globals.h

基于块方向的图像无损压缩代码

/*++*
* Copyright (c) 1997 University of British Columbia. All rights reserved.
*
*       File:           encode.h
*       Pourpose:       contains global functions.
*
*       Author:         Ismaeil R. Ismaeil, Aug. 1997
*
*--*/

#include <stdio.h>
#include <malloc.h>
#include <math.h>
#include <time.h>

#ifndef CLOCKS_PER_SEC
#define CLOCKS_PER_SEC 1e6
#endif

extern	FILE     *ifp,*ofp;
extern	int      **in_buf;
extern	int	     **out_buf;

	struct Image_Coord { int x, y; };

extern	struct Image_Coord pdim, dim, x, a, b, c, d;


extern	int bit_set_mask[32];// =
//	{0x00000001,0x00000002,0x00000004,0x00000008,
//	0x00000010,0x00000020,0x00000040,0x00000080,
//	0x00000100,0x00000200,0x00000400,0x00000800,
//	0x00001000,0x00002000,0x00004000,0x00008000,
//	0x00010000,0x00020000,0x00040000,0x00080000,
//	0x00100000,0x00200000,0x00400000,0x00800000,
//	0x01000000,0x02000000,0x04000000,0x08000000,
//	0x10000000,0x20000000,0x40000000,0x80000000};

extern	int current_write_byte;
extern	int current_read_byte;
extern	int read_position;
extern	int write_position;
extern	int  count;

extern 	int J[32];//[] = {0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,
//           4,5,5,6,6,7,7,8,9,10,11,12,13,14,15};

extern	int P, T1, T2, T3, MAXVAL;
extern	int Ix, Ra, Rb, Rc, Rd;
extern	int EOLine;
extern	int RANGE;
extern	int A[367], B[365], C[365], N[367], Nn[367];
extern	int RUNindex, RUNval, RUNcnt;
extern	int D[3], Q[3], q;
extern	int SIGN;
extern	int Px, Rx;
extern	int Errval, MErrval, EMErrval;
extern	int k, TEMP;
extern	int RItype, map;
	/* updated variables */
extern	int LIMIT, qbpp, bpp;

#define mput1()\
{current_write_byte|=bit_set_mask[write_position--];\
if (write_position<0) {putc(current_write_byte,ofp);\
if(current_write_byte == 255)\
write_position=6;else write_position=7; current_write_byte=0;}}

#define mput0()\
{write_position--;if(write_position<0){putc(current_write_byte,ofp);\
write_position=7;\
current_write_byte=0;}}

/* MAX and MIN macros */
#define MAX(x,y) ((x > y) ? x:y)
#define MIN(x,y) ((x > y) ? y:x)
#define ABS(x) ((x < 0) ? -x:x)	


#define MAXIMUM_IMAGE_HEIGHT 65535
#define MAXIMUM_IMAGE_WIDTH 65535
#define MAXIMUM_SOURCES 16
#define MAXIMUM_COMPONENTS 256

#define MAX_C 127    /* maximum allowed value of C[0..364] */
#define MIN_C -128   /* minimum allowed value of C[0..364] */
#define NEAR_LOSSLESS  0      /*difference bound for near-lossless mode */
#define RESET 64     /* threshold value at which A, B, and N are halved */