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-rw-r--r--vcl/source/bitmap/dibtools.cxx1873
1 files changed, 1873 insertions, 0 deletions
diff --git a/vcl/source/bitmap/dibtools.cxx b/vcl/source/bitmap/dibtools.cxx
new file mode 100644
index 000000000..96b82b9a7
--- /dev/null
+++ b/vcl/source/bitmap/dibtools.cxx
@@ -0,0 +1,1873 @@
+/* -*- 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 <sal/config.h>
+#include <sal/log.hxx>
+
+#include <cassert>
+
+#include <o3tl/safeint.hxx>
+#include <vcl/dibtools.hxx>
+#include <comphelper/fileformat.h>
+#include <tools/zcodec.hxx>
+#include <tools/stream.hxx>
+#include <tools/fract.hxx>
+#include <tools/helpers.hxx>
+#include <tools/GenericTypeSerializer.hxx>
+#include <unotools/configmgr.hxx>
+#include <vcl/bitmapex.hxx>
+#include <vcl/outdev.hxx>
+#include <bitmap/BitmapWriteAccess.hxx>
+#include <memory>
+
+#define DIBCOREHEADERSIZE ( 12UL )
+#define DIBINFOHEADERSIZE ( sizeof(DIBInfoHeader) )
+#define DIBV5HEADERSIZE ( sizeof(DIBV5Header) )
+
+// - DIBInfoHeader and DIBV5Header
+
+typedef sal_Int32 FXPT2DOT30;
+
+namespace
+{
+
+struct CIEXYZ
+{
+ FXPT2DOT30 aXyzX;
+ FXPT2DOT30 aXyzY;
+ FXPT2DOT30 aXyzZ;
+
+ CIEXYZ()
+ : aXyzX(0),
+ aXyzY(0),
+ aXyzZ(0)
+ {}
+};
+
+struct CIEXYZTriple
+{
+ CIEXYZ aXyzRed;
+ CIEXYZ aXyzGreen;
+ CIEXYZ aXyzBlue;
+
+ CIEXYZTriple()
+ {}
+};
+
+struct DIBInfoHeader
+{
+ sal_uInt32 nSize;
+ sal_Int32 nWidth;
+ sal_Int32 nHeight;
+ sal_uInt16 nPlanes;
+ sal_uInt16 nBitCount;
+ sal_uInt32 nCompression;
+ sal_uInt32 nSizeImage;
+ sal_Int32 nXPelsPerMeter;
+ sal_Int32 nYPelsPerMeter;
+ sal_uInt32 nColsUsed;
+ sal_uInt32 nColsImportant;
+
+ DIBInfoHeader()
+ : nSize(0),
+ nWidth(0),
+ nHeight(0),
+ nPlanes(0),
+ nBitCount(0),
+ nCompression(0),
+ nSizeImage(0),
+ nXPelsPerMeter(0),
+ nYPelsPerMeter(0),
+ nColsUsed(0),
+ nColsImportant(0)
+ {}
+};
+
+struct DIBV5Header : public DIBInfoHeader
+{
+ sal_uInt32 nV5RedMask;
+ sal_uInt32 nV5GreenMask;
+ sal_uInt32 nV5BlueMask;
+ sal_uInt32 nV5AlphaMask;
+ sal_uInt32 nV5CSType;
+ CIEXYZTriple aV5Endpoints;
+ sal_uInt32 nV5GammaRed;
+ sal_uInt32 nV5GammaGreen;
+ sal_uInt32 nV5GammaBlue;
+ sal_uInt32 nV5Intent;
+ sal_uInt32 nV5ProfileData;
+ sal_uInt32 nV5ProfileSize;
+ sal_uInt32 nV5Reserved;
+
+ DIBV5Header()
+ : nV5RedMask(0),
+ nV5GreenMask(0),
+ nV5BlueMask(0),
+ nV5AlphaMask(0),
+ nV5CSType(0),
+ nV5GammaRed(0),
+ nV5GammaGreen(0),
+ nV5GammaBlue(0),
+ nV5Intent(0),
+ nV5ProfileData(0),
+ nV5ProfileSize(0),
+ nV5Reserved(0)
+ {}
+};
+
+vcl::PixelFormat convertToBPP(sal_uInt16 nCount)
+{
+ return (nCount <= 1) ? vcl::PixelFormat::N1_BPP :
+ (nCount <= 8) ? vcl::PixelFormat::N8_BPP :
+ vcl::PixelFormat::N24_BPP;
+}
+
+bool isBitfieldCompression( ScanlineFormat nScanlineFormat )
+{
+ return ScanlineFormat::N32BitTcMask == nScanlineFormat;
+}
+
+bool ImplReadDIBInfoHeader(SvStream& rIStm, DIBV5Header& rHeader, bool& bTopDown, bool bMSOFormat)
+{
+ if (rIStm.remainingSize() <= 4)
+ return false;
+ // BITMAPINFOHEADER or BITMAPCOREHEADER or BITMAPV5HEADER
+ sal_uInt64 const aStartPos(rIStm.Tell());
+ rIStm.ReadUInt32( rHeader.nSize );
+
+ // BITMAPCOREHEADER
+ if ( rHeader.nSize == DIBCOREHEADERSIZE )
+ {
+ sal_Int16 nTmp16;
+
+ rIStm.ReadInt16( nTmp16 ); rHeader.nWidth = nTmp16;
+ rIStm.ReadInt16( nTmp16 ); rHeader.nHeight = nTmp16;
+ rIStm.ReadUInt16( rHeader.nPlanes );
+ rIStm.ReadUInt16( rHeader.nBitCount );
+ }
+ else if ( bMSOFormat && rHeader.nSize == DIBINFOHEADERSIZE )
+ {
+ sal_Int16 nTmp16(0);
+ rIStm.ReadInt16(nTmp16);
+ rHeader.nWidth = nTmp16;
+ rIStm.ReadInt16(nTmp16);
+ rHeader.nHeight = nTmp16;
+ sal_uInt8 nTmp8(0);
+ rIStm.ReadUChar(nTmp8);
+ rHeader.nPlanes = nTmp8;
+ rIStm.ReadUChar(nTmp8);
+ rHeader.nBitCount = nTmp8;
+ rIStm.ReadInt16(nTmp16);
+ rHeader.nSizeImage = nTmp16;
+ rIStm.ReadInt16(nTmp16);
+ rHeader.nCompression = nTmp16;
+ if ( !rHeader.nSizeImage ) // uncompressed?
