1 files changed, 162 insertions, 0 deletions
diff --git a/sc/source/ui/view/invmerge.cxx b/sc/source/ui/view/invmerge.cxx
new file mode 100644
index 000000000..a08222197
--- /dev/null
+++ b/sc/source/ui/view/invmerge.cxx
@@ -0,0 +1,162 @@
+/* -*- 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 .
+ */
+
+#include <osl/diagnose.h>
+
+#include <invmerge.hxx>
+
+ScInvertMerger::ScInvertMerger( ::std::vector< tools::Rectangle >* pRectangles ) :
+    pRects( pRectangles )
+{
+    //  collect rectangles instead of inverting
+}
+
+ScInvertMerger::~ScInvertMerger()
+{
+    Flush();
+}
+
+void ScInvertMerger::Flush()
+{
+    FlushLine();
+    FlushTotal();
+
+    OSL_ENSURE( aLineRect.IsEmpty() && aTotalRect.IsEmpty(), "Flush: not empty" );
+
+    if ( !pRects )
+        return;
+
+    // also join vertically if there are non-adjacent columns involved
+
+    size_t nComparePos = 0;
+    while ( nComparePos < pRects->size() )
+    {
+        tools::Rectangle aCompRect = (*pRects)[nComparePos];
+        sal_Int32 nBottom = aCompRect.Bottom();
+        size_t nOtherPos = nComparePos + 1;
+
+        while ( nOtherPos < pRects->size() )
+        {
+            tools::Rectangle aOtherRect = (*pRects)[nOtherPos];
+            if ( aOtherRect.Top() > nBottom + 1 )
+            {
+                // rectangles are sorted, so we can stop searching
+                break;
+            }
+            if ( aOtherRect.Top() == nBottom + 1 &&
+                 aOtherRect.Left() == aCompRect.Left() &&
+                 aOtherRect.Right() == aCompRect.Right() )
+            {
+                // extend first rectangle
+                nBottom = aOtherRect.Bottom();
+                aCompRect.SetBottom( nBottom );
+                (*pRects)[nComparePos].SetBottom( nBottom );
+
+                // remove second rectangle
+                pRects->erase( pRects->begin() + nOtherPos );
+
+                // continue at unmodified nOtherPos
+            }
+            else
+                ++nOtherPos;
+        }
+
+        ++nComparePos;
+    }
+}
+
+void ScInvertMerger::FlushTotal()
+{
+    if( aTotalRect.IsEmpty() )
+        return;                         // nothing to do
+
+    if ( pRects )
+        pRects->push_back( aTotalRect );
+
+    aTotalRect.SetEmpty();
+}
+
+void ScInvertMerger::FlushLine()
+{
+    if( aLineRect.IsEmpty() )
+        return;                         // nothing to do
+
+    if ( aTotalRect.IsEmpty() )
+    {
+        aTotalRect = aLineRect;         // start new total rect
+    }
+    else
+    {
+        if ( aLineRect.Left()  == aTotalRect.Left()  &&
+             aLineRect.Right() == aTotalRect.Right() &&
+             aLineRect.Top()   == aTotalRect.Bottom() + 1 )
+        {
+            // extend total rect
+            aTotalRect.SetBottom( aLineRect.Bottom() );
+        }
+        else
+        {
+            FlushTotal();                   // draw old total rect
+            aTotalRect = aLineRect;         // and start new one
+        }
+    }
+
+    aLineRect.SetEmpty();
+}
+
+void ScInvertMerger::AddRect( const tools::Rectangle& rRect )
+{
+    tools::Rectangle aJustified = rRect;
+    if ( rRect.Left() > rRect.Right() )     // switch for RTL layout
+    {
+        aJustified.SetLeft( rRect.Right() );
+        aJustified.SetRight( rRect.Left() );
+    }
+
+    if ( aLineRect.IsEmpty() )
+    {
+        aLineRect = aJustified;             // start new line rect
+    }
+    else
+    {
+        bool bDone = false;
+        if ( aJustified.Top()    == aLineRect.Top()    &&
+             aJustified.Bottom() == aLineRect.Bottom() )
+        {
+            // try to extend line rect
+            if ( aJustified.Left() == aLineRect.Right() + 1 )
+            {
+                aLineRect.SetRight( aJustified.Right() );
+                bDone = true;
+            }
+            else if ( aJustified.Right() + 1 == aLineRect.Left() )  // for RTL layout
+            {
+                aLineRect.SetLeft( aJustified.Left() );
+                bDone = true;
+            }
+        }
+        if (!bDone)
+        {
+            FlushLine();                // use old line rect for total rect
+            aLineRect = aJustified;     // and start new one
+        }
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */