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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef VCL_SCOPEDBITMAPACCESS_HXX_INCLUDED
+#define VCL_SCOPEDBITMAPACCESS_HXX_INCLUDED
+
+namespace vcl
+{
+
+/** This template handles BitmapAccess the RAII way.
+
+ Please don't use directly, but through the ready-made typedefs
+ ScopedReadAccess and ScopedWriteAccess in classes Bitmap and
+ AlphaMask.
+
+ Use as follows:
+ Bitmap aBitmap;
+ Bitmap::ScopedReadAccess pReadAccess( aBitmap );
+ pReadAccess->SetPixel()...
+
+ Bitmap aBitmap2;
+ Bitmap::ScopedWriteAccess pWriteAccess( bCond ? aBitmap2.AcquireWriteAccess() : 0, aBitmap2 );
+ if ( pWriteAccess )...
+
+ @attention for practical reasons, ScopedBitmapAccess stores a
+ reference to the provided bitmap, thus, make sure that the bitmap
+ specified at construction time lives at least as long as the
+ ScopedBitmapAccess.
+ */
+template < class Access, class Bitmap, Access* (Bitmap::* Acquire)() > class ScopedBitmapAccess
+{
+ typedef ScopedBitmapAccess< Access, Bitmap, Acquire > self_type;
+ typedef bool (self_type::* unspecified_bool_type)() const;
+
+public:
+ explicit ScopedBitmapAccess( Bitmap& rBitmap ) :
+ mpAccess( 0 ),
+ mrBitmap( rBitmap )
+ {
+ mpAccess = (mrBitmap.*Acquire)();
+ }
+
+ ScopedBitmapAccess( Access* pAccess, Bitmap& rBitmap ) :
+ mpAccess( pAccess ),
+ mrBitmap( rBitmap )
+ {
+ }
+
+ ~ScopedBitmapAccess()
+ {
+ mrBitmap.ReleaseAccess( mpAccess );
+ }
+
+ bool operator!() const { return !mpAccess; }
+ operator unspecified_bool_type() const
+ {
+ return mpAccess ? &self_type::operator! : 0;
+ }
+
+ Access* get() { return mpAccess; }
+ const Access* get() const { return mpAccess; }
+
+ Access* operator->() { return mpAccess; }
+ const Access* operator->() const { return mpAccess; }
+
+ Access& operator*() { return *mpAccess; }
+ const Access& operator*() const { return *mpAccess; }
+
+private:
+ Access* mpAccess;
+ Bitmap& mrBitmap;
+};
+
+}
+
+#endif // VCL_SCOPEDBITMAPACCESS_HXX_INCLUDED
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */