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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
93