| 1 | |
| 2 | /* pngwrite.c - general routines to write a PNG file |
| 3 | * |
| 4 | * libpng 1.0.3 - January 14, 1999 |
| 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 7 | * Copyright (c) 1996, 1997 Andreas Dilger |
| 8 | * Copyright (c) 1998, 1999 Glenn Randers-Pehrson |
| 9 | */ |
| 10 | |
| 11 | /* get internal access to png.h */ |
| 12 | #define PNG_INTERNAL |
| 13 | #include "png.h" |
| 14 | |
| 15 | /* Writes all the PNG information. This is the suggested way to use the |
| 16 | * library. If you have a new chunk to add, make a function to write it, |
| 17 | * and put it in the correct location here. If you want the chunk written |
| 18 | * after the image data, put it in png_write_end(). I strongly encourage |
| 19 | * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing |
| 20 | * the chunk, as that will keep the code from breaking if you want to just |
| 21 | * write a plain PNG file. If you have long comments, I suggest writing |
| 22 | * them in png_write_end(), and compressing them. |
| 23 | */ |
| 24 | void |
| 25 | png_write_info(png_structp png_ptr, png_infop info_ptr) |
| 26 | { |
| 27 | #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 28 | int i; |
| 29 | #endif |
| 30 | |
| 31 | png_debug(1, "in png_write_info\n"); |
| 32 | png_write_sig(png_ptr); /* write PNG signature */ |
| 33 | /* write IHDR information. */ |
| 34 | png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, |
| 35 | info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, |
| 36 | info_ptr->filter_type, |
| 37 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 38 | info_ptr->interlace_type); |
| 39 | #else |
| 40 | 0); |
| 41 | #endif |
| 42 | /* the rest of these check to see if the valid field has the appropriate |
| 43 | flag set, and if it does, writes the chunk. */ |
| 44 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
| 45 | if (info_ptr->valid & PNG_INFO_gAMA) |
| 46 | png_write_gAMA(png_ptr, info_ptr->gamma); |
| 47 | #endif |
| 48 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 49 | if (info_ptr->valid & PNG_INFO_sRGB) |
| 50 | png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); |
| 51 | #endif |
| 52 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
| 53 | if (info_ptr->valid & PNG_INFO_sBIT) |
| 54 | png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); |
| 55 | #endif |
| 56 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
| 57 | if (info_ptr->valid & PNG_INFO_cHRM) |
| 58 | png_write_cHRM(png_ptr, |
| 59 | info_ptr->x_white, info_ptr->y_white, |
| 60 | info_ptr->x_red, info_ptr->y_red, |
| 61 | info_ptr->x_green, info_ptr->y_green, |
| 62 | info_ptr->x_blue, info_ptr->y_blue); |
| 63 | #endif |
| 64 | if (info_ptr->valid & PNG_INFO_PLTE) |
| 65 | png_write_PLTE(png_ptr, info_ptr->palette, |
| 66 | (png_uint_32)info_ptr->num_palette); |
| 67 | else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 68 | png_error(png_ptr, "Valid palette required for paletted images\n"); |
| 69 | |
| 70 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
| 71 | if (info_ptr->valid & PNG_INFO_tRNS) |
| 72 | { |
| 73 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 74 | /* invert the alpha channel (in tRNS) */ |
| 75 | if (png_ptr->transformations & PNG_INVERT_ALPHA && |
| 76 | info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 77 | { |
| 78 | int j; |
| 79 | for (j=0; j<(int)info_ptr->num_trans; j++) |
| 80 | info_ptr->trans[j] = 255 - info_ptr->trans[j]; |
| 81 | } |
| 82 | #endif |
| 83 | png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values), |
| 84 | info_ptr->num_trans, info_ptr->color_type); |
| 85 | } |
| 86 | #endif |
| 87 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
| 88 | if (info_ptr->valid & PNG_INFO_bKGD) |
| 89 | png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type); |
| 90 | #endif |
| 91 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
| 92 | if (info_ptr->valid & PNG_INFO_hIST) |
| 93 | png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette); |
| 94 | #endif |
| 95 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| 96 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 97 | png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset, |
| 98 | info_ptr->offset_unit_type); |
| 99 | #endif |
| 100 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 101 | if (info_ptr->valid & PNG_INFO_pCAL) |
| 102 | png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0, |
| 103 | info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams, |
| 104 | info_ptr->pcal_units, info_ptr->pcal_params); |
| 105 | #endif |
| 106 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
| 107 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 108 | png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit, |
| 109 | info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type); |
| 110 | #endif |
