Chris Craik | ca2bf81 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1 | /* makepng.c |
| 2 | * |
| 3 | * Copyright (c) 2013 John Cunningham Bowler |
| 4 | * |
| 5 | * Last changed in libpng 1.6.1 [March 28, 2013] |
| 6 | * |
| 7 | * This code is released under the libpng license. |
| 8 | * For conditions of distribution and use, see the disclaimer |
| 9 | * and license in png.h |
| 10 | * |
| 11 | * Make a test PNG image. The arguments are as follows: |
| 12 | * |
| 13 | * makepng [--sRGB|--linear|--1.8] [--color=<color>] color-type bit-depth \ |
| 14 | * [file-name] |
| 15 | * |
| 16 | * The color-type may be numeric (and must match the numbers used by the PNG |
| 17 | * specification) or one of the format names listed below. The bit-depth is the |
| 18 | * component bit depth, or the pixel bit-depth for a color-mapped image. |
| 19 | * |
| 20 | * Without any options no color-space information is written, with the options |
| 21 | * an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the |
| 22 | * display system used on older Apple computers to correct for high ambient |
| 23 | * light levels in the viewing environment; it applies a transform of |
| 24 | * approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909 |
| 25 | * is written (1.45/2.2). |
| 26 | * |
| 27 | * The image data is generated internally. Unless --color is given the images |
| 28 | * used are as follows: |
| 29 | * |
| 30 | * 1 channel: a square image with a diamond, the least luminous colors are on |
| 31 | * the edge of the image, the most luminous in the center. |
| 32 | * |
| 33 | * 2 channels: the color channel increases in luminosity from top to bottom, the |
| 34 | * alpha channel increases in opacity from left to right. |
| 35 | * |
| 36 | * 3 channels: linear combinations of, from the top-left corner clockwise, |
| 37 | * black, green, white, red. |
| 38 | * |
| 39 | * 4 channels: linear combinations of, from the top-left corner clockwise, |
| 40 | * transparent, red, green, blue. |
| 41 | * |
| 42 | * For color-mapped images a four channel color-map is used and the PNG file has |
| 43 | * a tRNS chunk, as follows: |
| 44 | * |
| 45 | * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| 46 | * 2-bit: entry 0: transparent-green |
| 47 | * entry 1: 40%-red |
| 48 | * entry 2: 80%-blue |
| 49 | * entry 3: opaque-white |
| 50 | * 4-bit: the 16 combinations of the 2-bit case |
| 51 | * 8-bit: the 256 combinations of the 4-bit case |
| 52 | * |
| 53 | * The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The |
| 54 | * image is the 1-channel diamond, but using palette index, not luminosity. |
| 55 | * |
| 56 | * Image size is determined by the final pixel depth in bits, i.e. channels x |
| 57 | * bit-depth, as follows: |
| 58 | * |
| 59 | * 8 bits or less: 64x64 |
| 60 | * 16 bits: 256x256 |
| 61 | * More than 16 bits: 1024x1024 |
| 62 | * |
| 63 | * Row filtering is turned off (the 'none' filter is used on every row) and the |
| 64 | * images are not interlaced. |
| 65 | * |
| 66 | * If --color is given then the whole image has that color, color-mapped images |
| 67 | * will have exactly one palette entry and all image files with be 16x16 in |
| 68 | * size. The color value is 1 to 4 decimal numbers as appropriate for the color |
| 69 | * type. |
| 70 | * |
| 71 | * If file-name is given then the PNG is written to that file, else it is |
| 72 | * written to stdout. Notice that stdout is not supported on systems where, by |
| 73 | * default, it assumes text output; this program makes no attempt to change the |
| 74 | * text mode of stdout! |
| 75 | */ |
| 76 | #define _ISOC99_SOURCE /* for strtoull */ |
| 77 | |
| 78 | #include <stddef.h> /* for offsetof */ |
| 79 | #include <stdlib.h> |
| 80 | #include <stdio.h> |
| 81 | #include <string.h> |
| 82 | #include <ctype.h> |
| 83 | #include <math.h> |
| 84 | #include <errno.h> |
| 85 | |
| 86 | #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) |
| 87 | # include <config.h> |
| 88 | #endif |
| 89 | |
| 90 | /* Define the following to use this test against your installed libpng, rather |
| 91 | * than the one being built here: |
| 92 | */ |
| 93 | #ifdef PNG_FREESTANDING_TESTS |
| 94 | # include <png.h> |
| 95 | #else |
| 96 | # include "../../png.h" |
| 97 | #endif |
| 98 | |
| 99 | /* This structure is used for inserting extra chunks (the --insert argument, not |
| 100 | * documented above.) |
| 101 | */ |
| 102 | typedef struct chunk_insert |
| 103 | { |
| 104 | struct chunk_insert *next; |
| 105 | void (*insert)(png_structp, png_infop, int, png_charpp); |
| 106 | int nparams; |
| 107 | png_charp parameters[1]; |
| 108 | } chunk_insert; |
| 109 | |
| 110 | static int |
| 111 | channels_of_type(int color_type) |
| 112 | { |
| 113 | if (color_type & PNG_COLOR_MASK_PALETTE) |
| 114 | return 1; |
| 115 | |
| 116 | else |
| 117 | { |
| 118 | int channels = 1; |
| 119 | |
| 120 | if (color_type & PNG_COLOR_MASK_COLOR) |
| 121 | channels = 3; |
| 122 | |
| 123 | if (color_type & PNG_COLOR_MASK_ALPHA) |
| 124 | return channels + 1; |
| 125 | |
| 126 | else |
| 127 | return channels; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | static int |
| 132 | pixel_depth_of_type(int color_type, int bit_depth) |
| 133 | { |
| 134 | return channels_of_type(color_type) * bit_depth; |
| 135 | } |
| 136 | |
| 137 | static unsigned int |
| 138 | image_size_of_type(int color_type, int bit_depth, unsigned int *colors) |
| 139 | { |
| 140 | if (*colors) |
| 141 | return 16; |
| 142 | |
| 143 | else |
| 144 | { |
| 145 | int pixel_depth = pixel_depth_of_type(color_type, bit_depth); |
| 146 | |
| 147 | if (pixel_depth < 8) |
| 148 | return 64; |
| 149 | |
| 150 | else if (pixel_depth > 16) |
| 151 | return 1024; |
| 152 | |
| 153 | else |
| 154 | return 256; |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | static void |
| 159 | set_color(png_colorp color, png_bytep trans, unsigned int red, |
| 160 | unsigned int green, unsigned int blue, unsigned int alpha, |
| 161 | png_const_bytep gamma_table) |
| 162 | { |
| 163 | color->red = gamma_table[red]; |
| 164 | color->green = gamma_table[green]; |
| 165 | color->blue = gamma_table[blue]; |
| 166 | *trans = (png_byte)alpha; |
| 167 | } |
| 168 | |
| 169 | static int |
| 170 | generate_palette(png_colorp palette, png_bytep trans, int bit_depth, |
| 171 | png_const_bytep gamma_table, unsigned int *colors) |
| 172 | { |
| 173 | /* |
| 174 | * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white |
| 175 | * 2-bit: entry 0: transparent-green |
| 176 | * entry 1: 40%-red |
| 177 | * entry 2: 80%-blue |
| 178 | * entry 3: opaque-white |
| 179 | * 4-bit: the 16 combinations of the 2-bit case |
| 180 | * 8-bit: the 256 combinations of the 4-bit case |
| 181 | */ |
| 182 | switch (colors[0]) |
| 183 | { |
| 184 | default: |
| 185 | fprintf(stderr, "makepng: --colors=...: invalid count %u\n", |
| 186 | colors[0]); |
| 187 | exit(1); |
| 188 | |
| 189 | case 1: |
| 190 | set_color(palette+0, trans+0, colors[1], colors[1], colors[1], 255, |
| 191 | gamma_table); |
| 192 | return 1; |
| 193 | |
| 194 | case 2: |
| 195 | set_color(palette+0, trans+0, colors[1], colors[1], colors[1], |
| 196 | colors[2], gamma_table); |
| 197 | return 1; |
| 198 | |
| 199 | case 3: |
| 200 | set_color(palette+0, trans+0, colors[1], colors[2], colors[3], 255, |
| 201 | gamma_table); |
| 202 | return 1; |
| 203 | |
| 204 | case 4: |
| 205 | set_color(palette+0, trans+0, colors[1], colors[2], colors[3], |
| 206 | colors[4], gamma_table); |
| 207 | return 1; |
| 208 | |
| 209 | case 0: |
| 210 | if (bit_depth == 1) |
| 211 | { |
| 212 | set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table); |
| 213 | set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table); |
| 214 | return 2; |
| 215 | } |
| 216 | |
| 217 | else |
| 218 | { |
| 219 | unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */ |
| 220 | unsigned int x, y, ip; |
| 221 | |
| 222 | for (x=0; x<size; ++x) for (y=0; y<size; ++y) |
| 223 | { |
| 224 | ip = x + (size * y); |
| 225 | |
| 226 | /* size is at most 16, so the scaled value below fits in 16 bits |
| 227 | */ |
| 228 | # define interp(pos, c1, c2) ((pos * c1) + ((size-pos) * c2)) |
| 229 | # define xyinterp(x, y, c1, c2, c3, c4) (((size * size / 2) +\ |
| 230 | (interp(x, c1, c2) * y + (size-y) * interp(x, c3, c4))) /\ |
| 231 | (size*size)) |
| 232 | |
| 233 | set_color(palette+ip, trans+ip, |
| 234 | /* color: green, red,blue,white */ |
| 235 | xyinterp(x, y, 0, 255, 0, 255), |
| 236 | xyinterp(x, y, 255, 0, 0, 255), |
| 237 | xyinterp(x, y, 0, 0, 255, 255), |
| 238 | /* alpha: 0, 102, 204, 255) */ |
| 239 | xyinterp(x, y, 0, 102, 204, 255), |
| 240 | gamma_table); |
| 241 | } |
| 242 | |
| 243 | return ip+1; |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void |
| 249 | set_value(png_bytep row, size_t rowbytes, png_uint_32 x, unsigned int bit_depth, |
| 250 | png_uint_32 value, png_const_bytep gamma_table, double conv) |
| 251 | { |
| 252 | unsigned int mask = (1U << bit_depth)-1; |
| 253 | |
| 254 | x *= bit_depth; /* Maximum x is 4*1024, maximum bit_depth is 16 */ |
| 255 | |
| 256 | if (value <= mask) |
| 257 | { |
| 258 | png_uint_32 offset = x >> 3; |
| 259 | |
| 260 | if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes)) |
| 261 | { |
| 262 | row += offset; |
| 263 | |
| 264 | switch (bit_depth) |
| 265 | { |
| 266 | case 1: |
| 267 | case 2: |
| 268 | case 4: |
| 269 | /* Don't gamma correct - values get smashed */ |
| 270 | { |
| 271 | unsigned int shift = (8 - bit_depth) - (x & 0x7U); |
| 272 | |
| 273 | mask <<= shift; |
| 274 | value = (value << shift) & mask; |
| 275 | *row = (png_byte)((*row & ~mask) | value); |
| 276 | } |
| 277 | return; |
| 278 | |
| 279 | default: |
| 280 | fprintf(stderr, "makepng: bad bit depth (internal error)\n"); |
| 281 | exit(1); |
| 282 | |
| 283 | case 16: |
| 284 | value = (unsigned int)floor(65535*pow(value/65535.,conv)+.5); |
| 285 | *row++ = (png_byte)(value >> 8); |
| 286 | *row = (png_byte)value; |
| 287 | return; |
| 288 | |
| 289 | case 8: |
| 290 | *row = gamma_table[value]; |
| 291 | return; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | else |
| 296 | { |
| 297 | fprintf(stderr, "makepng: row buffer overflow (internal error)\n"); |
| 298 | exit(1); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | else |
| 303 | { |
| 304 | fprintf(stderr, "makepng: component overflow (internal error)\n"); |
| 305 | exit(1); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | static void |
| 310 | generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type, |
| 311 | int bit_depth, png_const_bytep gamma_table, double conv, |
| 312 | unsigned int *colors) |
| 313 | { |
| 314 | png_uint_32 size_max = image_size_of_type(color_type, bit_depth, colors)-1; |
| 315 | png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */ |
| 316 | |
| 317 | if (colors[0] == 0) switch (channels_of_type(color_type)) |
| 318 | { |
| 319 | /* 1 channel: a square image with a diamond, the least luminous colors are on |
| 320 | * the edge of the image, the most luminous in the center. |
| 321 | */ |
| 322 | case 1: |
| 323 | { |
| 324 | png_uint_32 x; |
| 325 | png_uint_32 base = 2*size_max - abs(2*y-size_max); |
| 326 | |
| 327 | for (x=0; x<=size_max; ++x) |
| 328 | { |
| 329 | png_uint_32 luma = base - abs(2*x-size_max); |
| 330 | |
| 331 | /* 'luma' is now in the range 0..2*size_max, we need |
| 332 | * 0..depth_max |
| 333 | */ |
| 334 | luma = (luma*depth_max + size_max) / (2*size_max); |
| 335 | set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv); |
| 336 | } |
| 337 | } |
| 338 | break; |
| 339 | |
| 340 | /* 2 channels: the color channel increases in luminosity from top to bottom, |
| 341 | * the alpha channel increases in opacity from left to right. |
| 342 | */ |
| 343 | case 2: |
| 344 | { |
| 345 | png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 346 | png_uint_32 x; |
| 347 | |
| 348 | for (x=0; x<=size_max; ++x) |
| 349 | { |
| 350 | set_value(row, rowbytes, 2*x, bit_depth, |
| 351 | (depth_max * x * 2 + size_max) / (2 * size_max), gamma_table, |
| 352 | conv); |
| 353 | set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| 354 | conv); |
| 355 | } |
| 356 | } |
| 357 | break; |
| 358 | |
| 359 | /* 3 channels: linear combinations of, from the top-left corner clockwise, |
| 360 | * black, green, white, red. |
| 361 | */ |
| 362 | case 3: |
| 363 | { |
| 364 | /* x0: the black->red scale (the value of the red component) at the |
| 365 | * start of the row (blue and green are 0). |
| 366 | * x1: the green->white scale (the value of the red and blue |
| 367 | * components at the end of the row; green is depth_max). |
| 368 | */ |
| 369 | png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 370 | png_uint_32 x; |
| 371 | |
| 372 | /* Interpolate x/depth_max from start to end: |
| 373 | * |
| 374 | * start end difference |
| 375 | * red: Y Y 0 |
| 376 | * green: 0 depth_max depth_max |
| 377 | * blue: 0 Y Y |
| 378 | */ |
| 379 | for (x=0; x<=size_max; ++x) |
| 380 | { |
| 381 | set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y, |
| 382 | gamma_table, conv); |
| 383 | set_value(row, rowbytes, 3*x+1, bit_depth, /* green */ |
| 384 | (depth_max * x * 2 + size_max) / (2 * size_max), |
| 385 | gamma_table, conv); |
| 386 | set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */ |
| 387 | (Y * x * 2 + size_max) / (2 * size_max), |
| 388 | gamma_table, conv); |
| 389 | } |
| 390 | } |
| 391 | break; |
| 392 | |
| 393 | /* 4 channels: linear combinations of, from the top-left corner clockwise, |
| 394 | * transparent, red, green, blue. |
| 395 | */ |
| 396 | case 4: |
| 397 | { |
| 398 | /* x0: the transparent->blue scale (the value of the blue and alpha |
| 399 | * components) at the start of the row (red and green are 0). |
| 400 | * x1: the red->green scale (the value of the red and green |
| 401 | * components at the end of the row; blue is 0 and alpha is |
| 402 | * depth_max). |
| 403 | */ |
| 404 | png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); |
| 405 | png_uint_32 x; |
| 406 | |
| 407 | /* Interpolate x/depth_max from start to end: |
| 408 | * |
| 409 | * start end difference |
| 410 | * red: 0 depth_max-Y depth_max-Y |
| 411 | * green: 0 Y Y |
| 412 | * blue: Y 0 -Y |
| 413 | * alpha: Y depth_max depth_max-Y |
| 414 | */ |
| 415 | for (x=0; x<=size_max; ++x) |
| 416 | { |
| 417 | set_value(row, rowbytes, 4*x+0, bit_depth, /* red */ |
| 418 | ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| 419 | gamma_table, conv); |
| 420 | set_value(row, rowbytes, 4*x+1, bit_depth, /* green */ |
| 421 | (Y * x * 2 + size_max) / (2 * size_max), |
| 422 | gamma_table, conv); |
| 423 | set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */ |
| 424 | Y - (Y * x * 2 + size_max) / (2 * size_max), |
| 425 | gamma_table, conv); |
| 426 | set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */ |
| 427 | Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), |
| 428 | gamma_table, conv); |
| 429 | } |
| 430 | } |
| 431 | break; |
| 432 | |
| 433 | default: |
| 434 | fprintf(stderr, "makepng: internal bad channel count\n"); |
| 435 | exit(2); |
| 436 | } |
| 437 | |
| 438 | else if (color_type & PNG_COLOR_MASK_PALETTE) |
| 439 | { |
| 440 | /* Palette with fixed color: the image rows are all 0 and the image width |
| 441 | * is 16. |
| 442 | */ |
| 443 | memset(row, 0, rowbytes); |
| 444 | } |
| 445 | |
| 446 | else if (colors[0] == channels_of_type(color_type)) |
| 447 | switch (channels_of_type(color_type)) |
| 448 | { |
| 449 | case 1: |
| 450 | { |
| 451 | const png_uint_32 luma = colors[1]; |
| 452 | png_uint_32 x; |
| 453 | |
| 454 | for (x=0; x<=size_max; ++x) |
| 455 | set_value(row, rowbytes, x, bit_depth, luma, gamma_table, |
| 456 | conv); |
| 457 | } |
| 458 | break; |
| 459 | |
| 460 | case 2: |
| 461 | { |
| 462 | const png_uint_32 luma = colors[1]; |
| 463 | const png_uint_32 alpha = colors[2]; |
| 464 | png_uint_32 x; |
| 465 | |
| 466 | for (x=0; x<size_max; ++x) |
| 467 | { |
| 468 | set_value(row, rowbytes, 2*x, bit_depth, luma, gamma_table, |
| 469 | conv); |
| 470 | set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, |
| 471 | conv); |
| 472 | } |
| 473 | } |
| 474 | break; |
| 475 | |
| 476 | case 3: |
| 477 | { |
| 478 | const png_uint_32 red = colors[1]; |
| 479 | const png_uint_32 green = colors[2]; |
| 480 | const png_uint_32 blue = colors[3]; |
| 481 | png_uint_32 x; |
| 482 | |
| 483 | for (x=0; x<=size_max; ++x) |
| 484 | { |
| 485 | set_value(row, rowbytes, 3*x+0, bit_depth, red, gamma_table, |
| 486 | conv); |
| 487 | set_value(row, rowbytes, 3*x+1, bit_depth, green, gamma_table, |
| 488 | conv); |
| 489 | set_value(row, rowbytes, 3*x+2, bit_depth, blue, gamma_table, |
| 490 | conv); |
| 491 | } |
| 492 | } |
| 493 | break; |
| 494 | |
| 495 | case 4: |
| 496 | { |
| 497 | const png_uint_32 red = colors[1]; |
| 498 | const png_uint_32 green = colors[2]; |
| 499 | const png_uint_32 blue = colors[3]; |
| 500 | const png_uint_32 alpha = colors[4]; |
| 501 | png_uint_32 x; |
| 502 | |
| 503 | for (x=0; x<=size_max; ++x) |
| 504 | { |
| 505 | set_value(row, rowbytes, 4*x+0, bit_depth, red, gamma_table, |
| 506 | conv); |
