1/* $Header: /cvs/maptools/cvsroot/libtiff/tools/rasterfile.h,v 1.3.2.1 2010-06-08 18:50:44 bfriesen Exp $ */
2
3/*
4 * Description of header for files containing raster images
5 */
6struct rasterfile {
7	char	ras_magic[4];		/* magic number */
8	long	ras_width;		/* width (pixels) of image */
9	long	ras_height;		/* height (pixels) of image */
10	long	ras_depth;		/* depth (1, 8, or 24 bits) of pixel */
11	long	ras_length;		/* length (bytes) of image */
12	long	ras_type;		/* type of file; see RT_* below */
13	long	ras_maptype;		/* type of colormap; see RMT_* below */
14	long	ras_maplength;		/* length (bytes) of following map */
15	/* color map follows for ras_maplength bytes, followed by image */
16};
17#define	RAS_MAGIC	"\x59\xa6\x6a\x95"
18#define	RAS_MAGIC_INV	"\x95\x6a\xa6\x59"
19
20	/* Sun supported ras_type's */
21#define RT_OLD		0	/* Raw pixrect image in 68000 byte order */
22#define RT_STANDARD	1	/* Raw pixrect image in 68000 byte order */
23#define RT_BYTE_ENCODED	2	/* Run-length compression of bytes */
24#define RT_EXPERIMENTAL 0xffff	/* Reserved for testing */
25
26	/* Sun registered ras_maptype's */
27#define RMT_RAW		2
28	/* Sun supported ras_maptype's */
29#define RMT_NONE	0	/* ras_maplength is expected to be 0 */
30#define RMT_EQUAL_RGB	1	/* red[ras_maplength/3],green[],blue[] */
31
32/*
33 * NOTES:
34 * 	Each line of the image is rounded out to a multiple of 16 bits.
35 *   This corresponds to the rounding convention used by the memory pixrect
36 *   package (/usr/include/pixrect/memvar.h) of the SunWindows system.
37 *	The ras_encoding field (always set to 0 by Sun's supported software)
38 *   was renamed to ras_length in release 2.0.  As a result, rasterfiles
39 *   of type 0 generated by the old software claim to have 0 length; for
40 *   compatibility, code reading rasterfiles must be prepared to compute the
41 *   true length from the width, height, and depth fields.
42 */
43/*
44 * Local Variables:
45 * mode: c
46 * c-basic-offset: 8
47 * fill-column: 78
48 * End:
49 */
50