdvance(i);
        }
 
        if (rtl)
            x -= ti2.width.toReal();
 
        if (extended)
            extended->drawTextItem(QPointF(x, y), ti2);
        else
            engine->drawTextItem(QPointF(x,y), ti2);
        drawTextItemDecoration(q, QPointF(x, y), ti2.fontEngine, textEngine, ti2.underlineStyle,
                               ti2.flags, ti2.width.toReal(), ti2.charFormat);
 
        // reset the high byte for all glyphs
        const int hi = which << 24;
        for (i = start; i < end; ++i)
            glyphs.glyphs[i] = hi | glyphs.glyphs[i];
 
    } else {
        if (extended)
            extended->drawTextItem(p, ti);
        else
            engine->drawTextItem(p, ti);
        drawTextItemDecoration(q, p, ti.fontEngine, textEngine, ti.underlineStyle,
                               ti.flags, ti.width.toReal(), ti.charFormat);
    }
 
    if (state->renderHints != oldRenderHints) {
        state->renderHints = oldRenderHints;
        if (extended)
            extended->renderHintsChanged();
        else
            state->dirtyFlags |= QPaintEngine::DirtyHints;
    }
}
 
QRect QPainter::boundingRect(const QRect &rect, int flags, const QString &str)
{
    if (str.isEmpty())
        return QRect(rect.x(),rect.y(), 0,0);
    QRect brect;
    drawText(rect, flags | Qt::TextDontPrint, str, &brect);
    return brect;
}
 
 
 
QRectF QPainter::boundingRect(const QRectF &rect, int flags, const QString &str)
{
    if (str.isEmpty())
        return QRectF(rect.x(),rect.y(), 0,0);
    QRectF brect;
    drawText(rect, flags | Qt::TextDontPrint, str, &brect);
    return brect;
}
 
QRectF QPainter::boundingRect(const QRectF &r, const QString &text, const QTextOption &o)
{
    Q_D(QPainter);
 
    if (!d->engine || text.size() == 0)
        return QRectF(r.x(),r.y(), 0,0);
 
    QRectF br;
    qt_format_text(d->state->font, r, Qt::TextDontPrint, &o, text, &br, 0, nullptr, 0, this);
    return br;
}
 
void QPainter::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &sp)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::drawTiledPixmap(), target=[%.2f,%.2f,%.2f,%.2f], pix=[%d,%d], offset=[%.2f,%.2f]\n",
               r.x(), r.y(), r.width(), r.height(),
               pixmap.width(), pixmap.height(),
               sp.x(), sp.y());
#endif
 
    Q_D(QPainter);
    if (!d->engine || pixmap.isNull() || r.isEmpty())
        return;
 
#ifndef QT_NO_DEBUG
    qt_painter_thread_test(d->device->devType(), d->engine->type(), "drawTiledPixmap()");
#endif
 
    qreal sw = pixmap.width();
    qreal sh = pixmap.height();
    qreal sx = sp.x();
    qreal sy = sp.y();
    if (sx < 0)
        sx = qRound(sw) - qRound(-sx) % qRound(sw);
    else
        sx = qRound(sx) % qRound(sw);
    if (sy < 0)
        sy = qRound(sh) - -qRound(sy) % qRound(sh);
    else
        sy = qRound(sy) % qRound(sh);
 
 
    if (d->extended) {
        d->extended->drawTiledPixmap(r, pixmap, QPointF(sx, sy));
        return;
    }
 
    if (d->state->bgMode == Qt::OpaqueMode && pixmap.isQBitmap())
        fillRect(r, d->state->bgBrush);
 
    d->updateState(d->state);
    if ((d->state->matrix.type() > QTransform::TxTranslate
        && !d->engine->hasFeature(QPaintEngine::PixmapTransform))
        || (d->state->opacity != 1.0 && !d->engine->hasFeature(QPaintEngine::ConstantOpacity)))
    {
        save();
        setBackgroundMode(Qt::TransparentMode);
        setRenderHint(Antialiasing, renderHints() & SmoothPixmapTransform);
        setBrush(QBrush(d->state->pen.color(), pixmap));
        setPen(Qt::NoPen);
 
        // If there is no rotation involved we have to make sure we use the
        // antialiased and not the aliased coordinate system by rounding the coordinates.
        if (d->state->matrix.type() <= QTransform::TxScale) {
            const QPointF p = roundInDeviceCoordinates(r.topLeft(), d->state->matrix);
 
            if (d->state->matrix.type() <= QTransform::TxTranslate) {
                sx = qRound(sx);
                sy = qRound(sy);
            }
 
            setBrushOrigin(QPointF(r.x()-sx, r.y()-sy));
            drawRect(QRectF(p, r.size()));
        } else {
            setBrushOrigin(QPointF(r.x()-sx, r.y()-sy));
            drawRect(r);
        }
        restore();
        return;
    }
 
    qreal x = r.x();
    qreal y = r.y();
    if (d->state->matrix.type() == QTransform::TxTranslate
        && !d->engine->hasFeature(QPaintEngine::PixmapTransform)) {
        x += d->state->matrix.dx();
        y += d->state->matrix.dy();
    }
 
    d->engine->drawTiledPixmap(QRectF(x, y, r.width(), r.height()), pixmap, QPointF(sx, sy));
}
 
#ifndef QT_NO_PICTURE
 
void QPainter::drawPicture(const QPointF &p, const QPicture &picture)
{
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (!d->extended)
        d->updateState(d->state);
 
    save();
    translate(p);
    const_cast<QPicture *>(&picture)->play(this);
    restore();
}
 
#endif // QT_NO_PICTURE
 
void QPainter::eraseRect(const QRectF &r)
{
    Q_D(QPainter);
 
    fillRect(r, d->state->bgBrush);
}
 
static inline bool needsResolving(const QBrush &brush)
{
    Qt::BrushStyle s = brush.style();
    return ((s == Qt::LinearGradientPattern || s == Qt::RadialGradientPattern ||
             s == Qt::ConicalGradientPattern) &&
            (brush.gradient()->coordinateMode() == QGradient::ObjectBoundingMode ||
             brush.gradient()->coordinateMode() == QGradient::ObjectMode));
}
 
void QPainter::fillRect(const QRectF &r, const QBrush &brush)
{
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (d->extended && !needsEmulation(brush)) {
        d->extended->fillRect(r, brush);
        return;
    }
 
    QPen oldPen = pen();
    QBrush oldBrush = this->brush();
    setPen(Qt::NoPen);
    if (brush.style() == Qt::SolidPattern) {
        d->colorBrush.setStyle(Qt::SolidPattern);
        d->colorBrush.setColor(brush.color());
        setBrush(d->colorBrush);
    } else {
        setBrush(brush);
    }
 
    drawRect(r);
    setBrush(oldBrush);
    setPen(oldPen);
}
 
void QPainter::fillRect(const QRect &r, const QBrush &brush)
{
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (d->extended && !needsEmulation(brush)) {
        d->extended->fillRect(r, brush);
        return;
    }
 
    QPen oldPen = pen();
    QBrush oldBrush = this->brush();
    setPen(Qt::NoPen);
    if (brush.style() == Qt::SolidPattern) {
        d->colorBrush.setStyle(Qt::SolidPattern);
        d->colorBrush.setColor(brush.color());
        setBrush(d->colorBrush);
    } else {
        setBrush(brush);
    }
 
    drawRect(r);
    setBrush(oldBrush);
    setPen(oldPen);
}
 
 
 
void QPainter::fillRect(const QRect &r, const QColor &color)
{
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (d->extended) {
        d->extended->fillRect(r, color);
        return;
    }
 
    fillRect(r, QBrush(color));
}
 
 
void QPainter::fillRect(const QRectF &r, const QColor &color)
{
    Q_D(QPainter);
 
    if (!d->engine)
        return;
 
    if (d->extended) {
        d->extended->fillRect(r, color);
        return;
    }
 
    fillRect(r, QBrush(color));
}
 
void QPainter::setRenderHint(RenderHint hint, bool on)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setRenderHint: hint=%x, %s\n", hint, on ? "on" : "off");
#endif
 