+ rHeader.nSizeImage = ((rHeader.nWidth * rHeader.nBitCount + 31) & ~31) / 8 * rHeader.nHeight;
+ rIStm.ReadInt32( rHeader.nXPelsPerMeter );
+ rIStm.ReadInt32( rHeader.nYPelsPerMeter );
+ rIStm.ReadUInt32( rHeader.nColsUsed );
+ rIStm.ReadUInt32( rHeader.nColsImportant );
+ }
+ else
+ {
+ // BITMAPCOREHEADER, BITMAPV5HEADER or unknown. Read as far as possible
+ std::size_t nUsed(sizeof(rHeader.nSize));
+
+ auto readUInt16 = [&nUsed, &rHeader, &rIStm](sal_uInt16 & v) {
+ if (nUsed < rHeader.nSize) {
+ rIStm.ReadUInt16(v);
+ nUsed += sizeof(v);
+ }
+ };
+ auto readInt32 = [&nUsed, &rHeader, &rIStm](sal_Int32 & v) {
+ if (nUsed < rHeader.nSize) {
+ rIStm.ReadInt32(v);
+ nUsed += sizeof(v);
+ }
+ };
+ auto readUInt32 = [&nUsed, &rHeader, &rIStm](sal_uInt32 & v) {
+ if (nUsed < rHeader.nSize) {
+ rIStm.ReadUInt32(v);
+ nUsed += sizeof(v);
+ }
+ };
+
+ // read DIBInfoHeader entries
+ readInt32( rHeader.nWidth );
+ readInt32( rHeader.nHeight );
+ readUInt16( rHeader.nPlanes );
+ readUInt16( rHeader.nBitCount );
+ readUInt32( rHeader.nCompression );
+ readUInt32( rHeader.nSizeImage );
+ readInt32( rHeader.nXPelsPerMeter );
+ readInt32( rHeader.nYPelsPerMeter );
+ readUInt32( rHeader.nColsUsed );
+ readUInt32( rHeader.nColsImportant );
+
+ // read DIBV5HEADER members
+ readUInt32( rHeader.nV5RedMask );
+ readUInt32( rHeader.nV5GreenMask );
+ readUInt32( rHeader.nV5BlueMask );
+ readUInt32( rHeader.nV5AlphaMask );
+ readUInt32( rHeader.nV5CSType );
+
+ // read contained CIEXYZTriple's
+ readInt32( rHeader.aV5Endpoints.aXyzRed.aXyzX );
+ readInt32( rHeader.aV5Endpoints.aXyzRed.aXyzY );
+ readInt32( rHeader.aV5Endpoints.aXyzRed.aXyzZ );
+ readInt32( rHeader.aV5Endpoints.aXyzGreen.aXyzX );
+ readInt32( rHeader.aV5Endpoints.aXyzGreen.aXyzY );
+ readInt32( rHeader.aV5Endpoints.aXyzGreen.aXyzZ );
+ readInt32( rHeader.aV5Endpoints.aXyzBlue.aXyzX );
+ readInt32( rHeader.aV5Endpoints.aXyzBlue.aXyzY );
+ readInt32( rHeader.aV5Endpoints.aXyzBlue.aXyzZ );
+
+ readUInt32( rHeader.nV5GammaRed );
+ readUInt32( rHeader.nV5GammaGreen );
+ readUInt32( rHeader.nV5GammaBlue );
+ readUInt32( rHeader.nV5Intent );
+ readUInt32( rHeader.nV5ProfileData );
+ readUInt32( rHeader.nV5ProfileSize );
+ readUInt32( rHeader.nV5Reserved );
+
+ // Read color mask. An additional 12 bytes of color bitfields follow the info header (WinBMPv3-NT)
+ sal_uInt32 nColorMask = 0;
+ if (BITFIELDS == rHeader.nCompression && DIBINFOHEADERSIZE == rHeader.nSize)
+ {
+ rIStm.ReadUInt32( rHeader.nV5RedMask );
+ rIStm.ReadUInt32( rHeader.nV5GreenMask );
+ rIStm.ReadUInt32( rHeader.nV5BlueMask );
+ nColorMask = 12;
+ }
+
+ // seek to EndPos
+ if (!checkSeek(rIStm, aStartPos + rHeader.nSize + nColorMask))
+ return false;
+ }
+
+ if (!rIStm.good() || rHeader.nHeight == SAL_MIN_INT32)
+ return false;
+
+ if ( rHeader.nHeight < 0 )
+ {
+ bTopDown = true;
+ rHeader.nHeight *= -1;
+ }
+ else
+ {
+ bTopDown = false;
+ }
+
+ if ( rHeader.nWidth < 0 || rHeader.nXPelsPerMeter < 0 || rHeader.nYPelsPerMeter < 0 )
+ {
+ rIStm.SetError( SVSTREAM_FILEFORMAT_ERROR );
+ }
+
+ // #144105# protect a little against damaged files
+ assert(rHeader.nHeight >= 0);
+ if (rHeader.nHeight != 0 && rHeader.nWidth >= 0
+ && (rHeader.nSizeImage / 16 / static_cast<sal_uInt32>(rHeader.nHeight)
+ > o3tl::make_unsigned(rHeader.nWidth)))
+ {
+ rHeader.nSizeImage = 0;
+ }
+
+
+ if (rHeader.nPlanes != 1)
+ return false;
+
+ if (rHeader.nBitCount != 0 && rHeader.nBitCount != 1 &&
+ rHeader.nBitCount != 4 && rHeader.nBitCount != 8 &&
+ rHeader.nBitCount != 16 && rHeader.nBitCount != 24 &&
+ rHeader.nBitCount != 32)
+ {
+ return false;
+ }
+
+ return rIStm.good();
+}
+
+bool ImplReadDIBPalette(SvStream& rIStm, BitmapPalette& rPal, bool bQuad)
+{
+ const sal_uInt16 nColors = rPal.GetEntryCount();
+ const sal_uLong nPalSize = nColors * ( bQuad ? 4UL : 3UL );
+ BitmapColor aPalColor;
+
+ std::unique_ptr<sal_uInt8[]> pEntries(new sal_uInt8[ nPalSize ]);
+ if (rIStm.ReadBytes(pEntries.get(), nPalSize) != nPalSize)
+ {
+ return false;
+ }
+
+ sal_uInt8* pTmpEntry = pEntries.get();
+ for( sal_uInt16 i = 0; i < nColors; i++ )
+ {
+ aPalColor.SetBlue( *pTmpEntry++ );
+ aPalColor.SetGreen( *pTmpEntry++ );
+ aPalColor.SetRed( *pTmpEntry++ );
+
+ if( bQuad )
+ pTmpEntry++;
+
+ rPal[i] = aPalColor;
+ }
+
+ return rIStm.GetError() == ERRCODE_NONE;
+}
+
+BitmapColor SanitizePaletteIndex(sal_uInt8 nIndex, BitmapPalette& rPalette, bool bForceToMonoWhileReading)
+{
+ const sal_uInt16 nPaletteEntryCount = rPalette.GetEntryCount();
+ if (nPaletteEntryCount && nIndex >= nPaletteEntryCount)
+ {
+ auto nSanitizedIndex = nIndex % nPaletteEntryCount;
+ SAL_WARN_IF(nIndex != nSanitizedIndex, "vcl", "invalid colormap index: "
+ << static_cast<unsigned int>(nIndex) << ", colormap len is: "
+ << nPaletteEntryCount);
+ nIndex = nSanitizedIndex;
+ }
+
+ if (nPaletteEntryCount && bForceToMonoWhileReading)
+ {
+ return BitmapColor(static_cast<sal_uInt8>(rPalette[nIndex].GetLuminance() >= 255));
+ }
+
+ return BitmapColor(nIndex);
+}
+
+BitmapColor SanitizeColor(const BitmapColor &rColor, bool bForceToMonoWhileReading)
+{
+ if (!bForceToMonoWhileReading)
+ return rColor;
+ return BitmapColor(static_cast<sal_uInt8>(rColor.GetLuminance() >= 255));
+}
+
+bool ImplDecodeRLE(sal_uInt8* pBuffer, DIBV5Header const & rHeader, BitmapWriteAccess& rAcc, BitmapPalette& rPalette, bool bForceToMonoWhileReading, bool bRLE4)
+{
+ Scanline pRLE = pBuffer;
+ Scanline pEndRLE = pBuffer + rHeader.nSizeImage;
+ tools::Long nY = rHeader.nHeight - 1;
+ const sal_uLong nWidth = rAcc.Width();
+ sal_uLong nCountByte;
+ sal_uLong nRunByte;
+ sal_uLong nX = 0;
+ sal_uInt8 cTmp;
+ bool bEndDecoding = false;
+
+ do
+ {
+ if (pRLE == pEndRLE)
+ return false;
+ if( ( nCountByte = *pRLE++ ) == 0 )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+ nRunByte = *pRLE++;
+
+ if( nRunByte > 2 )
+ {
+ Scanline pScanline = rAcc.GetScanline(nY);
+ if( bRLE4 )
+ {
+ nCountByte = nRunByte >> 1;
+
+ for( sal_uLong i = 0; i < nCountByte; i++ )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ cTmp = *pRLE++;
+
+ if( nX < nWidth )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp >> 4, rPalette, bForceToMonoWhileReading));
+
+ if( nX < nWidth )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp & 0x0f, rPalette, bForceToMonoWhileReading));
+ }
+
+ if( nRunByte & 1 )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ if( nX < nWidth )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(*pRLE >> 4, rPalette, bForceToMonoWhileReading));
+
+ pRLE++;
+ }
+
+ if( ( ( nRunByte + 1 ) >> 1 ) & 1 )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ pRLE++;
+ }
+ }
+ else
+ {
+ for( sal_uLong i = 0; i < nRunByte; i++ )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ if( nX < nWidth )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(*pRLE, rPalette, bForceToMonoWhileReading));
+
+ pRLE++;
+ }
+
+ if( nRunByte & 1 )
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ pRLE++;
+ }
+ }
+ }
+ else if( !nRunByte )
+ {
+ nY--;
+ nX = 0;
+ }
+ else if( nRunByte == 1 )
+ bEndDecoding = true;
+ else
+ {
+ if (pRLE == pEndRLE)
+ return false;
+
+ nX += *pRLE++;
+
+ if (pRLE == pEndRLE)
+ return false;
+
+ nY -= *pRLE++;
+ }
+ }
+ else
+ {
+ if (pRLE == pEndRLE)
+ return false;
+ cTmp = *pRLE++;
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ if( bRLE4 )
+ {
+ nRunByte = nCountByte >> 1;
+
+ for (sal_uLong i = 0; i < nRunByte && nX < nWidth; ++i)
+ {
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp >> 4, rPalette, bForceToMonoWhileReading));
+ if( nX < nWidth )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp & 0x0f, rPalette, bForceToMonoWhileReading));
+ }
+
+ if( ( nCountByte & 1 ) && ( nX < nWidth ) )
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp >> 4, rPalette, bForceToMonoWhileReading));
+ }
+ else
+ {
+ for (sal_uLong i = 0; i < nCountByte && nX < nWidth; ++i)
+ rAcc.SetPixelOnData(pScanline, nX++, SanitizePaletteIndex(cTmp, rPalette, bForceToMonoWhileReading));
+ }
+ }
+ }
+ while (!bEndDecoding && (nY >= 0));
+
+ return true;
+}
+
+bool ImplReadDIBBits(SvStream& rIStm, DIBV5Header& rHeader, BitmapWriteAccess& rAcc, BitmapPalette& rPalette, BitmapWriteAccess* pAccAlpha,
+ bool bTopDown, bool& rAlphaUsed, const sal_uInt64 nAlignedWidth,
+ const bool bForceToMonoWhileReading)
+{
+ sal_uInt32 nRMask(( rHeader.nBitCount == 16 ) ? 0x00007c00UL : 0x00ff0000UL);
+ sal_uInt32 nGMask(( rHeader.nBitCount == 16 ) ? 0x000003e0UL : 0x0000ff00UL);
+ sal_uInt32 nBMask(( rHeader.nBitCount == 16 ) ? 0x0000001fUL : 0x000000ffUL);
+ bool bNative(false);
+ bool bTCMask(!pAccAlpha && ((16 == rHeader.nBitCount) || (32 == rHeader.nBitCount)));
+ bool bRLE((RLE_8 == rHeader.nCompression && 8 == rHeader.nBitCount) || (RLE_4 == rHeader.nCompression && 4 == rHeader.nBitCount));
+
+ // Is native format?
