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greg |
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/* Copyright (c) 1991 Regents of the University of California */
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/* SCCSid "$SunId$ LBL" */
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/*
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* Definitions for resolution line in image file.
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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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/* 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 or; /* 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)->or & YMAJOR ? (rs)->xr : (rs)->yr)
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#define numscans(rs) ((rs)->or & 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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extern char *fgets(), *resolu2str();
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