#ifndef QT_NO_DEBUG
    static const bool antialiasingDisabled = qEnvironmentVariableIntValue("QT_NO_ANTIALIASING");
    if (hint == QPainter::Antialiasing && antialiasingDisabled)
        return;
#endif
 
    setRenderHints(hint, on);
}
 
void QPainter::setRenderHints(RenderHints hints, bool on)
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setRenderHint: Painter must be active to set rendering hints");
        return;
    }
 
    if (on)
        d->state->renderHints |= hints;
    else
        d->state->renderHints &= ~hints;
 
    if (d->extended)
        d->extended->renderHintsChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyHints;
}
 
QPainter::RenderHints QPainter::renderHints() const
{
    Q_D(const QPainter);
 
    if (!d->engine)
        return { };
 
    return d->state->renderHints;
}
 
bool QPainter::viewTransformEnabled() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::viewTransformEnabled: Painter not active");
        return false;
    }
    return d->state->VxF;
}
 
void QPainter::setWindow(const QRect &r)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setWindow(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setWindow: Painter not active");
        return;
    }
 
    d->state->wx = r.x();
    d->state->wy = r.y();
    d->state->ww = r.width();
    d->state->wh = r.height();
 
    d->state->VxF = true;
    d->updateMatrix();
}
 
QRect QPainter::window() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::window: Painter not active");
        return QRect();
    }
    return QRect(d->state->wx, d->state->wy, d->state->ww, d->state->wh);
}
 
void QPainter::setViewport(const QRect &r)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setViewport(), [%d,%d,%d,%d]\n", r.x(), r.y(), r.width(), r.height());
#endif
 
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setViewport: Painter not active");
        return;
    }
 
    d->state->vx = r.x();
    d->state->vy = r.y();
    d->state->vw = r.width();
    d->state->vh = r.height();
 
    d->state->VxF = true;
    d->updateMatrix();
}
 
QRect QPainter::viewport() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::viewport: Painter not active");
        return QRect();
    }
    return QRect(d->state->vx, d->state->vy, d->state->vw, d->state->vh);
}
 
void QPainter::setViewTransformEnabled(bool enable)
{
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::setViewTransformEnabled(), enable=%d\n", enable);
#endif
 
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setViewTransformEnabled: Painter not active");
        return;
    }
 
    if (enable == d->state->VxF)
        return;
 
    d->state->VxF = enable;
    d->updateMatrix();
}
 
void qt_format_text(const QFont &fnt, const QRectF &_r,
                    int tf, const QString& str, QRectF *brect,
                    int tabstops, int *ta, int tabarraylen,
                    QPainter *painter)
{
    qt_format_text(fnt, _r,
                    tf, nullptr, str, brect,
                    tabstops, ta, tabarraylen,
                    painter);
}
void qt_format_text(const QFont &fnt, const QRectF &_r,
                    int tf, const QTextOption *option, const QString& str, QRectF *brect,
                    int tabstops, int *ta, int tabarraylen,
                    QPainter *painter)
{
 
    Q_ASSERT( !((tf & ~Qt::TextDontPrint)!=0 && option!=nullptr) ); // we either have an option or flags
 
    if (option) {
        tf |= option->alignment();
        if (option->wrapMode() != QTextOption::NoWrap)
            tf |= Qt::TextWordWrap;
 
        if (option->flags() & QTextOption::IncludeTrailingSpaces)
            tf |= Qt::TextIncludeTrailingSpaces;
 
        if (option->tabStopDistance() >= 0 || !option->tabArray().isEmpty())
            tf |= Qt::TextExpandTabs;
    }
 
    // we need to copy r here to protect against the case (&r == brect).
    QRectF r(_r);
 
    bool dontclip  = (tf & Qt::TextDontClip);
    bool wordwrap  = (tf & Qt::TextWordWrap) || (tf & Qt::TextWrapAnywhere);
    bool singleline = (tf & Qt::TextSingleLine);
    bool showmnemonic = (tf & Qt::TextShowMnemonic);
    bool hidemnmemonic = (tf & Qt::TextHideMnemonic);
 
