LCOV - code coverage report
Current view: directory - media/libjpeg - jcmarker.c (source / functions) Found Hit Coverage
Test: app.info Lines: 221 146 66.1 %
Date: 2012-06-02 Functions: 19 13 68.4 %

       1                 : /*
       2                 :  * jcmarker.c
       3                 :  *
       4                 :  * Copyright (C) 1991-1998, Thomas G. Lane.
       5                 :  * Copyright (C) 2010, D. R. Commander.
       6                 :  * This file is part of the Independent JPEG Group's software.
       7                 :  * For conditions of distribution and use, see the accompanying README file.
       8                 :  *
       9                 :  * This file contains routines to write JPEG datastream markers.
      10                 :  */
      11                 : 
      12                 : #define JPEG_INTERNALS
      13                 : #include "jinclude.h"
      14                 : #include "jpeglib.h"
      15                 : #include "jpegcomp.h"
      16                 : 
      17                 : 
      18                 : typedef enum {                  /* JPEG marker codes */
      19                 :   M_SOF0  = 0xc0,
      20                 :   M_SOF1  = 0xc1,
      21                 :   M_SOF2  = 0xc2,
      22                 :   M_SOF3  = 0xc3,
      23                 :   
      24                 :   M_SOF5  = 0xc5,
      25                 :   M_SOF6  = 0xc6,
      26                 :   M_SOF7  = 0xc7,
      27                 :   
      28                 :   M_JPG   = 0xc8,
      29                 :   M_SOF9  = 0xc9,
      30                 :   M_SOF10 = 0xca,
      31                 :   M_SOF11 = 0xcb,
      32                 :   
      33                 :   M_SOF13 = 0xcd,
      34                 :   M_SOF14 = 0xce,
      35                 :   M_SOF15 = 0xcf,
      36                 :   
      37                 :   M_DHT   = 0xc4,
      38                 :   
      39                 :   M_DAC   = 0xcc,
      40                 :   
      41                 :   M_RST0  = 0xd0,
      42                 :   M_RST1  = 0xd1,
      43                 :   M_RST2  = 0xd2,
      44                 :   M_RST3  = 0xd3,
      45                 :   M_RST4  = 0xd4,
      46                 :   M_RST5  = 0xd5,
      47                 :   M_RST6  = 0xd6,
      48                 :   M_RST7  = 0xd7,
      49                 :   
      50                 :   M_SOI   = 0xd8,
      51                 :   M_EOI   = 0xd9,
      52                 :   M_SOS   = 0xda,
      53                 :   M_DQT   = 0xdb,
      54                 :   M_DNL   = 0xdc,
      55                 :   M_DRI   = 0xdd,
      56                 :   M_DHP   = 0xde,
      57                 :   M_EXP   = 0xdf,
      58                 :   
      59                 :   M_APP0  = 0xe0,
      60                 :   M_APP1  = 0xe1,
      61                 :   M_APP2  = 0xe2,
      62                 :   M_APP3  = 0xe3,
      63                 :   M_APP4  = 0xe4,
      64                 :   M_APP5  = 0xe5,
      65                 :   M_APP6  = 0xe6,
      66                 :   M_APP7  = 0xe7,
      67                 :   M_APP8  = 0xe8,
      68                 :   M_APP9  = 0xe9,
      69                 :   M_APP10 = 0xea,
      70                 :   M_APP11 = 0xeb,
      71                 :   M_APP12 = 0xec,
      72                 :   M_APP13 = 0xed,
      73                 :   M_APP14 = 0xee,
      74                 :   M_APP15 = 0xef,
      75                 :   
      76                 :   M_JPG0  = 0xf0,
      77                 :   M_JPG13 = 0xfd,
      78                 :   M_COM   = 0xfe,
      79                 :   
      80                 :   M_TEM   = 0x01,
      81                 :   
      82                 :   M_ERROR = 0x100
      83                 : } JPEG_MARKER;
      84                 : 
      85                 : 
      86                 : /* Private state */
      87                 : 
      88                 : typedef struct {
      89                 :   struct jpeg_marker_writer pub; /* public fields */
      90                 : 
      91                 :   unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
      92                 : } my_marker_writer;
      93                 : 
      94                 : typedef my_marker_writer * my_marker_ptr;
      95                 : 
      96                 : 
      97                 : /*
      98                 :  * Basic output routines.
      99                 :  *
     100                 :  * Note that we do not support suspension while writing a marker.
     101                 :  * Therefore, an application using suspension must ensure that there is
     102                 :  * enough buffer space for the initial markers (typ. 600-700 bytes) before
     103                 :  * calling jpeg_start_compress, and enough space to write the trailing EOI
     104                 :  * (a few bytes) before calling jpeg_finish_compress.  Multipass compression
     105                 :  * modes are not supported at all with suspension, so those two are the only
     106                 :  * points where markers will be written.
     107                 :  */
     108                 : 
     109                 : LOCAL(void)
     110            1875 : emit_byte (j_compress_ptr cinfo, int val)
     111                 : /* Emit a byte */
     112                 : {
     113            1875 :   struct jpeg_destination_mgr * dest = cinfo->dest;
     114                 : 
     115            1875 :   *(dest->next_output_byte)++ = (JOCTET) val;
     116            1875 :   if (--dest->free_in_buffer == 0) {
     117               0 :     if (! (*dest->empty_output_buffer) (cinfo))
     118               0 :       ERREXIT(cinfo, JERR_CANT_SUSPEND);
     119                 :   }
     120            1875 : }
     121                 : 
     122                 : 
     123                 : LOCAL(void)
     124              33 : emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
     125                 : /* Emit a marker code */
     126                 : {
     127              33 :   emit_byte(cinfo, 0xFF);
     128              33 :   emit_byte(cinfo, (int) mark);
     129              33 : }
     130                 : 
     131                 : 
     132                 : LOCAL(void)
     133              39 : emit_2bytes (j_compress_ptr cinfo, int value)
     134                 : /* Emit a 2-byte integer; these are always MSB first in JPEG files */
     135                 : {
     136              39 :   emit_byte(cinfo, (value >> 8) & 0xFF);
     137              39 :   emit_byte(cinfo, value & 0xFF);
     138              39 : }
     139                 : 
     140                 : 
     141                 : /*
     142                 :  * Routines to write specific marker types.
     143                 :  */
     144                 : 
     145                 : LOCAL(int)
     146               9 : emit_dqt (j_compress_ptr cinfo, int index)
     147                 : /* Emit a DQT marker */
     148                 : /* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
     149                 : {
     150               9 :   JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
     151                 :   int prec;
     152                 :   int i;
     153                 : 
     154               9 :   if (qtbl == NULL)
     155               0 :     ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
     156                 : 
     157               9 :   prec = 0;
     158             585 :   for (i = 0; i < DCTSIZE2; i++) {
     159             576 :     if (qtbl->quantval[i] > 255)
     160               0 :       prec = 1;
     161                 :   }
     162                 : 
     163               9 :   if (! qtbl->sent_table) {
     164               6 :     emit_marker(cinfo, M_DQT);
     165                 : 
     166               6 :     emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
     167                 : 
     168               6 :     emit_byte(cinfo, index + (prec<<4));
     169                 : 
     170             390 :     for (i = 0; i < DCTSIZE2; i++) {
     171                 :       /* The table entries must be emitted in zigzag order. */
     172             384 :       unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
     173             384 :       if (prec)
     174               0 :         emit_byte(cinfo, (int) (qval >> 8));
     175             384 :       emit_byte(cinfo, (int) (qval & 0xFF));
     176                 :     }
     177                 : 
     178               6 :     qtbl->sent_table = TRUE;
     179                 :   }
     180                 : 
     181               9 :   return prec;
     182                 : }
     183                 : 
     184                 : 
     185                 : LOCAL(void)
     186              18 : emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
     187                 : /* Emit a DHT marker */
     188                 : {
     189                 :   JHUFF_TBL * htbl;
     190                 :   int length, i;
     191                 :   
     192              18 :   if (is_ac) {
     193               9 :     htbl = cinfo->ac_huff_tbl_ptrs[index];
     194               9 :     index += 0x10;              /* output index has AC bit set */
     195                 :   } else {
     196               9 :     htbl = cinfo->dc_huff_tbl_ptrs[index];
     197                 :   }
     198                 : 
     199              18 :   if (htbl == NULL)
     200               0 :     ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
     201                 :   
     202              18 :   if (! htbl->sent_table) {
     203              12 :     emit_marker(cinfo, M_DHT);
