/* * 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)    jinit_arith_encoder(cinfo);  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);}