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