diff options
Diffstat (limited to 'vcl/source/filter/iras')
-rw-r--r-- | vcl/source/filter/iras/iras.cxx | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/vcl/source/filter/iras/iras.cxx b/vcl/source/filter/iras/iras.cxx new file mode 100644 index 000000000..49cfe2bef --- /dev/null +++ b/vcl/source/filter/iras/iras.cxx @@ -0,0 +1,414 @@ +/* -*- 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 . + */ + + +#include <vcl/graph.hxx> +#include <vcl/BitmapTools.hxx> +#include <sal/log.hxx> +#include <tools/stream.hxx> +#include <filter/RasReader.hxx> + +class FilterConfigItem; + +#define RAS_TYPE_OLD 0x00000000 // supported formats by this filter +#define RAS_TYPE_STANDARD 0x00000001 +#define RAS_TYPE_BYTE_ENCODED 0x00000002 +#define RAS_TYPE_RGB_FORMAT 0x00000003 + +#define RAS_COLOR_NO_MAP 0x00000000 +#define RAS_COLOR_RGB_MAP 0x00000001 +#define RAS_COLOR_RAW_MAP 0x00000002 + +#define SUNRASTER_MAGICNUMBER 0x59a66a95 + +//============================ RASReader ================================== + +namespace { + +class RASReader { + +private: + + SvStream& m_rRAS; // the RAS file to be read in + + bool mbStatus; + sal_Int32 mnWidth, mnHeight; // image dimensions in pixels + sal_uInt16 mnDstBitsPerPix; + sal_uInt16 mnDstColors; + sal_Int32 mnDepth, mnImageDatSize, mnType; + sal_Int32 mnColorMapType, mnColorMapSize; + sal_uInt8 mnRepCount, mnRepVal; // RLE Decoding + + bool ImplReadBody(vcl::bitmap::RawBitmap&, std::vector<Color> const & rvPalette); + bool ImplReadHeader(); + sal_uInt8 ImplGetByte(); + +public: + explicit RASReader(SvStream &rRAS); + bool ReadRAS(Graphic & rGraphic); +}; + +} + +//=================== Methods of RASReader ============================== + +RASReader::RASReader(SvStream &rRAS) + : m_rRAS(rRAS) + , mbStatus(true) + , mnWidth(0) + , mnHeight(0) + , mnDstBitsPerPix(0) + , mnDstColors(0) + , mnDepth(0) + , mnImageDatSize(0) + , mnType(0) + , mnColorMapType(0) + , mnColorMapSize(0) + , mnRepCount(0) + , mnRepVal(0) +{ +} + +bool RASReader::ReadRAS(Graphic & rGraphic) +{ + sal_uInt32 nMagicNumber; + + if ( m_rRAS.GetError() ) + return false; + + m_rRAS.SetEndian( SvStreamEndian::BIG ); + m_rRAS.ReadUInt32( nMagicNumber ); + if (!m_rRAS.good() || nMagicNumber != SUNRASTER_MAGICNUMBER) + return false; + + // Kopf einlesen: + + mbStatus = ImplReadHeader(); + if ( !mbStatus ) + return false; + + std::vector<Color> aPalette; + bool bOk = true; + + if ( mnDstBitsPerPix <= 8 ) // pallets pictures + { + bool bPalette(false); + + if ( mnColorMapType == RAS_COLOR_RAW_MAP ) // RAW color map is skipped + { + sal_uInt64 nCurPos = m_rRAS.Tell(); + bOk = checkSeek(m_rRAS, nCurPos + mnColorMapSize); + } + else if ( mnColorMapType == RAS_COLOR_RGB_MAP ) // we can read out the RGB + { + mnDstColors = static_cast<sal_uInt16>( mnColorMapSize / 3 ); + + if ( ( 1 << mnDstBitsPerPix ) < mnDstColors ) + return false; + + if ( ( mnDstColors >= 2 ) && ( ( mnColorMapSize % 3 ) == 0 ) ) + { + aPalette.resize(mnDstColors); + sal_uInt16 i; + sal_uInt8 nRed[256], nGreen[256], nBlue[256]; + for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nRed[ i ] ); + for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nGreen[ i ] ); + for ( i = 0; i < mnDstColors; i++ ) m_rRAS.ReadUChar( nBlue[ i ] ); + for ( i = 0; i < mnDstColors; i++ ) + { + aPalette[i] = Color(nRed[ i ], nGreen[ i ], nBlue[ i ]); + } + bPalette = true; + } + else + return false; + + } + else if ( mnColorMapType != RAS_COLOR_NO_MAP ) // everything else is not standard + return false; + + if (!bPalette) + { + mnDstColors = 1 << mnDstBitsPerPix; + aPalette.resize(mnDstColors); + for ( sal_uInt16 i = 0; i < mnDstColors; i++ ) + { + sal_uInt8 nCount = 255 - ( 255 * i / ( mnDstColors - 1 ) ); + aPalette[i] = Color(nCount, nCount, nCount); + } + } + } + else + { + if ( mnColorMapType != RAS_COLOR_NO_MAP ) // when graphic has more than 256 colors and a color map we skip + { // the colormap + sal_uInt64 nCurPos = m_rRAS.Tell(); + bOk = checkSeek(m_rRAS, nCurPos + mnColorMapSize); + } + } + + if (!bOk) + return false; + + //The RLE packets are typically three bytes in size: + //The first byte is a Flag Value indicating the type of RLE packet. + //The second byte is the Run Count. + //The third byte is the Run Value. + // + //for the sake of simplicity we'll assume that RAS_TYPE_BYTE_ENCODED can + //describe data 255 times larger than the data stored + size_t nMaxCompression = mnType != RAS_TYPE_BYTE_ENCODED ? 1 : 255; + sal_Int32 nBitSize; + if (o3tl::checked_multiply<sal_Int32>(mnWidth, mnHeight, nBitSize) || o3tl::checked_multiply<sal_Int32>(nBitSize, mnDepth, nBitSize)) + return false; + if (m_rRAS.remainingSize() * nMaxCompression < static_cast<sal_uInt32>(nBitSize) / 8) + return false; + + vcl::bitmap::RawBitmap aBmp(Size(mnWidth, mnHeight), 24); + + // read in the bitmap data + mbStatus = ImplReadBody(aBmp, aPalette); + + if ( mbStatus ) + rGraphic = vcl::bitmap::CreateFromData(std::move(aBmp)); + + return mbStatus; +} + +bool RASReader::ImplReadHeader() +{ + m_rRAS.ReadInt32(mnWidth).ReadInt32(mnHeight).ReadInt32(mnDepth).ReadInt32(mnImageDatSize).ReadInt32(mnType).ReadInt32(mnColorMapType).ReadInt32(mnColorMapSize); + + if (!m_rRAS.good() || mnWidth <= 0 || mnHeight <= 0 || mnImageDatSize <= 0) + mbStatus = false; + + switch ( mnDepth ) + { + case 24 : + case 8 : + case 1 : + mnDstBitsPerPix = static_cast<sal_uInt16>(mnDepth); + break; + case 32 : + mnDstBitsPerPix = 24; + break; + + default : + mbStatus = false; + } + + switch ( mnType ) + { + case RAS_TYPE_OLD : + case RAS_TYPE_STANDARD : + case RAS_TYPE_RGB_FORMAT : + case RAS_TYPE_BYTE_ENCODED : // this type will be supported later + break; + + default: + mbStatus = false; + } + return mbStatus; +} + +namespace +{ + const Color& SanitizePaletteIndex(std::vector<Color> const & rvPalette, sal_uInt8 nIndex) + { + if (nIndex >= rvPalette.size()) + { + auto nSanitizedIndex = nIndex % rvPalette.size(); + SAL_WARN_IF(nIndex != nSanitizedIndex, "filter.ras", "invalid colormap index: " + << static_cast<unsigned int>(nIndex) << ", colormap len is: " + << rvPalette.size()); + nIndex = nSanitizedIndex; + } + return rvPalette[nIndex]; + } +} + +bool RASReader::ImplReadBody(vcl::bitmap::RawBitmap& rBitmap, std::vector<Color> const & rvPalette) +{ + sal_Int32 x, y; + sal_uInt8 nRed, nGreen, nBlue; + switch ( mnDstBitsPerPix ) + { + case 1 : + { + sal_uInt8 nDat = 0; + for (y = 0; y < mnHeight && mbStatus; ++y) + { + for (x = 0; x < mnWidth && mbStatus; ++x) + { + if (!