17dd7cddfSDavid du Colombier /*
27dd7cddfSDavid du Colombier * jcinit.c
37dd7cddfSDavid du Colombier *
4*593dc095SDavid du Colombier * Copyright (C) 1991-1997, Thomas G. Lane.
57dd7cddfSDavid du Colombier * This file is part of the Independent JPEG Group's software.
67dd7cddfSDavid du Colombier * For conditions of distribution and use, see the accompanying README file.
77dd7cddfSDavid du Colombier *
87dd7cddfSDavid du Colombier * This file contains initialization logic for the JPEG compressor.
97dd7cddfSDavid du Colombier * This routine is in charge of selecting the modules to be executed and
107dd7cddfSDavid du Colombier * making an initialization call to each one.
117dd7cddfSDavid du Colombier *
127dd7cddfSDavid du Colombier * Logically, this code belongs in jcmaster.c. It's split out because
137dd7cddfSDavid du Colombier * linking this routine implies linking the entire compression library.
147dd7cddfSDavid du Colombier * For a transcoding-only application, we want to be able to use jcmaster.c
157dd7cddfSDavid du Colombier * without linking in the whole library.
167dd7cddfSDavid du Colombier */
177dd7cddfSDavid du Colombier
187dd7cddfSDavid du Colombier #define JPEG_INTERNALS
197dd7cddfSDavid du Colombier #include "jinclude.h"
207dd7cddfSDavid du Colombier #include "jpeglib.h"
217dd7cddfSDavid du Colombier
227dd7cddfSDavid du Colombier
237dd7cddfSDavid du Colombier /*
247dd7cddfSDavid du Colombier * Master selection of compression modules.
257dd7cddfSDavid du Colombier * This is done once at the start of processing an image. We determine
267dd7cddfSDavid du Colombier * which modules will be used and give them appropriate initialization calls.
277dd7cddfSDavid du Colombier */
287dd7cddfSDavid du Colombier
297dd7cddfSDavid du Colombier GLOBAL(void)
jinit_compress_master(j_compress_ptr cinfo)307dd7cddfSDavid du Colombier jinit_compress_master (j_compress_ptr cinfo)
317dd7cddfSDavid du Colombier {
327dd7cddfSDavid du Colombier /* Initialize master control (includes parameter checking/processing) */
337dd7cddfSDavid du Colombier jinit_c_master_control(cinfo, FALSE /* full compression */);
347dd7cddfSDavid du Colombier
357dd7cddfSDavid du Colombier /* Preprocessing */
367dd7cddfSDavid du Colombier if (! cinfo->raw_data_in) {
377dd7cddfSDavid du Colombier jinit_color_converter(cinfo);
387dd7cddfSDavid du Colombier jinit_downsampler(cinfo);
397dd7cddfSDavid du Colombier jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
407dd7cddfSDavid du Colombier }
417dd7cddfSDavid du Colombier /* Forward DCT */
427dd7cddfSDavid du Colombier jinit_forward_dct(cinfo);
437dd7cddfSDavid du Colombier /* Entropy encoding: either Huffman or arithmetic coding. */
447dd7cddfSDavid du Colombier if (cinfo->arith_code) {
457dd7cddfSDavid du Colombier ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
467dd7cddfSDavid du Colombier } else {
477dd7cddfSDavid du Colombier if (cinfo->progressive_mode) {
487dd7cddfSDavid du Colombier #ifdef C_PROGRESSIVE_SUPPORTED
497dd7cddfSDavid du Colombier jinit_phuff_encoder(cinfo);
507dd7cddfSDavid du Colombier #else
517dd7cddfSDavid du Colombier ERREXIT(cinfo, JERR_NOT_COMPILED);
527dd7cddfSDavid du Colombier #endif
537dd7cddfSDavid du Colombier } else
547dd7cddfSDavid du Colombier jinit_huff_encoder(cinfo);
557dd7cddfSDavid du Colombier }
567dd7cddfSDavid du Colombier
577dd7cddfSDavid du Colombier /* Need a full-image coefficient buffer in any multi-pass mode. */
587dd7cddfSDavid du Colombier jinit_c_coef_controller(cinfo,
59*593dc095SDavid du Colombier (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
607dd7cddfSDavid du Colombier jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
617dd7cddfSDavid du Colombier
627dd7cddfSDavid du Colombier jinit_marker_writer(cinfo);
637dd7cddfSDavid du Colombier
647dd7cddfSDavid du Colombier /* We can now tell the memory manager to allocate virtual arrays. */
657dd7cddfSDavid du Colombier (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
667dd7cddfSDavid du Colombier
677dd7cddfSDavid du Colombier /* Write the datastream header (SOI) immediately.
687dd7cddfSDavid du Colombier * Frame and scan headers are postponed till later.
697dd7cddfSDavid du Colombier * This lets application insert special markers after the SOI.
707dd7cddfSDavid du Colombier */
717dd7cddfSDavid du Colombier (*cinfo->marker->write_file_header) (cinfo);
727dd7cddfSDavid du Colombier }
73