+ switch(rAcc.GetScanlineFormat())
+ {
+ case ScanlineFormat::N1BitMsbPal:
+ case ScanlineFormat::N24BitTcBgr:
+ {
+ // we can't trust arbitrary-sourced index based formats to have correct indexes, so we exclude the pal formats
+ // from raw read and force checking their colormap indexes
+ bNative = ( ( rAcc.IsBottomUp() != bTopDown ) && !bRLE && !bTCMask && ( rAcc.GetScanlineSize() == nAlignedWidth ) );
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+
+ // Read data
+ if (bNative)
+ {
+ if (nAlignedWidth
+ > std::numeric_limits<std::size_t>::max() / rHeader.nHeight)
+ {
+ return false;
+ }
+ std::size_t n = nAlignedWidth * rHeader.nHeight;
+ if (rIStm.ReadBytes(rAcc.GetBuffer(), n) != n)
+ {
+ return false;
+ }
+ }
+ else
+ {
+ if (rHeader.nV5RedMask > 0)
+ nRMask = rHeader.nV5RedMask;
+ if (rHeader.nV5GreenMask > 0)
+ nGMask = rHeader.nV5GreenMask;
+ if (rHeader.nV5BlueMask > 0)
+ nBMask = rHeader.nV5BlueMask;
+
+ const tools::Long nWidth(rHeader.nWidth);
+ const tools::Long nHeight(rHeader.nHeight);
+ tools::Long nResult = 0;
+ if (utl::ConfigManager::IsFuzzing() && (o3tl::checked_multiply(nWidth, nHeight, nResult) || nResult > 4000000))
+ return false;
+
+ if (bRLE)
+ {
+ if(!rHeader.nSizeImage)
+ {
+ rHeader.nSizeImage = rIStm.remainingSize();
+ }
+
+ if (rHeader.nSizeImage > rIStm.remainingSize())
+ return false;
+ std::vector<sal_uInt8> aBuffer(rHeader.nSizeImage);
+ if (rIStm.ReadBytes(aBuffer.data(), rHeader.nSizeImage) != rHeader.nSizeImage)
+ return false;
+ if (!ImplDecodeRLE(aBuffer.data(), rHeader, rAcc, rPalette, bForceToMonoWhileReading, RLE_4 == rHeader.nCompression))
+ return false;
+ }
+ else
+ {
+ if (nAlignedWidth > rIStm.remainingSize())
+ {
+ // ofz#11188 avoid timeout
+ // all following paths will enter a case statement, and nCount
+ // is always at least 1, so we can check here before allocation
+ // if at least one row can be read
+ return false;
+ }
+ std::vector<sal_uInt8> aBuf(nAlignedWidth);
+
+ const tools::Long nI(bTopDown ? 1 : -1);
+ tools::Long nY(bTopDown ? 0 : nHeight - 1);
+ tools::Long nCount(nHeight);
+
+ switch(rHeader.nBitCount)
+ {
+ case 1:
+ {
+ for( ; nCount--; nY += nI )
+ {
+ sal_uInt8 * pTmp = aBuf.data();
+ if (rIStm.ReadBytes(pTmp, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+ sal_uInt8 cTmp = *pTmp++;
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0, nShift = 8; nX < nWidth; nX++ )
+ {
+ if( !nShift )
+ {
+ nShift = 8;
+ cTmp = *pTmp++;
+ }
+
+ auto nIndex = (cTmp >> --nShift) & 1;
+ rAcc.SetPixelOnData(pScanline, nX, SanitizePaletteIndex(nIndex, rPalette, bForceToMonoWhileReading));
+ }
+ }
+ }
+ break;
+
+ case 4:
+ {
+ for( ; nCount--; nY += nI )
+ {
+ sal_uInt8 * pTmp = aBuf.data();
+ if (rIStm.ReadBytes(pTmp, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+ sal_uInt8 cTmp = *pTmp++;
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0, nShift = 2; nX < nWidth; nX++ )
+ {
+ if( !nShift )
+ {
+ nShift = 2;
+ cTmp = *pTmp++;
+ }
+
+ auto nIndex = (cTmp >> ( --nShift << 2 ) ) & 0x0f;
+ rAcc.SetPixelOnData(pScanline, nX, SanitizePaletteIndex(nIndex, rPalette, bForceToMonoWhileReading));
+ }
+ }
+ }
+ break;
+
+ case 8:
+ {
+ for( ; nCount--; nY += nI )
+ {
+ sal_uInt8 * pTmp = aBuf.data();
+ if (rIStm.ReadBytes(pTmp, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ auto nIndex = *pTmp++;
+ rAcc.SetPixelOnData(pScanline, nX, SanitizePaletteIndex(nIndex, rPalette, bForceToMonoWhileReading));
+ }
+ }
+ }
+ break;
+
+ case 16:
+ {
+ ColorMaskElement aRedMask(nRMask);
+ if (!aRedMask.CalcMaskShift())
+ return false;
+ ColorMaskElement aGreenMask(nGMask);
+ if (!aGreenMask.CalcMaskShift())
+ return false;
+ ColorMaskElement aBlueMask(nBMask);
+ if (!aBlueMask.CalcMaskShift())
+ return false;
+
+ ColorMask aMask(aRedMask, aGreenMask, aBlueMask);
+ BitmapColor aColor;
+
+ for( ; nCount--; nY += nI )
+ {
+ sal_uInt16 * pTmp16 = reinterpret_cast<sal_uInt16*>(aBuf.data());
+ if (rIStm.ReadBytes(pTmp16, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ aMask.GetColorFor16BitLSB( aColor, reinterpret_cast<sal_uInt8*>(pTmp16++) );
+ rAcc.SetPixelOnData(pScanline, nX, SanitizeColor(aColor, bForceToMonoWhileReading));
+ }
+ }
+ }
+ break;
+
+ case 24:
+ {
+ BitmapColor aPixelColor;
+
+ for( ; nCount--; nY += nI )
+ {
+ sal_uInt8* pTmp = aBuf.data();
+ if (rIStm.ReadBytes(pTmp, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ aPixelColor.SetBlue( *pTmp++ );
+ aPixelColor.SetGreen( *pTmp++ );
+ aPixelColor.SetRed( *pTmp++ );
+ rAcc.SetPixelOnData(pScanline, nX, SanitizeColor(aPixelColor, bForceToMonoWhileReading));
+ }
+ }
+ }
+ break;
+
+ case 32:
+ {
+ ColorMaskElement aRedMask(nRMask);
+ if (!aRedMask.CalcMaskShift())
+ return false;
+ ColorMaskElement aGreenMask(nGMask);
+ if (!aGreenMask.CalcMaskShift())
+ return false;
+ ColorMaskElement aBlueMask(nBMask);
+ if (!aBlueMask.CalcMaskShift())
+ return false;
+ ColorMask aMask(aRedMask, aGreenMask, aBlueMask);
+
+ BitmapColor aColor;
+ sal_uInt32* pTmp32;
+
+ if(pAccAlpha)
+ {
+ sal_uInt8 aAlpha;
+
+ for( ; nCount--; nY += nI )
+ {
+ pTmp32 = reinterpret_cast<sal_uInt32*>(aBuf.data());
+ if (rIStm.ReadBytes(pTmp32, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ Scanline pAlphaScanline = pAccAlpha->GetScanline(nY);
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ aMask.GetColorAndAlphaFor32Bit( aColor, aAlpha, reinterpret_cast<sal_uInt8*>(pTmp32++) );
+ rAcc.SetPixelOnData(pScanline, nX, SanitizeColor(aColor, bForceToMonoWhileReading));
+ pAccAlpha->SetPixelOnData(pAlphaScanline, nX, BitmapColor(sal_uInt8(0xff) - aAlpha));
+ rAlphaUsed |= 0xff != aAlpha;
+ }
+ }
+ }
+ else
+ {
+ for( ; nCount--; nY += nI )
+ {
+ pTmp32 = reinterpret_cast<sal_uInt32*>(aBuf.data());
+ if (rIStm.ReadBytes(pTmp32, nAlignedWidth)
+ != nAlignedWidth)
+ {
+ return false;
+ }
+
+ Scanline pScanline = rAcc.GetScanline(nY);
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ aMask.GetColorFor32Bit( aColor, reinterpret_cast<sal_uInt8*>(pTmp32++) );
+ rAcc.SetPixelOnData(pScanline, nX, SanitizeColor(aColor, bForceToMonoWhileReading));
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return rIStm.GetError() == ERRCODE_NONE;
+}
+
+bool ImplReadDIBBody(SvStream& rIStm, Bitmap& rBmp, AlphaMask* pBmpAlpha, sal_uInt64 nOffset, bool bIsMask, bool bMSOFormat)
+{
+ DIBV5Header aHeader;
+ const sal_uInt64 nStmPos = rIStm.Tell();
+ bool bTopDown(false);
+
+ if (!ImplReadDIBInfoHeader(rIStm, aHeader, bTopDown, bMSOFormat))
+ return false;
+
+ //BI_BITCOUNT_0 jpeg/png is unsupported
+ if (aHeader.nBitCount == 0)
+ return false;
+
+ if (aHeader.nWidth <= 0 || aHeader.nHeight <= 0)
+ return false;
+
+ // In case ImplReadDIB() didn't call ImplReadDIBFileHeader() before
+ // this method, nOffset is 0, that's OK.
