jdhuff.h File Reference

Go to the source code of this file.

Classes
struct	d_derived_tbl
struct	bitread_perm_state
struct	bitread_working_state

Macros
#define	HUFF_LOOKAHEAD   8 /* # of bits of lookahead */
#define	BIT_BUF_SIZE   32 /* size of buffer in bits */
#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)))) & ((1 << (nbits)) - 1))
#define	PEEK_BITS(nbits)    (((int)(get_buffer >> (bits_left - (nbits)))) & ((1 << (nbits)) - 1))
#define	DROP_BITS(nbits)   (bits_left -= (nbits))
#define	HUFF_DECODE(result, state, htbl, failaction, slowlabel)

Typedefs
typedef INT32	bit_buf_type

Functions
jpeg_make_d_derived_tbl	JPP ((j_decompress_ptr cinfo, boolean isDC, int tblno, d_derived_tbl **pdtbl))
jpeg_fill_bit_buffer	JPP ((bitread_working_state *state, bit_buf_type get_buffer, int bits_left, int nbits))
jpeg_huff_decode	JPP ((bitread_working_state *state, bit_buf_type get_buffer, int bits_left, d_derived_tbl *htbl, int min_bits))

Macro Definition Documentation

BIT_BUF_SIZE

#define BIT_BUF_SIZE   32 /* size of buffer in bits */

Definition at line 69 of file jdhuff.h.

BITREAD_LOAD_STATE

#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;

Definition at line 106 of file jdhuff.h.

BITREAD_SAVE_STATE

#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

Definition at line 113 of file jdhuff.h.

BITREAD_STATE_VARS

#define BITREAD_STATE_VARS

Value:

        bit_buf_type get_buffer; \
        int bits_left;           \
        bitread_working_state br_state

Definition at line 101 of file jdhuff.h.

CHECK_BIT_BUFFER

#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;                                     \
                }                                                                      \
        }

Definition at line 137 of file jdhuff.h.

DROP_BITS

#define DROP_BITS

(

nbits

)

(bits_left -= (nbits))

Definition at line 156 of file jdhuff.h.

GET_BITS

#define GET_BITS

(

nbits

)

(((int)(get_buffer >> (bits_left -= (nbits)))) & ((1 << (nbits)) - 1))

Definition at line 150 of file jdhuff.h.

HUFF_DECODE

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

Definition at line 181 of file jdhuff.h.

HUFF_LOOKAHEAD

#define HUFF_LOOKAHEAD   8 /* # of bits of lookahead */

Definition at line 20 of file jdhuff.h.

PEEK_BITS

#define PEEK_BITS

(

nbits

)

(((int)(get_buffer >> (bits_left - (nbits)))) & ((1 << (nbits)) - 1))

Definition at line 153 of file jdhuff.h.

Typedef Documentation

bit_buf_type

typedef INT32 bit_buf_type

Definition at line 68 of file jdhuff.h.

Function Documentation

JPP() [1/3]

jpeg_huff_decode JPP

(

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

)

JPP() [2/3]

jpeg_fill_bit_buffer JPP

(

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

)

JPP() [3/3]

jpeg_make_d_derived_tbl JPP

(

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

)