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