]>
git.ipfire.org Git - thirdparty/cups.git/blob - filter/image-sgilib.c
2 * "$Id: image-sgilib.c 7221 2008-01-16 22:20:08Z mike $"
4 * SGI image file format library routines for CUPS.
6 * Copyright 2007-2011 by Apple Inc.
7 * Copyright 1993-2005 by Easy Software Products.
9 * These coded instructions, statements, and computer programs are the
10 * property of Apple Inc. and are protected by Federal copyright
11 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
12 * which should have been included with this file. If this file is
13 * file is missing or damaged, see the license at "http://www.cups.org/".
15 * This file is subject to the Apple OS-Developed Software exception.
19 * sgiClose() - Close an SGI image file.
20 * sgiGetRow() - Get a row of image data from a file.
21 * sgiOpen() - Open an SGI image file for reading or writing.
22 * sgiOpenFile() - Open an SGI image file for reading or writing.
23 * sgiPutRow() - Put a row of image data to a file.
24 * getlong() - Get a 32-bit big-endian integer.
25 * getshort() - Get a 16-bit big-endian integer.
26 * putlong() - Put a 32-bit big-endian integer.
27 * putshort() - Put a 16-bit big-endian integer.
28 * read_rle8() - Read 8-bit RLE data.
29 * read_rle16() - Read 16-bit RLE data.
30 * write_rle8() - Write 8-bit RLE data.
31 * write_rle16() - Write 16-bit RLE data.
34 #include "image-sgi.h"
41 static int getlong(FILE *);
42 static int getshort(FILE *);
43 static int putlong(long, FILE *);
44 static int putshort(unsigned short, FILE *);
45 static int read_rle8(FILE *, unsigned short *, int);
46 static int read_rle16(FILE *, unsigned short *, int);
47 static int write_rle8(FILE *, unsigned short *, int);
48 static int write_rle16(FILE *, unsigned short *, int);
52 * 'sgiClose()' - Close an SGI image file.
55 int /* O - 0 on success, -1 on error */
56 sgiClose(sgi_t
*sgip
) /* I - SGI image */
58 int i
; /* Return status */
59 long *offset
; /* Looping var for offset table */
65 if (sgip
->mode
== SGI_WRITE
&& sgip
->comp
!= SGI_COMP_NONE
)
68 * Write the scanline offset table to the file...
71 fseek(sgip
->file
, 512, SEEK_SET
);
73 for (i
= sgip
->ysize
* sgip
->zsize
, offset
= sgip
->table
[0];
76 if (putlong(offset
[0], sgip
->file
) < 0)
79 for (i
= sgip
->ysize
* sgip
->zsize
, offset
= sgip
->length
[0];
82 if (putlong(offset
[0], sgip
->file
) < 0)
86 if (sgip
->table
!= NULL
)
92 if (sgip
->length
!= NULL
)
94 free(sgip
->length
[0]);
98 if (sgip
->comp
== SGI_COMP_ARLE
)
101 i
= fclose(sgip
->file
);
109 * 'sgiGetRow()' - Get a row of image data from a file.
112 int /* O - 0 on success, -1 on error */
113 sgiGetRow(sgi_t
*sgip
, /* I - SGI image */
114 unsigned short *row
, /* O - Row to read */
115 int y
, /* I - Line to read */
116 int z
) /* I - Channel to read */
118 int x
; /* X coordinate */
119 long offset
; /* File offset */
124 y
< 0 || y
>= sgip
->ysize
||
125 z
< 0 || z
>= sgip
->zsize
)
132 * Seek to the image row - optimize buffering by only seeking if
136 offset
= 512 + (y
+ z
* sgip
->ysize
) * sgip
->xsize
* sgip
->bpp
;
137 if (offset
!= ftell(sgip
->file
))
138 fseek(sgip
->file
, offset
, SEEK_SET
);
142 for (x
= sgip
->xsize
; x
> 0; x
--, row
++)
143 *row
= getc(sgip
->file
);
147 for (x
= sgip
->xsize
; x
> 0; x
--, row
++)
148 *row
= getshort(sgip
->file
);
153 offset
= sgip
->table
[z
][y
];
154 if (offset
!= ftell(sgip
->file
))
155 fseek(sgip
->file
, offset
, SEEK_SET
);
158 return (read_rle8(sgip
->file
, row
, sgip
->xsize
));
160 return (read_rle16(sgip
->file
, row
, sgip
->xsize
));
168 * 'sgiOpen()' - Open an SGI image file for reading or writing.
