nuclear@26: /*
nuclear@26:  * jcinit.c
nuclear@26:  *
nuclear@26:  * Copyright (C) 1991-1997, Thomas G. Lane.
nuclear@26:  * This file is part of the Independent JPEG Group's software.
nuclear@26:  * For conditions of distribution and use, see the accompanying README file.
nuclear@26:  *
nuclear@26:  * This file contains initialization logic for the JPEG compressor.
nuclear@26:  * This routine is in charge of selecting the modules to be executed and
nuclear@26:  * making an initialization call to each one.
nuclear@26:  *
nuclear@26:  * Logically, this code belongs in jcmaster.c.  It's split out because
nuclear@26:  * linking this routine implies linking the entire compression library.
nuclear@26:  * For a transcoding-only application, we want to be able to use jcmaster.c
nuclear@26:  * without linking in the whole library.
nuclear@26:  */
nuclear@26: 
nuclear@26: #define JPEG_INTERNALS
nuclear@26: #include "jinclude.h"
nuclear@26: #include "jpeglib.h"
nuclear@26: 
nuclear@26: 
nuclear@26: /*
nuclear@26:  * Master selection of compression modules.
nuclear@26:  * This is done once at the start of processing an image.  We determine
nuclear@26:  * which modules will be used and give them appropriate initialization calls.
nuclear@26:  */
nuclear@26: 
nuclear@26: GLOBAL(void)
nuclear@26: jinit_compress_master (j_compress_ptr cinfo)
nuclear@26: {
nuclear@26:   /* Initialize master control (includes parameter checking/processing) */
nuclear@26:   jinit_c_master_control(cinfo, FALSE /* full compression */);
nuclear@26: 
nuclear@26:   /* Preprocessing */
nuclear@26:   if (! cinfo->raw_data_in) {
nuclear@26:     jinit_color_converter(cinfo);
nuclear@26:     jinit_downsampler(cinfo);
nuclear@26:     jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
nuclear@26:   }
nuclear@26:   /* Forward DCT */
nuclear@26:   jinit_forward_dct(cinfo);
nuclear@26:   /* Entropy encoding: either Huffman or arithmetic coding. */
nuclear@26:   if (cinfo->arith_code) {
nuclear@26:     ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
nuclear@26:   } else {
nuclear@26:     if (cinfo->progressive_mode) {
nuclear@26: #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@26:       jinit_phuff_encoder(cinfo);
nuclear@26: #else
nuclear@26:       ERREXIT(cinfo, JERR_NOT_COMPILED);
nuclear@26: #endif
nuclear@26:     } else
nuclear@26:       jinit_huff_encoder(cinfo);
nuclear@26:   }
nuclear@26: 
nuclear@26:   /* Need a full-image coefficient buffer in any multi-pass mode. */
nuclear@26:   jinit_c_coef_controller(cinfo,
nuclear@26: 		(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
nuclear@26:   jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
nuclear@26: 
nuclear@26:   jinit_marker_writer(cinfo);
nuclear@26: 
nuclear@26:   /* We can now tell the memory manager to allocate virtual arrays. */
nuclear@26:   (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
nuclear@26: 
nuclear@26:   /* Write the datastream header (SOI) immediately.
nuclear@26:    * Frame and scan headers are postponed till later.
nuclear@26:    * This lets application insert special markers after the SOI.
nuclear@26:    */
nuclear@26:   (*cinfo->marker->write_file_header) (cinfo);
nuclear@26: }