     204                 :     
     205              12 :     length = 0;
     206             204 :     for (i = 1; i <= 16; i++)
     207             192 :       length += htbl->bits[i];
     208                 :     
     209              12 :     emit_2bytes(cinfo, length + 2 + 1 + 16);
     210              12 :     emit_byte(cinfo, index);
     211                 :     
     212             204 :     for (i = 1; i <= 16; i++)
     213             192 :       emit_byte(cinfo, htbl->bits[i]);
     214                 :     
     215            1056 :     for (i = 0; i < length; i++)
     216            1044 :       emit_byte(cinfo, htbl->huffval[i]);
     217                 :     
     218              12 :     htbl->sent_table = TRUE;
     219                 :   }
     220              18 : }
     221                 : 
     222                 : 
     223                 : LOCAL(void)
     224               0 : emit_dac (j_compress_ptr cinfo)
     225                 : /* Emit a DAC marker */
     226                 : /* Since the useful info is so small, we want to emit all the tables in */
     227                 : /* one DAC marker.  Therefore this routine does its own scan of the table. */
     228                 : {
     229                 : #ifdef C_ARITH_CODING_SUPPORTED
     230                 :   char dc_in_use[NUM_ARITH_TBLS];
     231                 :   char ac_in_use[NUM_ARITH_TBLS];
     232                 :   int length, i;
     233                 :   jpeg_component_info *compptr;
     234                 :   
     235                 :   for (i = 0; i < NUM_ARITH_TBLS; i++)
     236                 :     dc_in_use[i] = ac_in_use[i] = 0;
     237                 :   
     238                 :   for (i = 0; i < cinfo->comps_in_scan; i++) {
     239                 :     compptr = cinfo->cur_comp_info[i];
     240                 :     dc_in_use[compptr->dc_tbl_no] = 1;
     241                 :     ac_in_use[compptr->ac_tbl_no] = 1;
     242                 :   }
     243                 :   
     244                 :   length = 0;
     245                 :   for (i = 0; i < NUM_ARITH_TBLS; i++)
     246                 :     length += dc_in_use[i] + ac_in_use[i];
     247                 :   
     248                 :   emit_marker(cinfo, M_DAC);
     249                 :   
     250                 :   emit_2bytes(cinfo, length*2 + 2);
     251                 :   
     252                 :   for (i = 0; i < NUM_ARITH_TBLS; i++) {
     253                 :     if (dc_in_use[i]) {
     254                 :       emit_byte(cinfo, i);
     255                 :       emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
     256                 :     }
     257                 :     if (ac_in_use[i]) {
     258                 :       emit_byte(cinfo, i + 0x10);
     259                 :       emit_byte(cinfo, cinfo->arith_ac_K[i]);
     260                 :     }
     261                 :   }
     262                 : #endif /* C_ARITH_CODING_SUPPORTED */
     263               0 : }
     264                 : 
     265                 : 
     266                 : LOCAL(void)
     267               0 : emit_dri (j_compress_ptr cinfo)
     268                 : /* Emit a DRI marker */
     269                 : {
     270               0 :   emit_marker(cinfo, M_DRI);
     271                 :   
     272               0 :   emit_2bytes(cinfo, 4);        /* fixed length */
     273                 : 
     274               0 :   emit_2bytes(cinfo, (int) cinfo->restart_interval);
     275               0 : }
     276                 : 
     277                 : 
     278                 : LOCAL(void)
     279               3 : emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
     280                 : /* Emit a SOF marker */
     281                 : {
     282                 :   int ci;
     283                 :   jpeg_component_info *compptr;
     284                 :   
     285               3 :   emit_marker(cinfo, code);
     286                 :   
     287               3 :   emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
     288                 : 
     289                 :   /* Make sure image isn't bigger than SOF field can handle */
     290               6 :   if ((long) cinfo->_jpeg_height > 65535L ||
     291               3 :       (long) cinfo->_jpeg_width > 65535L)
     292               0 :     ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
     293                 : 
     294               3 :   emit_byte(cinfo, cinfo->data_precision);
     295               3 :   emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
     296               3 :   emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
     297                 : 
     298               3 :   emit_byte(cinfo, cinfo->num_components);
     299                 : 
     300              15 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     301               9 :        ci++, compptr++) {
     302               9 :     emit_byte(cinfo, compptr->component_id);
     303               9 :     emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
     304               9 :     emit_byte(cinfo, compptr->quant_tbl_no);
     305                 :   }
     306               3 : }
     307                 : 
     308                 : 
