working together with FATFileSystem

Fork of TinyJpgDec by Helmut Schmücker

TinyJpgDec.h

Committer:
humlet
Date:
2014-03-22
Revision:
0:b6f284347a66
Child:
1:79e97662234d

File content as of revision 0:b6f284347a66:

/*----------------------------------------------------------------------------/
/ 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 */