doom3-bfg/neo/renderer/jpeg-6/jdphuff.cpp

/*
 * jdphuff.c
 *
 * Copyright (C) 1995, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains Huffman entropy decoding routines for progressive JPEG.
 *
 * Much of the complexity here has to do with supporting input suspension.
 * If the data source module demands suspension, we want to be able to back
 * up to the start of the current MCU.  To do this, we copy state variables
 * into local working storage, and update them back to the permanent
 * storage only upon successful completion of an MCU.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jdhuff.h"      /* Declarations shared with jdhuff.c */


#ifdef D_PROGRESSIVE_SUPPORTED

/*
 * Expanded entropy decoder object for progressive Huffman decoding.
 *
 * The savable_state subrecord contains fields that change within an MCU,
 * but must not be updated permanently until we complete the MCU.
 */

typedef struct {
    unsigned int EOBRUN;        /* remaining EOBs in EOBRUN */
    int          last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
} savable_state;

/* This macro is to work around compilers with missing or broken
 * structure assignment.  You'll need to fix this code if you have
 * such a compiler and you change MAX_COMPS_IN_SCAN.
 */

#ifndef NO_STRUCT_ASSIGN
#define ASSIGN_STATE( dest, src )  ( ( dest ) = ( src ) )
#else
#if MAX_COMPS_IN_SCAN == 4
#define ASSIGN_STATE( dest, src )  \
    ( ( dest ).EOBRUN = ( src ).EOBRUN, \
     ( dest ).last_dc_val[0] = ( src ).last_dc_val[0], \
     ( dest ).last_dc_val[1] = ( src ).last_dc_val[1], \
     ( dest ).last_dc_val[2] = ( src ).last_dc_val[2], \
     ( dest ).last_dc_val[3] = ( src ).last_dc_val[3] )
#endif
#endif


typedef struct {
    struct jpeg_entropy_decoder pub;/* public fields */

    /* These fields are loaded into local variables at start of each MCU.
     * In case of suspension, we exit WITHOUT updating them.
     */
    bitread_perm_state bitstate;/* Bit buffer at start of MCU */
    savable_state      saved; /* Other state at start of MCU */

    /* These fields are NOT loaded into local working state. */
    unsigned int restarts_to_go;/* MCUs left in this restart interval */

    /* Pointers to derived tables (these workspaces have image lifespan) */
    d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];

    d_derived_tbl * ac_derived_tbl;/* active table during an AC scan */
} phuff_entropy_decoder;

typedef phuff_entropy_decoder * phuff_entropy_ptr;

/* Forward declarations */
METHODDEF boolean decode_mcu_DC_first JPP( ( j_decompress_ptr cinfo,
                                             JBLOCKROW * MCU_data ) );
METHODDEF boolean decode_mcu_AC_first JPP( ( j_decompress_ptr cinfo,
                                             JBLOCKROW * MCU_data ) );
METHODDEF boolean decode_mcu_DC_refine JPP( ( j_decompress_ptr cinfo,
                                              JBLOCKROW * MCU_data ) );
METHODDEF boolean decode_mcu_AC_refine JPP( ( j_decompress_ptr cinfo,
                                              JBLOCKROW * MCU_data ) );


/*
 * Initialize for a Huffman-compressed scan.
 */

METHODDEF void
start_pass_phuff_decoder( j_decompress_ptr cinfo ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    boolean is_DC_band, bad;
    int ci, coefi, tbl;
    int * coef_bit_ptr;
    jpeg_component_info * compptr;

    is_DC_band = ( cinfo->Ss == 0 );

    /* Validate scan parameters */
    bad = FALSE;
    if ( is_DC_band ) {
        if ( cinfo->Se != 0 ) {
            bad = TRUE;
        }
    } else {
        /* need not check Ss/Se < 0 since they came from unsigned bytes */
        if ( ( cinfo->Ss > cinfo->Se ) || ( cinfo->Se >= DCTSIZE2 ) ) {
            bad = TRUE;
        }
        /* AC scans may have only one component */
        if ( cinfo->comps_in_scan != 1 ) {
            bad = TRUE;
        }
    }
    if ( cinfo->Ah != 0 ) {
        /* Successive approximation refinement scan: must have Al = Ah-1. */
        if ( cinfo->Al != cinfo->Ah - 1 ) {
            bad = TRUE;
        }
    }
    if ( cinfo->Al > 13 ) { /* need not check for < 0 */
        bad = TRUE;
    }
    if ( bad ) {
        ERREXIT4( cinfo, JERR_BAD_PROGRESSION,
                  cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al );
    }
    /* Update progression status, and verify that scan order is legal.
     * Note that inter-scan inconsistencies are treated as warnings
     * not fatal errors ... not clear if this is right way to behave.
     */
    for ( ci = 0; ci < cinfo->comps_in_scan; ci++ ) {
        int cindex = cinfo->cur_comp_info[ci]->component_index;
        coef_bit_ptr = &cinfo->coef_bits[cindex][0];
        if ( ( !is_DC_band ) && ( coef_bit_ptr[0] < 0 ) ) {/* AC without prior DC scan */
            WARNMS2( cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0 );
        }
        for ( coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++ ) {
            int expected = ( coef_bit_ptr[coefi] < 0 ) ? 0 : coef_bit_ptr[coefi];
            if ( cinfo->Ah != expected ) {
                WARNMS2( cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi );
            }
            coef_bit_ptr[coefi] = cinfo->Al;
        }
    }

    /* Select MCU decoding routine */
    if ( cinfo->Ah == 0 ) {
        if ( is_DC_band ) {
            entropy->pub.decode_mcu = decode_mcu_DC_first;
        } else {
            entropy->pub.decode_mcu = decode_mcu_AC_first;
        }
    } else {
        if ( is_DC_band ) {
            entropy->pub.decode_mcu = decode_mcu_DC_refine;
        } else {
            entropy->pub.decode_mcu = decode_mcu_AC_refine;
        }
    }

    for ( ci = 0; ci < cinfo->comps_in_scan; ci++ ) {
        compptr = cinfo->cur_comp_info[ci];
        /* Make sure requested tables are present, and compute derived tables.
         * We may build same derived table more than once, but it's not expensive.
         */
        if ( is_DC_band ) {
            if ( cinfo->Ah == 0 ) {/* DC refinement needs no table */
                tbl = compptr->dc_tbl_no;
                if ( ( tbl < 0 ) || ( tbl >= NUM_HUFF_TBLS ) ||
                    ( cinfo->dc_huff_tbl_ptrs[tbl] == NULL ) ) {
                    ERREXIT1( cinfo, JERR_NO_HUFF_TABLE, tbl );
                }
                jpeg_make_d_derived_tbl( cinfo, cinfo->dc_huff_tbl_ptrs[tbl],
                                         &entropy->derived_tbls[tbl] );
            }
        } else {
            tbl = compptr->ac_tbl_no;
            if ( ( tbl < 0 ) || ( tbl >= NUM_HUFF_TBLS ) ||
                ( cinfo->ac_huff_tbl_ptrs[tbl] == NULL ) ) {
                ERREXIT1( cinfo, JERR_NO_HUFF_TABLE, tbl );
            }
            jpeg_make_d_derived_tbl( cinfo, cinfo->ac_huff_tbl_ptrs[tbl],
                                     &entropy->derived_tbls[tbl] );
            /* remember the single active table */
            entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
        }
        /* Initialize DC predictions to 0 */
        entropy->saved.last_dc_val[ci] = 0;
    }

    /* Initialize bitread state variables */
    entropy->bitstate.bits_left = 0;
    entropy->bitstate.get_buffer = 0;/* unnecessary, but keeps Purify quiet */
    entropy->bitstate.printed_eod = FALSE;

    /* Initialize private state variables */
    entropy->saved.EOBRUN = 0;

    /* Initialize restart counter */
    entropy->restarts_to_go = cinfo->restart_interval;
}


/*
 * Figure F.12: extend sign bit.
 * On some machines, a shift and add will be faster than a table lookup.
 */

#ifdef AVOID_TABLES

#define HUFF_EXTEND( x, s )  ( ( x ) < ( 1 << ( ( s ) - 1 ) ) ? ( x ) + ( ( ( -1 ) << ( s ) ) + 1 ) : ( x ) )

#else

#define HUFF_EXTEND( x, s )  ( ( x ) < extend_test[s] ? ( x ) + extend_offset[s] : ( x ) )

static const int extend_test[16] =   /* entry n is 2**(n-1) */
{ 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
  0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };

static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
{ 0, ( ( -1 ) << 1 ) + 1, ( ( -1 ) << 2 ) + 1, ( ( -1 ) << 3 ) + 1, ( ( -1 ) << 4 ) + 1,
  ( ( -1 ) << 5 ) + 1, ( ( -1 ) << 6 ) + 1, ( ( -1 ) << 7 ) + 1, ( ( -1 ) << 8 ) + 1,
  ( ( -1 ) << 9 ) + 1, ( ( -1 ) << 10 ) + 1, ( ( -1 ) << 11 ) + 1, ( ( -1 ) << 12 ) + 1,
  ( ( -1 ) << 13 ) + 1, ( ( -1 ) << 14 ) + 1, ( ( -1 ) << 15 ) + 1 };

#endif /* AVOID_TABLES */


/*
 * Check for a restart marker & resynchronize decoder.
 * Returns FALSE if must suspend.
 */

LOCAL boolean
process_restart( j_decompress_ptr cinfo ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    int ci;

    /* Throw away any unused bits remaining in bit buffer; */
    /* include any full bytes in next_marker's count of discarded bytes */
    cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
    entropy->bitstate.bits_left = 0;

    /* Advance past the RSTn marker */
    if ( !( *cinfo->marker->read_restart_marker )( cinfo ) ) {
        return FALSE;
    }

    /* Re-initialize DC predictions to 0 */
    for ( ci = 0; ci < cinfo->comps_in_scan; ci++ ) {
        entropy->saved.last_dc_val[ci] = 0;
    }
    /* Re-init EOB run count, too */
    entropy->saved.EOBRUN = 0;

    /* Reset restart counter */
    entropy->restarts_to_go = cinfo->restart_interval;

    /* Next segment can get another out-of-data warning */
    entropy->bitstate.printed_eod = FALSE;

    return TRUE;
}


/*
 * Huffman MCU decoding.
 * Each of these routines decodes and returns one MCU's worth of
 * Huffman-compressed coefficients.
 * The coefficients are reordered from zigzag order into natural array order,
 * but are not dequantized.
 *
 * The i'th block of the MCU is stored into the block pointed to by
 * MCU_data[i].  WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
 *
 * We return FALSE if data source requested suspension.  In that case no
 * changes have been made to permanent state.  (Exception: some output
 * coefficients may already have been assigned.  This is harmless for
 * spectral selection, since we'll just re-assign them on the next call.
 * Successive approximation AC refinement has to be more careful, however.)
 */

/*
 * MCU decoding for DC initial scan (either spectral selection,
 * or first pass of successive approximation).
 */

METHODDEF boolean
decode_mcu_DC_first( j_decompress_ptr cinfo, JBLOCKROW * MCU_data ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    int Al = cinfo->Al;
    register int s, r;
    int blkn, ci;
    JBLOCKROW block;
    BITREAD_STATE_VARS;
    savable_state state;
    d_derived_tbl * tbl;
    jpeg_component_info * compptr;

    /* Process restart marker if needed; may have to suspend */
    if ( cinfo->restart_interval ) {
        if ( entropy->restarts_to_go == 0 ) {
            if ( !process_restart( cinfo ) ) {
                return FALSE;
            }
        }
    }

    /* Load up working state */
    BITREAD_LOAD_STATE( cinfo, entropy->bitstate );
    ASSIGN_STATE( state, entropy->saved );

