1 files changed, 129 insertions, 0 deletions
diff --git a/vcl/inc/regband.hxx b/vcl/inc/regband.hxx
new file mode 100644
index 000000000..c7b9e6119
--- /dev/null
+++ b/vcl/inc/regband.hxx
@@ -0,0 +1,129 @@
+/* -*- 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_INC_REGBAND_HXX
+#define INCLUDED_VCL_INC_REGBAND_HXX
+
+/*
+
+class ImplRegionBand
+
+This class handles one y-band of the region. In this band may contain one
+or more separations in x-direction. The y-Band do not contain any
+separation after creation.
+
+The separations are modified with basic clipping functions like Union and
+Intersection - the Class will process the clipping for the actual band.
+
+*/
+
+// element for the list with x-separations
+struct ImplRegionBandSep
+{
+    ImplRegionBandSep*          mpNextSep;
+    long                        mnXLeft;
+    long                        mnXRight;
+    bool                        mbRemoved;
+};
+
+enum class LineType { Ascending, Descending };
+
+// element for the list with x-separations
+struct ImplRegionBandPoint
+{
+    ImplRegionBandPoint*        mpNextBandPoint;
+    long                        mnX;
+    long                        mnLineId;
+    bool                        mbEndPoint;
+    LineType                    meLineType;
+};
+
+class ImplRegionBand
+{
+public:
+    ImplRegionBand*             mpNextBand;         // pointer to the next element of the list
+    ImplRegionBand*             mpPrevBand;         // pointer to the previous element of the list (only used temporarily)
+    ImplRegionBandSep*          mpFirstSep;         // root of the list with x-separations
+    ImplRegionBandPoint*        mpFirstBandPoint;   // root of the list with lines
+    long                        mnYTop;             // actual boundary of the band
+    long                        mnYBottom;
+
+    bool                        mbTouched : 1;
+
+                                // create y-band with boundaries
+                                ImplRegionBand( long nYTop, long nYBottom );
+                                /** copy y-band with all data
+                                    @param theSourceBand
+                                        The new ImplRegionBand object will
+                                        be a copy of this band.
+                                    @param bIgnorePoints
+                                        When true (the default) the
+                                        band points pointed to by
+                                        mpFirstBandPoint are not copied.
+                                        When false they are copied.
+                                        You need the points when you are
+                                        planning to call ProcessPoints()
+                                        later on.
+                                */
+                                ImplRegionBand( const ImplRegionBand & theSourceBand,
+                                                const bool bIgnorePoints = true);
+                                ~ImplRegionBand();
+
+    long                        GetXLeftBoundary() const;
+    long                        GetXRightBoundary() const;
+
+                                // combine overlapping bands
+    void                        OptimizeBand();
+
+                                // generate separations from lines and process
+                                // union with existing separations
+    void                        ProcessPoints();
+                                // insert point in the list for later processing
+    bool                        InsertPoint( long nX, long nLineID,
+                                             bool bEndPoint, LineType eLineType );
+
+    void                        Union( long nXLeft, long nXRight );
+    void                        Intersect( long nXLeft, long nXRight );
+    void                        Exclude( long nXLeft, long nXRight );
+    void                        XOr( long nXLeft, long nXRight );
+
+    void                        MoveX( long nHorzMove );
+    void                        ScaleX( double fHorzScale );
+
+    bool                        IsInside( long nX );
+
+    bool                        IsEmpty() const { return ((!mpFirstSep) && (!mpFirstBandPoint)); }
+
+    bool                        operator==( const ImplRegionBand& rRegionBand ) const;
+
+    /** Split the called band at the given vertical coordinate.  After the
+        split the called band will cover the upper part not including nY.
+        The new band will cover the lower part including nY.
+        @param nY
+            The band is split at this y coordinate.  The new, lower band
+            will include this very value.
+        @return
+            Returns the new, lower band.
+    */
+    ImplRegionBand*             SplitBand (const sal_Int32 nY);
+};
+
+#endif // INCLUDED_VCL_INC_REGBAND_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */