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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
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/*
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* jcinit.c
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*
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* Copyright (C) 1991-1995, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains initialization logic for the JPEG compressor.
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* This routine is in charge of selecting the modules to be executed and
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* making an initialization call to each one.
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*
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* Logically, this code belongs in jcmaster.c. It's split out because
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* linking this routine implies linking the entire compression library.
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* For a transcoding-only application, we want to be able to use jcmaster.c
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* without linking in the whole library.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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/*
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* Master selection of compression modules.
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* This is done once at the start of processing an image. We determine
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* which modules will be used and give them appropriate initialization calls.
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*/
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GLOBAL void
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jinit_compress_master( j_compress_ptr cinfo ) {
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/* Initialize master control (includes parameter checking/processing) */
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jinit_c_master_control( cinfo, FALSE /* full compression */ );
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/* Preprocessing */
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if ( !cinfo->raw_data_in ) {
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jinit_color_converter( cinfo );
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jinit_downsampler( cinfo );
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jinit_c_prep_controller( cinfo, FALSE /* never need full buffer here */ );
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}
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/* Forward DCT */
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jinit_forward_dct( cinfo );
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/* Entropy encoding: either Huffman or arithmetic coding. */
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if ( cinfo->arith_code ) {
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ERREXIT( cinfo, JERR_ARITH_NOTIMPL );
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} else {
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if ( cinfo->progressive_mode ) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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jinit_phuff_encoder( cinfo );
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#else
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ERREXIT( cinfo, JERR_NOT_COMPILED );
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#endif
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} else {
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jinit_huff_encoder( cinfo );
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}
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}
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/* Need a full-image coefficient buffer in any multi-pass mode. */
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jinit_c_coef_controller( cinfo,
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( cinfo->num_scans > 1 || cinfo->optimize_coding ) );
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jinit_c_main_controller( cinfo, FALSE /* never need full buffer here */ );
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jinit_marker_writer( cinfo );
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/* We can now tell the memory manager to allocate virtual arrays. */
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( *cinfo->mem->realize_virt_arrays )( (j_common_ptr) cinfo );
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/* Write the datastream header (SOI) immediately.
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* Frame and scan headers are postponed till later.
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* This lets application insert special markers after the SOI.
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*/
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( *cinfo->marker->write_file_header )( cinfo );
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}
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