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