3rdparty/libjpeg/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)
    jinit_arith_encoder(cinfo);
  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);
}
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	jinit_arith_encoder(cinfo);
46	else {
47	jinit_huff_encoder(cinfo);
48	}
49
50	/* Need a full-image coefficient buffer in any multi-pass mode. */
51	jinit_c_coef_controller(cinfo,
52	(boolean) (cinfo->num_scans > 1 \|\| cinfo->optimize_coding));
53	jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
54
55	jinit_marker_writer(cinfo);
56
57	/* We can now tell the memory manager to allocate virtual arrays. */
58	(*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
59
60	/* Write the datastream header (SOI) immediately.
61	* Frame and scan headers are postponed till later.
62	* This lets application insert special markers after the SOI.
63	*/
64	(*cinfo->marker->write_file_header) (cinfo);
65	}