D:/Lukas Daten/Programmierungen/C++/HLC/Sonstige/Software/SoftPixelEngine/sources/Plugins/jpeglib/jdhuff.c File Reference

#include "jinclude.h"
#include "jpeglib.h"

Classes
struct	d_derived_tbl
struct	bitread_perm_state
struct	bitread_working_state
struct	savable_state
struct	huff_entropy_decoder
Defines
#define	JPEG_INTERNALS
#define	HUFF_LOOKAHEAD   8
#define	BIT_BUF_SIZE   32
#define	BITREAD_STATE_VARS
#define	BITREAD_LOAD_STATE(cinfop, permstate)
#define	BITREAD_SAVE_STATE(cinfop, permstate)
#define	CHECK_BIT_BUFFER(state, nbits, action)
#define	GET_BITS(nbits)   (((int) (get_buffer >> (bits_left -= (nbits)))) & BIT_MASK(nbits))
#define	PEEK_BITS(nbits)   (((int) (get_buffer >> (bits_left - (nbits)))) & BIT_MASK(nbits))
#define	DROP_BITS(nbits)   (bits_left -= (nbits))
#define	HUFF_DECODE(result, state, htbl, failaction, slowlabel)
#define	ASSIGN_STATE(dest, src)   ((dest) = (src))
#define	MIN_GET_BITS   (BIT_BUF_SIZE-7)
#define	BIT_MASK(nbits)   bmask[nbits]
#define	HUFF_EXTEND(x, s)   ((x) <= bmask[(s) - 1] ? (x) - bmask[s] : (x))
Typedefs
typedef INT32	bit_buf_type
typedef huff_entropy_decoder *	huff_entropy_ptr
Functions
	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, register bit_buf_type get_buffer, register int bits_left, int nbits)
	jpeg_huff_decode (bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, d_derived_tbl *htbl, int min_bits)
	process_restart (j_decompress_ptr cinfo)
	decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	decode_mcu_sub (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	start_pass_huff_decoder (j_decompress_ptr cinfo)
	jinit_huff_decoder (j_decompress_ptr cinfo)

---

Define Documentation

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

#define BIT_BUF_SIZE   32

#define BIT_MASK

(

nbits

)

bmask[nbits]

#define BITREAD_LOAD_STATE	(		cinfop,
			permstate
	)

Value:

br_state.cinfo = cinfop; \
        br_state.next_input_byte = cinfop->src->next_input_byte; \
        br_state.bytes_in_buffer = cinfop->src->bytes_in_buffer; \
        get_buffer = permstate.get_buffer; \
        bits_left = permstate.bits_left;

#define BITREAD_SAVE_STATE	(		cinfop,
			permstate
	)

Value:

cinfop->src->next_input_byte = br_state.next_input_byte; \
        cinfop->src->bytes_in_buffer = br_state.bytes_in_buffer; \
        permstate.get_buffer = get_buffer; \
        permstate.bits_left = bits_left

#define BITREAD_STATE_VARS

Value:

register bit_buf_type get_buffer;  \
        register int bits_left;  \
        bitread_working_state br_state

#define CHECK_BIT_BUFFER	(		state,
			nbits,
			action
	)

Value:

{ if (bits_left < (nbits)) {  \
            if (! jpeg_fill_bit_buffer(&(state),get_buffer,bits_left,nbits))  \
              { action; }  \
            get_buffer = (state).get_buffer; bits_left = (state).bits_left; } }

#define DROP_BITS

(

nbits

)

(bits_left -= (nbits))

#define GET_BITS

(

nbits

)

(((int) (get_buffer >> (bits_left -= (nbits)))) & BIT_MASK(nbits))

#define HUFF_DECODE	(		result,
			state,
			htbl,
			failaction,
			slowlabel
	)

Value:

{ register int nb, look; \
  if (bits_left < HUFF_LOOKAHEAD) { \
    if (! jpeg_fill_bit_buffer(&state,get_buffer,bits_left, 0)) {failaction;} \
    get_buffer = state.get_buffer; bits_left = state.bits_left; \
    if (bits_left < HUFF_LOOKAHEAD) { \
      nb = 1; goto slowlabel; \
    } \
  } \
  look = PEEK_BITS(HUFF_LOOKAHEAD); \
  if ((nb = htbl->look_nbits[look]) != 0) { \
    DROP_BITS(nb); \
    result = htbl->look_sym[look]; \
  } else { \
    nb = HUFF_LOOKAHEAD+1; \
slowlabel: \
    if ((result=jpeg_huff_decode(&state,get_buffer,bits_left,htbl,nb)) < 0) \
        { failaction; } \
    get_buffer = state.get_buffer; bits_left = state.bits_left; \
  } \
}

#define HUFF_EXTEND	(		x,
			s
	)			((x) <= bmask[(s) - 1] ? (x) - bmask[s] : (x))

#define HUFF_LOOKAHEAD   8

#define JPEG_INTERNALS

#define MIN_GET_BITS   (BIT_BUF_SIZE-7)

#define PEEK_BITS

(

nbits

)

(((int) (get_buffer >> (bits_left - (nbits)))) & BIT_MASK(nbits))

---

Typedef Documentation

typedef INT32 bit_buf_type

typedef huff_entropy_decoder* huff_entropy_ptr

---

Function Documentation

decode_mcu	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

decode_mcu_AC_first	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

decode_mcu_AC_refine	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

decode_mcu_DC_first	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

decode_mcu_DC_refine	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

decode_mcu_sub	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

jinit_huff_decoder

(

j_decompress_ptr

cinfo

)

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

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

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

process_restart

(

j_decompress_ptr

cinfo

)

start_pass_huff_decoder

(

j_decompress_ptr

cinfo

)