LCOV - code coverage report
Current view: directory - media/libjpeg - jccoefct.c (source / functions) Found Hit Coverage
Test: app.info Lines: 162 56 34.6 %
Date: 2012-06-02 Functions: 6 4 66.7 %

       1                 : /*
       2                 :  * jccoefct.c
       3                 :  *
       4                 :  * Copyright (C) 1994-1997, Thomas G. Lane.
       5                 :  * This file is part of the Independent JPEG Group's software.
       6                 :  * For conditions of distribution and use, see the accompanying README file.
       7                 :  *
       8                 :  * This file contains the coefficient buffer controller for compression.
       9                 :  * This controller is the top level of the JPEG compressor proper.
      10                 :  * The coefficient buffer lies between forward-DCT and entropy encoding steps.
      11                 :  */
      12                 : 
      13                 : #define JPEG_INTERNALS
      14                 : #include "jinclude.h"
      15                 : #include "jpeglib.h"
      16                 : 
      17                 : 
      18                 : /* We use a full-image coefficient buffer when doing Huffman optimization,
      19                 :  * and also for writing multiple-scan JPEG files.  In all cases, the DCT
      20                 :  * step is run during the first pass, and subsequent passes need only read
      21                 :  * the buffered coefficients.
      22                 :  */
      23                 : #ifdef ENTROPY_OPT_SUPPORTED
      24                 : #define FULL_COEF_BUFFER_SUPPORTED
      25                 : #else
      26                 : #ifdef C_MULTISCAN_FILES_SUPPORTED
      27                 : #define FULL_COEF_BUFFER_SUPPORTED
      28                 : #endif
      29                 : #endif
      30                 : 
      31                 : 
      32                 : /* Private buffer controller object */
      33                 : 
      34                 : typedef struct {
      35                 :   struct jpeg_c_coef_controller pub; /* public fields */
      36                 : 
      37                 :   JDIMENSION iMCU_row_num;      /* iMCU row # within image */
      38                 :   JDIMENSION mcu_ctr;           /* counts MCUs processed in current row */
      39                 :   int MCU_vert_offset;          /* counts MCU rows within iMCU row */
      40                 :   int MCU_rows_per_iMCU_row;    /* number of such rows needed */
      41                 : 
      42                 :   /* For single-pass compression, it's sufficient to buffer just one MCU
      43                 :    * (although this may prove a bit slow in practice).  We allocate a
      44                 :    * workspace of C_MAX_BLOCKS_IN_MCU coefficient blocks, and reuse it for each
      45                 :    * MCU constructed and sent.  (On 80x86, the workspace is FAR even though
      46                 :    * it's not really very big; this is to keep the module interfaces unchanged
      47                 :    * when a large coefficient buffer is necessary.)
      48                 :    * In multi-pass modes, this array points to the current MCU's blocks
      49                 :    * within the virtual arrays.
      50                 :    */
      51                 :   JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
      52                 : 
      53                 :   /* In multi-pass modes, we need a virtual block array for each component. */
      54                 :   jvirt_barray_ptr whole_image[MAX_COMPONENTS];
      55                 : } my_coef_controller;
      56                 : 
      57                 : typedef my_coef_controller * my_coef_ptr;
      58                 : 
      59                 : 
      60                 : /* Forward declarations */
      61                 : METHODDEF(boolean) compress_data
      62                 :     JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
      63                 : #ifdef FULL_COEF_BUFFER_SUPPORTED
      64                 : METHODDEF(boolean) compress_first_pass
      65                 :     JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
      66                 : METHODDEF(boolean) compress_output
      67                 :     JPP((j_compress_ptr cinfo, JSAMPIMAGE input_buf));
      68                 : #endif
      69                 : 
      70                 : 
      71                 : LOCAL(void)
      72              21 : start_iMCU_row (j_compress_ptr cinfo)
      73                 : /* Reset within-iMCU-row counters for a new row */
      74                 : {
      75              21 :   my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
      76                 : 
      77                 :   /* In an interleaved scan, an MCU row is the same as an iMCU row.
      78                 :    * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
      79                 :    * But at the bottom of the image, process only what's left.
      80                 :    */
      81              21 :   if (cinfo->comps_in_scan > 1) {
      82              21 :     coef->MCU_rows_per_iMCU_row = 1;
      83                 :   } else {
      84               0 :     if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
      85               0 :       coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
      86                 :     else
      87               0 :       coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
      88                 :   }
      89                 : 
      90              21 :   coef->mcu_ctr = 0;
      91              21 :   coef->MCU_vert_offset = 0;
      92              21 : }
      93                 : 
      94                 : 
      95                 : /*
      96                 :  * Initialize for a processing pass.
