tjpgd.h

/*----------------------------------------------------------------------------/
/ TJpgDec - Tiny JPEG Decompressor R0.03 include file         (C)ChaN, 2021
/----------------------------------------------------------------------------*/
#ifndef DEF_TJPGDEC
#define DEF_TJPGDEC
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "../../../lv_conf_internal.h"
#if LV_USE_SJPG
 
#include "tjpgdcnf.h"
#include <string.h>
#include <stdint.h>
 
#if JD_FASTDECODE >= 1
typedef int16_t jd_yuv_t;
#else
typedef uint8_t jd_yuv_t;
#endif
 
 
/* 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 broken data) */
    JDR_FMT2,   /* 7: Right format but not supported */
    JDR_FMT3    /* 8: Not supported JPEG standard */
} JRESULT;
 
/* Rectangular region in the output image */
typedef struct {
    uint16_t left;      /* Left end */
    uint16_t right;     /* Right end */
    uint16_t top;       /* Top end */
    uint16_t bottom;    /* Bottom end */
} JRECT;
 
/* Decompressor object structure */
typedef struct JDEC JDEC;
struct JDEC {
    size_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 dbit;               /* Number of bits availavble in wreg or reading bit mask */
    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, Y, Cb, Cr */
    uint8_t ncomp;              /* Number of color components 1:grayscale, 3:color */
    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] */
#if JD_FASTDECODE >= 1
    uint32_t wreg;              /* Working shift register */
    uint8_t marker;             /* Detected marker (0:None) */
#if JD_FASTDECODE == 2
    uint8_t longofs[2][2];      /* Table offset of long code [id][dcac] */
    uint16_t* hufflut_ac[2];    /* Fast huffman decode tables for AC short code [id] */
    uint8_t* hufflut_dc[2];     /* Fast huffman decode tables for DC short code [id] */
#endif
#endif
    void* workbuf;              /* Working buffer for IDCT and RGB output */
    jd_yuv_t* mcubuf;           /* Working buffer for the MCU */
    void* pool;                 /* Pointer to available memory pool */
    size_t sz_pool;             /* Size of momory pool (bytes available) */
    size_t (*infunc)(JDEC*, uint8_t*, size_t);  /* Pointer to jpeg stream input function */
    void* device;               /* Pointer to I/O device identifiler for the session */
};
 
 
 
/* TJpgDec API functions */
JRESULT jd_prepare (JDEC* jd, size_t (*infunc)(JDEC*,uint8_t*,size_t), void* pool, size_t sz_pool, void* dev);
JRESULT jd_decomp (JDEC* jd, int (*outfunc)(JDEC*,void*,JRECT*), uint8_t scale);
 
#endif /*LV_USE_SJPG*/
 
#ifdef __cplusplus
}
#endif
 
#endif /* _TJPGDEC */