1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* jclossy.c
*
* Copyright (C) 1998, 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 the control logic for the lossy JPEG compressor.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jlossy.h"
/*
* Initialize for a processing pass.
*/
METHODDEF(void)
start_pass (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
{
j_lossy_c_ptr lossyc = (j_lossy_c_ptr) cinfo->codec;
(*lossyc->fdct_start_pass) (cinfo);
(*lossyc->coef_start_pass) (cinfo, pass_mode);
}
/*
* Initialize the lossy compression codec.
* This is called only once, during master selection.
*/
GLOBAL(void)
jinit_lossy_c_codec (j_compress_ptr cinfo)
{
j_lossy_c_ptr lossyc;
/* Create subobject in permanent pool */
lossyc = (j_lossy_c_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
SIZEOF(jpeg_lossy_c_codec));
cinfo->codec = (struct jpeg_c_codec *) lossyc;
/* Initialize sub-modules */
/* Forward DCT */
jinit_forward_dct(cinfo);
/* Entropy encoding: either Huffman or arithmetic coding. */
if (cinfo->arith_code) {
#ifdef WITH_ARITHMETIC_PATCH
jinit_arith_encoder(cinfo);
#else
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
#endif
} else {
if (cinfo->process == JPROC_PROGRESSIVE) {
#ifdef C_PROGRESSIVE_SUPPORTED
jinit_phuff_encoder(cinfo);
#else
ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
} else
jinit_shuff_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));
/* Initialize method pointers.
*
* Note: entropy_start_pass and entropy_finish_pass are assigned in
* jcshuff.c or jcphuff.c and compress_data is assigned in jccoefct.c.
*/
lossyc->pub.start_pass = start_pass;
}
|