      97                 :  */
      98                 : 
      99                 : METHODDEF(void)
     100               3 : start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
     101                 : {
     102               3 :   my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
     103                 : 
     104               3 :   coef->iMCU_row_num = 0;
     105               3 :   start_iMCU_row(cinfo);
     106                 : 
     107               3 :   switch (pass_mode) {
     108                 :   case JBUF_PASS_THRU:
     109               3 :     if (coef->whole_image[0] != NULL)
     110               0 :       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     111               3 :     coef->pub.compress_data = compress_data;
     112               3 :     break;
     113                 : #ifdef FULL_COEF_BUFFER_SUPPORTED
     114                 :   case JBUF_SAVE_AND_PASS:
     115               0 :     if (coef->whole_image[0] == NULL)
     116               0 :       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     117               0 :     coef->pub.compress_data = compress_first_pass;
     118               0 :     break;
     119                 :   case JBUF_CRANK_DEST:
     120               0 :     if (coef->whole_image[0] == NULL)
     121               0 :       ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     122               0 :     coef->pub.compress_data = compress_output;
     123               0 :     break;
     124                 : #endif
     125                 :   default:
     126               0 :     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     127               0 :     break;
     128                 :   }
     129               3 : }
     130                 : 
     131                 : 
     132                 : /*
     133                 :  * Process some data in the single-pass case.
     134                 :  * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
     135                 :  * per call, ie, v_samp_factor block rows for each component in the image.
     136                 :  * Returns TRUE if the iMCU row is completed, FALSE if suspended.
     137                 :  *
     138                 :  * NB: input_buf contains a plane for each component in image,
     139                 :  * which we index according to the component's SOF position.
     140                 :  */
     141                 : 
     142                 : METHODDEF(boolean)
     143              18 : compress_data (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
     144                 : {
     145              18 :   my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
     146                 :   JDIMENSION MCU_col_num;       /* index of current MCU within row */
     147              18 :   JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
     148              18 :   JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
     149                 :   int blkn, bi, ci, yindex, yoffset, blockcnt;
     150                 :   JDIMENSION ypos, xpos;
     151                 :   jpeg_component_info *compptr;
     152                 : 
     153                 :   /* Loop to write as much as one whole iMCU row */
     154              54 :   for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
     155              18 :        yoffset++) {
     156             168 :     for (MCU_col_num = coef->mcu_ctr; MCU_col_num <= last_MCU_col;
     157             132 :          MCU_col_num++) {
     158                 :       /* Determine where data comes from in input_buf and do the DCT thing.
     159                 :        * Each call on forward_DCT processes a horizontal row of DCT blocks
     160                 :        * as wide as an MCU; we rely on having allocated the MCU_buffer[] blocks
     161                 :        * sequentially.  Dummy blocks at the right or bottom edge are filled in
     162                 :        * specially.  The data in them does not matter for image reconstruction,
     163                 :        * so we fill them with values that will encode to the smallest amount of
     164                 :        * data, viz: all zeroes in the AC entries, DC entries equal to previous
     165                 :        * block's DC value.  (Thanks to Thomas Kinsman for this idea.)
     166                 :        */
     167             132 :       blkn = 0;
     168             528 :       for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
     169             396 :         compptr = cinfo->cur_comp_info[ci];
     170             396 :         blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
     171             396 :                                                 : compptr->last_col_width;
     172             396 :         xpos = MCU_col_num * compptr->MCU_sample_width;
     173             396 :         ypos = yoffset * DCTSIZE; /* ypos == (yoffset+yindex) * DCTSIZE */
     174             792 :         for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
     175             450 :           if (coef->iMCU_row_num < last_iMCU_row ||
     176              54 :               yoffset+yindex < compptr->last_row_height) {
     177             792 :             (*cinfo->fdct->forward_DCT) (cinfo, compptr,
     178             396 :                                          input_buf[compptr->component_index],
     179                 :                                          coef->MCU_buffer[blkn],
     180                 :                                          ypos, xpos, (JDIMENSION) blockcnt);
     181             792 :             if (blockcnt < compptr->MCU_width) {
     182                 :               /* Create some dummy blocks at the right edge of the image. */
     183               0 :               jzero_far((void FAR *) coef->MCU_buffer[blkn + blockcnt],
     184               0 :                         (compptr->MCU_width - blockcnt) * SIZEOF(JBLOCK));
     185               0 :               for (bi = blockcnt; bi < compptr->MCU_width; bi++) {
     186               0 :                 coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn+bi-1][0][0];
     187                 :               }
     188                 :             }
     189                 :           } else {
     190                 :             /* Create a row of dummy blocks at the bottom of the image. */
     191               0 :             jzero_far((void FAR *) coef->MCU_buffer[blkn],
     192               0 :                       compptr->MCU_width * SIZEOF(JBLOCK));
     193               0 :             for (bi = 0; bi < compptr->MCU_width; bi++) {
     194               0 :               coef->MCU_buffer[blkn+bi][0][0] = coef->MCU_buffer[blkn-1][0][0];
     195                 :             }
     196                 :           }
     197             396 :           blkn += compptr->MCU_width;
     198             396 :           ypos += DCTSIZE;
     199                 :         }
     200                 :       }
     201                 :       /* Try to write the MCU.  In event of a suspension failure, we will
     202                 :        * re-DCT the MCU on restart (a bit inefficient, could be fixed...)
