tjpgd.h

/*----------------------------------------------------------------------------/
/ TJpgDec - Tiny JPEG Decompressor include file               (C)ChaN, 2019
/----------------------------------------------------------------------------*/
#ifndef DEF_TJPGDEC
#define DEF_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 */
#ifdef ESP32 // Table gives no speed mprovement for ESP32
  #define JD_TBLCLIP    0   /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */
#else
  #define JD_TBLCLIP    1   /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */
#endif
/*---------------------------------------------------------------------------*/

#ifdef __cplusplus
extern "C" {
#endif

#include "stdint.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 {
    uint16_t left, right, top, bottom;
} JRECT;



/* Decompressor object structure */
typedef struct JDEC_s JDEC;
struct JDEC_s {
    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];          /* Dequantizer 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*, uint8_t*, uint16_t);/* Pointer to jpeg stream input function */
    void* device;               /* Pointer to I/O device identifiler for the session */
	uint8_t swap;               /* Added by Bodmer to control byte swapping */
};

/* TJpgDec API functions */
JRESULT jd_prepare (JDEC*, uint16_t(*)(JDEC*,uint8_t*,uint16_t), void*, uint16_t, void*);
JRESULT jd_decomp (JDEC*, uint16_t(*)(JDEC*,void*,JRECT*), uint8_t);


#ifdef __cplusplus
}
#endif

#endif /* _TJPGDEC */