/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qpaintengine_mac_p.h"
#include "qprintengine_mac_p.h"

#include <qbitmap.h>
#include <qpaintdevice.h>
#include <qpainterpath.h>
#include <qpixmapcache.h>
#include <private/qpaintengine_raster_p.h>
#include <qprinter.h>
#include <qstack.h>
#include <qtextcodec.h>
#include <qwidget.h>
#include <qvarlengtharray.h>
#include <qdebug.h>
#include <qcoreapplication.h>
#include <qmath.h>

#include <qpa/qplatformpixmap.h>

#include <private/qfont_p.h>
#include <private/qfontengine_p.h>
#include <private/qfontengine_coretext_p.h>
#include <private/qnumeric_p.h>
#include <private/qpainter_p.h>
#include <private/qpainterpath_p.h>
#include <private/qtextengine_p.h>

#include "qcocoahelpers.h"

#include <string.h>

QT_BEGIN_NAMESPACE

/*****************************************************************************
  QCoreGraphicsPaintEngine utility functions
 *****************************************************************************/

void qt_mac_clip_cg(CGContextRef hd, const QRegion &rgn, CGAffineTransform *orig_xform)
{
    CGAffineTransform old_xform = CGAffineTransformIdentity;
    if (orig_xform) { //setup xforms
        old_xform = CGContextGetCTM(hd);
        CGContextConcatCTM(hd, CGAffineTransformInvert(old_xform));
        CGContextConcatCTM(hd, *orig_xform);
    }

    //do the clipping
    CGContextBeginPath(hd);
    if (rgn.isEmpty()) {
        CGContextAddRect(hd, CGRectMake(0, 0, 0, 0));
    } else {
#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
        if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5) {
            QCFType<HIMutableShapeRef> shape = qt_mac_QRegionToHIMutableShape(rgn);
            Q_ASSERT(!HIShapeIsEmpty(shape));
            HIShapeReplacePathInCGContext(shape, hd);
        } else
#endif
        {
            QVector<QRect> rects = rgn.rects();
            const int count = rects.size();
            for (int i = 0; i < count; i++) {
                const QRect &r = rects[i];
                CGRect mac_r = CGRectMake(r.x(), r.y(), r.width(), r.height());
                CGContextAddRect(hd, mac_r);
            }
        }

    }
    CGContextClip(hd);

    if (orig_xform) {//reset xforms
        CGContextConcatCTM(hd, CGAffineTransformInvert(CGContextGetCTM(hd)));
        CGContextConcatCTM(hd, old_xform);
    }
}

CGColorSpaceRef qt_mac_colorSpaceForDeviceType(const QPaintDevice *paintDevice)
{
    bool isWidget = (paintDevice->devType() == QInternal::Widget);
    return QCoreGraphicsPaintEngine::macDisplayColorSpace(isWidget ? static_cast<const QWidget *>(paintDevice)
                                                                   : 0);
}

// Implemented for qt_mac_p.h
QMacCGContext::QMacCGContext(QPainter *p)
{
    QPaintEngine *pe = p->paintEngine();
    if (pe->type() == QPaintEngine::MacPrinter)
        pe = static_cast<QMacPrintEngine*>(pe)->paintEngine();
    pe->syncState();
    context = 0;
    if (pe->type() == QPaintEngine::CoreGraphics)
        context = static_cast<QCoreGraphicsPaintEngine*>(pe)->handle();

    int devType = p->device()->devType();
    if (pe->type() == QPaintEngine::Raster
            && (devType == QInternal::Widget || devType == QInternal::Pixmap || devType == QInternal::Image)) {

        CGColorSpaceRef colorspace = qt_mac_colorSpaceForDeviceType(pe->paintDevice());
        uint flags = kCGImageAlphaPremultipliedFirst;
#ifdef kCGBitmapByteOrder32Host //only needed because CGImage.h added symbols in the minor version
        flags |= kCGBitmapByteOrder32Host;
#endif
        const QImage *image = (const QImage *) pe->paintDevice();

        context = CGBitmapContextCreate((void *) image->bits(), image->width(), image->height(),
                                        8, image->bytesPerLine(), colorspace, flags);

        CGContextTranslateCTM(context, 0, image->height());
        CGContextScaleCTM(context, 1, -1);

        if (devType == QInternal::Widget) {
            QRegion clip = p->paintEngine()->systemClip();
            QTransform native = p->deviceTransform();
            QTransform logical = p->combinedTransform();

            if (p->hasClipping()) {
                QRegion r = p->clipRegion();
                r.translate(native.dx(), native.dy());
                if (clip.isEmpty())
                    clip = r;
                else
                    clip &= r;
            }
            qt_mac_clip_cg(context, clip, 0);

            CGContextTranslateCTM(context, native.dx(), native.dy());
        }
    } else {
        CGContextRetain(context);
    }
}

void qt_mac_cgimage_data_free(void *, const void *memoryToFree, size_t)
{
    free(const_cast<void *>(memoryToFree));
}

CGImageRef qt_mac_create_imagemask(const QPixmap &pixmap, const QRectF &sr)
{
    QImage image = pixmap.toImage();
    if (image.format() != QImage::Format_ARGB32_Premultiplied)
        image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);

    const int sx = qRound(sr.x()), sy = qRound(sr.y()), sw = qRound(sr.width()), sh = qRound(sr.height());
    const int sbpr = image.bytesPerLine();
    const uint nbytes = sw * sh;
    //  alpha is always 255 for bitmaps, ignore it in this case.
    const quint32 mask = pixmap.depth() == 1 ? 0x00ffffff : 0xffffffff;
    quint8 *dptr = static_cast<quint8 *>(malloc(nbytes));
    quint32 *sptr = reinterpret_cast<quint32 *>(image.scanLine(0)), *srow;
    for (int y = sy, offset=0; y < sh; ++y) {
        srow = sptr + (y * (sbpr / 4));
        for (int x = sx; x < sw; ++x)
            *(dptr+(offset++)) = (*(srow+x) & mask) ? 255 : 0;
    }
    QCFType<CGDataProviderRef> provider = CGDataProviderCreateWithData(0, dptr, nbytes, qt_mac_cgimage_data_free);
    return CGImageMaskCreate(sw, sh, 8, 8, nbytes / sh, provider, 0, 0);
}

//conversion
inline static float qt_mac_convert_color_to_cg(int c) { return ((float)c * 1000 / 255) / 1000; }
inline static int qt_mac_convert_color_from_cg(float c) { return qRound(c * 255); }
CGAffineTransform qt_mac_convert_transform_to_cg(const QTransform &t) {
    return CGAffineTransformMake(t.m11(), t.m12(), t.m21(), t.m22(), t.dx(),  t.dy());
}

/*! \internal

    Returns the CoreGraphics CGContextRef of the paint device. 0 is
    returned if it can't be obtained. It is the caller's responsibility to
    CGContextRelease the context when finished using it.

    \warning This function is only available on Mac OS X.
    \warning This function is duplicated in qmacstyle_mac.mm
*/
CGContextRef qt_mac_cg_context(const QPaintDevice *pdev)
{
    if (pdev->devType() == QInternal::Pixmap) {
        const QPixmap *pm = static_cast<const QPixmap*>(pdev);
        CGColorSpaceRef colorspace = qt_mac_colorSpaceForDeviceType(pdev);
        uint flags = kCGImageAlphaPremultipliedFirst;
        flags |= kCGBitmapByteOrder32Host;
        CGContextRef ret = 0;

        QPlatformPixmap *data = const_cast<QPixmap *>(pm)->data_ptr().data();
        if (data && data->classId() == QPlatformPixmap::RasterClass) {
            QImage *image = data->buffer();
            ret = CGBitmapContextCreate(image->bits(), image->width(), image->height(),
                                        8, image->bytesPerLine(), colorspace, flags);
        } else {
            qDebug() << "qt_mac_cg_context: Unsupported pixmap class";
        }

        CGContextTranslateCTM(ret, 0, pm->height());
        CGContextScaleCTM(ret, 1, -1);
        return ret;
    } else if (pdev->devType() == QInternal::Widget) {
        //CGContextRef ret = static_cast<CGContextRef>(static_cast<const QWidget *>(pdev)->macCGHandle());
        ///CGContextRetain(ret);
        //return ret;
        qDebug() << "qt_mac_cg_context: not implemented: Widget class";
        return 0;
    }
    return 0;
}

inline static QCFType<CGColorRef> cgColorForQColor(const QColor &col, QPaintDevice *pdev)
{
    CGFloat components[] = {
        qt_mac_convert_color_to_cg(col.red()),
        qt_mac_convert_color_to_cg(col.green()),
        qt_mac_convert_color_to_cg(col.blue()),
        qt_mac_convert_color_to_cg(col.alpha())
    };
    return CGColorCreate(qt_mac_colorSpaceForDeviceType(pdev), components);
}

