src/third-party/libpng/contrib/pngminus/pnm2png.c (view raw)
1/*
2 * pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
3 * copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
4 *
5 * version 1.0 - 1999.10.15 - First version.
6 *
7 * Permission to use, copy, modify, and distribute this software and
8 * its documentation for any purpose and without fee is hereby granted,
9 * provided that the above copyright notice appear in all copies and
10 * that both that copyright notice and this permission notice appear in
11 * supporting documentation. This software is provided "as is" without
12 * express or implied warranty.
13 */
14
15#include <stdio.h>
16#include <stdlib.h>
17#ifdef __TURBOC__
18#include <mem.h>
19#include <fcntl.h>
20#endif
21#include <zlib.h>
22
23#ifndef BOOL
24#define BOOL unsigned char
25#endif
26#ifndef TRUE
27#define TRUE (BOOL) 1
28#endif
29#ifndef FALSE
30#define FALSE (BOOL) 0
31#endif
32
33#define STDIN 0
34#define STDOUT 1
35#define STDERR 2
36
37/* to make pnm2png verbose so we can find problems (needs to be before png.h) */
38#ifndef PNG_DEBUG
39#define PNG_DEBUG 0
40#endif
41
42#include "png.h"
43
44/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
45#ifndef png_jmpbuf
46# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
47#endif
48
49/* function prototypes */
50
51int main (int argc, char *argv[]);
52void usage ();
53BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
54 BOOL alpha);
55void get_token(FILE *pnm_file, char *token);
56png_uint_32 get_data (FILE *pnm_file, int depth);
57png_uint_32 get_value (FILE *pnm_file, int depth);
58
59/*
60 * main
61 */
62
63int main(int argc, char *argv[])
64{
65 FILE *fp_rd = stdin;
66 FILE *fp_al = NULL;
67 FILE *fp_wr = stdout;
68 BOOL interlace = FALSE;
69 BOOL alpha = FALSE;
70 int argi;
71
72 for (argi = 1; argi < argc; argi++)
73 {
74 if (argv[argi][0] == '-')
75 {
76 switch (argv[argi][1])
77 {
78 case 'i':
79 interlace = TRUE;
80 break;
81 case 'a':
82 alpha = TRUE;
83 argi++;
84 if ((fp_al = fopen (argv[argi], "rb")) == NULL)
85 {
86 fprintf (stderr, "PNM2PNG\n");
87 fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
88 argv[argi]);
89 exit (1);
90 }
91 break;
92 case 'h':
93 case '?':
94 usage();
95 exit(0);
96 break;
97 default:
98 fprintf (stderr, "PNM2PNG\n");
99 fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
100 usage();
101 exit(1);
102 break;
103 } /* end switch */
104 }
105 else if (fp_rd == stdin)
106 {
107 if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
108 {
109 fprintf (stderr, "PNM2PNG\n");
110 fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
111 exit (1);
112 }
113 }
114 else if (fp_wr == stdout)
115 {
116 if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
117 {
118 fprintf (stderr, "PNM2PNG\n");
119 fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
120 exit (1);
121 }
122 }
123 else
124 {
125 fprintf (stderr, "PNM2PNG\n");
126 fprintf (stderr, "Error: too many parameters\n");
127 usage();
128 exit (1);
129 }
130 } /* end for */
131
132#ifdef __TURBOC__
133 /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
134 if (fp_rd == stdin)
135 {
136 setmode (STDIN, O_BINARY);
137 }
138 if (fp_wr == stdout)
139 {
140 setmode (STDOUT, O_BINARY);
141 }
142#endif
143
144 /* call the conversion program itself */
145 if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
146 {
147 fprintf (stderr, "PNM2PNG\n");
148 fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
149 exit (1);
150 }
151
152 /* close input file */
153 fclose (fp_rd);
154 /* close output file */
155 fclose (fp_wr);
156 /* close alpha file */
157 if (alpha)
158 fclose (fp_al);
159
160 return 0;
161}
162
163/*
164 * usage
165 */
166
167void usage()
168{
169 fprintf (stderr, "PNM2PNG\n");
170 fprintf (stderr, " by Willem van Schaik, 1999\n");
171#ifdef __TURBOC__
172 fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
173#else
174 fprintf (stderr, " for Linux (and Unix) compilers\n");
175#endif
176 fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
177 fprintf (stderr, " or: ... | pnm2png [options]\n");
178 fprintf (stderr, "Options:\n");
179 fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
180 fprintf (stderr,
181 " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
182 fprintf (stderr, " -h | -? print this help-information\n");
183}
184
185/*
186 * pnm2png
187 */
188
189BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace,
190 BOOL alpha)
191{
192 png_struct *png_ptr = NULL;
193 png_info *info_ptr = NULL;
194 png_byte *png_pixels = NULL;
195 png_byte **row_pointers = NULL;
196 png_byte *pix_ptr = NULL;
197 volatile png_uint_32 row_bytes;
198
199 char type_token[16];
200 char width_token[16];
201 char height_token[16];
202 char maxval_token[16];
203 volatile int color_type;
204 unsigned long ul_width=0, ul_alpha_width=0;
205 unsigned long ul_height=0, ul_alpha_height=0;
206 unsigned long ul_maxval=0;
207 volatile png_uint_32 width, height;
208 volatile png_uint_32 alpha_width, alpha_height;
209 png_uint_32 maxval;
210 volatile int bit_depth = 0;
211 int channels;
212 int alpha_depth = 0;
213 int alpha_present;
214 int row, col;
215 BOOL raw, alpha_raw = FALSE;
216#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
217 BOOL packed_bitmap = FALSE;
218#endif
219 png_uint_32 tmp16;
220 int i;
221
222 /* read header of PNM file */
223
224 get_token(pnm_file, type_token);
225 if (type_token[0] != 'P')
226 {
227 return FALSE;
228 }
229 else if ((type_token[1] == '1') || (type_token[1] == '4'))
230 {
231#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
232 raw = (type_token[1] == '4');
233 color_type = PNG_COLOR_TYPE_GRAY;
234 get_token(pnm_file, width_token);
235 sscanf (width_token, "%lu", &ul_width);
236 width = (png_uint_32) ul_width;
237 get_token(pnm_file, height_token);
238 sscanf (height_token, "%lu", &ul_height);
239 height = (png_uint_32) ul_height;
240 bit_depth = 1;
241 packed_bitmap = TRUE;
242#else
243 fprintf (stderr, "PNM2PNG built without PNG_WRITE_INVERT_SUPPORTED and \n");
244 fprintf (stderr, "PNG_WRITE_PACK_SUPPORTED can't read PBM (P1,P4) files\n");
245#endif
246 }
247 else if ((type_token[1] == '2') || (type_token[1] == '5'))
248 {
249 raw = (type_token[1] == '5');
250 color_type = PNG_COLOR_TYPE_GRAY;
251 get_token(pnm_file, width_token);
252 sscanf (width_token, "%lu", &ul_width);
253 width = (png_uint_32) ul_width;
254 get_token(pnm_file, height_token);
255 sscanf (height_token, "%lu", &ul_height);
256 height = (png_uint_32) ul_height;
257 get_token(pnm_file, maxval_token);
258 sscanf (maxval_token, "%lu", &ul_maxval);
259 maxval = (png_uint_32) ul_maxval;
260
261 if (maxval <= 1)
262 bit_depth = 1;
263 else if (maxval <= 3)
264 bit_depth = 2;
265 else if (maxval <= 15)
266 bit_depth = 4;
267 else if (maxval <= 255)
268 bit_depth = 8;
269 else /* if (maxval <= 65535) */
270 bit_depth = 16;
271 }
272 else if ((type_token[1] == '3') || (type_token[1] == '6'))
273 {
274 raw = (type_token[1] == '6');
275 color_type = PNG_COLOR_TYPE_RGB;
276 get_token(pnm_file, width_token);
277 sscanf (width_token, "%lu", &ul_width);
278 width = (png_uint_32) ul_width;
279 get_token(pnm_file, height_token);
280 sscanf (height_token, "%lu", &ul_height);
281 height = (png_uint_32) ul_height;
282 get_token(pnm_file, maxval_token);
283 sscanf (maxval_token, "%lu", &ul_maxval);
284 maxval = (png_uint_32) ul_maxval;
285 if (maxval <= 1)
286 bit_depth = 1;
287 else if (maxval <= 3)
288 bit_depth = 2;
289 else if (maxval <= 15)
290 bit_depth = 4;
291 else if (maxval <= 255)
292 bit_depth = 8;
293 else /* if (maxval <= 65535) */
294 bit_depth = 16;
295 }
296 else
297 {
298 return FALSE;
299 }
300
301 /* read header of PGM file with alpha channel */
302
303 if (alpha)
304 {
305 if (color_type == PNG_COLOR_TYPE_GRAY)
306 color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
307 if (color_type == PNG_COLOR_TYPE_RGB)
308 color_type = PNG_COLOR_TYPE_RGB_ALPHA;
309
