/src/libjpeg-turbo.2.1.x/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 | | * libjpeg-turbo Modifications: |
7 | | * Copyright (C) 2020, D. R. Commander. |
8 | | * For conditions of distribution and use, see the accompanying README.ijg |
9 | | * file. |
10 | | * |
11 | | * This file contains initialization logic for the JPEG compressor. |
12 | | * This routine is in charge of selecting the modules to be executed and |
13 | | * making an initialization call to each one. |
14 | | * |
15 | | * Logically, this code belongs in jcmaster.c. It's split out because |
16 | | * linking this routine implies linking the entire compression library. |
17 | | * For a transcoding-only application, we want to be able to use jcmaster.c |
18 | | * without linking in the whole library. |
19 | | */ |
20 | | |
21 | | #define JPEG_INTERNALS |
22 | | #include "jinclude.h" |
23 | | #include "jpeglib.h" |
24 | | #include "jpegcomp.h" |
25 | | |
26 | | |
27 | | /* |
28 | | * Master selection of compression modules. |
29 | | * This is done once at the start of processing an image. We determine |
30 | | * which modules will be used and give them appropriate initialization calls. |
31 | | */ |
32 | | |
33 | | GLOBAL(void) |
34 | | jinit_compress_master(j_compress_ptr cinfo) |
35 | 6.62k | { |
36 | | /* Initialize master control (includes parameter checking/processing) */ |
37 | 6.62k | jinit_c_master_control(cinfo, FALSE /* full compression */); |
38 | | |
39 | | /* Preprocessing */ |
40 | 6.62k | if (!cinfo->raw_data_in) { |
41 | 6.57k | jinit_color_converter(cinfo); |
42 | 6.57k | jinit_downsampler(cinfo); |
43 | 6.57k | jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); |
44 | 6.57k | } |
45 | | /* Forward DCT */ |
46 | 6.62k | jinit_forward_dct(cinfo); |
47 | | /* Entropy encoding: either Huffman or arithmetic coding. */ |
48 | 6.62k | if (cinfo->arith_code) { |
49 | 0 | #ifdef C_ARITH_CODING_SUPPORTED |
50 | 0 | jinit_arith_encoder(cinfo); |
51 | | #else |
52 | | ERREXIT(cinfo, JERR_ARITH_NOTIMPL); |
53 | | #endif |
54 | 6.62k | } else { |
55 | 6.62k | if (cinfo->progressive_mode) { |
56 | 965 | #ifdef C_PROGRESSIVE_SUPPORTED |
57 | 965 | jinit_phuff_encoder(cinfo); |
58 | | #else |
59 | | ERREXIT(cinfo, JERR_NOT_COMPILED); |
60 | | #endif |
61 | 965 | } else |
62 | 5.65k | jinit_huff_encoder(cinfo); |
63 | 6.62k | } |
64 | | |
65 | | /* Need a full-image coefficient buffer in any multi-pass mode. */ |
66 | 6.62k | jinit_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 || |
67 | 6.62k | cinfo->optimize_coding)); |
68 | 6.62k | jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
69 | | |
70 | 6.62k | jinit_marker_writer(cinfo); |
71 | | |
72 | | /* We can now tell the memory manager to allocate virtual arrays. */ |
73 | 6.62k | (*cinfo->mem->realize_virt_arrays) ((j_common_ptr)cinfo); |
74 | | |
75 | | /* Write the datastream header (SOI) immediately. |
76 | | * Frame and scan headers are postponed till later. |
77 | | * This lets application insert special markers after the SOI. |
78 | | */ |
79 | 6.62k | (*cinfo->marker->write_file_header) (cinfo); |
80 | 6.62k | } |