// There's architectural problems with using native gradients
// on the Mac at the moment, so disable them.
// #define QT_MAC_USE_NATIVE_GRADIENTS

#ifdef QT_MAC_USE_NATIVE_GRADIENTS
static bool drawGradientNatively(const QGradient *gradient)
{
    return gradient->spread() == QGradient::PadSpread;
}

// gradiant callback
static void qt_mac_color_gradient_function(void *info, const CGFloat *in, CGFloat *out)
{
    QBrush *brush = static_cast<QBrush *>(info);
    Q_ASSERT(brush && brush->gradient());

    const QGradientStops stops = brush->gradient()->stops();
    const int n = stops.count();
    Q_ASSERT(n >= 1);
    const QGradientStop *begin = stops.constBegin();
    const QGradientStop *end = begin + n;

    qreal p = in[0];
    const QGradientStop *i = begin;
    while (i != end && i->first < p)
        ++i;

    QRgb c;
    if (i == begin) {
        c = begin->second.rgba();
    } else if (i == end) {
        c = (end - 1)->second.rgba();
    } else {
        const QGradientStop &s1 = *(i - 1);
        const QGradientStop &s2 = *i;
        qreal p1 = s1.first;
        qreal p2 = s2.first;
        QRgb c1 = s1.second.rgba();
        QRgb c2 = s2.second.rgba();
        int idist = 256 * (p - p1) / (p2 - p1);
        int dist = 256 - idist;
        c = qRgba(INTERPOLATE_PIXEL_256(qRed(c1), dist, qRed(c2), idist),
                  INTERPOLATE_PIXEL_256(qGreen(c1), dist, qGreen(c2), idist),
                  INTERPOLATE_PIXEL_256(qBlue(c1), dist, qBlue(c2), idist),
                  INTERPOLATE_PIXEL_256(qAlpha(c1), dist, qAlpha(c2), idist));
    }

    out[0] = qt_mac_convert_color_to_cg(qRed(c));
    out[1] = qt_mac_convert_color_to_cg(qGreen(c));
    out[2] = qt_mac_convert_color_to_cg(qBlue(c));
    out[3] = qt_mac_convert_color_to_cg(qAlpha(c));
}
#endif

//clipping handling
void QCoreGraphicsPaintEnginePrivate::resetClip()
{
    static bool inReset = false;
    if (inReset)
        return;
    inReset = true;

    CGAffineTransform old_xform = CGContextGetCTM(hd);

    //setup xforms
    CGContextConcatCTM(hd, CGAffineTransformInvert(old_xform));
    while (stackCount > 0) {
        restoreGraphicsState();
    }
    saveGraphicsState();
    inReset = false;
    //reset xforms
    CGContextConcatCTM(hd, CGAffineTransformInvert(CGContextGetCTM(hd)));
    CGContextConcatCTM(hd, old_xform);
}

static CGRect qt_mac_compose_rect(const QRectF &r, float off=0)
{
    return CGRectMake(r.x()+off, r.y()+off, r.width(), r.height());
}

static CGMutablePathRef qt_mac_compose_path(const QPainterPath &p, float off=0)
{
    CGMutablePathRef ret = CGPathCreateMutable();
    QPointF startPt;
    for (int i=0; i<p.elementCount(); ++i) {
        const QPainterPath::Element &elm = p.elementAt(i);
        switch (elm.type) {
            case QPainterPath::MoveToElement:
                if (i > 0
                        && p.elementAt(i - 1).x == startPt.x()
                        && p.elementAt(i - 1).y == startPt.y())
                    CGPathCloseSubpath(ret);
                startPt = QPointF(elm.x, elm.y);
                CGPathMoveToPoint(ret, 0, elm.x+off, elm.y+off);
                break;
            case QPainterPath::LineToElement:
                CGPathAddLineToPoint(ret, 0, elm.x+off, elm.y+off);
                break;
            case QPainterPath::CurveToElement:
                Q_ASSERT(p.elementAt(i+1).type == QPainterPath::CurveToDataElement);
                Q_ASSERT(p.elementAt(i+2).type == QPainterPath::CurveToDataElement);
                CGPathAddCurveToPoint(ret, 0,
                        elm.x+off, elm.y+off,
                        p.elementAt(i+1).x+off, p.elementAt(i+1).y+off,
                        p.elementAt(i+2).x+off, p.elementAt(i+2).y+off);
                i+=2;
                break;
            default:
                qFatal("QCoreGraphicsPaintEngine::drawPath(), unhandled type: %d", elm.type);
                break;
        }
    }
    if (!p.isEmpty()
            && p.elementAt(p.elementCount() - 1).x == startPt.x()
            && p.elementAt(p.elementCount() - 1).y == startPt.y())
        CGPathCloseSubpath(ret);
    return ret;
}

CGColorSpaceRef QCoreGraphicsPaintEngine::m_genericColorSpace = 0;
QHash<CGDirectDisplayID, CGColorSpaceRef> QCoreGraphicsPaintEngine::m_displayColorSpaceHash;
bool QCoreGraphicsPaintEngine::m_postRoutineRegistered = false;

CGColorSpaceRef QCoreGraphicsPaintEngine::macGenericColorSpace()
{
#if 0
    if (!m_genericColorSpace) {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
        if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_4) {
            m_genericColorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
        } else
#endif
        {
            m_genericColorSpace = CGColorSpaceCreateDeviceRGB();
        }
        if (!m_postRoutineRegistered) {
            m_postRoutineRegistered = true;
            qAddPostRoutine(QCoreGraphicsPaintEngine::cleanUpMacColorSpaces);
        }
    }
    return m_genericColorSpace;
#else
    // Just return the main display colorspace for the moment.
    return macDisplayColorSpace();
#endif
}

/*
    Ideally, we should pass the widget in here, and use CGGetDisplaysWithRect() etc.
    to support multiple displays correctly.
*/
CGColorSpaceRef QCoreGraphicsPaintEngine::macDisplayColorSpace(const QWidget *widget)
{
    CGColorSpaceRef colorSpace;

    CGDirectDisplayID displayID;
    CMProfileRef displayProfile = 0;
    if (widget == 0) {
        displayID = CGMainDisplayID();
    } else {
        const QRect &qrect = widget->window()->geometry();
        CGRect rect = CGRectMake(qrect.x(), qrect.y(), qrect.width(), qrect.height());
        CGDisplayCount throwAway;
        CGDisplayErr dErr = CGGetDisplaysWithRect(rect, 1, &displayID, &throwAway);
        if (dErr != kCGErrorSuccess)
            return macDisplayColorSpace(0); // fall back on main display
    }
    if ((colorSpace = m_displayColorSpaceHash.value(displayID)))
        return colorSpace;

    CMError err = CMGetProfileByAVID((CMDisplayIDType)displayID, &displayProfile);
    if (err == noErr) {
        colorSpace = CGColorSpaceCreateWithPlatformColorSpace(displayProfile);
    } else if (widget) {
        return macDisplayColorSpace(0); // fall back on main display
    }

    if (colorSpace == 0)
        colorSpace = CGColorSpaceCreateDeviceRGB();

    m_displayColorSpaceHash.insert(displayID, colorSpace);
    CMCloseProfile(displayProfile);
    if (!m_postRoutineRegistered) {
        m_postRoutineRegistered = true;
        qAddPostRoutine(QCoreGraphicsPaintEngine::cleanUpMacColorSpaces);
    }
    return colorSpace;
}

void QCoreGraphicsPaintEngine::cleanUpMacColorSpaces()
{
    if (m_genericColorSpace) {
        CFRelease(m_genericColorSpace);
        m_genericColorSpace = 0;
    }
    QHash<CGDirectDisplayID, CGColorSpaceRef>::const_iterator it = m_displayColorSpaceHash.constBegin();
    while (it != m_displayColorSpaceHash.constEnd()) {
        if (it.value())
            CFRelease(it.value());
        ++it;
    }
    m_displayColorSpaceHash.clear();
}

//pattern handling (tiling)
#if 1
#  define QMACPATTERN_MASK_MULTIPLIER 32
#else
#  define QMACPATTERN_MASK_MULTIPLIER 1
#endif
class QMacPattern
{
public:
    QMacPattern() : as_mask(false), pdev(0), image(0) { data.bytes = 0; }
    ~QMacPattern() { CGImageRelease(image); }
    int width() {
        if (image)
            return CGImageGetWidth(image);
        if (data.bytes)
            return 8*QMACPATTERN_MASK_MULTIPLIER;
        return data.pixmap.width();
    }
    int height() {
        if (image)
            return CGImageGetHeight(image);
        if (data.bytes)
            return 8*QMACPATTERN_MASK_MULTIPLIER;
        return data.pixmap.height();
    }

    //input
    QColor foreground;
    bool as_mask;
    struct {
        QPixmap pixmap;
        const uchar *bytes;
    } data;
    QPaintDevice *pdev;
    //output
    CGImageRef image;
};
static void qt_mac_draw_pattern(void *info, CGContextRef c)
{
    QMacPattern *pat = (QMacPattern*)info;
    int w = 0, h = 0;
    bool isBitmap = (pat->data.pixmap.depth() == 1);
    if (!pat->image) { //lazy cache
        if (pat->as_mask) {
            Q_ASSERT(pat->data.bytes);
            w = h = 8;
#if (QMACPATTERN_MASK_MULTIPLIER == 1)
            CGDataProviderRef provider = CGDataProviderCreateWithData(0, pat->data.bytes, w*h, 0);
            pat->image = CGImageMaskCreate(w, h, 1, 1, 1, provider, 0, false);
            CGDataProviderRelease(provider);
#else
            const int numBytes = (w*h)/sizeof(uchar);
            uchar xor_bytes[numBytes];
            for (int i = 0; i < numBytes; ++i)
                xor_bytes[i] = pat->data.bytes[i] ^ 0xFF;
            CGDataProviderRef provider = CGDataProviderCreateWithData(0, xor_bytes, w*h, 0);
            CGImageRef swatch = CGImageMaskCreate(w, h, 1, 1, 1, provider, 0, false);
            CGDataProviderRelease(provider);

            const QColor c0(0, 0, 0, 0), c1(255, 255, 255, 255);
            QPixmap pm(w*QMACPATTERN_MASK_MULTIPLIER, h*QMACPATTERN_MASK_MULTIPLIER);
            pm.fill(c0);
            CGContextRef pm_ctx = qt_mac_cg_context(&pm);
            CGContextSetFillColorWithColor(c, cgColorForQColor(c1, pat->pdev));
            CGRect rect = CGRectMake(0, 0, w, h);
            for (int x = 0; x < QMACPATTERN_MASK_MULTIPLIER; ++x) {
                rect.origin.x = x * w;
                for (int y = 0; y < QMACPATTERN_MASK_MULTIPLIER; ++y) {
                    rect.origin.y = y * h;
                    qt_mac_drawCGImage(pm_ctx, &rect, swatch);
                }
            }
            pat->image = qt_mac_create_imagemask(pm, pm.rect());
            CGImageRelease(swatch);
            CGContextRelease(pm_ctx);
            w *= QMACPATTERN_MASK_MULTIPLIER;
            h *= QMACPATTERN_MASK_MULTIPLIER;
#endif
        } else {
            w = pat->data.pixmap.width();
            h = pat->data.pixmap.height();
            if (isBitmap)
                pat->image = qt_mac_create_imagemask(pat->data.pixmap, pat->data.pixmap.rect());
            else
                pat->image = qt_mac_image_to_cgimage(pat->data.pixmap.toImage());
        }
    } else {
        w = CGImageGetWidth(pat->image);
        h = CGImageGetHeight(pat->image);
    }

    //draw
    bool needRestore = false;
    if (CGImageIsMask(pat->image)) {
        CGContextSaveGState(c);
        CGContextSetFillColorWithColor(c, cgColorForQColor(pat->foreground, pat->pdev));
    }
    CGRect rect = CGRectMake(0, 0, w, h);
    qt_mac_drawCGImage(c, &rect, pat->image);
    if (needRestore)
        CGContextRestoreGState(c);
}
static void qt_mac_dispose_pattern(void *info)
{
    QMacPattern *pat = (QMacPattern*)info;
    delete pat;
}

/*****************************************************************************
  QCoreGraphicsPaintEngine member functions
 *****************************************************************************/

inline static QPaintEngine::PaintEngineFeatures qt_mac_cg_features()
{
    return QPaintEngine::PaintEngineFeatures(QPaintEngine::AllFeatures & ~QPaintEngine::PaintOutsidePaintEvent
                                              & ~QPaintEngine::PerspectiveTransform
                                              & ~QPaintEngine::ConicalGradientFill
                                              & ~QPaintEngine::LinearGradientFill
                                              & ~QPaintEngine::RadialGradientFill
                                              & ~QPaintEngine::BrushStroke);
}

QCoreGraphicsPaintEngine::QCoreGraphicsPaintEngine()
: QPaintEngine(*(new QCoreGraphicsPaintEnginePrivate), qt_mac_cg_features())
{
}

QCoreGraphicsPaintEngine::QCoreGraphicsPaintEngine(QPaintEnginePrivate &dptr)
: QPaintEngine(dptr, qt_mac_cg_features())
{
}

QCoreGraphicsPaintEngine::~QCoreGraphicsPaintEngine()
{
}

bool
QCoreGraphicsPaintEngine::begin(QPaintDevice *pdev)
{
    Q_D(QCoreGraphicsPaintEngine);
    if (isActive()) {                         // already active painting
        qWarning("QCoreGraphicsPaintEngine::begin: Painter already active");
        return false;
    }

    //initialization
    d->pdev = pdev;
    d->complexXForm = false;
    d->cosmeticPen = QCoreGraphicsPaintEnginePrivate::CosmeticSetPenWidth;
    d->cosmeticPenSize = 1;
    d->current.clipEnabled = false;
    d->pixelSize = QPoint(1,1);
    d->hd = qt_mac_cg_context(pdev);
    if (d->hd) {
        d->saveGraphicsState();
        d->orig_xform = CGContextGetCTM(d->hd);
        if (d->shading) {
            CGShadingRelease(d->shading);
            d->shading = 0;
        }
        d->setClip(0);  //clear the context's clipping
    }

    setActive(true);

    if (d->pdev->devType() == QInternal::Widget) {                    // device is a widget
        QWidget *w = (QWidget*)d->pdev;
        bool unclipped = w->testAttribute(Qt::WA_PaintUnclipped);

        if ((w->windowType() == Qt::Desktop)) {
            if (!unclipped)
                qWarning("QCoreGraphicsPaintEngine::begin: Does not support clipped desktop on Mac OS X");
            // ## need to do [qt_mac_window_for(w) makeKeyAndOrderFront]; (need to rename the file)
        } else if (unclipped) {
            qWarning("QCoreGraphicsPaintEngine::begin: Does not support unclipped painting");
        }
    } else if (d->pdev->devType() == QInternal::Pixmap) {             // device is a pixmap
        QPixmap *pm = (QPixmap*)d->pdev;
        if (pm->isNull()) {
            qWarning("QCoreGraphicsPaintEngine::begin: Cannot paint null pixmap");
            end();
            return false;
        }
    }

    setDirty(QPaintEngine::DirtyPen);
    setDirty(QPaintEngine::DirtyBrush);
    setDirty(QPaintEngine::DirtyBackground);
    setDirty(QPaintEngine::DirtyHints);
    return true;
}

bool
QCoreGraphicsPaintEngine::end()
{
    Q_D(QCoreGraphicsPaintEngine);
    setActive(false);
    if (d->pdev->devType() == QInternal::Widget && static_cast<QWidget*>(d->pdev)->windowType() == Qt::Desktop) {
        // ### need to do [qt_mac_window_for(static_cast<QWidget *>(d->pdev)) orderOut]; (need to rename)
    }
    if (d->shading) {
        CGShadingRelease(d->shading);
        d->shading = 0;
    }
    d->pdev = 0;
    if (d->hd) {
        d->restoreGraphicsState();
        CGContextSynchronize(d->hd);
        CGContextRelease(d->hd);
        d->hd = 0;
    }
    return true;
}

void
QCoreGraphicsPaintEngine::updateState(const QPaintEngineState &state)
{
    Q_D(QCoreGraphicsPaintEngine);
    QPaintEngine::DirtyFlags flags = state.state();

    if (flags & DirtyTransform)
        updateMatrix(state.transform());

    if (flags & DirtyClipEnabled) {
        if (state.isClipEnabled())
            updateClipPath(painter()->clipPath(), Qt::ReplaceClip);
        else
            updateClipPath(QPainterPath(), Qt::NoClip);
    }

    if (flags & DirtyClipPath) {
        updateClipPath(state.clipPath(), state.clipOperation());
    } else if (flags & DirtyClipRegion) {
        updateClipRegion(state.clipRegion(), state.clipOperation());
    }