171 sgi_t
* /* O - New image */
172 sgiOpen(const char *filename
, /* I - File to open */
173 int mode
, /* I - Open mode (SGI_READ or SGI_WRITE) */
174 int comp
, /* I - Type of compression */
175 int bpp
, /* I - Bytes per pixel */
176 int xsize
, /* I - Width of image in pixels */
177 int ysize
, /* I - Height of image in pixels */
178 int zsize
) /* I - Number of channels */
180 sgi_t
*sgip
; /* New SGI image file */
181 FILE *file
; /* Image file pointer */
184 if (mode
== SGI_READ
)
185 file
= fopen(filename
, "rb");
187 file
= fopen(filename
, "wb+");
192 if ((sgip
= sgiOpenFile(file
, mode
, comp
, bpp
, xsize
, ysize
, zsize
)) == NULL
)
200 * 'sgiOpenFile()' - Open an SGI image file for reading or writing.
203 sgi_t
* /* O - New image */
204 sgiOpenFile(FILE *file
, /* I - File to open */
205 int mode
, /* I - Open mode (SGI_READ or SGI_WRITE) */
206 int comp
, /* I - Type of compression */
207 int bpp
, /* I - Bytes per pixel */
208 int xsize
, /* I - Width of image in pixels */
209 int ysize
, /* I - Height of image in pixels */
210 int zsize
) /* I - Number of channels */
212 int i
, j
; /* Looping var */
213 char name
[80]; /* Name of file in image header */
214 short magic
; /* Magic number */
215 sgi_t
*sgip
; /* New image pointer */
218 if ((sgip
= calloc(sizeof(sgi_t
), 1)) == NULL
)
226 sgip
->mode
= SGI_READ
;
228 magic
= getshort(sgip
->file
);
229 if (magic
!= SGI_MAGIC
)
235 sgip
->comp
= getc(sgip
->file
);
236 sgip
->bpp
= getc(sgip
->file
);
237 getshort(sgip
->file
); /* Dimensions */
238 sgip
->xsize
= getshort(sgip
->file
);
239 sgip
->ysize
= getshort(sgip
->file
);
240 sgip
->zsize
= getshort(sgip
->file
);
241 getlong(sgip
->file
); /* Minimum pixel */
242 getlong(sgip
->file
); /* Maximum pixel */
247 * This file is compressed; read the scanline tables...
250 fseek(sgip
->file
, 512, SEEK_SET
);
252 if ((sgip
->table
= calloc(sgip
->zsize
, sizeof(long *))) == NULL
)
258 if ((sgip
->table
[0] = calloc(sgip
->ysize
* sgip
->zsize
,
259 sizeof(long))) == NULL
)
266 for (i
= 1; i
< sgip
->zsize
; i
++)
267 sgip
->table
[i
] = sgip
->table
[0] + i
* sgip
->ysize
;
269 for (i
= 0; i
< sgip
->zsize
; i
++)
270 for (j
= 0; j
< sgip
->ysize
; j
++)
271 sgip
->table
[i
][j
] = getlong(sgip
->file
);
279 bpp
< 1 || bpp
> 2 ||
280 comp
< SGI_COMP_NONE
|| comp
> SGI_COMP_ARLE
)
286 sgip
->mode
= SGI_WRITE
;
288 putshort(SGI_MAGIC
, sgip
->file
);
289 putc((sgip
->comp
= comp
) != 0, sgip
->file
);
290 putc(sgip
->bpp
= bpp
, sgip
->file
);
291 putshort(3, sgip
->file
); /* Dimensions */
292 putshort(sgip
->xsize
= xsize
, sgip
->file
);
293 putshort(sgip
->ysize
= ysize
, sgip
->file
);
294 putshort(sgip
->zsize
= zsize
, sgip
->file
);
297 putlong(0, sgip
->file
); /* Minimum pixel */
298 putlong(255, sgip
->file
); /* Maximum pixel */
302 putlong(-32768, sgip
->file
); /* Minimum pixel */
303 putlong(32767, sgip
->file
); /* Maximum pixel */
305 putlong(0, sgip
->file
); /* Reserved */
307 memset(name
, 0, sizeof(name
));
308 fwrite(name
, sizeof(name
), 1, sgip
->file
);
310 for (i
= 0; i
< 102; i
++)
311 putlong(0, sgip
->file
);
315 case SGI_COMP_NONE
: /* No compression */
317 * This file is uncompressed. To avoid problems with sparse files,
318 * we need to write blank pixels for the entire image...
323 for (i
= xsize
* ysize
* zsize
; i
> 0; i
--)
328 for (i
= xsize
* ysize
* zsize
; i
> 0; i
--)
329 putshort(0, sgip
->file
);
333 case SGI_COMP_ARLE
: /* Aggressive RLE */
334 sgip
->arle_row
= calloc(xsize
, sizeof(unsigned short));
335 sgip
->arle_offset
= 0;
337 case SGI_COMP_RLE
: /* Run-Length Encoding */
339 * This file is compressed; write the (blank) scanline tables...