    Qt::LayoutDirection layout_direction;
    if (tf & Qt::TextForceLeftToRight)
        layout_direction = Qt::LeftToRight;
    else if (tf & Qt::TextForceRightToLeft)
        layout_direction = Qt::RightToLeft;
    else if (option)
        layout_direction = option->textDirection();
    else if (painter)
        layout_direction = painter->layoutDirection();
    else
        layout_direction = Qt::LeftToRight;
 
    tf = QGuiApplicationPrivate::visualAlignment(layout_direction, QFlag(tf));
 
    bool isRightToLeft = layout_direction == Qt::RightToLeft;
    bool expandtabs = ((tf & Qt::TextExpandTabs) &&
                        (((tf & Qt::AlignLeft) && !isRightToLeft) ||
                          ((tf & Qt::AlignRight) && isRightToLeft)));
 
    if (!painter)
        tf |= Qt::TextDontPrint;
 
    uint maxUnderlines = 0;
 
    QFontMetricsF fm(fnt);
    QString text = str;
    int offset = 0;
start_lengthVariant:
    bool hasMoreLengthVariants = false;
    // compatible behaviour to the old implementation. Replace
    // tabs by spaces
    int old_offset = offset;
    for (; offset < text.size(); offset++) {
        QChar chr = text.at(offset);
        if (chr == u'\r' || (singleline && chr == u'\n')) {
            text[offset] = u' ';
        } else if (chr == u'\n') {
            text[offset] = QChar::LineSeparator;
        } else if (chr == u'&') {
            ++maxUnderlines;
        } else if (chr == u'\t') {
            if (!expandtabs) {
                text[offset] = u' ';
            } else if (!tabarraylen && !tabstops) {
                tabstops = qRound(fm.horizontalAdvance(u'x')*8);
            }
        } else if (chr == u'\x9c') {
            // string with multiple length variants
            hasMoreLengthVariants = true;
            break;
        }
    }
 
    QList<QTextLayout::FormatRange> underlineFormats;
    int length = offset - old_offset;
    if ((hidemnmemonic || showmnemonic) && maxUnderlines > 0) {
        QChar *cout = text.data() + old_offset;
        QChar *cout0 = cout;
        QChar *cin = cout;
        int l = length;
        while (l) {
            if (*cin == u'&') {
                ++cin;
                --length;
                --l;
                if (!l)
                    break;
                if (*cin != u'&' && !hidemnmemonic && !(tf & Qt::TextDontPrint)) {
                    QTextLayout::FormatRange range;
                    range.start = cout - cout0;
                    range.length = 1;
                    range.format.setFontUnderline(true);
                    underlineFormats.append(range);
                }
#ifdef Q_OS_MAC
            } else if (hidemnmemonic && *cin == u'(' && l >= 4 &&
                       cin[1] == u'&' && cin[2] != u'&' &&
                       cin[3] == u')') {
                int n = 0;
                while ((cout - n) > cout0 && (cout - n - 1)->isSpace())
                    ++n;
                cout -= n;
                cin += 4;
                length -= n + 4;
                l -= 4;
                continue;
#endif //Q_OS_MAC
            }
            *cout = *cin;
            ++cout;
            ++cin;
            --l;
        }
    }
 
    qreal height = 0;
    qreal width = 0;
 
    QString finalText = text.mid(old_offset, length);
    QStackTextEngine engine(finalText, fnt);
    if (option) {
        engine.option = *option;
    }
 
    if (engine.option.tabStopDistance() < 0 && tabstops > 0)
        engine.option.setTabStopDistance(tabstops);
 
    if (engine.option.tabs().isEmpty() && ta) {
        QList<qreal> tabs;
        tabs.reserve(tabarraylen);
        for (int i = 0; i < tabarraylen; i++)
            tabs.append(qreal(ta[i]));
        engine.option.setTabArray(tabs);
    }
 
    engine.option.setTextDirection(layout_direction);
    if (tf & Qt::AlignJustify)
        engine.option.setAlignment(Qt::AlignJustify);
    else
        engine.option.setAlignment(Qt::AlignLeft); // do not do alignment twice
 
    if (!option && (tf & Qt::TextWrapAnywhere))
        engine.option.setWrapMode(QTextOption::WrapAnywhere);
 
    if (tf & Qt::TextJustificationForced)
        engine.forceJustification = true;
    QTextLayout textLayout(&engine);
    textLayout.setCacheEnabled(true);
    textLayout.setFormats(underlineFormats);
 
    if (finalText.isEmpty()) {
        height = fm.height();
        width = 0;
        tf |= Qt::TextDontPrint;
    } else {
        qreal lineWidth = 0x01000000;
        if (wordwrap || (tf & Qt::TextJustificationForced))
            lineWidth = qMax<qreal>(0, r.width());
        if (!wordwrap)
            tf |= Qt::TextIncludeTrailingSpaces;
        textLayout.beginLayout();
 
        qreal leading = fm.leading();
        height = -leading;
 
        while (1) {
            QTextLine l = textLayout.createLine();
            if (!l.isValid())
                break;
 
            l.setLineWidth(lineWidth);
            height += leading;
 
