The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /* |
| 2 | * png2pnm.c --- conversion from PNG-file to PGM/PPM-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 |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 21 | #include <zlib.h> |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | #ifdef __TURBOC__ |
| 34 | #define STDIN 0 |
| 35 | #define STDOUT 1 |
| 36 | #define STDERR 2 |
| 37 | #endif |
| 38 | |
| 39 | /* to make png2pnm verbose so we can find problems (needs to be before png.h) */ |
| 40 | #ifndef PNG_DEBUG |
| 41 | #define PNG_DEBUG 0 |
| 42 | #endif |
| 43 | |
| 44 | #include "png.h" |
| 45 | |
| 46 | /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */ |
| 47 | #ifndef png_jmpbuf |
| 48 | # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) |
| 49 | #endif |
| 50 | |
| 51 | /* function prototypes */ |
| 52 | |
| 53 | int main (int argc, char *argv[]); |
| 54 | void usage (); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 55 | BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, BOOL raw, |
| 56 | BOOL alpha); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * main |
| 60 | */ |
| 61 | |
| 62 | int main(int argc, char *argv[]) |
| 63 | { |
| 64 | FILE *fp_rd = stdin; |
| 65 | FILE *fp_wr = stdout; |
| 66 | FILE *fp_al = NULL; |
| 67 | BOOL raw = TRUE; |
| 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 'n': |
| 78 | raw = FALSE; |
| 79 | break; |
| 80 | case 'r': |
| 81 | raw = TRUE; |
| 82 | break; |
| 83 | case 'a': |
| 84 | alpha = TRUE; |
| 85 | argi++; |
| 86 | if ((fp_al = fopen (argv[argi], "wb")) == NULL) |
| 87 | { |
| 88 | fprintf (stderr, "PNM2PNG\n"); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 89 | fprintf (stderr, "Error: can not create alpha-channel file %s\n", |
| 90 | argv[argi]); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 91 | exit (1); |
| 92 | } |
| 93 | break; |
| 94 | case 'h': |
| 95 | case '?': |
| 96 | usage(); |
| 97 | exit(0); |
| 98 | break; |
| 99 | default: |
| 100 | fprintf (stderr, "PNG2PNM\n"); |
| 101 | fprintf (stderr, "Error: unknown option %s\n", argv[argi]); |
| 102 | usage(); |
| 103 | exit(1); |
| 104 | break; |
| 105 | } /* end switch */ |
| 106 | } |
| 107 | else if (fp_rd == stdin) |
| 108 | { |
| 109 | if ((fp_rd = fopen (argv[argi], "rb")) == NULL) |
| 110 | { |
| 111 | fprintf (stderr, "PNG2PNM\n"); |
| 112 | fprintf (stderr, "Error: file %s does not exist\n", argv[argi]); |
| 113 | exit (1); |
| 114 | } |
| 115 | } |
| 116 | else if (fp_wr == stdout) |
| 117 | { |
| 118 | if ((fp_wr = fopen (argv[argi], "wb")) == NULL) |
| 119 | { |
| 120 | fprintf (stderr, "PNG2PNM\n"); |
| 121 | fprintf (stderr, "Error: can not create file %s\n", argv[argi]); |
| 122 | exit (1); |
| 123 | } |
| 124 | } |
| 125 | else |
| 126 | { |
| 127 | fprintf (stderr, "PNG2PNM\n"); |
| 128 | fprintf (stderr, "Error: too many parameters\n"); |
| 129 | usage(); |
| 130 | exit(1); |
| 131 | } |
| 132 | } /* end for */ |
| 133 | |
| 134 | #ifdef __TURBOC__ |
| 135 | /* set stdin/stdout if required to binary */ |
| 136 | if (fp_rd == stdin) |
| 137 | { |
| 138 | setmode (STDIN, O_BINARY); |
| 139 | } |
| 140 | if ((raw) && (fp_wr == stdout)) |
| 141 | { |
| 142 | setmode (STDOUT, O_BINARY); |
| 143 | } |
| 144 | #endif |
| 145 | |
| 146 | /* call the conversion program itself */ |
| 147 | if (png2pnm (fp_rd, fp_wr, fp_al, raw, alpha) == FALSE) |
| 148 | { |
| 149 | fprintf (stderr, "PNG2PNM\n"); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 150 | fprintf (stderr, "Error: unsuccessful conversion of PNG-image\n"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 151 | exit(1); |
| 152 | } |
| 153 | |
| 154 | /* close input file */ |
| 155 | fclose (fp_rd); |
| 156 | /* close output file */ |
| 157 | fclose (fp_wr); |
| 158 | /* close alpha file */ |
| 159 | if (alpha) |
| 160 | fclose (fp_al); |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * usage |
| 167 | */ |
| 168 | |
| 169 | void usage() |
| 170 | { |
| 171 | fprintf (stderr, "PNG2PNM\n"); |
| 172 | fprintf (stderr, " by Willem van Schaik, 1999\n"); |
| 173 | #ifdef __TURBOC__ |
| 174 | fprintf (stderr, " for Turbo-C and Borland-C compilers\n"); |
| 175 | #else |
| 176 | fprintf (stderr, " for Linux (and Unix) compilers\n"); |
| 177 | #endif |
| 178 | fprintf (stderr, "Usage: png2pnm [options] <file>.png [<file>.pnm]\n"); |
| 179 | fprintf (stderr, " or: ... | png2pnm [options]\n"); |
| 180 | fprintf (stderr, "Options:\n"); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 181 | fprintf (stderr, |
| 182 | " -r[aw] write pnm-file in binary format (P4/P5/P6) (default)\n"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 183 | fprintf (stderr, " -n[oraw] write pnm-file in ascii format (P1/P2/P3)\n"); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 184 | fprintf (stderr, |
| 185 | " -a[lpha] <file>.pgm write PNG alpha channel as pgm-file\n"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 186 | fprintf (stderr, " -h | -? print this help-information\n"); |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * png2pnm |
| 191 | */ |
| 192 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 193 | BOOL png2pnm (FILE *png_file, FILE *pnm_file, FILE *alpha_file, |
| 194 | volatile BOOL raw, BOOL alpha) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 195 | { |
| 196 | png_struct *png_ptr = NULL; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 197 | png_info *info_ptr = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 198 | png_byte buf[8]; |
| 199 | png_byte *png_pixels = NULL; |
| 200 | png_byte **row_pointers = NULL; |
| 201 | png_byte *pix_ptr = NULL; |
| 202 | png_uint_32 row_bytes; |
| 203 | |
| 204 | png_uint_32 width; |
| 205 | png_uint_32 height; |
| 206 | int bit_depth; |
| 207 | int channels; |
| 208 | int color_type; |
| 209 | int alpha_present; |
| 210 | int row, col; |
| 211 | int ret; |
| 212 | int i; |
| 213 | long dep_16; |
| 214 | |
| 215 | /* read and check signature in PNG file */ |
| 216 | ret = fread (buf, 1, 8, png_file); |
| 217 | if (ret != 8) |
| 218 | return FALSE; |
| 219 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 220 | ret = png_sig_cmp (buf, 0, 8); |
| 221 | if (ret) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 222 | return FALSE; |
| 223 | |
| 224 | /* create png and info structures */ |
| 225 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 226 | png_ptr = png_create_read_struct (png_get_libpng_ver(NULL), |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 227 | NULL, NULL, NULL); |
| 228 | if (!png_ptr) |
| 229 | return FALSE; /* out of memory */ |
| 230 | |
| 231 | info_ptr = png_create_info_struct (png_ptr); |
| 232 | if (!info_ptr) |
| 233 | { |
| 234 | png_destroy_read_struct (&png_ptr, NULL, NULL); |
| 235 | return FALSE; /* out of memory */ |
| 236 | } |
| 237 | |
| 238 | if (setjmp (png_jmpbuf(png_ptr))) |
| 239 | { |
| 240 | png_destroy_read_struct (&png_ptr, &info_ptr, NULL); |
| 241 | return FALSE; |
| 242 | } |
| 243 | |
| 244 | /* set up the input control for C streams */ |
| 245 | png_init_io (png_ptr, png_file); |
| 246 | png_set_sig_bytes (png_ptr, 8); /* we already read the 8 signature bytes */ |
| 247 | |
| 248 | /* read the file information */ |
| 249 | png_read_info (png_ptr, info_ptr); |
| 250 | |
| 251 | /* get size and bit-depth of the PNG-image */ |
| 252 | png_get_IHDR (png_ptr, info_ptr, |
| 253 | &width, &height, &bit_depth, &color_type, |
| 254 | NULL, NULL, NULL); |
| 255 | |
| 256 | /* set-up the transformations */ |
| 257 | |
