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42 #ifndef _GRFMT_JPEG_H_
43 #define _GRFMT_JPEG_H_
45 #include "grfmt_base.h"
50 /* IJG-based version */
52 class GrFmtJpegReader : public GrFmtReader
56 GrFmtJpegReader( const char* filename );
59 bool ReadData( uchar* data, int step, int color );
65 void* m_cinfo; // pointer to IJG JPEG codec structure
66 void* m_jerr; // pointer to error processing manager state
71 class GrFmtJpegWriter : public GrFmtWriter
75 GrFmtJpegWriter( const char* filename );
78 bool WriteImage( const uchar* data, int step,
79 int width, int height, int depth, int channels );
84 /* hand-crafted implementation */
86 class RJpegBitStream : public RMBitStream
89 RMByteStream m_low_strm;
94 virtual bool Open( const char* filename );
97 void Flush(); // flushes high-level bit stream
102 virtual void ReadBlock();
106 //////////////////// JPEG reader /////////////////////
108 class GrFmtJpegReader : public GrFmtReader
112 GrFmtJpegReader( const char* filename );
115 bool ReadData( uchar* data, int step, int color );
121 int m_offset; // offset of first scan
122 int m_version; // JFIF version
123 int m_planes; // 3 (YCrCb) or 1 (Gray)
124 int m_precision; // 8 or 12-bit per sample
125 int m_type; // SOF type
126 int m_MCUs; // MCUs in restart interval
127 int m_ss, m_se, m_ah, m_al; // progressive JPEG parameters
129 // information about each component
132 char h; // horizontal sampling factor
133 char v; // vertical sampling factor
134 char tq; // quantization table index
135 char td, ta; // DC & AC huffman tables
136 int dc_pred; // DC predictor
150 RJpegBitStream m_strm;
154 bool LoadQuantTables( int length );
155 bool LoadHuffmanTables( int length );
156 void ProcessScan( int* idx, int ns, uchar* data, int step, int color );
158 void GetBlock( int* block, int c );
162 //////////////////// JPEG-specific output bitstream ///////////////////////
164 class WJpegBitStream : public WMBitStream
167 WMByteStream m_low_strm;
172 virtual void Flush();
173 virtual bool Open( const char* filename );
174 virtual void Close();
177 virtual void WriteBlock();
181 //////////////////// JPEG reader /////////////////////
183 class GrFmtJpegWriter : public GrFmtWriter
187 GrFmtJpegWriter( const char* filename );
190 bool WriteImage( const uchar* data, int step,
191 int width, int height, int depth, int channels );
195 WJpegBitStream m_strm;
198 #endif /* HAVE_JPEG */
201 // JPEG filter factory
202 class GrFmtJpeg : public GrFmtFilterFactory
209 GrFmtReader* NewReader( const char* filename );
210 GrFmtWriter* NewWriter( const char* filename );
214 #endif/*_GRFMT_JPEG_H_*/