prevent insane memory allocation

We release the memory in the next call again.

Change-Id: I9cd974f2c1b2381d0a895bea52a8654143862971

vcl/inc/impbmp.hxx

@@ -38,6 +38,13 @@ private:
 
 public:
                         ImpBitmap();
+                        /**
+                         * takes ownership
+                         * same as Sequence:
+                         * pBmp = new ImpBitmap;
+                         * pBmp->ImplSetSalBitmap(pBitmap);
+                         */
+                        ImpBitmap(SalBitmap* pBitmap);
                         ~ImpBitmap();
 
     void                ImplSetSalBitmap( SalBitmap* pSalBitmap );

vcl/source/gdi/impbmp.cxx

@@ -31,6 +31,13 @@ ImpBitmap::ImpBitmap() :
 {
 }
 
+ImpBitmap::ImpBitmap(SalBitmap* pBitmap) :
+            mnRefCount  ( 1 ),
+            mnChecksum  ( 0 ),
+            mpSalBitmap ( pBitmap )
+{
+}
+
 ImpBitmap::~ImpBitmap()
 {
     delete mpSalBitmap;

vcl/source/outdev/bitmap.cxx

@@ -457,8 +457,7 @@ Bitmap OutputDevice::GetBitmap( const Point& rSrcPt, const Size& rSize ) const
 
                 if( pSalBmp )
                 {
-                    ImpBitmap* pImpBmp = new ImpBitmap;
-                    pImpBmp->ImplSetSalBitmap( pSalBmp );
+                    ImpBitmap* pImpBmp = new ImpBitmap(pSalBmp);
                     aBmp.ImplSetImpBitmap( pImpBmp );
                 }
             }