| 258 | /* transform paletted images into full-color rgb */ |
| 259 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 260 | png_set_expand (png_ptr); |
| 261 | /* expand images to bit-depth 8 (only applicable for grayscale images) */ |
| 262 | if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) |
| 263 | png_set_expand (png_ptr); |
| 264 | /* transform transparency maps into full alpha-channel */ |
| 265 | if (png_get_valid (png_ptr, info_ptr, PNG_INFO_tRNS)) |
| 266 | png_set_expand (png_ptr); |
| 267 | |
| 268 | #ifdef NJET |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 269 | /* downgrade 16-bit images to 8-bit */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 270 | if (bit_depth == 16) |
| 271 | png_set_strip_16 (png_ptr); |
| 272 | /* transform grayscale images into full-color */ |
| 273 | if (color_type == PNG_COLOR_TYPE_GRAY || |
| 274 | color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 275 | png_set_gray_to_rgb (png_ptr); |
| 276 | /* only if file has a file gamma, we do a correction */ |
| 277 | if (png_get_gAMA (png_ptr, info_ptr, &file_gamma)) |
| 278 | png_set_gamma (png_ptr, (double) 2.2, file_gamma); |
| 279 | #endif |
| 280 | |
| 281 | /* all transformations have been registered; now update info_ptr data, |
| 282 | * get rowbytes and channels, and allocate image memory */ |
| 283 | |
| 284 | png_read_update_info (png_ptr, info_ptr); |
| 285 | |
| 286 | /* get the new color-type and bit-depth (after expansion/stripping) */ |
| 287 | png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, |
| 288 | NULL, NULL, NULL); |
| 289 | |
| 290 | /* check for 16-bit files */ |
| 291 | if (bit_depth == 16) |
| 292 | { |
| 293 | raw = FALSE; |
| 294 | #ifdef __TURBOC__ |
| 295 | pnm_file->flags &= ~((unsigned) _F_BIN); |
| 296 | #endif |
| 297 | } |
| 298 | |
| 299 | /* calculate new number of channels and store alpha-presence */ |
| 300 | if (color_type == PNG_COLOR_TYPE_GRAY) |
| 301 | channels = 1; |
| 302 | else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 303 | channels = 2; |
| 304 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 305 | channels = 3; |
| 306 | else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 307 | channels = 4; |
| 308 | else |
| 309 | channels = 0; /* should never happen */ |
| 310 | alpha_present = (channels - 1) % 2; |
| 311 | |
| 312 | /* check if alpha is expected to be present in file */ |
| 313 | if (alpha && !alpha_present) |
| 314 | { |
| 315 | fprintf (stderr, "PNG2PNM\n"); |
| 316 | fprintf (stderr, "Error: PNG-file doesn't contain alpha channel\n"); |
| 317 | exit (1); |
| 318 | } |
| 319 | |
| 320 | /* row_bytes is the width x number of channels x (bit-depth / 8) */ |
| 321 | row_bytes = png_get_rowbytes (png_ptr, info_ptr); |
| 322 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 323 | if ((png_pixels = (png_byte *) |
| 324 | malloc (row_bytes * height * sizeof (png_byte))) == NULL) { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 325 | png_destroy_read_struct (&png_ptr, &info_ptr, NULL); |
| 326 | return FALSE; |
| 327 | } |
| 328 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 329 | if ((row_pointers = (png_byte **) |
| 330 | malloc (height * sizeof (png_bytep))) == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 331 | { |
| 332 | png_destroy_read_struct (&png_ptr, &info_ptr, NULL); |
| 333 | free (png_pixels); |
| 334 | png_pixels = NULL; |
| 335 | return FALSE; |
| 336 | } |
| 337 | |
| 338 | /* set the individual row_pointers to point at the correct offsets */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 339 | for (i = 0; i < ((int) height); i++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 340 | row_pointers[i] = png_pixels + i * row_bytes; |
| 341 | |
| 342 | /* now we can go ahead and just read the whole image */ |
