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diff --git a/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx b/sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
+#define SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
+
+#include <sal/types.h>
+#include <tools/gen.hxx>
+#include <boost/shared_ptr.hpp>
+
+
+class Bitmap;
+
+namespace sd { namespace slidesorter { namespace cache {
+
+class BitmapReplacement;
+
+
+/** This interface class provides the minimal method set for classes that
+    implement the compression and decompression of preview bitmaps.
+*/
+class BitmapCompressor
+{
+public:
+    /** Compress the given bitmap into a replacement format that is specific
+        to the compressor class.
+    */
+    virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const = 0;
+
+    /** Decompress the given replacement data into a preview bitmap.
+        Depending on the compression technique the returned bitmap may
+        differ from the original bitmap given to the Compress() method.  It
+        may even of the wrong size or empty or the NULL pointer.  It is the
+        task of the caller to create a new preview bitmap if the returned
+        one is not as desired.
+    */
+    virtual Bitmap Decompress (const BitmapReplacement& rBitmapData)const=0;
+
+    /** Return whether the compression and decompression is lossless.  This
+        value is used by the caller of Decompress() to decide whether to use
+        the returned bitmap as is or if a new preview has to be created.
+    */
+    virtual bool IsLossless (void) const = 0;
+};
+
+
+
+/** Interface for preview bitmap replacements.  Each bitmap
+    compressor/decompressor has to provide an implementation that is
+    suitable to store the compressed bitmaps.
+*/
+class BitmapReplacement
+{
+public:
+    virtual sal_Int32 GetMemorySize (void) const { return 0; }
+};
+
+
+
+
+/** This is one trivial bitmap compressor.  It stores bitmaps unmodified
+    instead of compressing them.
+    This compressor is lossless.
+*/
+class NoBitmapCompression
+    : public BitmapCompressor
+{
+    class DummyReplacement;
+public:
+    virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rpBitmap) const;
+    virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
+    virtual bool IsLossless (void) const;
+};
+
+
+
+
+/** This is another trivial bitmap compressor.  Instead of compressing a
+    bitmap, it throws the bitmap away.  Its Decompress() method returns a
+    NULL pointer.  The caller has to create a new preview bitmap instead.
+    This compressor clearly is not lossless.
+*/
+class CompressionByDeletion
+    : public BitmapCompressor
+{
+public:
+    virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const;
+    virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
+    virtual bool IsLossless (void) const;
+};
+
+
+
+
+/** Compress a preview bitmap by reducing its resolution.  While the aspect
+    ratio is maintained the horizontal resolution is scaled down to 100
+    pixels.
+    This compressor is not lossless.
+*/
+class ResolutionReduction
+    : public BitmapCompressor
+{
+    class ResolutionReducedReplacement;
+    static const sal_Int32 mnWidth = 100;
+public:
+    virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rpBitmap) const;
+    /** Scale the replacement bitmap up to the original size.
+    */
+    virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
+    virtual bool IsLossless (void) const;
+};
+
+
+
+
+/** Compress preview bitmaps using the PNG format.
+    This compressor is lossless.
+*/
+class PngCompression
+    : public BitmapCompressor
+{
+    class PngReplacement;
+public:
+    virtual ::boost::shared_ptr<BitmapReplacement> Compress (const Bitmap& rBitmap) const;
+    virtual Bitmap Decompress (const BitmapReplacement& rBitmapData) const;
+    virtual bool IsLossless (void) const;
+};
+
+
+} } } // end of namespace ::sd::slidesorter::cache
+
+#endif