/src/libjpeg-turbo.main/jcinit.c
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1 | | /* |
2 | | * jcinit.c |
3 | | * |
4 | | * This file was part of the Independent JPEG Group's software: |
5 | | * Copyright (C) 1991-1997, Thomas G. Lane. |
6 | | * Lossless JPEG Modifications: |
7 | | * Copyright (C) 1999, Ken Murchison. |
8 | | * libjpeg-turbo Modifications: |
9 | | * Copyright (C) 2020, 2022, D. R. Commander. |
10 | | * For conditions of distribution and use, see the accompanying README.ijg |
11 | | * file. |
12 | | * |
13 | | * This file contains initialization logic for the JPEG compressor. |
14 | | * This routine is in charge of selecting the modules to be executed and |
15 | | * making an initialization call to each one. |
16 | | * |
17 | | * Logically, this code belongs in jcmaster.c. It's split out because |
18 | | * linking this routine implies linking the entire compression library. |
19 | | * For a transcoding-only application, we want to be able to use jcmaster.c |
20 | | * without linking in the whole library. |
21 | | */ |
22 | | |
23 | | #define JPEG_INTERNALS |
24 | | #include "jinclude.h" |
25 | | #include "jpeglib.h" |
26 | | #include "jpegapicomp.h" |
27 | | |
28 | | |
29 | | /* |
30 | | * Master selection of compression modules. |
31 | | * This is done once at the start of processing an image. We determine |
32 | | * which modules will be used and give them appropriate initialization calls. |
33 | | */ |
34 | | |
35 | | GLOBAL(void) |
36 | | jinit_compress_master(j_compress_ptr cinfo) |
37 | 0 | { |
38 | | /* Initialize master control (includes parameter checking/processing) */ |
39 | 0 | jinit_c_master_control(cinfo, FALSE /* full compression */); |
40 | | |
41 | | /* Preprocessing */ |
42 | 0 | if (!cinfo->raw_data_in) { |
43 | 0 | if (cinfo->data_precision == 16) { |
44 | 0 | #ifdef C_LOSSLESS_SUPPORTED |
45 | 0 | j16init_color_converter(cinfo); |
46 | 0 | j16init_downsampler(cinfo); |
47 | 0 | j16init_c_prep_controller(cinfo, |
48 | 0 | FALSE /* never need full buffer here */); |
49 | | #else |
50 | | ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); |
51 | | #endif |
52 | 0 | } else if (cinfo->data_precision == 12) { |
53 | 0 | j12init_color_converter(cinfo); |
54 | 0 | j12init_downsampler(cinfo); |
55 | 0 | j12init_c_prep_controller(cinfo, |
56 | 0 | FALSE /* never need full buffer here */); |
57 | 0 | } else { |
58 | 0 | jinit_color_converter(cinfo); |
59 | 0 | jinit_downsampler(cinfo); |
60 | 0 | jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); |
61 | 0 | } |
62 | 0 | } |
63 | |
|
64 | 0 | if (cinfo->master->lossless) { |
65 | 0 | #ifdef C_LOSSLESS_SUPPORTED |
66 | | /* Prediction, sample differencing, and point transform */ |
67 | 0 | if (cinfo->data_precision == 16) |
68 | 0 | j16init_lossless_compressor(cinfo); |
69 | 0 | else if (cinfo->data_precision == 12) |
70 | 0 | j12init_lossless_compressor(cinfo); |
71 | 0 | else |
72 | 0 | jinit_lossless_compressor(cinfo); |
73 | | /* Entropy encoding: either Huffman or arithmetic coding. */ |
74 | 0 | if (cinfo->arith_code) { |
75 | 0 | ERREXIT(cinfo, JERR_ARITH_NOTIMPL); |
76 | 0 | } else { |
77 | 0 | jinit_lhuff_encoder(cinfo); |
78 | 0 | } |
79 | | |
80 | | /* Need a full-image difference buffer in any multi-pass mode. */ |
81 | 0 | if (cinfo->data_precision == 16) |
82 | 0 | j16init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
83 | 0 | cinfo->optimize_coding)); |
84 | 0 | else if (cinfo->data_precision == 12) |
85 | 0 | j12init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
86 | 0 | cinfo->optimize_coding)); |
87 | 0 | else |
88 | 0 | jinit_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
89 | 0 | cinfo->optimize_coding)); |
90 | | #else |
91 | | ERREXIT(cinfo, JERR_NOT_COMPILED); |
92 | | #endif |
93 | 0 | } else { |
94 | 0 | if (cinfo->data_precision == 16) |
95 | 0 | ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); |
96 | | /* Forward DCT */ |
97 | 0 | if (cinfo->data_precision == 12) |
98 | 0 | j12init_forward_dct(cinfo); |
99 | 0 | else |
100 | 0 | jinit_forward_dct(cinfo); |
101 | | /* Entropy encoding: either Huffman or arithmetic coding. */ |
102 | 0 | if (cinfo->arith_code) { |
103 | 0 | #ifdef C_ARITH_CODING_SUPPORTED |
104 | 0 | jinit_arith_encoder(cinfo); |
105 | | #else |
106 | | ERREXIT(cinfo, JERR_ARITH_NOTIMPL); |
107 | | #endif |
108 | 0 | } else { |
109 | 0 | if (cinfo->progressive_mode) { |
110 | 0 | #ifdef C_PROGRESSIVE_SUPPORTED |
111 | 0 | jinit_phuff_encoder(cinfo); |
112 | | #else |
113 | | ERREXIT(cinfo, JERR_NOT_COMPILED); |
114 | | #endif |
115 | 0 | } else |
116 | 0 | jinit_huff_encoder(cinfo); |
117 | 0 | } |
118 | | |
119 | | /* Need a full-image coefficient buffer in any multi-pass mode. */ |
120 | 0 | if (cinfo->data_precision == 12) |
121 | 0 | j12init_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
122 | 0 | cinfo->optimize_coding)); |
123 | 0 | else |
124 | 0 | jinit_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
125 | 0 | cinfo->optimize_coding)); |
126 | 0 | } |
127 | |
|
128 | 0 | if (cinfo->data_precision == 16) |
129 | 0 | #ifdef C_LOSSLESS_SUPPORTED |
130 | 0 | j16init_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
131 | | #else |
132 | | ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); |
133 | | #endif |
134 | 0 | else if (cinfo->data_precision == 12) |
135 | 0 | j12init_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
136 | 0 | else |
137 | 0 | jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
138 | |
|
139 | 0 | jinit_marker_writer(cinfo); |
140 | | |
141 | | /* We can now tell the memory manager to allocate virtual arrays. */ |
142 | 0 | (*cinfo->mem->realize_virt_arrays) ((j_common_ptr)cinfo); |
143 | | |
144 | | /* Write the datastream header (SOI) immediately. |
145 | | * Frame and scan headers are postponed till later. |
146 | | * This lets application insert special markers after the SOI. |
147 | | */ |
148 | 0 | (*cinfo->marker->write_file_header) (cinfo); |
149 | 0 | } |