From db7971734fc940851b6d91a77a60906622f6c491 Mon Sep 17 00:00:00 2001 From: inmarket Date: Sat, 26 Aug 2017 15:22:38 +1000 Subject: First attempt at the JPG decoder. Compiles but may not run. --- src/gdisp/gdisp_image_jpg.c | 1148 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 1147 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/gdisp/gdisp_image_jpg.c b/src/gdisp/gdisp_image_jpg.c index 9a10f215..9c149357 100644 --- a/src/gdisp/gdisp_image_jpg.c +++ b/src/gdisp/gdisp_image_jpg.c @@ -3,14 +3,1160 @@ * the license was not distributed with this file, you can obtain one at: * * http://ugfx.org/license.html + * + * Note: part of this file is based on TJpgDec - Tiny JPEG Decompressor R0.01b (C)ChaN, 2012 + * with modifications for uGFX. The copyright notice for that code is in this file + * when that code begins. */ #include "../../gfx.h" #if GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_JPG +#if GFX_COMPILER_WARNING_TYPE == GFX_COMPILER_WARNING_DIRECT + #warning "GDISP JPG DECODER: This decoder is completly untested. It also currently has the downside that it always caches the complete image into RAM" +#elif GFX_COMPILER_WARNING_TYPE == GFX_COMPILER_WARNING_MACRO + COMPILER_WARNING("GDISP JPG DECODER: This decoder is completly untested. It also currently has the downside that it always caches the complete image into RAM") +#endif + #include "gdisp_image_support.h" -#error "JPG support not implemented yet" +#define JD_SZBUF 512 /* Size of stream input buffer */ +#define JD_USE_SCALE 0 /* Use descaling feature for output */ +#define JD_TBLCLIP 0 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */ + +#define JD_WORKSZ (JD_SZBUF+2580+8) /* The extra 8 bytes just for safety */ + +typedef struct { + coord_t left, right, top, bottom; +} JRECT; +/* Decompressor object structure */ +typedef struct JDEC { + unsigned 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 */ + unsigned 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]; /* Dequaitizer 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 */ + unsigned sz_pool; /* Size of momory pool (bytes available) */ + gdispImage* img; /* Pointer to I/O device identifiler for the session */ + } JDEC; + +/* TJpgDec API functions */ +gdispImageError jd_prepare(JDEC*, void*, gdispImage*); +gdispImageError jd_decomp(JDEC*, unsigned(*)(gdispImage*,void*,JRECT*), uint8_t); + +/*---------------------------------------------------------------------------*/ +typedef struct gdispImagePrivate_JPG { + pixel_t *frame0cache; + } gdispImagePrivate_JPG; + +gdispImageError gdispImageOpen_JPG(gdispImage *img){ + gdispImagePrivate_JPG *priv; + uint8_t hdr[4]; + unsigned len; + + /* Read the file identifier */ + if (gfileRead(img->f, hdr, 2) != 2) + return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us + + /* Test the JPEG header structure */ + if (hdr[0] != 0xff || hdr[1] != 0xd8) + return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us + + /* We know we are a JPG format image */ + img->type = GDISP_IMAGE_TYPE_JPG; + img->flags = 0; + + /* Process Start of frame segments */ + while(1) { + + // Get a JPEG marker + if (gfileRead(img->f, hdr, 4) != 4 || hdr[0] != 0xFF) + return GDISP_IMAGE_ERR_BADDATA; + + switch (hdr[1]) { + case 0xC0: // SOF0 + gfileRead(img->f, hdr, 4); + img->height = gdispImageGetAlignedBE16(hdr, 0); + img->width = gdispImageGetAlignedBE16(hdr, 2); + + /* Allocate our private area */ + if (!(img->priv = gdispImageAlloc(img, sizeof(gdispImagePrivate_JPG)))) + return GDISP_IMAGE_ERR_NOMEMORY; + + /* Initialise the essential bits in the private area */ + priv = (gdispImagePrivate_JPG *)img->priv; + priv->frame0cache = 0; + + return GDISP_IMAGE_ERR_OK; + + case 0xD9: // EOI + return GDISP_IMAGE_ERR_UNSUPPORTED; /* Unsuppoted JPEG standard (may be progressive JPEG) */ + + default: + // Other SOFn markers are unsupported + if (hdr[1] >= 0xC1 && hdr[1] <= 0xCF) + return GDISP_IMAGE_ERR_UNSUPPORTED; + + // Skip segment data + len = gdispImageGetAlignedBE16(hdr, 2); + if (len <= 2) return GDISP_IMAGE_ERR_BADDATA; + gfileSetPos(img->f, gfileGetPos(img->f)+len-2); + } + } +} + +void gdispImageClose_JPG(gdispImage *img){ + gdispImagePrivate_JPG *priv = (gdispImagePrivate_JPG *)img->priv; + if(priv){ + if (priv->frame0cache){ + gdispImageFree(img, (void *)priv->frame0cache, img->width * img->height * sizeof(pixel_t)); + } + gdispImageFree(img, (void*) priv, sizeof(gdispImagePrivate_JPG)); + } +} + +static unsigned gdispImage_JPG_WriteToCache(gdispImage *img, void *bitmap, JRECT *rect) +{ + gdispImagePrivate_JPG *priv; + uint8_t *in; + pixel_t *out; + coord_t x, y; + + priv = (gdispImagePrivate_JPG *)img->priv; + in = (unsigned char *)bitmap; + + for (y = rect->top; y <= rect->bottom; y++) { + out = priv->frame0cache + ((img->width * (unsigned)y) + rect->left); + for(x = rect->left; x <= rect->right; x++, in += 3) + *out++ = RGB2COLOR(in[0], in[1], in[2]); + } + return 1; +} + +gdispImageError gdispImageCache_JPG(gdispImage *img) { + gdispImagePrivate_JPG *priv; + JDEC *jd; + gdispImageError r; + + /* If we are already cached - just return OK */ + priv = (gdispImagePrivate_JPG *)img->priv; + if (priv->frame0cache) + return GDISP_IMAGE_ERR_OK; + + /* Otherwise start a new decode */ + priv->frame0cache = (pixel_t *)gdispImageAlloc(img, img->width * img->height * sizeof(pixel_t)); + if (!priv->frame0cache) + return GDISP_IMAGE_ERR_NOMEMORY; + + if (!