    /* Outer loop handles each block in the MCU */

    for ( blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++ ) {
        block = MCU_data[blkn];
        ci = cinfo->MCU_membership[blkn];
        compptr = cinfo->cur_comp_info[ci];
        tbl = entropy->derived_tbls[compptr->dc_tbl_no];

        /* Decode a single block's worth of coefficients */

        /* Section F.2.2.1: decode the DC coefficient difference */
        HUFF_DECODE( s, br_state, tbl, return FALSE, label1 );
        if ( s ) {
            CHECK_BIT_BUFFER( br_state, s, return FALSE );

            r = GET_BITS( s );
            s = HUFF_EXTEND( r, s );
        }

        /* Convert DC difference to actual value, update last_dc_val */
        s += state.last_dc_val[ci];
        state.last_dc_val[ci] = s;
        /* Scale and output the DC coefficient (assumes jpeg_natural_order[0]=0) */
        ( *block )[0] = (JCOEF) ( s << Al );
    }

    /* Completed MCU, so update state */
    BITREAD_SAVE_STATE( cinfo, entropy->bitstate );
    ASSIGN_STATE( entropy->saved, state );

    /* Account for restart interval (no-op if not using restarts) */
    entropy->restarts_to_go--;

    return TRUE;
}


/*
 * MCU decoding for AC initial scan (either spectral selection,
 * or first pass of successive approximation).
 */

METHODDEF boolean
decode_mcu_AC_first( j_decompress_ptr cinfo, JBLOCKROW * MCU_data ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    int Se = cinfo->Se;
    int Al = cinfo->Al;
    register int s, k, r;
    unsigned int EOBRUN;
    JBLOCKROW block;
    BITREAD_STATE_VARS;
    d_derived_tbl * tbl;

    /* Process restart marker if needed; may have to suspend */
    if ( cinfo->restart_interval ) {
        if ( entropy->restarts_to_go == 0 ) {
            if ( !process_restart( cinfo ) ) {
                return FALSE;
            }
        }
    }

    /* Load up working state.
     * We can avoid loading/saving bitread state if in an EOB run.
     */
    EOBRUN = entropy->saved.EOBRUN;/* only part of saved state we care about */

    /* There is always only one block per MCU */

    if ( EOBRUN > 0 ) { /* if it's a band of zeroes... */
        EOBRUN--;
    }                   /* ...process it now (we do nothing) */
    else {
        BITREAD_LOAD_STATE( cinfo, entropy->bitstate );
        block = MCU_data[0];
        tbl = entropy->ac_derived_tbl;

        for ( k = cinfo->Ss; k <= Se; k++ ) {
            HUFF_DECODE( s, br_state, tbl, return FALSE, label2 );
            r = s >> 4;
            s &= 15;
            if ( s ) {
                k += r;

                CHECK_BIT_BUFFER( br_state, s, return FALSE );
                r = GET_BITS( s );
                s = HUFF_EXTEND( r, s );
                /* Scale and output coefficient in natural (dezigzagged) order */
                ( *block )[jpeg_natural_order[k]] = (JCOEF) ( s << Al );
            } else {
                if ( r == 15 ) {/* ZRL */
                    k += 15;/* skip 15 zeroes in band */
                } else {/* EOBr, run length is 2^r + appended bits */
                    EOBRUN = 1 << r;
                    if ( r ) {/* EOBr, r > 0 */
                        CHECK_BIT_BUFFER( br_state, r, return FALSE );
                        r = GET_BITS( r );
                        EOBRUN += r;
                    }
                    EOBRUN--; /* this band is processed at this moment */
                    break; /* force end-of-band */
                }
            }
        }

        BITREAD_SAVE_STATE( cinfo, entropy->bitstate );
    }

    /* Completed MCU, so update state */
    entropy->saved.EOBRUN = EOBRUN;/* only part of saved state we care about */

    /* Account for restart interval (no-op if not using restarts) */
    entropy->restarts_to_go--;

    return TRUE;
}


/*
 * MCU decoding for DC successive approximation refinement scan.
 * Note: we assume such scans can be multi-component, although the spec
 * is not very clear on the point.
 */

