953a5cb1c8
would have liked to make the AcquireWriteAccess methods DLLPRIVATE, but they are needed by the workbench and testing code Change-Id: I22497788eb68dfb84b7e542e5ef53322892a5274 Reviewed-on: https://gerrit.libreoffice.org/51310 Reviewed-by: Michael Meeks <michael.meeks@collabora.com> Tested-by: Jenkins <ci@libreoffice.org>
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
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#define INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
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namespace vcl
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{
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/** This template handles BitmapAccess the RAII way.
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Please don't use directly, but through the ready-made typedefs
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ScopedReadAccess and ScopedWriteAccess in classes Bitmap and
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AlphaMask.
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Use as follows:
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Bitmap aBitmap;
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Bitmap::ScopedReadAccess pReadAccess( aBitmap );
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pReadAccess->SetPixel()...
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Bitmap aBitmap2;
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BitmapScopedWriteAccess pWriteAccess( bCond ? aBitmap2.AcquireWriteAccess() : 0, aBitmap2 );
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if ( pWriteAccess )...
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@attention for practical reasons, ScopedBitmapAccess stores a
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reference to the provided bitmap, thus, make sure that the bitmap
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specified at construction time lives at least as long as the
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ScopedBitmapAccess.
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*/
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template < class Access, class Bitmap, Access* (Bitmap::* Acquire)() > class ScopedBitmapAccess
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{
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public:
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explicit ScopedBitmapAccess( Bitmap& rBitmap ) :
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mpAccess( nullptr ),
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mpBitmap( &rBitmap )
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{
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mpAccess = (mpBitmap->*Acquire)();
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}
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ScopedBitmapAccess( Access* pAccess, Bitmap& rBitmap ) :
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mpAccess( pAccess ),
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mpBitmap( &rBitmap )
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{
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}
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ScopedBitmapAccess( ) :
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mpAccess( nullptr ),
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mpBitmap( nullptr )
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{
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}
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// Move semantics
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ScopedBitmapAccess &operator=(ScopedBitmapAccess&&other)
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{
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mpAccess=other.mpAccess;
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mpBitmap=other.mpBitmap;
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other.mpAccess = nullptr;
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other.mpBitmap = nullptr;
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return *this;
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}
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// Disable copy from lvalue.
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ScopedBitmapAccess(const ScopedBitmapAccess&) = delete;
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ScopedBitmapAccess &operator=(const ScopedBitmapAccess&) = delete;
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~ScopedBitmapAccess() COVERITY_NOEXCEPT_FALSE
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{
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if (mpAccess)
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mpBitmap->ReleaseAccess( mpAccess );
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}
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void reset()
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{
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if (mpAccess)
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{
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mpBitmap->ReleaseAccess( mpAccess );
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mpAccess = nullptr;
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}
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}
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bool operator!() const { return !mpAccess; }
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explicit operator bool() const
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{
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return mpAccess;
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}
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Access* get() { return mpAccess; }
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const Access* get() const { return mpAccess; }
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Access* operator->() { return mpAccess; }
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const Access* operator->() const { return mpAccess; }
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Access& operator*() { return *mpAccess; }
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const Access& operator*() const { return *mpAccess; }
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private:
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Access* mpAccess;
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Bitmap* mpBitmap;
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};
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}
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#endif // INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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