    // If the clip has changed we need to update all other states
    // too, since they are included in the system context on OSX,
    // and changing the clip resets that context back to scratch.
    if (flags & (DirtyClipPath | DirtyClipRegion | DirtyClipEnabled))
        flags |= AllDirty;

    if (flags & DirtyPen)
        updatePen(state.pen());
    if (flags & (DirtyBrush|DirtyBrushOrigin))
        updateBrush(state.brush(), state.brushOrigin());
    if (flags & DirtyFont)
        updateFont(state.font());
    if (flags & DirtyOpacity)
        updateOpacity(state.opacity());
    if (flags & DirtyHints)
        updateRenderHints(state.renderHints());
    if (flags & DirtyCompositionMode)
        updateCompositionMode(state.compositionMode());

    if (flags & (DirtyPen | DirtyTransform)) {
        if (!d->current.pen.isCosmetic()) {
            d->cosmeticPen = QCoreGraphicsPaintEnginePrivate::CosmeticNone;
        } else if (d->current.transform.m11() < d->current.transform.m22()-1.0 ||
                  d->current.transform.m11() > d->current.transform.m22()+1.0) {
            d->cosmeticPen = QCoreGraphicsPaintEnginePrivate::CosmeticTransformPath;
            d->cosmeticPenSize = d->adjustPenWidth(d->current.pen.widthF());
            if (!d->cosmeticPenSize)
                d->cosmeticPenSize = 1.0;
        } else {
            d->cosmeticPen = QCoreGraphicsPaintEnginePrivate::CosmeticSetPenWidth;
            static const float sqrt2 = sqrt(2);
            qreal width = d->current.pen.widthF();
            if (!width)
                width = 1;
            d->cosmeticPenSize = sqrt(pow(d->pixelSize.y(), 2) + pow(d->pixelSize.x(), 2)) / sqrt2 * width;
        }
    }
}

void
QCoreGraphicsPaintEngine::updatePen(const QPen &pen)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());
    d->current.pen = pen;
    d->setStrokePen(pen);
}

void
QCoreGraphicsPaintEngine::updateBrush(const QBrush &brush, const QPointF &brushOrigin)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());
    d->current.brush = brush;

#ifdef QT_MAC_USE_NATIVE_GRADIENTS
    // Quartz supports only pad spread
    if (const QGradient *gradient = brush.gradient()) {
        if (drawGradientNatively(gradient)) {
            gccaps |= QPaintEngine::LinearGradientFill | QPaintEngine::RadialGradientFill;
        } else {
            gccaps &= ~(QPaintEngine::LinearGradientFill | QPaintEngine::RadialGradientFill);
        }
    }
#endif

    if (d->shading) {
        CGShadingRelease(d->shading);
        d->shading = 0;
    }
    d->setFillBrush(brushOrigin);
}

void
QCoreGraphicsPaintEngine::updateOpacity(qreal opacity)
{
    Q_D(QCoreGraphicsPaintEngine);
    CGContextSetAlpha(d->hd, opacity);
}

void
QCoreGraphicsPaintEngine::updateFont(const QFont &)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());
    updatePen(d->current.pen);
}

void
QCoreGraphicsPaintEngine::updateMatrix(const QTransform &transform)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (qt_is_nan(transform.m11()) || qt_is_nan(transform.m12()) || qt_is_nan(transform.m13())
        || qt_is_nan(transform.m21()) || qt_is_nan(transform.m22()) || qt_is_nan(transform.m23())
        || qt_is_nan(transform.m31()) || qt_is_nan(transform.m32()) || qt_is_nan(transform.m33()))
        return;

    d->current.transform = transform;
    d->setTransform(transform.isIdentity() ? 0 : &transform);
    d->complexXForm = (transform.m11() != 1 || transform.m22() != 1
            || transform.m12() != 0 || transform.m21() != 0);
    d->pixelSize = d->devicePixelSize(d->hd);
}

void
QCoreGraphicsPaintEngine::updateClipPath(const QPainterPath &p, Qt::ClipOperation op)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());
    if (op == Qt::NoClip) {
        if (d->current.clipEnabled) {
            d->current.clipEnabled = false;
            d->current.clip = QRegion();
            d->setClip(0);
        }
    } else {
        if (!d->current.clipEnabled)
            op = Qt::ReplaceClip;
        d->current.clipEnabled = true;
        QRegion clipRegion(p.toFillPolygon().toPolygon(), p.fillRule());
        if (op == Qt::ReplaceClip) {
            d->current.clip = clipRegion;
            d->setClip(0);
            if (p.isEmpty()) {
                CGRect rect = CGRectMake(0, 0, 0, 0);
                CGContextClipToRect(d->hd, rect);
            } else {
                CGMutablePathRef path = qt_mac_compose_path(p);
                CGContextBeginPath(d->hd);
                CGContextAddPath(d->hd, path);
                if (p.fillRule() == Qt::WindingFill)
                    CGContextClip(d->hd);
                else
                    CGContextEOClip(d->hd);
                CGPathRelease(path);
            }
        } else if (op == Qt::IntersectClip) {
            d->current.clip = d->current.clip.intersected(clipRegion);
            d->setClip(&d->current.clip);
        }
    }
}

void
QCoreGraphicsPaintEngine::updateClipRegion(const QRegion &clipRegion, Qt::ClipOperation op)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());
    if (op == Qt::NoClip) {
        d->current.clipEnabled = false;
        d->current.clip = QRegion();
        d->setClip(0);
    } else {
        if (!d->current.clipEnabled)
            op = Qt::ReplaceClip;
        d->current.clipEnabled = true;
        if (op == Qt::IntersectClip)
            d->current.clip = d->current.clip.intersected(clipRegion);
        else if (op == Qt::ReplaceClip)
            d->current.clip = clipRegion;
        d->setClip(&d->current.clip);
    }
}

void
QCoreGraphicsPaintEngine::drawPath(const QPainterPath &p)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    CGMutablePathRef path = qt_mac_compose_path(p);
    uchar ops = QCoreGraphicsPaintEnginePrivate::CGStroke;
    if (p.fillRule() == Qt::WindingFill)
        ops |= QCoreGraphicsPaintEnginePrivate::CGFill;
    else
        ops |= QCoreGraphicsPaintEnginePrivate::CGEOFill;
    CGContextBeginPath(d->hd);
    d->drawPath(ops, path);
    CGPathRelease(path);
}

void
QCoreGraphicsPaintEngine::drawRects(const QRectF *rects, int rectCount)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    for (int i=0; i<rectCount; ++i) {
        QRectF r = rects[i];

        CGMutablePathRef path = CGPathCreateMutable();
        CGPathAddRect(path, 0, qt_mac_compose_rect(r));
        d->drawPath(QCoreGraphicsPaintEnginePrivate::CGFill|QCoreGraphicsPaintEnginePrivate::CGStroke,
                path);
        CGPathRelease(path);
    }
}

void
QCoreGraphicsPaintEngine::drawPoints(const QPointF *points, int pointCount)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    if (d->current.pen.capStyle() == Qt::FlatCap)
        CGContextSetLineCap(d->hd, kCGLineCapSquare);

    CGMutablePathRef path = CGPathCreateMutable();
    for (int i=0; i < pointCount; i++) {
        float x = points[i].x(), y = points[i].y();
        CGPathMoveToPoint(path, 0, x, y);
        CGPathAddLineToPoint(path, 0, x+0.001, y);
    }

    bool doRestore = false;
    if (d->cosmeticPen == QCoreGraphicsPaintEnginePrivate::CosmeticNone && !(state->renderHints() & QPainter::Antialiasing)) {
        //we don't want adjusted pens for point rendering
        doRestore = true;
        d->saveGraphicsState();
        CGContextSetLineWidth(d->hd, d->current.pen.widthF());
    }
    d->drawPath(QCoreGraphicsPaintEnginePrivate::CGStroke, path);
    if (doRestore)
        d->restoreGraphicsState();
    CGPathRelease(path);
    if (d->current.pen.capStyle() == Qt::FlatCap)
        CGContextSetLineCap(d->hd, kCGLineCapButt);
}

void
QCoreGraphicsPaintEngine::drawEllipse(const QRectF &r)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    CGMutablePathRef path = CGPathCreateMutable();
    CGAffineTransform transform = CGAffineTransformMakeScale(r.width() / r.height(), 1);
    CGPathAddArc(path, &transform,(r.x() + (r.width() / 2)) / (r.width() / r.height()),
            r.y() + (r.height() / 2), r.height() / 2, 0, (2 * M_PI), false);
    d->drawPath(QCoreGraphicsPaintEnginePrivate::CGFill | QCoreGraphicsPaintEnginePrivate::CGStroke,
            path);
    CGPathRelease(path);
}

