add i_gsamp_bg/i_gsampf_bg functions, sample based versions of
[imager.git] / pnm.c
CommitLineData
92bda632 1#include "imager.h"
02d1d628 2#include "log.h"
067d6bdc 3#include "iolayer.h"
92bda632 4#include "imageri.h"
02d1d628
AMH
5
6#include <stdlib.h>
f0e7b647 7#include <errno.h>
02d1d628
AMH
8
9
10/*
11=head1 NAME
12
13pnm.c - implements reading and writing ppm/pnm/pbm files, uses io layer.
14
15=head1 SYNOPSIS
16
17 io_glue *ig = io_new_fd( fd );
9c106321 18 i_img *im = i_readpnm_wiol(ig, 0); // no limit on how much is read
02d1d628
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19 // or
20 io_glue *ig = io_new_fd( fd );
21 return_code = i_writepnm_wiol(im, ig);
22
23=head1 DESCRIPTION
24
25pnm.c implements the basic functions to read and write portable
26anymap files. It uses the iolayer and needs either a seekable source
27or an entire memory mapped buffer.
28
29=head1 FUNCTION REFERENCE
30
31Some of these functions are internal.
32
b8c2033e 33=over
02d1d628
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34
35=cut
36*/
37
38
39#define BSIZ 1024
40#define misspace(x) (x==' ' || x=='\n' || x=='\r' || x=='\t' || x=='\f' || x=='\v')
41#define misnumber(x) (x <= '9' && x>='0')
42
43static char *typenames[]={"ascii pbm", "ascii pgm", "ascii ppm", "binary pbm", "binary pgm", "binary ppm"};
44
45/*
46 * Type to encapsulate the local buffer
47 * management skipping over in a file
48 */
49
50typedef struct {
51 io_glue *ig;
52 int len;
53 int cp;
54 char buf[BSIZ];
55} mbuf;
56
57
58static
59void init_buf(mbuf *mb, io_glue *ig) {
60 mb->len = 0;
61 mb->cp = 0;
62 mb->ig = ig;
63}
64
65
66
67/*
68=item gnext(mbuf *mb)
69
70Fetches a character and advances in stream by one character.
71Returns a pointer to the byte or NULL on failure (internal).
72
73 mb - buffer object
74
75=cut
76*/
77
9c106321
TC
78#define gnext(mb) (((mb)->cp == (mb)->len) ? gnextf(mb) : (mb)->buf + (mb)->cp++)
79
02d1d628
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80static
81char *
9c106321 82gnextf(mbuf *mb) {
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83 io_glue *ig = mb->ig;
84 if (mb->cp == mb->len) {
85 mb->cp = 0;
86 mb->len = ig->readcb(ig, mb->buf, BSIZ);
87 if (mb->len == -1) {
fac8664e 88 i_push_error(errno, "file read error");
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89 mm_log((1, "i_readpnm: read error\n"));
90 return NULL;
91 }
92 if (mb->len == 0) {
93 mm_log((1, "i_readpnm: end of file\n"));
94 return NULL;
95 }
96 }
97 return &mb->buf[mb->cp++];
98}
99
100
101/*
fdd00d54 102=item gpeek(mbuf *mb)
02d1d628
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103
104Fetches a character but does NOT advance. Returns a pointer to
105the byte or NULL on failure (internal).
106
107 mb - buffer object
108
109=cut
110*/
111
9c106321
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112#define gpeek(mb) ((mb)->cp == (mb)->len ? gpeekf(mb) : (mb)->buf + (mb)->cp)
113
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114static
115char *
9c106321 116gpeekf(mbuf *mb) {
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117 io_glue *ig = mb->ig;
118 if (mb->cp == mb->len) {
119 mb->cp = 0;
120 mb->len = ig->readcb(ig, mb->buf, BSIZ);
121 if (mb->len == -1) {
fac8664e 122 i_push_error(errno, "read error");
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123 mm_log((1, "i_readpnm: read error\n"));
124 return NULL;
125 }
126 if (mb->len == 0) {
127 mm_log((1, "i_readpnm: end of file\n"));
128 return NULL;
129 }
130 }
131 return &mb->buf[mb->cp];
132}
133
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TC
134int
135gread(mbuf *mb, unsigned char *buf, size_t read_size) {
136 int total_read = 0;
137 if (mb->cp != mb->len) {
138 int avail_size = mb->len - mb->cp;
139 int use_size = read_size > avail_size ? avail_size : read_size;
140 memcpy(buf, mb->buf+mb->cp, use_size);
141 mb->cp += use_size;
142 total_read += use_size;
143 read_size -= use_size;
144 buf += use_size;
145 }
146 if (read_size) {
147 io_glue *ig = mb->ig;
148 int read_res = i_io_read(ig, buf, read_size);
149 if (read_res >= 0) {
150 total_read += read_res;
151 }
152 }
153 return total_read;
154}
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155
156
157/*
158=item skip_spaces(mb)
159
160Advances in stream until it is positioned at a
161non white space character. (internal)
162
163 mb - buffer object
164
165=cut
166*/
167
168static
169int
170skip_spaces(mbuf *mb) {
171 char *cp;
172 while( (cp = gpeek(mb)) && misspace(*cp) ) if ( !gnext(mb) ) break;
173 if (!cp) return 0;
174 return 1;
175}
176
177
178/*
fdd00d54 179=item skip_comment(mb)
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180
181Advances in stream over whitespace and a comment if one is found. (internal)
182
183 mb - buffer object
184
185=cut
186*/
187
188static
189int
190skip_comment(mbuf *mb) {
191 char *cp;
192
193 if (!skip_spaces(mb)) return 0;
194
195 if (!(cp = gpeek(mb))) return 0;
196 if (*cp == '#') {
197 while( (cp = gpeek(mb)) && (*cp != '\n' && *cp != '\r') ) {
198 if ( !gnext(mb) ) break;
199 }
200 }
201 if (!cp) return 0;
202
203 return 1;
204}
205
206
207/*
208=item gnum(mb, i)
209
210Fetches the next number from stream and stores in i, returns true
211on success else false.
212
213 mb - buffer object
214 i - integer to store result in
215
216=cut
217*/
218
219static
220int
221gnum(mbuf *mb, int *i) {
222 char *cp;
223 *i = 0;
224
225 if (!skip_spaces(mb)) return 0;
226
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227 if (!(cp = gpeek(mb)))
228 return 0;
229 if (!misnumber(*cp))
230 return 0;
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231 while( (cp = gpeek(mb)) && misnumber(*cp) ) {
232 *i = *i*10+(*cp-'0');
233 cp = gnext(mb);
234 }
235 return 1;
236}
237
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TC
238static
239i_img *
240read_pgm_ppm_bin8(mbuf *mb, i_img *im, int width, int height,
d87dc9a4 241 int channels, int maxval, int allow_incomplete) {
9c106321
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242 i_color *line, *linep;
243 int read_size;
244 unsigned char *read_buf, *readp;
245 int x, y, ch;
246 int rounder = maxval / 2;
247
248 line = mymalloc(width * sizeof(i_color));
249 read_size = channels * width;
250 read_buf = mymalloc(read_size);
251 for(y=0;y<height;y++) {
