LCOV - code coverage report
Current view: directory - media/libjpeg - jcapimin.c (source / functions) Found Hit Coverage
Test: app.info Lines: 95 45 47.4 %
Date: 2012-06-02 Functions: 9 4 44.4 %

       1                 : /*
       2                 :  * jcapimin.c
       3                 :  *
       4                 :  * Copyright (C) 1994-1998, Thomas G. Lane.
       5                 :  * Modified 2003-2010 by Guido Vollbeding.
       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 application interface code for the compression half
      10                 :  * of the JPEG library.  These are the "minimum" API routines that may be
      11                 :  * needed in either the normal full-compression case or the transcoding-only
      12                 :  * case.
      13                 :  *
      14                 :  * Most of the routines intended to be called directly by an application
      15                 :  * are in this file or in jcapistd.c.  But also see jcparam.c for
      16                 :  * parameter-setup helper routines, jcomapi.c for routines shared by
      17                 :  * compression and decompression, and jctrans.c for the transcoding case.
      18                 :  */
      19                 : 
      20                 : #define JPEG_INTERNALS
      21                 : #include "jinclude.h"
      22                 : #include "jpeglib.h"
      23                 : 
      24                 : 
      25                 : /*
      26                 :  * Initialization of a JPEG compression object.
      27                 :  * The error manager must already be set up (in case memory manager fails).
      28                 :  */
      29                 : 
      30                 : GLOBAL(void)
      31               3 : jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
      32                 : {
      33                 :   int i;
      34                 : 
      35                 :   /* Guard against version mismatches between library and caller. */
      36               3 :   cinfo->mem = NULL;         /* so jpeg_destroy knows mem mgr not called */
      37               3 :   if (version != JPEG_LIB_VERSION)
      38               0 :     ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
      39               3 :   if (structsize != SIZEOF(struct jpeg_compress_struct))
      40               0 :     ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
      41                 :              (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
      42                 : 
      43                 :   /* For debugging purposes, we zero the whole master structure.
      44                 :    * But the application has already set the err pointer, and may have set
      45                 :    * client_data, so we have to save and restore those fields.
      46                 :    * Note: if application hasn't set client_data, tools like Purify may
      47                 :    * complain here.
      48                 :    */
      49                 :   {
      50               3 :     struct jpeg_error_mgr * err = cinfo->err;
      51               3 :     void * client_data = cinfo->client_data; /* ignore Purify complaint here */
      52               3 :     MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
      53               3 :     cinfo->err = err;
      54               3 :     cinfo->client_data = client_data;
      55                 :   }
      56               3 :   cinfo->is_decompressor = FALSE;
      57                 : 
      58                 :   /* Initialize a memory manager instance for this object */
      59               3 :   jinit_memory_mgr((j_common_ptr) cinfo);
      60                 : 
      61                 :   /* Zero out pointers to permanent structures. */
      62               3 :   cinfo->progress = NULL;
      63               3 :   cinfo->dest = NULL;
      64                 : 
      65               3 :   cinfo->comp_info = NULL;
      66                 : 
      67              15 :   for (i = 0; i < NUM_QUANT_TBLS; i++) {
      68              12 :     cinfo->quant_tbl_ptrs[i] = NULL;
      69                 : #if JPEG_LIB_VERSION >= 70
      70                 :     cinfo->q_scale_factor[i] = 100;
      71                 : #endif
      72                 :   }
      73                 : 
      74              15 :   for (i = 0; i < NUM_HUFF_TBLS; i++) {
      75              12 :     cinfo->dc_huff_tbl_ptrs[i] = NULL;
      76              12 :     cinfo->ac_huff_tbl_ptrs[i] = NULL;
      77                 :   }
      78                 : 
      79                 : #if JPEG_LIB_VERSION >= 80
      80                 :   /* Must do it here for emit_dqt in case jpeg_write_tables is used */
      81                 :   cinfo->block_size = DCTSIZE;
      82                 :   cinfo->natural_order = jpeg_natural_order;
      83                 :   cinfo->lim_Se = DCTSIZE2-1;
      84                 : #endif
      85                 : 
      86               3 :   cinfo->script_space = NULL;
      87                 : 
      88               3 :   cinfo->input_gamma = 1.0;  /* in case application forgets */
      89                 : 
      90                 :   /* OK, I'm ready */
      91               3 :   cinfo->global_state = CSTATE_START;
      92               3 : }
      93                 : 
      94                 : 
      95                 : /*
      96                 :  * Destruction of a JPEG compression object
      97                 :  */
      98                 : 
      99                 : GLOBAL(void)
     100               3 : jpeg_destroy_compress (j_compress_ptr cinfo)
     101                 : {
     102               3 :   jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
     103               3 : }
     104                 : 
     105                 : 
     106                 : /*
     107                 :  * Abort processing of a JPEG compression operation,
     108                 :  * but don't destroy the object itself.