(jd = gdispImageAlloc(img, sizeof(JDEC)+JD_WORKSZ))) + return GDISP_IMAGE_ERR_NOMEMORY; + + gfileSetPos(img->f, 0); + + if(!(r = jd_prepare(jd, jd+1, img)) + && !(r = jd_decomp(jd, gdispImage_JPG_WriteToCache, 0))) + r = GDISP_IMAGE_ERR_OK; + + gdispImageFree(img, jd, sizeof(JDEC)+JD_WORKSZ); + + return r; +} + +gdispImageError gdispGImageDraw_JPG(GDisplay *g, gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy){ + gdispImagePrivate_JPG * priv; + + priv = (gdispImagePrivate_JPG *)img->priv; + + /* Check some reasonableness */ + if (sx >= img->width || sy >= img->height) return GDISP_IMAGE_ERR_OK; + if (sx + cx > img->width) cx = img->width - sx; + if (sy + cy > img->height) cy = img->height - sy; + + /* Cache the image if not already cached */ + if (!priv->frame0cache) { + gdispImageError err = gdispImageCache_JPG(img); + if(err){ + return err; + } + } + gdispGBlitArea(g, x, y, cx, cy, sx, sy, img->width, priv->frame0cache); + + return GDISP_IMAGE_ERR_OK; +} + +delaytime_t gdispImageNext_JPG(gdispImage *img) { + (void) img; + + /* No more frames/pages */ + return TIME_INFINITE; +} + +/*----------------------------------------------------------------------------/ +/ TJpgDec - Tiny JPEG Decompressor R0.01b (C)ChaN, 2012 +/-----------------------------------------------------------------------------/ +/ The TJpgDec is a generic JPEG decompressor module for tiny embedded systems. +/ This is a free software that opened for education, research and commercial +/ developments under license policy of following terms. +/ +/ Copyright (C) 2012, ChaN, all right reserved. +/ +/ * The TJpgDec module is a free software and there is NO WARRANTY. +/ * No restriction on use. You can use, modify and redistribute it for +/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY. +/ * Redistributions of source code must retain the above copyright notice. +/ +/-----------------------------------------------------------------------------/ +/ Oct 04,'11 R0.01 First release. +/ Feb 19,'12 R0.01a Fixed decompression fails when scan starts with an escape seq. +/ Sep 03,'12 R0.01b Added JD_TBLCLIP option. +/ Aug 26,'17 Modified and optimised for uGFX +/----------------------------------------------------------------------------*/ + +/*-----------------------------------------------*/ +/* Zigzag-order to raster-order conversion table */ +/*-----------------------------------------------*/ + +#define ZIG(n) Zig[n] + +static +const uint8_t Zig[64] = { /* Zigzag-order to raster-order conversion table */ + 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63 +}; + + + +/*-------------------------------------------------*/ +/* Input scale factor of Arai algorithm */ +/* (scaled up 16 bits for fixed point operations) */ +/*-------------------------------------------------*/ + +#define IPSF(n) Ipsf[n] + +static +const uint16_t Ipsf[64] = { /* See also aa_idct.png */ + (uint16_t)(1.00000*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.17588*8192), (uint16_t)(1.00000*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.27590*8192), + (uint16_t)(1.38704*8192), (uint16_t)(1.92388*8192), (uint16_t)(1.81226*8192), (uint16_t)(1.63099*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.08979*8192), (uint16_t)(0.75066*8192), (uint16_t)(0.38268*8192), + (uint16_t)(1.30656*8192), (uint16_t)(1.81226*8192), (uint16_t)(1.70711*8192), (uint16_t)(1.53636*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.02656*8192), (uint16_t)(0.70711*8192), (uint16_t)(0.36048*8192), + (uint16_t)(1.17588*8192), (uint16_t)(1.63099*8192), (uint16_t)(1.53636*8192), (uint16_t)(1.38268*8192), (uint16_t)(1.17588*8192), (uint16_t)(0.92388*8192), (uint16_t)(0.63638*8192), (uint16_t)(0.32442*8192), + (uint16_t)(1.00000*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.17588*8192), (uint16_t)(1.00000*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.27590*8192), + (uint16_t)(0.78570*8192), (uint16_t)(1.08979*8192), (uint16_t)(1.02656*8192), (uint16_t)(0.92388*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.61732*8192), (uint16_t)(0.42522*8192), (uint16_t)(0.21677*8192), + (uint16_t)(0.54120*8192), (uint16_t)(0.75066*8192), (uint16_t)(0.70711*8192), (uint16_t)(0.63638*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.42522*8192), (uint16_t)(0.29290*8192), (uint16_t)(0.14932*8192), + (uint16_t)(0.27590*8192), (uint16_t)(0.38268*8192), (uint16_t)(0.36048*8192), (uint16_t)(0.32442*8192), (uint16_t)(0.27590*8192), (uint16_t)(0.21678*8192), (uint16_t)(0.14932*8192), (uint16_t)(0.07612*8192) +}; + + + +/*---------------------------------------------*/ +/* Conversion table for fast clipping process */ +/*---------------------------------------------*/ + +#if JD_TBLCLIP + +#define BYTECLIP(v) Clip8[(unsigned)(v) & 0x3FF] + +static +const uint8_t Clip8[1024] = { + /* 0..255 */ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, + 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, + 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, + 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, + 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, + 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, + 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, + /* 256..511 */ + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, + /* -512..-257 */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + /* -256..-1 */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +#else /* JD_TBLCLIP */ + +inline +uint8_t BYTECLIP ( + int val +) +{ + if (val < 0) val = 0; + if (val > 255) val = 255; + + return (uint8_t)val; +} + +#endif + + + +/*-----------------------------------------------------------------------*/ +/* Allocate a memory block from memory pool */ +/*-----------------------------------------------------------------------*/ + +static +void* alloc_pool ( /* Pointer to allocated memory block (NULL:no memory available) */ + JDEC* jd, /* Pointer to the decompressor object */ + unsigned nd /* Number of bytes to allocate */ +) +{ + char *rp = 0; + + + nd = (nd + 3) & ~3; /* Align block size to the word boundary */ + + if (jd->sz_pool >= nd) { + jd->sz_pool -= nd; + rp = (char*)jd->pool; /* Get start of available memory pool */ + jd->pool = (void*)(rp + nd); /* Allocate requierd bytes */ + } + + return (void*)rp; /* Return allocated memory block (NULL:no memory to allocate) */ +} + + + + +/*-----------------------------------------------------------------------*/ +/* Create de-quantization and prescaling tables with a DQT segment */ +/*-----------------------------------------------------------------------*/ + +static +unsigned create_qt_tbl ( /* 0:OK, !0:Failed */ + JDEC* jd, /* Pointer to the decompressor object */ + const uint8_t* data, /* Pointer to the quantizer tables */ + unsigned ndata /* Size of input data */ +) +{ + unsigned i; + uint8_t d, z; + int32_t *pb; + + + while (ndata) { /* Process all tables in the segment */ + if (ndata < 65) return GDISP_IMAGE_ERR_BADDATA; /* Err: table size is unaligned */ + ndata -= 65; + d = *data++; /* Get table property */ + if (d & 0xF0) return GDISP_IMAGE_ERR_BADDATA; /* Err: not 8-bit resolution */ + i = d & 3; /* Get table ID */ + pb = alloc_pool(jd, 64 * sizeof (int32_t));/* Allocate a memory block for the table */ + if (!pb) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + jd->qttbl[i] = pb; /* Register the table */ + for (i = 0; i < 64; i++) { /* Load the table */ + z = ZIG(i); /* Zigzag-order to raster-order conversion */ + pb[z] = (int32_t)((uint32_t)*data++ * IPSF(z)); /* Apply scale factor of Arai algorithm to the de-quantizers */ + } + } + + return GDISP_IMAGE_ERR_OK; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Create huffman code tables with a DHT segment */ +/*-----------------------------------------------------------------------*/ + +static +unsigned create_huffman_tbl ( /* 0:OK, !0:Failed */ + JDEC* jd, /* Pointer to the decompressor object */ + const uint8_t* data, /* Pointer to the packed huffman tables */ + unsigned ndata /* Size of input data */ +) +{ + unsigned i, j, b, np, cls, num; + uint8_t d, *pb, *pd; + uint16_t hc, *ph; + + + while (ndata) { /* Process all tables in the segment */ + if (ndata < 17) return GDISP_IMAGE_ERR_BADDATA; /* Err: wrong data size */ + ndata -= 17; + d = *data++; /* Get table number and class */ + cls = (d >> 4); num = d & 0x0F; /* class = dc(0)/ac(1), table number = 0/1 */ + if (d & 0xEE) return GDISP_IMAGE_ERR_BADDATA; /* Err: invalid class/number */ + pb = alloc_pool(jd, 16); /* Allocate a memory block for the bit distribution table */ + if (!pb) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + jd->huffbits[num][cls] = pb; + for (np = i = 0; i < 16; i++) { /* Load number of patterns for 1 to 16-bit code */ + pb[i] = b = *data++; + np += b; /* Get sum of code words for each code */ + } + + ph = alloc_pool(jd, np * sizeof (uint16_t));/* Allocate a memory block for the code word table */ + if (!ph) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + jd->huffcode[num][cls] = ph; + hc = 0; + for (j = i = 0; i < 16; i++) { /* Re-build huffman code word table */ + b = pb[i]; + while (b--) ph[j++] = hc++; + hc <<= 1; + } + + if (ndata < np) return GDISP_IMAGE_ERR_BADDATA; /* Err: wrong data size */ + ndata -= np; + pd = alloc_pool(jd, np); /* Allocate a memory block for the decoded data */ + if (!pd) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + jd->huffdata[num][cls] = pd; + for (i = 0; i < np; i++) { /* Load decoded data corresponds to each code ward */ + d = *data++; + if (!cls && d > 11) return GDISP_IMAGE_ERR_BADDATA; + *pd++ = d; + } + } + + return GDISP_IMAGE_ERR_OK; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Extract N bits from input stream */ +/*-----------------------------------------------------------------------*/ + +static +int bitext ( /* >=0: extracted data, <0: error code */ + JDEC* jd, /* Pointer to the decompressor object */ + unsigned nbit /* Number of bits to extract (1 to 11) */ +) +{ + uint8_t msk, s, *dp; + unsigned dc, v, f; + + + msk = jd->dmsk; dc = jd->dctr; dp = jd->dptr; /* Bit mask, number of data available, read ptr */ + s = *dp; v = f = 0; + do { + if (!msk) { /* Next byte? */ + if (!dc) { /* No input data is available, re-fill input buffer */ + dp = jd->inbuf; /* Top of input buffer */ + dc = gfileRead(jd->img->f, dp, JD_SZBUF); + if (!dc) return 0 - (int)GDISP_IMAGE_ERR_BADDATA; /* Err: read error or wrong stream termination */ + } else { + dp++; /* Next data ptr */ + } + dc--; /* Decrement number of available bytes */ + if (f) { /* In flag sequence? */ + f = 0; /* Exit flag sequence */ + if (*dp != 0) return 0 - (int)GDISP_IMAGE_ERR_BADDATA; /* Err: unexpected flag is detected (may be collapted data) */ + *dp = s = 0xFF; /* The flag is a data 0xFF */ + } else { + s = *dp; /* Get next data byte */ + if (s == 0xFF) { /* Is start of flag sequence? */ + f = 1; continue; /* Enter flag sequence */ + } + } + msk = 0x80; /* Read from MSB */ + } + v <<= 1; /* Get a bit */ + if (s & msk) v++; + msk >>= 1; + nbit--; + } while (nbit); + jd->dmsk = msk; jd->dctr = dc; jd->dptr = dp; + + return (int)v; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Extract a huffman decoded data from input stream */ +/*-----------------------------------------------------------------------*/ + +static +int huffext ( /* >=0: decoded data, <0: error code */ + JDEC* jd, /* Pointer to the decompressor object */ + const uint8_t* hbits, /* Pointer to the bit distribution table */ + const uint16_t* hcode, /* Pointer to the code word table */ + const uint8_t* hdata /* Pointer to the data table */ +) +{ + uint8_t msk, s, *dp; + unsigned dc, v, f, bl, nd; + + + msk = jd->dmsk; dc = jd->dctr; dp = jd->dptr; /* Bit mask, number of data available, read ptr */ + s = *dp; v = f = 0; + bl = 16; /* Max code length */ + do { + if (!msk) { /* Next byte? */ + if (!dc) { /* No input data is available, re-fill input buffer */ + dp = jd->inbuf; /* Top of input buffer */ + dc = gfileRead(jd->img->f, dp, JD_SZBUF); + if (!dc) return 0 - (int)GDISP_IMAGE_ERR_BADDATA; /* Err: read error or wrong stream termination */ + } else { + dp++; /* Next data ptr */ + } + dc--; /* Decrement number of available bytes */ + if (f) { /* In flag sequence? */ + f = 0; /* Exit flag sequence */ + if (*dp != 0) + return 0 - (int)GDISP_IMAGE_ERR_BADDATA; /* Err: unexpected flag is detected (may be collapted data) */ + *dp = s = 0xFF; /* The flag is a data 0xFF */ + } else { + s = *dp; /* Get next data byte */ + if (s == 0xFF) { /* Is start of flag sequence? */ + f = 1; continue; /* Enter flag sequence, get trailing byte */ + } + } + msk = 0x80; /* Read from MSB */ + } + v <<= 1; /* Get a bit */ + if (s & msk) v++; + msk >>= 1; + + for (nd = *hbits++; nd; nd--) { /* Search the code word in this bit length */ + if (v == *hcode++) { /* Matched? */ + jd->dmsk = msk; jd->dctr = dc; jd->dptr = dp; + return *hdata; /* Return the decoded data */ + } + hdata++; + } + bl--; + } while (bl); + + return 0 - (int)GDISP_IMAGE_ERR_BADDATA; /* Err: code not found (may be collapted data) */ +} + + + + +/*-----------------------------------------------------------------------*/ +/* Apply Inverse-DCT in Arai Algorithm (see also aa_idct.png) */ +/*-----------------------------------------------------------------------*/ + +static +void block_idct ( + int32_t* src, /* Input block data (de-quantized and pre-scaled for Arai Algorithm) */ + uint8_t* dst /* Pointer to the destination to store the block as byte array */ +) +{ + const int32_t M13 = (int32_t)(1.41421*4096), M2 = (int32_t)(1.08239*4096), M4 = (int32_t)(2.61313*4096), M5 = (int32_t)(1.84776*4096); + int32_t v0, v1, v2, v3, v4, v5, v6, v7; + int32_t