     309                 : LOCAL(void)
     310               3 : emit_sos (j_compress_ptr cinfo)
     311                 : /* Emit a SOS marker */
     312                 : {
     313                 :   int i, td, ta;
     314                 :   jpeg_component_info *compptr;
     315                 :   
     316               3 :   emit_marker(cinfo, M_SOS);
     317                 :   
     318               3 :   emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
     319                 :   
     320               3 :   emit_byte(cinfo, cinfo->comps_in_scan);
     321                 :   
     322              12 :   for (i = 0; i < cinfo->comps_in_scan; i++) {
     323               9 :     compptr = cinfo->cur_comp_info[i];
     324               9 :     emit_byte(cinfo, compptr->component_id);
     325               9 :     td = compptr->dc_tbl_no;
     326               9 :     ta = compptr->ac_tbl_no;
     327               9 :     if (cinfo->progressive_mode) {
     328                 :       /* Progressive mode: only DC or only AC tables are used in one scan;
     329                 :        * furthermore, Huffman coding of DC refinement uses no table at all.
     330                 :        * We emit 0 for unused field(s); this is recommended by the P&M text
     331                 :        * but does not seem to be specified in the standard.
     332                 :        */
     333               0 :       if (cinfo->Ss == 0) {
     334               0 :         ta = 0;                 /* DC scan */
     335               0 :         if (cinfo->Ah != 0 && !cinfo->arith_code)
     336               0 :           td = 0;               /* no DC table either */
     337                 :       } else {
     338               0 :         td = 0;                 /* AC scan */
     339                 :       }
     340                 :     }
     341               9 :     emit_byte(cinfo, (td << 4) + ta);
     342                 :   }
     343                 : 
     344               3 :   emit_byte(cinfo, cinfo->Ss);
     345               3 :   emit_byte(cinfo, cinfo->Se);
     346               3 :   emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
     347               3 : }
     348                 : 
     349                 : 
     350                 : LOCAL(void)
     351               3 : emit_jfif_app0 (j_compress_ptr cinfo)
     352                 : /* Emit a JFIF-compliant APP0 marker */
     353                 : {
     354                 :   /*
     355                 :    * Length of APP0 block       (2 bytes)
     356                 :    * Block ID                   (4 bytes - ASCII "JFIF")
     357                 :    * Zero byte                  (1 byte to terminate the ID string)
     358                 :    * Version Major, Minor       (2 bytes - major first)
     359                 :    * Units                      (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
     360                 :    * Xdpu                       (2 bytes - dots per unit horizontal)
     361                 :    * Ydpu                       (2 bytes - dots per unit vertical)
     362                 :    * Thumbnail X size           (1 byte)
     363                 :    * Thumbnail Y size           (1 byte)
     364                 :    */
     365                 :   
     366               3 :   emit_marker(cinfo, M_APP0);
     367                 :   
     368               3 :   emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
     369                 : 
     370               3 :   emit_byte(cinfo, 0x4A);       /* Identifier: ASCII "JFIF" */
     371               3 :   emit_byte(cinfo, 0x46);
     372               3 :   emit_byte(cinfo, 0x49);
     373               3 :   emit_byte(cinfo, 0x46);
     374               3 :   emit_byte(cinfo, 0);
     375               3 :   emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
     376               3 :   emit_byte(cinfo, cinfo->JFIF_minor_version);
     377               3 :   emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
     378               3 :   emit_2bytes(cinfo, (int) cinfo->X_density);
     379               3 :   emit_2bytes(cinfo, (int) cinfo->Y_density);
     380               3 :   emit_byte(cinfo, 0);          /* No thumbnail image */
     381               3 :   emit_byte(cinfo, 0);
     382               3 : }
     383                 : 
     384                 : 
     385                 : LOCAL(void)
     386               0 : emit_adobe_app14 (j_compress_ptr cinfo)
     387                 : /* Emit an Adobe APP14 marker */
     388                 : {
     389                 :   /*
     390                 :    * Length of APP14 block      (2 bytes)
     391                 :    * Block ID                   (5 bytes - ASCII "Adobe")
     392                 :    * Version Number             (2 bytes - currently 100)
     393                 :    * Flags0                     (2 bytes - currently 0)
     394                 :    * Flags1                     (2 bytes - currently 0)
     395                 :    * Color transform            (1 byte)
     396                 :    *
     397                 :    * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
     398                 :    * now in circulation seem to use Version = 100, so that's what we write.
