Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1 | /* makepng.c */ |
| 2 | #define _ISOC99_SOURCE |
| 3 | /* Copyright: */ |
| 4 | #define COPYRIGHT "\251 2013,2015 John Cunningham Bowler" |
| 5 | /* |
| 6 | * Last changed in libpng 1.7.0 [(PENDING RELEASE)] |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 7 | * |
| 8 | * This code is released under the libpng license. |
| 9 | * For conditions of distribution and use, see the disclaimer |
| 10 | * and license in png.h |
| 11 | * |
| 12 | * Make a test PNG image. The arguments are as follows: |
| 13 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 14 | * makepng [--sRGB|--linear|--1.8] [--tRNS] [--nofilters] \ |
| 15 | * color-type bit-depth [file-name] |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 16 | * |
| 17 | * The color-type may be numeric (and must match the numbers used by the PNG |
| 18 | * specification) or one of the format names listed below. The bit-depth is the |
| 19 | * component bit depth, or the pixel bit-depth for a color-mapped image. |
| 20 | * |
| 21 | * Without any options no color-space information is written, with the options |
| 22 | * an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the |
| 23 | * display system used on older Apple computers to correct for high ambient |
| 24 | * light levels in the viewing environment; it applies a transform of |
| 25 | * approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909 |
| 26 | * is written (1.45/2.2). |
| 27 | * |
| 28 | * The image data is generated internally. Unless --color is given the images |
| 29 | * used are as follows: |
| 30 | * |
| 31 | * 1 channel: a square image with a diamond, the least luminous colors are on |
| 32 | * the edge of the image, the most luminous in the center. |
| 33 | * |
| 34 | * 2 channels: the color channel increases in luminosity from top to bottom, the |
| 35 | * alpha channel increases in opacity from left to right. |
| 36 | * |
| 37 | * 3 channels: linear combinations of, from the top-left corner clockwise, |
| 38 | * black, green, white, red. |
| 39 | * |
| 40 | * 4 channels: linear combinations of, from the top-left corner clockwise, |
| 41 | * transparent, red, green, blue. |
| 42 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 43 | * For color-mapped images a four channel color-map is used and if --tRNS is |
| 44 | * given the PNG file has a tRNS chunk, as follows: |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 45 | * |
| 46 | * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| 47 | * 2-bit: entry 0: transparent-green |
| 48 | * entry 1: 40%-red |
| 49 | * entry 2: 80%-blue |
| 50 | * entry 3: opaque-white |
| 51 | * 4-bit: the 16 combinations of the 2-bit case |
| 52 | * 8-bit: the 256 combinations of the 4-bit case |
| 53 | * |
| 54 | * The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The |
| 55 | * image is the 1-channel diamond, but using palette index, not luminosity. |
| 56 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 57 | * For formats other than color-mapped ones if --tRNS is specified a tRNS chunk |
| 58 | * is generated with all channels equal to the low bits of 0x0101. |
| 59 | * |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 60 | * Image size is determined by the final pixel depth in bits, i.e. channels x |
| 61 | * bit-depth, as follows: |
| 62 | * |
| 63 | * 8 bits or less: 64x64 |
| 64 | * 16 bits: 256x256 |
| 65 | * More than 16 bits: 1024x1024 |
| 66 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 67 | * Row filtering is the libpng default but may be turned off (the 'none' filter |
| 68 | * is used on every row) with the --nofilters option. |
| 69 | * |
| 70 | * The images are not interlaced. |
| 71 | * |
| 72 | * If file-name is given then the PNG is written to that file, else it is |
| 73 | * written to stdout. Notice that stdout is not supported on systems where, by |
| 74 | * default, it assumes text output; this program makes no attempt to change the |
| 75 | * text mode of stdout! |
| 76 | * |
| 77 | * makepng --color=<color> ... |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 78 | * |
| 79 | * If --color is given then the whole image has that color, color-mapped images |
| 80 | * will have exactly one palette entry and all image files with be 16x16 in |
| 81 | * size. The color value is 1 to 4 decimal numbers as appropriate for the color |
| 82 | * type. |
| 83 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 84 | * makepng --small ... |
| 85 | * |
| 86 | * If --small is given the images are no larger than required to include every |
| 87 | * possible pixel value for the format. |
| 88 | * |
| 89 | * For formats with pixels 8 bits or fewer in size the images consist of a |
| 90 | * single row with 2^pixel-depth pixels, one of every possible value. |
| 91 | * |
| 92 | * For formats with 16-bit pixels a 256x256 image is generated containing every |
| 93 | * possible pixel value. |
| 94 | * |
| 95 | * For larger pixel sizes a 256x256 image is generated where the first row |
| 96 | * consists of each pixel that has identical byte values throughout the pixel |
| 97 | * followed by rows where the byte values differ within the pixel. |
| 98 | * |
| 99 | * In all cases the pixel values are arranged in such a way that the SUB and UP |
| 100 | * filters give byte sequences for maximal zlib compression. By default (if |
| 101 | * --nofilters is not given) the SUB filter is used on the first row and the UP |
| 102 | * filter on all following rows. |
| 103 | * |
| 104 | * The --small option is meant to provide good test-case coverage, however the |
| 105 | * images are not easy to examine visually. Without the --small option the |
| 106 | * images contain identical color values; the pixel values are adjusted |
| 107 | * according to the gamma encoding with no gamma encoding being interpreted as |
| 108 | * sRGB. |
| 109 | * |
| 110 | * LICENSING |
| 111 | * ========= |
| 112 | * |
| 113 | * This code is copyright of the authors, see the COPYRIGHT define above. The |
| 114 | * code is licensed as above, using the libpng license. The code generates |
| 115 | * images which are solely the product of the code; the options choose which of |
| 116 | * the many possibilities to generate. The images that result (but not the code |
| 117 | * which generates them) are licensed as defined here: |
| 118 | * |
| 119 | * IMPORTANT: the COPYRIGHT #define must contain ISO-Latin-1 characters, the |
| 120 | * IMAGE_LICENSING #define must contain UTF-8 characters. The 'copyright' |
| 121 | * symbol 0xA9U (\251) in ISO-Latin-1 encoding and 0xC20xA9 (\302\251) in UTF-8. |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 122 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 123 | #define IMAGE_LICENSING "Dedicated to the public domain per Creative Commons "\ |
| 124 | "license \"CC0 1.0\"; https://creativecommons.org/publicdomain/zero/1.0/" |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 125 | |
| 126 | #include <stddef.h> /* for offsetof */ |
| 127 | #include <stdlib.h> |
| 128 | #include <stdio.h> |
| 129 | #include <string.h> |
| 130 | #include <ctype.h> |
| 131 | #include <math.h> |
| 132 | #include <errno.h> |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 133 | #include <assert.h> |
| 134 | #include <stdint.h> |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 135 | |
| 136 | #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) |
| 137 | # include <config.h> |
| 138 | #endif |
| 139 | |
| 140 | /* Define the following to use this test against your installed libpng, rather |
| 141 | * than the one being built here: |
| 142 | */ |
| 143 | #ifdef PNG_FREESTANDING_TESTS |
| 144 | # include <png.h> |
| 145 | #else |
| 146 | # include "../../png.h" |
| 147 | #endif |
| 148 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 149 | #include <zlib.h> |
| 150 | |
| 151 | /* Work round for GCC complaints about casting a (double) function result to |
| 152 | * an unsigned: |
| 153 | */ |
| 154 | static unsigned int |
| 155 | flooru(double d) |
| 156 | { |
| 157 | d = floor(d); |
| 158 | return (unsigned int)d; |
| 159 | } |
| 160 | |
| 161 | static png_byte |
| 162 | floorb(double d) |
| 163 | { |
| 164 | d = floor(d); |
| 165 | return (png_byte)d; |
| 166 | } |
| 167 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 168 | /* This structure is used for inserting extra chunks (the --insert argument, not |
| 169 | * documented above.) |
| 170 | */ |
| 171 | typedef struct chunk_insert |
| 172 | { |
| 173 | struct chunk_insert *next; |
| 174 | void (*insert)(png_structp, png_infop, int, png_charpp); |
| 175 | int nparams; |
| 176 | png_charp parameters[1]; |
| 177 | } chunk_insert; |
| 178 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 179 | static unsigned int |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 180 | channels_of_type(int color_type) |
| 181 | { |
| 182 | if (color_type & PNG_COLOR_MASK_PALETTE) |
| 183 | return 1; |
| 184 | |
| 185 | else |
| 186 | { |
| 187 | int channels = 1; |
| 188 | |
| 189 | if (color_type & PNG_COLOR_MASK_COLOR) |
| 190 | channels = 3; |
| 191 | |
| 192 | if (color_type & PNG_COLOR_MASK_ALPHA) |
| 193 | return channels + 1; |
| 194 | |
| 195 | else |
| 196 | return channels; |
| 197 | } |
| 198 | } |
| 199 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 200 | static unsigned int |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 201 | pixel_depth_of_type(int color_type, int bit_depth) |
| 202 | { |
| 203 | return channels_of_type(color_type) * bit_depth; |
| 204 | } |
| 205 | |
| 206 | static unsigned int |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 207 | image_size_of_type(int color_type, int bit_depth, unsigned int *colors, |
| 208 | int small) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 209 | { |
| 210 | if (*colors) |
| 211 | return 16; |
| 212 | |
| 213 | else |
| 214 | { |
| 215 | int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
| 216 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 217 | if (small) |
| 218 | { |
| 219 | if (pixel_depth <= 8) /* there will be one row */ |
| 220 | return 1 << pixel_depth; |
| 221 | |
| 222 | else |
| 223 | return 256; |
| 224 | } |
| 225 | |
| 226 | else if (pixel_depth < 8) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 227 | return 64; |
| 228 | |
| 229 | else if (pixel_depth > 16) |
| 230 | return 1024; |
| 231 | |
| 232 | else |
| 233 | return 256; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | static void |
| 238 | set_color(png_colorp color, png_bytep trans, unsigned int red, |
| 239 | unsigned int green, unsigned int blue, unsigned int alpha, |
| 240 | png_const_bytep gamma_table) |
| 241 | { |
| 242 | color->red = gamma_table[red]; |
| 243 | color->green = gamma_table[green]; |
| 244 | color->blue = gamma_table[blue]; |
| 245 | *trans = (png_byte)alpha; |
| 246 | } |
| 247 | |
| 248 | static int |
| 249 | generate_palette(png_colorp palette, png_bytep trans, int bit_depth, |
| 250 | png_const_bytep gamma_table, unsigned int *colors) |
| 251 | { |
| 252 | /* |
| 253 | * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| 254 | * 2-bit: entry 0: transparent-green |
| 255 | * entry 1: 40%-red |
| 256 | * entry 2: 80%-blue |
| 257 | * entry 3: opaque-white |
| 258 | * 4-bit: the 16 combinations of the 2-bit case |
| 259 | * 8-bit: the 256 combinations of the 4-bit case |
| 260 | */ |
| 261 | switch (colors[0]) |
| 262 | { |
| 263 | default: |
| 264 | fprintf(stderr, "makepng: --colors=...: invalid count %u\n", |
| 265 | colors[0]); |
| 266 | exit(1); |
| 267 | |
| 268 | case 1: |
| 269 | set_color(palette+0, trans+0, colors[1], colors[1], colors[1], 255, |
| 270 | gamma_table); |
| 271 | return 1; |
| 272 | |
| 273 | case 2: |
| 274 | set_color(palette+0, trans+0, colors[1], colors[1], colors[1], |
| 275 | colors[2], gamma_table); |
| 276 | return 1; |
| 277 | |
| 278 | case 3: |
| 279 | set_color(palette+0, trans+0, colors[1], colors[2], colors[3], 255, |
| 280 | gamma_table); |
| 281 | return 1; |
| 282 | |
| 283 | case 4: |
| 284 | set_color(palette+0, trans+0, colors[1], colors[2], colors[3], |
| 285 | colors[4], gamma_table); |
| 286 | return 1; |
| 287 | |
| 288 | case 0: |
| 289 | if (bit_depth == 1) |
| 290 | { |
| 291 | set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table); |
| 292 | set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table); |
| 293 | return 2; |
| 294 | } |
| 295 | |
| 296 | else |
| 297 | { |
| 298 | unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 299 | unsigned int x, y; |
| 300 | volatile unsigned int ip = 0; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 301 | |
| 302 | for (x=0; x<size; ++x) for (y=0; y<size; ++y) |
| 303 | { |
| 304 | ip = x + (size * y); |
| 305 | |
| 306 | /* size is at most 16, so the scaled value below fits in 16 bits |
| 307 | */ |
| 308 | # define interp(pos, c1, c2) ((pos * c1) + ((size-pos) * c2)) |
| 309 | # define xyinterp(x, y, c1, c2, c3, c4) (((size * size / 2) +\ |
| 310 | (interp(x, c1, c2) * y + (size-y) * interp(x, c3, c4))) /\ |
| 311 | (size*size)) |
| 312 | |
| 313 | set_color(palette+ip, trans+ip, |
| 314 | /* color: green, red,blue,white */ |
| 315 | xyinterp(x, y, 0, 255, 0, 255), |
| 316 | xyinterp(x, y, 255, 0, 0, 255), |
| 317 | xyinterp(x, y, 0, 0, 255, 255), |
| 318 | /* alpha: 0, 102, 204, 255) */ |
| 319 | xyinterp(x, y, 0, 102, 204, 255), |
| 320 | gamma_table); |
| 321 | } |
| 322 | |
| 323 | return ip+1; |
| 324 | } |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | static void |
| 329 | set_value(png_bytep row, size_t rowbytes, png_uint_32 x, unsigned int bit_depth, |
| 330 | png_uint_32 value, png_const_bytep gamma_table, double conv) |
| 331 | { |
| 332 | unsigned int mask = (1U << bit_depth)-1; |
| 333 | |
| 334 | x *= bit_depth; /* Maximum x is 4*1024, maximum bit_depth is 16 */ |
| 335 | |
| 336 | if (value <= mask) |
| 337 | { |
| 338 | png_uint_32 offset = x >> 3; |
| 339 | |
| 340 | if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes)) |
| 341 | { |
| 342 | row += offset; |
| 343 | |
| 344 | switch (bit_depth) |
| 345 | { |
| 346 | case 1: |
| 347 | case 2: |
| 348 | case 4: |
| 349 | /* Don't gamma correct - values get smashed */ |
| 350 | { |
| 351 | unsigned int shift = (8 - bit_depth) - (x & 0x7U); |
| 352 | |
| 353 | mask <<= shift; |
| 354 | value = (value << shift) & mask; |
| 355 | *row = (png_byte)((*row & ~mask) | value); |
| 356 | } |
| 357 | return; |
| 358 | |
| 359 | default: |
| 360 | fprintf(stderr, "makepng: bad bit depth (internal error)\n"); |
| 361 | exit(1); |
| 362 | |
| 363 | case 16: |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 364 | value = flooru(65535*pow(value/65535.,conv)+.5); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 365 | *row++ = (png_byte)(value >> 8); |
| 366 | *row = (png_byte)value; |
| 367 | return; |
| 368 | |
| 369 | case 8: |
| 370 | *row = gamma_table[value]; |
| 371 | return; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | else |
| 376 | { |
| 377 | fprintf(stderr, "makepng: row buffer overflow (internal error)\n"); |
| 378 | exit(1); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | else |
| 383 | { |
| 384 | fprintf(stderr, "makepng: component overflow (internal error)\n"); |
| 385 | exit(1); |
| 386 | } |
| 387 | } |
| 388 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 389 | static int /* filter mask for row */ |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 390 | generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type, |
| 391 | int bit_depth, png_const_bytep gamma_table, double conv, |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 392 | unsigned int *colors, int small) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 393 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 394 | int filters = 0; /* file *MASK*, 0 means the default, not NONE */ |
| 395 | png_uint_32 size_max = |
| 396 | image_size_of_type(color_type, bit_depth, colors, small)-1; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 397 | png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */ |
| 398 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 399 | if (colors[0] == 0) if (small) |
| 400 | { |
| 401 | unsigned int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
| 402 | |
| 403 | /* For pixel depths less than 16 generate a single row containing all the |
| 404 | * possible pixel values. For 16 generate all 65536 byte pair |
| 405 | * combinations in a 256x256 pixel array. |
| 406 | */ |