t10, t11, t12, t13; + unsigned i; + + /* Process columns */ + for (i = 0; i < 8; i++) { + v0 = src[8 * 0]; /* Get even elements */ + v1 = src[8 * 2]; + v2 = src[8 * 4]; + v3 = src[8 * 6]; + + t10 = v0 + v2; /* Process the even elements */ + t12 = v0 - v2; + t11 = (v1 - v3) * M13 >> 12; + v3 += v1; + t11 -= v3; + v0 = t10 + v3; + v3 = t10 - v3; + v1 = t11 + t12; + v2 = t12 - t11; + + v4 = src[8 * 7]; /* Get odd elements */ + v5 = src[8 * 1]; + v6 = src[8 * 5]; + v7 = src[8 * 3]; + + t10 = v5 - v4; /* Process the odd elements */ + t11 = v5 + v4; + t12 = v6 - v7; + v7 += v6; + v5 = (t11 - v7) * M13 >> 12; + v7 += t11; + t13 = (t10 + t12) * M5 >> 12; + v4 = t13 - (t10 * M2 >> 12); + v6 = t13 - (t12 * M4 >> 12) - v7; + v5 -= v6; + v4 -= v5; + + src[8 * 0] = v0 + v7; /* Write-back transformed values */ + src[8 * 7] = v0 - v7; + src[8 * 1] = v1 + v6; + src[8 * 6] = v1 - v6; + src[8 * 2] = v2 + v5; + src[8 * 5] = v2 - v5; + src[8 * 3] = v3 + v4; + src[8 * 4] = v3 - v4; + + src++; /* Next column */ + } + + /* Process rows */ + src -= 8; + for (i = 0; i < 8; i++) { + v0 = src[0] + (128L << 8); /* Get even elements (remove DC offset (-128) here) */ + v1 = src[2]; + v2 = src[4]; + v3 = src[6]; + + t10 = v0 + v2; /* Process the even elements */ + t12 = v0 - v2; + t11 = (v1 - v3) * M13 >> 12; + v3 += v1; + t11 -= v3; + v0 = t10 + v3; + v3 = t10 - v3; + v1 = t11 + t12; + v2 = t12 - t11; + + v4 = src[7]; /* Get odd elements */ + v5 = src[1]; + v6 = src[5]; + v7 = src[3]; + + t10 = v5 - v4; /* Process the odd elements */ + t11 = v5 + v4; + t12 = v6 - v7; + v7 += v6; + v5 = (t11 - v7) * M13 >> 12; + v7 += t11; + t13 = (t10 + t12) * M5 >> 12; + v4 = t13 - (t10 * M2 >> 12); + v6 = t13 - (t12 * M4 >> 12) - v7; + v5 -= v6; + v4 -= v5; + + dst[0] = BYTECLIP((v0 + v7) >> 8); /* Descale the transformed values 8 bits and output */ + dst[7] = BYTECLIP((v0 - v7) >> 8); + dst[1] = BYTECLIP((v1 + v6) >> 8); + dst[6] = BYTECLIP((v1 - v6) >> 8); + dst[2] = BYTECLIP((v2 + v5) >> 8); + dst[5] = BYTECLIP((v2 - v5) >> 8); + dst[3] = BYTECLIP((v3 + v4) >> 8); + dst[4] = BYTECLIP((v3 - v4) >> 8); + dst += 8; + + src += 8; /* Next row */ + } +} + + + + +/*-----------------------------------------------------------------------*/ +/* Load all blocks in the MCU into working buffer */ +/*-----------------------------------------------------------------------*/ + +static +gdispImageError mcu_load ( + JDEC* jd /* Pointer to the decompressor object */ +) +{ + int32_t *tmp = (int32_t*)jd->workbuf; /* Block working buffer for de-quantize and IDCT */ + unsigned blk, nby, nbc, i, z, id, cmp; + int b, d, e; + uint8_t *bp; + const uint8_t *hb, *hd; + const uint16_t *hc; + const int32_t *dqf; + + + nby = jd->msx * jd->msy; /* Number of Y blocks (1, 2 or 4) */ + nbc = 2; /* Number of C blocks (2) */ + bp = jd->mcubuf; /* Pointer to the first block */ + + for (blk = 0; blk < nby + nbc; blk++) { + cmp = (blk < nby) ? 0 : blk - nby + 1; /* Component number 0:Y, 1:Cb, 2:Cr */ + id = cmp ? 1 : 0; /* Huffman table ID of the component */ + + /* Extract a DC element from input stream */ + hb = jd->huffbits[id][0]; /* Huffman table for the DC element */ + hc = jd->huffcode[id][0]; + hd = jd->huffdata[id][0]; + b = huffext(jd, hb, hc, hd); /* Extract a huffman coded data (bit length) */ + if (b < 0) return 0 - b; /* Err: invalid code or input */ + d = jd->dcv[cmp]; /* DC value of previous block */ + if (b) { /* If there is any difference from previous block */ + e = bitext(jd, b); /* Extract data bits */ + if (e < 0) return 0 - e; /* Err: input */ + b = 1 << (b - 1); /* MSB position */ + if (!(e & b)) e -= (b << 1) - 1; /* Restore sign if needed */ + d += e; /* Get current value */ + jd->dcv[cmp] = (int16_t)d; /* Save current DC value for next block */ + } + dqf = jd->qttbl[jd->qtid[cmp]]; /* De-quantizer table ID for this component */ + tmp[0] = d * dqf[0] >> 8; /* De-quantize, apply scale factor of Arai algorithm and descale 8 bits */ + + /* Extract following 63 AC elements from input stream */ + for (i = 1; i < 64; i++) tmp[i] = 0; /* Clear rest of elements */ + hb = jd->huffbits[id][1]; /* Huffman table for the AC elements */ + hc = jd->huffcode[id][1]; + hd = jd->huffdata[id][1]; + i = 1; /* Top of the AC elements */ + do { + b = huffext(jd, hb, hc, hd); /* Extract a huffman coded value (zero runs and bit length) */ + if (b == 0) break; /* EOB? */ + if (b < 0) return 0 - b; /* Err: invalid code or input error */ + z = (unsigned)b >> 4; /* Number of leading zero elements */ + if (z) { + i += z; /* Skip zero elements */ + if (i >= 64) return GDISP_IMAGE_ERR_BADDATA; /* Too long zero run */ + } + if (b &= 0x0F) { /* Bit length */ + d = bitext(jd, b); /* Extract data bits */ + if (d < 0) return 0 - d; /* Err: input device */ + b = 1 << (b - 1); /* MSB position */ + if (!