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#ifndef lint |
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static const char RCSid[] = "$Id: resolu.c,v 2.8 2023/06/21 15:43:16 greg Exp $"; |
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#endif |
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/* |
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* Read and write image resolutions. |
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* |
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* Externals declared in resolu.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <stdlib.h> |
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#include <stdio.h> |
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|
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#include "resolu.h" |
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|
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|
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char resolu_buf[RESOLU_BUFLEN]; /* resolution line buffer */ |
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|
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|
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void |
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fputresolu( /* put out picture dimensions */ |
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int ord, /* scanline ordering */ |
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int sl, int ns, /* scanline length and number */ |
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FILE *fp |
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) |
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{ |
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RESOLU rs; |
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|
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if ((rs.rt = ord) & YMAJOR) { |
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rs.xr = sl; |
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rs.yr = ns; |
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} else { |
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rs.xr = ns; |
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rs.yr = sl; |
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} |
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fputsresolu(&rs, fp); |
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} |
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|
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|
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int |
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fgetresolu( /* get picture dimensions */ |
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int *sl, int *ns, /* scanline length and number */ |
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FILE *fp |
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) |
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{ |
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RESOLU rs; |
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|
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if (!fgetsresolu(&rs, fp)) |
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return(-1); |
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if (rs.rt & YMAJOR) { |
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*sl = rs.xr; |
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*ns = rs.yr; |
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} else { |
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*sl = rs.yr; |
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*ns = rs.xr; |
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} |
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return(rs.rt); |
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} |
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|
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|
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char * |
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resolu2str( /* convert resolution struct to line */ |
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char *buf, |
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RESOLU *rp |
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) |
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{ |
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if (rp->rt&YMAJOR) |
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sprintf(buf, "%cY %8d %cX %8d\n", |
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rp->rt&YDECR ? '-' : '+', rp->yr, |
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rp->rt&XDECR ? '-' : '+', rp->xr); |
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else |
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sprintf(buf, "%cX %8d %cY %8d\n", |
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rp->rt&XDECR ? '-' : '+', rp->xr, |
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rp->rt&YDECR ? '-' : '+', rp->yr); |
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return(buf); |
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} |
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|
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|
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int |
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str2resolu( /* convert resolution line to struct */ |
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RESOLU *rp, |
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char *buf |
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) |
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{ |
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char *xndx, *yndx; |
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char *cp; |
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|
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if (buf == NULL) |
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return(0); |
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xndx = yndx = NULL; |
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for (cp = buf; *cp; cp++) |
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if (*cp == 'X') |
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xndx = cp; |
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else if (*cp == 'Y') |
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yndx = cp; |
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if (xndx == NULL || yndx == NULL) |
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return(0); |
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rp->rt = 0; |
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if (xndx > yndx) rp->rt |= YMAJOR; |
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if (xndx[-1] == '-') rp->rt |= XDECR; |
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if (yndx[-1] == '-') rp->rt |= YDECR; |
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if ((rp->xr = atoi(xndx+1)) <= 0) |
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return(0); |
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if ((rp->yr = atoi(yndx+1)) <= 0) |
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return(0); |
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return(1); |
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} |