342 for (i
= 2 * ysize
* zsize
; i
> 0; i
--)
343 putlong(0, sgip
->file
);
345 sgip
->firstrow
= ftell(sgip
->file
);
346 sgip
->nextrow
= ftell(sgip
->file
);
347 if ((sgip
->table
= calloc(sgip
->zsize
, sizeof(long *))) == NULL
)
353 if ((sgip
->table
[0] = calloc(sgip
->ysize
* sgip
->zsize
,
354 sizeof(long))) == NULL
)
361 for (i
= 1; i
< sgip
->zsize
; i
++)
362 sgip
->table
[i
] = sgip
->table
[0] + i
* sgip
->ysize
;
364 if ((sgip
->length
= calloc(sgip
->zsize
, sizeof(long *))) == NULL
)
371 if ((sgip
->length
[0] = calloc(sgip
->ysize
* sgip
->zsize
,
372 sizeof(long))) == NULL
)
380 for (i
= 1; i
< sgip
->zsize
; i
++)
381 sgip
->length
[i
] = sgip
->length
[0] + i
* sgip
->ysize
;
396 * 'sgiPutRow()' - Put a row of image data to a file.
399 int /* O - 0 on success, -1 on error */
400 sgiPutRow(sgi_t
*sgip
, /* I - SGI image */
401 unsigned short *row
, /* I - Row to write */
402 int y
, /* I - Line to write */
403 int z
) /* I - Channel to write */
405 int x
; /* X coordinate */
406 long offset
; /* File offset */
411 y
< 0 || y
>= sgip
->ysize
||
412 z
< 0 || z
>= sgip
->zsize
)
419 * Seek to the image row - optimize buffering by only seeking if
423 offset
= 512 + (y
+ z
* sgip
->ysize
) * sgip
->xsize
* sgip
->bpp
;
424 if (offset
!= ftell(sgip
->file
))
425 fseek(sgip
->file
, offset
, SEEK_SET
);
429 for (x
= sgip
->xsize
; x
> 0; x
--, row
++)
430 putc(*row
, sgip
->file
);
434 for (x
= sgip
->xsize
; x
> 0; x
--, row
++)
435 putshort(*row
, sgip
->file
);
440 if (sgip
->table
[z
][y
] != 0)
444 * First check the last row written...
447 if (sgip
->arle_offset
> 0)
449 for (x
= 0; x
< sgip
->xsize
; x
++)
450 if (row
[x
] != sgip
->arle_row
[x
])
453 if (x
== sgip
->xsize
)
455 sgip
->table
[z
][y
] = sgip
->arle_offset
;
456 sgip
->length
[z
][y
] = sgip
->arle_length
;
462 * If that didn't match, search all the previous rows...
465 fseek(sgip
->file
, sgip
->firstrow
, SEEK_SET
);
471 sgip
->arle_offset
= ftell(sgip
->file
);
472 if ((sgip
->arle_length
= read_rle8(sgip
->file
, sgip
->arle_row
, sgip
->xsize
)) < 0)
478 if (memcmp(row
, sgip
->arle_row
, sgip
->xsize
* sizeof(unsigned short)) == 0)
489 sgip
->arle_offset
= ftell(sgip
->file
);
490 if ((sgip
->arle_length
= read_rle16(sgip
->file
, sgip
->arle_row
, sgip
->xsize
)) < 0)
496 if (memcmp(row
, sgip
->arle_row
, sgip
->xsize
* sizeof(unsigned short)) == 0)
504 if (x
== sgip
->xsize
)
506 sgip
->table
[z
][y
] = sgip
->arle_offset
;
507 sgip
->length
[z
][y
] = sgip
->arle_length
;
511 fseek(sgip
->file
, 0, SEEK_END
); /* Clear EOF */
514 if (sgip
->table
[z
][y
] != 0)
517 offset
= sgip
->table
[z
][y
] = sgip
->nextrow
;
519 if (offset
!= ftell(sgip
->file
))
520 fseek(sgip
->file
, offset
, SEEK_SET
);
523 x
= write_rle8(sgip
->file
, row
, sgip
->xsize
);
525 x
= write_rle16(sgip
->file
, row
, sgip
->xsize
);
527 if (sgip
->comp
== SGI_COMP_ARLE
)
529 sgip
->arle_offset
= offset
;
530 sgip
->arle_length
= x
;
531 memcpy(sgip
->arle_row
, row
, sgip
->xsize
* sizeof(unsigned short));
534 sgip
->nextrow
= ftell(sgip
->file
);
535 sgip
->length
[z
][y
] = x
;
545 * 'getlong()' - Get a 32-bit big-endian integer.
548 static int /* O - Long value */
549 getlong(FILE *fp
) /* I - File to read from */
551 unsigned char b
[4]; /* Bytes from file */
555 return ((b
[0] << 24) | (b
[1] << 16) | (b
[2] << 8) | b
[3]);
560 * 'getshort()' - Get a 16-bit big-endian integer.