+ if (nOffset && aHeader.nSize > nOffset)
+ {
+ // Header size claims to extend into the image data.
+ // Looks like an error.
+ return false;
+ }
+
+ sal_uInt16 nColors(0);
+ SvStream* pIStm;
+ std::unique_ptr<SvMemoryStream> pMemStm;
+ std::vector<sal_uInt8> aData;
+
+ if (aHeader.nBitCount <= 8)
+ {
+ if(aHeader.nColsUsed)
+ {
+ nColors = static_cast<sal_uInt16>(aHeader.nColsUsed);
+ }
+ else
+ {
+ nColors = ( 1 << aHeader.nBitCount );
+ }
+ }
+
+ if (ZCOMPRESS == aHeader.nCompression)
+ {
+ sal_uInt32 nCodedSize(0);
+ sal_uInt32 nUncodedSize(0);
+
+ // read coding information
+ rIStm.ReadUInt32( nCodedSize ).ReadUInt32( nUncodedSize ).ReadUInt32( aHeader.nCompression );
+ if (nCodedSize > rIStm.remainingSize())
+ nCodedSize = sal_uInt32(rIStm.remainingSize());
+
+ pMemStm.reset(new SvMemoryStream);
+ // There may be bytes left over or the codec might read more than
+ // necessary. So to preserve the correctness of the source stream copy
+ // the encoded block
+ pMemStm->WriteStream(rIStm, nCodedSize);
+ pMemStm->Seek(0);
+
+ size_t nSizeInc(4 * pMemStm->remainingSize());
+ if (nUncodedSize < nSizeInc)
+ nSizeInc = nUncodedSize;
+
+ if (nSizeInc > 0)
+ {
+ // decode buffer
+ ZCodec aCodec;
+ aCodec.BeginCompression();
+ aData.resize(nSizeInc);
+ size_t nDataPos(0);
+ while (nUncodedSize > nDataPos)
+ {
+ assert(aData.size() > nDataPos);
+ const size_t nToRead(std::min<size_t>(nUncodedSize - nDataPos, aData.size() - nDataPos));
+ assert(nToRead > 0);
+ assert(!aData.empty());
+ const tools::Long nRead = aCodec.Read(*pMemStm, aData.data() + nDataPos, sal_uInt32(nToRead));
+ if (nRead > 0)
+ {
+ nDataPos += static_cast<tools::ULong>(nRead);
+ // we haven't read everything yet: resize buffer and continue
+ if (nDataPos < nUncodedSize)
+ aData.resize(aData.size() + nSizeInc);
+ }
+ else
+ {
+ break;
+ }
+ }
+ // truncate the data buffer to actually read size
+ aData.resize(nDataPos);
+ // set the real uncoded size
+ nUncodedSize = sal_uInt32(aData.size());
+ aCodec.EndCompression();
+ }
+
+ if (aData.empty())
+ {
+ // add something so we can take address of the first element
+ aData.resize(1);
+ nUncodedSize = 0;
+ }
+
+ // set decoded bytes to memory stream,
+ // from which we will read the bitmap data
+ pMemStm.reset(new SvMemoryStream);
+ pIStm = pMemStm.get();
+ assert(!aData.empty());
+ pMemStm->SetBuffer(aData.data(), nUncodedSize, nUncodedSize);
+ nOffset = 0;
+ }
+ else
+ {
+ pIStm = &rIStm;
+ }
+
+ // read palette
+ BitmapPalette aPalette;
+ if (nColors)
+ {
+ aPalette.SetEntryCount(nColors);
+ ImplReadDIBPalette(*pIStm, aPalette, aHeader.nSize != DIBCOREHEADERSIZE);
+ }
+
+ if (pIStm->GetError())
+ return false;
+
+ if (nOffset)
+ {
+ // It is problematic to seek backwards. We are at the
+ // end of BITMAPINFOHEADER or 12 bytes further in case
+ // of WinBMPv3-NT format. It is possible to seek forward
+ // though because a gap may be there.
+ sal_Int32 nSeekRel = nOffset - (pIStm->Tell() - nStmPos);
+ if (nSeekRel > 0)
+ pIStm->SeekRel(nSeekRel);
+ }
+
+ const sal_Int64 nBitsPerLine (static_cast<sal_Int64>(aHeader.nWidth) * static_cast<sal_Int64>(aHeader.nBitCount));
+ if (nBitsPerLine > SAL_MAX_UINT32)
+ return false;
+ const sal_uInt64 nAlignedWidth(AlignedWidth4Bytes(static_cast<sal_uLong>(nBitsPerLine)));
+
+ switch (aHeader.nCompression)
+ {
+ case RLE_8:
+ {
+ if (aHeader.nBitCount != 8)
+ return false;
+ // (partially) check the image dimensions to avoid potential large bitmap allocation if the input is damaged
+ sal_uInt64 nMaxWidth = pIStm->remainingSize();
+ nMaxWidth *= 256; //assume generous compression ratio
+ nMaxWidth /= aHeader.nHeight;
+ if (nMaxWidth < o3tl::make_unsigned(aHeader.nWidth))
+ return false;
+ break;
+ }
+ case RLE_4:
+ {
+ if (aHeader.nBitCount != 4)
+ return false;
+ sal_uInt64 nMaxWidth = pIStm->remainingSize();
+ nMaxWidth *= 512; //assume generous compression ratio
+ nMaxWidth /= aHeader.nHeight;
+ if (nMaxWidth < o3tl::make_unsigned(aHeader.nWidth))
+ return false;
+ break;
+ }
+ default:
+ // tdf#122958 invalid compression value used
+ if (aHeader.nCompression & 0x000F)
+ {
+ // lets assume that there was an error in the generating application
+ // and allow through as COMPRESS_NONE if the bottom byte is 0
+ SAL_WARN( "vcl", "bad bmp compression scheme: " << aHeader.nCompression << ", rejecting bmp");
+ return false;
+ }
+ else
+ SAL_WARN( "vcl", "bad bmp compression scheme: " << aHeader.nCompression << ", assuming meant to be COMPRESS_NONE");
+ [[fallthrough]];
+ case BITFIELDS:
+ case ZCOMPRESS:
+ case COMPRESS_NONE:
+ {
+ // (partially) check the image dimensions to avoid potential large bitmap allocation if the input is damaged
+ sal_uInt64 nMaxWidth = pIStm->remainingSize();
+ nMaxWidth /= aHeader.nHeight;
+ if (nMaxWidth < nAlignedWidth)
+ return false;
+ break;
+ }
+ }
+
+ const Size aSizePixel(aHeader.nWidth, aHeader.nHeight);
+ AlphaMask aNewBmpAlpha;
+ AlphaScopedWriteAccess pAccAlpha;
+ bool bAlphaPossible(pBmpAlpha && aHeader.nBitCount == 32);
+
+ if (bAlphaPossible)
+ {
+ const bool bRedSet(0 != aHeader.nV5RedMask);
+ const bool bGreenSet(0 != aHeader.nV5GreenMask);
+ const bool bBlueSet(0 != aHeader.nV5BlueMask);
+
+ // some clipboard entries have alpha mask on zero to say that there is
+ // no alpha; do only use this when the other masks are set. The MS docu
+ // says that masks are only to be set when bV5Compression is set to
+ // BI_BITFIELDS, but there seem to exist a wild variety of usages...
+ if((bRedSet || bGreenSet || bBlueSet) && (0 == aHeader.nV5AlphaMask))
+ {
+ bAlphaPossible = false;
+ }
+ }
+
+ if (bAlphaPossible)
+ {
+ aNewBmpAlpha = AlphaMask(aSizePixel);
+ pAccAlpha = AlphaScopedWriteAccess(aNewBmpAlpha);
+ }
+
+ vcl::PixelFormat ePixelFormat(convertToBPP(aHeader.nBitCount));
+ const BitmapPalette* pPal = &aPalette;
+ //ofz#948 match the surrounding logic of case TransparentType::Bitmap of
+ //ReadDIBBitmapEx but do it while reading for performance
+ const bool bIsAlpha = (ePixelFormat == vcl::PixelFormat::N8_BPP &&
+ !!aPalette && aPalette.IsGreyPalette8Bit());
+ const bool bForceToMonoWhileReading = (bIsMask && !bIsAlpha && ePixelFormat != vcl::PixelFormat::N1_BPP);
+ if (bForceToMonoWhileReading)
+ {
+ pPal = nullptr;
+ ePixelFormat = vcl::PixelFormat::N1_BPP;
+ SAL_WARN( "vcl", "forcing mask to monochrome");
+ }
+
+ Bitmap aNewBmp(aSizePixel, ePixelFormat, pPal);
+ BitmapScopedWriteAccess pAcc(aNewBmp);
+ if (!pAcc)
+ return false;
+ if (pAcc->Width() != aHeader.nWidth || pAcc->Height() != aHeader.nHeight)
+ {
+ return false;
+ }
+
+ // read bits
+ bool bAlphaUsed(false);
+ bool bRet = ImplReadDIBBits(*pIStm, aHeader, *pAcc, aPalette, pAccAlpha.get(), bTopDown, bAlphaUsed, nAlignedWidth, bForceToMonoWhileReading);
+
+ if (bRet && aHeader.nXPelsPerMeter && aHeader.nYPelsPerMeter)
+ {
+ MapMode aMapMode(
+ MapUnit::MapMM,
+ Point(),
+ Fraction(1000, aHeader.nXPelsPerMeter),
+ Fraction(1000, aHeader.nYPelsPerMeter));
+
+ aNewBmp.SetPrefMapMode(aMapMode);
+ aNewBmp.SetPrefSize(Size(aHeader.nWidth, aHeader.nHeight));
+ }
+
+ pAcc.reset();
+
+ if (bAlphaPossible)
+ {
+ pAccAlpha.reset();
+
+ if(!bAlphaUsed)
+ {
+ bAlphaPossible = false;
+ }
+ }
+
+ if (bRet)
+ {
+ rBmp = aNewBmp;
+
+ if(bAlphaPossible)
+ {
+ *pBmpAlpha = aNewBmpAlpha;
+ }
+ }
+
+ return bRet;
+}
+
+bool ImplReadDIBFileHeader( SvStream& rIStm, sal_uLong& rOffset )
+{
+ bool bRet = false;
+
+ const sal_uInt64 nStreamLength = rIStm.TellEnd();
+
+ sal_uInt16 nTmp16 = 0;
+ rIStm.ReadUInt16( nTmp16 );
+
+ if ( ( 0x4D42 == nTmp16 ) || ( 0x4142 == nTmp16 ) )
+ {
+ sal_uInt32 nTmp32(0);
+ if ( 0x4142 == nTmp16 )
+ {
+ rIStm.SeekRel( 12 );
+ rIStm.ReadUInt16( nTmp16 );
+ rIStm.SeekRel( 8 );
+ rIStm.ReadUInt32( nTmp32 );
+ rOffset = nTmp32 - 28;
+ bRet = ( 0x4D42 == nTmp16 );
+ }
+ else // 0x4D42 == nTmp16, 'MB' from BITMAPFILEHEADER
+ {
+ rIStm.SeekRel( 8 ); // we are on bfSize member of BITMAPFILEHEADER, forward to bfOffBits
+ rIStm.ReadUInt32( nTmp32 ); // read bfOffBits
+ rOffset = nTmp32 - 14; // adapt offset by sizeof(BITMAPFILEHEADER)
+ bRet = rIStm.GetError() == ERRCODE_NONE;
+ }
+
+ if ( rOffset >= nStreamLength )
+ {
+ // Offset claims that image starts past the end of the
+ // stream. Unlikely.
+ rIStm.SetError( SVSTREAM_FILEFORMAT_ERROR );
+ bRet = false;
+ }
+ }
+ else
+ rIStm.SetError( SVSTREAM_FILEFORMAT_ERROR );
+
+ return bRet;
+}
+
+bool ImplWriteDIBPalette( SvStream& rOStm, BitmapReadAccess const & rAcc )
+{
+ const sal_uInt16 nColors = rAcc.GetPaletteEntryCount();
+ const sal_uLong nPalSize = nColors * 4UL;
+ std::unique_ptr<sal_uInt8[]> pEntries(new sal_uInt8[ nPalSize ]);
+ sal_uInt8* pTmpEntry = pEntries.get();
+
+ for( sal_uInt16 i = 0; i < nColors; i++ )
+ {
+ const BitmapColor& rPalColor = rAcc.GetPaletteColor( i );
+
+ *pTmpEntry++ = rPalColor.GetBlue();
+ *pTmpEntry++ = rPalColor.GetGreen();
+ *pTmpEntry++ = rPalColor.GetRed();
+ *pTmpEntry++ = 0;
+ }
+
+ rOStm.WriteBytes( pEntries.get(), nPalSize );
+
+ return rOStm.GetError() == ERRCODE_NONE;
+}
+
+bool ImplWriteRLE( SvStream& rOStm, BitmapReadAccess const & rAcc, bool bRLE4 )
+{
+ const sal_uLong nWidth = rAcc.Width();
+ const sal_uLong nHeight = rAcc.Height();
+ sal_uLong nX;
+ sal_uLong nSaveIndex;
+ sal_uLong nCount;
+ sal_uLong nBufCount;
+ std::vector<sal_uInt8> aBuf(( nWidth << 1 ) + 2);
+ sal_uInt8 cPix;
+ sal_uInt8 cLast;
+ bool bFound;
+
+ for ( tools::Long nY = nHeight - 1; nY >= 0; nY-- )
+ {
+ sal_uInt8* pTmp = aBuf.data();
+ nX = nBufCount = 0;
+ Scanline pScanline = rAcc.GetScanline( nY );
+
+ while( nX < nWidth )
+ {
+ nCount = 1;
+ cPix = rAcc.GetIndexFromData( pScanline, nX++ );
+
+ while( ( nX < nWidth ) && ( nCount < 255 )
+ && ( cPix == rAcc.GetIndexFromData( pScanline, nX ) ) )
+ {
+ nX++;
+ nCount++;
+ }
+
+ if ( nCount > 1 )
+ {
+ *pTmp++ = static_cast<sal_uInt8>(nCount);
+ *pTmp++ = ( bRLE4 ? ( ( cPix << 4 ) | cPix ) : cPix );
+ nBufCount += 2;
+ }
+ else
+ {
+ cLast = cPix;
+ nSaveIndex = nX - 1;
+ bFound = false;
+
+ while( ( nX < nWidth ) && ( nCount < 256 ) )
+ {
+ cPix = rAcc.GetIndexFromData( pScanline, nX );
+ if (cPix == cLast)
+ break;
+ nX++; nCount++;
+ cLast = cPix;
+ bFound = true;
+ }
+
+ if ( bFound )
+ nX--;
+
+ if ( nCount > 3 )
+ {
+ *pTmp++ = 0;
+ *pTmp++ = static_cast<sal_uInt8>(--nCount);
+
+ if( bRLE4 )
+ {
+ for ( sal_uLong i = 0; i < nCount; i++, pTmp++ )
+ {
+ *pTmp = rAcc.GetIndexFromData( pScanline, nSaveIndex++ ) << 4;
+
+ if ( ++i < nCount )
+ *pTmp |= rAcc.GetIndexFromData( pScanline, nSaveIndex++ );
+ }
+
+ nCount = ( nCount + 1 ) >> 1;
+ }
+ else
+ {
+ for( sal_uLong i = 0; i < nCount; i++ )
+ *pTmp++ = rAcc.GetIndexFromData( pScanline, nSaveIndex++ );
+ }
+
+ if ( nCount & 1 )
+ {
+ *pTmp++ = 0;
+ nBufCount += ( nCount + 3 );
+ }
+ else
+ nBufCount += ( nCount + 2 );
+ }
+ else
+ {
+ *pTmp++ = 1;
+ *pTmp++ = rAcc.GetIndexFromData( pScanline, nSaveIndex ) << (bRLE4 ? 4 : 0);
+
+ if ( nCount == 3 )
+ {
+ *pTmp++ = 1;
+ *pTmp++ = rAcc.GetIndexFromData( pScanline, ++nSaveIndex ) << ( bRLE4 ? 4 : 0 );
+ nBufCount += 4;
+ }
+ else
+ nBufCount += 2;
+ }
+ }
+ }
+
+ aBuf[ nBufCount++ ] = 0;
+ aBuf[ nBufCount++ ] = 0;
+
+ rOStm.WriteBytes(aBuf.data(), nBufCount);
+ }
+
+ rOStm.WriteUChar( 0 );
+ rOStm.WriteUChar( 1 );
+
+ return rOStm.GetError() == ERRCODE_NONE;
+}
+
+bool ImplWriteDIBBits(SvStream& rOStm, BitmapReadAccess const & rAcc, BitmapReadAccess const * pAccAlpha, sal_uLong nCompression, sal_uInt32& rImageSize)
+{
+ if(!pAccAlpha && BITFIELDS == nCompression)
+ {
+ const ColorMask& rMask = rAcc.GetColorMask();
+ SVBT32 aVal32;
+
+ UInt32ToSVBT32( rMask.GetRedMask(), aVal32 );
+ rOStm.WriteBytes( aVal32, 4UL );
+
+ UInt32ToSVBT32( rMask.GetGreenMask(), aVal32 );
+ rOStm.WriteBytes( aVal32, 4UL );
+
+ UInt32ToSVBT32( rMask.GetBlueMask(), aVal32 );
+ rOStm.WriteBytes( aVal32, 4UL );
+
+ rImageSize = rOStm.Tell();
+
+ if( rAcc.IsBottomUp() )
+ rOStm.WriteBytes(rAcc.GetBuffer(), rAcc.Height() * rAcc.GetScanlineSize());
+ else
+ {
+ for( tools::Long nY = rAcc.Height() - 1, nScanlineSize = rAcc.GetScanlineSize(); nY >= 0; nY-- )
+ rOStm.WriteBytes( rAcc.GetScanline(nY), nScanlineSize );
+ }
+ }
+ else if(!pAccAlpha && ((RLE_4 == nCompression) || (RLE_8 == nCompression)))
+ {
+ rImageSize = rOStm.Tell();
+ ImplWriteRLE( rOStm, rAcc, RLE_4 == nCompression );
+ }
+ else if(!nCompression)
+ {
+ // #i5xxx# Limit bitcount to 24bit, the 32 bit cases are not
+ // handled properly below (would have to set color masks, and
+ // nCompression=BITFIELDS - but color mask is not set for
+ // formats != *_TC_*). Note that this very problem might cause
+ // trouble at other places - the introduction of 32 bit RGBA
+ // bitmaps is relatively recent.
+ // #i59239# discretize bitcount for aligned width to 1,8,24
+ // (other cases are not written below)
+ const auto ePixelFormat(pAccAlpha ? vcl::PixelFormat::N32_BPP : convertToBPP(rAcc.GetBitCount()));
+ const sal_uLong nAlignedWidth(AlignedWidth4Bytes(rAcc.Width() * sal_Int32(ePixelFormat)));
+ bool bNative(false);
+
+ switch(rAcc.GetScanlineFormat())
+ {
+ case ScanlineFormat::N1BitMsbPal:
+ case ScanlineFormat::N8BitPal:
+ case ScanlineFormat::N24BitTcBgr:
+ {
+ if(!pAccAlpha && rAcc.IsBottomUp() && (rAcc.GetScanlineSize() == nAlignedWidth))
+ {
+ bNative = true;
+ }
+
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+
+ rImageSize = rOStm.Tell();
+
+ if(bNative)
+ {
+ rOStm.WriteBytes(rAcc.GetBuffer(), nAlignedWidth * rAcc.Height());
+ }
+ else
+ {
+ const tools::Long nWidth(rAcc.Width());
+ const tools::Long nHeight(rAcc.Height());
+ std::vector<sal_uInt8> aBuf(nAlignedWidth);
+ switch(ePixelFormat)
+ {
+ case vcl::PixelFormat::N1_BPP:
+ {
+ //valgrind, zero out the trailing unused alignment bytes
+ size_t nUnusedBytes = nAlignedWidth - ((nWidth+7) / 8);
+ memset(aBuf.data() + nAlignedWidth - nUnusedBytes, 0, nUnusedBytes);
+
+ for( tools::Long nY = nHeight - 1; nY >= 0; nY-- )
+ {
+ sal_uInt8* pTmp = aBuf.data();
+ sal_uInt8 cTmp = 0;
+ Scanline pScanline = rAcc.GetScanline( nY );
+
+ for( tools::Long nX = 0, nShift = 8; nX < nWidth; nX++ )
+ {
+ if( !nShift )
+ {
+ nShift = 8;
+ *pTmp++ = cTmp;
+ cTmp = 0;
+ }
+
+ cTmp |= rAcc.GetIndexFromData( pScanline, nX ) << --nShift;
+ }
+
+ *pTmp = cTmp;
+ rOStm.WriteBytes(aBuf.data(), nAlignedWidth);
+ }
+ }
+ break;
+
+ case vcl::PixelFormat::N8_BPP:
+ {
+ for( tools::Long nY = nHeight - 1; nY >= 0; nY-- )
+ {
+ sal_uInt8* pTmp = aBuf.data();
+ Scanline pScanline = rAcc.GetScanline( nY );
+
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ *pTmp++ = rAcc.GetIndexFromData( pScanline, nX );
+
+ rOStm.WriteBytes(aBuf.data(), nAlignedWidth);
+ }
+ }
+ break;
+
+ case vcl::PixelFormat::N24_BPP:
+ {
+ //valgrind, zero out the trailing unused alignment bytes
+ size_t nUnusedBytes = nAlignedWidth - nWidth * 3;
+ memset(aBuf.data() + nAlignedWidth - nUnusedBytes, 0, nUnusedBytes);
+ }
+ [[fallthrough]];
+ // #i59239# fallback to 24 bit format, if bitcount is non-default
+ default:
+ {
+ BitmapColor aPixelColor;
+ const bool bWriteAlpha(ePixelFormat == vcl::PixelFormat::N32_BPP && pAccAlpha);
+
+ for( tools::Long nY = nHeight - 1; nY >= 0; nY-- )
+ {
+ sal_uInt8* pTmp = aBuf.data();
+ Scanline pScanlineAlpha = bWriteAlpha ? pAccAlpha->GetScanline( nY ) : nullptr;
+
+ for( tools::Long nX = 0; nX < nWidth; nX++ )
+ {
+ // when alpha is used, this may be non-24bit main bitmap, so use GetColor
+ // instead of GetPixel to ensure RGB value
+ aPixelColor = rAcc.GetColor( nY, nX );
+
+ *pTmp++ = aPixelColor.GetBlue();
+ *pTmp++ = aPixelColor.GetGreen();
+ *pTmp++ = aPixelColor.GetRed();
+
+ if(bWriteAlpha)
+ {
+ *pTmp++ = sal_uInt8(0xff) - pAccAlpha->GetIndexFromData( pScanlineAlpha, nX );
+ }
+ }
+
+ rOStm.WriteBytes(aBuf.data(), nAlignedWidth);
+ }
+ }
+ break;
+ }
+ }
+ }
+
+ rImageSize = rOStm.Tell() - rImageSize;
+
+ return (!rOStm.GetError());
+}
+
+bool ImplWriteDIBBody(const Bitmap& rBitmap, SvStream& rOStm, BitmapReadAccess const & rAcc, BitmapReadAccess const * pAccAlpha, bool bCompressed)
+{
+ const MapMode aMapPixel(MapUnit::MapPixel);
+ DIBV5Header aHeader;
+ sal_uInt64 nImageSizePos(0);
+ sal_uInt64 nEndPos(0);
+ sal_uInt32 nCompression(COMPRESS_NONE);
+ bool bRet(false);
+
+ aHeader.nSize = pAccAlpha ? DIBV5HEADERSIZE : DIBINFOHEADERSIZE; // size dependent on CF_DIB type to use
+ aHeader.nWidth = rAcc.Width();
+ aHeader.nHeight = rAcc.Height();
+ aHeader.nPlanes = 1;
+
+ if(!pAccAlpha && isBitfieldCompression(rAcc.GetScanlineFormat()))
+ {
+ aHeader.nBitCount = 32;
+ aHeader.nSizeImage = rAcc.Height() * rAcc.GetScanlineSize();
+ nCompression = BITFIELDS;
+ }
+ else
+ {
+ // #i5xxx# Limit bitcount to 24bit, the 32 bit cases are
+ // not handled properly below (would have to set color
+ // masks, and nCompression=BITFIELDS - but color mask is
+ // not set for formats != *_TC_*). Note that this very
+ // problem might cause trouble at other places - the
+ // introduction of 32 bit RGBA bitmaps is relatively
+ // recent.