            // Make sure lines are positioned on whole pixels
            height = qCeil(height);
            l.setPosition(QPointF(0., height));
            height += textLayout.engine()->lines[l.lineNumber()].height().toReal();
            width = qMax(width, l.naturalTextWidth());
            if (!dontclip && !brect && height >= r.height())
                break;
        }
        textLayout.endLayout();
    }
 
    qreal yoff = 0;
    qreal xoff = 0;
    if (tf & Qt::AlignBottom)
        yoff = r.height() - height;
    else if (tf & Qt::AlignVCenter)
        yoff = (r.height() - height)/2;
 
    if (tf & Qt::AlignRight)
        xoff = r.width() - width;
    else if (tf & Qt::AlignHCenter)
        xoff = (r.width() - width)/2;
 
    QRectF bounds = QRectF(r.x() + xoff, r.y() + yoff, width, height);
 
    if (hasMoreLengthVariants && !(tf & Qt::TextLongestVariant) && !r.contains(bounds)) {
        offset++;
        goto start_lengthVariant;
    }
    if (brect)
        *brect = bounds;
 
    if (!(tf & Qt::TextDontPrint)) {
        bool restore = false;
        if (!dontclip && !r.contains(bounds)) {
            restore = true;
            painter->save();
            painter->setClipRect(r, Qt::IntersectClip);
        }
 
        for (int i = 0; i < textLayout.lineCount(); i++) {
            QTextLine line = textLayout.lineAt(i);
            QTextEngine *eng = textLayout.engine();
            eng->enableDelayDecorations();
 
            qreal advance = line.horizontalAdvance();
            xoff = 0;
            if (tf & Qt::AlignRight) {
                xoff = r.width() - advance -
                    eng->leadingSpaceWidth(eng->lines[line.lineNumber()]).toReal();
            }
            else if (tf & Qt::AlignHCenter)
                xoff = (r.width() - advance) / 2;
 
            line.draw(painter, QPointF(r.x() + xoff, r.y() + yoff));
            eng->drawDecorations(painter);
        }
 
        if (restore) {
            painter->restore();
        }
    }
}
 
void QPainter::setLayoutDirection(Qt::LayoutDirection direction)
{
    Q_D(QPainter);
    if (d->state)
        d->state->layoutDirection = direction;
}
 
Qt::LayoutDirection QPainter::layoutDirection() const
{
    Q_D(const QPainter);
    return d->state ? d->state->layoutDirection : Qt::LayoutDirectionAuto;
}
 
QPainterState::QPainterState(const QPainterState *s)
    : brushOrigin(s->brushOrigin), font(s->font), deviceFont(s->deviceFont),
      pen(s->pen), brush(s->brush), bgBrush(s->bgBrush),
      clipRegion(s->clipRegion), clipPath(s->clipPath),
      clipOperation(s->clipOperation),
      renderHints(s->renderHints), clipInfo(s->clipInfo),
      worldMatrix(s->worldMatrix), matrix(s->matrix), redirectionMatrix(s->redirectionMatrix),
      wx(s->wx), wy(s->wy), ww(s->ww), wh(s->wh),
      vx(s->vx), vy(s->vy), vw(s->vw), vh(s->vh),
      opacity(s->opacity), WxF(s->WxF), VxF(s->VxF),
      clipEnabled(s->clipEnabled), bgMode(s->bgMode), painter(s->painter),
      layoutDirection(s->layoutDirection),
      composition_mode(s->composition_mode),
      emulationSpecifier(s->emulationSpecifier), changeFlags(0)
{
    dirtyFlags = s->dirtyFlags;
}
 