void
QCoreGraphicsPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, 0, points[0].x(), points[0].y());
    for (int x = 1; x < pointCount; ++x)
        CGPathAddLineToPoint(path, 0, points[x].x(), points[x].y());
    if (mode != PolylineMode && points[0] != points[pointCount-1])
        CGPathAddLineToPoint(path, 0, points[0].x(), points[0].y());
    uint op = QCoreGraphicsPaintEnginePrivate::CGStroke;
    if (mode != PolylineMode)
        op |= mode == OddEvenMode ? QCoreGraphicsPaintEnginePrivate::CGEOFill
            : QCoreGraphicsPaintEnginePrivate::CGFill;
    d->drawPath(op, path);
    CGPathRelease(path);
}

void
QCoreGraphicsPaintEngine::drawLines(const QLineF *lines, int lineCount)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    CGMutablePathRef path = CGPathCreateMutable();
    for (int i = 0; i < lineCount; i++) {
        const QPointF start = lines[i].p1(), end = lines[i].p2();
        CGPathMoveToPoint(path, 0, start.x(), start.y());
        CGPathAddLineToPoint(path, 0, end.x(), end.y());
    }
    d->drawPath(QCoreGraphicsPaintEnginePrivate::CGStroke, path);
    CGPathRelease(path);
}

void QCoreGraphicsPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    if (pm.isNull())
        return;

    bool differentSize = (QRectF(0, 0, pm.width(), pm.height()) != sr), doRestore = false;
    CGRect rect = CGRectMake(r.x(), r.y(), r.width(), r.height());
    QCFType<CGImageRef> image;
    bool isBitmap = (pm.depth() == 1);
    if (isBitmap) {
        doRestore = true;
        d->saveGraphicsState();

        const QColor &col = d->current.pen.color();
        CGContextSetFillColorWithColor(d->hd, cgColorForQColor(col, d->pdev));
        image = qt_mac_create_imagemask(pm, sr);
    } else if (differentSize) {
        QCFType<CGImageRef> img = qt_mac_image_to_cgimage(pm.toImage());
        image = CGImageCreateWithImageInRect(img, CGRectMake(qRound(sr.x()), qRound(sr.y()), qRound(sr.width()), qRound(sr.height())));
    } else {
        image = qt_mac_image_to_cgimage(pm.toImage());
    }
    qt_mac_drawCGImage(d->hd, &rect, image);
    if (doRestore)
        d->restoreGraphicsState();
}

static void drawImageReleaseData (void *info, const void *, size_t)
{
    delete static_cast<QImage *>(info);
}

CGImageRef qt_mac_createCGImageFromQImage(const QImage &img, const QImage **imagePtr = 0)
{
    QImage *image;
    if (img.depth() != 32)
        image = new QImage(img.convertToFormat(QImage::Format_ARGB32_Premultiplied));
    else
        image = new QImage(img);

    uint cgflags = kCGImageAlphaNone;
    switch (image->format()) {
    case QImage::Format_ARGB32_Premultiplied:
        cgflags = kCGImageAlphaPremultipliedFirst;
        break;
    case QImage::Format_ARGB32:
        cgflags = kCGImageAlphaFirst;
        break;
    case QImage::Format_RGB32:
        cgflags = kCGImageAlphaNoneSkipFirst;
    default:
        break;
    }
#if defined(kCGBitmapByteOrder32Host) //only needed because CGImage.h added symbols in the minor version
    cgflags |= kCGBitmapByteOrder32Host;
#endif
    QCFType<CGDataProviderRef> dataProvider = CGDataProviderCreateWithData(image,
                                                          static_cast<const QImage *>(image)->bits(),
                                                          image->byteCount(),
                                                          drawImageReleaseData);
    if (imagePtr)
        *imagePtr = image;
    return CGImageCreate(image->width(), image->height(), 8, 32,
                                        image->bytesPerLine(),
                                        QCoreGraphicsPaintEngine::macGenericColorSpace(),
                                        cgflags, dataProvider, 0, false, kCGRenderingIntentDefault);

}

void QCoreGraphicsPaintEngine::drawImage(const QRectF &r, const QImage &img, const QRectF &sr,
                                         Qt::ImageConversionFlags flags)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_UNUSED(flags);
    Q_ASSERT(isActive());

    if (img.isNull() || state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    const QImage *image;
    QCFType<CGImageRef> cgimage = qt_mac_createCGImageFromQImage(img, &image);
    CGRect rect = CGRectMake(r.x(), r.y(), r.width(), r.height());
    if (QRectF(0, 0, img.width(), img.height()) != sr)
        cgimage = CGImageCreateWithImageInRect(cgimage, CGRectMake(sr.x(), sr.y(),
                                               sr.width(), sr.height()));
    qt_mac_drawCGImage(d->hd, &rect, cgimage);
}

void QCoreGraphicsPaintEngine::initialize()
{
}

void QCoreGraphicsPaintEngine::cleanup()
{
}

CGContextRef
QCoreGraphicsPaintEngine::handle() const
{
    return d_func()->hd;
}

void
QCoreGraphicsPaintEngine::drawTiledPixmap(const QRectF &r, const QPixmap &pixmap,
        const QPointF &p)
{
    Q_D(QCoreGraphicsPaintEngine);
    Q_ASSERT(isActive());

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    //save the old state
    d->saveGraphicsState();

    //setup the pattern
    QMacPattern *qpattern = new QMacPattern;
    qpattern->data.pixmap = pixmap;
    qpattern->foreground = d->current.pen.color();
    qpattern->pdev = d->pdev;
    CGPatternCallbacks callbks;
    callbks.version = 0;
    callbks.drawPattern = qt_mac_draw_pattern;
    callbks.releaseInfo = qt_mac_dispose_pattern;
    const int width = qpattern->width(), height = qpattern->height();
    CGAffineTransform trans = CGContextGetCTM(d->hd);
    CGPatternRef pat = CGPatternCreate(qpattern, CGRectMake(0, 0, width, height),
            trans, width, height,
            kCGPatternTilingNoDistortion, true, &callbks);
    CGColorSpaceRef cs = CGColorSpaceCreatePattern(0);
    CGContextSetFillColorSpace(d->hd, cs);
    CGFloat component = 1.0; //just one
    CGContextSetFillPattern(d->hd, pat, &component);
    CGSize phase = CGSizeApplyAffineTransform(CGSizeMake(-(p.x()-r.x()), -(p.y()-r.y())), trans);
    CGContextSetPatternPhase(d->hd, phase);

    //fill the rectangle
    CGRect mac_rect = CGRectMake(r.x(), r.y(), r.width(), r.height());
    CGContextFillRect(d->hd, mac_rect);

    //restore the state
    d->restoreGraphicsState();
    //cleanup
    CGColorSpaceRelease(cs);
    CGPatternRelease(pat);
}

void QCoreGraphicsPaintEngine::drawTextItem(const QPointF &pos, const QTextItem &item)
{
    Q_D(QCoreGraphicsPaintEngine);
    if (d->current.transform.type() == QTransform::TxProject
#ifndef QMAC_NATIVE_GRADIENTS
        || painter()->pen().brush().gradient()  //Just let the base engine "emulate" the gradient
#endif
        ) {
        QPaintEngine::drawTextItem(pos, item);
        return;
    }

    if (state->compositionMode() == QPainter::CompositionMode_Destination)
        return;

    const QTextItemInt &ti = static_cast<const QTextItemInt &>(item);

    QPen oldPen = painter()->pen();
    QBrush oldBrush = painter()->brush();
    QPointF oldBrushOrigin = painter()->brushOrigin();
    updatePen(Qt::NoPen);
    updateBrush(oldPen.brush(), QPointF(0, 0));

    Q_ASSERT(type() == QPaintEngine::CoreGraphics);