     203                 :        */
     204             132 :       if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
     205                 :         /* Suspension forced; update state counters and exit */
     206               0 :         coef->MCU_vert_offset = yoffset;
     207               0 :         coef->mcu_ctr = MCU_col_num;
     208               0 :         return FALSE;
     209                 :       }
     210                 :     }
     211                 :     /* Completed an MCU row, but perhaps not an iMCU row */
     212              18 :     coef->mcu_ctr = 0;
     213                 :   }
     214                 :   /* Completed the iMCU row, advance counters for next one */
     215              18 :   coef->iMCU_row_num++;
     216              18 :   start_iMCU_row(cinfo);
     217              18 :   return TRUE;
     218                 : }
     219                 : 
     220                 : 
     221                 : #ifdef FULL_COEF_BUFFER_SUPPORTED
     222                 : 
     223                 : /*
     224                 :  * Process some data in the first pass of a multi-pass case.
     225                 :  * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
     226                 :  * per call, ie, v_samp_factor block rows for each component in the image.
     227                 :  * This amount of data is read from the source buffer, DCT'd and quantized,
     228                 :  * and saved into the virtual arrays.  We also generate suitable dummy blocks
     229                 :  * as needed at the right and lower edges.  (The dummy blocks are constructed
     230                 :  * in the virtual arrays, which have been padded appropriately.)  This makes
     231                 :  * it possible for subsequent passes not to worry about real vs. dummy blocks.
     232                 :  *
     233                 :  * We must also emit the data to the entropy encoder.  This is conveniently
     234                 :  * done by calling compress_output() after we've loaded the current strip
     235                 :  * of the virtual arrays.
     236                 :  *
     237                 :  * NB: input_buf contains a plane for each component in image.  All
     238                 :  * components are DCT'd and loaded into the virtual arrays in this pass.
     239                 :  * However, it may be that only a subset of the components are emitted to
     240                 :  * the entropy encoder during this first pass; be careful about looking
     241                 :  * at the scan-dependent variables (MCU dimensions, etc).
     242                 :  */
     243                 : 
     244                 : METHODDEF(boolean)
     245               0 : compress_first_pass (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
     246                 : {
     247               0 :   my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
     248               0 :   JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
     249                 :   JDIMENSION blocks_across, MCUs_across, MCUindex;
     250                 :   int bi, ci, h_samp_factor, block_row, block_rows, ndummy;
     251                 :   JCOEF lastDC;
     252                 :   jpeg_component_info *compptr;
     253                 :   JBLOCKARRAY buffer;
     254                 :   JBLOCKROW thisblockrow, lastblockrow;
     255                 : 
     256               0 :   for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     257               0 :        ci++, compptr++) {
     258                 :     /* Align the virtual buffer for this component. */
     259               0 :     buffer = (*cinfo->mem->access_virt_barray)
     260               0 :       ((j_common_ptr) cinfo, coef->whole_image[ci],
     261               0 :        coef->iMCU_row_num * compptr->v_samp_factor,
     262               0 :        (JDIMENSION) compptr->v_samp_factor, TRUE);
     263                 :     /* Count non-dummy DCT block rows in this iMCU row. */
     264               0 :     if (coef->iMCU_row_num < last_iMCU_row)
     265               0 :       block_rows = compptr->v_samp_factor;
     266                 :     else {
     267                 :       /* NB: can't use last_row_height here, since may not be set! */
     268               0 :       block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
     269               0 :       if (block_rows == 0) block_rows = compptr->v_samp_factor;
     270                 :     }
     271               0 :     blocks_across = compptr->width_in_blocks;
     272               0 :     h_samp_factor = compptr->h_samp_factor;
     273                 :     /* Count number of dummy blocks to be added at the right margin. */
     274               0 :     ndummy = (int) (blocks_across % h_samp_factor);
     275               0 :     if (ndummy > 0)
     276               0 :       ndummy = h_samp_factor - ndummy;
     277                 :     /* Perform DCT for all non-dummy blocks in this iMCU row.  Each call
     278                 :      * on forward_DCT processes a complete horizontal row of DCT blocks.
