/src/mozilla-central/media/libjpeg/jcinit.c
Line | Count | Source (jump to first uncovered line) |
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.ijg |
7 | | * file. |
8 | | * |
9 | | * This file contains initialization logic for the JPEG compressor. |
10 | | * This routine is in charge of selecting the modules to be executed and |
11 | | * making an initialization call to each one. |
12 | | * |
13 | | * Logically, this code belongs in jcmaster.c. It's split out because |
14 | | * linking this routine implies linking the entire compression library. |
15 | | * For a transcoding-only application, we want to be able to use jcmaster.c |
16 | | * without linking in the whole library. |
17 | | */ |
18 | | |
19 | | #define JPEG_INTERNALS |
20 | | #include "jinclude.h" |
21 | | #include "jpeglib.h" |
22 | | |
23 | | |
24 | | /* |
25 | | * Master selection of compression modules. |
26 | | * This is done once at the start of processing an image. We determine |
27 | | * which modules will be used and give them appropriate initialization calls. |
28 | | */ |
29 | | |
30 | | GLOBAL(void) |
31 | | jinit_compress_master (j_compress_ptr cinfo) |
32 | 0 | { |
33 | 0 | /* Initialize master control (includes parameter checking/processing) */ |
34 | 0 | jinit_c_master_control(cinfo, FALSE /* full compression */); |
35 | 0 |
|
36 | 0 | /* Preprocessing */ |
37 | 0 | if (! cinfo->raw_data_in) { |
38 | 0 | jinit_color_converter(cinfo); |
39 | 0 | jinit_downsampler(cinfo); |
40 | 0 | jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); |
41 | 0 | } |
42 | 0 | /* Forward DCT */ |
43 | 0 | jinit_forward_dct(cinfo); |
44 | 0 | /* Entropy encoding: either Huffman or arithmetic coding. */ |
45 | 0 | if (cinfo->arith_code) { |
46 | | #ifdef C_ARITH_CODING_SUPPORTED |
47 | | jinit_arith_encoder(cinfo); |
48 | | #else |
49 | 0 | ERREXIT(cinfo, JERR_ARITH_NOTIMPL); |
50 | 0 | #endif |
51 | 0 | } else { |
52 | 0 | if (cinfo->progressive_mode) { |
53 | 0 | #ifdef C_PROGRESSIVE_SUPPORTED |
54 | 0 | jinit_phuff_encoder(cinfo); |
55 | | #else |
56 | | ERREXIT(cinfo, JERR_NOT_COMPILED); |
57 | | #endif |
58 | | } else |
59 | 0 | jinit_huff_encoder(cinfo); |
60 | 0 | } |
61 | 0 |
|
62 | 0 | /* Need a full-image coefficient buffer in any multi-pass mode. */ |
63 | 0 | jinit_c_coef_controller(cinfo, |
64 | 0 | (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding)); |
65 | 0 | jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
66 | 0 |
|
67 | 0 | jinit_marker_writer(cinfo); |
68 | 0 |
|
69 | 0 | /* We can now tell the memory manager to allocate virtual arrays. */ |
70 | 0 | (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); |
71 | 0 |
|
72 | 0 | /* Write the datastream header (SOI) immediately. |
73 | 0 | * Frame and scan headers are postponed till later. |
74 | 0 | * This lets application insert special markers after the SOI. |
75 | 0 | */ |
76 | 0 | (*cinfo->marker->write_file_header) (cinfo); |
77 | 0 | } |