     399                 :    *
     400                 :    * We write the color transform byte as 1 if the JPEG color space is
     401                 :    * YCbCr, 2 if it's YCCK, 0 otherwise.  Adobe's definition has to do with
     402                 :    * whether the encoder performed a transformation, which is pretty useless.
     403                 :    */
     404                 :   
     405               0 :   emit_marker(cinfo, M_APP14);
     406                 :   
     407               0 :   emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
     408                 : 
     409               0 :   emit_byte(cinfo, 0x41);       /* Identifier: ASCII "Adobe" */
     410               0 :   emit_byte(cinfo, 0x64);
     411               0 :   emit_byte(cinfo, 0x6F);
     412               0 :   emit_byte(cinfo, 0x62);
     413               0 :   emit_byte(cinfo, 0x65);
     414               0 :   emit_2bytes(cinfo, 100);      /* Version */
     415               0 :   emit_2bytes(cinfo, 0);        /* Flags0 */
     416               0 :   emit_2bytes(cinfo, 0);        /* Flags1 */
     417               0 :   switch (cinfo->jpeg_color_space) {
     418                 :   case JCS_YCbCr:
     419               0 :     emit_byte(cinfo, 1);        /* Color transform = 1 */
     420               0 :     break;
     421                 :   case JCS_YCCK:
     422               0 :     emit_byte(cinfo, 2);        /* Color transform = 2 */
     423               0 :     break;
     424                 :   default:
     425               0 :     emit_byte(cinfo, 0);        /* Color transform = 0 */
     426               0 :     break;
     427                 :   }
     428               0 : }
     429                 : 
     430                 : 
     431                 : /*
     432                 :  * These routines allow writing an arbitrary marker with parameters.
     433                 :  * The only intended use is to emit COM or APPn markers after calling
     434                 :  * write_file_header and before calling write_frame_header.
     435                 :  * Other uses are not guaranteed to produce desirable results.
     436                 :  * Counting the parameter bytes properly is the caller's responsibility.
     437                 :  */
     438                 : 
     439                 : METHODDEF(void)
     440               0 : write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
     441                 : /* Emit an arbitrary marker header */
     442                 : {
     443               0 :   if (datalen > (unsigned int) 65533)                /* safety check */
     444               0 :     ERREXIT(cinfo, JERR_BAD_LENGTH);
     445                 : 
     446               0 :   emit_marker(cinfo, (JPEG_MARKER) marker);
     447                 : 
     448               0 :   emit_2bytes(cinfo, (int) (datalen + 2));      /* total length */
     449               0 : }
     450                 : 
     451                 : METHODDEF(void)
     452               0 : write_marker_byte (j_compress_ptr cinfo, int val)
     453                 : /* Emit one byte of marker parameters following write_marker_header */
     454                 : {
     455               0 :   emit_byte(cinfo, val);
     456               0 : }
     457                 : 
     458                 : 
     459                 : /*
     460                 :  * Write datastream header.
     461                 :  * This consists of an SOI and optional APPn markers.
     462                 :  * We recommend use of the JFIF marker, but not the Adobe marker,
     463                 :  * when using YCbCr or grayscale data.  The JFIF marker should NOT
     464                 :  * be used for any other JPEG colorspace.  The Adobe marker is helpful
     465                 :  * to distinguish RGB, CMYK, and YCCK colorspaces.
     466                 :  * Note that an application can write additional header markers after
     467                 :  * jpeg_start_compress returns.
