LuatOS/components/tjpgd/tjpgd.h

/*----------------------------------------------------------------------------/
/ TJpgDec - Tiny JPEG Decompressor include file               (C)ChaN, 2020
/----------------------------------------------------------------------------*/
#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 */
#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

#if defined(_WIN32)	/* Main development platform */
typedef unsigned char	uint8_t;
typedef unsigned short	uint16_t;
typedef short			int16_t;
typedef unsigned long	uint32_t;
typedef long			int32_t;
#else
#include "stdint.h"
#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 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 JDEC;
struct JDEC {
	unsigned int 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 */
	unsigned int sz_pool;		/* Size of momory pool (bytes available) */
	unsigned int (*infunc)(JDEC*, uint8_t*, unsigned int);	/* 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, unsigned int (*infunc)(JDEC*,uint8_t*,unsigned int), void* pool, unsigned int sz_pool, void* dev);
JRESULT jd_decomp (JDEC* jd, int (*outfunc)(JDEC*,void*,JRECT*), uint8_t scale);


#ifdef __cplusplus
}
#endif

#endif /* _TJPGDEC */