| /* |
| * jcinit.c |
| * |
| * Copyright (C) 1991-1997, Thomas G. Lane. |
| * This file is part of the Independent JPEG Group's software. |
| * For conditions of distribution and use, see the accompanying README file. |
| * |
| * This file contains initialization logic for the JPEG compressor. |
| * This routine is in charge of selecting the modules to be executed and |
| * making an initialization call to each one. |
| * |
| * Logically, this code belongs in jcmaster.c. It's split out because |
| * linking this routine implies linking the entire compression library. |
| * For a transcoding-only application, we want to be able to use jcmaster.c |
| * without linking in the whole library. |
| */ |
| |
| #define JPEG_INTERNALS |
| #include "jinclude.h" |
| #include "jpeglib.h" |
| |
| |
| /* |
| * Master selection of compression modules. |
| * This is done once at the start of processing an image. We determine |
| * which modules will be used and give them appropriate initialization calls. |
| */ |
| |
| GLOBAL(void) |
| jinit_compress_master (j_compress_ptr cinfo) |
| { |
| /* Initialize master control (includes parameter checking/processing) */ |
| jinit_c_master_control(cinfo, FALSE /* full compression */); |
| |
| /* Preprocessing */ |
| if (! cinfo->raw_data_in) { |
| jinit_color_converter(cinfo); |
| jinit_downsampler(cinfo); |
| jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); |
| } |
| /* Forward DCT */ |
| jinit_forward_dct(cinfo); |
| /* Entropy encoding: either Huffman or arithmetic coding. */ |
| if (cinfo->arith_code) { |
| #ifdef C_ARITH_CODING_SUPPORTED |
| jinit_arith_encoder(cinfo); |
| #else |
| ERREXIT(cinfo, JERR_ARITH_NOTIMPL); |
| #endif |
| } else { |
| if (cinfo->progressive_mode) { |
| #ifdef C_PROGRESSIVE_SUPPORTED |
| jinit_phuff_encoder(cinfo); |
| #else |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| #endif |
| } else |
| jinit_huff_encoder(cinfo); |
| } |
| |
| /* Need a full-image coefficient buffer in any multi-pass mode. */ |
| jinit_c_coef_controller(cinfo, |
| (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding)); |
| jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
| |
| jinit_marker_writer(cinfo); |
| |
| /* We can now tell the memory manager to allocate virtual arrays. */ |
| (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); |
| |
| /* Write the datastream header (SOI) immediately. |
| * Frame and scan headers are postponed till later. |
| * This lets application insert special markers after the SOI. |
| */ |
| (*cinfo->marker->write_file_header) (cinfo); |
| } |