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Diff: TinyJpgDec.h
- Revision:
- 0:b6f284347a66
- Child:
- 1:79e97662234d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TinyJpgDec.h Sat Mar 22 18:00:42 2014 +0000 @@ -0,0 +1,82 @@ +/*----------------------------------------------------------------------------/ +/ TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2012 +/----------------------------------------------------------------------------*/ +#ifndef _TJPGDEC +#define _TJPGDEC +/*---------------------------------------------------------------------------*/ +/* System Configurations */ + +#define JD_SZBUF 1024 /* Size of stream input buffer */ +#define JD_FORMAT 1 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */ +#define JD_USE_SCALE 1 /* Use descaling feature for output */ +#define JD_TBLCLIP 1 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */ + +/*---------------------------------------------------------------------------*/ + +#ifdef __cplusplus +extern "C" { +#endif + +#include "integer.h" + + + /* Error code */ + typedef enum { + JDR_OK = 0, /* 0: Succeeded */ + JDR_INTR, /* 1: Interrupted by output function */ + JDR_INP, /* 2: Device error or wrong termination of input stream */ + JDR_MEM1, /* 3: Insufficient memory pool for the image */ + JDR_MEM2, /* 4: Insufficient stream input buffer */ + JDR_PAR, /* 5: Parameter error */ + JDR_FMT1, /* 6: Data format error (may be damaged data) */ + JDR_FMT2, /* 7: Right format but not supported */ + JDR_FMT3 /* 8: Not supported JPEG standard */ + } + JRESULT; + + + + /* Rectangular structure */ + typedef struct { + WORD left, right, top, bottom; + } JRECT; + + + + /* Decompressor object structure */ + typedef struct JDEC JDEC; + struct JDEC { + UINT dctr; /* Number of bytes available in the input buffer */ + BYTE* dptr; /* Current data read ptr */ + BYTE* inbuf; /* Bit stream input buffer */ + BYTE dmsk; /* Current bit in the current read byte */ + BYTE scale; /* Output scaling ratio */ + BYTE msx, msy; /* MCU size in unit of block (width, height) */ + BYTE qtid[3]; /* Quantization table ID of each component */ + SHORT dcv[3]; /* Previous DC element of each component */ + WORD nrst; /* Restart inverval */ + UINT width, height; /* Size of the input image (pixel) */ + BYTE* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */ + WORD* huffcode[2][2]; /* Huffman code word tables [id][dcac] */ + BYTE* huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */ + LONG* qttbl[4]; /* Dequaitizer tables [id] */ + void* workbuf; /* Working buffer for IDCT and RGB output */ + BYTE* mcubuf; /* Working buffer for the MCU */ + void* pool; /* Pointer to available memory pool */ + UINT sz_pool; /* Size of momory pool (bytes available) */ + UINT (*infunc)(JDEC*, BYTE*, UINT);/* Pointer to jpeg stream input function */ + void* device; /* Pointer to I/O device identifiler for the session */ + }; + + + + /* TJpgDec API functions */ + JRESULT jd_prepare (JDEC*, UINT(*)(JDEC*,BYTE*,UINT), void*, UINT, void*); + JRESULT jd_decomp (JDEC*, UINT(*)(JDEC*,void*,JRECT*), BYTE); + + +#ifdef __cplusplus +} +#endif + +#endif /* _TJPGDEC */