252 linep = line;
253 readp = read_buf;
254 if (gread(mb, read_buf, read_size) != read_size) {
255 myfree(line);
256 myfree(read_buf);
d87dc9a4 257 if (allow_incomplete) {
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TC
258 i_tags_setn(&im->tags, "i_incomplete", 1);
259 i_tags_setn(&im->tags, "i_lines_read", y);
260 return im;
261 }
262 else {
263 i_push_error(0, "short read - file truncated?");
264 i_img_destroy(im);
265 return NULL;
266 }
267 }
268 if (maxval == 255) {
269 for(x=0; x<width; x++) {
270 for(ch=0; ch<channels; ch++) {
271 linep->channel[ch] = *readp++;
272 }
273 ++linep;
274 }
275 }
276 else {
277 for(x=0; x<width; x++) {
278 for(ch=0; ch<channels; ch++) {
279 /* we just clamp samples to the correct range */
280 unsigned sample = *readp++;
281 if (sample > maxval)
282 sample = maxval;
283 linep->channel[ch] = (sample * 255 + rounder) / maxval;
284 }
285 ++linep;
286 }
287 }
288 i_plin(im, 0, width, y, line);
289 }
290 myfree(read_buf);
291 myfree(line);
292
293 return im;
294}
295
296static
297i_img *
298read_pgm_ppm_bin16(mbuf *mb, i_img *im, int width, int height,
d87dc9a4 299 int channels, int maxval, int allow_incomplete) {
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300 i_fcolor *line, *linep;
301 int read_size;
302 unsigned char *read_buf, *readp;
303 int x, y, ch;
304 double maxvalf = maxval;
305
306 line = mymalloc(width * sizeof(i_fcolor));
307 read_size = channels * width * 2;
308 read_buf = mymalloc(read_size);
309 for(y=0;y<height;y++) {
310 linep = line;
311 readp = read_buf;
312 if (gread(mb, read_buf, read_size) != read_size) {
313 myfree(line);
314 myfree(read_buf);
d87dc9a4 315 if (allow_incomplete) {
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TC
316 i_tags_setn(&im->tags, "i_incomplete", 1);
317 i_tags_setn(&im->tags, "i_lines_read", y);
318 return im;
319 }
320 else {
321 i_push_error(0, "short read - file truncated?");
322 i_img_destroy(im);
323 return NULL;
324 }
325 }
326 for(x=0; x<width; x++) {
327 for(ch=0; ch<channels; ch++) {
328 unsigned sample = (readp[0] << 8) + readp[1];
329 if (sample > maxval)
330 sample = maxval;
331 readp += 2;
332 linep->channel[ch] = sample / maxvalf;
333 }
334 ++linep;
335 }
336 i_plinf(im, 0, width, y, line);
337 }
338 myfree(read_buf);
339 myfree(line);
340
341 return im;
342}
343
344static
345i_img *
d87dc9a4 346read_pbm_bin(mbuf *mb, i_img *im, int width, int height, int allow_incomplete) {
9c106321
TC
347 i_palidx *line, *linep;
348 int read_size;
349 unsigned char *read_buf, *readp;
350 int x, y;
351 unsigned mask;
352
353 line = mymalloc(width * sizeof(i_palidx));
354 read_size = (width + 7) / 8;
355 read_buf = mymalloc(read_size);
356 for(y = 0; y < height; y++) {
357 if (gread(mb, read_buf, read_size) != read_size) {
358 myfree(line);
359 myfree(read_buf);
d87dc9a4 360 if (allow_incomplete) {
9c106321
TC
361 i_tags_setn(&im->tags, "i_incomplete", 1);
362 i_tags_setn(&im->tags, "i_lines_read", y);
363 return im;
364 }
365 else {
366 i_push_error(0, "short read - file truncated?");
367 i_img_destroy(im);
368 return NULL;
369 }
370 }
371 linep = line;
372 readp = read_buf;
373 mask = 0x80;
374 for(x = 0; x < width; ++x) {
375 *linep++ = *readp & mask ? 1 : 0;
376 mask >>= 1;
377 if (mask == 0) {
378 ++readp;
379 mask = 0x80;
380 }
381 }
382 i_ppal(im, 0, width, y, line);
383 }
384 myfree(read_buf);
385 myfree(line);
386
387 return im;
388}
389
390/* unlike pgm/ppm pbm:
391 - doesn't require spaces between samples (bits)
392 - 1 (maxval) is black instead of white
393*/
394static
395i_img *