| 407 | switch (pixel_depth) |
| 408 | { |
| 409 | case 1: |
| 410 | assert(y == 0 && rowbytes == 1 && size_max == 1); |
| 411 | row[0] = 0x6CU; /* binary: 01101100, only top 2 bits used */ |
| 412 | filters = PNG_FILTER_NONE; |
| 413 | break; |
| 414 | |
| 415 | case 2: |
| 416 | assert(y == 0 && rowbytes == 1 && size_max == 3); |
| 417 | row[0] = 0x1BU; /* binary 00011011, all bits used */ |
| 418 | filters = PNG_FILTER_NONE; |
| 419 | break; |
| 420 | |
| 421 | case 4: |
| 422 | assert(y == 0 && rowbytes == 8 && size_max == 15); |
| 423 | row[0] = 0x01U; |
| 424 | row[1] = 0x23U; /* SUB gives 0x22U for all following bytes */ |
| 425 | row[2] = 0x45U; |
| 426 | row[3] = 0x67U; |
| 427 | row[4] = 0x89U; |
| 428 | row[5] = 0xABU; |
| 429 | row[6] = 0xCDU; |
| 430 | row[7] = 0xEFU; |
| 431 | filters = PNG_FILTER_SUB; |
| 432 | break; |
| 433 | |
| 434 | case 8: |
| 435 | /* The row will have all the pixel values in order starting with |
| 436 | * '1', the SUB filter will change every byte into '1' (including |
| 437 | * the last, which generates pixel value '0'). Since the SUB filter |
| 438 | * has value 1 this should result in maximum compression. |
| 439 | */ |
| 440 | assert(y == 0 && rowbytes == 256 && size_max == 255); |
| 441 | for (;;) |
| 442 | { |
| 443 | row[size_max] = 0xFFU & (size_max+1); |
| 444 | if (size_max == 0) |
| 445 | break; |
| 446 | --size_max; |
| 447 | } |
| 448 | filters = PNG_FILTER_SUB; |
| 449 | break; |
| 450 | |
| 451 | case 16: |
| 452 | /* Rows are generated such that each row has a constant difference |
| 453 | * between the first and second byte of each pixel and so that the |
| 454 | * difference increases by 1 at each row. The rows start with the |
| 455 | * first byte value of 0 and the value increases to 255 across the |
| 456 | * row. |
| 457 | * |
| 458 | * The difference starts at 1, so the first row is: |
| 459 | * |
| 460 | * 0 1 1 2 2 3 3 4 ... 254 255 255 0 |
| 461 | * |
| 462 | * This means that running the SUB filter on the first row produces: |
| 463 | * |
| 464 | * [SUB==1] 0 1 0 1 0 1... |
| 465 | * |
| 466 | * Then the difference is 2 on the next row, giving: |
| 467 | * |
| 468 | * 0 2 1 3 2 4 3 5 ... 254 0 255 1 |
| 469 | * |
| 470 | * When the UP filter is run on this libpng produces: |
| 471 | * |
| 472 | * [UP ==2] 0 1 0 1 0 1... |
| 473 | * |
| 474 | * And so on for all the remain rows to the final two * rows: |
| 475 | * |
| 476 | * row 254: 0 255 1 0 2 1 3 2 4 3 ... 254 253 255 254 |
| 477 | * row 255: 0 0 1 1 2 2 3 3 4 4 ... 254 254 255 255 |
| 478 | */ |
| 479 | assert(rowbytes == 512 && size_max == 255); |
| 480 | for (;;) |
| 481 | { |
| 482 | row[2*size_max ] = 0xFFU & size_max; |
| 483 | row[2*size_max+1] = 0xFFU & (size_max+y+1); |
| 484 | if (size_max == 0) |
| 485 | break; |
| 486 | --size_max; |
| 487 | } |
| 488 | /* The first row must include PNG_FILTER_UP so that libpng knows we |
| 489 | * need to keep it for the following row: |
| 490 | */ |
| 491 | filters = (y == 0 ? PNG_FILTER_SUB+PNG_FILTER_UP : PNG_FILTER_UP); |
| 492 | break; |
| 493 | |
| 494 | case 24: |
| 495 | case 32: |
| 496 | case 48: |
| 497 | case 64: |
| 498 | /* The rows are filled by an alogorithm similar to the above, in the |
| 499 | * first row pixel bytes are all equal, increasing from 0 by 1 for |
| 500 | * each pixel. In the second row the bytes within a pixel are |
| 501 | * incremented 1,3,5,7,... from the previous row byte. Using an odd |
| 502 | * number ensures all the possible byte values are used. |
| 503 | */ |
| 504 | assert(size_max == 255 && rowbytes == 256*(pixel_depth>>3)); |
| 505 | pixel_depth >>= 3; /* now in bytes */ |
| 506 | while (rowbytes > 0) |
| 507 | { |
| 508 | const size_t pixel_index = --rowbytes/pixel_depth; |
| 509 | |
| 510 | if (y == 0) |
| 511 | row[rowbytes] = 0xFFU & pixel_index; |
| 512 | |
| 513 | else |
| 514 | { |
| 515 | const size_t byte_offset = |
| 516 | rowbytes - pixel_index * pixel_depth; |
| 517 | |
| 518 | row[rowbytes] = |
| 519 | 0xFFU & (pixel_index + (byte_offset * 2*y) + 1); |
| 520 | } |
| 521 | } |
| 522 | filters = (y == 0 ? PNG_FILTER_SUB+PNG_FILTER_UP : PNG_FILTER_UP); |
| 523 | break; |
| 524 | |
| 525 | default: |
| 526 | assert(0/*NOT REACHED*/); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | else switch (channels_of_type(color_type)) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 531 | { |
| 532 | /* 1 channel: a square image with a diamond, the least luminous colors are on |
| 533 | * the edge of the image, the most luminous in the center. |
| 534 | */ |
| 535 | case 1: |
| 536 | { |
| 537 | png_uint_32 x; |
| 538 | png_uint_32 base = 2*size_max - abs(2*y-size_max); |
| 539 | |
| 540 | for (x=0; x<=size_max; ++x) |
| 541 | { |
| 542 | png_uint_32 luma = base - abs(2*x-size_max); |
| 543 | |
| 544 | /* 'luma' is now in the range 0..2*size_max, we need |
| 545 | * 0..depth_max |
| 546 | */ |
| 547 | luma = (luma*depth_max + size_max) / (2*size_max); |
| 548 | set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv); |
| 549 | } |
| 550 | } |
| 551 | break; |
| 552 | |
| 553 | /* 2 channels: the color channel increases in luminosity from top to bottom, |
| 554 | * the alpha channel increases in opacity from left to right. |
| 555 | */ |
| 556 | case 2: |
| 557 | { |
| 558 | png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 559 | png_uint_32 x; |
| 560 | |
| 561 | for (x=0; x<=size_max; ++x) |
| 562 | { |
| 563 | set_value(row, rowbytes, 2*x, bit_depth, |
| 564 | (depth_max * x * 2 + size_max) / (2 * size_max), gamma_table, |
| 565 | conv); |
| 566 | set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| 567 | conv); |
| 568 | } |
| 569 | } |
| 570 | break; |
| 571 | |
| 572 | /* 3 channels: linear combinations of, from the top-left corner clockwise, |
| 573 | * black, green, white, red. |
| 574 | */ |
| 575 | case 3: |
| 576 | { |
| 577 | /* x0: the black->red scale (the value of the red component) at the |
| 578 | * start of the row (blue and green are 0). |
| 579 | * x1: the green->white scale (the value of the red and blue |
| 580 | * components at the end of the row; green is depth_max). |
| 581 | */ |
| 582 | png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 583 | png_uint_32 x; |
| 584 | |
| 585 | /* Interpolate x/depth_max from start to end: |
| 586 | * |
| 587 | * start end difference |
| 588 | * red: Y Y 0 |
| 589 | * green: 0 depth_max depth_max |
| 590 | * blue: 0 Y Y |
| 591 | */ |
| 592 | for (x=0; x<=size_max; ++x) |
| 593 | { |
| 594 | set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y, |
| 595 | gamma_table, conv); |
| 596 | set_value(row, rowbytes, 3*x+1, bit_depth, /* green */ |
| 597 | (depth_max * x * 2 + size_max) / (2 * size_max), |
| 598 | gamma_table, conv); |
| 599 | set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */ |
| 600 | (Y * x * 2 + size_max) / (2 * size_max), |
| 601 | gamma_table, conv); |
| 602 | } |
| 603 | } |
| 604 | break; |
| 605 | |
| 606 | /* 4 channels: linear combinations of, from the top-left corner clockwise, |
| 607 | * transparent, red, green, blue. |
| 608 | */ |
| 609 | case 4: |
| 610 | { |
| 611 | /* x0: the transparent->blue scale (the value of the blue and alpha |
| 612 | * components) at the start of the row (red and green are 0). |
| 613 | * x1: the red->green scale (the value of the red and green |
| 614 | * components at the end of the row; blue is 0 and alpha is |
| 615 | * depth_max). |
| 616 | */ |
| 617 | png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 618 | png_uint_32 x; |
| 619 | |
| 620 | /* Interpolate x/depth_max from start to end: |
| 621 | * |
| 622 | * start end difference |
| 623 | * red: 0 depth_max-Y depth_max-Y |
| 624 | * green: 0 Y Y |
| 625 | * blue: Y 0 -Y |
| 626 | * alpha: Y depth_max depth_max-Y |
| 627 | */ |
| 628 | for (x=0; x<=size_max; ++x) |
| 629 | { |
| 630 | set_value(row, rowbytes, 4*x+0, bit_depth, /* red */ |
| 631 | ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| 632 | gamma_table, conv); |
| 633 | set_value(row, rowbytes, 4*x+1, bit_depth, /* green */ |
| 634 | (Y * x * 2 + size_max) / (2 * size_max), |
| 635 | gamma_table, conv); |
| 636 | set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */ |
| 637 | Y - (Y * x * 2 + size_max) / (2 * size_max), |