QPainterState::QPainterState()
    : brushOrigin(0, 0), WxF(false), VxF(false), clipEnabled(true),
      layoutDirection(QGuiApplication::layoutDirection())
{
}
 
QPainterState::~QPainterState()
{
}
 
void QPainterState::init(QPainter *p) {
    bgBrush = Qt::white;
    bgMode = Qt::TransparentMode;
    WxF = false;
    VxF = false;
    clipEnabled = true;
    wx = wy = ww = wh = 0;
    vx = vy = vw = vh = 0;
    painter = p;
    pen = QPen();
    brushOrigin = QPointF(0, 0);
    brush = QBrush();
    font = deviceFont = QFont();
    clipRegion = QRegion();
    clipPath = QPainterPath();
    clipOperation = Qt::NoClip;
    clipInfo.clear();
    worldMatrix.reset();
    matrix.reset();
    layoutDirection = QGuiApplication::layoutDirection();
    composition_mode = QPainter::CompositionMode_SourceOver;
    emulationSpecifier = 0;
    dirtyFlags = { };
    changeFlags = 0;
    renderHints = { };
    opacity = 1;
}
 
QPen QPaintEngineState::pen() const
{
    return static_cast<const QPainterState *>(this)->pen;
}
 
QBrush QPaintEngineState::brush() const
{
    return static_cast<const QPainterState *>(this)->brush;
}
 
QPointF QPaintEngineState::brushOrigin() const
{
    return static_cast<const QPainterState *>(this)->brushOrigin;
}
 
QBrush QPaintEngineState::backgroundBrush() const
{
    return static_cast<const QPainterState *>(this)->bgBrush;
}
 
Qt::BGMode QPaintEngineState::backgroundMode() const
{
    return static_cast<const QPainterState *>(this)->bgMode;
}
 
QFont QPaintEngineState::font() const
{
    return static_cast<const QPainterState *>(this)->font;
}
 
QTransform QPaintEngineState::transform() const
{
    const QPainterState *st = static_cast<const QPainterState *>(this);
 
    return st->matrix;
}
 
 
Qt::ClipOperation QPaintEngineState::clipOperation() const
{
    return static_cast<const QPainterState *>(this)->clipOperation;
}
 
bool QPaintEngineState::brushNeedsResolving() const
{
    const QBrush &brush = static_cast<const QPainterState *>(this)->brush;
    return needsResolving(brush);
}
 
 
bool QPaintEngineState::penNeedsResolving() const
{
    const QPen &pen = static_cast<const QPainterState *>(this)->pen;
    return needsResolving(pen.brush());
}
 
QRegion QPaintEngineState::clipRegion() const
{
    return static_cast<const QPainterState *>(this)->clipRegion;
}
 
QPainterPath QPaintEngineState::clipPath() const
{
    return static_cast<const QPainterState *>(this)->clipPath;
}
 
bool QPaintEngineState::isClipEnabled() const
{
    return static_cast<const QPainterState *>(this)->clipEnabled;
}
 
QPainter::RenderHints QPaintEngineState::renderHints() const
{
    return static_cast<const QPainterState *>(this)->renderHints;
}
 
QPainter::CompositionMode QPaintEngineState::compositionMode() const
{
    return static_cast<const QPainterState *>(this)->composition_mode;
}
 
 
QPainter *QPaintEngineState::painter() const
{
    return static_cast<const QPainterState *>(this)->painter;
}
 
 
qreal QPaintEngineState::opacity() const
{
    return static_cast<const QPainterState *>(this)->opacity;
}
 
void QPainter::setTransform(const QTransform &transform, bool combine )
{
    setWorldTransform(transform, combine);
}
 
const QTransform & QPainter::transform() const
{
    return worldTransform();
}
 
 
const QTransform & QPainter::deviceTransform() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::deviceTransform: Painter not active");
        return d->fakeState()->transform;
    }
    return d->state->matrix;
}
 
 
void QPainter::resetTransform()
{
     Q_D(QPainter);
#ifdef QT_DEBUG_DRAW
    if (qt_show_painter_debug_output)
        printf("QPainter::resetMatrix()\n");
#endif
    if (!d->engine) {
        qWarning("QPainter::resetMatrix: Painter not active");
        return;
    }
 