d87dc9a4 396read_pbm_ascii(mbuf *mb, i_img *im, int width, int height, int allow_incomplete) {
9c106321
TC
397 i_palidx *line, *linep;
398 int x, y;
399
400 line = mymalloc(width * sizeof(i_palidx));
401 for(y = 0; y < height; y++) {
402 linep = line;
403 for(x = 0; x < width; ++x) {
404 char *cp;
405 skip_spaces(mb);
406 if (!(cp = gnext(mb)) || (*cp != '0' && *cp != '1')) {
407 myfree(line);
d87dc9a4 408 if (allow_incomplete) {
9c106321
TC
409 i_tags_setn(&im->tags, "i_incomplete", 1);
410 i_tags_setn(&im->tags, "i_lines_read", y);
411 return im;
412 }
413 else {
414 if (cp)
415 i_push_error(0, "invalid data for ascii pnm");
416 else
417 i_push_error(0, "short read - file truncated?");
418 i_img_destroy(im);
419 return NULL;
420 }
421 }
422 *linep++ = *cp == '0' ? 0 : 1;
423 }
424 i_ppal(im, 0, width, y, line);
425 }
426 myfree(line);
427
428 return im;
429}
430
431static
432i_img *
433read_pgm_ppm_ascii(mbuf *mb, i_img *im, int width, int height, int channels,
d87dc9a4 434 int maxval, int allow_incomplete) {
9c106321
TC
435 i_color *line, *linep;
436 int x, y, ch;
437 int rounder = maxval / 2;
438
439 line = mymalloc(width * sizeof(i_color));
440 for(y=0;y<height;y++) {
441 linep = line;
442 for(x=0; x<width; x++) {
443 for(ch=0; ch<channels; ch++) {
444 int sample;
445
446 if (!gnum(mb, &sample)) {
447 myfree(line);
d87dc9a4 448 if (allow_incomplete) {
9c106321
TC
449 i_tags_setn(&im->tags, "i_incomplete", 1);
450 i_tags_setn(&im->tags, "i_lines_read", 1);
451 return im;
452 }
453 else {
454 if (gpeek(mb))
455 i_push_error(0, "invalid data for ascii pnm");
456 else
457 i_push_error(0, "short read - file truncated?");
458 i_img_destroy(im);
459 return NULL;
460 }
461 }
462 if (sample > maxval)
463 sample = maxval;
464 linep->channel[ch] = (sample * 255 + rounder) / maxval;
465 }
466 ++linep;
467 }
468 i_plin(im, 0, width, y, line);
469 }
470 myfree(line);
471
472 return im;
473}
474
475static
476i_img *
477read_pgm_ppm_ascii_16(mbuf *mb, i_img *im, int width, int height,
d87dc9a4 478 int channels, int maxval, int allow_incomplete) {
9c106321
TC
479 i_fcolor *line, *linep;
480 int x, y, ch;
481 double maxvalf = maxval;
482
483 line = mymalloc(width * sizeof(i_fcolor));
484 for(y=0;y<height;y++) {
485 linep = line;
486 for(x=0; x<width; x++) {
487 for(ch=0; ch<channels; ch++) {
488 int sample;
489
490 if (!gnum(mb, &sample)) {
491 myfree(line);
d87dc9a4
TC
492 if (allow_incomplete) {
493 i_tags_setn(&im->tags, "i_incomplete", 1);
494 i_tags_setn(&im->tags, "i_lines_read", y);
495 return im;
9c106321
TC
496 }
497 else {
498 if (gpeek(mb))
499 i_push_error(0, "invalid data for ascii pnm");
500 else
501 i_push_error(0, "short read - file truncated?");
502 i_img_destroy(im);
503 return NULL;
504 }
505 }
506 if (sample > maxval)
507 sample = maxval;
508 linep->channel[ch] = sample / maxvalf;
509 }
510 ++linep;
511 }
512 i_plinf(im, 0, width, y, line);
513 }
514 myfree(line);
515
516 return im;
517}
02d1d628
AMH
518
519/*
d87dc9a4 520=item i_readpnm_wiol(ig, allow_incomplete)
02d1d628
AMH
521
522Retrieve an image and stores in the iolayer object. Returns NULL on fatal error.
523
524 ig - io_glue object
d87dc9a4 525 allow_incomplete - allows a partial file to be read successfully
02d1d628
AMH
526
527=cut
528*/
529
530
531i_img *
d87dc9a4 532i_readpnm_wiol(io_glue *ig, int allow_incomplete) {
02d1d628
AMH
533 i_img* im;
534 int type;
02d1d628 535 int width, height, maxval, channels, pcount;
8b695554 536 int rounder;
02d1d628 537 char *cp;
02d1d628 538 mbuf buf;
02d1d628 539
fac8664e 540 i_clear_error();