| 638 | gamma_table, conv); |
| 639 | set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */ |
| 640 | Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| 641 | gamma_table, conv); |
| 642 | } |
| 643 | } |
| 644 | break; |
| 645 | |
| 646 | default: |
| 647 | fprintf(stderr, "makepng: internal bad channel count\n"); |
| 648 | exit(2); |
| 649 | } |
| 650 | |
| 651 | else if (color_type & PNG_COLOR_MASK_PALETTE) |
| 652 | { |
| 653 | /* Palette with fixed color: the image rows are all 0 and the image width |
| 654 | * is 16. |
| 655 | */ |
| 656 | memset(row, 0, rowbytes); |
| 657 | } |
| 658 | |
| 659 | else if (colors[0] == channels_of_type(color_type)) |
| 660 | switch (channels_of_type(color_type)) |
| 661 | { |
| 662 | case 1: |
| 663 | { |
| 664 | const png_uint_32 luma = colors[1]; |
| 665 | png_uint_32 x; |
| 666 | |
| 667 | for (x=0; x<=size_max; ++x) |
| 668 | set_value(row, rowbytes, x, bit_depth, luma, gamma_table, |
| 669 | conv); |
| 670 | } |
| 671 | break; |
| 672 | |
| 673 | case 2: |
| 674 | { |
| 675 | const png_uint_32 luma = colors[1]; |
| 676 | const png_uint_32 alpha = colors[2]; |
| 677 | png_uint_32 x; |
| 678 | |
| 679 | for (x=0; x<size_max; ++x) |
| 680 | { |
| 681 | set_value(row, rowbytes, 2*x, bit_depth, luma, gamma_table, |
| 682 | conv); |
| 683 | set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| 684 | conv); |
| 685 | } |
| 686 | } |
| 687 | break; |
| 688 | |
| 689 | case 3: |
| 690 | { |
| 691 | const png_uint_32 red = colors[1]; |
| 692 | const png_uint_32 green = colors[2]; |
| 693 | const png_uint_32 blue = colors[3]; |
| 694 | png_uint_32 x; |
| 695 | |
| 696 | for (x=0; x<=size_max; ++x) |
| 697 | { |
| 698 | set_value(row, rowbytes, 3*x+0, bit_depth, red, gamma_table, |
| 699 | conv); |
| 700 | set_value(row, rowbytes, 3*x+1, bit_depth, green, gamma_table, |
| 701 | conv); |
| 702 | set_value(row, rowbytes, 3*x+2, bit_depth, blue, gamma_table, |
| 703 | conv); |
| 704 | } |
| 705 | } |
| 706 | break; |
| 707 | |
| 708 | case 4: |
| 709 | { |
| 710 | const png_uint_32 red = colors[1]; |
| 711 | const png_uint_32 green = colors[2]; |
| 712 | const png_uint_32 blue = colors[3]; |
| 713 | const png_uint_32 alpha = colors[4]; |
| 714 | png_uint_32 x; |
| 715 | |
| 716 | for (x=0; x<=size_max; ++x) |
| 717 | { |
| 718 | set_value(row, rowbytes, 4*x+0, bit_depth, red, gamma_table, |
| 719 | conv); |
| 720 | set_value(row, rowbytes, 4*x+1, bit_depth, green, gamma_table, |
| 721 | conv); |
| 722 | set_value(row, rowbytes, 4*x+2, bit_depth, blue, gamma_table, |
| 723 | conv); |
| 724 | set_value(row, rowbytes, 4*x+3, bit_depth, alpha, gamma_table, |
| 725 | conv); |
| 726 | } |
| 727 | } |
| 728 | break; |
| 729 | |
| 730 | default: |
| 731 | fprintf(stderr, "makepng: internal bad channel count\n"); |
| 732 | exit(2); |
| 733 | } |
| 734 | |
| 735 | else |
| 736 | { |
| 737 | fprintf(stderr, |
| 738 | "makepng: --color: count(%u) does not match channels(%u)\n", |
| 739 | colors[0], channels_of_type(color_type)); |
| 740 | exit(1); |
| 741 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 742 | |
| 743 | return filters; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | |
| 747 | static void PNGCBAPI |
| 748 | makepng_warning(png_structp png_ptr, png_const_charp message) |
| 749 | { |
| 750 | const char **ep = png_get_error_ptr(png_ptr); |
| 751 | const char *name; |
| 752 | |
| 753 | if (ep != NULL && *ep != NULL) |
| 754 | name = *ep; |
| 755 | |
| 756 | else |
| 757 | name = "makepng"; |
| 758 | |
| 759 | fprintf(stderr, "%s: warning: %s\n", name, message); |
| 760 | } |
| 761 | |
| 762 | static void PNGCBAPI |
| 763 | makepng_error(png_structp png_ptr, png_const_charp message) |
| 764 | { |
| 765 | makepng_warning(png_ptr, message); |
| 766 | png_longjmp(png_ptr, 1); |
| 767 | } |
| 768 | |
| 769 | static int /* 0 on success, else an error code */ |
| 770 | write_png(const char **name, FILE *fp, int color_type, int bit_depth, |
| 771 | volatile png_fixed_point gamma, chunk_insert * volatile insert, |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 772 | unsigned int filters, unsigned int *colors, int small, int tRNS) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 773 | { |
| 774 | png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, |
| 775 | name, makepng_error, makepng_warning); |
| 776 | volatile png_infop info_ptr = NULL; |
| 777 | volatile png_bytep row = NULL; |
| 778 | |
| 779 | if (png_ptr == NULL) |
| 780 | { |
| 781 | fprintf(stderr, "makepng: OOM allocating write structure\n"); |
| 782 | return 1; |
| 783 | } |
| 784 | |
| 785 | if (setjmp(png_jmpbuf(png_ptr))) |
| 786 | { |
| 787 | png_structp nv_ptr = png_ptr; |
| 788 | png_infop nv_info = info_ptr; |
| 789 | |
| 790 | png_ptr = NULL; |
| 791 | info_ptr = NULL; |
| 792 | png_destroy_write_struct(&nv_ptr, &nv_info); |
| 793 | if (row != NULL) free(row); |
| 794 | return 1; |
| 795 | } |
| 796 | |
| 797 | /* Allow benign errors so that we can write PNGs with errors */ |
| 798 | png_set_benign_errors(png_ptr, 1/*allowed*/); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 799 | |
| 800 | /* Max out the text compression level in an attempt to make the license |
| 801 | * small. If --small then do the same for the IDAT. |
| 802 | */ |
| 803 | if (small) |
| 804 | png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); |
| 805 | |
| 806 | png_set_text_compression_level(png_ptr, Z_BEST_COMPRESSION); |
| 807 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 808 | png_init_io(png_ptr, fp); |
| 809 | |
| 810 | info_ptr = png_create_info_struct(png_ptr); |
| 811 | if (info_ptr == NULL) |
| 812 | png_error(png_ptr, "OOM allocating info structure"); |
| 813 | |
| 814 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 815 | const unsigned int size = |
| 816 | image_size_of_type(color_type, bit_depth, colors, small); |
| 817 | unsigned int ysize; |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 818 | png_fixed_point real_gamma = 45455; /* For sRGB */ |
| 819 | png_byte gamma_table[256]; |
| 820 | double conv; |
| 821 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 822 | /* Normally images are square, but with 'small' we want to simply generate |
| 823 | * all the pixel values, or all that we reasonably can: |
| 824 | */ |
| 825 | if (small) |
| 826 | { |
| 827 | const unsigned int pixel_depth = |
| 828 | pixel_depth_of_type(color_type, bit_depth); |
| 829 | |
| 830 | if (pixel_depth <= 8U) |
| 831 | { |
| 832 | assert(size == (1U<<pixel_depth)); |
| 833 | ysize = 1U; |
| 834 | } |
| 835 | |
| 836 | else |
| 837 | { |
| 838 | assert(size == 256U); |
| 839 | ysize = 256U; |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | else |
| 844 | ysize = size; |
| 845 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 846 | /* This function uses the libpng values used on read to carry extra |
| 847 | * information about the gamma: |
| 848 | */ |
| 849 | if (gamma == PNG_GAMMA_MAC_18) |
| 850 | gamma = 65909; |
| 851 | |
| 852 | else if (gamma > 0 && gamma < 1000) |
| 853 | gamma = PNG_FP_1; |
| 854 | |
| 855 | if (gamma > 0) |
| 856 | real_gamma = gamma; |
| 857 | |
| 858 | { |
| 859 | unsigned int i; |
| 860 | |
| 861 | if (real_gamma == 45455) for (i=0; i<256; ++i) |
| 862 | { |
| 863 | gamma_table[i] = (png_byte)i; |
| 864 | conv = 1.; |
| 865 | } |
| 866 | |
| 867 | else |
| 868 | { |
| 869 | /* Convert 'i' from sRGB (45455) to real_gamma, this makes |
| 870 | * the images look the same regardless of the gAMA chunk. |
| 871 | */ |
| 872 | conv = real_gamma; |
| 873 | conv /= 45455; |
| 874 | |
| 875 | gamma_table[0] = 0; |
| 876 | |
| 877 | for (i=1; i<255; ++i) |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 878 | gamma_table[i] = floorb(pow(i/255.,conv) * 255 + .5); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 879 | |
| 880 | gamma_table[255] = 255; |
| 881 | } |
| 882 | } |
| 883 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 884 | png_set_IHDR(png_ptr, info_ptr, size, ysize, bit_depth, color_type, |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 885 | PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| 886 | |
| 887 | if (color_type & PNG_COLOR_MASK_PALETTE) |
| 888 | { |
| 889 | int npalette; |
| 890 | png_color palette[256]; |
| 891 | png_byte trans[256]; |
