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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 } | |
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