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/* RCSid $Id: idmap.h,v 2.2 2019/07/26 18:37:21 greg Exp $ */
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/*
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* Definitions and delcarations for loading identifier maps
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*
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* Include after stdio.h
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* Includes resolu.h
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*/
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#ifndef _RAD_IDMAP_H_
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#define _RAD_IDMAP_H_
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#include "resolu.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define IDMAP8FMT "8-bit_indexed_name"
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#define IDMAP16FMT "16-bit_indexed_name"
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#define IDMAP24FMT "24-bit_indexed_name"
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#define IDMAPFMT "*-bit_indexed_name"
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#define HF_HEADOUT 0x2 /* copy header to stdout */
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#define HF_RESOUT 0x8 /* copy resolution */
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#define HF_STDERR 0x10 /* report errors to stderr */
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/* Structure for reading identifier maps */
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typedef struct {
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FILE *finp; /* input file pointer */
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long dstart; /* start of data */
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RESOLU res; /* input resolution */
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int bytespi; /* 1, 2, or 3 bytes per index */
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int nids; /* ID count */
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int *idoffset; /* offsets to identifiers */
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char idtable[1]; /* nul-terminated ID strings */
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} IDMAP;
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/* Get indexed ID */
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#define mapID(mp,i) ( (i) >= (mp)->nids ? (char *)NULL : \
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(mp)->idtable+(mp)->idoffset[i] )
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/* Open ID map file for reading, copying info to stdout based on hflags */
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extern IDMAP *idmap_ropen(const char *fname, int hflags);
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/* Read the next ID index from input */
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extern int idmap_next_i(IDMAP *idmp);
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/* Read the next ID from input */
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extern const char *idmap_next(IDMAP *idmp);
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/* Seek to a specific pixel position in ID map */
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extern int idmap_seek(IDMAP *idmp, int x, int y);
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/* Read ID at a pixel position */
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extern const char *idmap_pix(IDMAP *idmp, int x, int y);
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/* Close ID map and free resources */
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extern void idmap_close(IDMAP *idmp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_IDMAP_H_ */
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