| 111 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 112 | if (info_ptr->valid & PNG_INFO_tIME) |
| 113 | { |
| 114 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
| 115 | png_ptr->flags |= PNG_FLAG_WROTE_tIME; |
| 116 | } |
| 117 | #endif |
| 118 | #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 119 | /* Check to see if we need to write text chunks */ |
| 120 | for (i = 0; i < info_ptr->num_text; i++) |
| 121 | { |
| 122 | png_debug2(2, "Writing header text chunk %d, type %d\n", i, |
| 123 | info_ptr->text[i].compression); |
| 124 | /* If we want a compressed text chunk */ |
| 125 | if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) |
| 126 | { |
| 127 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
| 128 | /* write compressed chunk */ |
| 129 | png_write_zTXt(png_ptr, info_ptr->text[i].key, |
| 130 | info_ptr->text[i].text, info_ptr->text[i].text_length, |
| 131 | info_ptr->text[i].compression); |
| 132 | #else |
| 133 | png_warning(png_ptr, "Unable to write compressed text\n"); |
| 134 | #endif |
| 135 | /* Mark this chunk as written */ |
| 136 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| 137 | } |
| 138 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| 139 | { |
| 140 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
| 141 | /* write uncompressed chunk */ |
| 142 | png_write_tEXt(png_ptr, info_ptr->text[i].key, |
| 143 | info_ptr->text[i].text, info_ptr->text[i].text_length); |
| 144 | #else |
| 145 | png_warning(png_ptr, "Unable to write uncompressed text\n"); |
| 146 | #endif |
| 147 | /* Mark this chunk as written */ |
| 148 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| 149 | } |
| 150 | } |
| 151 | #endif |
| 152 | } |
| 153 | |
| 154 | /* Writes the end of the PNG file. If you don't want to write comments or |
| 155 | * time information, you can pass NULL for info. If you already wrote these |
| 156 | * in png_write_info(), do not write them again here. If you have long |
| 157 | * comments, I suggest writing them here, and compressing them. |
| 158 | */ |
| 159 | void |
| 160 | png_write_end(png_structp png_ptr, png_infop info_ptr) |
| 161 | { |
| 162 | png_debug(1, "in png_write_end\n"); |
| 163 | if (!(png_ptr->mode & PNG_HAVE_IDAT)) |
| 164 | png_error(png_ptr, "No IDATs written into file"); |
| 165 | |
| 166 | /* see if user wants us to write information chunks */ |
| 167 | if (info_ptr != NULL) |
| 168 | { |
| 169 | #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 170 | int i; /* local index variable */ |
| 171 | #endif |
| 172 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 173 | /* check to see if user has supplied a time chunk */ |
| 174 | if (info_ptr->valid & PNG_INFO_tIME && |
| 175 | !(png_ptr->flags & PNG_FLAG_WROTE_tIME)) |
| 176 | png_write_tIME(png_ptr, &(info_ptr->mod_time)); |
| 177 | #endif |
| 178 | #if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) |
| 179 | /* loop through comment chunks */ |
| 180 | for (i = 0; i < info_ptr->num_text; i++) |
| 181 | { |
| 182 | png_debug2(2, "Writing trailer text chunk %d, type %d\n", i, |
| 183 | info_ptr->text[i].compression); |
| 184 | if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt) |
| 185 | { |
| 186 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
| 187 | /* write compressed chunk */ |
| 188 | png_write_zTXt(png_ptr, info_ptr->text[i].key, |
| 189 | info_ptr->text[i].text, info_ptr->text[i].text_length, |
| 190 | info_ptr->text[i].compression); |
| 191 | #else |
| 192 | png_warning(png_ptr, "Unable to write compressed text\n"); |
| 193 | #endif |
| 194 | /* Mark this chunk as written */ |
| 195 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR; |
| 196 | } |
| 197 | else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE) |
| 198 | { |
| 199 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
| 200 | /* write uncompressed chunk */ |
| 201 | png_write_tEXt(png_ptr, info_ptr->text[i].key, |
| 202 | info_ptr->text[i].text, info_ptr->text[i].text_length); |
| 203 | #else |
| 204 | png_warning(png_ptr, "Unable to write uncompressed text\n"); |
| 205 | #endif |
| 206 | |
| 207 | /* Mark this chunk as written */ |
| 208 | info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR; |
| 209 | } |
| 210 | } |
| 211 | #endif |
| 212 | } |
| 213 | |
| 214 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 215 | |
| 216 | /* write end of PNG file */ |
| 217 | png_write_IEND(png_ptr); |
| 218 | } |
| 219 | |
| 220 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 221 | void |
| 222 | png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime) |
| 223 | { |
| 224 | png_debug(1, "in png_convert_from_struct_tm\n"); |
| 225 | ptime->year = (png_uint_16)(1900 + ttime->tm_year); |
| 226 | ptime->month = (png_byte)(ttime->tm_mon + 1); |
| 227 | ptime->day = (png_byte)ttime->tm_mday; |
| 228 | ptime->hour = (png_byte)ttime->tm_hour; |
| 229 | ptime->minute = (png_byte)ttime->tm_min; |
