Source code of Windows XP (NT5)
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typedef struct { __int64 put_buffer_64; //mmx bit-accumulation buffer
INT32 put_buffer; /* current bit-accumulation buffer */ int put_bits; /* # of bits now in it */ int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */} savable_state;
/* This macro is to work around compilers with missing or broken
* structure assignment. You'll need to fix this code if you have * such a compiler and you change MAX_COMPS_IN_SCAN. */
//#ifndef NO_STRUCT_ASSIGN
//#define ASSIGN_STATE(dest,src) ((dest) = (src))
//#else
// pull out the assignments to put_buffer and put_bits since they are implentation dependent
#if MAX_COMPS_IN_SCAN == 4
#define ASSIGN_STATE(dest,src) \
((dest).last_dc_val[0] = (src).last_dc_val[0], \ (dest).last_dc_val[1] = (src).last_dc_val[1], \ (dest).last_dc_val[2] = (src).last_dc_val[2], \ (dest).last_dc_val[3] = (src).last_dc_val[3]) /*((dest).put_buffer = (src).put_buffer, \
(dest).put_bits = (src).put_bits, */ #endif
//#endif
typedef struct { struct jpeg_entropy_encoder pub; /* public fields */
savable_state saved; /* Bit buffer & DC state at start of MCU */
/* These fields are NOT loaded into local working state. */ unsigned int restarts_to_go; /* MCUs left in this restart interval */ int next_restart_num; /* next restart number to write (0-7) */
/* Pointers to derived tables (these workspaces have image lifespan) */ c_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS]; c_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
#ifdef ENTROPY_OPT_SUPPORTED /* Statistics tables for optimization */
long * dc_count_ptrs[NUM_HUFF_TBLS]; long * ac_count_ptrs[NUM_HUFF_TBLS];#endif
} huff_entropy_encoder;
typedef huff_entropy_encoder * huff_entropy_ptr;
/* Working state while writing an MCU.
* This struct contains all the fields that are needed by subroutines. */
typedef struct {// make the next two variables global for easy access in mmx version
// JOCTET * next_output_byte; /* => next byte to write in buffer */
// size_t free_in_buffer; /* # of byte spaces remaining in buffer */
// savable_state cur; /* Current bit buffer & DC state */
// flatten (instantiate) savable state here
__int64 put_buffer_64; // mmx bit accumulation buffer
INT32 put_buffer; /* current bit-accumulation buffer */ int put_bits; /* # of bits now in it */ int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */ j_compress_ptr cinfo; /* dump_buffer needs access to this */} working_state;//global vaiables
__int64 put_buffer_64; // INT32 put_buffer;
int put_bits; JOCTET * next_output_byte; /* => next byte to write in buffer */ size_t free_in_buffer; /* # of byte spaces remaining in buffer */ //boolean mmx_cpu=1;
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