/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, 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

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**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

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** $QT_END_LICENSE$

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****************************************************************************/

#include "qatomic.h"

#include "qbitmap.h"

#include "qbuffer.h"

#include "qimage.h"

#include "qpolygon.h"

#include "qregion.h"

#include "qt_windows.h"

#include "qpainterpath.h"

QT_BEGIN_NAMESPACE

QRegion::QRegionData QRegion::shared_empty = { Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0 };

HRGN qt_tryCreateRegion(QRegion::RegionType type, int left, int top, int right, int bottom)

{

    const int tries = 10;

    for (int i = 0; i < tries; ++i) {

        HRGN region = 0;

        switch (type) {

        case QRegion::Rectangle:

            region = CreateRectRgn(left, top, right, bottom);

            break;

        case QRegion::Ellipse:

#ifndef Q_OS_WINCE

            region = CreateEllipticRgn(left, top, right, bottom);

#endif

            break;

        }

        if (region) {

            if (GetRegionData(region, 0, 0))

                return region;

            else

                DeleteObject(region);

        }

    }

    return 0;

}

QRegion qt_region_from_HRGN(HRGN rgn)

{

    int numBytes = GetRegionData(rgn, 0, 0);

    if (numBytes == 0)

        return QRegion();

    char *buf = new char[numBytes];

    if (buf == 0)

        return QRegion();

    RGNDATA *rd = reinterpret_cast<RGNDATA*>(buf);

    if (GetRegionData(rgn, numBytes, rd) == 0) {

        delete [] buf;

        return QRegion();

    }

    QRegion region;

    RECT *r = reinterpret_cast<RECT*>(rd->Buffer);

    for (uint i = 0; i < rd->rdh.nCount; ++i) {

        QRect rect;

        rect.setCoords(r->left, r->top, r->right - 1, r->bottom - 1);

        ++r;

        region |= rect;

    }

    delete [] buf;

    return region;

}

void qt_win_dispose_rgn(HRGN r)

{

    if (r)

        DeleteObject(r);

}

static void qt_add_rect(HRGN &winRegion, QRect r)

{

    HRGN rgn = CreateRectRgn(r.left(), r.top(), r.x() + r.width(), r.y() + r.height());

    if (rgn) {

        HRGN dest = CreateRectRgn(0,0,0,0);

        int result = CombineRgn(dest, winRegion, rgn, RGN_OR);

        if (result) {

            DeleteObject(winRegion);

            winRegion = dest;

        }

        DeleteObject(rgn);

    }

}

void QRegion::ensureHandle() const

{

    if (d->rgn)

        DeleteObject(d->rgn);

    d->rgn = CreateRectRgn(0,0,0,0);

    if (d->qt_rgn) {

        if (d->qt_rgn->numRects == 1) {

            QRect r = d->qt_rgn->extents;

            qt_add_rect(d->rgn, r);

            return;

        }

        for (int i = 0;i < d->qt_rgn->numRects;i++) {

            QRect r = d->qt_rgn->rects.at(i);

            qt_add_rect(d->rgn, r);

        }

    }

}

QT_END_NAMESPACE