(d & b)) d -= (b << 1) - 1;/* Restore negative value if needed */ + z = ZIG(i); /* Zigzag-order to raster-order converted index */ + tmp[z] = d * dqf[z] >> 8; /* De-quantize, apply scale factor of Arai algorithm and descale 8 bits */ + } + } while (++i < 64); /* Next AC element */ + + if (JD_USE_SCALE && jd->scale == 3) + *bp = (*tmp / 256) + 128; /* If scale ratio is 1/8, IDCT can be ommited and only DC element is used */ + else + block_idct(tmp, bp); /* Apply IDCT and store the block to the MCU buffer */ + + bp += 64; /* Next block */ + } + + return GDISP_IMAGE_ERR_OK; /* All blocks have been loaded successfully */ +} + + + + +/*-----------------------------------------------------------------------*/ +/* Output an MCU: Convert YCrCb to RGB and output it in RGB form */ +/*-----------------------------------------------------------------------*/ + +static +gdispImageError mcu_output ( + JDEC* jd, /* Pointer to the decompressor object */ + unsigned (*outfunc)(gdispImage*, void*, JRECT*), /* RGB output function */ + unsigned x, /* MCU position in the image (left of the MCU) */ + unsigned y /* MCU position in the image (top of the MCU) */ +) +{ + const int CVACC = (sizeof (int) > 2) ? 1024 : 128; + unsigned ix, iy, mx, my, rx, ry; + int yy, cb, cr; + uint8_t *py, *pc, *rgb24; + JRECT rect; + + + mx = jd->msx * 8; my = jd->msy * 8; /* MCU size (pixel) */ + rx = (x + mx <= jd->width) ? mx : jd->width - x; /* Output rectangular size (it may be clipped at right/bottom end) */ + ry = (y + my <= jd->height) ? my : jd->height - y; + if (JD_USE_SCALE) { + rx >>= jd->scale; ry >>= jd->scale; + if (!rx || !ry) return GDISP_IMAGE_ERR_OK; /* Skip this MCU if all pixel is to be rounded off */ + x >>= jd->scale; y >>= jd->scale; + } + rect.left = x; rect.right = x + rx - 1; /* Rectangular area in the frame buffer */ + rect.top = y; rect.bottom = y + ry - 1; + + + if (!JD_USE_SCALE || jd->scale != 3) { /* Not for 1/8 scaling */ + + /* Build an RGB MCU from discrete comopnents */ + rgb24 = (uint8_t*)jd->workbuf; + for (iy = 0; iy < my; iy++) { + pc = jd->mcubuf; + py = pc + iy * 8; + if (my == 16) { /* Double block height? */ + pc += 64 * 4 + (iy >> 1) * 8; + if (iy >= 8) py += 64; + } else { /* Single block height */ + pc += mx * 8 + iy * 8; + } + for (ix = 0; ix < mx; ix++) { + cb = pc[0] - 128; /* Get Cb/Cr component and restore right level */ + cr = pc[64] - 128; + if (mx == 16) { /* Double block width? */ + if (ix == 8) py += 64 - 8; /* Jump to next block if double block heigt */ + pc += ix & 1; /* Increase chroma pointer every two pixels */ + } else { /* Single block width */ + pc++; /* Increase chroma pointer every pixel */ + } + yy = *py++; /* Get Y component */ + + /* Convert YCbCr to RGB */ + *rgb24++ = /* R */ BYTECLIP(yy + ((int)(1.402 * CVACC) * cr) / CVACC); + *rgb24++ = /* G */ BYTECLIP(yy - ((int)(0.344 * CVACC) * cb + (int)(0.714 * CVACC) * cr) / CVACC); + *rgb24++ = /* B */ BYTECLIP(yy + ((int)(1.772 * CVACC) * cb) / CVACC); + } + } + + /* Descale the MCU rectangular if needed */ + if (JD_USE_SCALE && jd->scale) { + unsigned x, y, r, g, b, s, w, a; + uint8_t *op; + + /* Get averaged RGB value of each square correcponds to a pixel */ + s = jd->scale * 2; /* Bumber of shifts for averaging */ + w = 1 << jd->scale; /* Width of square */ + a = (mx - w) * 3; /* Bytes to skip for next line in the square */ + op = (uint8_t*)jd->workbuf; + for (iy = 0; iy < my; iy += w) { + for (ix = 0; ix < mx; ix += w) { + rgb24 = (uint8_t*)jd->workbuf + (iy * mx + ix) * 3; + r = g = b = 0; + for (y = 0; y < w; y++) { /* Accumulate RGB value in the square */ + for (x = 0; x < w; x++) { + r += *rgb24++; + g += *rgb24++; + b += *rgb24++; + } + rgb24 += a; + } /* Put the averaged RGB value as a pixel */ + *op++ = (uint8_t)(r >> s); + *op++ = (uint8_t)(g >> s); + *op++ = (uint8_t)(b >> s); + } + } + } + + } else { /* For only 1/8 scaling (left-top pixel in each block are the DC value of the block) */ + + /* Build a 1/8 descaled RGB MCU from discrete comopnents */ + rgb24 = (uint8_t*)jd->workbuf; + pc = jd->mcubuf + mx * my; + cb = pc[0] - 128; /* Get Cb/Cr component and restore right level */ + cr = pc[64] - 128; + for (iy = 0; iy < my; iy += 8) { + py = jd->mcubuf; + if (iy == 8) py += 64 * 2; + for (ix = 0; ix < mx; ix += 8) { + yy = *py; /* Get Y component */ + py += 64; + + /* Convert YCbCr to RGB */ + *rgb24++ = /* R */ BYTECLIP(yy + ((int)(1.402 * CVACC) * cr / CVACC)); + *rgb24++ = /* G */ BYTECLIP(yy - ((int)(0.344 * CVACC) * cb + (int)(0.714 * CVACC) * cr) / CVACC); + *rgb24++ = /* B */ BYTECLIP(yy + ((int)(1.772 * CVACC) * cb / CVACC)); + } + } + } + + /* Squeeze up pixel table if a part of MCU is to be truncated */ + mx >>= jd->scale; + if (rx < mx) { + uint8_t *s, *d; + unsigned x, y; + + s = d = (uint8_t*)jd->workbuf; + for (y = 0; y < ry; y++) { + for (x = 0; x < rx; x++) { /* Copy effective pixels */ + *d++ = *s++; + *d++ = *s++; + *d++ = *s++; + } + s += (mx - rx) * 3; /* Skip truncated pixels */ + } + } + +#if 0 + /* Convert RGB888 to RGB565 if needed */ + if (JD_FORMAT == 1) { + uint8_t *s = (uint8_t*)jd->workbuf; + uint16_t w, *d = (uint16_t*)s; + unsigned n = rx * ry; + + do { + w = (*s++ & 0xF8) << 8; /* RRRRR----------- */ + w |= (*s++ & 0xFC) << 3; /* -----GGGGGG----- */ + w |= *s++ >> 3; /* -----------BBBBB */ + *d++ = w; + } while (--n); + } +#endif + + /* Output the RGB rectangular */ + return outfunc(jd->img, jd->workbuf, &rect) ? GDISP_IMAGE_ERR_OK : GDISP_IMAGE_ERR_BADDATA; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Process restart interval */ +/*-----------------------------------------------------------------------*/ + +static +gdispImageError restart ( + JDEC* jd, /* Pointer to the decompressor object */ + uint16_t rstn /* Expected restert sequense number */ +) +{ + unsigned i, dc; + uint16_t d; + uint8_t *dp; + + + /* Discard padding bits and get two bytes from the input stream */ + dp = jd->dptr; dc = jd->dctr; + d = 0; + for (i = 0; i < 2; i++) { + if (!dc) { /* No input data is available, re-fill input buffer */ + dp = jd->inbuf; + dc = gfileRead(jd->img->f, dp, JD_SZBUF); + if (!dc) return GDISP_IMAGE_ERR_BADDATA; + } else { + dp++; + } + dc--; + d = (d << 8) | *dp; /* Get a byte */ + } + jd->dptr = dp; jd->dctr = dc; jd->dmsk = 0; + + /* Check the marker */ + if ((d & 0xFFD8) != 0xFFD0 || (d & 7) != (rstn & 7)) + return GDISP_IMAGE_ERR_BADDATA; /* Err: expected RSTn marker is not detected (may be collapted data) */ + + /* Reset DC offset */ + jd->dcv[2] = jd->dcv[1] = jd->dcv[0] = 0; + + return GDISP_IMAGE_ERR_OK; +} + + + + +/*-----------------------------------------------------------------------*/ +/* Analyze the JPEG image and Initialize decompressor object */ +/*-----------------------------------------------------------------------*/ + +gdispImageError jd_prepare ( + JDEC* jd, /* Blank decompressor object */ + void* pool, /* Working buffer for the decompression session */ + gdispImage* img /* I/O device identifier for the session */ +) +{ + uint8_t *seg, b; + uint16_t marker; + uint32_t ofs; + unsigned n, i, j, len; + gdispImageError rc; + + + jd->pool = pool; /* Work memroy */ + jd->sz_pool = JD_WORKSZ; /* Size of given work memory */ + jd->img = img; /* I/O device identifier */ + jd->nrst = 0; /* No restart interval (default) */ + + for (i = 0; i < 2; i++) { /* Nulls pointers */ + for (j = 0; j < 2; j++) { + jd->huffbits[i][j] = 0; + jd->huffcode[i][j] = 0; + jd->huffdata[i][j] = 0; + } + } + for (i = 0; i < 4; i++) jd->qttbl[i] = 0; + + jd->inbuf = seg = alloc_pool(jd, JD_SZBUF); /* Allocate stream input buffer */ + if (!seg) return GDISP_IMAGE_ERR_NOMEMORY; + + if (gfileRead(jd->img->f, seg, 2) != 2) return GDISP_IMAGE_ERR_BADDATA;/* Check SOI marker */ + if (gdispImageGetAlignedBE16(seg, 0) != 0xFFD8) return GDISP_IMAGE_ERR_BADDATA; /* Err: SOI is not detected */ + ofs = 2; + + for (;;) { + /* Get a JPEG marker */ + if (gfileRead(jd->img->f, seg, 4) != 4) return GDISP_IMAGE_ERR_BADDATA; + marker = gdispImageGetAlignedBE16(seg, 0); /* Marker */ + len = gdispImageGetAlignedBE16(seg, 2); /* Length field */ + if (len <= 2 || (marker >> 8) != 0xFF) return GDISP_IMAGE_ERR_BADDATA; + len -= 2; /* Content size excluding length field */ + ofs += 4 + len; /* Number of bytes loaded */ + + switch (marker & 0xFF) { + case 0xC0: /* SOF0 (baseline JPEG) */ + /* Load segment data */ + if (len > JD_SZBUF) return GDISP_IMAGE_ERR_NOMEMORY; + if (gfileRead(jd->img->f, seg, len) != len) return GDISP_IMAGE_ERR_BADDATA; + + jd->width = gdispImageGetBE16(seg,3); /* Image width in unit of pixel */ + jd->height = gdispImageGetBE16(seg,1); /* Image height in unit of pixel */ + if (seg[5] != 3) return GDISP_IMAGE_ERR_BADDATA; /* Err: Supports only Y/Cb/Cr format */ + + /* Check three image components */ + for (i = 0; i < 3; i++) { + b = seg[7 + 3 * i]; /* Get sampling factor */ + if (!i) { /* Y component */ + if (b != 0x11 && b != 0x22 && b != 0x21)/* Check sampling factor */ + return GDISP_IMAGE_ERR_BADDATA; /* Err: Supports only 4:4:4, 4:2:0 or 4:2:2 */ + jd->msx = b >> 4; jd->msy = b & 15; /* Size of MCU [blocks] */ + } else { /* Cb/Cr component */ + if (b != 0x11) return GDISP_IMAGE_ERR_BADDATA; /* Err: Sampling factor of Cr/Cb must be 1 */ + } + b = seg[8 + 3 * i]; /* Get dequantizer table ID for this component */ + if (b > 3) return GDISP_IMAGE_ERR_BADDATA; /* Err: Invalid ID */ + jd->qtid[i] = b; + } + break; + + case 0xDD: /* DRI */ + /* Load segment data */ + if (len > JD_SZBUF) return GDISP_IMAGE_ERR_NOMEMORY; + if (gfileRead(jd->img->f, seg, len) != len) return