     279                 :      */
     280               0 :     for (block_row = 0; block_row < block_rows; block_row++) {
     281               0 :       thisblockrow = buffer[block_row];
     282               0 :       (*cinfo->fdct->forward_DCT) (cinfo, compptr,
     283               0 :                                    input_buf[ci], thisblockrow,
     284               0 :                                    (JDIMENSION) (block_row * DCTSIZE),
     285                 :                                    (JDIMENSION) 0, blocks_across);
     286               0 :       if (ndummy > 0) {
     287                 :         /* Create dummy blocks at the right edge of the image. */
     288               0 :         thisblockrow += blocks_across; /* => first dummy block */
     289               0 :         jzero_far((void FAR *) thisblockrow, ndummy * SIZEOF(JBLOCK));
     290               0 :         lastDC = thisblockrow[-1][0];
     291               0 :         for (bi = 0; bi < ndummy; bi++) {
     292               0 :           thisblockrow[bi][0] = lastDC;
     293                 :         }
     294                 :       }
     295                 :     }
     296                 :     /* If at end of image, create dummy block rows as needed.
     297                 :      * The tricky part here is that within each MCU, we want the DC values
     298                 :      * of the dummy blocks to match the last real block's DC value.
     299                 :      * This squeezes a few more bytes out of the resulting file...
     300                 :      */
     301               0 :     if (coef->iMCU_row_num == last_iMCU_row) {
     302               0 :       blocks_across += ndummy;  /* include lower right corner */
     303               0 :       MCUs_across = blocks_across / h_samp_factor;
     304               0 :       for (block_row = block_rows; block_row < compptr->v_samp_factor;
     305               0 :            block_row++) {
     306               0 :         thisblockrow = buffer[block_row];
     307               0 :         lastblockrow = buffer[block_row-1];
     308               0 :         jzero_far((void FAR *) thisblockrow,
     309                 :                   (size_t) (blocks_across * SIZEOF(JBLOCK)));
     310               0 :         for (MCUindex = 0; MCUindex < MCUs_across; MCUindex++) {
     311               0 :           lastDC = lastblockrow[h_samp_factor-1][0];
     312               0 :           for (bi = 0; bi < h_samp_factor; bi++) {
     313               0 :             thisblockrow[bi][0] = lastDC;
     314                 :           }
     315               0 :           thisblockrow += h_samp_factor; /* advance to next MCU in row */
     316               0 :           lastblockrow += h_samp_factor;
     317                 :         }
     318                 :       }
     319                 :     }
     320                 :   }
     321                 :   /* NB: compress_output will increment iMCU_row_num if successful.
     322                 :    * A suspension return will result in redoing all the work above next time.
     323                 :    */
     324                 : 
     325                 :   /* Emit data to the entropy encoder, sharing code with subsequent passes */
     326               0 :   return compress_output(cinfo, input_buf);
     327                 : }
     328                 : 
     329                 : 
     330                 : /*
     331                 :  * Process some data in subsequent passes of a multi-pass case.
     332                 :  * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
     333                 :  * per call, ie, v_samp_factor block rows for each component in the scan.
     334                 :  * The data is obtained from the virtual arrays and fed to the entropy coder.
     335                 :  * Returns TRUE if the iMCU row is completed, FALSE if suspended.
     336                 :  *
     337                 :  * NB: input_buf is ignored; it is likely to be a NULL pointer.
     338                 :  */
     339                 : 
     340                 : METHODDEF(boolean)
     341               0 : compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
     342                 : {
     343               0 :   my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
     344                 :   JDIMENSION MCU_col_num;       /* index of current MCU within row */
     345                 :   int blkn, ci, xindex, yindex, yoffset;
     346                 :   JDIMENSION start_col;
     347                 :   JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
     348                 :   JBLOCKROW buffer_ptr;
     349                 :   jpeg_component_info *compptr;
     350                 : 
     351                 :   /* Align the virtual buffers for the components used in this scan.
