michael@0: /*
michael@0:  * jcinit.c
michael@0:  *
michael@0:  * Copyright (C) 1991-1997, Thomas G. Lane.
michael@0:  * This file is part of the Independent JPEG Group's software.
michael@0:  * For conditions of distribution and use, see the accompanying README file.
michael@0:  *
michael@0:  * This file contains initialization logic for the JPEG compressor.
michael@0:  * This routine is in charge of selecting the modules to be executed and
michael@0:  * making an initialization call to each one.
michael@0:  *
michael@0:  * Logically, this code belongs in jcmaster.c.  It's split out because
michael@0:  * linking this routine implies linking the entire compression library.
michael@0:  * For a transcoding-only application, we want to be able to use jcmaster.c
michael@0:  * without linking in the whole library.
michael@0:  */
michael@0: 
michael@0: #define JPEG_INTERNALS
michael@0: #include "jinclude.h"
michael@0: #include "jpeglib.h"
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Master selection of compression modules.
michael@0:  * This is done once at the start of processing an image.  We determine
michael@0:  * which modules will be used and give them appropriate initialization calls.
michael@0:  */
michael@0: 
michael@0: GLOBAL(void)
michael@0: jinit_compress_master (j_compress_ptr cinfo)
michael@0: {
michael@0:   /* Initialize master control (includes parameter checking/processing) */
michael@0:   jinit_c_master_control(cinfo, FALSE /* full compression */);
michael@0: 
michael@0:   /* Preprocessing */
michael@0:   if (! cinfo->raw_data_in) {
michael@0:     jinit_color_converter(cinfo);
michael@0:     jinit_downsampler(cinfo);
michael@0:     jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
michael@0:   }
michael@0:   /* Forward DCT */
michael@0:   jinit_forward_dct(cinfo);
michael@0:   /* Entropy encoding: either Huffman or arithmetic coding. */
michael@0:   if (cinfo->arith_code) {
michael@0: #ifdef C_ARITH_CODING_SUPPORTED
michael@0:     jinit_arith_encoder(cinfo);
michael@0: #else
michael@0:     ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
michael@0: #endif
michael@0:   } else {
michael@0:     if (cinfo->progressive_mode) {
michael@0: #ifdef C_PROGRESSIVE_SUPPORTED
michael@0:       jinit_phuff_encoder(cinfo);
michael@0: #else
michael@0:       ERREXIT(cinfo, JERR_NOT_COMPILED);
michael@0: #endif
michael@0:     } else
michael@0:       jinit_huff_encoder(cinfo);
michael@0:   }
michael@0: 
michael@0:   /* Need a full-image coefficient buffer in any multi-pass mode. */
michael@0:   jinit_c_coef_controller(cinfo,
michael@0: 		(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
michael@0:   jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
michael@0: 
michael@0:   jinit_marker_writer(cinfo);
michael@0: 
michael@0:   /* We can now tell the memory manager to allocate virtual arrays. */
michael@0:   (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
michael@0: 
michael@0:   /* Write the datastream header (SOI) immediately.
michael@0:    * Frame and scan headers are postponed till later.
michael@0:    * This lets application insert special markers after the SOI.
michael@0:    */
michael@0:   (*cinfo->marker->write_file_header) (cinfo);
michael@0: }