     109                 :  */
     110                 : 
     111                 : GLOBAL(void)
     112               0 : jpeg_abort_compress (j_compress_ptr cinfo)
     113                 : {
     114               0 :   jpeg_abort((j_common_ptr) cinfo); /* use common routine */
     115               0 : }
     116                 : 
     117                 : 
     118                 : /*
     119                 :  * Forcibly suppress or un-suppress all quantization and Huffman tables.
     120                 :  * Marks all currently defined tables as already written (if suppress)
     121                 :  * or not written (if !suppress).  This will control whether they get emitted
     122                 :  * by a subsequent jpeg_start_compress call.
     123                 :  *
     124                 :  * This routine is exported for use by applications that want to produce
     125                 :  * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
     126                 :  * since it is called by jpeg_start_compress, we put it here --- otherwise
     127                 :  * jcparam.o would be linked whether the application used it or not.
     128                 :  */
     129                 : 
     130                 : GLOBAL(void)
     131               3 : jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
     132                 : {
     133                 :   int i;
     134                 :   JQUANT_TBL * qtbl;
     135                 :   JHUFF_TBL * htbl;
     136                 : 
     137              15 :   for (i = 0; i < NUM_QUANT_TBLS; i++) {
     138              12 :     if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
     139               6 :       qtbl->sent_table = suppress;
     140                 :   }
     141                 : 
     142              15 :   for (i = 0; i < NUM_HUFF_TBLS; i++) {
     143              12 :     if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
     144               6 :       htbl->sent_table = suppress;
     145              12 :     if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
     146               6 :       htbl->sent_table = suppress;
     147                 :   }
     148               3 : }
     149                 : 
     150                 : 
     151                 : /*
     152                 :  * Finish JPEG compression.
     153                 :  *
     154                 :  * If a multipass operating mode was selected, this may do a great deal of
     155                 :  * work including most of the actual output.
     156                 :  */
     157                 : 
     158                 : GLOBAL(void)
     159               3 : jpeg_finish_compress (j_compress_ptr cinfo)
     160                 : {
     161                 :   JDIMENSION iMCU_row;
     162                 : 
     163               3 :   if (cinfo->global_state == CSTATE_SCANNING ||
     164               0 :       cinfo->global_state == CSTATE_RAW_OK) {
     165                 :     /* Terminate first pass */
     166               3 :     if (cinfo->next_scanline < cinfo->image_height)
     167               0 :       ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
     168               3 :     (*cinfo->master->finish_pass) (cinfo);
     169               0 :   } else if (cinfo->global_state != CSTATE_WRCOEFS)
     170               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
     171                 :   /* Perform any remaining passes */
     172               6 :   while (! cinfo->master->is_last_pass) {
     173               0 :     (*cinfo->master->prepare_for_pass) (cinfo);
     174               0 :     for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
     175               0 :       if (cinfo->progress != NULL) {
     176               0 :         cinfo->progress->pass_counter = (long) iMCU_row;
     177               0 :         cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
     178               0 :         (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
     179                 :       }
     180                 :       /* We bypass the main controller and invoke coef controller directly;
     181                 :        * all work is being done from the coefficient buffer.
     182                 :        */
     183               0 :       if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
     184               0 :         ERREXIT(cinfo, JERR_CANT_SUSPEND);
     185                 :     }
     186               0 :     (*cinfo->master->finish_pass) (cinfo);
     187                 :   }
     188                 :   /* Write EOI, do final cleanup */
     189               3 :   (*cinfo->marker->write_file_trailer) (cinfo);
     190               3 :   (*cinfo->dest->term_destination) (cinfo);
     191                 :   /* We can use jpeg_abort to release memory and reset global_state */
     192               3 :   jpeg_abort((j_common_ptr) cinfo);
     193               3 : }
     194                 : 
     195                 : 
     196                 : /*
     197                 :  * Write a special marker.
     198                 :  * This is only recommended for writing COM or APPn markers.
