1 /*----------------------------------------------------------------------------/ 2 / TJpgDec - Tiny JPEG Decompressor R0.03 include file (C)ChaN, 2021 3 /----------------------------------------------------------------------------*/ 4 #ifndef DEF_TJPGDEC 5 #define DEF_TJPGDEC 6 7 #ifdef __cplusplus 8 extern "C" { 9 #endif 10 11 #include "../../lv_conf_internal.h" 12 #include "tjpgdcnf.h" 13 14 #if LV_USE_TJPGD 15 16 #include <string.h> 17 #include <stdint.h> 18 19 #if JD_FASTDECODE >= 1 20 typedef int16_t jd_yuv_t; 21 #else 22 typedef uint8_t jd_yuv_t; 23 #endif 24 25 26 /* Error code */ 27 typedef enum { 28 JDR_OK = 0, /* 0: Succeeded */ 29 JDR_INTR, /* 1: Interrupted by output function */ 30 JDR_INP, /* 2: Device error or wrong termination of input stream */ 31 JDR_MEM1, /* 3: Insufficient memory pool for the image */ 32 JDR_MEM2, /* 4: Insufficient stream input buffer */ 33 JDR_PAR, /* 5: Parameter error */ 34 JDR_FMT1, /* 6: Data format error (may be broken data) */ 35 JDR_FMT2, /* 7: Right format but not supported */ 36 JDR_FMT3 /* 8: Not supported JPEG standard */ 37 } JRESULT; 38 39 40 41 /* Rectangular region in the output image */ 42 typedef struct { 43 uint16_t left; /* Left end */ 44 uint16_t right; /* Right end */ 45 uint16_t top; /* Top end */ 46 uint16_t bottom; /* Bottom end */ 47 } JRECT; 48 49 50 51 /* Decompressor object structure */ 52 typedef struct JDEC JDEC; 53 struct JDEC { 54 size_t dctr; /* Number of bytes available in the input buffer */ 55 uint8_t * dptr; /* Current data read ptr */ 56 uint8_t * inbuf; /* Bit stream input buffer */ 57 uint8_t dbit; /* Number of bits available in wreg or reading bit mask */ 58 uint8_t scale; /* Output scaling ratio */ 59 uint8_t msx, msy; /* MCU size in unit of block (width, height) */ 60 uint8_t qtid[3]; /* Quantization table ID of each component, Y, Cb, Cr */ 61 uint8_t ncomp; /* Number of color components 1:grayscale, 3:color */ 62 int16_t dcv[3]; /* Previous DC element of each component */ 63 uint16_t nrst; /* Restart interval */ 64 uint16_t rst; /* Restart count*/ 65 uint16_t rsc; /* Expected restart sequence ID*/ 66 uint16_t width, height; /* Size of the input image (pixel) */ 67 uint8_t * huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */ 68 uint16_t * huffcode[2][2]; /* Huffman code word tables [id][dcac] */ 69 uint8_t * huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */ 70 int32_t * qttbl[4]; /* Dequantizer tables [id] */ 71 #if JD_FASTDECODE >= 1 72 uint32_t wreg; /* Working shift register */ 73 uint8_t marker; /* Detected marker (0:None) */ 74 #if JD_FASTDECODE == 2 75 uint8_t longofs[2][2]; /* Table offset of long code [id][dcac] */ 76 uint16_t * hufflut_ac[2]; /* Fast huffman decode tables for AC short code [id] */ 77 uint8_t * hufflut_dc[2]; /* Fast huffman decode tables for DC short code [id] */ 78 #endif 79 #endif 80 void * workbuf; /* Working buffer for IDCT and RGB output */ 81 jd_yuv_t * mcubuf; /* Working buffer for the MCU */ 82 void * pool; /* Pointer to available memory pool */ 83 void * pool_original; /* Pointer to original pool */ 84 size_t sz_pool; /* Size of memory pool (bytes available) */ 85 size_t (*infunc)(JDEC *, uint8_t *, size_t); /* Pointer to jpeg stream input function */ 86 void * device; /* Pointer to I/O device identifier for the session */ 87 }; 88 89 90 91 /* TJpgDec API functions */ 92 JRESULT jd_prepare(JDEC * jd, size_t (*infunc)(JDEC *, uint8_t *, size_t), void * pool, size_t sz_pool, void * dev); 93 94 JRESULT jd_decomp(JDEC * jd, int (*outfunc)(JDEC *, void *, JRECT *), uint8_t scale); 95 96 JRESULT jd_mcu_load(JDEC * jd); 97 98 JRESULT jd_mcu_output(JDEC * jd, int (*outfunc)(JDEC *, void *, JRECT *), unsigned int x, unsigned int y); 99 100 JRESULT jd_restart(JDEC * jd, uint16_t rstn); 101 102 #endif 103 104 #ifdef __cplusplus 105 } 106 #endif 107 108 #endif /* _TJPGDEC */ 109
