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/* RCSid $Id: resolu.h,v 2.11 2009/05/21 18:08:43 greg Exp $ */
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/*
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* Definitions for resolution line in image file.
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*
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* Include after <stdio.h>
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*
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* True image orientation is defined by an xy coordinate system
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* whose origin is at the lower left corner of the image, with
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* x increasing to the right and y increasing in the upward direction.
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* This true orientation is independent of how the pixels are actually
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* ordered in the file, which is indicated by the resolution line.
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* This line is of the form "{+-}{XY} xyres {+-}{YX} yxres\n".
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* A typical line for a 1024x600 image might be "-Y 600 +X 1024\n",
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* indicating that the scanlines are in English text order (PIXSTANDARD).
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*/
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#ifndef _RAD_RESOLU_H_
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#define _RAD_RESOLU_H_
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#include <time.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* flags for scanline ordering */
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#define XDECR 1
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#define YDECR 2
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#define YMAJOR 4
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/* standard scanline ordering */
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#define PIXSTANDARD (YMAJOR|YDECR)
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#define PIXSTDFMT "-Y %d +X %d\n"
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/* structure for image dimensions */
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typedef struct {
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int rt; /* orientation (from flags above) */
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int xr, yr; /* x and y resolution */
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} RESOLU;
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/* macros to get scanline length and number */
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#define scanlen(rs) ((rs)->rt & YMAJOR ? (rs)->xr : (rs)->yr)
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#define numscans(rs) ((rs)->rt & YMAJOR ? (rs)->yr : (rs)->xr)
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/* resolution string buffer and its size */
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#define RESOLU_BUFLEN 32
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extern char resolu_buf[RESOLU_BUFLEN];
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/* macros for reading/writing resolution struct */
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#define fputsresolu(rs,fp) fputs(resolu2str(resolu_buf,rs),fp)
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#define fgetsresolu(rs,fp) str2resolu(rs, \
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fgets(resolu_buf,RESOLU_BUFLEN,fp))
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/* reading/writing of standard ordering */
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#define fprtresolu(sl,ns,fp) fprintf(fp,PIXSTDFMT,ns,sl)
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#define fscnresolu(sl,ns,fp) (fscanf(fp,PIXSTDFMT,ns,sl)==2)
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/* identify header lines */
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#define isheadid(s) headidval(NULL,s)
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#define isformat(s) formatval(NULL,s)
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#define isdate(s) dateval(NULL,s)
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#define isgmt(s) gmtval(NULL,s)
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#define LATLONSTR "LATLONG="
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#define LLATLONSTR 8
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#define islatlon(hl) (!strncmp(hl,LATLONSTR,LLATLONSTR))
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#define latlonval(ll,hl) sscanf((hl)+LLATLONSTR, "%f %f", \
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&(ll)[0],&(ll)[1])
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#define fputlatlon(lat,lon,fp) fprintf(fp,"%s %.6f %.6f\n",LATLONSTR,lat,lon)
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/* defined in resolu.c */
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extern void fputresolu(int ord, int sl, int ns, FILE *fp);
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extern int fgetresolu(int *sl, int *ns, FILE *fp);
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extern char * resolu2str(char *buf, RESOLU *rp);
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extern int str2resolu(RESOLU *rp, char *buf);
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/* defined in header.c */
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extern void newheader(const char *t, FILE *fp);
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extern int headidval(char *r, const char *s);
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extern int dateval(time_t *t, const char *s);
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extern int gmtval(time_t *t, const char *s);
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extern void fputdate(time_t t, FILE *fp);
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extern void fputnow(FILE *fp);
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extern void printargs(int ac, char **av, FILE *fp);
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extern int formatval(char *r, const char *s);
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extern void fputformat(const char *s, FILE *fp);
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typedef int gethfunc(char *s, void *p); /* callback to process header lines */
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extern int getheader(FILE *fp, gethfunc *f, void *p);
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extern int globmatch(const char *pat, const char *str);
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extern int checkheader(FILE *fin, char *fmt, FILE *fout);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_RESOLU_H_ */
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