METHODDEF boolean
decode_mcu_DC_refine( j_decompress_ptr cinfo, JBLOCKROW * MCU_data ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    int p1 = 1 << cinfo->Al;/* 1 in the bit position being coded */
    int blkn;
    JBLOCKROW block;
    BITREAD_STATE_VARS;

    /* Process restart marker if needed; may have to suspend */
    if ( cinfo->restart_interval ) {
        if ( entropy->restarts_to_go == 0 ) {
            if ( !process_restart( cinfo ) ) {
                return FALSE;
            }
        }
    }

    /* Load up working state */
    BITREAD_LOAD_STATE( cinfo, entropy->bitstate );

    /* Outer loop handles each block in the MCU */

    for ( blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++ ) {
        block = MCU_data[blkn];

        /* Encoded data is simply the next bit of the two's-complement DC value */
        CHECK_BIT_BUFFER( br_state, 1, return FALSE );
        if ( GET_BITS( 1 ) ) {
            ( *block )[0] |= p1;
        }
        /* Note: since we use |=, repeating the assignment later is safe */
    }

    /* Completed MCU, so update state */
    BITREAD_SAVE_STATE( cinfo, entropy->bitstate );

    /* Account for restart interval (no-op if not using restarts) */
    entropy->restarts_to_go--;

    return TRUE;
}


/*
 * MCU decoding for AC successive approximation refinement scan.
 */

METHODDEF boolean
decode_mcu_AC_refine( j_decompress_ptr cinfo, JBLOCKROW * MCU_data ) {
    phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
    int Se = cinfo->Se;
    int p1 = 1 << cinfo->Al;/* 1 in the bit position being coded */
    int m1 = ( -1 ) << cinfo->Al;/* -1 in the bit position being coded */
    register int s, k, r;
    unsigned int EOBRUN;
    JBLOCKROW block;
    JCOEFPTR thiscoef;
    BITREAD_STATE_VARS;
    d_derived_tbl * tbl;
    int num_newnz;
    int newnz_pos[DCTSIZE2];

    /* Process restart marker if needed; may have to suspend */
    if ( cinfo->restart_interval ) {
        if ( entropy->restarts_to_go == 0 ) {
            if ( !process_restart( cinfo ) ) {
                return FALSE;
            }
        }
    }

    /* Load up working state */
    BITREAD_LOAD_STATE( cinfo, entropy->bitstate );
    EOBRUN = entropy->saved.EOBRUN;/* only part of saved state we care about */

    /* There is always only one block per MCU */
    block = MCU_data[0];
    tbl = entropy->ac_derived_tbl;

    /* If we are forced to suspend, we must undo the assignments to any newly
     * nonzero coefficients in the block, because otherwise we'd get confused
     * next time about which coefficients were already nonzero.
     * But we need not undo addition of bits to already-nonzero coefficients;
     * instead, we can test the current bit position to see if we already did it.
     */
    num_newnz = 0;

    /* initialize coefficient loop counter to start of band */
    k = cinfo->Ss;

    if ( EOBRUN == 0 ) {
        for (; k <= Se; k++ ) {
            HUFF_DECODE( s, br_state, tbl, goto undoit, label3 );
            r = s >> 4;
            s &= 15;
            if ( s ) {
                if ( s != 1 ) {/* size of new coef should always be 1 */
                    WARNMS( cinfo, JWRN_HUFF_BAD_CODE );
                }
                CHECK_BIT_BUFFER( br_state, 1, goto undoit );
                if ( GET_BITS( 1 ) ) {
                    s = p1;
                }   /* newly nonzero coef is positive */
                else {
                    s = m1;
                }   /* newly nonzero coef is negative */
            } else {
                if ( r != 15 ) {
                    EOBRUN = 1 << r;/* EOBr, run length is 2^r + appended bits */
                    if ( r ) {
                        CHECK_BIT_BUFFER( br_state, r, goto undoit );
                        r = GET_BITS( r );
                        EOBRUN += r;
                    }
                    break; /* rest of block is handled by EOB logic */
                }
                /* note s = 0 for processing ZRL */
            }
            /* Advance over already-nonzero coefs and r still-zero coefs,
             * appending correction bits to the nonzeroes.  A correction bit is 1
             * if the absolute value of the coefficient must be increased.
             */
            do {
                thiscoef = *block + jpeg_natural_order[k];
                if ( *thiscoef != 0 ) {
                    CHECK_BIT_BUFFER( br_state, 1, goto undoit );
                    if ( GET_BITS( 1 ) ) {
                        if ( ( *thiscoef & p1 ) == 0 ) {/* do nothing if already changed it */
                            if ( *thiscoef >= 0 ) {
                                *thiscoef += p1;
                            } else {
                                *thiscoef += m1;
                            }
                        }
                    }
                } else {
                    if ( --r < 0 ) {
                        break;
                    } /* reached target zero coefficient */
                }
                k++;
            } while ( k <= Se );
            if ( s ) {
                int pos = jpeg_natural_order[k];
                /* Output newly nonzero coefficient */
                ( *block )[pos] = (JCOEF) s;
                /* Remember its position in case we have to suspend */
                newnz_pos[num_newnz++] = pos;
            }
        }
    }

    if ( EOBRUN > 0 ) {
        /* Scan any remaining coefficient positions after the end-of-band
         * (the last newly nonzero coefficient, if any).  Append a correction
         * bit to each already-nonzero coefficient.  A correction bit is 1
         * if the absolute value of the coefficient must be increased.
         */
        for (; k <= Se; k++ ) {
            thiscoef = *block + jpeg_natural_order[k];
            if ( *thiscoef != 0 ) {
                CHECK_BIT_BUFFER( br_state, 1, goto undoit );
                if ( GET_BITS( 1 ) ) {
                    if ( ( *thiscoef & p1 ) == 0 ) {/* do nothing if already changed it */
                        if ( *thiscoef >= 0 ) {
                            *thiscoef += p1;
                        } else {
                            *thiscoef += m1;
                        }
                    }
                }
            }
        }
        /* Count one block completed in EOB run */
        EOBRUN--;
    }

    /* Completed MCU, so update state */
    BITREAD_SAVE_STATE( cinfo, entropy->bitstate );
    entropy->saved.EOBRUN = EOBRUN;/* only part of saved state we care about */

    /* Account for restart interval (no-op if not using restarts) */
    entropy->restarts_to_go--;

    return TRUE;

undoit:
    /* Re-zero any output coefficients that we made newly nonzero */
    while ( num_newnz > 0 ) {
        ( *block )[newnz_pos[--num_newnz]] = 0;
    }

    return FALSE;
}


/*
 * Module initialization routine for progressive Huffman entropy decoding.
 */

GLOBAL void
jinit_phuff_decoder( j_decompress_ptr cinfo ) {
    phuff_entropy_ptr entropy;
    int * coef_bit_ptr;
    int ci, i;

    entropy = (phuff_entropy_ptr)
              ( *cinfo->mem->alloc_small )( (j_common_ptr) cinfo, JPOOL_IMAGE,
                                           SIZEOF( phuff_entropy_decoder ) );
    cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
    entropy->pub.start_pass = start_pass_phuff_decoder;

    /* Mark derived tables unallocated */
    for ( i = 0; i < NUM_HUFF_TBLS; i++ ) {
        entropy->derived_tbls[i] = NULL;
    }

    /* Create progression status table */
    cinfo->coef_bits = ( int ( * )[DCTSIZE2] )
                       ( *cinfo->mem->alloc_small ) ( (j_common_ptr) cinfo, JPOOL_IMAGE,
                                                     cinfo->num_components * DCTSIZE2 * SIZEOF( int ) );
    coef_bit_ptr = &cinfo->coef_bits[0][0];
    for ( ci = 0; ci < cinfo->num_components; ci++ ) {
        for ( i = 0; i < DCTSIZE2; i++ ) {
            *coef_bit_ptr++ = -1;
        }
    }
}

#endif /* D_PROGRESSIVE_SUPPORTED */