| 892 | |
| 893 | npalette = generate_palette(palette, trans, bit_depth, gamma_table, |
| 894 | colors); |
| 895 | png_set_PLTE(png_ptr, info_ptr, palette, npalette); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 896 | |
| 897 | if (tRNS) |
| 898 | png_set_tRNS(png_ptr, info_ptr, trans, npalette-1, |
| 899 | NULL/*transparent color*/); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 900 | |
| 901 | /* Reset gamma_table to prevent the image rows being changed */ |
| 902 | for (npalette=0; npalette<256; ++npalette) |
| 903 | gamma_table[npalette] = (png_byte)npalette; |
| 904 | } |
| 905 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 906 | else if (tRNS) |
| 907 | { |
| 908 | png_color_16 col; |
| 909 | |
| 910 | col.red = col.green = col.blue = col.gray = |
| 911 | 0x0101U & ((1U<<bit_depth)-1U); |
| 912 | col.index = 0U; |
| 913 | png_set_tRNS(png_ptr, info_ptr, NULL/*trans*/, 1U, &col); |
| 914 | } |
| 915 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 916 | if (gamma == PNG_DEFAULT_sRGB) |
| 917 | png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE); |
| 918 | |
| 919 | else if (gamma > 0) /* Else don't set color space information */ |
| 920 | { |
| 921 | png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma); |
| 922 | |
| 923 | /* Just use the sRGB values here. */ |
| 924 | png_set_cHRM_fixed(png_ptr, info_ptr, |
| 925 | /* color x y */ |
| 926 | /* white */ 31270, 32900, |
| 927 | /* red */ 64000, 33000, |
| 928 | /* green */ 30000, 60000, |
| 929 | /* blue */ 15000, 6000 |
| 930 | ); |
| 931 | } |
| 932 | |
| 933 | /* Insert extra information. */ |
| 934 | while (insert != NULL) |
| 935 | { |
| 936 | insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters); |
| 937 | insert = insert->next; |
| 938 | } |
| 939 | |
| 940 | /* Write the file header. */ |
| 941 | png_write_info(png_ptr, info_ptr); |
| 942 | |
| 943 | /* Restrict the filters */ |
| 944 | png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters); |
| 945 | |
| 946 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 947 | # ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| 948 | int passes = png_set_interlace_handling(png_ptr); |
| 949 | # else /* !WRITE_INTERLACING */ |
| 950 | int passes = 1; |
| 951 | # endif /* !WRITE_INTERLACING */ |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 952 | int pass; |
| 953 | png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); |
| 954 | |
| 955 | row = malloc(rowbytes); |
| 956 | |
| 957 | if (row == NULL) |
| 958 | png_error(png_ptr, "OOM allocating row buffer"); |
| 959 | |
| 960 | for (pass = 0; pass < passes; ++pass) |
| 961 | { |
| 962 | unsigned int y; |
| 963 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 964 | for (y=0; y<ysize; ++y) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 965 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 966 | unsigned int row_filters = |
| 967 | generate_row(row, rowbytes, y, color_type, bit_depth, |
| 968 | gamma_table, conv, colors, small); |
| 969 | |
| 970 | if (row_filters != 0 && filters == PNG_ALL_FILTERS) |
| 971 | png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, row_filters); |
| 972 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 973 | png_write_row(png_ptr, row); |
| 974 | } |
| 975 | } |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | /* Finish writing the file. */ |
| 980 | png_write_end(png_ptr, info_ptr); |
| 981 | |
| 982 | { |
| 983 | png_structp nv_ptr = png_ptr; |
| 984 | png_infop nv_info = info_ptr; |
| 985 | |
| 986 | png_ptr = NULL; |
| 987 | info_ptr = NULL; |
| 988 | png_destroy_write_struct(&nv_ptr, &nv_info); |
| 989 | } |
| 990 | free(row); |
| 991 | return 0; |
| 992 | } |
| 993 | |
| 994 | |
| 995 | static size_t |
| 996 | load_file(png_const_charp name, png_bytepp result) |
| 997 | { |
| 998 | FILE *fp = tmpfile(); |
| 999 | |
| 1000 | if (fp != NULL) |
| 1001 | { |
| 1002 | FILE *ip = fopen(name, "rb"); |
| 1003 | |
| 1004 | if (ip != NULL) |
| 1005 | { |
| 1006 | size_t total = 0; |
| 1007 | int ch; |
| 1008 | |
| 1009 | for (;;) |
| 1010 | { |
| 1011 | ch = getc(ip); |
| 1012 | if (ch == EOF) break; |
| 1013 | putc(ch, fp); |
| 1014 | ++total; |
| 1015 | } |
| 1016 | |
| 1017 | if (ferror(ip)) |
| 1018 | { |
| 1019 | perror(name); |
| 1020 | fprintf(stderr, "%s: read error\n", name); |
| 1021 | (void)fclose(ip); |
| 1022 | } |
| 1023 | |
| 1024 | else |
| 1025 | { |
| 1026 | (void)fclose(ip); |
| 1027 | |
| 1028 | if (ferror(fp)) |
| 1029 | { |
| 1030 | perror("temporary file"); |
| 1031 | fprintf(stderr, "temporary file write error\n"); |
| 1032 | } |
| 1033 | |
| 1034 | else |
| 1035 | { |
| 1036 | rewind(fp); |
| 1037 | |
| 1038 | if (total > 0) |
| 1039 | { |
| 1040 | /* Round up to a multiple of 4 here to allow an iCCP profile |
| 1041 | * to be padded to a 4x boundary. |
| 1042 | */ |
| 1043 | png_bytep data = malloc((total+3)&~3); |
| 1044 | |
| 1045 | if (data != NULL) |
| 1046 | { |
| 1047 | size_t new_size = 0; |
| 1048 | |
| 1049 | for (;;) |
| 1050 | { |
| 1051 | ch = getc(fp); |
| 1052 | if (ch == EOF) break; |
| 1053 | data[new_size++] = (png_byte)ch; |
| 1054 | } |
| 1055 | |
| 1056 | if (ferror(fp) || new_size != total) |
| 1057 | { |
| 1058 | perror("temporary file"); |
| 1059 | fprintf(stderr, "temporary file read error\n"); |
| 1060 | free(data); |
| 1061 | } |
| 1062 | |
| 1063 | else |
| 1064 | { |
| 1065 | (void)fclose(fp); |
| 1066 | *result = data; |
| 1067 | return total; |
| 1068 | } |
| 1069 | } |
| 1070 | |
| 1071 | else |
| 1072 | fprintf(stderr, "%s: out of memory loading file\n", name); |
| 1073 | } |
| 1074 | |
| 1075 | else |
| 1076 | fprintf(stderr, "%s: empty file\n", name); |
| 1077 | } |
| 1078 | } |
| 1079 | } |
| 1080 | |
| 1081 | else |
| 1082 | { |
| 1083 | perror(name); |
| 1084 | fprintf(stderr, "%s: open failed\n", name); |
| 1085 | } |
| 1086 | |
| 1087 | fclose(fp); |
| 1088 | } |
| 1089 | |
| 1090 | else |
| 1091 | fprintf(stderr, "makepng: %s: could not open temporary file\n", name); |
| 1092 | |
| 1093 | exit(1); |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | static png_size_t |
| 1098 | load_fake(png_charp param, png_bytepp profile) |
| 1099 | { |
| 1100 | char *endptr = NULL; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1101 | uint64_t size = strtoull(param, &endptr, 0/*base*/); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1102 | |
| 1103 | /* The 'fake' format is <number>*[string] */ |
| 1104 | if (endptr != NULL && *endptr == '*') |
| 1105 | { |
| 1106 | size_t len = strlen(++endptr); |
| 1107 | size_t result = (size_t)size; |
| 1108 | |
| 1109 | if (len == 0) len = 1; /* capture the terminating '\0' */ |
| 1110 | |
| 1111 | /* Now repeat that string to fill 'size' bytes. */ |
| 1112 | if (result == size && (*profile = malloc(result)) != NULL) |
| 1113 | { |
| 1114 | png_bytep out = *profile; |
| 1115 | |
| 1116 | if (len == 1) |
| 1117 | memset(out, *endptr, result); |
| 1118 | |
| 1119 | else |
| 1120 | { |
| 1121 | while (size >= len) |
| 1122 | { |
| 1123 | memcpy(out, endptr, len); |
| 1124 | out += len; |
| 1125 | size -= len; |
| 1126 | } |
| 1127 | memcpy(out, endptr, size); |
| 1128 | } |
| 1129 | |
| 1130 | return result; |
| 1131 | } |
| 1132 | |
| 1133 | else |
| 1134 | { |
| 1135 | fprintf(stderr, "%s: size exceeds system limits\n", param); |
| 1136 | exit(1); |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | return 0; |
| 1141 | } |
| 1142 | |
| 1143 | static void |
| 1144 | check_param_count(int nparams, int expect) |
| 1145 | { |
| 1146 | if (nparams != expect) |
| 1147 | { |
| 1148 | fprintf(stderr, "bad parameter count (internal error)\n"); |
| 1149 | exit(1); |
| 1150 | } |
| 1151 | } |
| 1152 | |
| 1153 | static void |
| 1154 | insert_iCCP(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1155 | png_charpp params) |
| 1156 | { |
| 1157 | png_bytep profile = NULL; |
| 1158 | png_uint_32 proflen = 0; |
| 1159 | int result; |
| 1160 | |
| 1161 | check_param_count(nparams, 2); |
| 1162 | |
| 1163 | switch (params[1][0]) |
| 1164 | { |
| 1165 | case '<': |
| 1166 | { |
| 1167 | png_size_t filelen = load_file(params[1]+1, &profile); |
| 1168 | if (filelen > 0xfffffffc) /* Maximum profile length */ |
| 1169 | { |
