diff options
Diffstat (limited to 'goodies/source/filter.vcl/egif/giflzwc.cxx')
| -rw-r--r-- | goodies/source/filter.vcl/egif/giflzwc.cxx | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/goodies/source/filter.vcl/egif/giflzwc.cxx b/goodies/source/filter.vcl/egif/giflzwc.cxx new file mode 100644 index 000000000000..29c3a7735d27 --- /dev/null +++ b/goodies/source/filter.vcl/egif/giflzwc.cxx @@ -0,0 +1,287 @@ +/************************************************************************* + * + * $RCSfile: giflzwc.cxx,v $ + * + * $Revision: 1.1.1.1 $ + * + * last change: $Author: hr $ $Date: 2000-09-18 16:30:11 $ + * + * The Contents of this file are made available subject to the terms of + * either of the following licenses + * + * - GNU Lesser General Public License Version 2.1 + * - Sun Industry Standards Source License Version 1.1 + * + * Sun Microsystems Inc., October, 2000 + * + * GNU Lesser General Public License Version 2.1 + * ============================================= + * Copyright 2000 by Sun Microsystems, Inc. + * 901 San Antonio Road, Palo Alto, CA 94303, USA + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software Foundation. + * + * This library 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 for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + * + * + * Sun Industry Standards Source License Version 1.1 + * ================================================= + * The contents of this file are subject to the Sun Industry Standards + * Source License Version 1.1 (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.openoffice.org/license.html. + * + * Software provided under this License is provided on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, + * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS, + * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING. + * See the License for the specific provisions governing your rights and + * obligations concerning the Software. + * + * The Initial Developer of the Original Code is: Sun Microsystems, Inc. + * + * Copyright: 2000 by Sun Microsystems, Inc. + * + * All Rights Reserved. + * + * Contributor(s): _______________________________________ + * + * + ************************************************************************/ + +#include <tools/stream.hxx> +#include "giflzwc.hxx" + +// ---------------------------- +// - GIFImageDataOutputStream - +// ---------------------------- + +class GIFImageDataOutputStream +{ +private: + + void FlushBlockBuf(); + inline void FlushBitsBufsFullBytes(); + + SvStream& rStream; + BYTE* pBlockBuf; + BYTE nBlockBufSize; + ULONG nBitsBuf; + USHORT nBitsBufSize; + +public: + + GIFImageDataOutputStream( SvStream & rGIF, BYTE nLZWDataSize ); + ~GIFImageDataOutputStream(); + + inline void WriteBits( USHORT nCode, USHORT nCodeLen ); +}; + +// ------------------------------------------------------------------------ + +inline void GIFImageDataOutputStream::FlushBitsBufsFullBytes() +{ + while (nBitsBufSize>=8) + { + if( nBlockBufSize==255 ) + FlushBlockBuf(); + + pBlockBuf[nBlockBufSize++] = (BYTE) nBitsBuf; + nBitsBuf >>= 8; + nBitsBufSize -= 8; + } +} + +// ------------------------------------------------------------------------ + +inline void GIFImageDataOutputStream::WriteBits( USHORT nCode, USHORT nCodeLen ) +{ + if( nBitsBufSize+nCodeLen>32 ) + FlushBitsBufsFullBytes(); + + nBitsBuf |= (ULONG) nCode << nBitsBufSize; + nBitsBufSize += nCodeLen; +} + +// ------------------------------------------------------------------------ + +GIFImageDataOutputStream::GIFImageDataOutputStream( SvStream & rGIF, BYTE nLZWDataSize ) : + rStream(rGIF) +{ + pBlockBuf = new BYTE[ 255 ]; + nBlockBufSize = 0; + nBitsBufSize = 0; + nBitsBuf = 0; + rStream << nLZWDataSize; +} + +// ------------------------------------------------------------------------ + + +GIFImageDataOutputStream::~GIFImageDataOutputStream() +{ + WriteBits(0,7); + FlushBitsBufsFullBytes(); + FlushBlockBuf(); + rStream << (BYTE)0; + delete[] pBlockBuf; +} + +// ------------------------------------------------------------------------ + +void GIFImageDataOutputStream::FlushBlockBuf() +{ + if( nBlockBufSize ) + { + rStream << (BYTE) nBlockBufSize; + rStream.Write( pBlockBuf,nBlockBufSize ); + nBlockBufSize = 0; + } +} + +// ------------------- +// - GIFLZWCTreeNode - +// ------------------- + +struct GIFLZWCTreeNode +{ + + GIFLZWCTreeNode* pBrother; // naechster Knoten, der den selben Vater hat + GIFLZWCTreeNode* pFirstChild; // erster Sohn + USHORT nCode; // Der Code fuer den String von Pixelwerten, der sich ergibt, wenn + USHORT nValue; // Der Pixelwert +}; + +// -------------------- +// - GIFLZWCompressor - +// -------------------- + +GIFLZWCompressor::GIFLZWCompressor() +{ + pIDOS=NULL; +} + +// ------------------------------------------------------------------------ + +GIFLZWCompressor::~GIFLZWCompressor() +{ + if (pIDOS!=NULL) EndCompression(); +} + +// ------------------------------------------------------------------------ + +void GIFLZWCompressor::StartCompression( SvStream& rGIF, USHORT nPixelSize ) +{ + if( !pIDOS ) + { + USHORT i; + + nDataSize = nPixelSize; + + if( nDataSize < 2 ) + nDataSize=2; + + nClearCode=1<<nDataSize; + nEOICode=nClearCode+1; + nTableSize=nEOICode+1; + nCodeSize=nDataSize+1; + + pIDOS=new GIFImageDataOutputStream(rGIF,(BYTE)nDataSize); + pTable=new GIFLZWCTreeNode[4096]; + + for (i=0; i<4096; i++) + { + pTable[i].pBrother = pTable[i].pFirstChild = NULL; + pTable[i].nValue = (BYTE) ( pTable[i].nCode = i ); + } + + pPrefix = NULL; + pIDOS->WriteBits( nClearCode,nCodeSize ); + } +} + +// ------------------------------------------------------------------------ + +void GIFLZWCompressor::Compress( HPBYTE pSrc, ULONG nSize ) +{ + if( pIDOS ) + { + GIFLZWCTreeNode* p; + USHORT i; + BYTE nV; + + if( !pPrefix && nSize ) + { + pPrefix=pTable+(*pSrc++); + nSize--; + } + + while( nSize ) + { + nSize--; + nV=*pSrc++; + for( p=pPrefix->pFirstChild; p!=NULL; p=p->pBrother ) + { + if (p->nValue==nV) + break; + } + + if( p) + pPrefix=p; + else + { + pIDOS->WriteBits(pPrefix->nCode,nCodeSize); + + if (nTableSize==4096) + { + pIDOS->WriteBits(nClearCode,nCodeSize); + + for (i=0; i<nClearCode; i++) + pTable[i].pFirstChild=NULL; + + nCodeSize=nDataSize+1; + nTableSize=nEOICode+1; + } + else + { + if(nTableSize==(USHORT)(1<<nCodeSize)) + nCodeSize++; + + p=pTable+(nTableSize++); + p->pBrother=pPrefix->pFirstChild; + pPrefix->pFirstChild=p; + p->nValue=nV; + p->pFirstChild=NULL; + } + + pPrefix=pTable+nV; + } + } + } +} + +// ------------------------------------------------------------------------ + +void GIFLZWCompressor::EndCompression() +{ + if( pIDOS ) + { + if( pPrefix ) + pIDOS->WriteBits(pPrefix->nCode,nCodeSize); + + pIDOS->WriteBits( nEOICode,nCodeSize ); + delete[] pTable; + delete pIDOS; + pIDOS=NULL; + } +} |