310 get_token(alpha_file, type_token);
311 if (type_token[0] != 'P')
312 {
313 return FALSE;
314 }
315 else if ((type_token[1] == '2') || (type_token[1] == '5'))
316 {
317 alpha_raw = (type_token[1] == '5');
318 get_token(alpha_file, width_token);
319 sscanf (width_token, "%lu", &ul_alpha_width);
320 alpha_width=(png_uint_32) ul_alpha_width;
321 if (alpha_width != width)
322 return FALSE;
323 get_token(alpha_file, height_token);
324 sscanf (height_token, "%lu", &ul_alpha_height);
325 alpha_height = (png_uint_32) ul_alpha_height;
326 if (alpha_height != height)
327 return FALSE;
328 get_token(alpha_file, maxval_token);
329 sscanf (maxval_token, "%lu", &ul_maxval);
330 maxval = (png_uint_32) ul_maxval;
331 if (maxval <= 1)
332 alpha_depth = 1;
333 else if (maxval <= 3)
334 alpha_depth = 2;
335 else if (maxval <= 15)
336 alpha_depth = 4;
337 else if (maxval <= 255)
338 alpha_depth = 8;
339 else /* if (maxval <= 65535) */
340 alpha_depth = 16;
341 if (alpha_depth != bit_depth)
342 return FALSE;
343 }
344 else
345 {
346 return FALSE;
347 }
348 } /* end if alpha */
349
350 /* calculate the number of channels and store alpha-presence */
351 if (color_type == PNG_COLOR_TYPE_GRAY)
352 channels = 1;
353 else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
354 channels = 2;
355 else if (color_type == PNG_COLOR_TYPE_RGB)
356 channels = 3;
357 else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
358 channels = 4;
359 else
360 channels = 0; /* should not happen */
361
362 alpha_present = (channels - 1) % 2;
363
364#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
365 if (packed_bitmap)
366 /* row data is as many bytes as can fit width x channels x bit_depth */
367 row_bytes = (width * channels * bit_depth + 7) / 8;
368 else
369#endif
370 /* row_bytes is the width x number of channels x (bit-depth / 8) */
371 row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
372
373 if ((png_pixels = (png_byte *)
374 malloc (row_bytes * height * sizeof (png_byte))) == NULL)
375 return FALSE;
376
377 /* read data from PNM file */
378 pix_ptr = png_pixels;
379
380 for (row = 0; row < (int) height; row++)
381 {
382#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
383 if (packed_bitmap) {
384 for (i = 0; i < (int) row_bytes; i++)
385 /* png supports this format natively so no conversion is needed */
386 *pix_ptr++ = get_data (pnm_file, 8);
387 } else
388#endif
389 {
390 for (col = 0; col < (int) width; col++)
391 {
392 for (i = 0; i < (channels - alpha_present); i++)
393 {
394 if (raw)
395 *pix_ptr++ = get_data (pnm_file, bit_depth);
396 else
397 if (bit_depth <= 8)
398 *pix_ptr++ = get_value (pnm_file, bit_depth);
399 else
400 {
401 tmp16 = get_value (pnm_file, bit_depth);
402 *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
403 pix_ptr++;
404 *pix_ptr = (png_byte) (tmp16 & 0xFF);
405 pix_ptr++;
406 }
407 }
408
409 if (alpha) /* read alpha-channel from pgm file */
410 {
411 if (alpha_raw)
412 *pix_ptr++ = get_data (alpha_file, alpha_depth);
413 else
414 if (alpha_depth <= 8)
415 *pix_ptr++ = get_value (alpha_file, bit_depth);
416 else
417 {
418 tmp16 = get_value (alpha_file, bit_depth);
419 *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
420 *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
421 }
422 } /* if alpha */
423 } /* if packed_bitmap */
424 } /* end for col */
425 } /* end for row */
426
427 /* prepare the standard PNG structures */
428 png_ptr = png_create_write_struct (png_get_libpng_ver(NULL), NULL, NULL,
429 NULL);
430 if (!png_ptr)
431 {
432 return FALSE;
433 }
434 info_ptr = png_create_info_struct (png_ptr);
435 if (!info_ptr)
436 {
437 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
438 return FALSE;
439 }
440
441#if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
442 if (packed_bitmap == TRUE)
443 {
444 png_set_packing (png_ptr);
445 png_set_invert_mono (png_ptr);
446 }
447#endif
448
449 /* setjmp() must be called in every function that calls a PNG-reading libpng function */
