inkplate-6-arduino-library/tjpgd.h

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/*----------------------------------------------------------------------------/
/ 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
#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_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 */
void* _display;
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uint8_t _dither;
uint8_t _invert;
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};
/* TJpgDec API functions */
JRESULT jd_prepare (JDEC*, uint16_t(*)(JDEC*,uint8_t*,uint16_t), void*, uint16_t, void*);
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JRESULT jd_decomp (JDEC*, uint16_t(*)(JDEC*,void*,JRECT*), uint8_t, void*, uint8_t, uint8_t);
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#ifdef __cplusplus
}
#endif
#endif /* _TJPGDEC */