mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-11-22 04:12:09 +00:00
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
|
|
* jcinit.c
|
|
*
|
|
* Copyright (C) 1991-1995, 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 ) {
|
|
ERREXIT( cinfo, JERR_ARITH_NOTIMPL );
|
|
} 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,
|
|
( 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 );
|
|
}
|