sdext/source/pdfimport/xpdfwrapper/pnghelper.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  12  *   contributor license agreements. See the NOTICE file distributed
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  14  *   ownership. The ASF licenses this file to you under the Apache
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  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_XPDFWRAPPER_PNGHELPER_HXX
  21 #define INCLUDED_SDEXT_SOURCE_PDFIMPORT_XPDFWRAPPER_PNGHELPER_HXX
  22
  23 #include <sal/types.h>
  24 #include "pdfioutdev_gpl.hxx"
  25
  26
  27 namespace pdfi
  28 {
  29     class PngHelper
  30     {
  31         static sal_uInt32 crc_table[ 256 ];
  32         static bool bCRCTableInit;
  33
  34         static void initCRCTable();
  35         static void appendFileHeader( OutputBuffer& o_rOutputBuf );
  36         static size_t startChunk( const char* pChunkName, OutputBuffer& o_rOut );
  37         static void endChunk( size_t nStart, OutputBuffer& o_rOut );
  38
  39         static void set( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf, size_t i_nIndex );
  40         static void append( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf )
  41         {
  42             size_t nCur = o_rOutputBuf.size();
  43             o_rOutputBuf.insert( o_rOutputBuf.end(), 4, Output_t(0) );
  44             set( i_nValue, o_rOutputBuf, nCur );
  45         }
  46
  47         static void appendIHDR( OutputBuffer& o_rOutputBuf, int width, int height, int depth, int colortype );
  48         static void appendIEND( OutputBuffer& o_rOutputBuf );
  49
  50     public:
  51         static void updateCRC( sal_uInt32& io_rCRC, const sal_uInt8* i_pBuf, size_t i_nLen );
  52         static sal_uInt32 getCRC( const sal_uInt8* i_pBuf, size_t i_nLen );
  53
  54         // deflates the passed buff i_pBuf and appends it to the output vector
  55         // returns the number of bytes added to the output
  56         static sal_uInt32 deflateBuffer( const Output_t* i_pBuf, size_t i_nLen, OutputBuffer& o_rOut );
  57
  58         static void createPng( OutputBuffer&     o_rOutputBuf,
  59                                Stream*           str,
  60                                int               width,
  61                                int               height,
  62                                GfxRGB const &    zeroColor,
  63                                GfxRGB const &    oneColor,
  64                                bool              bIsMask
  65                                );
  66         static void createPng( OutputBuffer& o_rOutputBuf,
  67                                Stream* str,
  68                                int width, int height, GfxImageColorMap* colorMap,
  69                                Stream* maskStr,
  70                                int maskWidth, int maskHeight, GfxImageColorMap* maskColorMap );
  71
  72         // for one bit masks
  73         static void createPng( OutputBuffer& o_rOutputBuf,
  74                                Stream* str,
  75                                int width, int height, GfxImageColorMap* colorMap,
  76                                Stream* maskStr,
  77                                int maskWidth, int maskHeight, bool maskInvert );
  78
  79     };
  80 }
  81
  82 #endif
  83
  84 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */