/*

 * jcinit.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1991-1997, Thomas G. Lane.

 * Lossless JPEG Modifications:

 * Copyright (C) 1999, Ken Murchison.

 * libjpeg-turbo Modifications:

 * Copyright (C) 2020, 2022, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * file.

 *

 * This file contains initialization logic for the JPEG compressor.

 * This routine is in charge of selecting the modules to be executed and

 * making an initialization call to each one.

 *

 * Logically, this code belongs in jcmaster.c.  It's split out because

 * linking this routine implies linking the entire compression library.

 * For a transcoding-only application, we want to be able to use jcmaster.c

 * without linking in the whole library.

 */

#define JPEG_INTERNALS

#include "jinclude.h"

#include "jpeglib.h"

#include "jpegapicomp.h"

/*

 * Master selection of compression modules.

 * This is done once at the start of processing an image.  We determine

 * which modules will be used and give them appropriate initialization calls.

 */

GLOBAL(void)

jinit_compress_master(j_compress_ptr cinfo)

{

  /* Initialize master control (includes parameter checking/processing) */

  jinit_c_master_control(cinfo, FALSE /* full compression */);

  /* Preprocessing */

  if (!cinfo->raw_data_in) {

    if (cinfo->data_precision == 16) {

#ifdef C_LOSSLESS_SUPPORTED

      j16init_color_converter(cinfo);

      j16init_downsampler(cinfo);

      j16init_c_prep_controller(cinfo,

                                FALSE /* never need full buffer here */);

#else

      ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

#endif

    } else if (cinfo->data_precision == 12) {

      j12init_color_converter(cinfo);

      j12init_downsampler(cinfo);

      j12init_c_prep_controller(cinfo,

                                FALSE /* never need full buffer here */);

    } else {

      jinit_color_converter(cinfo);

      jinit_downsampler(cinfo);

      jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);

    }

  }

  if (cinfo->master->lossless) {

#ifdef C_LOSSLESS_SUPPORTED

    /* Prediction, sample differencing, and point transform */

    if (cinfo->data_precision == 16)

      j16init_lossless_compressor(cinfo);

    else if (cinfo->data_precision == 12)

      j12init_lossless_compressor(cinfo);

    else

      jinit_lossless_compressor(cinfo);

    /* Entropy encoding: either Huffman or arithmetic coding. */

    if (cinfo->arith_code) {

      ERREXIT(cinfo, JERR_ARITH_NOTIMPL);

    } else {

      jinit_lhuff_encoder(cinfo);

    }

    /* Need a full-image difference buffer in any multi-pass mode. */

    if (cinfo->data_precision == 16)

      j16init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||

                                                 cinfo->optimize_coding));

    else if (cinfo->data_precision == 12)

      j12init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||

                                                 cinfo->optimize_coding));

    else

      jinit_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||

                                               cinfo->optimize_coding));

#else

    ERREXIT(cinfo, JERR_NOT_COMPILED);

#endif

  } else {

    if (cinfo->data_precision == 16)

      ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

    /* Forward DCT */

    if (cinfo->data_precision == 12)

      j12init_forward_dct(cinfo);

    else

      jinit_forward_dct(cinfo);

    /* Entropy encoding: either Huffman or arithmetic coding. */

    if (cinfo->arith_code) {

#ifdef C_ARITH_CODING_SUPPORTED

      jinit_arith_encoder(cinfo);

#else

      ERREXIT(cinfo, JERR_ARITH_NOTIMPL);

#endif

    } else {

      if (cinfo->progressive_mode) {

#ifdef C_PROGRESSIVE_SUPPORTED

        jinit_phuff_encoder(cinfo);

#else

        ERREXIT(cinfo, JERR_NOT_COMPILED);

#endif

      } else

        jinit_huff_encoder(cinfo);

    }

    /* Need a full-image coefficient buffer in any multi-pass mode. */

    if (cinfo->data_precision == 12)

      j12init_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||

                                                 cinfo->optimize_coding));

    else

      jinit_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||

                                               cinfo->optimize_coding));

  }

  if (cinfo->data_precision == 16)

#ifdef C_LOSSLESS_SUPPORTED

    j16init_c_main_controller(cinfo, FALSE /* never need full buffer here */);

#else

    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

#endif

  else if (cinfo->data_precision == 12)

    j12init_c_main_controller(cinfo, FALSE /* never need full buffer here */);

  else

    jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);

  jinit_marker_writer(cinfo);

  /* We can now tell the memory manager to allocate virtual arrays. */

  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr)cinfo);

  /* Write the datastream header (SOI) immediately.

   * Frame and scan headers are postponed till later.

   * This lets application insert special markers after the SOI.

   */

  (*cinfo->marker->write_file_header) (cinfo);

}