LibreOffice Module sdext (master)  1
pnghelper.hxx
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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: */
static void set(sal_uInt32 i_nValue, OutputBuffer &o_rOutputBuf, size_t i_nIndex)
Definition: pnghelper.cxx:134
static void append(sal_uInt32 i_nValue, OutputBuffer &o_rOutputBuf)
Definition: pnghelper.hxx:40
static sal_uInt32 deflateBuffer(const Output_t *i_pBuf, size_t i_nLen, OutputBuffer &o_rOut)
Definition: pnghelper.cxx:76
static void initCRCTable()
Definition: pnghelper.cxx:36
static void appendIHDR(OutputBuffer &o_rOutputBuf, int width, int height, int depth, int colortype)
Definition: pnghelper.cxx:157
static void endChunk(size_t nStart, OutputBuffer &o_rOut)
Definition: pnghelper.cxx:142
static void appendIEND(OutputBuffer &o_rOutputBuf)
Definition: pnghelper.cxx:170
static bool bCRCTableInit
Definition: pnghelper.hxx:32
unsigned char Output_t
std::vector< Output_t > OutputBuffer
static void createPng(OutputBuffer &o_rOutputBuf, Stream *str, int width, int height, GfxRGB const &zeroColor, GfxRGB const &oneColor, bool bIsMask)
Definition: pnghelper.cxx:176
static void updateCRC(sal_uInt32 &io_rCRC, const sal_uInt8 *i_pBuf, size_t i_nLen)
Definition: pnghelper.cxx:58
static size_t startChunk(const char *pChunkName, OutputBuffer &o_rOut)
Definition: pnghelper.cxx:123
unsigned char sal_uInt8
static sal_uInt32 getCRC(const sal_uInt8 *i_pBuf, size_t i_nLen)
Definition: pnghelper.cxx:69
static void appendFileHeader(OutputBuffer &o_rOutputBuf)
Definition: pnghelper.cxx:116
static sal_uInt32 crc_table[256]
Definition: pnghelper.hxx:31