sdext/source/pdfimport/xpdfwrapper/pnghelper.hxx

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  30 #ifndef _IPDF_PNGHELPER_HXX
  31 #define _IPDF_PNGHELPER_HXX
  32
  33 #include "sal/types.h"
  34 #include "pdfioutdev_gpl.hxx"
  35
  36
  37 namespace pdfi
  38 {
  39     class PngHelper
  40     {
  41         static sal_uInt32 crc_table[ 256 ];
  42         static bool bCRCTableInit;
  43
  44         static void initCRCTable();
  45         static void appendFileHeader( OutputBuffer& o_rOutputBuf );
  46         static size_t startChunk( const char* pChunkName, OutputBuffer& o_rOut );
  47         static void endChunk( size_t nStart, OutputBuffer& o_rOut );
  48
  49         static void set( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf, size_t i_nIndex );
  50         static void append( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf )
  51         {
  52             size_t nCur = o_rOutputBuf.size();
  53             o_rOutputBuf.insert( o_rOutputBuf.end(), 4, (Output_t)0 );
  54             set( i_nValue, o_rOutputBuf, nCur );
  55         }
  56
  57         static void appendIHDR( OutputBuffer& o_rOutputBuf, int width, int height, int depth, int colortype );
  58         static void appendIEND( OutputBuffer& o_rOutputBuf );
  59
  60     public:
  61         static void updateCRC( sal_uInt32& io_rCRC, const sal_uInt8* i_pBuf, size_t i_nLen );
  62         static sal_uInt32 getCRC( const sal_uInt8* i_pBuf, size_t i_nLen );
  63
  64         // deflates the passed buff i_pBuf and appends it to the output vector
  65         // returns the number of bytes added to the output
  66         static sal_uInt32 deflateBuffer( const Output_t* i_pBuf, size_t i_nLen, OutputBuffer& o_rOut );
  67
  68         static void createPng( OutputBuffer&     o_rOutputBuf,
  69                                Stream*           str,
  70                                int               width,
  71                                int               height,
  72                                GfxRGB&           zeroColor,
  73                                GfxRGB&           oneColor,
  74                                bool              bIsMask
  75                                );
  76         static void createPng( OutputBuffer& o_rOutputBuf,
  77                                Stream* str,
  78                                int width, int height, GfxImageColorMap* colorMap,
  79                                Stream* maskStr,
  80                                int maskWidth, int maskHeight, GfxImageColorMap* maskColorMap );
  81
  82         // for one bit masks
  83         static void createPng( OutputBuffer& o_rOutputBuf,
  84                                Stream* str,
  85                                int width, int height, GfxImageColorMap* colorMap,
  86                                Stream* maskStr,
  87                                int maskWidth, int maskHeight, bool maskInvert );
  88
  89     };
  90 }
  91
  92 #endif