projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| e1929140 RR |
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 | } |