+ // #i59239# discretize bitcount to 1,8,24 (other cases
+ // are not written below)
+ const auto ePixelFormat(pAccAlpha ? vcl::PixelFormat::N32_BPP : convertToBPP(rAcc.GetBitCount()));
+ aHeader.nBitCount = sal_uInt16(ePixelFormat);
+ aHeader.nSizeImage = rAcc.Height() * AlignedWidth4Bytes(rAcc.Width() * aHeader.nBitCount);
+
+ if (bCompressed)
+ {
+ if (ePixelFormat == vcl::PixelFormat::N8_BPP)
+ nCompression = RLE_8;
+ }
+ }
+
+ if((rOStm.GetCompressMode() & SvStreamCompressFlags::ZBITMAP) && (rOStm.GetVersion() >= SOFFICE_FILEFORMAT_40))
+ {
+ aHeader.nCompression = ZCOMPRESS;
+ }
+ else
+ {
+ aHeader.nCompression = nCompression;
+ }
+
+ if(rBitmap.GetPrefSize().Width() && rBitmap.GetPrefSize().Height() && (rBitmap.GetPrefMapMode() != aMapPixel))
+ {
+ // #i48108# Try to recover xpels/ypels as previously stored on
+ // disk. The problem with just converting maPrefSize to 100th
+ // mm and then relating that to the bitmap pixel size is that
+ // MapMode is integer-based, and suffers from roundoffs,
+ // especially if maPrefSize is small. Trying to circumvent
+ // that by performing part of the math in floating point.
+ const Size aScale100000(OutputDevice::LogicToLogic(Size(100000, 100000), MapMode(MapUnit::Map100thMM), rBitmap.GetPrefMapMode()));
+ const double fBmpWidthM(static_cast<double>(rBitmap.GetPrefSize().Width()) / aScale100000.Width());
+ const double fBmpHeightM(static_cast<double>(rBitmap.GetPrefSize().Height()) / aScale100000.Height());
+
+ if(!basegfx::fTools::equalZero(fBmpWidthM) && !basegfx::fTools::equalZero(fBmpHeightM))
+ {
+ aHeader.nXPelsPerMeter = basegfx::fround(rAcc.Width() / fabs(fBmpWidthM));
+ aHeader.nYPelsPerMeter = basegfx::fround(rAcc.Height() / fabs(fBmpHeightM));
+ }
+ }
+
+ aHeader.nColsUsed = ((!pAccAlpha && aHeader.nBitCount <= 8) ? rAcc.GetPaletteEntryCount() : 0);
+ aHeader.nColsImportant = 0;
+
+ rOStm.WriteUInt32( aHeader.nSize );
+ rOStm.WriteInt32( aHeader.nWidth );
+ rOStm.WriteInt32( aHeader.nHeight );
+ rOStm.WriteUInt16( aHeader.nPlanes );
+ rOStm.WriteUInt16( aHeader.nBitCount );
+ rOStm.WriteUInt32( aHeader.nCompression );
+
+ nImageSizePos = rOStm.Tell();
+ rOStm.SeekRel( sizeof( aHeader.nSizeImage ) );
+
+ rOStm.WriteInt32( aHeader.nXPelsPerMeter );
+ rOStm.WriteInt32( aHeader.nYPelsPerMeter );
+ rOStm.WriteUInt32( aHeader.nColsUsed );
+ rOStm.WriteUInt32( aHeader.nColsImportant );
+
+ if(pAccAlpha) // only write DIBV5 when asked to do so
+ {
+ aHeader.nV5CSType = 0x57696E20; // LCS_WINDOWS_COLOR_SPACE
+ aHeader.nV5Intent = 0x00000004; // LCS_GM_IMAGES
+
+ rOStm.WriteUInt32( aHeader.nV5RedMask );
+ rOStm.WriteUInt32( aHeader.nV5GreenMask );
+ rOStm.WriteUInt32( aHeader.nV5BlueMask );
+ rOStm.WriteUInt32( aHeader.nV5AlphaMask );
+ rOStm.WriteUInt32( aHeader.nV5CSType );
+
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzRed.aXyzX );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzRed.aXyzY );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzRed.aXyzZ );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzGreen.aXyzX );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzGreen.aXyzY );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzGreen.aXyzZ );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzBlue.aXyzX );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzBlue.aXyzY );
+ rOStm.WriteInt32( aHeader.aV5Endpoints.aXyzBlue.aXyzZ );
+
+ rOStm.WriteUInt32( aHeader.nV5GammaRed );
+ rOStm.WriteUInt32( aHeader.nV5GammaGreen );
+ rOStm.WriteUInt32( aHeader.nV5GammaBlue );
+ rOStm.WriteUInt32( aHeader.nV5Intent );
+ rOStm.WriteUInt32( aHeader.nV5ProfileData );
+ rOStm.WriteUInt32( aHeader.nV5ProfileSize );
+ rOStm.WriteUInt32( aHeader.nV5Reserved );
+ }
+
+ if(ZCOMPRESS == aHeader.nCompression)
+ {
+ ZCodec aCodec;
+ SvMemoryStream aMemStm(aHeader.nSizeImage + 4096, 65535);
+ sal_uInt64 nCodedPos(rOStm.Tell());
+ sal_uInt64 nLastPos(0);
+ sal_uInt32 nCodedSize(0);
+ sal_uInt32 nUncodedSize(0);
+
+ // write uncoded data palette
+ if(aHeader.nColsUsed)
+ {
+ ImplWriteDIBPalette(aMemStm, rAcc);
+ }
+
+ // write uncoded bits
+ bRet = ImplWriteDIBBits(aMemStm, rAcc, pAccAlpha, nCompression, aHeader.nSizeImage);
+
+ // get uncoded size
+ nUncodedSize = aMemStm.Tell();
+
+ // seek over compress info
+ rOStm.SeekRel(12);
+
+ // write compressed data
+ aCodec.BeginCompression(3);
+ aCodec.Write(rOStm, static_cast<sal_uInt8 const *>(aMemStm.GetData()), nUncodedSize);
+ aCodec.EndCompression();
+
+ // update compress info ( coded size, uncoded size, uncoded compression )
+ nLastPos = rOStm.Tell();
+ nCodedSize = nLastPos - nCodedPos - 12;
+ rOStm.Seek(nCodedPos);
+ rOStm.WriteUInt32( nCodedSize ).WriteUInt32( nUncodedSize ).WriteUInt32( nCompression );
+ rOStm.Seek(nLastPos);
+
+ if(bRet)
+ {
+ bRet = (ERRCODE_NONE == rOStm.GetError());
+ }
+ }
+ else
+ {
+ if(aHeader.nColsUsed)
+ {
+ ImplWriteDIBPalette(rOStm, rAcc);
+ }
+
+ bRet = ImplWriteDIBBits(rOStm, rAcc, pAccAlpha, aHeader.nCompression, aHeader.nSizeImage);
+ }
+
+ nEndPos = rOStm.Tell();
+ rOStm.Seek(nImageSizePos);
+ rOStm.WriteUInt32( aHeader.nSizeImage );
+ rOStm.Seek(nEndPos);
+
+ return bRet;
+}
+
+bool ImplWriteDIBFileHeader(SvStream& rOStm, BitmapReadAccess const & rAcc)
+{
+ const sal_uInt32 nPalCount((rAcc.HasPalette() ? rAcc.GetPaletteEntryCount() : isBitfieldCompression(rAcc.GetScanlineFormat()) ? 3UL : 0UL));
+ const sal_uInt32 nOffset(14 + DIBINFOHEADERSIZE + nPalCount * 4UL);
+
+ rOStm.WriteUInt16( 0x4D42 ); // 'MB' from BITMAPFILEHEADER