     352                 :    * NB: during first pass, this is safe only because the buffers will
     353                 :    * already be aligned properly, so jmemmgr.c won't need to do any I/O.
     354                 :    */
     355               0 :   for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
     356               0 :     compptr = cinfo->cur_comp_info[ci];
     357               0 :     buffer[ci] = (*cinfo->mem->access_virt_barray)
     358               0 :       ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
     359               0 :        coef->iMCU_row_num * compptr->v_samp_factor,
     360               0 :        (JDIMENSION) compptr->v_samp_factor, FALSE);
     361                 :   }
     362                 : 
     363                 :   /* Loop to process one whole iMCU row */
     364               0 :   for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
     365               0 :        yoffset++) {
     366               0 :     for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
     367               0 :          MCU_col_num++) {
     368                 :       /* Construct list of pointers to DCT blocks belonging to this MCU */
     369               0 :       blkn = 0;                 /* index of current DCT block within MCU */
     370               0 :       for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
     371               0 :         compptr = cinfo->cur_comp_info[ci];
     372               0 :         start_col = MCU_col_num * compptr->MCU_width;
     373               0 :         for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
     374               0 :           buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
     375               0 :           for (xindex = 0; xindex < compptr->MCU_width; xindex++) {
     376               0 :             coef->MCU_buffer[blkn++] = buffer_ptr++;
     377                 :           }
     378                 :         }
     379                 :       }
     380                 :       /* Try to write the MCU. */
     381               0 :       if (! (*cinfo->entropy->encode_mcu) (cinfo, coef->MCU_buffer)) {
     382                 :         /* Suspension forced; update state counters and exit */
     383               0 :         coef->MCU_vert_offset = yoffset;
     384               0 :         coef->mcu_ctr = MCU_col_num;
     385               0 :         return FALSE;
     386                 :       }
     387                 :     }
     388                 :     /* Completed an MCU row, but perhaps not an iMCU row */
     389               0 :     coef->mcu_ctr = 0;
     390                 :   }
     391                 :   /* Completed the iMCU row, advance counters for next one */
     392               0 :   coef->iMCU_row_num++;
     393               0 :   start_iMCU_row(cinfo);
     394               0 :   return TRUE;
     395                 : }
     396                 : 
     397                 : #endif /* FULL_COEF_BUFFER_SUPPORTED */
     398                 : 
     399                 : 
     400                 : /*
     401                 :  * Initialize coefficient buffer controller.
     402                 :  */
     403                 : 
     404                 : GLOBAL(void)
     405               3 : jinit_c_coef_controller (j_compress_ptr cinfo, boolean need_full_buffer)
     406                 : {
     407                 :   my_coef_ptr coef;
     408                 : 
     409               3 :   coef = (my_coef_ptr)
     410               3 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     411                 :                                 SIZEOF(my_coef_controller));
     412               3 :   cinfo->coef = (struct jpeg_c_coef_controller *) coef;
     413               3 :   coef->pub.start_pass = start_pass_coef;
     414                 : 
     415                 :   /* Create the coefficient buffer. */
     416               3 :   if (need_full_buffer) {
     417                 : #ifdef FULL_COEF_BUFFER_SUPPORTED
     418                 :     /* Allocate a full-image virtual array for each component, */
     419                 :     /* padded to a multiple of samp_factor DCT blocks in each direction. */
     420                 :     int ci;
     421                 :     jpeg_component_info *compptr;
     422                 : 
     423               0 :     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
     424               0 :          ci++, compptr++) {
     425               0 :       coef->whole_image[ci] = (*cinfo->mem->request_virt_barray)
     426               0 :         ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
     427               0 :          (JDIMENSION) jround_up((long) compptr->width_in_blocks,
     428               0 :                                 (long) compptr->h_samp_factor),
     429               0 :          (JDIMENSION) jround_up((long) compptr->height_in_blocks,
     430               0 :                                 (long) compptr->v_samp_factor),
     431               0 :          (JDIMENSION) compptr->v_samp_factor);
     432                 :     }
     433                 : #else
     434                 :     ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
     435                 : #endif
     436                 :   } else {
     437                 :     /* We only need a single-MCU buffer. */
     438                 :     JBLOCKROW buffer;
     439                 :     int i;
     440                 : 
     441               3 :     buffer = (JBLOCKROW)
     442               3 :       (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     443                 :                                   C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
     444              33 :     for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
     445              30 :       coef->MCU_buffer[i] = buffer + i;
     446                 :     }
     447               3 :     coef->whole_image[0] = NULL; /* flag for no virtual arrays */
     448                 :   }
     449               3 : }

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