diff options
Diffstat (limited to 'binfilter/bf_svtools/source/filter.vcl/igif/svt_gifread.cxx')
| -rw-r--r-- | binfilter/bf_svtools/source/filter.vcl/igif/svt_gifread.cxx | 866 |
1 files changed, 866 insertions, 0 deletions
diff --git a/binfilter/bf_svtools/source/filter.vcl/igif/svt_gifread.cxx b/binfilter/bf_svtools/source/filter.vcl/igif/svt_gifread.cxx new file mode 100644 index 000000000000..765d0dc6a992 --- /dev/null +++ b/binfilter/bf_svtools/source/filter.vcl/igif/svt_gifread.cxx @@ -0,0 +1,866 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * 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. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove + + +#define _GIFPRIVATE + +#include "decode.hxx" +#include "gifread.hxx" + +namespace binfilter +{ + +// ----------- +// - Defines - +// ----------- + +#define NO_PENDING( rStm ) ( ( rStm ).GetError() != ERRCODE_IO_PENDING ) + +// ------------- +// - GIFReader - +// ------------- + +GIFReader::GIFReader( SvStream& rStm ) : + aGPalette ( 256 ), + aLPalette ( 256 ), + rIStm ( rStm ), + pAcc8 ( NULL ), + pAcc1 ( NULL ), + nLastPos ( rStm.Tell() ), + nLogWidth100 ( 0UL ), + nLogHeight100 ( 0UL ), + nLoops ( 1 ), + eActAction ( GLOBAL_HEADER_READING ), + bGCTransparent ( FALSE ), + bImGraphicReady ( FALSE ) +{ + maUpperName = UniString::CreateFromAscii( "SVIGIF", 6 ); + pSrcBuf = new BYTE[ 256 ]; + ClearImageExtensions(); +} + +// ------------------------------------------------------------------------ + +GIFReader::~GIFReader() +{ + aImGraphic.SetContext( NULL ); + + if( pAcc1 ) + aBmp1.ReleaseAccess( pAcc1 ); + + if( pAcc8 ) + aBmp8.ReleaseAccess( pAcc8 ); + + delete[] pSrcBuf; +} + +// ------------------------------------------------------------------------ + +void GIFReader::ClearImageExtensions() +{ + nGCDisposalMethod = 0; + bGCTransparent = FALSE; + nTimer = 0; +} + +// ------------------------------------------------------------------------ + +BOOL GIFReader::CreateBitmaps( long nWidth, long nHeight, BitmapPalette* pPal, + BOOL bWatchForBackgroundColor ) +{ + const Size aSize( nWidth, nHeight ); + + if( bGCTransparent ) + { + const Color aWhite( COL_WHITE ); + + aBmp1 = Bitmap( aSize, 1 ); + + if( !aAnimation.Count() ) + aBmp1.Erase( aWhite ); + + pAcc1 = aBmp1.AcquireWriteAccess(); + + if( pAcc1 ) + { + cTransIndex1 = (BYTE) pAcc1->GetBestPaletteIndex( aWhite ); + cNonTransIndex1 = cTransIndex1 ? 0 : 1; + } + else + bStatus = FALSE; + } + + if( bStatus ) + { + aBmp8 = Bitmap( aSize, 8, pPal ); + + if( !!aBmp8 && bWatchForBackgroundColor && aAnimation.Count() ) + aBmp8.Erase( (*pPal)[ nBackgroundColor ] ); + else + aBmp8.Erase( Color( COL_WHITE ) ); + + pAcc8 = aBmp8.AcquireWriteAccess(); + bStatus = ( pAcc8 != NULL ); + } + + return bStatus; +} + +// ------------------------------------------------------------------------ + +BOOL GIFReader::ReadGlobalHeader() +{ + char pBuf[ 7 ]; + BYTE nRF; + BYTE nAspect; + BOOL bRet = FALSE; + + rIStm.Read( pBuf, 6 ); + if( NO_PENDING( rIStm ) ) + { + pBuf[ 6 ] = 0; + if( !strcmp( pBuf, "GIF87a" ) || !strcmp( pBuf, "GIF89a" ) ) + { + rIStm.Read( pBuf, 7 ); + if( NO_PENDING( rIStm ) ) + { + SvMemoryStream aMemStm; + + aMemStm.SetBuffer( pBuf, 7, FALSE, 7 ); + aMemStm >> nGlobalWidth; + aMemStm >> nGlobalHeight; + aMemStm >> nRF; + aMemStm >> nBackgroundColor; + aMemStm >> nAspect; + + bGlobalPalette = (BOOL) ( nRF & 0x80 ); + + if( bGlobalPalette ) + ReadPaletteEntries( &aGPalette, 1 << ( ( nRF & 7 ) + 1 ) ); + else + nBackgroundColor = 0; + + if( NO_PENDING( rIStm ) ) + bRet = TRUE; + } + } + else + bStatus = FALSE; + } + + return bRet; +} + +// ------------------------------------------------------------------------ + +void GIFReader::ReadPaletteEntries( BitmapPalette* pPal, ULONG nCount ) +{ + const ULONG nLen = 3UL * nCount; + BYTE* pBuf = new BYTE[ nLen ]; + + rIStm.Read( pBuf, nLen ); + if( NO_PENDING( rIStm ) ) + { + BYTE* pTmp = pBuf; + + for( ULONG i = 0UL; i < nCount; ) + { + BitmapColor& rColor = (*pPal)[ (USHORT) i++ ]; + + rColor.SetRed( *pTmp++ ); + rColor.SetGreen( *pTmp++ ); + rColor.SetBlue( *pTmp++ ); + } + + // nach Moeglichkeit noch einige Standardfarben unterbringen + if( nCount < 256UL ) + { + (*pPal)[ 255UL ] = Color( COL_WHITE ); + + if( nCount < 255UL ) + (*pPal)[ 254UL ] = Color( COL_BLACK ); + } + } + + delete[] pBuf; +} + +// ------------------------------------------------------------------------ + +BOOL GIFReader::ReadExtension() +{ + BYTE cFunction; + BYTE cSize; + BYTE cByte; + BOOL bRet = FALSE; + BOOL bOverreadDataBlocks = FALSE; + + // Extension-Label + rIStm >> cFunction; + if( NO_PENDING( rIStm ) ) + { + // Block-Laenge + rIStm >> cSize; + + switch( cFunction ) + { + // 'Graphic Control Extension' + case( 0xf9 ) : + { + BYTE cFlags; + + rIStm >> cFlags; + rIStm >> nTimer; + rIStm >> nGCTransparentIndex; + rIStm >> cByte; + + if ( NO_PENDING( rIStm ) ) + { + nGCDisposalMethod = ( cFlags >> 2) & 7; + bGCTransparent = ( cFlags & 1 ) ? TRUE : FALSE; + bStatus = ( cSize == 4 ) && ( cByte == 0 ); + bRet = TRUE; + } + } + break; + + // Application-Extension + case ( 0xff ) : + { + if ( NO_PENDING( rIStm ) ) + { + // default diese Extension ueberlesen + bOverreadDataBlocks = TRUE; + + // Appl.-Extension hat Laenge 11 + if ( cSize == 0x0b ) + { + ByteString aAppId; + ByteString aAppCode; + + rIStm.Read( aAppId.AllocBuffer( 8 ), 8 ); + rIStm.Read( aAppCode.AllocBuffer( 3 ), 3 ); + rIStm >> cSize; + + // NetScape-Extension + if( aAppId == "NETSCAPE" && aAppCode == "2.0" && cSize == 3 ) + { + rIStm >> cByte; + + // Loop-Extension + if ( cByte == 0x01 ) + { + rIStm >> cByte; + nLoops = cByte; + rIStm >> cByte; + nLoops |= ( (USHORT) cByte << 8 ); + rIStm >> cByte; + + bStatus = ( cByte == 0 ); + bRet = NO_PENDING( rIStm ); + bOverreadDataBlocks = FALSE; + + // Netscape interpretiert den LoopCount + // als reine Anzahl der _Wiederholungen_; + // bei uns ist es die Gesamtanzahl der + // Durchlaeufe + if( nLoops ) + nLoops++; + } + else + rIStm.SeekRel( -1 ); + } + else if ( aAppId == "STARDIV " && aAppCode == "5.0" && cSize == 9 ) + { + rIStm >> cByte; + + // Loop-Extension + if ( cByte == 0x01 ) + { + rIStm >> nLogWidth100 >> nLogHeight100; + rIStm >> cByte; + bStatus = ( cByte == 0 ); + bRet = NO_PENDING( rIStm ); + bOverreadDataBlocks = FALSE; + } + else + rIStm.SeekRel( -1 ); + } + + } + } + } + break; + + // alles andere ueberlesen + default: + bOverreadDataBlocks = TRUE; + break; + } + + // Sub-Blocks ueberlesen + if ( bOverreadDataBlocks ) + { + bRet = TRUE; + while( cSize && bStatus && !rIStm.IsEof() ) + { + USHORT nCount = (USHORT) cSize + 1; + char* pBuffer = new char[ nCount ]; + + bRet = FALSE; + rIStm.Read( pBuffer, nCount ); + if( NO_PENDING( rIStm ) ) + { + cSize = (BYTE) pBuffer[ cSize ]; + bRet = TRUE; + } + else + cSize = 0; + + delete[] pBuffer; + } + } + } + + return bRet; +} + +// ------------------------------------------------------------------------ + +BOOL GIFReader::ReadLocalHeader() +{ + BYTE pBuf[ 9 ]; + BOOL bRet = FALSE; + + rIStm.Read( pBuf, 9 ); + if( NO_PENDING( rIStm ) ) + { + SvMemoryStream aMemStm; + BitmapPalette* pPal; + BYTE nFlags; + + aMemStm.SetBuffer( (char*) pBuf, 9, FALSE, 9 ); + aMemStm >> nImagePosX; + aMemStm >> nImagePosY; + aMemStm >> nImageWidth; + aMemStm >> nImageHeight; + aMemStm >> nFlags; + + // Falls Interlaced, ersten Startwert vorgeben + bInterlaced = ( ( nFlags & 0x40 ) == 0x40 ); + nLastInterCount = 7; + nLastImageY = 0; + + if( nFlags & 0x80 ) + { + pPal = &aLPalette; + ReadPaletteEntries( pPal, 1 << ( (nFlags & 7 ) + 1 ) ); + } + else + pPal = &aGPalette; + + // Falls alles soweit eingelesen werden konnte, kann + // nun das lokale Bild angelegt werden; + // es wird uebergeben, ob der BackgroundColorIndex evtl. + // beruecksichtigt werden soll ( wenn Globale Farbtab. und + // diese auch fuer dieses Bild gilt ) + if( NO_PENDING( rIStm ) ) + { + CreateBitmaps( nImageWidth, nImageHeight, pPal, bGlobalPalette && ( pPal == &aGPalette ) ); + bRet = TRUE; + } + } + + return bRet; +} + +// ------------------------------------------------------------------------ + +ULONG GIFReader::ReadNextBlock() +{ + ULONG nRet = 0UL; + ULONG nRead; + BYTE cBlockSize; + + rIStm >> cBlockSize; + + if ( rIStm.IsEof() ) + nRet = 4UL; + else if ( NO_PENDING( rIStm ) ) + { + if ( cBlockSize == 0 ) + nRet = 2UL; + else + { + rIStm.Read( pSrcBuf, cBlockSize ); + + if( NO_PENDING( rIStm ) ) + { + if( bOverreadBlock ) + nRet = 3UL; + else + { + BOOL bEOI; + HPBYTE pTarget = pDecomp->DecompressBlock( pSrcBuf, cBlockSize, nRead, bEOI ); + + nRet = ( bEOI ? 