+ rOStm.WriteUInt32( nOffset + (rAcc.Height() * rAcc.GetScanlineSize()) );
+ rOStm.WriteUInt16( 0 );
+ rOStm.WriteUInt16( 0 );
+ rOStm.WriteUInt32( nOffset );
+
+ return rOStm.GetError() == ERRCODE_NONE;
+}
+
+bool ImplReadDIB(
+ Bitmap& rTarget,
+ AlphaMask* pTargetAlpha,
+ SvStream& rIStm,
+ bool bFileHeader,
+ bool bIsMask=false,
+ bool bMSOFormat=false)
+{
+ const SvStreamEndian nOldFormat(rIStm.GetEndian());
+ const auto nOldPos(rIStm.Tell());
+ sal_uLong nOffset(0);
+ bool bRet(false);
+
+ rIStm.SetEndian(SvStreamEndian::LITTLE);
+
+ if(bFileHeader)
+ {
+ if(ImplReadDIBFileHeader(rIStm, nOffset))
+ {
+ bRet = ImplReadDIBBody(rIStm, rTarget, nOffset >= DIBV5HEADERSIZE ? pTargetAlpha : nullptr, nOffset, bIsMask, bMSOFormat);
+ }
+ }
+ else
+ {
+ bRet = ImplReadDIBBody(rIStm, rTarget, nullptr, nOffset, bIsMask, bMSOFormat);
+ }
+
+ if(!bRet)
+ {
+ if(!rIStm.GetError()) // Set error and stop processing whole stream due to security reason
+ {
+ rIStm.SetError(SVSTREAM_GENERALERROR);
+ }
+
+ rIStm.Seek(nOldPos);
+ }
+
+ rIStm.SetEndian(nOldFormat);
+
+ return bRet;
+}
+
+bool ImplWriteDIB(
+ const Bitmap& rSource,
+ SvStream& rOStm,
+ bool bCompressed,
+ bool bFileHeader)
+{
+ const Size aSizePix(rSource.GetSizePixel());
+ bool bRet(false);
+
+ if(aSizePix.Width() && aSizePix.Height())
+ {
+ Bitmap::ScopedReadAccess pAcc(const_cast< Bitmap& >(rSource));
+ Bitmap::ScopedReadAccess pAccAlpha;
+ const SvStreamEndian nOldFormat(rOStm.GetEndian());
+ const sal_uInt64 nOldPos(rOStm.Tell());
+
+ rOStm.SetEndian(SvStreamEndian::LITTLE);
+
+ if (pAcc)
+ {
+ if(bFileHeader)
+ {
+ if(ImplWriteDIBFileHeader(rOStm, *pAcc))
+ {
+ bRet = ImplWriteDIBBody(rSource, rOStm, *pAcc, pAccAlpha.get(), bCompressed);
+ }
+ }
+ else
+ {
+ bRet = ImplWriteDIBBody(rSource, rOStm, *pAcc, pAccAlpha.get(), bCompressed);
+ }
+
+ pAcc.reset();
+ }
+
+ pAccAlpha.reset();
+
+ if(!bRet)
+ {
+ rOStm.SetError(SVSTREAM_GENERALERROR);
+ rOStm.Seek(nOldPos);
+ }
+
+ rOStm.SetEndian(nOldFormat);
+ }
+
+ return bRet;
+}
+
+} // unnamed namespace
+
+bool ReadDIB(
+ Bitmap& rTarget,
+ SvStream& rIStm,
+ bool bFileHeader,
+ bool bMSOFormat)
+{
+ return ImplReadDIB(rTarget, nullptr, rIStm, bFileHeader, false, bMSOFormat);
+}
+
+bool ReadDIBBitmapEx(
+ BitmapEx& rTarget,
+ SvStream& rIStm,
+ bool bFileHeader,
+ bool bMSOFormat)
+{
+ Bitmap aBmp;
+ bool bRetval(ImplReadDIB(aBmp, nullptr, rIStm, bFileHeader, /*bMask*/false, bMSOFormat) && !rIStm.GetError());
+
+ if(bRetval)
+ {
+ // base bitmap was read, set as return value and try to read alpha extra-data
+ const sal_uInt64 nStmPos(rIStm.Tell());
+ sal_uInt32 nMagic1(0);
+ sal_uInt32 nMagic2(0);
+
+ rTarget = BitmapEx(aBmp);
+ if (rIStm.remainingSize() >= 4)
+ rIStm.ReadUInt32( nMagic1 ).ReadUInt32( nMagic2 );
+ bRetval = (0x25091962 == nMagic1) && (0xACB20201 == nMagic2) && !rIStm.GetError();
+
+ if(bRetval)
+ {
+ sal_uInt8 tmp = 0;
+ rIStm.ReadUChar( tmp );
+ bRetval = !rIStm.GetError();
+
+ if(bRetval)
+ {
+ switch (tmp)
+ {
+ case 2: // TransparentType::Bitmap
+ {
+ Bitmap aMask;
+
+ bRetval = ImplReadDIB(aMask, nullptr, rIStm, true, true);
+
+ if(bRetval)
+ {
+ if(!aMask.IsEmpty())
+ {
+ // do we have an alpha mask?
+ if (aMask.getPixelFormat() == vcl::PixelFormat::N8_BPP && aMask.HasGreyPalette8Bit())
+ {
+ AlphaMask aAlpha;
+
+ // create alpha mask quickly (without greyscale conversion)
+ aAlpha.ImplSetBitmap(aMask);
+ rTarget = BitmapEx(aBmp, aAlpha);
+ }
+ else
+ {
+ rTarget = BitmapEx(aBmp, aMask);
+ }
+ }
+ }
+ break;
+ }
+ case 1: // backwards compat for old option TransparentType::Color
+ {
+ Color aTransparentColor;
+
+ tools::GenericTypeSerializer aSerializer(rIStm);
+ aSerializer.readColor(aTransparentColor);
+
+ bRetval = rIStm.good();
+
+ if(bRetval)
+ {
+ rTarget = BitmapEx(aBmp, aTransparentColor);
+ }
+ break;
+ }
+ default: break;
+ }
+ }
+ }
+
+ if(!bRetval)
+ {
+ // alpha extra data could not be read; reset, but use base bitmap as result
+ rIStm.ResetError();
+ rIStm.Seek(nStmPos);
+ bRetval = true;
+ }
+ }
+
+ return bRetval;
+}
+
+bool ReadDIBV5(
+ Bitmap& rTarget,
+ AlphaMask& rTargetAlpha,
+ SvStream& rIStm)
+{
+ return ImplReadDIB(rTarget, &rTargetAlpha, rIStm, true);
+}
+
+bool ReadRawDIB(
+ BitmapEx& rTarget,
+ const unsigned char* pBuf,
+ const ScanlineFormat nFormat,
+ const int nHeight,
+ const int nStride)
+{
+ BitmapScopedWriteAccess pWriteAccess(rTarget.maBitmap.AcquireWriteAccess(), rTarget.maBitmap);
+ for (int nRow = 0; nRow < nHeight; ++nRow)
+ {
+ pWriteAccess->CopyScanline(nRow, pBuf + (nStride * nRow), nFormat, nStride);
+ }
+
+ return true;
+}
+
+bool WriteDIB(
+ const Bitmap& rSource,
+ SvStream& rOStm,
+ bool bCompressed,
+ bool bFileHeader)
+{
+ return ImplWriteDIB(rSource, rOStm, bCompressed, bFileHeader);
+}
+
+bool WriteDIB(
+ const BitmapEx& rSource,
+ SvStream& rOStm,
+ bool bCompressed)
+{
+ return ImplWriteDIB(rSource.GetBitmap(), rOStm, bCompressed, /*bFileHeader*/true);
+}
+
+bool WriteDIBBitmapEx(
+ const BitmapEx& rSource,
+ SvStream& rOStm)
+{
+ if(ImplWriteDIB(rSource.GetBitmap(), rOStm, true, true))
+ {
+ rOStm.WriteUInt32( 0x25091962 );
+ rOStm.WriteUInt32( 0xACB20201 );
+ rOStm.WriteUChar( rSource.IsAlpha() ? 2 : 0 ); // Used to be TransparentType enum
+
+ if(rSource.IsAlpha())
+ {
+ return ImplWriteDIB(rSource.maAlphaMask, rOStm, true, true);
+ }
+ }
+
+ return false;
+}
+
+sal_uInt32 getDIBV5HeaderSize()
+{
+ return DIBV5HEADERSIZE;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 08:07:26 +0000