src/jpeg/jcinit.c

/*
 * jcinit.c
 *
 * Copyright (C) 1991-1997, 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 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"


/*
 * 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) {
    jinit_color_converter(cinfo);
    jinit_downsampler(cinfo);
    jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
  }
  /* Forward DCT */
  jinit_forward_dct(cinfo);
  /* Entropy encoding: either Huffman or arithmetic coding. */
  if (cinfo->arith_code) {
    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
  } 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. */
  jinit_c_coef_controller(cinfo,
		(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
  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);
}
Commit	Line	Data
	1	/*
	2	* jcinit.c
	3	*
	4	* Copyright (C) 1991-1997, 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 initialization logic for the JPEG compressor.
	9	* This routine is in charge of selecting the modules to be executed and
	10	* making an initialization call to each one.
	11	*
	12	* Logically, this code belongs in jcmaster.c. It's split out because
	13	* linking this routine implies linking the entire compression library.
	14	* For a transcoding-only application, we want to be able to use jcmaster.c
	15	* without linking in the whole library.
	16	*/
	17
	18	#define JPEG_INTERNALS
	19	#include "jinclude.h"
	20	#include "jpeglib.h"
	21
	22
	23	/*
	24	* Master selection of compression modules.
	25	* This is done once at the start of processing an image. We determine
	26	* which modules will be used and give them appropriate initialization calls.
	27	*/
	28
	29	GLOBAL(void)
	30	jinit_compress_master (j_compress_ptr cinfo)
	31	{
	32	/* Initialize master control (includes parameter checking/processing) */
	33	jinit_c_master_control(cinfo, FALSE /* full compression */);
	34
	35	/* Preprocessing */
	36	if (! cinfo->raw_data_in) {
	37	jinit_color_converter(cinfo);
	38	jinit_downsampler(cinfo);
	39	jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
	40	}
	41	/* Forward DCT */
	42	jinit_forward_dct(cinfo);
	43	/* Entropy encoding: either Huffman or arithmetic coding. */
	44	if (cinfo->arith_code) {
	45	ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
	46	} else {
	47	if (cinfo->progressive_mode) {
	48	#ifdef C_PROGRESSIVE_SUPPORTED
	49	jinit_phuff_encoder(cinfo);
	50	#else
	51	ERREXIT(cinfo, JERR_NOT_COMPILED);
	52	#endif
	53	} else
	54	jinit_huff_encoder(cinfo);
	55	}
	56
	57	/* Need a full-image coefficient buffer in any multi-pass mode. */
	58	jinit_c_coef_controller(cinfo,
	59	(boolean) (cinfo->num_scans > 1 \|\| cinfo->optimize_coding));
	60	jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
	61
	62	jinit_marker_writer(cinfo);
	63
	64	/* We can now tell the memory manager to allocate virtual arrays. */
	65	(*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
	66
	67	/* Write the datastream header (SOI) immediately.
	68	* Frame and scan headers are postponed till later.
	69	* This lets application insert special markers after the SOI.
	70	*/
	71	(*cinfo->marker->write_file_header) (cinfo);
	72	}