| 1 |
/* RCSid $Id: resolu.h,v 2.15 2020/04/06 04:00:08 greg Exp $ */ |
| 2 |
/* |
| 3 |
* Definitions for resolution line in image file. |
| 4 |
* |
| 5 |
* Include after <stdio.h> |
| 6 |
* |
| 7 |
* True image orientation is defined by an xy coordinate system |
| 8 |
* whose origin is at the lower left corner of the image, with |
| 9 |
* x increasing to the right and y increasing in the upward direction. |
| 10 |
* This true orientation is independent of how the pixels are actually |
| 11 |
* ordered in the file, which is indicated by the resolution line. |
| 12 |
* This line is of the form "{+-}{XY} xyres {+-}{YX} yxres\n". |
| 13 |
* A typical line for a 1024x600 image might be "-Y 600 +X 1024\n", |
| 14 |
* indicating that the scanlines are in English text order (PIXSTANDARD). |
| 15 |
*/ |
| 16 |
#ifndef _RAD_RESOLU_H_ |
| 17 |
#define _RAD_RESOLU_H_ |
| 18 |
|
| 19 |
#ifdef __cplusplus |
| 20 |
extern "C" { |
| 21 |
#endif |
| 22 |
|
| 23 |
/* flags for scanline ordering */ |
| 24 |
#define XDECR 1 |
| 25 |
#define YDECR 2 |
| 26 |
#define YMAJOR 4 |
| 27 |
|
| 28 |
/* standard scanline ordering */ |
| 29 |
#define PIXSTANDARD (YMAJOR|YDECR) |
| 30 |
#define PIXSTDFMT "-Y %8d +X %8d\n" |
| 31 |
|
| 32 |
/* structure for image dimensions */ |
| 33 |
typedef struct { |
| 34 |
int rt; /* orientation (from flags above) */ |
| 35 |
int xr, yr; /* x and y resolution */ |
| 36 |
} RESOLU; |
| 37 |
|
| 38 |
/* macros to get scanline length and number */ |
| 39 |
#define scanlen(rs) ((rs)->rt & YMAJOR ? (rs)->xr : (rs)->yr) |
| 40 |
#define numscans(rs) ((rs)->rt & YMAJOR ? (rs)->yr : (rs)->xr) |
| 41 |
|
| 42 |
/* resolution string buffer and its size */ |
| 43 |
#define RESOLU_BUFLEN 32 |
| 44 |
extern char resolu_buf[RESOLU_BUFLEN]; |
| 45 |
|
| 46 |
/* macros for reading/writing resolution struct */ |
| 47 |
#define fputsresolu(rs,fp) fputs(resolu2str(resolu_buf,rs),fp) |
| 48 |
#define fgetsresolu(rs,fp) str2resolu(rs, \ |
| 49 |
fgets(resolu_buf,RESOLU_BUFLEN,fp)) |
| 50 |
|
| 51 |
/* reading/writing of standard ordering */ |
| 52 |
#define fprtresolu(sl,ns,fp) fprintf(fp,PIXSTDFMT,ns,sl) |
| 53 |
#define fscnresolu(sl,ns,fp) (fgetresolu(sl,ns,fp)==PIXSTANDARD) |
| 54 |
|
| 55 |
/* defined in resolu.c */ |
| 56 |
extern void fputresolu(int ord, int sl, int ns, FILE *fp); |
| 57 |
extern int fgetresolu(int *sl, int *ns, FILE *fp); |
| 58 |
extern char * resolu2str(char *buf, RESOLU *rp); |
| 59 |
extern int str2resolu(RESOLU *rp, char *buf); |
| 60 |
|
| 61 |
#ifdef __cplusplus |
| 62 |
} |
| 63 |
#endif |
| 64 |
#endif /* _RAD_RESOLU_H_ */ |
| 65 |
|