| 1170 | fprintf(stderr, "%s: file too long (%lu) for an ICC profile\n", |
| 1171 | params[1]+1, (unsigned long)filelen); |
| 1172 | exit(1); |
| 1173 | } |
| 1174 | |
| 1175 | proflen = (png_uint_32)filelen; |
| 1176 | } |
| 1177 | break; |
| 1178 | |
| 1179 | case '0': case '1': case '2': case '3': case '4': |
| 1180 | case '5': case '6': case '7': case '8': case '9': |
| 1181 | { |
| 1182 | png_size_t fake_len = load_fake(params[1], &profile); |
| 1183 | |
| 1184 | if (fake_len > 0) /* else a simple parameter */ |
| 1185 | { |
| 1186 | if (fake_len > 0xffffffff) /* Maximum profile length */ |
| 1187 | { |
| 1188 | fprintf(stderr, |
| 1189 | "%s: fake data too long (%lu) for an ICC profile\n", |
| 1190 | params[1], (unsigned long)fake_len); |
| 1191 | exit(1); |
| 1192 | } |
| 1193 | proflen = (png_uint_32)(fake_len & ~3U); |
| 1194 | /* Always fix up the profile length. */ |
| 1195 | png_save_uint_32(profile, proflen); |
| 1196 | break; |
| 1197 | } |
| 1198 | } |
| 1199 | |
| 1200 | default: |
| 1201 | fprintf(stderr, "--insert iCCP \"%s\": unrecognized\n", params[1]); |
| 1202 | fprintf(stderr, " use '<' to read a file: \"<filename\"\n"); |
| 1203 | exit(1); |
| 1204 | } |
| 1205 | |
| 1206 | result = 1; |
| 1207 | |
| 1208 | if (proflen & 3) |
| 1209 | { |
| 1210 | fprintf(stderr, |
| 1211 | "makepng: --insert iCCP %s: profile length made a multiple of 4\n", |
| 1212 | params[1]); |
| 1213 | |
| 1214 | /* load_file allocates extra space for this padding, the ICC spec requires |
| 1215 | * padding with zero bytes. |
| 1216 | */ |
| 1217 | while (proflen & 3) |
| 1218 | profile[proflen++] = 0; |
| 1219 | } |
| 1220 | |
| 1221 | if (profile != NULL && proflen > 3) |
| 1222 | { |
| 1223 | png_uint_32 prof_header = png_get_uint_32(profile); |
| 1224 | |
| 1225 | if (prof_header != proflen) |
| 1226 | { |
| 1227 | fprintf(stderr, "--insert iCCP %s: profile length field wrong:\n", |
| 1228 | params[1]); |
| 1229 | fprintf(stderr, " actual %lu, recorded value %lu (corrected)\n", |
| 1230 | (unsigned long)proflen, (unsigned long)prof_header); |
| 1231 | png_save_uint_32(profile, proflen); |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | if (result && profile != NULL && proflen >=4) |
| 1236 | png_set_iCCP(png_ptr, info_ptr, params[0], PNG_COMPRESSION_TYPE_BASE, |
| 1237 | profile, proflen); |
| 1238 | |
| 1239 | if (profile) |
| 1240 | free(profile); |
| 1241 | |
| 1242 | if (!result) |
| 1243 | exit(1); |
| 1244 | } |
| 1245 | |
| 1246 | static void |
| 1247 | clear_text(png_text *text, png_charp keyword) |
| 1248 | { |
| 1249 | text->compression = -1; /* none */ |
| 1250 | text->key = keyword; |
| 1251 | text->text = NULL; |
| 1252 | text->text_length = 0; /* libpng calculates this */ |
| 1253 | text->itxt_length = 0; /* libpng calculates this */ |
| 1254 | text->lang = NULL; |
| 1255 | text->lang_key = NULL; |
| 1256 | } |
| 1257 | |
| 1258 | static void |
| 1259 | set_text(png_structp png_ptr, png_infop info_ptr, png_textp text, |
| 1260 | png_charp param) |
| 1261 | { |
| 1262 | switch (param[0]) |
| 1263 | { |
| 1264 | case '<': |
| 1265 | { |
| 1266 | png_bytep file = NULL; |
| 1267 | |
| 1268 | text->text_length = load_file(param+1, &file); |
| 1269 | text->text = (png_charp)file; |
| 1270 | } |
| 1271 | break; |
| 1272 | |
| 1273 | case '0': case '1': case '2': case '3': case '4': |
| 1274 | case '5': case '6': case '7': case '8': case '9': |
| 1275 | { |
| 1276 | png_bytep data = NULL; |
| 1277 | png_size_t fake_len = load_fake(param, &data); |
| 1278 | |
| 1279 | if (fake_len > 0) /* else a simple parameter */ |
| 1280 | { |
| 1281 | text->text_length = fake_len; |
| 1282 | text->text = (png_charp)data; |
| 1283 | break; |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | default: |
| 1288 | text->text = param; |
| 1289 | break; |
| 1290 | } |
| 1291 | |
| 1292 | png_set_text(png_ptr, info_ptr, text, 1); |
| 1293 | |
| 1294 | if (text->text != param) |
| 1295 | free(text->text); |
| 1296 | } |
| 1297 | |
| 1298 | static void |
| 1299 | insert_tEXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1300 | png_charpp params) |
| 1301 | { |
| 1302 | png_text text; |
| 1303 | |
| 1304 | check_param_count(nparams, 2); |
| 1305 | clear_text(&text, params[0]); |
| 1306 | set_text(png_ptr, info_ptr, &text, params[1]); |
| 1307 | } |
| 1308 | |
| 1309 | static void |
| 1310 | insert_zTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1311 | png_charpp params) |
| 1312 | { |
| 1313 | png_text text; |
| 1314 | |
| 1315 | check_param_count(nparams, 2); |
| 1316 | clear_text(&text, params[0]); |
| 1317 | text.compression = 0; /* deflate */ |
| 1318 | set_text(png_ptr, info_ptr, &text, params[1]); |
| 1319 | } |
| 1320 | |
| 1321 | static void |
| 1322 | insert_iTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1323 | png_charpp params) |
| 1324 | { |
| 1325 | png_text text; |
| 1326 | |
| 1327 | check_param_count(nparams, 4); |
| 1328 | clear_text(&text, params[0]); |
| 1329 | text.compression = 2; /* iTXt + deflate */ |
| 1330 | text.lang = params[1];/* language tag */ |
| 1331 | text.lang_key = params[2]; /* translated keyword */ |
| 1332 | set_text(png_ptr, info_ptr, &text, params[3]); |
| 1333 | } |
| 1334 | |
| 1335 | static void |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1336 | insert_hIST(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1337 | png_charpp params) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1338 | { |
| 1339 | int i; |
| 1340 | png_uint_16 freq[256]; |
| 1341 | |
| 1342 | /* libpng takes the count from the PLTE count; we don't check it here but we |
| 1343 | * do set the array to 0 for unspecified entries. |
| 1344 | */ |
| 1345 | memset(freq, 0, sizeof freq); |
| 1346 | for (i=0; i<nparams; ++i) |
| 1347 | { |
| 1348 | char *endptr = NULL; |
| 1349 | unsigned long int l = strtoul(params[i], &endptr, 0/*base*/); |
| 1350 | |
| 1351 | if (params[i][0] && *endptr == 0 && l <= 65535) |
| 1352 | freq[i] = (png_uint_16)l; |
| 1353 | |
| 1354 | else |
| 1355 | { |
| 1356 | fprintf(stderr, "hIST[%d]: %s: invalid frequency\n", i, params[i]); |
| 1357 | exit(1); |
| 1358 | } |
| 1359 | } |
| 1360 | |
| 1361 | png_set_hIST(png_ptr, info_ptr, freq); |
| 1362 | } |
| 1363 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1364 | static png_byte |
| 1365 | bval(png_const_structrp png_ptr, png_charp param, unsigned int maxval) |
| 1366 | { |
| 1367 | char *endptr = NULL; |
| 1368 | unsigned long int l = strtoul(param, &endptr, 0/*base*/); |
| 1369 | |
| 1370 | if (param[0] && *endptr == 0 && l <= maxval) |
| 1371 | return (png_byte)l; |
| 1372 | |
| 1373 | else |
| 1374 | png_error(png_ptr, "sBIT: invalid sBIT value"); |
| 1375 | } |
| 1376 | |
| 1377 | static void |
| 1378 | insert_sBIT(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1379 | png_charpp params) |
| 1380 | { |
| 1381 | const int ct = png_get_color_type(png_ptr, info_ptr); |
| 1382 | const int c = (ct & PNG_COLOR_MASK_COLOR ? 3 : 1) + |
| 1383 | (ct & PNG_COLOR_MASK_ALPHA ? 1 : 0); |
| 1384 | const unsigned int maxval = |
| 1385 | ct & PNG_COLOR_MASK_PALETTE ? 8U : png_get_bit_depth(png_ptr, info_ptr); |
| 1386 | png_color_8 sBIT; |
| 1387 | |
| 1388 | if (nparams != c) |
| 1389 | png_error(png_ptr, "sBIT: incorrect parameter count"); |
| 1390 | |
| 1391 | if (ct & PNG_COLOR_MASK_COLOR) |
| 1392 | { |
| 1393 | sBIT.red = bval(png_ptr, params[0], maxval); |
| 1394 | sBIT.green = bval(png_ptr, params[1], maxval); |
| 1395 | sBIT.blue = bval(png_ptr, params[2], maxval); |
| 1396 | sBIT.gray = 42; |
| 1397 | } |
| 1398 | |
| 1399 | else |
| 1400 | { |
| 1401 | sBIT.red = sBIT.green = sBIT.blue = 42; |
| 1402 | sBIT.gray = bval(png_ptr, params[0], maxval); |
| 1403 | } |
| 1404 | |
| 1405 | if (ct & PNG_COLOR_MASK_ALPHA) |
| 1406 | sBIT.alpha = bval(png_ptr, params[nparams-1], maxval); |
| 1407 | |
| 1408 | else |
| 1409 | sBIT.alpha = 42; |
| 1410 | |
| 1411 | png_set_sBIT(png_ptr, info_ptr, &sBIT); |
| 1412 | } |
| 1413 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1414 | #if 0 |
| 1415 | static void |
| 1416 | insert_sPLT(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) |
| 1417 | { |
| 1418 | fprintf(stderr, "insert sPLT: NYI\n"); |
| 1419 | } |
| 1420 | #endif |
| 1421 | |
| 1422 | static int |
