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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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