    d->state->wx = d->state->wy = d->state->vx = d->state->vy = 0;                        // default view origins
    d->state->ww = d->state->vw = d->device->metric(QPaintDevice::PdmWidth);
    d->state->wh = d->state->vh = d->device->metric(QPaintDevice::PdmHeight);
    d->state->worldMatrix = QTransform();
    setWorldMatrixEnabled(false);
    setViewTransformEnabled(false);
    if (d->extended)
        d->extended->transformChanged();
    else
        d->state->dirtyFlags |= QPaintEngine::DirtyTransform;
}
 
void QPainter::setWorldTransform(const QTransform &matrix, bool combine )
{
    Q_D(QPainter);
 
    if (!d->engine) {
        qWarning("QPainter::setWorldTransform: Painter not active");
        return;
    }
 
    if (combine)
        d->state->worldMatrix = matrix * d->state->worldMatrix;                        // combines
    else
        d->state->worldMatrix = matrix;                                // set new matrix
 
    d->state->WxF = true;
    d->updateMatrix();
}
 
const QTransform & QPainter::worldTransform() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::worldTransform: Painter not active");
        return d->fakeState()->transform;
    }
    return d->state->worldMatrix;
}
 
QTransform QPainter::combinedTransform() const
{
    Q_D(const QPainter);
    if (!d->engine) {
        qWarning("QPainter::combinedTransform: Painter not active");
        return QTransform();
    }
    return d->state->worldMatrix * d->viewTransform() * d->hidpiScaleTransform();
}
 
void QPainter::drawPixmapFragments(const PixmapFragment *fragments, int fragmentCount,
                                   const QPixmap &pixmap, PixmapFragmentHints hints)
{
    Q_D(QPainter);
 
    if (!d->engine || pixmap.isNull())
        return;
 
#ifndef QT_NO_DEBUG
    for (int i = 0; i < fragmentCount; ++i) {
        QRectF sourceRect(fragments[i].sourceLeft, fragments[i].sourceTop,
                          fragments[i].width, fragments[i].height);
        if (!(QRectF(pixmap.rect()).contains(sourceRect)))
            qWarning("QPainter::drawPixmapFragments - the source rect is not contained by the pixmap's rectangle");
    }
#endif
 
    if (d->engine->isExtended()) {
        d->extended->drawPixmapFragments(fragments, fragmentCount, pixmap, hints);
    } else {
        qreal oldOpacity = opacity();
        QTransform oldTransform = transform();
 
        for (int i = 0; i < fragmentCount; ++i) {
            QTransform transform = oldTransform;
            qreal xOffset = 0;
            qreal yOffset = 0;
            if (fragments[i].rotation == 0) {
                xOffset = fragments[i].x;
                yOffset = fragments[i].y;
            } else {
                transform.translate(fragments[i].x, fragments[i].y);
                transform.rotate(fragments[i].rotation);
            }
            setOpacity(oldOpacity * fragments[i].opacity);
            setTransform(transform);
 
            qreal w = fragments[i].scaleX * fragments[i].width;
            qreal h = fragments[i].scaleY * fragments[i].height;
            QRectF sourceRect(fragments[i].sourceLeft, fragments[i].sourceTop,
                              fragments[i].width, fragments[i].height);
            drawPixmap(QRectF(-0.5 * w + xOffset, -0.5 * h + yOffset, w, h), pixmap, sourceRect);
        }
 
        setOpacity(oldOpacity);
        setTransform(oldTransform);
    }
}
 
QPainter::PixmapFragment QPainter::PixmapFragment::create(const QPointF &pos, const QRectF &sourceRect,
                                              qreal scaleX, qreal scaleY, qreal rotation,
                                              qreal opacity)
{
    PixmapFragment fragment = {pos.x(), pos.y(), sourceRect.x(), sourceRect.y(), sourceRect.width(),
                               sourceRect.height(), scaleX, scaleY, rotation, opacity};
    return fragment;
}
 
void qt_draw_helper(QPainterPrivate *p, const QPainterPath &path, QPainterPrivate::DrawOperation operation)
{
    p->draw_helper(path, operation);
}
 
QT_END_NAMESPACE
 
#include "moc_qpainter.cpp"