    QFontEngine *fe = ti.fontEngine;

    const bool textAA = ((state->renderHints() & QPainter::TextAntialiasing)
                         && (fe->fontDef.pointSize > QCoreTextFontEngine::antialiasingThreshold)
                         && !(fe->fontDef.styleStrategy & QFont::NoAntialias));
    const bool lineAA = state->renderHints() & QPainter::Antialiasing;
    if (textAA != lineAA)
        CGContextSetShouldAntialias(d->hd, textAA);

    if (ti.glyphs.numGlyphs) {
        switch (fe->type()) {
        case QFontEngine::Mac:
            static_cast<QCoreTextFontEngine *>(fe)->draw(d->hd, pos.x(), pos.y(), ti, paintDevice()->height());
            break;
        case QFontEngine::Box:
            d->drawBoxTextItem(pos, ti);
            break;
        default:
            break;
        }
    }

    if (textAA != lineAA)
        CGContextSetShouldAntialias(d->hd, !textAA);

    updatePen(oldPen);
    updateBrush(oldBrush, oldBrushOrigin);
}

QPainter::RenderHints
QCoreGraphicsPaintEngine::supportedRenderHints() const
{
    return QPainter::RenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform);
}
enum CGCompositeMode {
        kCGCompositeModeClear            = 0,
        kCGCompositeModeCopy             = 1,
        kCGCompositeModeSourceOver       = 2,
        kCGCompositeModeSourceIn         = 3,
        kCGCompositeModeSourceOut        = 4,
        kCGCompositeModeSourceAtop       = 5,
        kCGCompositeModeDestinationOver  = 6,
        kCGCompositeModeDestinationIn    = 7,
        kCGCompositeModeDestinationOut   = 8,
        kCGCompositeModeDestinationAtop  = 9,
        kCGCompositeModeXOR              = 10,
        kCGCompositeModePlusDarker       = 11, // (max (0, (1-d) + (1-s)))
        kCGCompositeModePlusLighter      = 12, // (min (1, s + d))
    };
extern "C" {
    extern void CGContextSetCompositeOperation(CGContextRef, int);
} // private function, but is in all versions of OS X.
void
QCoreGraphicsPaintEngine::updateCompositionMode(QPainter::CompositionMode mode)
{
#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5) {
        int cg_mode = kCGBlendModeNormal;
        switch (mode) {
        case QPainter::CompositionMode_Multiply:
            cg_mode = kCGBlendModeMultiply;
            break;
        case QPainter::CompositionMode_Screen:
            cg_mode = kCGBlendModeScreen;
            break;
        case QPainter::CompositionMode_Overlay:
            cg_mode = kCGBlendModeOverlay;
            break;
        case QPainter::CompositionMode_Darken:
            cg_mode = kCGBlendModeDarken;
            break;
        case QPainter::CompositionMode_Lighten:
            cg_mode = kCGBlendModeLighten;
            break;
        case QPainter::CompositionMode_ColorDodge:
            cg_mode = kCGBlendModeColorDodge;
            break;
        case QPainter::CompositionMode_ColorBurn:
            cg_mode = kCGBlendModeColorBurn;
            break;
        case QPainter::CompositionMode_HardLight:
            cg_mode = kCGBlendModeHardLight;
            break;
        case QPainter::CompositionMode_SoftLight:
            cg_mode = kCGBlendModeSoftLight;
            break;
        case QPainter::CompositionMode_Difference:
            cg_mode = kCGBlendModeDifference;
            break;
        case QPainter::CompositionMode_Exclusion:
            cg_mode = kCGBlendModeExclusion;
            break;
        case QPainter::CompositionMode_Plus:
            cg_mode = kCGBlendModePlusLighter;
            break;
        case QPainter::CompositionMode_SourceOver:
            cg_mode = kCGBlendModeNormal;
            break;
        case QPainter::CompositionMode_DestinationOver:
            cg_mode = kCGBlendModeDestinationOver;
            break;
        case QPainter::CompositionMode_Clear:
            cg_mode = kCGBlendModeClear;
            break;
        case QPainter::CompositionMode_Source:
            cg_mode = kCGBlendModeCopy;
            break;
        case QPainter::CompositionMode_Destination:
            cg_mode = -1;
            break;
        case QPainter::CompositionMode_SourceIn:
            cg_mode = kCGBlendModeSourceIn;
            break;
        case QPainter::CompositionMode_DestinationIn:
            cg_mode = kCGCompositeModeDestinationIn;
            break;
        case QPainter::CompositionMode_SourceOut:
            cg_mode = kCGBlendModeSourceOut;
            break;
        case QPainter::CompositionMode_DestinationOut:
            cg_mode = kCGBlendModeDestinationOver;
            break;
        case QPainter::CompositionMode_SourceAtop:
            cg_mode = kCGBlendModeSourceAtop;
            break;
        case QPainter::CompositionMode_DestinationAtop:
            cg_mode = kCGBlendModeDestinationAtop;
            break;
        case QPainter::CompositionMode_Xor:
            cg_mode = kCGBlendModeXOR;
            break;
        default:
            break;
        }
        if (cg_mode > -1) {
            CGContextSetBlendMode(d_func()->hd, CGBlendMode(cg_mode));
        }
    } else
#endif
    // The standard porter duff ops.
    if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_3
            && mode <= QPainter::CompositionMode_Xor) {
        int cg_mode = kCGCompositeModeCopy;
        switch (mode) {
        case QPainter::CompositionMode_SourceOver:
            cg_mode = kCGCompositeModeSourceOver;
            break;
        case QPainter::CompositionMode_DestinationOver:
            cg_mode = kCGCompositeModeDestinationOver;
            break;
        case QPainter::CompositionMode_Clear:
            cg_mode = kCGCompositeModeClear;
            break;
        default:
            qWarning("QCoreGraphicsPaintEngine: Unhandled composition mode %d", (int)mode);
            break;
        case QPainter::CompositionMode_Source:
            cg_mode = kCGCompositeModeCopy;
            break;
        case QPainter::CompositionMode_Destination:
            cg_mode = CGCompositeMode(-1);
            break;
        case QPainter::CompositionMode_SourceIn:
            cg_mode = kCGCompositeModeSourceIn;
            break;
        case QPainter::CompositionMode_DestinationIn:
            cg_mode = kCGCompositeModeDestinationIn;
            break;
        case QPainter::CompositionMode_SourceOut:
            cg_mode = kCGCompositeModeSourceOut;
            break;
        case QPainter::CompositionMode_DestinationOut:
            cg_mode = kCGCompositeModeDestinationOut;
            break;
        case QPainter::CompositionMode_SourceAtop:
            cg_mode = kCGCompositeModeSourceAtop;
            break;
        case QPainter::CompositionMode_DestinationAtop:
            cg_mode = kCGCompositeModeDestinationAtop;
            break;
        case QPainter::CompositionMode_Xor:
            cg_mode = kCGCompositeModeXOR;
            break;
        }
        if (cg_mode > -1)
            CGContextSetCompositeOperation(d_func()->hd, CGCompositeMode(cg_mode));
    } else {
#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4)
        bool needPrivateAPI = false;
        if (QSysInfo::MacintoshVersion >= QSysInfo::MV_10_4) {
            int cg_mode = kCGBlendModeNormal;
            switch (mode) {
            case QPainter::CompositionMode_Multiply:
                cg_mode = kCGBlendModeMultiply;
                break;
            case QPainter::CompositionMode_Screen:
                cg_mode = kCGBlendModeScreen;
                break;
            case QPainter::CompositionMode_Overlay:
                cg_mode = kCGBlendModeOverlay;
                break;
            case QPainter::CompositionMode_Darken:
                cg_mode = kCGBlendModeDarken;
                break;
            case QPainter::CompositionMode_Lighten:
                cg_mode = kCGBlendModeLighten;
                break;
            case QPainter::CompositionMode_ColorDodge:
                cg_mode = kCGBlendModeColorDodge;
                break;
            case QPainter::CompositionMode_ColorBurn:
                cg_mode = kCGBlendModeColorBurn;
                break;
            case QPainter::CompositionMode_HardLight:
                cg_mode = kCGBlendModeHardLight;
                break;
            case QPainter::CompositionMode_SoftLight:
                cg_mode = kCGBlendModeSoftLight;
                break;
            case QPainter::CompositionMode_Difference:
                cg_mode = kCGBlendModeDifference;
                break;
            case QPainter::CompositionMode_Exclusion:
                cg_mode = kCGBlendModeExclusion;
                break;
            case QPainter::CompositionMode_Plus:
                needPrivateAPI = true;
                cg_mode = kCGCompositeModePlusLighter;
                break;
            default:
                break;
            }
            if (!needPrivateAPI)
                CGContextSetBlendMode(d_func()->hd, CGBlendMode(cg_mode));
            else
                CGContextSetCompositeOperation(d_func()->hd, CGCompositeMode(cg_mode));
        }
#endif
    }
}

void
QCoreGraphicsPaintEngine::updateRenderHints(QPainter::RenderHints hints)
{
    Q_D(QCoreGraphicsPaintEngine);
    CGContextSetShouldAntialias(d->hd, hints & QPainter::Antialiasing);
    static const CGFloat ScaleFactor = qt_mac_get_scalefactor();
    if (ScaleFactor > 1.) {
        CGContextSetInterpolationQuality(d->hd, kCGInterpolationHigh);
    } else {
        CGContextSetInterpolationQuality(d->hd, (hints & QPainter::SmoothPixmapTransform) ?
                                         kCGInterpolationHigh : kCGInterpolationNone);
    }
    bool textAntialiasing = (hints & QPainter::TextAntialiasing) == QPainter::TextAntialiasing;
    if (!textAntialiasing || d->disabledSmoothFonts) {
        d->disabledSmoothFonts = !textAntialiasing;
        CGContextSetShouldSmoothFonts(d->hd, textAntialiasing);
    }
}

