1 /* $Header: /cvsroot/osrs/libtiff/tools/rasterfile.h,v 1.3 2003/11/12 19:14:33 dron Exp $ */ 2 3 /* 4 * Description of header for files containing raster images 5 */ 6 struct 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