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 |
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 | #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; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 213 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| 214 | BOOL packed_bitmap = FALSE; |
| 215 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 228 | #if defined(PNG_WRITE_INVERT_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 229 | raw = (type_token[1] == '4'); |
| 230 | color_type = PNG_COLOR_TYPE_GRAY; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 237 | bit_depth = 1; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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 |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 249 | sscanf (width_token, "%lu", &ul_width); |
| 250 | width = (png_uint_32) ul_width; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 251 | get_token(pnm_file, height_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 252 | sscanf (height_token, "%lu", &ul_height); |
| 253 | height = (png_uint_32) ul_height; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 254 | get_token(pnm_file, maxval_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 255 | sscanf (maxval_token, "%lu", &ul_maxval); |
| 256 | maxval = (png_uint_32) ul_maxval; |
| 257 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 274 | sscanf (width_token, "%lu", &ul_width); |
| 275 | width = (png_uint_32) ul_width; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 276 | get_token(pnm_file, height_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 277 | sscanf (height_token, "%lu", &ul_height); |
| 278 | height = (png_uint_32) ul_height; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 279 | get_token(pnm_file, maxval_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 280 | sscanf (maxval_token, "%lu", &ul_maxval); |
| 281 | maxval = (png_uint_32) ul_maxval; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 316 | sscanf (width_token, "%lu", &ul_alpha_width); |
| 317 | alpha_width=(png_uint_32) ul_alpha_width; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 318 | if (alpha_width != width) |
| 319 | return FALSE; |
| 320 | get_token(alpha_file, height_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 321 | sscanf (height_token, "%lu", &ul_alpha_height); |
| 322 | alpha_height = (png_uint_32) ul_alpha_height; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 323 | if (alpha_height != height) |
| 324 | return FALSE; |
| 325 | get_token(alpha_file, maxval_token); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 326 | sscanf (maxval_token, "%lu", &ul_maxval); |
| 327 | maxval = (png_uint_32) ul_maxval; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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 |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 385 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 386 | for (col = 0; col < width; col++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 387 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 388 | for (i = 0; i < (channels - alpha_present); i++) |
| 389 | { |
| 390 | if (raw) |
| 391 | *pix_ptr++ = get_data (pnm_file, bit_depth); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 392 | else |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 404 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 405 | if (alpha) /* read alpha-channel from pgm file */ |
| 406 | { |
| 407 | if (alpha_raw) |
| 408 | *pix_ptr++ = get_data (alpha_file, alpha_depth); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 409 | else |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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 */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 500 | int ret; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 501 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 502 | /* remove white-space and comment lines */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 503 | do |
| 504 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 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; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 516 | } |
| 517 | while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' ')); |
| 518 | |
| 519 | /* read string */ |
| 520 | do |
| 521 | { |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 522 | ret = fgetc(pnm_file); |
| 523 | if (ret == EOF) break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 524 | i++; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 525 | token[i] = (unsigned char) ret; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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]; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 577 | unsigned long ul_ret_value; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame^] | 586 | sscanf ((const char *) token, "%lu", &ul_ret_value); |
| 587 | ret_value = (png_uint_32) ul_ret_value; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 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 | |