GDISP_IMAGE_ERR_BADDATA; + + /* Get restart interval (MCUs) */ + jd->nrst = gdispImageGetAlignedBE16(seg, 0); + break; + + case 0xC4: /* DHT */ + /* Load segment data */ + if (len > JD_SZBUF) return GDISP_IMAGE_ERR_NOMEMORY; + if (gfileRead(jd->img->f, seg, len) != len) return GDISP_IMAGE_ERR_BADDATA; + + /* Create huffman tables */ + rc = create_huffman_tbl(jd, seg, len); + if (rc) return rc; + break; + + case 0xDB: /* DQT */ + /* Load segment data */ + if (len > JD_SZBUF) return GDISP_IMAGE_ERR_NOMEMORY; + if (gfileRead(jd->img->f, seg, len) != len) return GDISP_IMAGE_ERR_BADDATA; + + /* Create de-quantizer tables */ + rc = create_qt_tbl(jd, seg, len); + if (rc) return rc; + break; + + case 0xDA: /* SOS */ + /* Load segment data */ + if (len > JD_SZBUF) return GDISP_IMAGE_ERR_NOMEMORY; + if (gfileRead(jd->img->f, seg, len) != len) return GDISP_IMAGE_ERR_BADDATA; + + if (!jd->width || !jd->height) return GDISP_IMAGE_ERR_BADDATA; /* Err: Invalid image size */ + + if (seg[0] != 3) return GDISP_IMAGE_ERR_BADDATA; /* Err: Supports only three color components format */ + + /* Check if all tables corresponding to each components have been loaded */ + for (i = 0; i < 3; i++) { + b = seg[2 + 2 * i]; /* Get huffman table ID */ + if (b != 0x00 && b != 0x11) return GDISP_IMAGE_ERR_BADDATA; /* Err: Different table number for DC/AC element */ + b = i ? 1 : 0; + if (!jd->huffbits[b][0] || !jd->huffbits[b][1]) /* Check huffman table for this component */ + return GDISP_IMAGE_ERR_BADDATA; /* Err: Huffman table not loaded */ + if (!jd->qttbl[jd->qtid[i]]) return GDISP_IMAGE_ERR_BADDATA; /* Err: Dequantizer table not loaded */ + } + + /* Allocate working buffer for MCU and RGB */ + n = jd->msy * jd->msx; /* Number of Y blocks in the MCU */ + if (!n) return GDISP_IMAGE_ERR_BADDATA; /* Err: SOF0 has not been loaded */ + len = n * 64 * 2 + 64; /* Allocate buffer for IDCT and RGB output */ + if (len < 256) len = 256; /* but at least 256 byte is required for IDCT */ + jd->workbuf = alloc_pool(jd, len); /* and it may occupy a part of following MCU working buffer for RGB output */ + if (!jd->workbuf) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + jd->mcubuf = alloc_pool(jd, (n + 2) * 64); /* Allocate MCU working buffer */ + if (!jd->mcubuf) return GDISP_IMAGE_ERR_NOMEMORY; /* Err: not enough memory */ + + /* Pre-load the JPEG data to extract it from the bit stream */ + jd->dptr = seg; jd->dctr = 0; jd->dmsk = 0; /* Prepare to read bit stream */ + if (ofs %= JD_SZBUF) { /* Align read offset to JD_SZBUF */ + jd->dctr = gfileRead(jd->img->f, seg + ofs, JD_SZBUF - (unsigned)ofs); + jd->dptr = seg + ofs - 1; + } + + return GDISP_IMAGE_ERR_OK; /* Initialization succeeded. Ready to decompress the JPEG image. */ + + case 0xC1: /* SOF1 */ + case 0xC2: /* SOF2 */ + case 0xC3: /* SOF3 */ + case 0xC5: /* SOF5 */ + case 0xC6: /* SOF6 */ + case 0xC7: /* SOF7 */ + case 0xC9: /* SOF9 */ + case 0xCA: /* SOF10 */ + case 0xCB: /* SOF11 */ + case 0xCD: /* SOF13 */ + case 0xCE: /* SOF14 */ + case 0xCF: /* SOF15 */ + case 0xD9: /* EOI */ + return GDISP_IMAGE_ERR_UNSUPPORTED; /* Unsuppoted JPEG standard (may be progressive JPEG) */ + + default: /* Unknown segment (comment, exif or etc..) */ + /* Skip segment data */ + gfileSetPos(jd->img->f, gfileGetPos(jd->img->f)+len); + } + } +} + +/*-----------------------------------------------------------------------*/ +/* Start to decompress the JPEG picture */ +/*-----------------------------------------------------------------------*/ + +gdispImageError jd_decomp ( + JDEC* jd, /* Initialized decompression object */ + unsigned (*outfunc)(gdispImage*, void*, JRECT*), /* RGB output function */ + uint8_t scale /* Output de-scaling factor (0 to 3) */ +) +{ + unsigned x, y, mx, my; + uint16_t rst, rsc; + gdispImageError rc; + + + if (scale > (JD_USE_SCALE ? 3 : 0)) return GDISP_IMAGE_ERR_UNSUPPORTED; + jd->scale = scale; + + mx = jd->msx * 8; my = jd->msy * 8; /* Size of the MCU (pixel) */ + + jd->dcv[2] = jd->dcv[1] = jd->dcv[0] = 0; /* Initialize DC values */ + rst = rsc = 0; + + rc = GDISP_IMAGE_ERR_OK; + for (y = 0; y < jd->height; y += my) { /* Vertical loop of MCUs */ + for (x = 0; x < jd->width; x += mx) { /* Horizontal loop of MCUs */ + if (jd->nrst && rst++ == jd->nrst) { /* Process restart interval if enabled */ + rc = restart(jd, rsc++); + if (rc != GDISP_IMAGE_ERR_OK) return rc; + rst = 1; + } + rc = mcu_load(jd); /* Load an MCU (decompress huffman coded stream and apply IDCT) */ + if (rc != GDISP_IMAGE_ERR_OK) return rc; + rc = mcu_output(jd, outfunc, x, y); /* Output the MCU (color space conversion, scaling and output) */ + if (rc != GDISP_IMAGE_ERR_OK) return rc; + } + } + + return rc; +} + #endif /* GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_JPG */ -- cgit v1.2.3