1 /*----------------------------------------------------------------------------/ 2 / TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2012 3 /----------------------------------------------------------------------------*/ 4 #ifndef _TJPGDEC 5 #define _TJPGDEC 6 /*---------------------------------------------------------------------------*/ 7 /* System Configurations */ 8 9 #define JD_SZBUF 512 /* Size of stream input buffer */ 10 #define JD_FORMAT 0 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */ 11 #define JD_USE_SCALE 1 /* Use descaling feature for output */ 12 #define JD_TBLCLIP 1 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */ 13 14 /*---------------------------------------------------------------------------*/ 15 16 #ifdef __cplusplus 17 extern "C" { 18 #endif 19 20 /* These types must be 16-bit, 32-bit or larger integer */ 21 typedef int INT; 22 typedef unsigned int UINT; 23 24 /* These types must be 8-bit integer */ 25 typedef char CHAR; 26 typedef unsigned char UCHAR; 27 typedef unsigned char BYTE; 28 29 /* These types must be 16-bit integer */ 30 typedef short SHORT; 31 typedef unsigned short USHORT; 32 typedef unsigned short WORD; 33 typedef unsigned short WCHAR; 34 35 /* These types must be 32-bit integer */ 36 typedef long LONG; 37 typedef unsigned long ULONG; 38 typedef unsigned long DWORD; 39 40 41 /* Error code */ 42 typedef enum { 43 JDR_OK = 0, /* 0: Succeeded */ 44 JDR_INTR, /* 1: Interrupted by output function */ 45 JDR_INP, /* 2: Device error or wrong termination of input stream */ 46 JDR_MEM1, /* 3: Insufficient memory pool for the image */ 47 JDR_MEM2, /* 4: Insufficient stream input buffer */ 48 JDR_PAR, /* 5: Parameter error */ 49 JDR_FMT1, /* 6: Data format error (may be damaged data) */ 50 JDR_FMT2, /* 7: Right format but not supported */ 51 JDR_FMT3 /* 8: Not supported JPEG standard */ 52 } JRESULT; 53 54 55 56 /* Rectangular structure */ 57 typedef struct { 58 WORD left, right, top, bottom; 59 } JRECT; 60 61 62 63 /* Decompressor object structure */ 64 typedef struct JDEC JDEC; 65 struct JDEC { 66 UINT dctr; /* Number of bytes available in the input buffer */ 67 BYTE* dptr; /* Current data read ptr */ 68 BYTE* inbuf; /* Bit stream input buffer */ 69 BYTE dmsk; /* Current bit in the current read byte */ 70 BYTE scale; /* Output scaling ratio */ 71 BYTE msx, msy; /* MCU size in unit of block (width, height) */ 72 BYTE qtid[3]; /* Quantization table ID of each component */ 73 SHORT dcv[3]; /* Previous DC element of each component */ 74 WORD nrst; /* Restart inverval */ 75 UINT width, height; /* Size of the input image (pixel) */ 76 BYTE* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */ 77 WORD* huffcode[2][2]; /* Huffman code word tables [id][dcac] */ 78 BYTE* huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */ 79 LONG* qttbl[4]; /* Dequaitizer tables [id] */ 80 void* workbuf; /* Working buffer for IDCT and RGB output */ 81 BYTE* mcubuf; /* Working buffer for the MCU */ 82 void* pool; /* Pointer to available memory pool */ 83 UINT sz_pool; /* Size of momory pool (bytes available) */ 84 UINT (*infunc)(JDEC*, BYTE*, UINT);/* Pointer to jpeg stream input function */ 85 void* device; /* Pointer to I/O device identifiler for the session */ 86 }; 87 88 89 90 /* TJpgDec API functions */ 91 JRESULT jd_prepare (JDEC*, UINT(*)(JDEC*,BYTE*,UINT), void*, UINT, void*); 92 JRESULT jd_decomp (JDEC*, UINT(*)(JDEC*,void*,JRECT*), BYTE); 93 94 95 #ifdef __cplusplus 96 } 97 #endif 98 99 #endif /* _TJPGDEC */ 100