| 1423 | find_parameters(png_const_charp what, png_charp param, png_charp *list, |
| 1424 | int nparams) |
| 1425 | { |
| 1426 | /* Parameters are separated by '\n' or ':' characters, up to nparams are |
| 1427 | * accepted (more is an error) and the number found is returned. |
| 1428 | */ |
| 1429 | int i; |
| 1430 | for (i=0; *param && i<nparams; ++i) |
| 1431 | { |
| 1432 | list[i] = param; |
| 1433 | while (*++param) if (*param == '\n' || *param == ':') |
| 1434 | { |
| 1435 | *param++ = 0; /* Terminate last parameter */ |
| 1436 | break; /* And start a new one. */ |
| 1437 | } |
| 1438 | } |
| 1439 | |
| 1440 | if (*param) |
| 1441 | { |
| 1442 | fprintf(stderr, "--insert %s: too many parameters (%s)\n", what, param); |
| 1443 | exit(1); |
| 1444 | } |
| 1445 | |
| 1446 | list[i] = NULL; /* terminates list */ |
| 1447 | return i; /* number of parameters filled in */ |
| 1448 | } |
| 1449 | |
| 1450 | static void |
| 1451 | bad_parameter_count(png_const_charp what, int nparams) |
| 1452 | { |
| 1453 | fprintf(stderr, "--insert %s: bad parameter count %d\n", what, nparams); |
| 1454 | exit(1); |
| 1455 | } |
| 1456 | |
| 1457 | static chunk_insert * |
| 1458 | make_insert(png_const_charp what, |
| 1459 | void (*insert)(png_structp, png_infop, int, png_charpp), |
| 1460 | int nparams, png_charpp list) |
| 1461 | { |
| 1462 | int i; |
| 1463 | chunk_insert *cip; |
| 1464 | |
| 1465 | cip = malloc(offsetof(chunk_insert,parameters) + |
| 1466 | nparams * sizeof (png_charp)); |
| 1467 | |
| 1468 | if (cip == NULL) |
| 1469 | { |
| 1470 | fprintf(stderr, "--insert %s: out of memory allocating %d parameters\n", |
| 1471 | what, nparams); |
| 1472 | exit(1); |
| 1473 | } |
| 1474 | |
| 1475 | cip->next = NULL; |
| 1476 | cip->insert = insert; |
| 1477 | cip->nparams = nparams; |
| 1478 | for (i=0; i<nparams; ++i) |
| 1479 | cip->parameters[i] = list[i]; |
| 1480 | |
| 1481 | return cip; |
| 1482 | } |
| 1483 | |
| 1484 | static chunk_insert * |
| 1485 | find_insert(png_const_charp what, png_charp param) |
| 1486 | { |
| 1487 | png_uint_32 chunk = 0; |
| 1488 | png_charp parameter_list[1024]; |
| 1489 | int i, nparams; |
| 1490 | |
| 1491 | /* Assemble the chunk name */ |
| 1492 | for (i=0; i<4; ++i) |
| 1493 | { |
| 1494 | char ch = what[i]; |
| 1495 | |
| 1496 | if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)) |
| 1497 | chunk = (chunk << 8) + what[i]; |
| 1498 | |
| 1499 | else |
| 1500 | break; |
| 1501 | } |
| 1502 | |
| 1503 | if (i < 4 || what[4] != 0) |
| 1504 | { |
| 1505 | fprintf(stderr, "makepng --insert \"%s\": invalid chunk name\n", what); |
| 1506 | exit(1); |
| 1507 | } |
| 1508 | |
| 1509 | /* Assemble the parameter list. */ |
| 1510 | nparams = find_parameters(what, param, parameter_list, 1024); |
| 1511 | |
| 1512 | # define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d)) |
| 1513 | |
| 1514 | switch (chunk) |
| 1515 | { |
| 1516 | case CHUNK(105,67,67,80): /* iCCP */ |
| 1517 | if (nparams == 2) |
| 1518 | return make_insert(what, insert_iCCP, nparams, parameter_list); |
| 1519 | break; |
| 1520 | |
| 1521 | case CHUNK(116,69,88,116): /* tEXt */ |
| 1522 | if (nparams == 2) |
| 1523 | return make_insert(what, insert_tEXt, nparams, parameter_list); |
| 1524 | break; |
| 1525 | |
| 1526 | case CHUNK(122,84,88,116): /* zTXt */ |
| 1527 | if (nparams == 2) |
| 1528 | return make_insert(what, insert_zTXt, nparams, parameter_list); |
| 1529 | break; |
| 1530 | |
| 1531 | case CHUNK(105,84,88,116): /* iTXt */ |
| 1532 | if (nparams == 4) |
| 1533 | return make_insert(what, insert_iTXt, nparams, parameter_list); |
| 1534 | break; |
| 1535 | |
| 1536 | case CHUNK(104,73,83,84): /* hIST */ |
| 1537 | if (nparams <= 256) |
| 1538 | return make_insert(what, insert_hIST, nparams, parameter_list); |
| 1539 | break; |
| 1540 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1541 | case CHUNK(115,66,73,84): /* sBIT */ |
| 1542 | if (nparams <= 4) |
| 1543 | return make_insert(what, insert_sBIT, nparams, parameter_list); |
| 1544 | break; |
| 1545 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1546 | #if 0 |
| 1547 | case CHUNK(115,80,76,84): /* sPLT */ |
| 1548 | return make_insert(what, insert_sPLT, nparams, parameter_list); |
| 1549 | #endif |
| 1550 | |
| 1551 | default: |
| 1552 | fprintf(stderr, "makepng --insert \"%s\": unrecognized chunk name\n", |
| 1553 | what); |
| 1554 | exit(1); |
| 1555 | } |
| 1556 | |
| 1557 | bad_parameter_count(what, nparams); |
| 1558 | return NULL; |
| 1559 | } |
| 1560 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1561 | /* This is necessary because libpng expects writeable strings for things like |
| 1562 | * text chunks (maybe this should be fixed...) |
| 1563 | */ |
| 1564 | static png_charp |
| 1565 | strstash(png_const_charp foo) |
| 1566 | { |
| 1567 | /* The program indicates a memory allocation error by crashing, this is by |
| 1568 | * design. |
| 1569 | */ |
| 1570 | if (foo != NULL) |
| 1571 | { |
| 1572 | png_charp bar = malloc(strlen(foo)+1); |
| 1573 | return strcpy(bar, foo); |
| 1574 | } |
| 1575 | |
| 1576 | return NULL; |
| 1577 | } |
| 1578 | |
| 1579 | static png_charp |
| 1580 | strstash_list(const png_const_charp *text) |
| 1581 | { |
| 1582 | size_t foo = 0; |
| 1583 | png_charp result, bar; |
| 1584 | const png_const_charp *line = text; |
| 1585 | |
| 1586 | while (*line != NULL) |
| 1587 | foo += strlen(*line++); |
| 1588 | |
| 1589 | result = bar = malloc(foo+1); |
| 1590 | |
| 1591 | line = text; |
| 1592 | while (*line != NULL) |
| 1593 | { |
| 1594 | foo = strlen(*line); |
| 1595 | memcpy(bar, *line++, foo); |
| 1596 | bar += foo; |
| 1597 | } |
| 1598 | |
| 1599 | *bar = 0; |
| 1600 | return result; |
| 1601 | } |
| 1602 | |
| 1603 | /* These are used to insert Copyright and Licence fields, they allow the text to |
| 1604 | * have \n unlike the --insert option. |
| 1605 | */ |
| 1606 | static chunk_insert * |
| 1607 | add_tEXt(const char *key, const png_const_charp *text) |
| 1608 | { |
| 1609 | static char what[5] = { 116, 69, 88, 116, 0 }; |
| 1610 | png_charp parameter_list[3]; |
| 1611 | |
| 1612 | parameter_list[0] = strstash(key); |
| 1613 | parameter_list[1] = strstash_list(text); |
| 1614 | parameter_list[2] = NULL; |
| 1615 | |
| 1616 | return make_insert(what, insert_tEXt, 2, parameter_list); |
| 1617 | } |
| 1618 | |
| 1619 | static chunk_insert * |
| 1620 | add_iTXt(const char *key, const char *language, const char *language_key, |
| 1621 | const png_const_charp *text) |
| 1622 | { |
| 1623 | static char what[5] = { 105, 84, 88, 116, 0 }; |
| 1624 | png_charp parameter_list[5]; |
| 1625 | |
| 1626 | parameter_list[0] = strstash(key); |
| 1627 | parameter_list[1] = strstash(language); |
| 1628 | parameter_list[2] = strstash(language_key); |
| 1629 | parameter_list[3] = strstash_list(text); |
| 1630 | parameter_list[4] = NULL; |
| 1631 | |
| 1632 | return make_insert(what, insert_iTXt, 4, parameter_list); |
| 1633 | } |
| 1634 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1635 | /* This is a not-very-good parser for a sequence of numbers (including 0). It |
| 1636 | * doesn't accept some apparently valid things, but it accepts all the sensible |
| 1637 | * combinations. |
| 1638 | */ |
| 1639 | static void |
| 1640 | parse_color(char *arg, unsigned int *colors) |
| 1641 | { |
| 1642 | unsigned int ncolors = 0; |
| 1643 | |
| 1644 | while (*arg && ncolors < 4) |
| 1645 | { |
| 1646 | char *ep = arg; |
| 1647 | |
| 1648 | unsigned long ul = strtoul(arg, &ep, 0); |
| 1649 | |
| 1650 | if (ul > 65535) |
| 1651 | { |
| 1652 | fprintf(stderr, "makepng --color=...'%s': too big\n", arg); |
| 1653 | exit(1); |
| 1654 | } |
| 1655 | |
| 1656 | if (ep == arg) |
| 1657 | { |
| 1658 | fprintf(stderr, "makepng --color=...'%s': not a valid color\n", arg); |
| 1659 | exit(1); |
| 1660 | } |
| 1661 | |
| 1662 | if (*ep) ++ep; /* skip a separator */ |
| 1663 | arg = ep; |
| 1664 | |
| 1665 | colors[++ncolors] = (unsigned int)ul; /* checked above */ |
| 1666 | } |
| 1667 | |
| 1668 | if (*arg) |
| 1669 | { |
| 1670 | fprintf(stderr, "makepng --color=...'%s': too many values\n", arg); |
| 1671 | exit(1); |
| 1672 | } |
| 1673 | |
| 1674 | *colors = ncolors; |
| 1675 | } |
| 1676 | |
| 1677 | int |
| 1678 | main(int argc, char **argv) |
| 1679 | { |