     468                 :  */
     469                 : 
     470                 : METHODDEF(void)
     471               3 : write_file_header (j_compress_ptr cinfo)
     472                 : {
     473               3 :   my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
     474                 : 
     475               3 :   emit_marker(cinfo, M_SOI);    /* first the SOI */
     476                 : 
     477                 :   /* SOI is defined to reset restart interval to 0 */
     478               3 :   marker->last_restart_interval = 0;
     479                 : 
     480               3 :   if (cinfo->write_JFIF_header)      /* next an optional JFIF APP0 */
     481               3 :     emit_jfif_app0(cinfo);
     482               3 :   if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
     483               0 :     emit_adobe_app14(cinfo);
     484               3 : }
     485                 : 
     486                 : 
     487                 : /*
     488                 :  * Write frame header.
     489                 :  * This consists of DQT and SOFn markers.
     490                 :  * Note that we do not emit the SOF until we have emitted the DQT(s).
     491                 :  * This avoids compatibility problems with incorrect implementations that
     492                 :  * try to error-check the quant table numbers as soon as they see the SOF.
     493                 :  */
     494                 : 
     495                 : METHODDEF(void)
     496               3 : write_frame_header (j_compress_ptr cinfo)
     497                 : {
     498                 :   int ci, prec;
     499                 :   boolean is_baseline;
     500                 :   jpeg_component_info *compptr;
     501                 :   
     502                 :   /* Emit DQT for each quantization table.
     503                 :    * Note that emit_dqt() suppresses any duplicate tables.
     504                 :    */
     505               3 :   prec = 0;
     506              15 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     507               9 :        ci++, compptr++) {
     508               9 :     prec += emit_dqt(cinfo, compptr->quant_tbl_no);
     509                 :   }
     510                 :   /* now prec is nonzero iff there are any 16-bit quant tables. */
     511                 : 
     512                 :   /* Check for a non-baseline specification.
     513                 :    * Note we assume that Huffman table numbers won't be changed later.
     514                 :    */
     515               6 :   if (cinfo->arith_code || cinfo->progressive_mode ||
     516               3 :       cinfo->data_precision != 8) {
     517               0 :     is_baseline = FALSE;
     518                 :   } else {
     519               3 :     is_baseline = TRUE;
     520              15 :     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     521               9 :          ci++, compptr++) {
     522               9 :       if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
     523               0 :         is_baseline = FALSE;
     524                 :     }
     525               3 :     if (prec && is_baseline) {
     526               0 :       is_baseline = FALSE;
     527                 :       /* If it's baseline except for quantizer size, warn the user */
     528               0 :       TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
     529                 :     }
     530                 :   }
     531                 : 
     532                 :   /* Emit the proper SOF marker */
     533               3 :   if (cinfo->arith_code) {
     534               0 :     emit_sof(cinfo, M_SOF9);    /* SOF code for arithmetic coding */
     535                 :   } else {
     536               3 :     if (cinfo->progressive_mode)
     537               0 :       emit_sof(cinfo, M_SOF2);  /* SOF code for progressive Huffman */
     538               3 :     else if (is_baseline)
     539               3 :       emit_sof(cinfo, M_SOF0);  /* SOF code for baseline implementation */
     540                 :     else
     541               0 :       emit_sof(cinfo, M_SOF1);  /* SOF code for non-baseline Huffman file */
     542                 :   }
     543               3 : }
     544                 : 
     545                 : 
     546                 : /*
     547                 :  * Write scan header.
     548                 :  * This consists of DHT or DAC markers, optional DRI, and SOS.
     549                 :  * Compressed data will be written following the SOS.
     550                 :  */
     551                 : 
     552                 : METHODDEF(void)
     553               3 : write_scan_header (j_compress_ptr cinfo)
     554                 : {
     555               3 :   my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
     556                 :   int i;
     557                 :   jpeg_component_info *compptr;
     558                 : 
     559               3 :   if (cinfo->arith_code) {
     560                 :     /* Emit arith conditioning info.  We may have some duplication
     561                 :      * if the file has multiple scans, but it's so small it's hardly
     562                 :      * worth worrying about.
     563                 :      */
     564               0 :     emit_dac(cinfo);
     565                 :   } else {
     566                 :     /* Emit Huffman tables.
     567                 :      * Note that emit_dht() suppresses any duplicate tables.
