Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 123 insertions, 0 deletions

diff --git a/include/vcl/scopedbitmapaccess.hxx b/include/vcl/scopedbitmapaccess.hxx
new file mode 100644
index 000000000..b06618091
--- /dev/null
+++ b/include/vcl/scopedbitmapaccess.hxx
@@ -0,0 +1,123 @@
+/* -*- 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
+
+#include <sal/types.h>
+
+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;
+    BitmapScopedWriteAccess 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
+{
+public:
+    explicit ScopedBitmapAccess( Bitmap& rBitmap ) :
+        mpAccess( nullptr ),
+        mpBitmap( &rBitmap )
+    {
+        mpAccess = (mpBitmap->*Acquire)();
+    }
+
+    ScopedBitmapAccess( Access* pAccess, Bitmap& rBitmap ) :
+        mpAccess( pAccess ),
+        mpBitmap( &rBitmap )
+    {
+    }
+
+    ScopedBitmapAccess( ) :
+        mpAccess( nullptr ),
+        mpBitmap( nullptr )
+    {
+    }
+
+    // Move semantics
+    ScopedBitmapAccess &operator=(ScopedBitmapAccess&&other)
+    {
+        mpAccess=other.mpAccess;
+        mpBitmap=other.mpBitmap;
+        other.mpAccess = nullptr;
+        other.mpBitmap = nullptr;
+        return *this;
+     }
+
+    // Disable copy from lvalue.
+    ScopedBitmapAccess(const ScopedBitmapAccess&) = delete;
+    ScopedBitmapAccess &operator=(const ScopedBitmapAccess&) = delete;
+
+    ~ScopedBitmapAccess() COVERITY_NOEXCEPT_FALSE
+    {
+        if (mpAccess)
+           mpBitmap->ReleaseAccess( mpAccess );
+    }
+
+    void reset()
+    {
+        if (mpAccess)
+        {
+           mpBitmap->ReleaseAccess( mpAccess );
+           mpAccess = nullptr;
+        }
+    }
+
+    bool operator!() const { return !mpAccess; }
+    explicit operator bool() const
+    {
+        return mpAccess;
+    }
+
+    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*     mpBitmap;
+};
+
+}
+
+#endif // INCLUDED_VCL_SCOPEDBITMAPACCESS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */