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#include "qwindowsurface_mac_p.h"

#include <private/qt_mac_p.h>

#include <private/qt_cocoa_helpers_mac_p.h>

#include <QtGui/qwidget.h>

QT_BEGIN_NAMESPACE

struct QMacWindowSurfacePrivate

{

    QWidget *widget;

    QPixmap device;

};

QMacWindowSurface::QMacWindowSurface(QWidget *widget)

    : QWindowSurface(widget), d_ptr(new QMacWindowSurfacePrivate)

{

    d_ptr->widget = widget;

}

QMacWindowSurface::~QMacWindowSurface()

{

    delete d_ptr;

}

QPaintDevice *QMacWindowSurface::paintDevice()

{

    return &d_ptr->device;

}

void QMacWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint &offset)

{

    Q_UNUSED(offset);

    // Get a context for the widget.

#ifndef QT_MAC_USE_COCOA

    CGContextRef context;

    CGrafPtr port = GetWindowPort(qt_mac_window_for(widget));

    QDBeginCGContext(port, &context);

#else

    extern CGContextRef qt_mac_graphicsContextFor(QWidget *);

    CGContextRef context = qt_mac_graphicsContextFor(widget);

#endif

    CGContextSaveGState(context);

    // Flip context.

    CGContextTranslateCTM(context, 0, widget->height());

    CGContextScaleCTM(context, 1, -1);

    // Clip to region.

    const QVector<QRect> &rects = rgn.rects();

    for (int i = 0; i < rects.size(); ++i) {

        const QRect &rect = rects.at(i);

        CGContextAddRect(context, CGRectMake(rect.x(), rect.y(), rect.width(), rect.height()));

    }

    CGContextClip(context);

    // Draw the image onto the window.

    const CGRect dest = CGRectMake(0, 0, widget->width(), widget->height());

    const CGImageRef image = d_ptr->device.toMacCGImageRef();

    qt_mac_drawCGImage(context, &dest, image);

    CFRelease(image);

    // Restore context.

    CGContextRestoreGState(context);

#ifndef QT_MAC_USE_COCOA

    QDEndCGContext(port, &context);

#else

    CGContextFlush(context);

#endif

}

void QMacWindowSurface::setGeometry(const QRect &rect)

{

    QWindowSurface::setGeometry(rect);

    const QSize size = rect.size();

    if (d_ptr->device.size() != size)

        d_ptr->device = QPixmap(size);

}

bool QMacWindowSurface::scroll(const QRegion &area, int dx, int dy)

{

    if (d_ptr->device.size().isNull())

        return false;

    QCFType<CGImageRef> image = d_ptr->device.toMacCGImageRef();

    const QRect rect(area.boundingRect());

    const CGRect dest = CGRectMake(rect.x(), rect.y(), rect.width(), rect.height());

    QCFType<CGImageRef> subimage = CGImageCreateWithImageInRect(image, dest);

    QCFType<CGContextRef> context = qt_mac_cg_context(&d_ptr->device);

    CGContextTranslateCTM(context, dx, dy);

    qt_mac_drawCGImage(context, &dest, subimage);

    return true;

}

QT_END_NAMESPACE