/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qatomic.h"+
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#include "qbitmap.h"+
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#include "qbuffer.h"+
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#include "qimage.h"+
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#include "qpolygon.h"+
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#include "qregion.h"+
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#include "qt_windows.h"+
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#include "qpainterpath.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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QRegion::QRegionData QRegion::shared_empty = { Q_BASIC_ATOMIC_INITIALIZER(1), 0, 0 };+
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+
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HRGN qt_tryCreateRegion(QRegion::RegionType type, int left, int top, int right, int bottom)+
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{+
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    const int tries = 10;+
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    for (int i = 0; i < tries; ++i) {+
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        HRGN region = 0;+
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        switch (type) {+
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        case QRegion::Rectangle:+
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            region = CreateRectRgn(left, top, right, bottom);+
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            break;+
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        case QRegion::Ellipse:+
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#ifndef Q_OS_WINCE+
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            region = CreateEllipticRgn(left, top, right, bottom);+
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#endif+
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            break;+
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        }+
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        if (region) {+
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            if (GetRegionData(region, 0, 0))+
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                return region;+
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            else+
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                DeleteObject(region);+
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        }+
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    }+
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    return 0;+
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}+
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+
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QRegion qt_region_from_HRGN(HRGN rgn)+
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{+
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    int numBytes = GetRegionData(rgn, 0, 0);+
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    if (numBytes == 0)+
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        return QRegion();+
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+
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    char *buf = new char[numBytes];+
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    if (buf == 0)+
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        return QRegion();+
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+
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    RGNDATA *rd = reinterpret_cast<RGNDATA*>(buf);+
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    if (GetRegionData(rgn, numBytes, rd) == 0) {+
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        delete [] buf;+
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        return QRegion();+
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    }+
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+
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    QRegion region;+
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    RECT *r = reinterpret_cast<RECT*>(rd->Buffer);+
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    for (uint i = 0; i < rd->rdh.nCount; ++i) {+
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        QRect rect;+
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        rect.setCoords(r->left, r->top, r->right - 1, r->bottom - 1);+
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        ++r;+
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        region |= rect;+
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    }+
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+
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    delete [] buf;+
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+
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    return region;+
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}+
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+
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void qt_win_dispose_rgn(HRGN r)+
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{+
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    if (r)+
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        DeleteObject(r);+
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}+
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+
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static void qt_add_rect(HRGN &winRegion, QRect r)+
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{+
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    HRGN rgn = CreateRectRgn(r.left(), r.top(), r.x() + r.width(), r.y() + r.height());+
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    if (rgn) {+
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        HRGN dest = CreateRectRgn(0,0,0,0);+
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        int result = CombineRgn(dest, winRegion, rgn, RGN_OR);+
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        if (result) {+
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            DeleteObject(winRegion);+
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            winRegion = dest;+
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        }+
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        DeleteObject(rgn);+
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    }+
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}+
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+
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void QRegion::ensureHandle() const+
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{+
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    if (d->rgn)+
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        DeleteObject(d->rgn);+
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    d->rgn = CreateRectRgn(0,0,0,0);+
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    if (d->qt_rgn) {+
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        if (d->qt_rgn->numRects == 1) {+
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            QRect r = d->qt_rgn->extents;+
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            qt_add_rect(d->rgn, r);+
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            return;+
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        }+
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        for (int i = 0;i < d->qt_rgn->numRects;i++) {+
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            QRect r = d->qt_rgn->rects.at(i);+
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            qt_add_rect(d->rgn, r);+
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        }+
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    }+
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}+
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+
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+
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QT_END_NAMESPACE+
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