/*
    Returns the size of one device pixel in user-space coordinates.
*/
QPointF QCoreGraphicsPaintEnginePrivate::devicePixelSize(CGContextRef)
{
    QPointF p1 = current.transform.inverted().map(QPointF(0, 0));
    QPointF p2 = current.transform.inverted().map(QPointF(1, 1));
    return QPointF(qAbs(p2.x() - p1.x()), qAbs(p2.y() - p1.y()));
}

/*
    Adjusts the pen width so we get correct line widths in the
    non-transformed, aliased case.
*/
float QCoreGraphicsPaintEnginePrivate::adjustPenWidth(float penWidth)
{
    Q_Q(QCoreGraphicsPaintEngine);
    float ret = penWidth;
    if (!complexXForm && !(q->state->renderHints() & QPainter::Antialiasing)) {
        if (penWidth < 2)
            ret = 1;
        else if (penWidth < 3)
            ret = 1.5;
        else
            ret = penWidth -1;
    }
    return ret;
}

void
QCoreGraphicsPaintEnginePrivate::setStrokePen(const QPen &pen)
{
    //pencap
    CGLineCap cglinecap = kCGLineCapButt;
    if (pen.capStyle() == Qt::SquareCap)
        cglinecap = kCGLineCapSquare;
    else if (pen.capStyle() == Qt::RoundCap)
        cglinecap = kCGLineCapRound;
    CGContextSetLineCap(hd, cglinecap);
    CGContextSetLineWidth(hd, adjustPenWidth(pen.widthF()));

    //join
    CGLineJoin cglinejoin = kCGLineJoinMiter;
    if (pen.joinStyle() == Qt::BevelJoin)
        cglinejoin = kCGLineJoinBevel;
    else if (pen.joinStyle() == Qt::RoundJoin)
        cglinejoin = kCGLineJoinRound;
    CGContextSetLineJoin(hd, cglinejoin);
//    CGContextSetMiterLimit(hd, pen.miterLimit());

    //pen style
    QVector<CGFloat> linedashes;
    if (pen.style() == Qt::CustomDashLine) {
        QVector<qreal> customs = pen.dashPattern();
        for (int i = 0; i < customs.size(); ++i)
            linedashes.append(customs.at(i));
    } else if (pen.style() == Qt::DashLine) {
        linedashes.append(4);
        linedashes.append(2);
    } else if (pen.style() == Qt::DotLine) {
        linedashes.append(1);
        linedashes.append(2);
    } else if (pen.style() == Qt::DashDotLine) {
        linedashes.append(4);
        linedashes.append(2);
        linedashes.append(1);
        linedashes.append(2);
    } else if (pen.style() == Qt::DashDotDotLine) {
        linedashes.append(4);
        linedashes.append(2);
        linedashes.append(1);
        linedashes.append(2);
        linedashes.append(1);
        linedashes.append(2);
    }
    const CGFloat cglinewidth = pen.widthF() <= 0.0f ? 1.0f : float(pen.widthF());
    for (int i = 0; i < linedashes.size(); ++i) {
        linedashes[i] *= cglinewidth;
        if (cglinewidth < 3 && (cglinecap == kCGLineCapSquare || cglinecap == kCGLineCapRound)) {
            if ((i%2))
                linedashes[i] += cglinewidth/2;
            else
                linedashes[i] -= cglinewidth/2;
        }
    }
    CGContextSetLineDash(hd, pen.dashOffset() * cglinewidth, linedashes.data(), linedashes.size());

    // color
    CGContextSetStrokeColorWithColor(hd, cgColorForQColor(pen.color(), pdev));
}

// Add our own patterns here to deal with the fact that the coordinate system
// is flipped vertically with Quartz2D.
static const uchar *qt_mac_patternForBrush(int brushStyle)
{
    Q_ASSERT(brushStyle > Qt::SolidPattern && brushStyle < Qt::LinearGradientPattern);
    static const uchar dense1_pat[] = { 0x00, 0x00, 0x44, 0x00, 0x00, 0x00, 0x44, 0x00 };
    static const uchar dense2_pat[] = { 0x00, 0x22, 0x00, 0x88, 0x00, 0x22, 0x00, 0x88 };
    static const uchar dense3_pat[] = { 0x11, 0xaa, 0x44, 0xaa, 0x11, 0xaa, 0x44, 0xaa };
    static const uchar dense4_pat[] = { 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55 };
    static const uchar dense5_pat[] = { 0xee, 0x55, 0xbb, 0x55, 0xee, 0x55, 0xbb, 0x55 };
    static const uchar dense6_pat[] = { 0xff, 0xdd, 0xff, 0x77, 0xff, 0xdd, 0xff, 0x77 };
    static const uchar dense7_pat[] = { 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb, 0xff };
    static const uchar hor_pat[]    = { 0xff, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff };
    static const uchar ver_pat[]    = { 0xef, 0xef, 0xef, 0xef, 0xef, 0xef, 0xef, 0xef };
    static const uchar cross_pat[]  = { 0xef, 0xef, 0xef, 0xef, 0x00, 0xef, 0xef, 0xef };
    static const uchar fdiag_pat[]  = { 0x7f, 0xbf, 0xdf, 0xef, 0xf7, 0xfb, 0xfd, 0xfe };
    static const uchar bdiag_pat[]  = { 0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f };
    static const uchar dcross_pat[] = { 0x7e, 0xbd, 0xdb, 0xe7, 0xe7, 0xdb, 0xbd, 0x7e };
    static const uchar *const pat_tbl[] = {
        dense1_pat, dense2_pat, dense3_pat, dense4_pat, dense5_pat,
        dense6_pat, dense7_pat,
        hor_pat, ver_pat, cross_pat, bdiag_pat, fdiag_pat, dcross_pat };
    return pat_tbl[brushStyle - Qt::Dense1Pattern];
}

void QCoreGraphicsPaintEnginePrivate::setFillBrush(const QPointF &offset)
{
    // pattern
    Qt::BrushStyle bs = current.brush.style();
#ifdef QT_MAC_USE_NATIVE_GRADIENTS
    if (bs == Qt::LinearGradientPattern || bs == Qt::RadialGradientPattern) {
        const QGradient *grad = static_cast<const QGradient*>(current.brush.gradient());
        if (drawGradientNatively(grad)) {
            Q_ASSERT(grad->spread() == QGradient::PadSpread);

            static const CGFloat domain[] = { 0.0f, +1.0f };
            static const CGFunctionCallbacks callbacks = { 0, qt_mac_color_gradient_function, 0 };
            CGFunctionRef fill_func = CGFunctionCreate(reinterpret_cast<void *>(&current.brush),
                    1, domain, 4, 0, &callbacks);

            CGColorSpaceRef colorspace = qt_mac_colorSpaceForDeviceType(pdev);
            if (bs == Qt::LinearGradientPattern) {
                const QLinearGradient *linearGrad = static_cast<const QLinearGradient *>(grad);
                const QPointF start(linearGrad->start());
                const QPointF stop(linearGrad->finalStop());
                shading = CGShadingCreateAxial(colorspace, CGPointMake(start.x(), start.y()),
                                               CGPointMake(stop.x(), stop.y()), fill_func, true, true);
            } else {
                Q_ASSERT(bs == Qt::RadialGradientPattern);
                const QRadialGradient *radialGrad = static_cast<const QRadialGradient *>(grad);
                QPointF center(radialGrad->center());
                QPointF focal(radialGrad->focalPoint());
                qreal radius = radialGrad->radius();
                qreal focalRadius = radialGrad->focalRadius();
                shading = CGShadingCreateRadial(colorspace, CGPointMake(focal.x(), focal.y()),
                                                focalRadius, CGPointMake(center.x(), center.y()), radius, fill_func, false, true);
            }

            CGFunctionRelease(fill_func);
        }
    } else
#endif
    if (bs != Qt::SolidPattern && bs != Qt::NoBrush
#ifndef QT_MAC_USE_NATIVE_GRADIENTS
       && (bs < Qt::LinearGradientPattern || bs > Qt::ConicalGradientPattern)
#endif
        )
    {
        QMacPattern *qpattern = new QMacPattern;
        qpattern->pdev = pdev;
        CGFloat components[4] = { 1.0, 1.0, 1.0, 1.0 };
        CGColorSpaceRef base_colorspace = 0;
        if (bs == Qt::TexturePattern) {
            qpattern->data.pixmap = current.brush.texture();
            if (qpattern->data.pixmap.isQBitmap()) {
                const QColor &col = current.brush.color();
                components[0] = qt_mac_convert_color_to_cg(col.red());
                components[1] = qt_mac_convert_color_to_cg(col.green());
                components[2] = qt_mac_convert_color_to_cg(col.blue());
                base_colorspace = QCoreGraphicsPaintEngine::macGenericColorSpace();
            }
        } else {
            qpattern->as_mask = true;

            qpattern->data.bytes = qt_mac_patternForBrush(bs);
            const QColor &col = current.brush.color();
            components[0] = qt_mac_convert_color_to_cg(col.red());
            components[1] = qt_mac_convert_color_to_cg(col.green());
            components[2] = qt_mac_convert_color_to_cg(col.blue());
            base_colorspace = QCoreGraphicsPaintEngine::macGenericColorSpace();
        }
        int width = qpattern->width(), height = qpattern->height();
        qpattern->foreground = current.brush.color();

        CGColorSpaceRef fill_colorspace = CGColorSpaceCreatePattern(base_colorspace);
        CGContextSetFillColorSpace(hd, fill_colorspace);

        CGAffineTransform xform = CGContextGetCTM(hd);
        xform = CGAffineTransformConcat(qt_mac_convert_transform_to_cg(current.brush.transform()), xform);
        xform = CGAffineTransformTranslate(xform, offset.x(), offset.y());

        CGPatternCallbacks callbks;
        callbks.version = 0;
        callbks.drawPattern = qt_mac_draw_pattern;
        callbks.releaseInfo = qt_mac_dispose_pattern;
        CGPatternRef fill_pattern = CGPatternCreate(qpattern, CGRectMake(0, 0, width, height),
                xform, width, height, kCGPatternTilingNoDistortion,
                !base_colorspace, &callbks);
        CGContextSetFillPattern(hd, fill_pattern, components);

        CGPatternRelease(fill_pattern);
        CGColorSpaceRelease(fill_colorspace);
    } else if (bs != Qt::NoBrush) {
        CGContextSetFillColorWithColor(hd, cgColorForQColor(current.brush.color(), pdev));
    }
}

void
QCoreGraphicsPaintEnginePrivate::setClip(const QRegion *rgn)
{
    Q_Q(QCoreGraphicsPaintEngine);
    if (hd) {
        resetClip();
        QRegion sysClip = q->systemClip();
        if (!sysClip.isEmpty())
            qt_mac_clip_cg(hd, sysClip, &orig_xform);
        if (rgn)
            qt_mac_clip_cg(hd, *rgn, 0);
    }
}

struct qt_mac_cg_transform_path {
    CGMutablePathRef path;
    CGAffineTransform transform;
};

void qt_mac_cg_transform_path_apply(void *info, const CGPathElement *element)
{
    Q_ASSERT(info && element);
    qt_mac_cg_transform_path *t = (qt_mac_cg_transform_path*)info;
    switch (element->type) {
    case kCGPathElementMoveToPoint:
        CGPathMoveToPoint(t->path, &t->transform, element->points[0].x, element->points[0].y);
        break;
    case kCGPathElementAddLineToPoint:
        CGPathAddLineToPoint(t->path, &t->transform, element->points[0].x, element->points[0].y);
        break;
    case kCGPathElementAddQuadCurveToPoint:
        CGPathAddQuadCurveToPoint(t->path, &t->transform, element->points[0].x, element->points[0].y,
                                  element->points[1].x, element->points[1].y);
        break;
    case kCGPathElementAddCurveToPoint:
        CGPathAddCurveToPoint(t->path, &t->transform, element->points[0].x, element->points[0].y,
                              element->points[1].x, element->points[1].y,
                              element->points[2].x, element->points[2].y);
        break;
    case kCGPathElementCloseSubpath:
        CGPathCloseSubpath(t->path);
        break;
    default:
        qDebug() << "Unhandled path transform type: " << element->type;
    }
}

void QCoreGraphicsPaintEnginePrivate::drawPath(uchar ops, CGMutablePathRef path)
{
    Q_Q(QCoreGraphicsPaintEngine);
    Q_ASSERT((ops & (CGFill | CGEOFill)) != (CGFill | CGEOFill)); //can't really happen
    if ((ops & (CGFill | CGEOFill))) {
        if (shading) {
            Q_ASSERT(path);
            CGContextBeginPath(hd);
            CGContextAddPath(hd, path);
            saveGraphicsState();
            if (ops & CGFill)
                CGContextClip(hd);
            else if (ops & CGEOFill)
                CGContextEOClip(hd);
            if (current.brush.gradient()->coordinateMode() == QGradient::ObjectBoundingMode) {
                CGRect boundingBox = CGPathGetBoundingBox(path);
                CGContextConcatCTM(hd,
                    CGAffineTransformMake(boundingBox.size.width, 0,
                                          0, boundingBox.size.height,
                                          boundingBox.origin.x, boundingBox.origin.y));
            }
            CGContextDrawShading(hd, shading);
            restoreGraphicsState();
            ops &= ~CGFill;
            ops &= ~CGEOFill;
        } else if (current.brush.style() == Qt::NoBrush) {
            ops &= ~CGFill;
            ops &= ~CGEOFill;
        }
    }
    if ((ops & CGStroke) && current.pen.style() == Qt::NoPen)
        ops &= ~CGStroke;

    if (ops & (CGEOFill | CGFill)) {
        CGContextBeginPath(hd);
        CGContextAddPath(hd, path);
        if (ops & CGEOFill) {
            CGContextEOFillPath(hd);
        } else {
            CGContextFillPath(hd);
        }
    }

    // Avoid saving and restoring the context if we can.
    const bool needContextSave = (cosmeticPen != QCoreGraphicsPaintEnginePrivate::CosmeticNone ||
                                  !(q->state->renderHints() & QPainter::Antialiasing));
    if (ops & CGStroke) {
        if (needContextSave)
            saveGraphicsState();
        CGContextBeginPath(hd);

        // Translate a fraction of a pixel size in the y direction
        // to make sure that primitives painted at pixel borders
        // fills the right pixel. This is needed since the y xais
        // in the Quartz coordinate system is inverted compared to Qt.
        if (!(q->state->renderHints() & QPainter::Antialiasing)) {
            if (current.pen.style() == Qt::SolidLine || current.pen.width() >= 3)
                CGContextTranslateCTM(hd, double(pixelSize.x()) * 0.25, double(pixelSize.y()) * 0.25);
            else if (current.pen.style() == Qt::DotLine && QSysInfo::MacintoshVersion == QSysInfo::MV_10_3)
                ; // Do nothing.
            else
                CGContextTranslateCTM(hd, 0, double(pixelSize.y()) * 0.1);
        }

        if (cosmeticPen != QCoreGraphicsPaintEnginePrivate::CosmeticNone) {
            // If antialiazing is enabled, use the cosmetic pen size directly.
            if (q->state->renderHints() & QPainter::Antialiasing)
                CGContextSetLineWidth(hd,  cosmeticPenSize);
            else if (current.pen.widthF() <= 1)
                CGContextSetLineWidth(hd, cosmeticPenSize * 0.9f);
            else
                CGContextSetLineWidth(hd, cosmeticPenSize);
        }
        if (cosmeticPen == QCoreGraphicsPaintEnginePrivate::CosmeticTransformPath) {
            qt_mac_cg_transform_path t;
            t.transform = qt_mac_convert_transform_to_cg(current.transform);
            t.path = CGPathCreateMutable();
            CGPathApply(path, &t, qt_mac_cg_transform_path_apply); //transform the path
            setTransform(0); //unset the context transform
            CGContextSetLineWidth(hd,  cosmeticPenSize);
            CGContextAddPath(hd, t.path);
            CGPathRelease(t.path);
        } else {
            CGContextAddPath(hd, path);
        }

        CGContextStrokePath(hd);
        if (needContextSave)
            restoreGraphicsState();
    }
}

QT_END_NAMESPACE