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tjpgd.h
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/*----------------------------------------------------------------------------/
/ TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2012
/----------------------------------------------------------------------------*/
#ifndef _TJPGDEC
#define _TJPGDEC
/*---------------------------------------------------------------------------*/
/* System Configurations */
#define JD_SZBUF 512 /* 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 */