| 507 | set_value(row, rowbytes, 4*x+1, bit_depth, green, gamma_table, |
| 508 | conv); |
| 509 | set_value(row, rowbytes, 4*x+2, bit_depth, blue, gamma_table, |
| 510 | conv); |
| 511 | set_value(row, rowbytes, 4*x+3, bit_depth, alpha, gamma_table, |
| 512 | conv); |
| 513 | } |
| 514 | } |
| 515 | break; |
| 516 | |
| 517 | default: |
| 518 | fprintf(stderr, "makepng: internal bad channel count\n"); |
| 519 | exit(2); |
| 520 | } |
| 521 | |
| 522 | else |
| 523 | { |
| 524 | fprintf(stderr, |
| 525 | "makepng: --color: count(%u) does not match channels(%u)\n", |
| 526 | colors[0], channels_of_type(color_type)); |
| 527 | exit(1); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | |
| 532 | static void PNGCBAPI |
| 533 | makepng_warning(png_structp png_ptr, png_const_charp message) |
| 534 | { |
| 535 | const char **ep = png_get_error_ptr(png_ptr); |
| 536 | const char *name; |
| 537 | |
| 538 | if (ep != NULL && *ep != NULL) |
| 539 | name = *ep; |
| 540 | |
| 541 | else |
| 542 | name = "makepng"; |
| 543 | |
| 544 | fprintf(stderr, "%s: warning: %s\n", name, message); |
| 545 | } |
| 546 | |
| 547 | static void PNGCBAPI |
| 548 | makepng_error(png_structp png_ptr, png_const_charp message) |
| 549 | { |
| 550 | makepng_warning(png_ptr, message); |
| 551 | png_longjmp(png_ptr, 1); |
| 552 | } |
| 553 | |
| 554 | static int /* 0 on success, else an error code */ |
| 555 | write_png(const char **name, FILE *fp, int color_type, int bit_depth, |
| 556 | volatile png_fixed_point gamma, chunk_insert * volatile insert, |
| 557 | unsigned int filters, unsigned int *colors) |
| 558 | { |
| 559 | png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, |
| 560 | name, makepng_error, makepng_warning); |
| 561 | volatile png_infop info_ptr = NULL; |
| 562 | volatile png_bytep row = NULL; |
| 563 | |
| 564 | if (png_ptr == NULL) |
| 565 | { |
| 566 | fprintf(stderr, "makepng: OOM allocating write structure\n"); |
| 567 | return 1; |
| 568 | } |
| 569 | |
| 570 | if (setjmp(png_jmpbuf(png_ptr))) |
| 571 | { |
| 572 | png_structp nv_ptr = png_ptr; |
| 573 | png_infop nv_info = info_ptr; |
| 574 | |
| 575 | png_ptr = NULL; |
| 576 | info_ptr = NULL; |
| 577 | png_destroy_write_struct(&nv_ptr, &nv_info); |
| 578 | if (row != NULL) free(row); |
| 579 | return 1; |
| 580 | } |
| 581 | |
| 582 | /* Allow benign errors so that we can write PNGs with errors */ |
| 583 | png_set_benign_errors(png_ptr, 1/*allowed*/); |
| 584 | png_init_io(png_ptr, fp); |
| 585 | |
| 586 | info_ptr = png_create_info_struct(png_ptr); |
| 587 | if (info_ptr == NULL) |
| 588 | png_error(png_ptr, "OOM allocating info structure"); |
| 589 | |
| 590 | { |
| 591 | unsigned int size = image_size_of_type(color_type, bit_depth, colors); |
| 592 | png_fixed_point real_gamma = 45455; /* For sRGB */ |
| 593 | png_byte gamma_table[256]; |
| 594 | double conv; |
| 595 | |
| 596 | /* This function uses the libpng values used on read to carry extra |
| 597 | * information about the gamma: |
| 598 | */ |
| 599 | if (gamma == PNG_GAMMA_MAC_18) |
| 600 | gamma = 65909; |
| 601 | |
| 602 | else if (gamma > 0 && gamma < 1000) |
| 603 | gamma = PNG_FP_1; |
| 604 | |
| 605 | if (gamma > 0) |
| 606 | real_gamma = gamma; |
| 607 | |
| 608 | { |
| 609 | unsigned int i; |
| 610 | |
| 611 | if (real_gamma == 45455) for (i=0; i<256; ++i) |
| 612 | { |
| 613 | gamma_table[i] = (png_byte)i; |
| 614 | conv = 1.; |
| 615 | } |
| 616 | |
| 617 | else |
| 618 | { |
| 619 | /* Convert 'i' from sRGB (45455) to real_gamma, this makes |
| 620 | * the images look the same regardless of the gAMA chunk. |
| 621 | */ |
| 622 | conv = real_gamma; |
| 623 | conv /= 45455; |
| 624 | |
| 625 | gamma_table[0] = 0; |
| 626 | |
| 627 | for (i=1; i<255; ++i) |
| 628 | gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + .5); |
| 629 | |
| 630 | gamma_table[255] = 255; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | png_set_IHDR(png_ptr, info_ptr, size, size, bit_depth, color_type, |
| 635 | PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); |
| 636 | |
| 637 | if (color_type & PNG_COLOR_MASK_PALETTE) |
| 638 | { |
| 639 | int npalette; |
| 640 | png_color palette[256]; |
| 641 | png_byte trans[256]; |
| 642 | |
| 643 | npalette = generate_palette(palette, trans, bit_depth, gamma_table, |
| 644 | colors); |
| 645 | png_set_PLTE(png_ptr, info_ptr, palette, npalette); |
| 646 | png_set_tRNS(png_ptr, info_ptr, trans, npalette-1, |
| 647 | NULL/*transparent color*/); |
| 648 | |
| 649 | /* Reset gamma_table to prevent the image rows being changed */ |
| 650 | for (npalette=0; npalette<256; ++npalette) |
| 651 | gamma_table[npalette] = (png_byte)npalette; |
| 652 | } |
| 653 | |
| 654 | if (gamma == PNG_DEFAULT_sRGB) |
| 655 | png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE); |
| 656 | |
| 657 | else if (gamma > 0) /* Else don't set color space information */ |
| 658 | { |
| 659 | png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma); |
| 660 | |
| 661 | /* Just use the sRGB values here. */ |
| 662 | png_set_cHRM_fixed(png_ptr, info_ptr, |
| 663 | /* color x y */ |
| 664 | /* white */ 31270, 32900, |
| 665 | /* red */ 64000, 33000, |
| 666 | /* green */ 30000, 60000, |
| 667 | /* blue */ 15000, 6000 |
| 668 | ); |
| 669 | } |
| 670 | |
| 671 | /* Insert extra information. */ |
| 672 | while (insert != NULL) |
| 673 | { |
| 674 | insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters); |
| 675 | insert = insert->next; |
| 676 | } |
| 677 | |
| 678 | /* Write the file header. */ |
| 679 | png_write_info(png_ptr, info_ptr); |
| 680 | |
| 681 | /* Restrict the filters */ |
| 682 | png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters); |
| 683 | |
| 684 | { |
| 685 | int passes = png_set_interlace_handling(png_ptr); |
| 686 | int pass; |
| 687 | png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); |
| 688 | |
| 689 | row = malloc(rowbytes); |
| 690 | |
| 691 | if (row == NULL) |
| 692 | png_error(png_ptr, "OOM allocating row buffer"); |
| 693 | |
| 694 | for (pass = 0; pass < passes; ++pass) |
| 695 | { |
| 696 | unsigned int y; |
| 697 | |
| 698 | for (y=0; y<size; ++y) |
| 699 | { |
| 700 | generate_row(row, rowbytes, y, color_type, bit_depth, |
| 701 | gamma_table, conv, colors); |
| 702 | png_write_row(png_ptr, row); |
| 703 | } |
| 704 | } |
| 705 | } |
| 706 | } |
| 707 | |
| 708 | /* Finish writing the file. */ |
| 709 | png_write_end(png_ptr, info_ptr); |
| 710 | |
| 711 | { |
| 712 | png_structp nv_ptr = png_ptr; |
| 713 | png_infop nv_info = info_ptr; |
| 714 | |
| 715 | png_ptr = NULL; |
| 716 | info_ptr = NULL; |
| 717 | png_destroy_write_struct(&nv_ptr, &nv_info); |
| 718 | } |
| 719 | free(row); |
| 720 | return 0; |
| 721 | } |
| 722 | |
| 723 | |
| 724 | static size_t |
| 725 | load_file(png_const_charp name, png_bytepp result) |
| 726 | { |
| 727 | FILE *fp = tmpfile(); |
| 728 | |
| 729 | if (fp != NULL) |
| 730 | { |
| 731 | FILE *ip = fopen(name, "rb"); |
| 732 | |
| 733 | if (ip != NULL) |
| 734 | { |
| 735 | size_t total = 0; |
| 736 | int ch; |
| 737 | |
| 738 | for (;;) |
| 739 | { |
| 740 | ch = getc(ip); |
| 741 | if (ch == EOF) break; |
| 742 | putc(ch, fp); |
| 743 | ++total; |
| 744 | } |
| 745 | |
| 746 | if (ferror(ip)) |
| 747 | { |
| 748 | perror(name); |
| 749 | fprintf(stderr, "%s: read error\n", name); |
| 750 | (void)fclose(ip); |
| 751 | } |
| 752 | |
| 753 | else |
| 754 | { |
| 755 | (void)fclose(ip); |
| 756 | |
| 757 | if (ferror(fp)) |
| 758 | { |
| 759 | perror("temporary file"); |
| 760 | fprintf(stderr, "temporary file write error\n"); |
| 761 | } |
| 762 | |
| 763 | else |
| 764 | { |
| 765 | rewind(fp); |
| 766 | |
| 767 | if (total > 0) |
| 768 | { |
| 769 | /* Round up to a multiple of 4 here to allow an iCCP profile |
| 770 | * to be padded to a 4x boundary. |
| 771 | */ |
| 772 | png_bytep data = malloc((total+3)&~3); |
| 773 | |
| 774 | if (data != NULL) |
| 775 | { |
| 776 | size_t new_size = 0; |
| 777 | |
| 778 | for (;;) |
| 779 | { |
| 780 | ch = getc(fp); |
| 781 | if (ch == EOF) break; |
| 782 | data[new_size++] = (png_byte)ch; |
| 783 | } |
| 784 | |
| 785 | if (ferror(fp) || new_size != total) |
| 786 | { |
| 787 | perror("temporary file"); |
| 788 | fprintf(stderr, "temporary file read error\n"); |
| 789 | free(data); |
| 790 | } |
| 791 | |
| 792 | else |
| 793 | { |
| 794 | (void)fclose(fp); |
| 795 | *result = data; |
| 796 | return total; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | else |
| 801 | fprintf(stderr, "%s: out of memory loading file\n", name); |
| 802 | } |
| 803 | |
| 804 | else |
| 805 | fprintf(stderr, "%s: empty file\n", name); |
| 806 | } |
| 807 | } |
| 808 | } |
| 809 | |
| 810 | else |
| 811 | { |
| 812 | perror(name); |
| 813 | fprintf(stderr, "%s: open failed\n", name); |
| 814 | } |
| 815 | |
| 816 | fclose(fp); |
| 817 | } |
| 818 | |
| 819 | else |
| 820 | fprintf(stderr, "makepng: %s: could not open temporary file\n", name); |
| 821 | |
| 822 | exit(1); |
| 823 | return 0; |
| 824 | } |
| 825 | |
| 826 | static png_size_t |
| 827 | load_fake(png_charp param, png_bytepp profile) |
| 828 | { |
| 829 | char *endptr = NULL; |
| 830 | unsigned long long int size = strtoull(param, &endptr, 0/*base*/); |
| 831 | |
| 832 | /* The 'fake' format is <number>*[string] */ |
| 833 | if (endptr != NULL && *endptr == '*') |
| 834 | { |
| 835 | size_t len = strlen(++endptr); |
| 836 | size_t result = (size_t)size; |
| 837 | |
| 838 | if (len == 0) len = 1; /* capture the terminating '\0' */ |
| 839 | |
| 840 | /* Now repeat that string to fill 'size' bytes. */ |
| 841 | if (result == size && (*profile = malloc(result)) != NULL) |
| 842 | { |
| 843 | png_bytep out = *profile; |
| 844 | |
| 845 | if (len == 1) |
| 846 | memset(out, *endptr, result); |
| 847 | |
| 848 | else |
| 849 | { |
| 850 | while (size >= len) |
| 851 | { |
| 852 | memcpy(out, endptr, len); |
| 853 | out += len; |
| 854 | size -= len; |
| 855 | } |
| 856 | memcpy(out, endptr, size); |
| 857 | } |
| 858 | |
| 859 | return result; |
| 860 | } |
| 861 | |
| 862 | else |
| 863 | { |
| 864 | fprintf(stderr, "%s: size exceeds system limits\n", param); |
| 865 | exit(1); |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | return 0; |
| 870 | } |
| 871 | |
| 872 | static void |
| 873 | check_param_count(int nparams, int expect) |
| 874 | { |
| 875 | if (nparams != expect) |
| 876 | { |
| 877 | fprintf(stderr, "bad parameter count (internal error)\n"); |
| 878 | exit(1); |
| 879 | } |
| 880 | } |
| 881 | |
| 882 | static void |
| 883 | insert_iCCP(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 884 | png_charpp params) |
| 885 | { |
| 886 | png_bytep profile = NULL; |
| 887 | png_uint_32 proflen = 0; |
| 888 | int result; |
| 889 | |
| 890 | check_param_count(nparams, 2); |
| 891 | |
| 892 | switch (params[1][0]) |
| 893 | { |
| 894 | case '<': |
| 895 | { |
| 896 | png_size_t filelen = load_file(params[1]+1, &profile); |
| 897 | if (filelen > 0xfffffffc) /* Maximum profile length */ |
| 898 | { |
| 899 | fprintf(stderr, "%s: file too long (%lu) for an ICC profile\n", |
| 900 | params[1]+1, (unsigned long)filelen); |
| 901 | exit(1); |
| 902 | } |
| 903 | |
| 904 | proflen = (png_uint_32)filelen; |
| 905 | } |
| 906 | break; |
| 907 | |
| 908 | case '0': case '1': case '2': case '3': case '4': |
| 909 | case '5': case '6': case '7': case '8': case '9': |
| 910 | { |
| 911 | png_size_t fake_len = load_fake(params[1], &profile); |
| 912 | |
| 913 | if (fake_len > 0) /* else a simple parameter */ |
| 914 | { |
| 915 | if (fake_len > 0xffffffff) /* Maximum profile length */ |
| 916 | { |
| 917 | fprintf(stderr, |
| 918 | "%s: fake data too long (%lu) for an ICC profile\n", |
| 919 | params[1], (unsigned long)fake_len); |
| 920 | exit(1); |
| 921 | } |
| 922 | proflen = (png_uint_32)(fake_len & ~3U); |
| 923 | /* Always fix up the profile length. */ |
| 924 | png_save_uint_32(profile, proflen); |
| 925 | break; |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | default: |
| 930 | fprintf(stderr, "--insert iCCP \"%s\": unrecognized\n", params[1]); |
| 931 | fprintf(stderr, " use '<' to read a file: \"<filename\"\n"); |
| 932 | exit(1); |
| 933 | } |
| 934 | |
| 935 | result = 1; |
| 936 | |
| 937 | if (proflen & 3) |
| 938 | { |
| 939 | fprintf(stderr, |
| 940 | "makepng: --insert iCCP %s: profile length made a multiple of 4\n", |
| 941 | params[1]); |
| 942 | |
| 943 | /* load_file allocates extra space for this padding, the ICC spec requires |
| 944 | * padding with zero bytes. |
| 945 | */ |
| 946 | while (proflen & 3) |
| 947 | profile[proflen++] = 0; |
| 948 | } |
| 949 | |
| 950 | if (profile != NULL && proflen > 3) |
| 951 | { |
| 952 | png_uint_32 prof_header = png_get_uint_32(profile); |
| 953 | |
| 954 | if (prof_header != proflen) |
| 955 | { |
| 956 | fprintf(stderr, "--insert iCCP %s: profile length field wrong:\n", |
| 957 | params[1]); |
| 958 | fprintf(stderr, " actual %lu, recorded value %lu (corrected)\n", |
| 959 | (unsigned long)proflen, (unsigned long)prof_header); |
| 960 | png_save_uint_32(profile, proflen); |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | if (result && profile != NULL && proflen >=4) |
| 965 | png_set_iCCP(png_ptr, info_ptr, params[0], PNG_COMPRESSION_TYPE_BASE, |
| 966 | profile, proflen); |
| 967 | |
| 968 | if (profile) |
| 969 | free(profile); |
| 970 | |
| 971 | if (!result) |
| 972 | exit(1); |
| 973 | } |
| 974 | |
| 975 | static void |
| 976 | clear_text(png_text *text, png_charp keyword) |
| 977 | { |
| 978 | text->compression = -1; /* none */ |
| 979 | text->key = keyword; |
| 980 | text->text = NULL; |
| 981 | text->text_length = 0; /* libpng calculates this */ |
| 982 | text->itxt_length = 0; /* libpng calculates this */ |
| 983 | text->lang = NULL; |
| 984 | text->lang_key = NULL; |
| 985 | } |
| 986 | |
| 987 | static void |
| 988 | set_text(png_structp png_ptr, png_infop info_ptr, png_textp text, |
| 989 | png_charp param) |
| 990 | { |
| 991 | switch (param[0]) |
| 992 | { |
| 993 | case '<': |
| 994 | { |
| 995 | png_bytep file = NULL; |
| 996 | |
| 997 | text->text_length = load_file(param+1, &file); |
| 998 | text->text = (png_charp)file; |
| 999 | } |
| 1000 | break; |
| 1001 | |
| 1002 | case '0': case '1': case '2': case '3': case '4': |
| 1003 | case '5': case '6': case '7': case '8': case '9': |
| 1004 | { |
| 1005 | png_bytep data = NULL; |
| 1006 | png_size_t fake_len = load_fake(param, &data); |
| 1007 | |
| 1008 | if (fake_len > 0) /* else a simple parameter */ |
| 1009 | { |
| 1010 | text->text_length = fake_len; |
| 1011 | text->text = (png_charp)data; |
| 1012 | break; |
| 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | default: |
| 1017 | text->text = param; |
| 1018 | break; |
| 1019 | } |
| 1020 | |
| 1021 | png_set_text(png_ptr, info_ptr, text, 1); |
| 1022 | |
| 1023 | if (text->text != param) |
| 1024 | free(text->text); |
| 1025 | } |
| 1026 | |
| 1027 | static void |
| 1028 | insert_tEXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1029 | png_charpp params) |
| 1030 | { |
| 1031 | png_text text; |
| 1032 | |
| 1033 | check_param_count(nparams, 2); |
| 1034 | clear_text(&text, params[0]); |
| 1035 | set_text(png_ptr, info_ptr, &text, params[1]); |
| 1036 | } |
| 1037 | |
| 1038 | static void |
| 1039 | insert_zTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1040 | png_charpp params) |
| 1041 | { |
| 1042 | png_text text; |
| 1043 | |
| 1044 | check_param_count(nparams, 2); |
| 1045 | clear_text(&text, params[0]); |
| 1046 | text.compression = 0; /* deflate */ |
| 1047 | set_text(png_ptr, info_ptr, &text, params[1]); |
| 1048 | } |
| 1049 | |
| 1050 | static void |
| 1051 | insert_iTXt(png_structp png_ptr, png_infop info_ptr, int nparams, |
| 1052 | png_charpp params) |
| 1053 | { |
| 1054 | png_text text; |
| 1055 | |
| 1056 | check_param_count(nparams, 4); |
| 1057 | clear_text(&text, params[0]); |
| 1058 | text.compression = 2; /* iTXt + deflate */ |
| 1059 | text.lang = params[1];/* language tag */ |
| 1060 | text.lang_key = params[2]; /* translated keyword */ |
| 1061 | set_text(png_ptr, info_ptr, &text, params[3]); |
| 1062 | } |
| 1063 | |
| 1064 | static void |
| 1065 | insert_hIST(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) |
| 1066 | { |
| 1067 | int i; |
| 1068 | png_uint_16 freq[256]; |
| 1069 | |
| 1070 | /* libpng takes the count from the PLTE count; we don't check it here but we |
| 1071 | * do set the array to 0 for unspecified entries. |
| 1072 | */ |
| 1073 | memset(freq, 0, sizeof freq); |
| 1074 | for (i=0; i<nparams; ++i) |
| 1075 | { |
| 1076 | char *endptr = NULL; |
| 1077 | unsigned long int l = strtoul(params[i], &endptr, 0/*base*/); |
| 1078 | |
| 1079 | if (params[i][0] && *endptr == 0 && l <= 65535) |
| 1080 | freq[i] = (png_uint_16)l; |
| 1081 | |
| 1082 | else |
| 1083 | { |
| 1084 | fprintf(stderr, "hIST[%d]: %s: invalid frequency\n", i, params[i]); |
| 1085 | exit(1); |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | png_set_hIST(png_ptr, info_ptr, freq); |
| 1090 | } |
| 1091 | |
| 1092 | #if 0 |
| 1093 | static void |
| 1094 | insert_sPLT(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) |
| 1095 | { |
| 1096 | fprintf(stderr, "insert sPLT: NYI\n"); |
| 1097 | } |
| 1098 | #endif |
| 1099 | |
| 1100 | static int |
| 1101 | find_parameters(png_const_charp what, png_charp param, png_charp *list, |
| 1102 | int nparams) |
| 1103 | { |
| 1104 | /* Parameters are separated by '\n' or ':' characters, up to nparams are |
| 1105 | * accepted (more is an error) and the number found is returned. |
| 1106 | */ |
| 1107 | int i; |
| 1108 | for (i=0; *param && i<nparams; ++i) |
| 1109 | { |
| 1110 | list[i] = param; |
| 1111 | while (*++param) if (*param == '\n' || *param == ':') |
| 1112 | { |
| 1113 | *param++ = 0; /* Terminate last parameter */ |
| 1114 | break; /* And start a new one. */ |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | if (*param) |
| 1119 | { |
| 1120 | fprintf(stderr, "--insert %s: too many parameters (%s)\n", what, param); |
| 1121 | exit(1); |
| 1122 | } |
| 1123 | |
| 1124 | list[i] = NULL; /* terminates list */ |
| 1125 | return i; /* number of parameters filled in */ |
| 1126 | } |
| 1127 | |
| 1128 | static void |
| 1129 | bad_parameter_count(png_const_charp what, int nparams) |
| 1130 | { |
| 1131 | fprintf(stderr, "--insert %s: bad parameter count %d\n", what, nparams); |
| 1132 | exit(1); |
| 1133 | } |
| 1134 | |
| 1135 | static chunk_insert * |
| 1136 | make_insert(png_const_charp what, |
| 1137 | void (*insert)(png_structp, png_infop, int, png_charpp), |
| 1138 | int nparams, png_charpp list) |
| 1139 | { |
| 1140 | int i; |
| 1141 | chunk_insert *cip; |
| 1142 | |
| 1143 | cip = malloc(offsetof(chunk_insert,parameters) + |
| 1144 | nparams * sizeof (png_charp)); |
| 1145 | |
| 1146 | if (cip == NULL) |
| 1147 | { |
| 1148 | fprintf(stderr, "--insert %s: out of memory allocating %d parameters\n", |
| 1149 | what, nparams); |
| 1150 | exit(1); |
| 1151 | } |
| 1152 | |
| 1153 | cip->next = NULL; |
| 1154 | cip->insert = insert; |
| 1155 | cip->nparams = nparams; |
| 1156 | for (i=0; i<nparams; ++i) |
| 1157 | cip->parameters[i] = list[i]; |
| 1158 | |
| 1159 | return cip; |
| 1160 | } |
| 1161 | |
| 1162 | static chunk_insert * |
| 1163 | find_insert(png_const_charp what, png_charp param) |
| 1164 | { |
| 1165 | png_uint_32 chunk = 0; |
| 1166 | png_charp parameter_list[1024]; |
| 1167 | int i, nparams; |
| 1168 | |
| 1169 | /* Assemble the chunk name */ |
| 1170 | for (i=0; i<4; ++i) |
| 1171 | { |
| 1172 | char ch = what[i]; |
| 1173 | |
| 1174 | if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)) |
| 1175 | chunk = (chunk << 8) + what[i]; |
| 1176 | |
| 1177 | else |
| 1178 | break; |
| 1179 | } |
| 1180 | |
| 1181 | if (i < 4 || what[4] != 0) |
| 1182 | { |
| 1183 | fprintf(stderr, "makepng --insert \"%s\": invalid chunk name\n", what); |
| 1184 | exit(1); |
| 1185 | } |
| 1186 | |
| 1187 | /* Assemble the parameter list. */ |
| 1188 | nparams = find_parameters(what, param, parameter_list, 1024); |
| 1189 | |
| 1190 | # define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d)) |
| 1191 | |
| 1192 | switch (chunk) |
| 1193 | { |
| 1194 | case CHUNK(105,67,67,80): /* iCCP */ |
| 1195 | if (nparams == 2) |
| 1196 | return make_insert(what, insert_iCCP, nparams, parameter_list); |
| 1197 | break; |
| 1198 | |
| 1199 | case CHUNK(116,69,88,116): /* tEXt */ |
| 1200 | if (nparams == 2) |
| 1201 | return make_insert(what, insert_tEXt, nparams, parameter_list); |
| 1202 | break; |
| 1203 | |
| 1204 | case CHUNK(122,84,88,116): /* zTXt */ |
| 1205 | if (nparams == 2) |
| 1206 | return make_insert(what, insert_zTXt, nparams, parameter_list); |
| 1207 | break; |
| 1208 | |
| 1209 | case CHUNK(105,84,88,116): /* iTXt */ |
| 1210 | if (nparams == 4) |
| 1211 | return make_insert(what, insert_iTXt, nparams, parameter_list); |
| 1212 | break; |
| 1213 | |
| 1214 | case CHUNK(104,73,83,84): /* hIST */ |
| 1215 | if (nparams <= 256) |
| 1216 | return make_insert(what, insert_hIST, nparams, parameter_list); |
| 1217 | break; |
| 1218 | |
| 1219 | #if 0 |
| 1220 | case CHUNK(115,80,76,84): /* sPLT */ |
| 1221 | return make_insert(what, insert_sPLT, nparams, parameter_list); |
| 1222 | #endif |
| 1223 | |
| 1224 | default: |
| 1225 | fprintf(stderr, "makepng --insert \"%s\": unrecognized chunk name\n", |
| 1226 | what); |
| 1227 | exit(1); |
| 1228 | } |
| 1229 | |
| 1230 | bad_parameter_count(what, nparams); |
| 1231 | return NULL; |
| 1232 | } |
| 1233 | |
| 1234 | /* This is a not-very-good parser for a sequence of numbers (including 0). It |
| 1235 | * doesn't accept some apparently valid things, but it accepts all the sensible |
| 1236 | * combinations. |
| 1237 | */ |
| 1238 | static void |
| 1239 | parse_color(char *arg, unsigned int *colors) |
| 1240 | { |
| 1241 | unsigned int ncolors = 0; |
| 1242 | |
| 1243 | while (*arg && ncolors < 4) |
| 1244 | { |
| 1245 | char *ep = arg; |
| 1246 | |
| 1247 | unsigned long ul = strtoul(arg, &ep, 0); |
| 1248 | |
| 1249 | if (ul > 65535) |
| 1250 | { |
| 1251 | fprintf(stderr, "makepng --color=...'%s': too big\n", arg); |
| 1252 | exit(1); |
| 1253 | } |
| 1254 | |
| 1255 | if (ep == arg) |
| 1256 | { |
| 1257 | fprintf(stderr, "makepng --color=...'%s': not a valid color\n", arg); |
| 1258 | exit(1); |
| 1259 | } |
| 1260 | |
| 1261 | if (*ep) ++ep; /* skip a separator */ |
| 1262 | arg = ep; |
| 1263 | |
| 1264 | colors[++ncolors] = (unsigned int)ul; /* checked above */ |
| 1265 | } |
| 1266 | |
| 1267 | if (*arg) |
| 1268 | { |
| 1269 | fprintf(stderr, "makepng --color=...'%s': too many values\n", arg); |
| 1270 | exit(1); |
| 1271 | } |
| 1272 | |
| 1273 | *colors = ncolors; |
| 1274 | } |
| 1275 | |
| 1276 | int |
| 1277 | main(int argc, char **argv) |
| 1278 | { |
| 1279 | FILE *fp = stdout; |
| 1280 | const char *file_name = NULL; |
| 1281 | int color_type = 8; /* invalid */ |
| 1282 | int bit_depth = 32; /* invalid */ |
| 1283 | unsigned int colors[5]; |
| 1284 | unsigned int filters = PNG_ALL_FILTERS; |
| 1285 | png_fixed_point gamma = 0; /* not set */ |
| 1286 | chunk_insert *head_insert = NULL; |
| 1287 | chunk_insert **insert_ptr = &head_insert; |
| 1288 | |
| 1289 | memset(colors, 0, sizeof colors); |
| 1290 | |
| 1291 | while (--argc > 0) |
| 1292 | { |
| 1293 | char *arg = *++argv; |
| 1294 | |
| 1295 | if (strcmp(arg, "--sRGB") == 0) |
| 1296 | { |
| 1297 | gamma = PNG_DEFAULT_sRGB; |
| 1298 | continue; |
| 1299 | } |
| 1300 | |
| 1301 | if (strcmp(arg, "--linear") == 0) |
| 1302 | { |
| 1303 | gamma = PNG_FP_1; |
| 1304 | continue; |
| 1305 | } |
| 1306 | |
| 1307 | if (strcmp(arg, "--1.8") == 0) |
| 1308 | { |
| 1309 | gamma = PNG_GAMMA_MAC_18; |
| 1310 | continue; |
| 1311 | } |
| 1312 | |
| 1313 | if (strcmp(arg, "--nofilters") == 0) |
| 1314 | { |
| 1315 | filters = PNG_FILTER_NONE; |
| 1316 | continue; |
| 1317 | } |
| 1318 | |
| 1319 | if (strncmp(arg, "--color=", 8) == 0) |
| 1320 | { |
| 1321 | parse_color(arg+8, colors); |
| 1322 | continue; |
| 1323 | } |
| 1324 | |
| 1325 | if (argc >= 3 && strcmp(arg, "--insert") == 0) |
| 1326 | { |
| 1327 | png_const_charp what = *++argv; |
| 1328 | png_charp param = *++argv; |
| 1329 | chunk_insert *new_insert; |
| 1330 | |
| 1331 | argc -= 2; |
| 1332 | |
| 1333 | new_insert = find_insert(what, param); |
| 1334 | |
| 1335 | if (new_insert != NULL) |
| 1336 | { |
| 1337 | *insert_ptr = new_insert; |
| 1338 | insert_ptr = &new_insert->next; |
| 1339 | } |
| 1340 | |
| 1341 | continue; |
| 1342 | } |
| 1343 | |
| 1344 | if (arg[0] == '-') |
| 1345 | { |
| 1346 | fprintf(stderr, "makepng: %s: invalid option\n", arg); |
| 1347 | exit(1); |
| 1348 | } |
| 1349 | |
| 1350 | if (strcmp(arg, "palette") == 0) |
| 1351 | { |
| 1352 | color_type = PNG_COLOR_TYPE_PALETTE; |
| 1353 | continue; |
| 1354 | } |
| 1355 | |
| 1356 | if (strncmp(arg, "gray", 4) == 0) |
| 1357 | { |
| 1358 | if (arg[4] == 0) |
| 1359 | { |
| 1360 | color_type = PNG_COLOR_TYPE_GRAY; |
| 1361 | continue; |
| 1362 | } |
| 1363 | |
| 1364 | else if (strcmp(arg+4, "a") == 0 || |
| 1365 | strcmp(arg+4, "alpha") == 0 || |
| 1366 | strcmp(arg+4, "-alpha") == 0) |
| 1367 | { |
| 1368 | color_type = PNG_COLOR_TYPE_GRAY_ALPHA; |
| 1369 | continue; |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | if (strncmp(arg, "rgb", 3) == 0) |
| 1374 | { |
| 1375 | if (arg[3] == 0) |
| 1376 | { |
| 1377 | color_type = PNG_COLOR_TYPE_RGB; |
| 1378 | continue; |
| 1379 | } |
| 1380 | |
| 1381 | else if (strcmp(arg+3, "a") == 0 || |
| 1382 | strcmp(arg+3, "alpha") == 0 || |
| 1383 | strcmp(arg+3, "-alpha") == 0) |
| 1384 | { |
| 1385 | color_type = PNG_COLOR_TYPE_RGB_ALPHA; |
| 1386 | continue; |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | if (color_type == 8 && isdigit(arg[0])) |
| 1391 | { |
| 1392 | color_type = atoi(arg); |
| 1393 | if (color_type < 0 || color_type > 6 || color_type == 1 || |
| 1394 | color_type == 5) |
| 1395 | { |
| 1396 | fprintf(stderr, "makepng: %s: not a valid color type\n", arg); |
| 1397 | exit(1); |
| 1398 | } |
| 1399 | |
| 1400 | continue; |
| 1401 | } |
| 1402 | |
| 1403 | if (bit_depth == 32 && isdigit(arg[0])) |
| 1404 | { |
| 1405 | bit_depth = atoi(arg); |
| 1406 | if (bit_depth <= 0 || bit_depth > 16 || |
| 1407 | (bit_depth & -bit_depth) != bit_depth) |
| 1408 | { |
| 1409 | fprintf(stderr, "makepng: %s: not a valid bit depth\n", arg); |
| 1410 | exit(1); |
| 1411 | } |
| 1412 | |
| 1413 | continue; |
| 1414 | } |
| 1415 | |
| 1416 | if (argc == 1) /* It's the file name */ |
| 1417 | { |
| 1418 | fp = fopen(arg, "wb"); |
| 1419 | if (fp == NULL) |
| 1420 | { |
| 1421 | fprintf(stderr, "%s: %s: could not open\n", arg, strerror(errno)); |
| 1422 | exit(1); |
| 1423 | } |
| 1424 | |
| 1425 | file_name = arg; |
| 1426 | continue; |
| 1427 | } |
| 1428 | |
| 1429 | fprintf(stderr, "makepng: %s: unknown argument\n", arg); |
| 1430 | exit(1); |
| 1431 | } /* argument while loop */ |
| 1432 | |
| 1433 | if (color_type == 8 || bit_depth == 32) |
| 1434 | { |
| 1435 | fprintf(stderr, "usage: makepng [--sRGB|--linear|--1.8] " |
| 1436 | "[--color=...] color-type bit-depth [file-name]\n" |
| 1437 | " Make a test PNG file, by default writes to stdout.\n"); |
| 1438 | exit(1); |
| 1439 | } |
| 1440 | |
| 1441 | /* Check the colors */ |
| 1442 | { |
| 1443 | const unsigned int lim = (color_type == PNG_COLOR_TYPE_PALETTE ? 255U : |
| 1444 | (1U<<bit_depth)-1); |
| 1445 | unsigned int i; |
| 1446 | |
| 1447 | for (i=1; i<=colors[0]; ++i) |
| 1448 | if (colors[i] > lim) |
| 1449 | { |
| 1450 | fprintf(stderr, "makepng: --color=...: %u out of range [0..%u]\n", |
| 1451 | colors[i], lim); |
| 1452 | exit(1); |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | /* Restrict the filters for more speed to those we know are used for the |
| 1457 | * generated images. |
| 1458 | */ |
| 1459 | if (filters == PNG_ALL_FILTERS) |
| 1460 | { |
| 1461 | if ((color_type & PNG_COLOR_MASK_PALETTE) != 0 || bit_depth < 8) |
| 1462 | filters = PNG_FILTER_NONE; |
| 1463 | |
| 1464 | else if (color_type & PNG_COLOR_MASK_COLOR) /* rgb */ |
| 1465 | { |
| 1466 | if (bit_depth == 8) |
| 1467 | filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG); |
| 1468 | |
| 1469 | else |
| 1470 | filters = PNG_FILTER_SUB | PNG_FILTER_PAETH; |
| 1471 | } |
| 1472 | |
| 1473 | else /* gray 8 or 16-bit */ |
| 1474 | filters &= ~PNG_FILTER_NONE; |
| 1475 | } |
| 1476 | |
| 1477 | { |
| 1478 | int ret = write_png(&file_name, fp, color_type, bit_depth, gamma, |
| 1479 | head_insert, filters, colors); |
| 1480 | |
| 1481 | if (ret != 0 && file_name != NULL) |
| 1482 | remove(file_name); |
| 1483 | |
| 1484 | return ret; |
| 1485 | } |
| 1486 | } |