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/* #ident "@(#)x11:contrib/clients/xloadimage/img.h 1.5 93/07/23 Labtam" */
/*
** img.h - structures/definitions for GEM Bit Image format conversion
**
** Tim Northrup <tim@BRS.Com>
**
** Version 0.1 -- 4/25/91 -- Initial cut
**
** Copyright (C) 1991 Tim Northrup
** (see file "tgncpyrght.h" for complete copyright information)
*/
#ifndef GEM_H
#define GEM_H
/*
** Standard IMG Header Structure (8 words long)
**
** May be followed by implementation-dependent information, so the
** value of hlen should be checked on input.
*/
typedef struct {
short vers, /* image version number */
hlen, /* header length (in words) */
colors, /* number of color planes (1=mono) */
patlen, /* pattern length (for encoding) */
pixw, pixh, /* pixel dimensions (in microns) */
llen, lines; /* pixels/line and number of lines */
} IMG_Header;
/*
** Header record values used when creating an IMG file
*/
#define DEF_VERSION 1 /* default version number (on output) */
#define DEF_HLEN 8 /* always standard header */
#define DEF_COLORS 1 /* always B/W pics */
#define DEF_PATLEN 1 /* easiest pattern size */
#define DEF_PIXW 85 /* just a guess on this one */
#define DEF_PIXH 85 /* assumed 1:1 aspect ratio */
/*
** Program limits and other constants
*/
#define MAX_SCANLINE 1024 /* max bytes for 1 scanline */
#define MAX_SLREPEAT 255 /* max repititions of scanline */
#define MAX_PATREPEAT 255 /* max repititions of pattern */
#define MAX_BYTEREPEAT 127 /* max repititions of byte value */
#define MAX_LITERAL 255 /* max literal length allowed */
#define BYTE_FLAG 0x00 /* first byte 0 the ... */
#define BYTE_SLREPEAT 0x00 /* second 0 means scanline repeat */
#define BYTE_SLFLAG 0xFF /* always followed by FF (?) */
#define BYTE_LITERAL 0x80 /* char 80h - flag literal string */
#define BYTE_BLACK 0xFF /* byte is all 1's */
#define BIT_BLACK 1 /* single black bit */
#define BYTE_WHITE 0x00 /* byte is all 0's */
#define BIT_WHITE 0 /* single white bit */
#define RUN_BLACK 0x80 /* bit flag for run of all 0's or 1's */
#define RUN_WHITE 0x00
#define RUN_LENGTH(X) ((X) & 0x7F)
#define RUN_COLOR(X) ((((X) & RUN_BLACK) == RUN_BLACK)?BIT_BLACK:BIT_WHITE)
#define PIXEL_COLOR(X) ((((X) & 0x01) == 1)?BIT_BLACK:BIT_WHITE)
#endif /* GEM_H */
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