3 : 1 ); + + if( nRead && !bOverreadBlock ) + FillImages( pTarget, nRead ); + + rtl_freeMemory( pTarget ); + } + } + } + } + + return nRet; +} + +// ------------------------------------------------------------------------ + +void GIFReader::FillImages( HPBYTE pBytes, ULONG nCount ) +{ + for( ULONG i = 0UL; i < nCount; i++ ) + { + if( nImageX >= nImageWidth ) + { + if( bInterlaced ) + { + long nT1, nT2; + + // falls Interlaced, werden die Zeilen kopiert + if( nLastInterCount ) + { + long nMinY = Min( (long) nLastImageY + 1, (long) nImageHeight - 1 ); + long nMaxY = Min( (long) nLastImageY + nLastInterCount, (long) nImageHeight - 1 ); + + // letzte gelesene Zeile kopieren, wenn Zeilen + // nicht zusanmmenfallen ( kommt vorm wenn wir am Ende des Bildes sind ) + if( ( nMinY > nLastImageY ) && ( nLastImageY < ( nImageHeight - 1 ) ) ) + { + HPBYTE pScanline8 = pAcc8->GetScanline( nYAcc ); + ULONG nSize8 = pAcc8->GetScanlineSize(); + HPBYTE pScanline1 = 0; + ULONG nSize1 = 0; + + if( bGCTransparent ) + { + pScanline1 = pAcc1->GetScanline( nYAcc ); + nSize1 = pAcc1->GetScanlineSize(); + } + + for( long j = nMinY; j <= nMaxY; j++ ) + { + memcpy( pAcc8->GetScanline( j ), pScanline8, nSize8 ); + + if( bGCTransparent ) + memcpy( pAcc1->GetScanline( j ), pScanline1, nSize1 ); + } + } + } + + nT1 = ( ++nImageY ) << 3; + nLastInterCount = 7; + + if( nT1 >= nImageHeight ) + { + nT2 = nImageY - ( ( nImageHeight + 7 ) >> 3 ); + nT1 = ( nT2 << 3 ) + 4; + nLastInterCount = 3; + + if( nT1 >= nImageHeight ) + { + nT2 -= ( nImageHeight + 3 ) >> 3; + nT1 = ( nT2 << 2 ) + 2; + nLastInterCount = 1; + + if( nT1 >= nImageHeight ) + { + nT2 -= ( nImageHeight + 1 ) >> 2; + nT1 = ( nT2 << 1 ) + 1; + nLastInterCount = 0; + } + } + } + + nLastImageY = (USHORT) nT1; + nYAcc = nT1; + } + else + { + nLastImageY = ++nImageY; + nYAcc = nImageY; + } + + // Zeile faengt von vorne an + nImageX = 0; + } + + if( nImageY < nImageHeight ) + { + const BYTE cTmp = pBytes[ i ]; + + if( bGCTransparent ) + { + if( cTmp == nGCTransparentIndex ) + pAcc1->SetPixel( nYAcc, nImageX++, cTransIndex1 ); + else + { + pAcc8->SetPixel( nYAcc, nImageX, cTmp ); + pAcc1->SetPixel( nYAcc, nImageX++, cNonTransIndex1 ); + } + } + else + pAcc8->SetPixel( nYAcc, nImageX++, cTmp ); + } + else + { + bOverreadBlock = TRUE; + break; + } + } +} + +// ------------------------------------------------------------------------ + +void GIFReader::CreateNewBitmaps() +{ + AnimationBitmap aAnimBmp; + + aBmp8.ReleaseAccess( pAcc8 ); + pAcc8 = NULL; + + if( bGCTransparent ) + { + aBmp1.ReleaseAccess( pAcc1 ); + pAcc1 = NULL; + aAnimBmp.aBmpEx = BitmapEx( aBmp8, aBmp1 ); + } + else + aAnimBmp.aBmpEx = BitmapEx( aBmp8 ); + + aAnimBmp.aPosPix = Point( nImagePosX, nImagePosY ); + aAnimBmp.aSizePix = Size( nImageWidth, nImageHeight ); + aAnimBmp.nWait = ( nTimer != 65535 ) ? nTimer : ANIMATION_TIMEOUT_ON_CLICK; + aAnimBmp.bUserInput = FALSE; + + if( nGCDisposalMethod == 2 ) + aAnimBmp.eDisposal = DISPOSE_BACK; + else if( nGCDisposalMethod == 3 ) + aAnimBmp.eDisposal = DISPOSE_PREVIOUS; + else + aAnimBmp.eDisposal = DISPOSE_NOT; + + aAnimation.Insert( aAnimBmp ); + + if( aAnimation.Count() == 1 ) + { + aAnimation.SetDisplaySizePixel( Size( nGlobalWidth, nGlobalHeight ) ); + aAnimation.SetLoopCount( nLoops ); + } +} + +// ------------------------------------------------------------------------ + +const Graphic& GIFReader::GetIntermediateGraphic() +{ + // Intermediate-Graphic nur erzeugen, wenn schon + // Daten vorliegen, aber die Graphic noch nicht + // vollstaendig eingelesen wurde + if ( bImGraphicReady && !aAnimation.Count() ) + { + Bitmap aBmp; + + aBmp8.ReleaseAccess( pAcc8 ); + + if ( bGCTransparent ) + { + aBmp1.ReleaseAccess( pAcc1 ); + aImGraphic = BitmapEx( aBmp8, aBmp1 ); + + pAcc1 = aBmp1.AcquireWriteAccess(); + bStatus = bStatus && ( pAcc1 != NULL ); + } + else + aImGraphic = aBmp8; + + pAcc8 = aBmp8.AcquireWriteAccess(); + bStatus = bStatus && ( pAcc8 != NULL ); + } + + return aImGraphic; +} + +// ------------------------------------------------------------------------ + +BOOL GIFReader::ProcessGIF() +{ + BOOL bRead = FALSE; + BOOL bEnd = FALSE; + + if ( !bStatus ) + eActAction = ABORT_READING; + + // Stream an die richtige Stelle bringen + rIStm.Seek( nLastPos ); + + switch( eActAction ) + { + // naechsten Marker lesen + case( MARKER_READING ): + { + BYTE cByte; + + rIStm >> cByte; + + if( rIStm.IsEof() ) + eActAction = END_READING; + else if( NO_PENDING( rIStm ) ) + { + bRead = TRUE; + + if( cByte == '!' ) + eActAction = EXTENSION_READING; + else if( cByte == ',' ) + eActAction = LOCAL_HEADER_READING; + else if( cByte == ';' ) + eActAction = END_READING; + else + eActAction = ABORT_READING; + } + } + break; + + // ScreenDescriptor lesen + case( GLOBAL_HEADER_READING ): + { + if( ( bRead = ReadGlobalHeader() ) == TRUE ) + { + ClearImageExtensions(); + eActAction = MARKER_READING; + } + } + break; + + + // Extension lesen + case( EXTENSION_READING ): + { + if( ( bRead = ReadExtension() ) == TRUE ) + eActAction = MARKER_READING; + } + break; + + + // Image-Descriptor lesen + case( LOCAL_HEADER_READING ): + { + if( ( bRead = ReadLocalHeader() ) == TRUE ) + { + nYAcc = nImageX = nImageY = 0; + eActAction = FIRST_BLOCK_READING; + } + } + break; + + + // ersten Datenblock lesen + case( FIRST_BLOCK_READING ): + { + BYTE cDataSize; + + rIStm >> cDataSize; + + if( rIStm.IsEof() ) + eActAction = ABORT_READING; + else if( cDataSize > 12 ) + bStatus = FALSE; + else if( NO_PENDING( rIStm ) ) + { + bRead = TRUE; + pDecomp = new GIFLZWDecompressor( cDataSize ); + eActAction = NEXT_BLOCK_READING; + bOverreadBlock = FALSE; + } + else + eActAction = FIRST_BLOCK_READING; + } + break; + + // naechsten Datenblock lesen + case( NEXT_BLOCK_READING ): + { + USHORT nLastX = nImageX; + USHORT nLastY = nImageY; + ULONG nRet = ReadNextBlock(); + + // Return: 0:Pending / 1:OK; / 2:OK und letzter Block: / 3:EOI / 4:HardAbort + if( nRet ) + { + bRead = TRUE; + + if ( nRet == 1UL ) + { + bImGraphicReady = TRUE; + eActAction = NEXT_BLOCK_READING; + bOverreadBlock = FALSE; + } + else + { + if( nRet == 2UL ) + { + delete pDecomp; + CreateNewBitmaps(); + eActAction = MARKER_READING; + ClearImageExtensions(); + } + else if( nRet == 3UL ) + { + eActAction = NEXT_BLOCK_READING; + bOverreadBlock = TRUE; + } + else + { + delete pDecomp; + CreateNewBitmaps(); + eActAction = ABORT_READING; + ClearImageExtensions(); + } + } + } + else + { + nImageX = nLastX; + nImageY = nLastY; + } + } + break; + + // ein Fehler trat auf + case( ABORT_READING ): + { + bEnd = TRUE; + eActAction = END_READING; + } + break; + + default: + break; + } + + // Stream an die richtige Stelle bringen, + // falls Daten gelesen werden konnten + // entweder alte Position oder aktuelle Position + if( bRead || bEnd ) + nLastPos = rIStm.Tell(); + + return bRead; +} + +// ------------------------------------------------------------------------ + +ReadState GIFReader::ReadGIF( Graphic& rGraphic ) +{ + ReadState eReadState; + + bStatus = TRUE; + + while( ProcessGIF() && ( eActAction != END_READING ) ) {} + + if( !bStatus ) + eReadState = GIFREAD_ERROR; + else if( eActAction == END_READING ) + eReadState = GIFREAD_OK; + else + { + if ( rIStm.GetError() == ERRCODE_IO_PENDING ) + rIStm.ResetError(); + + eReadState = GIFREAD_NEED_MORE; + } + + if( aAnimation.Count() == 1 ) + { + rGraphic = aAnimation.Get( 0 ).aBmpEx; + + if( nLogWidth100 && nLogHeight100 ) + { + rGraphic.SetPrefSize( Size( nLogWidth100, nLogHeight100 ) ); + rGraphic.SetPrefMapMode( MAP_100TH_MM ); + } + } + else + rGraphic = aAnimation; + + return eReadState; +} + + +// ------------- +// - ImportGIF - +// ------------- + +BOOL ImportGIF( SvStream & rStm, Graphic& rGraphic ) +{ + GIFReader* pGIFReader = (GIFReader*) rGraphic.GetContext(); + USHORT nOldFormat = rStm.GetNumberFormatInt(); + ReadState eReadState; + BOOL bRet = TRUE; + + rStm.SetNumberFormatInt( NUMBERFORMAT_INT_LITTLEENDIAN ); + + if( !pGIFReader ) + pGIFReader = new GIFReader( rStm ); + + rGraphic.SetContext( NULL ); + eReadState = pGIFReader->ReadGIF( rGraphic ); + + if( eReadState == GIFREAD_ERROR ) + { + bRet = FALSE; + delete pGIFReader; + } + else if( eReadState == GIFREAD_OK ) + delete pGIFReader; + else + { + rGraphic = pGIFReader->GetIntermediateGraphic(); + rGraphic.SetContext( pGIFReader ); + } + + rStm.SetNumberFormatInt( nOldFormat ); + + return bRet; +} + +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |