The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame^] | 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 | |
| 22 | #ifndef BOOL |
| 23 | #define BOOL unsigned char |
| 24 | #endif |
| 25 | #ifndef TRUE |
| 26 | #define TRUE (BOOL) 1 |
| 27 | #endif |
| 28 | #ifndef FALSE |
| 29 | #define FALSE (BOOL) 0 |
| 30 | #endif |
| 31 | |
| 32 | #define STDIN 0 |
| 33 | #define STDOUT 1 |
| 34 | #define STDERR 2 |
| 35 | |
| 36 | /* to make pnm2png verbose so we can find problems (needs to be before png.h) */ |
| 37 | #ifndef PNG_DEBUG |
| 38 | #define PNG_DEBUG 0 |
| 39 | #endif |
| 40 | |
| 41 | #include "png.h" |
| 42 | |
| 43 | /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */ |
| 44 | #ifndef png_jmpbuf |
| 45 | # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) |
| 46 | #endif |
| 47 | |
| 48 | /* function prototypes */ |
| 49 | |
| 50 | int main (int argc, char *argv[]); |
| 51 | void usage (); |
| 52 | BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha); |
| 53 | void get_token(FILE *pnm_file, char *token); |
| 54 | png_uint_32 get_data (FILE *pnm_file, int depth); |
| 55 | png_uint_32 get_value (FILE *pnm_file, int depth); |
| 56 | |
| 57 | /* |
| 58 | * main |
| 59 | */ |
| 60 | |
| 61 | int main(int argc, char *argv[]) |
| 62 | { |
| 63 | FILE *fp_rd = stdin; |
| 64 | FILE *fp_al = NULL; |
| 65 | FILE *fp_wr = stdout; |
| 66 | BOOL interlace = FALSE; |
| 67 | BOOL alpha = FALSE; |
| 68 | int argi; |
| 69 | |
| 70 | for (argi = 1; argi < argc; argi++) |
| 71 | { |
| 72 | if (argv[argi][0] == '-') |
| 73 | { |
| 74 | switch (argv[argi][1]) |
| 75 | { |
| 76 | case 'i': |
| 77 | interlace = TRUE; |
| 78 | break; |
| 79 | case 'a': |
| 80 | alpha = TRUE; |
| 81 | argi++; |
| 82 | if ((fp_al = fopen (argv[argi], "rb")) == NULL) |
| 83 | { |
| 84 | fprintf (stderr, "PNM2PNG\n"); |
| 85 | fprintf (stderr, "Error: alpha-channel file %s does not exist\n", |
| 86 | argv[argi]); |
| 87 | exit (1); |
| 88 | } |
| 89 | break; |
| 90 | case 'h': |
| 91 | case '?': |
| 92 | usage(); |
| 93 | exit(0); |
| 94 | break; |
| 95 | default: |
| 96 | fprintf (stderr, "PNM2PNG\n"); |
| 97 | fprintf (stderr, "Error: unknown option %s\n", argv[argi]); |
| 98 | usage(); |
| 99 | exit(1); |
| 100 | break; |
| 101 | } /* end switch */ |
| 102 | } |
| 103 | else if (fp_rd == stdin) |
| 104 | { |
| 105 | if ((fp_rd = fopen (argv[argi], "rb")) == NULL) |
| 106 | { |
| 107 | fprintf (stderr, "PNM2PNG\n"); |
| 108 | fprintf (stderr, "Error: file %s does not exist\n", argv[argi]); |
| 109 | exit (1); |
| 110 | } |
| 111 | } |
| 112 | else if (fp_wr == stdout) |
| 113 | { |
| 114 | if ((fp_wr = fopen (argv[argi], "wb")) == NULL) |
| 115 | { |
| 116 | fprintf (stderr, "PNM2PNG\n"); |
| 117 | fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]); |
| 118 | exit (1); |
| 119 | } |
| 120 | } |
| 121 | else |
| 122 | { |
| 123 | fprintf (stderr, "PNM2PNG\n"); |
| 124 | fprintf (stderr, "Error: too many parameters\n"); |
| 125 | usage(); |
| 126 | exit (1); |
| 127 | } |
| 128 | } /* end for */ |
| 129 | |
| 130 | #ifdef __TURBOC__ |
| 131 | /* set stdin/stdout to binary, we're reading the PNM always! in binary format */ |
| 132 | if (fp_rd == stdin) |
| 133 | { |
| 134 | setmode (STDIN, O_BINARY); |
| 135 | } |
| 136 | if (fp_wr == stdout) |
| 137 | { |
| 138 | setmode (STDOUT, O_BINARY); |
| 139 | } |
| 140 | #endif |
| 141 | |
| 142 | /* call the conversion program itself */ |
| 143 | if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE) |
| 144 | { |
| 145 | fprintf (stderr, "PNM2PNG\n"); |
| 146 | fprintf (stderr, "Error: unsuccessful converting to PNG-image\n"); |
| 147 | exit (1); |
| 148 | } |
| 149 | |
| 150 | /* close input file */ |
| 151 | fclose (fp_rd); |
| 152 | /* close output file */ |
| 153 | fclose (fp_wr); |
| 154 | /* close alpha file */ |
| 155 | if (alpha) |
| 156 | fclose (fp_al); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * usage |
| 163 | */ |
| 164 | |
| 165 | void usage() |
| 166 | { |
| 167 | fprintf (stderr, "PNM2PNG\n"); |
| 168 | fprintf (stderr, " by Willem van Schaik, 1999\n"); |
| 169 | #ifdef __TURBOC__ |
| 170 | fprintf (stderr, " for Turbo-C and Borland-C compilers\n"); |
| 171 | #else |
| 172 | fprintf (stderr, " for Linux (and Unix) compilers\n"); |
| 173 | #endif |
| 174 | fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n"); |
| 175 | fprintf (stderr, " or: ... | pnm2png [options]\n"); |
| 176 | fprintf (stderr, "Options:\n"); |
| 177 | fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n"); |
| 178 | fprintf (stderr, " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n"); |
| 179 | fprintf (stderr, " -h | -? print this help-information\n"); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * pnm2png |
| 184 | */ |
| 185 | |
| 186 | BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha) |
| 187 | { |
| 188 | png_struct *png_ptr = NULL; |
| 189 | png_info *info_ptr = NULL; |
| 190 | png_byte *png_pixels = NULL; |
| 191 | png_byte **row_pointers = NULL; |
| 192 | png_byte *pix_ptr = NULL; |
| 193 | png_uint_32 row_bytes; |
| 194 | |
| 195 | char type_token[16]; |
| 196 | char width_token[16]; |
| 197 | char height_token[16]; |
| 198 | char maxval_token[16]; |
| 199 | int color_type; |
| 200 | png_uint_32 width, alpha_width; |
| 201 | png_uint_32 height, alpha_height; |
| 202 | png_uint_32 maxval; |
| 203 | int bit_depth = 0; |
| 204 | int channels; |
| 205 | int alpha_depth = 0; |
| 206 | int alpha_present; |
| 207 | int row, col; |
| 208 | BOOL raw, alpha_raw = FALSE; |
| 209 | png_uint_32 tmp16; |
| 210 | int i; |
| 211 | |
| 212 | /* read header of PNM file */ |
| 213 | |
| 214 | get_token(pnm_file, type_token); |
| 215 | if (type_token[0] != 'P') |
| 216 | { |
| 217 | return FALSE; |
| 218 | } |
| 219 | else if ((type_token[1] == '1') || (type_token[1] == '4')) |
| 220 | { |
| 221 | raw = (type_token[1] == '4'); |
| 222 | color_type = PNG_COLOR_TYPE_GRAY; |
| 223 | bit_depth = 1; |
| 224 | } |
| 225 | else if ((type_token[1] == '2') || (type_token[1] == '5')) |
| 226 | { |
| 227 | raw = (type_token[1] == '5'); |
| 228 | color_type = PNG_COLOR_TYPE_GRAY; |
| 229 | get_token(pnm_file, width_token); |
| 230 | sscanf (width_token, "%lu", &width); |
| 231 | get_token(pnm_file, height_token); |
| 232 | sscanf (height_token, "%lu", &height); |
| 233 | get_token(pnm_file, maxval_token); |
| 234 | sscanf (maxval_token, "%lu", &maxval); |
| 235 | if (maxval <= 1) |
| 236 | bit_depth = 1; |
| 237 | else if (maxval <= 3) |
| 238 | bit_depth = 2; |
| 239 | else if (maxval <= 15) |
| 240 | bit_depth = 4; |
| 241 | else if (maxval <= 255) |
| 242 | bit_depth = 8; |
| 243 | else /* if (maxval <= 65535) */ |
| 244 | bit_depth = 16; |
| 245 | } |
| 246 | else if ((type_token[1] == '3') || (type_token[1] == '6')) |
| 247 | { |
| 248 | raw = (type_token[1] == '6'); |
| 249 | color_type = PNG_COLOR_TYPE_RGB; |
| 250 | get_token(pnm_file, width_token); |
| 251 | sscanf (width_token, "%lu", &width); |
| 252 | get_token(pnm_file, height_token); |
| 253 | sscanf (height_token, "%lu", &height); |
| 254 | get_token(pnm_file, maxval_token); |
| 255 | sscanf (maxval_token, "%lu", &maxval); |
| 256 | if (maxval <= 1) |
| 257 | bit_depth = 1; |
| 258 | else if (maxval <= 3) |
| 259 | bit_depth = 2; |
| 260 | else if (maxval <= 15) |
| 261 | bit_depth = 4; |
| 262 | else if (maxval <= 255) |
| 263 | bit_depth = 8; |
| 264 | else /* if (maxval <= 65535) */ |
| 265 | bit_depth = 16; |
| 266 | } |
| 267 | else |
| 268 | { |
| 269 | return FALSE; |
| 270 | } |
| 271 | |
| 272 | /* read header of PGM file with alpha channel */ |
| 273 | |
| 274 | if (alpha) |
| 275 | { |
| 276 | if (color_type == PNG_COLOR_TYPE_GRAY) |
| 277 | color_type = PNG_COLOR_TYPE_GRAY_ALPHA; |
| 278 | if (color_type == PNG_COLOR_TYPE_RGB) |
| 279 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| 280 | |
| 281 | get_token(alpha_file, type_token); |
| 282 | if (type_token[0] != 'P') |
| 283 | { |
| 284 | return FALSE; |
| 285 | } |
| 286 | else if ((type_token[1] == '2') || (type_token[1] == '5')) |
| 287 | { |
| 288 | alpha_raw = (type_token[1] == '5'); |
| 289 | get_token(alpha_file, width_token); |
| 290 | sscanf (width_token, "%lu", &alpha_width); |
| 291 | if (alpha_width != width) |
| 292 | return FALSE; |
| 293 | get_token(alpha_file, height_token); |
| 294 | sscanf (height_token, "%lu", &alpha_height); |
| 295 | if (alpha_height != height) |
| 296 | return FALSE; |
| 297 | get_token(alpha_file, maxval_token); |
| 298 | sscanf (maxval_token, "%lu", &maxval); |
| 299 | if (maxval <= 1) |
| 300 | alpha_depth = 1; |
| 301 | else if (maxval <= 3) |
| 302 | alpha_depth = 2; |
| 303 | else if (maxval <= 15) |
| 304 | alpha_depth = 4; |
| 305 | else if (maxval <= 255) |
| 306 | alpha_depth = 8; |
| 307 | else /* if (maxval <= 65535) */ |
| 308 | alpha_depth = 16; |
| 309 | if (alpha_depth != bit_depth) |
| 310 | return FALSE; |
| 311 | } |
| 312 | else |
| 313 | { |
| 314 | return FALSE; |
| 315 | } |
| 316 | } /* end if alpha */ |
| 317 | |
| 318 | /* calculate the number of channels and store alpha-presence */ |
| 319 | if (color_type == PNG_COLOR_TYPE_GRAY) |
| 320 | channels = 1; |
| 321 | else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 322 | channels = 2; |
| 323 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 324 | channels = 3; |
| 325 | else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 326 | channels = 4; |
| 327 | else |
| 328 | channels = 0; /* should not happen */ |
| 329 | |
| 330 | alpha_present = (channels - 1) % 2; |
| 331 | |
| 332 | /* row_bytes is the width x number of channels x (bit-depth / 8) */ |
| 333 | row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2); |
| 334 | |
| 335 | if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL) |
| 336 | return FALSE; |
| 337 | |
| 338 | /* read data from PNM file */ |
| 339 | pix_ptr = png_pixels; |
| 340 | |
| 341 | for (row = 0; row < height; row++) |
| 342 | { |
| 343 | for (col = 0; col < width; col++) |
| 344 | { |
| 345 | for (i = 0; i < (channels - alpha_present); i++) |
| 346 | { |
| 347 | if (raw) |
| 348 | *pix_ptr++ = get_data (pnm_file, bit_depth); |
| 349 | else |
| 350 | if (bit_depth <= 8) |
| 351 | *pix_ptr++ = get_value (pnm_file, bit_depth); |
| 352 | else |
| 353 | { |
| 354 | tmp16 = get_value (pnm_file, bit_depth); |
| 355 | *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF); |
| 356 | pix_ptr++; |
| 357 | *pix_ptr = (png_byte) (tmp16 & 0xFF); |
| 358 | pix_ptr++; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | if (alpha) /* read alpha-channel from pgm file */ |
| 363 | { |
| 364 | if (alpha_raw) |
| 365 | *pix_ptr++ = get_data (alpha_file, alpha_depth); |
| 366 | else |
| 367 | if (alpha_depth <= 8) |
| 368 | *pix_ptr++ = get_value (alpha_file, bit_depth); |
| 369 | else |
| 370 | { |
| 371 | tmp16 = get_value (alpha_file, bit_depth); |
| 372 | *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF); |
| 373 | *pix_ptr++ = (png_byte) (tmp16 & 0xFF); |
| 374 | } |
| 375 | } /* if alpha */ |
| 376 | |
| 377 | } /* end for col */ |
| 378 | } /* end for row */ |
| 379 | |
| 380 | /* prepare the standard PNG structures */ |
| 381 | png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
| 382 | if (!png_ptr) |
| 383 | { |
| 384 | return FALSE; |
| 385 | } |
| 386 | info_ptr = png_create_info_struct (png_ptr); |
| 387 | if (!info_ptr) |
| 388 | { |
| 389 | png_destroy_write_struct (&png_ptr, (png_infopp) NULL); |
| 390 | return FALSE; |
| 391 | } |
| 392 | |
| 393 | /* setjmp() must be called in every function that calls a PNG-reading libpng function */ |
| 394 | if (setjmp (png_jmpbuf(png_ptr))) |
| 395 | { |
| 396 | png_destroy_write_struct (&png_ptr, (png_infopp) NULL); |
| 397 | return FALSE; |
| 398 | } |
| 399 | |
| 400 | /* initialize the png structure */ |
| 401 | png_init_io (png_ptr, png_file); |
| 402 | |
| 403 | /* we're going to write more or less the same PNG as the input file */ |
| 404 | png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type, |
| 405 | (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7, |
| 406 | PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| 407 | |
| 408 | /* write the file header information */ |
| 409 | png_write_info (png_ptr, info_ptr); |
| 410 | |
| 411 | /* if needed we will allocate memory for an new array of row-pointers */ |
| 412 | if (row_pointers == (unsigned char**) NULL) |
| 413 | { |
| 414 | if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL) |
| 415 | { |
| 416 | png_destroy_write_struct (&png_ptr, (png_infopp) NULL); |
| 417 | return FALSE; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | /* set the individual row_pointers to point at the correct offsets */ |
| 422 | for (i = 0; i < (height); i++) |
| 423 | row_pointers[i] = png_pixels + i * row_bytes; |
| 424 | |
| 425 | /* write out the entire image data in one call */ |
| 426 | png_write_image (png_ptr, row_pointers); |
| 427 | |
| 428 | /* write the additional chuncks to the PNG file (not really needed) */ |
| 429 | png_write_end (png_ptr, info_ptr); |
| 430 | |
| 431 | /* clean up after the write, and free any memory allocated */ |
| 432 | png_destroy_write_struct (&png_ptr, (png_infopp) NULL); |
| 433 | |
| 434 | if (row_pointers != (unsigned char**) NULL) |
| 435 | free (row_pointers); |
| 436 | if (png_pixels != (unsigned char*) NULL) |
| 437 | free (png_pixels); |
| 438 | |
| 439 | return TRUE; |
| 440 | } /* end of pnm2png */ |
| 441 | |
| 442 | /* |
| 443 | * get_token() - gets the first string after whitespace |
| 444 | */ |
| 445 | |
| 446 | void get_token(FILE *pnm_file, char *token) |
| 447 | { |
| 448 | int i = 0; |
| 449 | |
| 450 | /* remove white-space */ |
| 451 | do |
| 452 | { |
| 453 | token[i] = (unsigned char) fgetc (pnm_file); |
| 454 | } |
| 455 | while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' ')); |
| 456 | |
| 457 | /* read string */ |
| 458 | do |
| 459 | { |
| 460 | i++; |
| 461 | token[i] = (unsigned char) fgetc (pnm_file); |
| 462 | } |
| 463 | while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' ')); |
| 464 | |
| 465 | token[i] = '\0'; |
| 466 | |
| 467 | return; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * get_data() - takes first byte and converts into next pixel value, |
| 472 | * taking as much bits as defined by bit-depth and |
| 473 | * using the bit-depth to fill up a byte (0Ah -> AAh) |
| 474 | */ |
| 475 | |
| 476 | png_uint_32 get_data (FILE *pnm_file, int depth) |
| 477 | { |
| 478 | static int bits_left = 0; |
| 479 | static int old_value = 0; |
| 480 | static int mask = 0; |
| 481 | int i; |
| 482 | png_uint_32 ret_value; |
| 483 | |
| 484 | if (mask == 0) |
| 485 | for (i = 0; i < depth; i++) |
| 486 | mask = (mask >> 1) | 0x80; |
| 487 | |
| 488 | if (bits_left <= 0) |
| 489 | { |
| 490 | old_value = fgetc (pnm_file); |
| 491 | bits_left = 8; |
| 492 | } |
| 493 | |
| 494 | ret_value = old_value & mask; |
| 495 | for (i = 1; i < (8 / depth); i++) |
| 496 | ret_value = ret_value || (ret_value >> depth); |
| 497 | |
| 498 | old_value = (old_value << depth) & 0xFF; |
| 499 | bits_left -= depth; |
| 500 | |
| 501 | return ret_value; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * get_value() - takes first (numeric) string and converts into number, |
| 506 | * using the bit-depth to fill up a byte (0Ah -> AAh) |
| 507 | */ |
| 508 | |
| 509 | png_uint_32 get_value (FILE *pnm_file, int depth) |
| 510 | { |
| 511 | static png_uint_32 mask = 0; |
| 512 | png_byte token[16]; |
| 513 | png_uint_32 ret_value; |
| 514 | int i = 0; |
| 515 | |
| 516 | if (mask == 0) |
| 517 | for (i = 0; i < depth; i++) |
| 518 | mask = (mask << 1) | 0x01; |
| 519 | |
| 520 | get_token (pnm_file, (char *) token); |
| 521 | sscanf ((const char *) token, "%lu", &ret_value); |
| 522 | |
| 523 | ret_value &= mask; |
| 524 | |
| 525 | if (depth < 8) |
| 526 | for (i = 0; i < (8 / depth); i++) |
| 527 | ret_value = (ret_value << depth) || ret_value; |
| 528 | |
| 529 | return ret_value; |
| 530 | } |
| 531 | |
| 532 | /* end of source */ |
| 533 | |