d87dc9a4 541 mm_log((1,"i_readpnm(ig %p, allow_incomplete %d)\n", ig, allow_incomplete));
02d1d628 542
02d1d628
AMH
543 io_glue_commit_types(ig);
544 init_buf(&buf, ig);
545
546 cp = gnext(&buf);
547
548 if (!cp || *cp != 'P') {
fac8664e 549 i_push_error(0, "bad header magic, not a PNM file");
02d1d628
AMH
550 mm_log((1, "i_readpnm: Could not read header of file\n"));
551 return NULL;
552 }
553
554 if ( !(cp = gnext(&buf)) ) {
555 mm_log((1, "i_readpnm: Could not read header of file\n"));
556 return NULL;
557 }
558
559 type = *cp-'0';
560
561 if (type < 1 || type > 6) {
fac8664e 562 i_push_error(0, "unknown PNM file type, not a PNM file");
02d1d628
AMH
563 mm_log((1, "i_readpnm: Not a pnm file\n"));
564 return NULL;
565 }
566
567 if ( !(cp = gnext(&buf)) ) {
568 mm_log((1, "i_readpnm: Could not read header of file\n"));
569 return NULL;
570 }
571
572 if ( !misspace(*cp) ) {
fac8664e 573 i_push_error(0, "unexpected character, not a PNM file");
02d1d628
AMH
574 mm_log((1, "i_readpnm: Not a pnm file\n"));
575 return NULL;
576 }
577
578 mm_log((1, "i_readpnm: image is a %s\n", typenames[type-1] ));
579
580
581 /* Read sizes and such */
582
583 if (!skip_comment(&buf)) {
fac8664e 584 i_push_error(0, "while skipping to width");
02d1d628
AMH
585 mm_log((1, "i_readpnm: error reading before width\n"));
586 return NULL;
587 }
588
589 if (!gnum(&buf, &width)) {
fac8664e 590 i_push_error(0, "could not read image width");
02d1d628
AMH
591 mm_log((1, "i_readpnm: error reading width\n"));
592 return NULL;
593 }
594
595 if (!skip_comment(&buf)) {
fac8664e 596 i_push_error(0, "while skipping to height");
02d1d628
AMH
597 mm_log((1, "i_readpnm: error reading before height\n"));
598 return NULL;
599 }
600
601 if (!gnum(&buf, &height)) {
fac8664e 602 i_push_error(0, "could not read image height");
02d1d628
AMH
603 mm_log((1, "i_readpnm: error reading height\n"));
604 return NULL;
605 }
606
607 if (!(type == 1 || type == 4)) {
608 if (!skip_comment(&buf)) {
fac8664e 609 i_push_error(0, "while skipping to maxval");
02d1d628
AMH
610 mm_log((1, "i_readpnm: error reading before maxval\n"));
611 return NULL;
612 }
613
614 if (!gnum(&buf, &maxval)) {
fac8664e 615 i_push_error(0, "could not read maxval");
02d1d628
AMH
616 mm_log((1, "i_readpnm: error reading maxval\n"));
617 return NULL;
618 }
8b695554
TC
619
620 if (maxval == 0) {
621 i_push_error(0, "maxval is zero - invalid pnm file");
622 mm_log((1, "i_readpnm: maxval is zero, invalid pnm file\n"));
623 return NULL;
624 }
625 else if (maxval > 65535) {
626 i_push_errorf(0, "maxval of %d is over 65535 - invalid pnm file",
627 maxval);
628 mm_log((1, "i_readpnm: maxval of %d is over 65535 - invalid pnm file\n"));
629 return NULL;
630 }
02d1d628 631 } else maxval=1;
8b695554 632 rounder = maxval / 2;
02d1d628
AMH
633
634 if (!(cp = gnext(&buf)) || !misspace(*cp)) {
fac8664e 635 i_push_error(0, "garbage in header, invalid PNM file");
02d1d628
AMH
636 mm_log((1, "i_readpnm: garbage in header\n"));
637 return NULL;
638 }
639
640 channels = (type == 3 || type == 6) ? 3:1;
641 pcount = width*height*channels;
642
77157728
TC
643 if (!i_int_check_image_file_limits(width, height, channels, sizeof(i_sample_t))) {
644 mm_log((1, "i_readpnm: image size exceeds limits\n"));
645 return NULL;
646 }
647
02d1d628 648 mm_log((1, "i_readpnm: (%d x %d), channels = %d, maxval = %d\n", width, height, channels, maxval));
02d1d628 649
9c106321
TC
650 if (type == 1 || type == 4) {
651 i_color pbm_pal[2];
652 pbm_pal[0].channel[0] = 255;
653 pbm_pal[1].channel[0] = 0;
654
655 im = i_img_pal_new(width, height, 1, 256);