| 1680 | FILE *fp = stdout; |
| 1681 | const char *file_name = NULL; |
| 1682 | int color_type = 8; /* invalid */ |
| 1683 | int bit_depth = 32; /* invalid */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1684 | int small = 0; /* make full size images */ |
| 1685 | int tRNS = 0; /* don't output a tRNS chunk */ |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1686 | unsigned int colors[5]; |
| 1687 | unsigned int filters = PNG_ALL_FILTERS; |
| 1688 | png_fixed_point gamma = 0; /* not set */ |
| 1689 | chunk_insert *head_insert = NULL; |
| 1690 | chunk_insert **insert_ptr = &head_insert; |
| 1691 | |
| 1692 | memset(colors, 0, sizeof colors); |
| 1693 | |
| 1694 | while (--argc > 0) |
| 1695 | { |
| 1696 | char *arg = *++argv; |
| 1697 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1698 | if (strcmp(arg, "--small") == 0) |
| 1699 | { |
| 1700 | small = 1; |
| 1701 | continue; |
| 1702 | } |
| 1703 | |
| 1704 | if (strcmp(arg, "--tRNS") == 0) |
| 1705 | { |
| 1706 | tRNS = 1; |
| 1707 | continue; |
| 1708 | } |
| 1709 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1710 | if (strcmp(arg, "--sRGB") == 0) |
| 1711 | { |
| 1712 | gamma = PNG_DEFAULT_sRGB; |
| 1713 | continue; |
| 1714 | } |
| 1715 | |
| 1716 | if (strcmp(arg, "--linear") == 0) |
| 1717 | { |
| 1718 | gamma = PNG_FP_1; |
| 1719 | continue; |
| 1720 | } |
| 1721 | |
| 1722 | if (strcmp(arg, "--1.8") == 0) |
| 1723 | { |
| 1724 | gamma = PNG_GAMMA_MAC_18; |
| 1725 | continue; |
| 1726 | } |
| 1727 | |
| 1728 | if (strcmp(arg, "--nofilters") == 0) |
| 1729 | { |
| 1730 | filters = PNG_FILTER_NONE; |
| 1731 | continue; |
| 1732 | } |
| 1733 | |
| 1734 | if (strncmp(arg, "--color=", 8) == 0) |
| 1735 | { |
| 1736 | parse_color(arg+8, colors); |
| 1737 | continue; |
| 1738 | } |
| 1739 | |
| 1740 | if (argc >= 3 && strcmp(arg, "--insert") == 0) |
| 1741 | { |
| 1742 | png_const_charp what = *++argv; |
| 1743 | png_charp param = *++argv; |
| 1744 | chunk_insert *new_insert; |
| 1745 | |
| 1746 | argc -= 2; |
| 1747 | |
| 1748 | new_insert = find_insert(what, param); |
| 1749 | |
| 1750 | if (new_insert != NULL) |
| 1751 | { |
| 1752 | *insert_ptr = new_insert; |
| 1753 | insert_ptr = &new_insert->next; |
| 1754 | } |
| 1755 | |
| 1756 | continue; |
| 1757 | } |
| 1758 | |
| 1759 | if (arg[0] == '-') |
| 1760 | { |
| 1761 | fprintf(stderr, "makepng: %s: invalid option\n", arg); |
| 1762 | exit(1); |
| 1763 | } |
| 1764 | |
| 1765 | if (strcmp(arg, "palette") == 0) |
| 1766 | { |
| 1767 | color_type = PNG_COLOR_TYPE_PALETTE; |
| 1768 | continue; |
| 1769 | } |
| 1770 | |
| 1771 | if (strncmp(arg, "gray", 4) == 0) |
| 1772 | { |
| 1773 | if (arg[4] == 0) |
| 1774 | { |
| 1775 | color_type = PNG_COLOR_TYPE_GRAY; |
| 1776 | continue; |
| 1777 | } |
| 1778 | |
| 1779 | else if (strcmp(arg+4, "a") == 0 || |
| 1780 | strcmp(arg+4, "alpha") == 0 || |
| 1781 | strcmp(arg+4, "-alpha") == 0) |
| 1782 | { |
| 1783 | color_type = PNG_COLOR_TYPE_GRAY_ALPHA; |
| 1784 | continue; |
| 1785 | } |
| 1786 | } |
| 1787 | |
| 1788 | if (strncmp(arg, "rgb", 3) == 0) |
| 1789 | { |
| 1790 | if (arg[3] == 0) |
| 1791 | { |
| 1792 | color_type = PNG_COLOR_TYPE_RGB; |
| 1793 | continue; |
| 1794 | } |
| 1795 | |
| 1796 | else if (strcmp(arg+3, "a") == 0 || |
| 1797 | strcmp(arg+3, "alpha") == 0 || |
| 1798 | strcmp(arg+3, "-alpha") == 0) |
| 1799 | { |
| 1800 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| 1801 | continue; |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | if (color_type == 8 && isdigit(arg[0])) |
| 1806 | { |
| 1807 | color_type = atoi(arg); |
| 1808 | if (color_type < 0 || color_type > 6 || color_type == 1 || |
| 1809 | color_type == 5) |
| 1810 | { |
| 1811 | fprintf(stderr, "makepng: %s: not a valid color type\n", arg); |
| 1812 | exit(1); |
| 1813 | } |
| 1814 | |
| 1815 | continue; |
| 1816 | } |
| 1817 | |
| 1818 | if (bit_depth == 32 && isdigit(arg[0])) |
| 1819 | { |
| 1820 | bit_depth = atoi(arg); |
| 1821 | if (bit_depth <= 0 || bit_depth > 16 || |
| 1822 | (bit_depth & -bit_depth) != bit_depth) |
| 1823 | { |
| 1824 | fprintf(stderr, "makepng: %s: not a valid bit depth\n", arg); |
| 1825 | exit(1); |
| 1826 | } |
| 1827 | |
| 1828 | continue; |
| 1829 | } |
| 1830 | |
| 1831 | if (argc == 1) /* It's the file name */ |
| 1832 | { |
| 1833 | fp = fopen(arg, "wb"); |
| 1834 | if (fp == NULL) |
| 1835 | { |
| 1836 | fprintf(stderr, "%s: %s: could not open\n", arg, strerror(errno)); |
| 1837 | exit(1); |
| 1838 | } |
| 1839 | |
| 1840 | file_name = arg; |
| 1841 | continue; |
| 1842 | } |
| 1843 | |
| 1844 | fprintf(stderr, "makepng: %s: unknown argument\n", arg); |
| 1845 | exit(1); |
| 1846 | } /* argument while loop */ |
| 1847 | |
| 1848 | if (color_type == 8 || bit_depth == 32) |
| 1849 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1850 | fprintf(stderr, "usage: makepng [--small] [--sRGB|--linear|--1.8] " |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1851 | "[--color=...] color-type bit-depth [file-name]\n" |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1852 | " Make a test PNG file, by default writes to stdout.\n" |
| 1853 | " Other options are available, UTSL.\n"); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1854 | exit(1); |
| 1855 | } |
| 1856 | |
| 1857 | /* Check the colors */ |
| 1858 | { |
| 1859 | const unsigned int lim = (color_type == PNG_COLOR_TYPE_PALETTE ? 255U : |
| 1860 | (1U<<bit_depth)-1); |
| 1861 | unsigned int i; |
| 1862 | |
| 1863 | for (i=1; i<=colors[0]; ++i) |
| 1864 | if (colors[i] > lim) |
| 1865 | { |
| 1866 | fprintf(stderr, "makepng: --color=...: %u out of range [0..%u]\n", |
| 1867 | colors[i], lim); |
| 1868 | exit(1); |
| 1869 | } |
| 1870 | } |
| 1871 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1872 | /* small and colors are incomparible (will probably crash if both are used at |
| 1873 | * the same time!) |
| 1874 | */ |
| 1875 | if (small && colors[0] != 0) |
| 1876 | { |
| 1877 | fprintf(stderr, "makepng: --color --small: only one at a time!\n"); |
| 1878 | exit(1); |
| 1879 | } |
| 1880 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1881 | /* Restrict the filters for more speed to those we know are used for the |
| 1882 | * generated images. |
| 1883 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1884 | if (filters == PNG_ALL_FILTERS && !small/*small provides defaults*/) |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1885 | { |
| 1886 | if ((color_type & PNG_COLOR_MASK_PALETTE) != 0 || bit_depth < 8) |
| 1887 | filters = PNG_FILTER_NONE; |
| 1888 | |
| 1889 | else if (color_type & PNG_COLOR_MASK_COLOR) /* rgb */ |
| 1890 | { |
| 1891 | if (bit_depth == 8) |
| 1892 | filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG); |
| 1893 | |
| 1894 | else |
| 1895 | filters = PNG_FILTER_SUB | PNG_FILTER_PAETH; |
| 1896 | } |
| 1897 | |
| 1898 | else /* gray 8 or 16-bit */ |
| 1899 | filters &= ~PNG_FILTER_NONE; |
| 1900 | } |
| 1901 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1902 | /* Insert standard copyright and licence text. */ |
| 1903 | { |
| 1904 | static png_const_charp copyright[] = |
| 1905 | { |
| 1906 | COPYRIGHT, /* ISO-Latin-1 */ |
| 1907 | NULL |
| 1908 | }; |
| 1909 | static png_const_charp licensing[] = |
| 1910 | { |
| 1911 | IMAGE_LICENSING, /* UTF-8 */ |
| 1912 | NULL |
| 1913 | }; |
| 1914 | |
| 1915 | chunk_insert *new_insert; |
| 1916 | |
| 1917 | new_insert = add_tEXt("Copyright", copyright); |
| 1918 | if (new_insert != NULL) |
| 1919 | { |
| 1920 | *insert_ptr = new_insert; |
| 1921 | insert_ptr = &new_insert->next; |
| 1922 | } |
| 1923 | |
| 1924 | new_insert = add_iTXt("Licensing", "en", NULL, licensing); |
| 1925 | if (new_insert != NULL) |
| 1926 | { |
| 1927 | *insert_ptr = new_insert; |
| 1928 | insert_ptr = &new_insert->next; |
| 1929 | } |
| 1930 | } |
| 1931 | |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1932 | { |
| 1933 | int ret = write_png(&file_name, fp, color_type, bit_depth, gamma, |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame] | 1934 | head_insert, filters, colors, small, tRNS); |
Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1935 | |
| 1936 | if (ret != 0 && file_name != NULL) |
| 1937 | remove(file_name); |
| 1938 | |
| 1939 | return ret; |
| 1940 | } |
| 1941 | } |