jdhuff.cpp File Reference

#include "jinclude.h"
#include "mrpt_jpeglib.h"
#include "jdhuff.h"

Go to the source code of this file.

Classes
struct	savable_state
struct	huff_entropy_decoder

Macros
#define	JPEG_INTERNALS
#define	ASSIGN_STATE(dest, src)   ((dest) = (src))
#define	MIN_GET_BITS   (BIT_BUF_SIZE - 7)
#define	HUFF_EXTEND(x, s)   ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))

Typedefs
typedef huff_entropy_decoder *	huff_entropy_ptr

Functions
	start_pass_huff_decoder (j_decompress_ptr cinfo)
	jpeg_make_d_derived_tbl (j_decompress_ptr cinfo, boolean isDC, int tblno, d_derived_tbl **pdtbl)
	jpeg_fill_bit_buffer (bitread_working_state *state, bit_buf_type get_buffer, int bits_left, int nbits)
	jpeg_huff_decode (bitread_working_state *state, bit_buf_type get_buffer, int bits_left, d_derived_tbl *htbl, int min_bits)
	process_restart (j_decompress_ptr cinfo)
	decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	jinit_huff_decoder (j_decompress_ptr cinfo)

Variables
static const int	extend_test [16]
static const int	extend_offset [16]

Macro Definition Documentation

ASSIGN_STATE

#define ASSIGN_STATE	(		dest,
			src
	)		((dest) = (src))

Definition at line 33 of file jdhuff.cpp.

Referenced by decode_mcu().

HUFF_EXTEND

#define HUFF_EXTEND	(		x,
			s
	)		((x) < extend_test[s] ? (x) + extend_offset[s] : (x))

Definition at line 476 of file jdhuff.cpp.

Referenced by decode_mcu().

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 10 of file jdhuff.cpp.

MIN_GET_BITS

#define MIN_GET_BITS   (BIT_BUF_SIZE - 7)

Definition at line 295 of file jdhuff.cpp.

Referenced by jpeg_fill_bit_buffer().

Typedef Documentation

huff_entropy_ptr

typedef huff_entropy_decoder* huff_entropy_ptr

Definition at line 71 of file jdhuff.cpp.

Function Documentation

decode_mcu()

decode_mcu	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

Definition at line 540 of file jdhuff.cpp.

References ASSIGN_STATE, BITREAD_LOAD_STATE, BITREAD_SAVE_STATE, BITREAD_STATE_VARS, CHECK_BIT_BUFFER, DCTSIZE2, DROP_BITS, FALSE, GET_BITS, HUFF_DECODE, HUFF_EXTEND, jpeg_natural_order, process_restart(), huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, huff_entropy_encoder::saved, and TRUE.

Referenced by jinit_huff_decoder().

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jinit_huff_decoder()

jinit_huff_decoder

(

j_decompress_ptr

cinfo

)

Definition at line 669 of file jdhuff.cpp.

References huff_entropy_encoder::ac_derived_tbls, huff_entropy_encoder::dc_derived_tbls, decode_mcu(), JPOOL_IMAGE, NUM_HUFF_TBLS, huff_entropy_encoder::pub, SIZEOF, and start_pass_huff_decoder().

Referenced by master_selection(), and transdecode_master_selection().

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jpeg_fill_bit_buffer()

jpeg_fill_bit_buffer	(	bitread_working_state *	state,
		bit_buf_type	get_buffer,
		int	bits_left,
		int	nbits
	)

Definition at line 299 of file jdhuff.cpp.

References jpeg_source_mgr::bytes_in_buffer, jpeg_decompress_struct::entropy, FALSE, GETJOCTET, jpeg_entropy_decoder::insufficient_data, MIN_GET_BITS, jpeg_source_mgr::next_input_byte, jpeg_decompress_struct::src, TRUE, jpeg_decompress_struct::unread_marker, and WARNMS.

jpeg_huff_decode()

jpeg_huff_decode	(	bitread_working_state *	state,
		bit_buf_type	get_buffer,
		int	bits_left,
		d_derived_tbl *	htbl,
		int	min_bits
	)

Definition at line 425 of file jdhuff.cpp.

References CHECK_BIT_BUFFER, GET_BITS, and WARNMS.

jpeg_make_d_derived_tbl()

jpeg_make_d_derived_tbl	(	j_decompress_ptr	cinfo,
		boolean	isDC,
		int	tblno,
		d_derived_tbl **	pdtbl
	)

Definition at line 147 of file jdhuff.cpp.

References JHUFF_TBL::bits, ctr, ERREXIT, ERREXIT1, HUFF_LOOKAHEAD, JHUFF_TBL::huffval, JPOOL_IMAGE, d_derived_tbl::look_nbits, d_derived_tbl::look_sym, d_derived_tbl::maxcode, MEMZERO, NUM_HUFF_TBLS, d_derived_tbl::pub, SIZEOF, and d_derived_tbl::valoffset.

Referenced by start_pass_huff_decoder(), and start_pass_phuff_decoder().

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process_restart()

process_restart

(

j_decompress_ptr

cinfo

)

Definition at line 494 of file jdhuff.cpp.

References FALSE, savable_state::last_dc_val, huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, huff_entropy_encoder::saved, and TRUE.

Referenced by decode_mcu().

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start_pass_huff_decoder()

start_pass_huff_decoder

(

j_decompress_ptr

cinfo

)

Definition at line 78 of file jdhuff.cpp.

References huff_entropy_encoder::ac_derived_tbls, jpeg_component_info::ac_tbl_no, jpeg_component_info::component_needed, compptr, huff_entropy_encoder::dc_derived_tbls, jpeg_component_info::dc_tbl_no, jpeg_component_info::DCT_scaled_size, DCTSIZE2, FALSE, jpeg_make_d_derived_tbl(), savable_state::last_dc_val, huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, huff_entropy_encoder::saved, TRUE, and WARNMS.

Referenced by jinit_huff_decoder().

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Variable Documentation

extend_offset

const int extend_offset[16]

static

Initial value:

= 
        {0,     -1,   -3,       -7,     -15,   -31,   -63,      -127,
         -255, -511, -1023, -2047, -4095, -8191, -16383, -32767}

Definition at line 482 of file jdhuff.cpp.

extend_test

const int extend_test[16]

static

Initial value:

= 
        {0,              0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040,
         0x0080, 0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000}

Definition at line 478 of file jdhuff.cpp.