563 static int /* O - Short value */
564 getshort(FILE *fp
) /* I - File to read from */
566 unsigned char b
[2]; /* Bytes from file */
570 return ((b
[0] << 8) | b
[1]);
575 * 'putlong()' - Put a 32-bit big-endian integer.
578 static int /* O - 0 on success, -1 on error */
579 putlong(long n
, /* I - Long to write */
580 FILE *fp
) /* I - File to write to */
582 if (putc(n
>> 24, fp
) == EOF
)
584 if (putc(n
>> 16, fp
) == EOF
)
586 if (putc(n
>> 8, fp
) == EOF
)
588 if (putc(n
, fp
) == EOF
)
596 * 'putshort()' - Put a 16-bit big-endian integer.
599 static int /* O - 0 on success, -1 on error */
600 putshort(unsigned short n
, /* I - Short to write */
601 FILE *fp
) /* I - File to write to */
603 if (putc(n
>> 8, fp
) == EOF
)
605 if (putc(n
, fp
) == EOF
)
613 * 'read_rle8()' - Read 8-bit RLE data.
616 static int /* O - Value on success, -1 on error */
617 read_rle8(FILE *fp
, /* I - File to read from */
618 unsigned short *row
, /* O - Data */
619 int xsize
) /* I - Width of data in pixels */
621 int i
, /* Looping var */
622 ch
, /* Current character */
623 count
, /* RLE count */
624 length
; /* Number of bytes read... */
631 if ((ch
= getc(fp
)) == EOF
)
641 for (i
= 0; i
< count
; i
++, row
++, xsize
--, length
++)
649 for (i
= 0; i
< count
&& xsize
> 0; i
++, row
++, xsize
--)
654 return (xsize
> 0 ? -1 : length
);
659 * 'read_rle16()' - Read 16-bit RLE data.
662 static int /* O - Value on success, -1 on error */
663 read_rle16(FILE *fp
, /* I - File to read from */
664 unsigned short *row
, /* O - Data */
665 int xsize
) /* I - Width of data in pixels */
667 int i
, /* Looping var */
668 ch
, /* Current character */
669 count
, /* RLE count */
670 length
; /* Number of bytes read... */
677 if ((ch
= getshort(fp
)) == EOF
)
687 for (i
= 0; i
< count
; i
++, row
++, xsize
--, length
++)
695 for (i
= 0; i
< count
&& xsize
> 0; i
++, row
++, xsize
--)
700 return (xsize
> 0 ? -1 : length
* 2);
705 * 'write_rle8()' - Write 8-bit RLE data.
708 static int /* O - Length on success, -1 on error */
709 write_rle8(FILE *fp
, /* I - File to write to */
710 unsigned short *row
, /* I - Data */
711 int xsize
) /* I - Width of data in pixels */
713 int length
, /* Length in bytes */
714 count
, /* Number of repeating pixels */
716 x
; /* Current column */
717 unsigned short *start
, /* Start of current sequence */
718 repeat
; /* Repeated pixel */
721 for (x
= xsize
, length
= 0; x
> 0;)
727 while (x
> 0 && (row
[-2] != row
[-1] || row
[-1] != row
[0]))
739 i
= count
> 126 ? 126 : count
;
742 if (putc(128 | i
, fp
) == EOF
)
748 if (putc(*start
, fp
) == EOF
)
765 while (x
> 0 && *row
== repeat
)
774 i
= count
> 126 ? 126 : count
;
777 if (putc(i
, fp
) == EOF
)
781 if (putc(repeat
, fp
) == EOF
)
789 if (putc(0, fp
) == EOF
)
797 * 'write_rle16()' - Write 16-bit RLE data.
800 static int /* O - Length in words */
801 write_rle16(FILE *fp
, /* I - File to write to */
802 unsigned short *row
, /* I - Data */
803 int xsize
) /* I - Width of data in pixels */
805 int length
, /* Length in words */
806 count
, /* Number of repeating pixels */
808 x
; /* Current column */
809 unsigned short *start
, /* Start of current sequence */
810 repeat
; /* Repeated pixel */
813 for (x
= xsize
, length
= 0; x
> 0;)
819 while (x
> 0 && (row
[-2] != row
[-1] || row
[-1] != row
[0]))
831 i
= count
> 126 ? 126 : count
;
834 if (putshort(128 | i
, fp
) == EOF
)
840 if (putshort(*start
, fp
) == EOF
)
857 while (x
> 0 && *row
== repeat
)
866 i
= count
> 126 ? 126 : count
;
869 if (putshort(i
, fp
) == EOF
)
873 if (putshort(repeat
, fp
) == EOF
)
881 if (putshort(0, fp
) == EOF
)
889 * End of "$Id: image-sgilib.c 7221 2008-01-16 22:20:08Z mike $".