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/*
* jlossls.h
*
* 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 include file contains common declarations for the lossless JPEG
* codec modules.
*/
#ifndef JLOSSLS_H
#define JLOSSLS_H
/*
* Table H.1: Predictors for lossless coding.
*/
#define PREDICTOR1 Ra
#define PREDICTOR2 Rb
#define PREDICTOR3 Rc
#define PREDICTOR4 (int) ((INT32) Ra + (INT32) Rb - (INT32) Rc)
#define PREDICTOR5 (int) ((INT32) Ra + RIGHT_SHIFT((INT32) Rb - (INT32) Rc, 1))
#define PREDICTOR6 (int) ((INT32) Rb + RIGHT_SHIFT((INT32) Ra - (INT32) Rc, 1))
#define PREDICTOR6_BUG (int) ((INT16) Rb + RIGHT_SHIFT((INT16) Ra - (INT16) Rc, 1))
#define PREDICTOR7 (int) RIGHT_SHIFT((INT32) Ra + (INT32) Rb, 1)
typedef JMETHOD(void, predict_difference_method_ptr,
(j_compress_ptr cinfo, int ci,
JSAMPROW input_buf, JSAMPROW prev_row,
JDIFFROW diff_buf, JDIMENSION width));
typedef JMETHOD(void, scaler_method_ptr,
(j_compress_ptr cinfo, int ci,
JSAMPROW input_buf, JSAMPROW output_buf,
JDIMENSION width));
/* Lossless-specific compression codec (compressor proper) */
typedef struct {
struct jpeg_c_codec pub; /* public fields */
/* Difference buffer control */
JMETHOD(void, diff_start_pass, (j_compress_ptr cinfo,
J_BUF_MODE pass_mode));
/* Pointer to data which is private to diff controller */
void *diff_private;
/* Entropy encoding */
JMETHOD(JDIMENSION, entropy_encode_mcus, (j_compress_ptr cinfo,
JDIFFIMAGE diff_buf,
JDIMENSION MCU_row_num,
JDIMENSION MCU_col_num,
JDIMENSION nMCU));
/* Pointer to data which is private to entropy module */
void *entropy_private;
/* Prediction, differencing */
JMETHOD(void, predict_start_pass, (j_compress_ptr cinfo));
/* It is useful to allow each component to have a separate diff method. */
predict_difference_method_ptr predict_difference[MAX_COMPONENTS];
/* Pointer to data which is private to predictor module */
void *pred_private;
/* Sample scaling */
JMETHOD(void, scaler_start_pass, (j_compress_ptr cinfo));
JMETHOD(void, scaler_scale, (j_compress_ptr cinfo,
JSAMPROW input_buf, JSAMPROW output_buf,
JDIMENSION width));
/* Pointer to data which is private to scaler module */
void *scaler_private;
} jpeg_lossless_c_codec;
typedef jpeg_lossless_c_codec * j_lossless_c_ptr;
typedef JMETHOD(void, predict_undifference_method_ptr,
(j_decompress_ptr cinfo, int comp_index,
JDIFFROW diff_buf, JDIFFROW prev_row,
JDIFFROW undiff_buf, JDIMENSION width));
/* Lossless-specific decompression codec (decompressor proper) */
typedef struct {
struct jpeg_d_codec pub; /* public fields */
/* Difference buffer control */
JMETHOD(void, diff_start_input_pass, (j_decompress_ptr cinfo));
/* Pointer to data which is private to diff controller */
void *diff_private;
/* Entropy decoding */
JMETHOD(void, entropy_start_pass, (j_decompress_ptr cinfo));
JMETHOD(boolean, entropy_process_restart, (j_decompress_ptr cinfo));
JMETHOD(JDIMENSION, entropy_decode_mcus, (j_decompress_ptr cinfo,
JDIFFIMAGE diff_buf,
JDIMENSION MCU_row_num,
JDIMENSION MCU_col_num,
JDIMENSION nMCU));
/* Pointer to data which is private to entropy module */
void *entropy_private;
/* Prediction, undifferencing */
JMETHOD(void, predict_start_pass, (j_decompress_ptr cinfo));
JMETHOD(void, predict_process_restart, (j_decompress_ptr cinfo));
/* It is useful to allow each component to have a separate undiff method. */
predict_undifference_method_ptr predict_undifference[MAX_COMPONENTS];
/* Pointer to data which is private to predictor module */
void *pred_private;
/* Sample scaling */
JMETHOD(void, scaler_start_pass, (j_decompress_ptr cinfo));
JMETHOD(void, scaler_scale, (j_decompress_ptr cinfo,
JDIFFROW diff_buf, JSAMPROW output_buf,
JDIMENSION width));
/* Pointer to data which is private to scaler module */
void *scaler_private;
} jpeg_lossless_d_codec;
typedef jpeg_lossless_d_codec * j_lossless_d_ptr;
/* Compression module initialization routines */
EXTERN(void) jinit_lossless_c_codec JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_lhuff_encoder JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_differencer JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_c_scaler JPP((j_compress_ptr cinfo));
/* Decompression module initialization routines */
EXTERN(void) jinit_lossless_d_codec JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_lhuff_decoder JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_undifferencer JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_d_scaler JPP((j_decompress_ptr cinfo));
#endif /* JLOSSLS_H */
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