Add fromHRGN function.

Change-Id: Iae007306c4d75f650dcd0e319c4d553816e866f3
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/winextras/qwinfunctions.cpp

@@ -207,6 +207,34 @@ HRGN QWinExtras::toHRGN(const QRegion &region)
     return resultRgn;
 }
 
+/*!
+    \since 5.2
+
+    Returns a QRegion that is equivalent to the given \a hrgn.
+ */
+QRegion QWinExtras::fromHRGN(HRGN hrgn)
+{
+    DWORD regionDataSize = GetRegionData(hrgn, 0, NULL);
+    if (regionDataSize == 0)
+        return QRegion();
+
+    LPRGNDATA regionData = (LPRGNDATA)malloc(regionDataSize);
+    if (!regionData)
+        return QRegion();
+
+    QRegion region;
+    if (GetRegionData(hrgn, regionDataSize, regionData) == regionDataSize) {
+        LPRECT pRect = (LPRECT)regionData->Buffer;
+        for (DWORD i = 0; i < regionData->rdh.nCount; ++i)
+            region += QRect(pRect[i].left, pRect[i].top,
+                            pRect[i].right - pRect[i].left,
+                            pRect[i].bottom - pRect[i].top);
+    }
+
+    free(regionData);
+    return region;
+}
+
 /*!
     \since 5.2
 

src/winextras/qwinfunctions.h

@@ -77,6 +77,7 @@ HICON Q_WINEXTRAS_EXPORT toHICON(const QPixmap &p);
 QImage Q_WINEXTRAS_EXPORT imageFromHBITMAP(HDC hdc, HBITMAP bitmap, int width, int height);
 QPixmap Q_WINEXTRAS_EXPORT fromHICON(HICON icon);
 HRGN Q_WINEXTRAS_EXPORT toHRGN(const QRegion &region);
+QRegion Q_WINEXTRAS_EXPORT fromHRGN(HRGN hrgn);
 
 QString Q_WINEXTRAS_EXPORT stringFromHresult(HRESULT hresult);
 QString Q_WINEXTRAS_EXPORT errorStringFromHresult(HRESULT hresult);
@@ -252,6 +253,7 @@ HICON toHICON(const QPixmap &p);
 QImage imageFromHBITMAP(HDC hdc, HBITMAP bitmap, int w, int h);
 QPixmap fromHICON(HICON icon);
 HRGN toHRGN(const QRegion &region);
+QRegion fromHRGN(HRGN hrgn);
 QString stringFromHresult(HRESULT hresult);
 QString errorStringFromHresult(HRESULT hresult);
 QColor colorizationColor(bool *opaqueBlend = 0);