INTEGRATION: CWS impress69 (1.1.2); FILE ADDED
2005/09/21 15:06:14 af 1.1.2.1: #i54916# Initial revision.
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sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
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sd/source/ui/slidesorter/cache/SlsBitmapCompressor.hxx
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/*************************************************************************
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*
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* $RCSfile: SlsBitmapCompressor.hxx,v $
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*
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* $Revision: 1.2 $
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*
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* last change: $Author: rt $ $Date: 2005-10-24 07:39:39 $
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*
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* The Contents of this file are made available subject to the terms of
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* either of the following licenses
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*
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* - GNU Lesser General Public License Version 2.1
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* - Sun Industry Standards Source License Version 1.1
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*
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* Sun Microsystems Inc., October, 2000
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2000 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*
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* Sun Industry Standards Source License Version 1.1
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* =================================================
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* The contents of this file are subject to the Sun Industry Standards
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* Source License Version 1.1 (the "License"); You may not use this file
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* except in compliance with the License. You may obtain a copy of the
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* License at http://www.openoffice.org/license.html.
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*
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* Software provided under this License is provided on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
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* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
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* See the License for the specific provisions governing your rights and
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* obligations concerning the Software.
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*
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* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
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*
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* Copyright: 2000 by Sun Microsystems, Inc.
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*
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* All Rights Reserved.
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*
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* Contributor(s): _______________________________________
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*
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*
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************************************************************************/
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#ifndef SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
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#define SD_SLIDESORTER_BITMAP_COMPRESSOR_HXX
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#include <sal/types.h>
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#include <tools/gen.hxx>
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#include <boost/shared_ptr.hpp>
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class BitmapEx;
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namespace sd { namespace slidesorter { namespace cache {
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class BitmapReplacement;
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/** This interface class provides the minimal method set for classes that
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implement the compression and decompression of preview bitmaps.
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*/
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class BitmapCompressor
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{
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public:
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/** Compress the given bitmap into a replacement format that is specific
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to the compressor class.
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*/
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virtual ::boost::shared_ptr<BitmapReplacement> Compress (
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const ::boost::shared_ptr<BitmapEx>& rpBitmap) const = 0;
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/** Decompress the given replacement data into a preview bitmap.
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Depending on the compression technique the returned bitmap may
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differ from the original bitmap given to the Compress() method. It
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may even of the wrong size or empty or the NULL pointer. It is the
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task of the caller to create a new preview bitmap if the returned
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one is not as desired.
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*/
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virtual ::boost::shared_ptr<BitmapEx> Decompress (const BitmapReplacement& rBitmapData)const=0;
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/** Return whether the compression and decompression is lossless. This
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value is used by the caller of Decompress() to decide whether to use
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the returned bitmap as is or if a new preview has to be created.
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*/
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virtual bool IsLossless (void) const = 0;
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};
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/** Interface for preview bitmap replacements. Each bitmap
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compressor/decompressor has to provide an implementation that is
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suitable to store the compressed bitmaps.
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*/
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class BitmapReplacement
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{
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public:
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virtual sal_Int32 GetMemorySize (void) const { return 0; }
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};
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/** This is one trivial bitmap compressor. It stores bitmaps unmodified
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instead of compressing them.
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This compressor is lossless.
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*/
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class NoBitmapCompression
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: public BitmapCompressor
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{
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class DummyReplacement;
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public:
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virtual ::boost::shared_ptr<BitmapReplacement> Compress (
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const ::boost::shared_ptr<BitmapEx>& rpBitmap) const;
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virtual ::boost::shared_ptr<BitmapEx> Decompress (const BitmapReplacement& rBitmapData) const;
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virtual bool IsLossless (void) const;
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};
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/** This is another trivial bitmap compressor. Instead of compressing a
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bitmap, it throws the bitmap away. Its Decompress() method returns a
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NULL pointer. The caller has to create a new preview bitmap instead.
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This compressor clearly is not lossless.
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*/
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class CompressionByDeletion
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: public BitmapCompressor
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{
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public:
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virtual ::boost::shared_ptr<BitmapReplacement> Compress (
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const ::boost::shared_ptr<BitmapEx>& rpBitmap) const;
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virtual ::boost::shared_ptr<BitmapEx> Decompress (const BitmapReplacement& rBitmapData) const;
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virtual bool IsLossless (void) const;
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};
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/** Compress a preview bitmap by reducing its resolution. While the aspect
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ratio is maintained the horizontal resolution is scaled down to 100
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pixels.
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This compressor is not lossless.
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*/
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class ResolutionReduction
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: public BitmapCompressor
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{
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class ResolutionReducedReplacement;
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static const sal_Int32 mnWidth = 100;
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public:
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virtual ::boost::shared_ptr<BitmapReplacement> Compress (
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const ::boost::shared_ptr<BitmapEx>& rpBitmap) const;
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/** Scale the replacement bitmap up to the original size.
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*/
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virtual ::boost::shared_ptr<BitmapEx> Decompress (const BitmapReplacement& rBitmapData) const;
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virtual bool IsLossless (void) const;
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};
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/** Compress preview bitmaps using the PNG format.
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This compressor is lossless.
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*/
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class PngCompression
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: public BitmapCompressor
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{
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class PngReplacement;
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public:
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virtual ::boost::shared_ptr<BitmapReplacement> Compress (
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const ::boost::shared_ptr<BitmapEx>& rpBitmap) const;
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virtual ::boost::shared_ptr<BitmapEx> Decompress (const BitmapReplacement& rBitmapData) const;
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virtual bool IsLossless (void) const;
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};
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} } } // end of namespace ::sd::slidesorter::cache
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#endif
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