98 lines
3.6 KiB
C
98 lines
3.6 KiB
C
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/*----------------------------------------------------------------------------/
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/ TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2012
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/----------------------------------------------------------------------------*/
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#ifndef _TJPGDEC
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#define _TJPGDEC
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/*---------------------------------------------------------------------------*/
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/* System Configurations */
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#define JD_SZBUF 512 /* Size of stream input buffer */
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#define JD_FORMAT 0 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */
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#define JD_USE_SCALE 1 /* Use descaling feature for output */
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#define JD_TBLCLIP 1 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */
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/*---------------------------------------------------------------------------*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* These types must be 16-bit, 32-bit or larger integer */
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typedef int INT;
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typedef unsigned int UINT;
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/* These types must be 8-bit integer */
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typedef char CHAR;
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typedef unsigned char UCHAR;
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typedef unsigned char BYTE;
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/* These types must be 16-bit integer */
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typedef short SHORT;
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typedef unsigned short USHORT;
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typedef unsigned short WORD;
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typedef unsigned short WCHAR;
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/* These types must be 32-bit integer */
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typedef long LONG;
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typedef unsigned long ULONG;
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typedef unsigned long DWORD;
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/* Error code */
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typedef enum {
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JDR_OK = 0, /* 0: Succeeded */
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JDR_INTR, /* 1: Interrupted by output function */
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JDR_INP, /* 2: Device error or wrong termination of input stream */
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JDR_MEM1, /* 3: Insufficient memory pool for the image */
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JDR_MEM2, /* 4: Insufficient stream input buffer */
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JDR_PAR, /* 5: Parameter error */
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JDR_FMT1, /* 6: Data format error (may be damaged data) */
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JDR_FMT2, /* 7: Right format but not supported */
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JDR_FMT3 /* 8: Not supported JPEG standard */
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} JRESULT;
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/* Rectangular structure */
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typedef struct {
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WORD left, right, top, bottom;
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} JRECT;
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/* Decompressor object structure */
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typedef struct JDEC JDEC;
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struct JDEC {
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UINT dctr; /* Number of bytes available in the input buffer */
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BYTE *dptr; /* Current data read ptr */
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BYTE *inbuf; /* Bit stream input buffer */
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BYTE dmsk; /* Current bit in the current read byte */
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BYTE scale; /* Output scaling ratio */
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BYTE msx, msy; /* MCU size in unit of block (width, height) */
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BYTE qtid[3]; /* Quantization table ID of each component */
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SHORT dcv[3]; /* Previous DC element of each component */
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WORD nrst; /* Restart inverval */
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UINT width, height; /* Size of the input image (pixel) */
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BYTE *huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */
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WORD *huffcode[2][2]; /* Huffman code word tables [id][dcac] */
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BYTE *huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */
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LONG *qttbl[4]; /* Dequaitizer tables [id] */
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void *workbuf; /* Working buffer for IDCT and RGB output */
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BYTE *mcubuf; /* Working buffer for the MCU */
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void *pool; /* Pointer to available memory pool */
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UINT sz_pool; /* Size of momory pool (bytes available) */
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UINT (*infunc)(JDEC *, BYTE *, UINT); /* Pointer to jpeg stream input function */
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void *device; /* Pointer to I/O device identifiler for the session */
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};
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/* TJpgDec API functions */
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JRESULT jd_prepare (JDEC *, UINT(*)(JDEC *, BYTE *, UINT), void *, UINT, void *);
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JRESULT jd_decomp (JDEC *, UINT(*)(JDEC *, void *, JRECT *), BYTE);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _TJPGDEC */
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