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/*
* SGI image file format library definitions.
*
* Copyright 1997-1998 Michael Sweet (mike@easysw.com)
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef __SGI_LIB_H__
#define __SGI_LIB_H__
G_BEGIN_DECLS
/*
* Constants...
*/
# define SGI_MAGIC 474 /* Magic number in image file */
# define SGI_READ 0 /* Read from an SGI image file */
# define SGI_WRITE 1 /* Write to an SGI image file */
# define SGI_COMP_NONE 0 /* No compression */
# define SGI_COMP_RLE 1 /* Run-length encoding */
# define SGI_COMP_ARLE 2 /* Aggressive run-length encoding */
/*
* Image structure...
*/
typedef struct
{
FILE *file; /* Image file */
int mode, /* File open mode */
bpp, /* Bytes per pixel/channel */
comp, /* Compression */
swapBytes; /* SwapBytes flag */
unsigned short xsize, /* Width in pixels */
ysize, /* Height in pixels */
zsize; /* Number of channels */
long firstrow, /* File offset for first row */
nextrow, /* File offset for next row */
**table, /* Offset table for compression */
**length; /* Length table for compression */
unsigned short *arle_row; /* Advanced RLE compression buffer */
long arle_offset, /* Advanced RLE buffer offset */
arle_length; /* Advanced RLE buffer length */
} sgi_t;
/*
* Prototypes...
*/
extern int sgiClose (sgi_t *sgip);
extern int sgiGetRow (sgi_t *sgip,
unsigned short *row,
int y,
int z);
extern sgi_t *sgiOpen (const char *filename,
int mode,
int comp,
int bpp,
int xsize,
int ysize,
int zsize);
extern sgi_t *sgiOpenFile (FILE *file,
int mode,
int comp,
int bpp,
int xsize,
int ysize,
int zsize);
extern int sgiPutRow (sgi_t *sgip,
unsigned short *row,
int y,
int z);
G_END_DECLS
#endif /* !__SGI_LIB_H__ */
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