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/*
* jlossy.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 lossy (DCT-based)
* JPEG codec modules.
*/
#ifndef JLOSSY_H
#define JLOSSY_H
/* Lossy-specific compression codec (compressor proper) */
typedef struct {
struct jpeg_c_codec pub; /* public fields */
/* Coefficient buffer control */
JMETHOD(void, coef_start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode));
/* JMETHOD(boolean, coef_compress_data, (j_compress_ptr cinfo,
JSAMPIMAGE input_buf));*/
/* Pointer to data which is private to coef module */
void *coef_private;
/* Forward DCT (also controls coefficient quantization) */
JMETHOD(void, fdct_start_pass, (j_compress_ptr cinfo));
/* perhaps this should be an array??? */
JMETHOD(void, fdct_forward_DCT, (j_compress_ptr cinfo,
jpeg_component_info * compptr,
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
JDIMENSION start_row, JDIMENSION start_col,
JDIMENSION num_blocks));
/* Pointer to data which is private to fdct module */
void *fdct_private;
/* Entropy encoding */
JMETHOD(boolean, entropy_encode_mcu, (j_compress_ptr cinfo,
JBLOCKROW *MCU_data));
/* Pointer to data which is private to entropy module */
void *entropy_private;
} jpeg_lossy_c_codec;
typedef jpeg_lossy_c_codec * j_lossy_c_ptr;
typedef JMETHOD(void, inverse_DCT_method_ptr,
(j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col));
/* Lossy-specific decompression codec (decompressor proper) */
typedef struct {
struct jpeg_d_codec pub; /* public fields */
/* Coefficient buffer control */
JMETHOD(void, coef_start_input_pass, (j_decompress_ptr cinfo));
JMETHOD(void, coef_start_output_pass, (j_decompress_ptr cinfo));
/* Pointer to array of coefficient virtual arrays, or NULL if none */
jvirt_barray_ptr *coef_arrays;
/* Pointer to data which is private to coef module */
void *coef_private;
/* Entropy decoding */
JMETHOD(void, entropy_start_pass, (j_decompress_ptr cinfo));
JMETHOD(boolean, entropy_decode_mcu, (j_decompress_ptr cinfo,
JBLOCKROW *MCU_data));
/* This is here to share code between baseline and progressive decoders; */
/* other modules probably should not use it */
boolean entropy_insufficient_data; /* set TRUE after emitting warning */
/* Pointer to data which is private to entropy module */
void *entropy_private;
/* Inverse DCT (also performs dequantization) */
JMETHOD(void, idct_start_pass, (j_decompress_ptr cinfo));
/* It is useful to allow each component to have a separate IDCT method. */
inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
/* Pointer to data which is private to idct module */
void *idct_private;
} jpeg_lossy_d_codec;
typedef jpeg_lossy_d_codec * j_lossy_d_ptr;
/* Compression module initialization routines */
EXTERN(void) jinit_lossy_c_codec JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo,
boolean need_full_buffer));
EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_shuff_encoder JPP((j_compress_ptr cinfo));
EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo));
/* Decompression module initialization routines */
EXTERN(void) jinit_lossy_d_codec JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo,
boolean need_full_buffer));
EXTERN(void) jinit_shuff_decoder JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo));
EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo));
#endif /* JLOSSY_H */
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