94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/* -*- 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 INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
|
|
#define INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
|
|
|
|
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( nullptr ),
|
|
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 // INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|