1 /****************************************************************************

     2 **

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

     4 ** All rights reserved.

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

     6 **

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

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

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

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

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

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

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

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "qatomic.h"

    43 #include "qbitmap.h"

    44 #include "qbuffer.h"

    45 #include "qimage.h"

    46 #include "qpolygon.h"

    47 #include "qregion.h"

    48 #include "qt_windows.h"

    49 #include "qpainterpath.h"

    50 

    51 QT_BEGIN_NAMESPACE

    52 

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

    54 

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

    56 {

    57     const int tries = 10;

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

    59         HRGN region = 0;

    60         switch (type) {

    61         case QRegion::Rectangle:

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

    63             break;

    64         case QRegion::Ellipse:

    65 #ifndef Q_OS_WINCE

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

    67 #endif

    68             break;

    69         }

    70         if (region) {

    71             if (GetRegionData(region, 0, 0))

    72                 return region;

    73             else

    74                 DeleteObject(region);

    75         }

    76     }

    77     return 0;

    78 }

    79 

    80 QRegion qt_region_from_HRGN(HRGN rgn)

    81 {

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

    83     if (numBytes == 0)

    84         return QRegion();

    85 

    86     char *buf = new char[numBytes];

    87     if (buf == 0)

    88         return QRegion();

    89 

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

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

    92         delete [] buf;

    93         return QRegion();

    94     }

    95 

    96     QRegion region;

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

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

    99         QRect rect;

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

   101         ++r;

   102         region |= rect;

   103     }

   104 

   105     delete [] buf;

   106 

   107     return region;

   108 }

   109 

   110 void qt_win_dispose_rgn(HRGN r)

   111 {

   112     if (r)

   113         DeleteObject(r);

   114 }

   115 

   116 static void qt_add_rect(HRGN &winRegion, QRect r)

   117 {

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

   119     if (rgn) {

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

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

   122         if (result) {

   123             DeleteObject(winRegion);

   124             winRegion = dest;

   125         }

   126         DeleteObject(rgn);

   127     }

   128 }

   129 

   130 void QRegion::ensureHandle() const

   131 {

   132     if (d->rgn)

   133         DeleteObject(d->rgn);

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

   135     if (d->qt_rgn) {

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

   137             QRect r = d->qt_rgn->extents;

   138             qt_add_rect(d->rgn, r);

   139             return;

   140         }

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

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

   143             qt_add_rect(d->rgn, r);

   144         }

   145     }

   146 }

   147 

   148 

   149 QT_END_NAMESPACE