     568                 :      */
     569              12 :     for (i = 0; i < cinfo->comps_in_scan; i++) {
     570               9 :       compptr = cinfo->cur_comp_info[i];
     571               9 :       if (cinfo->progressive_mode) {
     572                 :         /* Progressive mode: only DC or only AC tables are used in one scan */
     573               0 :         if (cinfo->Ss == 0) {
     574               0 :           if (cinfo->Ah == 0)        /* DC needs no table for refinement scan */
     575               0 :             emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
     576                 :         } else {
     577               0 :           emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
     578                 :         }
     579                 :       } else {
     580                 :         /* Sequential mode: need both DC and AC tables */
     581               9 :         emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
     582               9 :         emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
     583                 :       }
     584                 :     }
     585                 :   }
     586                 : 
     587                 :   /* Emit DRI if required --- note that DRI value could change for each scan.
     588                 :    * We avoid wasting space with unnecessary DRIs, however.
     589                 :    */
     590               3 :   if (cinfo->restart_interval != marker->last_restart_interval) {
     591               0 :     emit_dri(cinfo);
     592               0 :     marker->last_restart_interval = cinfo->restart_interval;
     593                 :   }
     594                 : 
     595               3 :   emit_sos(cinfo);
     596               3 : }
     597                 : 
     598                 : 
     599                 : /*
     600                 :  * Write datastream trailer.
     601                 :  */
     602                 : 
     603                 : METHODDEF(void)
     604               3 : write_file_trailer (j_compress_ptr cinfo)
     605                 : {
     606               3 :   emit_marker(cinfo, M_EOI);
     607               3 : }
     608                 : 
     609                 : 
     610                 : /*
     611                 :  * Write an abbreviated table-specification datastream.
     612                 :  * This consists of SOI, DQT and DHT tables, and EOI.
     613                 :  * Any table that is defined and not marked sent_table = TRUE will be
     614                 :  * emitted.  Note that all tables will be marked sent_table = TRUE at exit.
     615                 :  */
     616                 : 
     617                 : METHODDEF(void)
     618               0 : write_tables_only (j_compress_ptr cinfo)
     619                 : {
     620                 :   int i;
     621                 : 
     622               0 :   emit_marker(cinfo, M_SOI);
     623                 : 
     624               0 :   for (i = 0; i < NUM_QUANT_TBLS; i++) {
     625               0 :     if (cinfo->quant_tbl_ptrs[i] != NULL)
     626               0 :       (void) emit_dqt(cinfo, i);
     627                 :   }
     628                 : 
     629               0 :   if (! cinfo->arith_code) {
     630               0 :     for (i = 0; i < NUM_HUFF_TBLS; i++) {
     631               0 :       if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
     632               0 :         emit_dht(cinfo, i, FALSE);
     633               0 :       if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
     634               0 :         emit_dht(cinfo, i, TRUE);
     635                 :     }
     636                 :   }
     637                 : 
     638               0 :   emit_marker(cinfo, M_EOI);
     639               0 : }
     640                 : 
     641                 : 
     642                 : /*
     643                 :  * Initialize the marker writer module.
     644                 :  */
     645                 : 
     646                 : GLOBAL(void)
     647               3 : jinit_marker_writer (j_compress_ptr cinfo)
     648                 : {
     649                 :   my_marker_ptr marker;
     650                 : 
     651                 :   /* Create the subobject */
     652               3 :   marker = (my_marker_ptr)
     653               3 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     654                 :                                 SIZEOF(my_marker_writer));
     655               3 :   cinfo->marker = (struct jpeg_marker_writer *) marker;
     656                 :   /* Initialize method pointers */
     657               3 :   marker->pub.write_file_header = write_file_header;
     658               3 :   marker->pub.write_frame_header = write_frame_header;
     659               3 :   marker->pub.write_scan_header = write_scan_header;
     660               3 :   marker->pub.write_file_trailer = write_file_trailer;
     661               3 :   marker->pub.write_tables_only = write_tables_only;
     662               3 :   marker->pub.write_marker_header = write_marker_header;
     663               3 :   marker->pub.write_marker_byte = write_marker_byte;
     664                 :   /* Initialize private state */
     665               3 :   marker->last_restart_interval = 0;
     666               3 : }

Generated by: LCOV version 1.7