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/*
* jlossls.h
*
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1998, Thomas G. Lane.
* Lossless JPEG Modifications:
* Copyright (C) 1999, Ken Murchison.
* libjpeg-turbo Modifications:
* Copyright (C) 2022, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
* This include file contains common declarations for the lossless JPEG
* codec modules.
*/
#ifndef JLOSSLS_H
#define JLOSSLS_H
#if defined(C_LOSSLESS_SUPPORTED) || defined(D_LOSSLESS_SUPPORTED)
#define JPEG_INTERNALS
#include "jpeglib.h"
#include "jsamplecomp.h"
#define ALLOC_DARRAY(pool_id, diffsperrow, numrows) \
(JDIFFARRAY)(*cinfo->mem->alloc_sarray) \
((j_common_ptr)cinfo, pool_id, \
(diffsperrow) * sizeof(JDIFF) / sizeof(_JSAMPLE), numrows)
/*
* Table H.1: Predictors for lossless coding.
*/
#define PREDICTOR1 Ra
#define PREDICTOR2 Rb
#define PREDICTOR3 Rc
#define PREDICTOR4 (int)((JLONG)Ra + (JLONG)Rb - (JLONG)Rc)
#define PREDICTOR5 (int)((JLONG)Ra + RIGHT_SHIFT((JLONG)Rb - (JLONG)Rc, 1))
#define PREDICTOR6 (int)((JLONG)Rb + RIGHT_SHIFT((JLONG)Ra - (JLONG)Rc, 1))
#define PREDICTOR7 (int)RIGHT_SHIFT((JLONG)Ra + (JLONG)Rb, 1)
#endif
#ifdef C_LOSSLESS_SUPPORTED
typedef void (*predict_difference_method_ptr) (j_compress_ptr cinfo, int ci,
_JSAMPROW input_buf,
_JSAMPROW prev_row,
JDIFFROW diff_buf,
JDIMENSION width);
/* Lossless compressor */
typedef struct {
struct jpeg_forward_dct pub; /* public fields */
/* It is useful to allow each component to have a separate diff method. */
predict_difference_method_ptr predict_difference[MAX_COMPONENTS];
/* MCU rows left in the restart interval for each component */
unsigned int restart_rows_to_go[MAX_COMPONENTS];
/* Sample scaling */
void (*scaler_scale) (j_compress_ptr cinfo, _JSAMPROW input_buf,
_JSAMPROW output_buf, JDIMENSION width);
} jpeg_lossless_compressor;
typedef jpeg_lossless_compressor *lossless_comp_ptr;
#endif /* C_LOSSLESS_SUPPORTED */
#ifdef D_LOSSLESS_SUPPORTED
typedef void (*predict_undifference_method_ptr) (j_decompress_ptr cinfo,
int comp_index,
JDIFFROW diff_buf,
JDIFFROW prev_row,
JDIFFROW undiff_buf,
JDIMENSION width);
/* Lossless decompressor */
typedef struct {
struct jpeg_inverse_dct pub; /* public fields */
/* It is useful to allow each component to have a separate undiff method. */
predict_undifference_method_ptr predict_undifference[MAX_COMPONENTS];
/* Sample scaling */
void (*scaler_scale) (j_decompress_ptr cinfo, JDIFFROW diff_buf,
_JSAMPROW output_buf, JDIMENSION width);
} jpeg_lossless_decompressor;
typedef jpeg_lossless_decompressor *lossless_decomp_ptr;
#endif /* D_LOSSLESS_SUPPORTED */
#endif /* JLOSSLS_H */
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