(x & 7)) + { + nDat = ImplGetByte(); + if (!m_rRAS.good()) + mbStatus = false; + } + rBitmap.SetPixel(y, x, SanitizePaletteIndex(rvPalette, + sal::static_int_cast< sal_uInt8 >( + nDat >> ( ( x & 7 ) ^ 7 )))); + } + if (!( ( x - 1 ) & 0x8 ) ) + { + ImplGetByte(); // WORD ALIGNMENT ??? + if (!m_rRAS.good()) + mbStatus = false; + } + } + break; + } + + case 8 : + for (y = 0; y < mnHeight && mbStatus; ++y) + { + for (x = 0; x < mnWidth && mbStatus; ++x) + { + sal_uInt8 nDat = ImplGetByte(); + rBitmap.SetPixel(y, x, SanitizePaletteIndex(rvPalette, nDat)); + if (!m_rRAS.good()) + mbStatus = false; + } + if ( x & 1 ) + { + ImplGetByte(); // WORD ALIGNMENT ??? + if (!m_rRAS.good()) + mbStatus = false; + } + } + break; + + case 24 : + switch ( mnDepth ) + { + + case 24 : + for (y = 0; y < mnHeight && mbStatus; ++y) + { + for (x = 0; x < mnWidth && mbStatus; ++x) + { + if ( mnType == RAS_TYPE_RGB_FORMAT ) + { + nRed = ImplGetByte(); + nGreen = ImplGetByte(); + nBlue = ImplGetByte(); + } + else + { + nBlue = ImplGetByte(); + nGreen = ImplGetByte(); + nRed = ImplGetByte(); + } + rBitmap.SetPixel(y, x, Color(nRed, nGreen, nBlue)); + if (!m_rRAS.good()) + mbStatus = false; + } + if ( x & 1 ) + { + ImplGetByte(); // WORD ALIGNMENT ??? + if (!m_rRAS.good()) + mbStatus = false; + } + } + break; + + case 32 : + for (y = 0; y < mnHeight && mbStatus; ++y) + { + for (x = 0; x < mnWidth && mbStatus; ++x) + { + ImplGetByte(); // pad byte > nil + if ( mnType == RAS_TYPE_RGB_FORMAT ) + { + nRed = ImplGetByte(); + nGreen = ImplGetByte(); + nBlue = ImplGetByte(); + } + else + { + nBlue = ImplGetByte(); + nGreen = ImplGetByte(); + nRed = ImplGetByte(); + } + rBitmap.SetPixel(y, x, Color(nRed, nGreen, nBlue)); + if (!m_rRAS.good()) + mbStatus = false; + } + } + break; + } + break; + + default: + mbStatus = false; + break; + } + return mbStatus; +} + +sal_uInt8 RASReader::ImplGetByte() +{ + sal_uInt8 nRetVal(0); + if ( mnType != RAS_TYPE_BYTE_ENCODED ) + { + m_rRAS.ReadUChar( nRetVal ); + return nRetVal; + } + else + { + if ( mnRepCount ) + { + mnRepCount--; + return mnRepVal; + } + else + { + m_rRAS.ReadUChar( nRetVal ); + if ( nRetVal != 0x80 ) + return nRetVal; + m_rRAS.ReadUChar( nRetVal ); + if ( nRetVal == 0 ) + return 0x80; + mnRepCount = nRetVal ; + m_rRAS.ReadUChar( mnRepVal ); + return mnRepVal; + } + } +} + +//================== GraphicImport - the exported function ================ + +bool ImportRasGraphic( SvStream & rStream, Graphic & rGraphic) +{ + bool bRet = false; + + try + { + RASReader aRASReader(rStream); + bRet = aRASReader.ReadRAS(rGraphic ); + } + catch (...) + { + } + + return bRet; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |