File content as of revision 115:c9862fd0c689:

/// Wrapping ChaN's TJpgDec into this graphics engine
///

#ifndef GraphicsDisplayJPEG_H
#define GraphicsDisplayJPEG_H

/*----------------------------------------------------------------------------/
/ 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) */

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

#include "DisplayDefs.h"

/* Error code */
typedef enum {
    JDR_OK = noerror, /* 0: Succeeded */
    JDR_INTR = external_abort,   /* 1: Interrupted by output function */ 
    JDR_INP = bad_parameter,    /* 2: Device error or wrong termination of input stream */
    JDR_MEM1 = not_enough_ram,   /* 3: Insufficient memory pool for the image */
    JDR_MEM2 = not_enough_ram,   /* 4: Insufficient stream input buffer */
    JDR_PAR = bad_parameter,    /* 5: Parameter error */
    JDR_FMT1 = not_supported_format,   /* 6: Data format error (may be damaged data) */
    JDR_FMT2 = not_supported_format,   /* 7: Right format but not supported */
    JDR_FMT3 = not_supported_format   /* 8: Not supported JPEG standard */
} JRESULT;



/* Rectangular structure */
typedef struct {
    loc_t left, right, top, bottom;
} JRECT;



/* Decompressor object structure */
typedef struct JDEC JDEC;
struct JDEC {
    uint16_t dctr;              /* Number of bytes available in the input buffer */
    uint8_t * dptr;             /* Current data read ptr */
    uint8_t * inbuf;            /* Bit stream input buffer */
    uint8_t dmsk;              /* Current bit in the current read byte */
    uint8_t scale;             /* Output scaling ratio */
    uint8_t msx, msy;          /* MCU size in unit of block (width, height) */
    uint8_t qtid[3];           /* Quantization table ID of each component */
    int16_t dcv[3];           /* Previous DC element of each component */
    uint16_t nrst;              /* Restart inverval */
    uint16_t width, height;     /* Size of the input image (pixel) */
    uint8_t * huffbits[2][2];   /* Huffman bit distribution tables [id][dcac] */
    uint16_t * huffcode[2][2];   /* Huffman code word tables [id][dcac] */
    uint8_t * huffdata[2][2];   /* Huffman decoded data tables [id][dcac] */
    int32_t * qttbl[4];         /* Dequaitizer tables [id] */
    void * workbuf;          /* Working buffer for IDCT and RGB output */
    uint8_t * mcubuf;           /* Working buffer for the MCU */
    void * pool;             /* Pointer to available memory pool */
    uint16_t sz_pool;           /* Size of momory pool (bytes available) */
    uint16_t (*infunc)(JDEC * jd, uint8_t * buffer, uint16_t bufsize);/* Pointer to jpeg stream input function */
    void * device;           /* Pointer to I/O device identifiler for the session */
};


#endif /* _TJPGDEC */

#endif // GraphicsDisplayJPEG_H