656 i_addcolors(im, pbm_pal, 2);
657 }
658 else {
659 if (maxval > 255)
660 im = i_img_16_new(width, height, channels);
661 else
662 im = i_img_8_new(width, height, channels);
663 }
642a675b 664
02d1d628
AMH
665 switch (type) {
666 case 1: /* Ascii types */
d87dc9a4 667 im = read_pbm_ascii(&buf, im, width, height, allow_incomplete);
9c106321
TC
668 break;
669
02d1d628
AMH
670 case 2:
671 case 3:
9c106321 672 if (maxval > 255)
d87dc9a4 673 im = read_pgm_ppm_ascii_16(&buf, im, width, height, channels, maxval, allow_incomplete);
9c106321 674 else
d87dc9a4 675 im = read_pgm_ppm_ascii(&buf, im, width, height, channels, maxval, allow_incomplete);
02d1d628
AMH
676 break;
677
678 case 4: /* binary pbm */
d87dc9a4 679 im = read_pbm_bin(&buf, im, width, height, allow_incomplete);
02d1d628
AMH
680 break;
681
682 case 5: /* binary pgm */
683 case 6: /* binary ppm */
9c106321 684 if (maxval > 255)
d87dc9a4 685 im = read_pgm_ppm_bin16(&buf, im, width, height, channels, maxval, allow_incomplete);
9c106321 686 else
d87dc9a4 687 im = read_pgm_ppm_bin8(&buf, im, width, height, channels, maxval, allow_incomplete);
02d1d628 688 break;
9c106321 689
02d1d628
AMH
690 default:
691 mm_log((1, "type %s [P%d] unsupported\n", typenames[type-1], type));
692 return NULL;
693 }
9c106321
TC
694
695 if (!im)
696 return NULL;
697
698 i_tags_add(&im->tags, "i_format", 0, "pnm", -1, 0);
699 i_tags_setn(&im->tags, "pnm_maxval", maxval);
700 i_tags_setn(&im->tags, "pnm_type", type);
701
02d1d628
AMH
702 return im;
703}
704
9c106321
TC
705static
706int
707write_pbm(i_img *im, io_glue *ig, int zero_is_white) {
708 int x, y;
709 i_palidx *line;
710 int write_size;
711 unsigned char *write_buf;
712 unsigned char *writep;
713 char header[255];
714 unsigned mask;
715
716 sprintf(header, "P4\012# CREATOR: Imager\012%d %d\012",
717 im->xsize, im->ysize);
718 if (i_io_write(ig, header, strlen(header)) < 0) {
719 i_push_error(0, "could not write pbm header");
720 return 0;
721 }
722 write_size = (im->xsize + 7) / 8;
723 line = mymalloc(sizeof(i_palidx) * im->xsize);
724 write_buf = mymalloc(write_size);
725 for (y = 0; y < im->ysize; ++y) {
726 i_gpal(im, 0, im->xsize, y, line);
727 mask = 0x80;
728 writep = write_buf;
729 memset(write_buf, 0, write_size);
730 for (x = 0; x < im->xsize; ++x) {
731 if (zero_is_white ? line[x] : !line[x])
732 *writep |= mask;
733 mask >>= 1;
734 if (!mask) {
735 ++writep;
736 mask = 0x80;
737 }
738 }
739 if (i_io_write(ig, write_buf, write_size) != write_size) {
740 i_push_error(0, "write failure");
741 myfree(write_buf);
742 myfree(line);
743 return 0;
744 }
745 }
746 myfree(write_buf);
747 myfree(line);
748
749 return 1;
750}
751
752static
753int
fa90de94
TC
754write_ppm_data_8(i_img *im, io_glue *ig, int want_channels) {
755 int write_size = im->xsize * want_channels;
2a31a4b4
TC
756 int buf_size = im->xsize * im->channels;
757 unsigned char *data = mymalloc(buf_size);
9c106321
TC
758 int y = 0;
759 int rc = 1;
fa90de94 760 i_color bg;
9c106321 761
fa90de94 762 i_get_file_background(im, &bg);
9c106321 763 while (y < im->ysize && rc >= 0) {
2a31a4b4 764 i_gsamp_bg(im, 0, im->xsize, y, data, want_channels, &bg);
9c106321
TC
765 if (i_io_write(ig, data, write_size) != write_size) {
766 i_push_error(errno, "could not write ppm data");
767 rc = 0;
768 break;
769 }
770 ++y;
771 }
772 myfree(data);
773
774 return rc;
775}
776
777static
778int
fa90de94 779write_ppm_data_16(i_img *im, io_glue *ig, int want_channels) {
2a31a4b4 780 int line_size = im->channels * im->xsize * sizeof(i_fsample_t);