450 if (setjmp (png_jmpbuf(png_ptr)))
451 {
452 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
453 return FALSE;
454 }
455
456 /* initialize the png structure */
457 png_init_io (png_ptr, png_file);
458
459 /* we're going to write more or less the same PNG as the input file */
460 png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
461 (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
462 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
463
464 /* write the file header information */
465 png_write_info (png_ptr, info_ptr);
466
467 /* if needed we will allocate memory for an new array of row-pointers */
468 if (row_pointers == (unsigned char**) NULL)
469 {
470 if ((row_pointers = (png_byte **)
471 malloc (height * sizeof (png_bytep))) == NULL)
472 {
473 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
474 return FALSE;
475 }
476 }
477
478 /* set the individual row_pointers to point at the correct offsets */
479 for (i = 0; i < (int) height; i++)
480 row_pointers[i] = png_pixels + i * row_bytes;
481
482 /* write out the entire image data in one call */
483 png_write_image (png_ptr, row_pointers);
484
485 /* write the additional chunks to the PNG file (not really needed) */
486 png_write_end (png_ptr, info_ptr);
487
488 /* clean up after the write, and free any memory allocated */
489 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
490
491 if (row_pointers != (unsigned char**) NULL)
492 free (row_pointers);
493 if (png_pixels != (unsigned char*) NULL)
494 free (png_pixels);
495
496 return TRUE;
497} /* end of pnm2png */
498
499/*
500 * get_token() - gets the first string after whitespace
501 */
502
503void get_token(FILE *pnm_file, char *token)
504{
505 int i = 0;
506 int ret;
507
508 /* remove white-space and comment lines */
509 do
510 {
511 ret = fgetc(pnm_file);
512 if (ret == '#') {
513 /* the rest of this line is a comment */
514 do
515 {
516 ret = fgetc(pnm_file);
517 }
518 while ((ret != '\n') && (ret != '\r') && (ret != EOF));
519 }
520 if (ret == EOF) break;
521 token[i] = (unsigned char) ret;
522 }
523 while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
524
525 /* read string */
526 do
527 {
528 ret = fgetc(pnm_file);
529 if (ret == EOF) break;
530 i++;
531 token[i] = (unsigned char) ret;
532 }
533 while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
534
535 token[i] = '\0';
536
537 return;
538}
539
540/*
541 * get_data() - takes first byte and converts into next pixel value,
542 * taking as much bits as defined by bit-depth and
543 * using the bit-depth to fill up a byte (0Ah -> AAh)
544 */
545
546png_uint_32 get_data (FILE *pnm_file, int depth)
547{
548 static int bits_left = 0;
549 static int old_value = 0;
550 static int mask = 0;
551 int i;
552 png_uint_32 ret_value;
553
554 if (mask == 0)
555 for (i = 0; i < depth; i++)
556 mask = (mask >> 1) | 0x80;
557
558 if (bits_left <= 0)
559 {
560 old_value = fgetc (pnm_file);
561 bits_left = 8;
562 }
563
564 ret_value = old_value & mask;
565 for (i = 1; i < (8 / depth); i++)
566 ret_value = ret_value || (ret_value >> depth);
567
568 old_value = (old_value << depth) & 0xFF;
569 bits_left -= depth;
570
571 return ret_value;
572}
573
574/*
575 * get_value() - takes first (numeric) string and converts into number,
576 * using the bit-depth to fill up a byte (0Ah -> AAh)
577 */
578
579png_uint_32 get_value (FILE *pnm_file, int depth)
580{
581 static png_uint_32 mask = 0;
582 png_byte token[16];
583 unsigned long ul_ret_value;
584 png_uint_32 ret_value;
585 int i = 0;
586
587 if (mask == 0)
588 for (i = 0; i < depth; i++)
589 mask = (mask << 1) | 0x01;
590
591 get_token (pnm_file, (char *) token);
592 sscanf ((const char *) token, "%lu", &ul_ret_value);
593 ret_value = (png_uint_32) ul_ret_value;
594
595 ret_value &= mask;
596
597 if (depth < 8)
598 for (i = 0; i < (8 / depth); i++)
599 ret_value = (ret_value << depth) || ret_value;
600
601 return ret_value;
602}
603
604/* end of source */
605