/* $Header: /cvs/maptools/cvsroot/libtiff/tools/rasterfile.h,v 1.3 2003/11/12 19:14:33 dron Exp $ */ /* * Description of header for files containing raster images */ struct rasterfile { char ras_magic[4]; /* magic number */ long ras_width; /* width (pixels) of image */ long ras_height; /* height (pixels) of image */ long ras_depth; /* depth (1, 8, or 24 bits) of pixel */ long ras_length; /* length (bytes) of image */ long ras_type; /* type of file; see RT_* below */ long ras_maptype; /* type of colormap; see RMT_* below */ long ras_maplength; /* length (bytes) of following map */ /* color map follows for ras_maplength bytes, followed by image */ }; #define RAS_MAGIC "\x59\xa6\x6a\x95" #define RAS_MAGIC_INV "\x95\x6a\xa6\x59" /* Sun supported ras_type's */ #define RT_OLD 0 /* Raw pixrect image in 68000 byte order */ #define RT_STANDARD 1 /* Raw pixrect image in 68000 byte order */ #define RT_BYTE_ENCODED 2 /* Run-length compression of bytes */ #define RT_EXPERIMENTAL 0xffff /* Reserved for testing */ /* Sun registered ras_maptype's */ #define RMT_RAW 2 /* Sun supported ras_maptype's */ #define RMT_NONE 0 /* ras_maplength is expected to be 0 */ #define RMT_EQUAL_RGB 1 /* red[ras_maplength/3],green[],blue[] */ /* * NOTES: * Each line of the image is rounded out to a multiple of 16 bits. * This corresponds to the rounding convention used by the memory pixrect * package (/usr/include/pixrect/memvar.h) of the SunWindows system. * The ras_encoding field (always set to 0 by Sun's supported software) * was renamed to ras_length in release 2.0. As a result, rasterfiles * of type 0 generated by the old software claim to have 0 length; for * compatibility, code reading rasterfiles must be prepared to compute the * true length from the width, height, and depth fields. */