     199                 :  * Must be called after jpeg_start_compress() and before
     200                 :  * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
     201                 :  */
     202                 : 
     203                 : GLOBAL(void)
     204               0 : jpeg_write_marker (j_compress_ptr cinfo, int marker,
     205                 :                    const JOCTET *dataptr, unsigned int datalen)
     206                 : {
     207                 :   JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
     208                 : 
     209               0 :   if (cinfo->next_scanline != 0 ||
     210               0 :       (cinfo->global_state != CSTATE_SCANNING &&
     211               0 :        cinfo->global_state != CSTATE_RAW_OK &&
     212               0 :        cinfo->global_state != CSTATE_WRCOEFS))
     213               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
     214                 : 
     215               0 :   (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
     216               0 :   write_marker_byte = cinfo->marker->write_marker_byte;   /* copy for speed */
     217               0 :   while (datalen--) {
     218               0 :     (*write_marker_byte) (cinfo, *dataptr);
     219               0 :     dataptr++;
     220                 :   }
     221               0 : }
     222                 : 
     223                 : /* Same, but piecemeal. */
     224                 : 
     225                 : GLOBAL(void)
     226               0 : jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
     227                 : {
     228               0 :   if (cinfo->next_scanline != 0 ||
     229               0 :       (cinfo->global_state != CSTATE_SCANNING &&
     230               0 :        cinfo->global_state != CSTATE_RAW_OK &&
     231               0 :        cinfo->global_state != CSTATE_WRCOEFS))
     232               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
     233                 : 
     234               0 :   (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
     235               0 : }
     236                 : 
     237                 : GLOBAL(void)
     238               0 : jpeg_write_m_byte (j_compress_ptr cinfo, int val)
     239                 : {
     240               0 :   (*cinfo->marker->write_marker_byte) (cinfo, val);
     241               0 : }
     242                 : 
     243                 : 
     244                 : /*
     245                 :  * Alternate compression function: just write an abbreviated table file.
     246                 :  * Before calling this, all parameters and a data destination must be set up.
     247                 :  *
     248                 :  * To produce a pair of files containing abbreviated tables and abbreviated
     249                 :  * image data, one would proceed as follows:
     250                 :  *
     251                 :  *              initialize JPEG object
     252                 :  *              set JPEG parameters
     253                 :  *              set destination to table file
     254                 :  *              jpeg_write_tables(cinfo);
     255                 :  *              set destination to image file
     256                 :  *              jpeg_start_compress(cinfo, FALSE);
     257                 :  *              write data...
     258                 :  *              jpeg_finish_compress(cinfo);
     259                 :  *
     260                 :  * jpeg_write_tables has the side effect of marking all tables written
     261                 :  * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
     262                 :  * will not re-emit the tables unless it is passed write_all_tables=TRUE.
     263                 :  */
     264                 : 
     265                 : GLOBAL(void)
     266               0 : jpeg_write_tables (j_compress_ptr cinfo)
     267                 : {
     268               0 :   if (cinfo->global_state != CSTATE_START)
     269               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
     270                 : 
     271                 :   /* (Re)initialize error mgr and destination modules */
     272               0 :   (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
     273               0 :   (*cinfo->dest->init_destination) (cinfo);
     274                 :   /* Initialize the marker writer ... bit of a crock to do it here. */
     275               0 :   jinit_marker_writer(cinfo);
     276                 :   /* Write them tables! */
     277               0 :   (*cinfo->marker->write_tables_only) (cinfo);
     278                 :   /* And clean up. */
     279               0 :   (*cinfo->dest->term_destination) (cinfo);
     280                 :   /*
     281                 :    * In library releases up through v6a, we called jpeg_abort() here to free
     282                 :    * any working memory allocated by the destination manager and marker
     283                 :    * writer.  Some applications had a problem with that: they allocated space
     284                 :    * of their own from the library memory manager, and didn't want it to go
     285                 :    * away during write_tables.  So now we do nothing.  This will cause a
     286                 :    * memory leak if an app calls write_tables repeatedly without doing a full
     287                 :    * compression cycle or otherwise resetting the JPEG object.  However, that
     288                 :    * seems less bad than unexpectedly freeing memory in the normal case.
     289                 :    * An app that prefers the old behavior can call jpeg_abort for itself after
     290                 :    * each call to jpeg_write_tables().
     291                 :    */
     292               0 : }

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