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/*
* jclossls.c
*
* Copyright (C) 1998, 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 the control logic for the lossless JPEG compressor.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jlossls.h"
#ifdef C_LOSSLESS_SUPPORTED
/*
* Initialize for a processing pass.
*/
METHODDEF(void)
start_pass (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
{
j_lossless_c_ptr losslsc = (j_lossless_c_ptr) cinfo->codec;
(*losslsc->scaler_start_pass) (cinfo);
(*losslsc->predict_start_pass) (cinfo);
(*losslsc->diff_start_pass) (cinfo, pass_mode);
}
/*
* Initialize the lossless compression codec.
* This is called only once, during master selection.
*/
GLOBAL(void)
jinit_lossless_c_codec(j_compress_ptr cinfo)
{
j_lossless_c_ptr losslsc;
/* Create subobject in permanent pool */
losslsc = (j_lossless_c_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
SIZEOF(jpeg_lossless_c_codec));
cinfo->codec = (struct jpeg_c_codec *) losslsc;
/* Initialize sub-modules */
/* Scaler */
jinit_c_scaler(cinfo);
/* Differencer */
jinit_differencer(cinfo);
/* Entropy encoding: either Huffman or arithmetic coding. */
if (cinfo->arith_code) {
#ifdef WITH_ARITHMETIC_PATCH
jinit_arith_encoder(cinfo);
#else
ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
#endif
} else {
jinit_lhuff_encoder(cinfo);
}
/* Need a full-image difference buffer in any multi-pass mode. */
jinit_c_diff_controller(cinfo,
(boolean) (cinfo->num_scans > 1 ||
cinfo->optimize_coding));
/* Initialize method pointers.
*
* Note: entropy_start_pass and entropy_finish_pass are assigned in
* jclhuff.c and compress_data is assigned in jcdiffct.c.
*/
losslsc->pub.start_pass = start_pass;
}
#endif /* C_LOSSLESS_SUPPORTED */
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