| 343 | png_read_image (png_ptr, row_pointers); |
| 344 | |
| 345 | /* read rest of file, and get additional chunks in info_ptr - REQUIRED */ |
| 346 | png_read_end (png_ptr, info_ptr); |
| 347 | |
| 348 | /* clean up after the read, and free any memory allocated - REQUIRED */ |
| 349 | png_destroy_read_struct (&png_ptr, &info_ptr, (png_infopp) NULL); |
| 350 | |
| 351 | /* write header of PNM file */ |
| 352 | |
| 353 | if ((color_type == PNG_COLOR_TYPE_GRAY) || |
| 354 | (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) |
| 355 | { |
| 356 | fprintf (pnm_file, "%s\n", (raw) ? "P5" : "P2"); |
| 357 | fprintf (pnm_file, "%d %d\n", (int) width, (int) height); |
| 358 | fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); |
| 359 | } |
| 360 | else if ((color_type == PNG_COLOR_TYPE_RGB) || |
| 361 | (color_type == PNG_COLOR_TYPE_RGB_ALPHA)) |
| 362 | { |
| 363 | fprintf (pnm_file, "%s\n", (raw) ? "P6" : "P3"); |
| 364 | fprintf (pnm_file, "%d %d\n", (int) width, (int) height); |
| 365 | fprintf (pnm_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); |
| 366 | } |
| 367 | |
| 368 | /* write header of PGM file with alpha channel */ |
| 369 | |
| 370 | if ((alpha) && |
| 371 | ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) || |
| 372 | (color_type == PNG_COLOR_TYPE_RGB_ALPHA))) |
| 373 | { |
| 374 | fprintf (alpha_file, "%s\n", (raw) ? "P5" : "P2"); |
| 375 | fprintf (alpha_file, "%d %d\n", (int) width, (int) height); |
| 376 | fprintf (alpha_file, "%ld\n", ((1L << (int) bit_depth) - 1L)); |
| 377 | } |
| 378 | |
| 379 | /* write data to PNM file */ |
| 380 | pix_ptr = png_pixels; |
| 381 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 382 | for (row = 0; row < (int) height; row++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 383 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 384 | for (col = 0; col < (int) width; col++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 385 | { |
| 386 | for (i = 0; i < (channels - alpha_present); i++) |
| 387 | { |
| 388 | if (raw) |
| 389 | fputc ((int) *pix_ptr++ , pnm_file); |
| 390 | else |
| 391 | if (bit_depth == 16){ |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 392 | dep_16 = (long) *pix_ptr++; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 393 | fprintf (pnm_file, "%ld ", (dep_16 << 8) + ((long) *pix_ptr++)); |
| 394 | } |
| 395 | else |
| 396 | fprintf (pnm_file, "%ld ", (long) *pix_ptr++); |
| 397 | } |
| 398 | if (alpha_present) |
| 399 | { |
| 400 | if (!alpha) |
| 401 | { |
| 402 | pix_ptr++; /* alpha */ |
| 403 | if (bit_depth == 16) |
| 404 | pix_ptr++; |
| 405 | } |
| 406 | else /* output alpha-channel as pgm file */ |
| 407 | { |
| 408 | if (raw) |
| 409 | fputc ((int) *pix_ptr++ , alpha_file); |
| 410 | else |
| 411 | if (bit_depth == 16){ |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 412 | dep_16 = (long) *pix_ptr++; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 413 | fprintf (alpha_file, "%ld ", (dep_16 << 8) + (long) *pix_ptr++); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 414 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 415 | else |
| 416 | fprintf (alpha_file, "%ld ", (long) *pix_ptr++); |
| 417 | } |
| 418 | } /* if alpha_present */ |
| 419 | |
| 420 | if (!raw) |
| 421 | if (col % 4 == 3) |
| 422 | fprintf (pnm_file, "\n"); |
| 423 | } /* end for col */ |
| 424 | |
| 425 | if (!raw) |
| 426 | if (col % 4 != 0) |
| 427 | fprintf (pnm_file, "\n"); |
| 428 | } /* end for row */ |
| 429 | |
| 430 | if (row_pointers != (unsigned char**) NULL) |
| 431 | free (row_pointers); |
| 432 | if (png_pixels != (unsigned char*) NULL) |
| 433 | free (png_pixels); |
| 434 | |
| 435 | return TRUE; |
| 436 | |
| 437 | } /* end of source */ |
| 438 | |