share/png/contrib/pngminus/pnm2png.c

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