fa90de94 781 int sample_count = want_channels * im->xsize;
9c106321 782 int write_size = sample_count * 2;
2a31a4b4
TC
783 i_fsample_t *line_buf = mymalloc(line_size);
784 i_fsample_t *samplep;
9c106321 785 unsigned char *write_buf = mymalloc(write_size);
2a31a4b4
TC
786 unsigned char *writep;
787 int sample_num;
9c106321 788 int y = 0;
fa90de94 789 int x, ch;
9c106321 790 int rc = 1;
fa90de94
TC
791 i_fcolor bg;
792
793 i_get_file_backgroundf(im, &bg);
9c106321
TC
794
795 while (y < im->ysize) {
2a31a4b4
TC
796 i_gsampf_bg(im, 0, im->xsize, y, line_buf, want_channels, &bg);
797 samplep = line_buf;
798 writep = write_buf;
799 for (sample_num = 0; sample_num < sample_count; ++sample_num) {
800 unsigned sample16 = SampleFTo16(*samplep++);
801 *writep++ = sample16 >> 8;
802 *writep++ = sample16 & 0xFF;
9c106321
TC
803 }
804 if (i_io_write(ig, write_buf, write_size) != write_size) {
805 i_push_error(errno, "could not write ppm data");
806 rc = 0;
807 break;
808 }
809 ++y;
810 }
811 myfree(line_buf);
812 myfree(write_buf);
813
814 return rc;
815}
02d1d628 816
067d6bdc
AMH
817undef_int
818i_writeppm_wiol(i_img *im, io_glue *ig) {
819 char header[255];
9c106321
TC
820 int zero_is_white;
821 int wide_data;
02d1d628 822
067d6bdc
AMH
823 mm_log((1,"i_writeppm(im %p, ig %p)\n", im, ig));
824 i_clear_error();
02d1d628 825
067d6bdc
AMH
826 /* Add code to get the filename info from the iolayer */
827 /* Also add code to check for mmapped code */
02d1d628 828
067d6bdc 829 io_glue_commit_types(ig);
02d1d628 830
9c106321
TC
831 if (i_img_is_monochrome(im, &zero_is_white)) {
832 return write_pbm(im, ig, zero_is_white);
833 }
834 else {
835 int type;
836 int maxval;
fa90de94
TC
837 int want_channels = im->channels;
838
839 if (want_channels == 2 || want_channels == 4)
840 --want_channels;
faa9b3e7 841
9c106321
TC
842 if (!i_tags_get_int(&im->tags, "pnm_write_wide_data", 0, &wide_data))
843 wide_data = 0;
844
fa90de94 845 if (want_channels == 3) {
9c106321 846 type = 6;
faa9b3e7 847 }
fa90de94 848 else if (want_channels == 1) {
9c106321 849 type = 5;
faa9b3e7 850 }
9c106321
TC
851 else {
852 i_push_error(0, "can only save 1 or 3 channel images to pnm");
853 mm_log((1,"i_writeppm: ppm/pgm is 1 or 3 channel only (current image is %d)\n",im->channels));
067d6bdc
AMH
854 return(0);
855 }
9c106321
TC
856 if (im->bits <= 8 || !wide_data)
857 maxval = 255;
858 else
859 maxval = 65535;
860
861 sprintf(header,"P%d\n#CREATOR: Imager\n%d %d\n%d\n",
862 type, im->xsize, im->ysize, maxval);
863
864 if (ig->writecb(ig,header,strlen(header)) != strlen(header)) {
865 i_push_error(errno, "could not write ppm header");
866 mm_log((1,"i_writeppm: unable to write ppm header.\n"));
067d6bdc
AMH
867 return(0);
868 }
faa9b3e7 869
fa90de94
TC
870 if (!im->virtual && im->bits == i_8_bits && im->type == i_direct_type
871 && im->channels == want_channels) {
9c106321
TC
872 if (ig->writecb(ig,im->idata,im->bytes) != im->bytes) {
873 i_push_error(errno, "could not write ppm data");
faa9b3e7
TC
874 return 0;
875 }
876 }
9c106321 877 else if (maxval == 255) {
fa90de94 878 if (!write_ppm_data_8(im, ig, want_channels))
9c106321
TC
879 return 0;
880 }
881 else {
fa90de94 882 if (!write_ppm_data_16(im, ig, want_channels))
9c106321 883 return 0;
067d6bdc 884 }
067d6bdc 885 }
10461f9a 886 ig->closecb(ig);
faa9b3e7 887
067d6bdc
AMH
888 return(1);
889}
b8c2033e
AMH
890
891/*
892=back
893
894=head1 AUTHOR
895
9c106321 896Arnar M. Hrafnkelsson <addi@umich.edu>, Tony Cook<tony@imager.perl.org>
b8c2033e
AMH
897
898=head1 SEE ALSO
899
900Imager(3)
901
902=cut
903*/