| 230 | ptime->second = (png_byte)ttime->tm_sec; |
| 231 | } |
| 232 | |
| 233 | void |
| 234 | png_convert_from_time_t(png_timep ptime, time_t ttime) |
| 235 | { |
| 236 | struct tm *tbuf; |
| 237 | |
| 238 | png_debug(1, "in png_convert_from_time_t\n"); |
| 239 | tbuf = gmtime(&ttime); |
| 240 | png_convert_from_struct_tm(ptime, tbuf); |
| 241 | } |
| 242 | #endif |
| 243 | |
| 244 | /* Initialize png_ptr structure, and allocate any memory needed */ |
| 245 | png_structp |
| 246 | png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr, |
| 247 | png_error_ptr error_fn, png_error_ptr warn_fn) |
| 248 | { |
| 249 | #ifdef PNG_USER_MEM_SUPPORTED |
| 250 | return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, |
| 251 | warn_fn, NULL, NULL, NULL)); |
| 252 | } |
| 253 | |
| 254 | /* Alternate initialize png_ptr structure, and allocate any memory needed */ |
| 255 | png_structp |
| 256 | png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr, |
| 257 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 258 | png_malloc_ptr malloc_fn, png_free_ptr free_fn) |
| 259 | { |
| 260 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 261 | png_structp png_ptr; |
| 262 | #ifdef USE_FAR_KEYWORD |
| 263 | jmp_buf jmpbuf; |
| 264 | #endif |
| 265 | png_debug(1, "in png_create_write_struct\n"); |
| 266 | #ifdef PNG_USER_MEM_SUPPORTED |
| 267 | if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, |
| 268 | (png_malloc_ptr)malloc_fn)) == NULL) |
| 269 | #else |
| 270 | if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL) |
| 271 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 272 | { |
| 273 | return ((png_structp)NULL); |
| 274 | } |
| 275 | #ifdef USE_FAR_KEYWORD |
| 276 | if (setjmp(jmpbuf)) |
| 277 | #else |
| 278 | if (setjmp(png_ptr->jmpbuf)) |
| 279 | #endif |
| 280 | { |
| 281 | png_free(png_ptr, png_ptr->zbuf); |
| 282 | png_destroy_struct(png_ptr); |
| 283 | return ((png_structp)NULL); |
| 284 | } |
| 285 | #ifdef USE_FAR_KEYWORD |
| 286 | png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf)); |
| 287 | #endif |
| 288 | #ifdef PNG_USER_MEM_SUPPORTED |
| 289 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); |
| 290 | #endif /* PNG_USER_MEM_SUPPORTED */ |
| 291 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); |
| 292 | |
| 293 | /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so |
| 294 | * we must recompile any applications that use any older library version. |
| 295 | * For versions after libpng 1.0, we will be compatible, so we need |
| 296 | * only check the first digit. |
| 297 | */ |
| 298 | if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || |
| 299 | (png_libpng_ver[0] == '0' && user_png_ver[2] < '9')) |
| 300 | { |
| 301 | png_error(png_ptr, |
| 302 | "Incompatible libpng version in application and library"); |
| 303 | } |
| 304 | |
| 305 | /* initialize zbuf - compression buffer */ |
| 306 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| 307 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| 308 | (png_uint_32)png_ptr->zbuf_size); |
| 309 | |
| 310 | png_set_write_fn(png_ptr, NULL, NULL, NULL); |
| 311 | |
| 312 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 313 | png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, |
| 314 | 1, NULL, NULL); |
| 315 | #endif |
| 316 | |
| 317 | return ((png_structp)png_ptr); |
| 318 | } |
| 319 | |
| 320 | /* Initialize png_ptr structure, and allocate any memory needed */ |
| 321 | void |
| 322 | png_write_init(png_structp png_ptr) |
| 323 | { |
| 324 | jmp_buf tmp_jmp; /* to save current jump buffer */ |
| 325 | |
| 326 | png_debug(1, "in png_write_init\n"); |
| 327 | /* save jump buffer and error functions */ |
| 328 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
| 329 | |
| 330 | /* reset all variables to 0 */ |
| 331 | png_memset(png_ptr, 0, sizeof (png_struct)); |
| 332 | |
| 333 | /* restore jump buffer */ |
| 334 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
| 335 | |
| 336 | /* initialize zbuf - compression buffer */ |
| 337 | png_ptr->zbuf_size = PNG_ZBUF_SIZE; |
| 338 | png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, |
| 339 | (png_uint_32)png_ptr->zbuf_size); |
| 340 | png_set_write_fn(png_ptr, NULL, NULL, NULL); |
| 341 | |
| 342 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 343 | png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT, |
| 344 | 1, NULL, NULL); |
| 345 | #endif |
| 346 | } |
| 347 | |
| 348 | /* Write a few rows of image data. If the image is interlaced, |
| 349 | * either you will have to write the 7 sub images, or, if you |
| 350 | * have called png_set_interlace_handling(), you will have to |
| 351 | * "write" the image seven times. |
| 352 | */ |
| 353 | void |
| 354 | png_write_rows(png_structp png_ptr, png_bytepp row, |
| 355 | png_uint_32 num_rows) |
| 356 | { |
| 357 | png_uint_32 i; /* row counter */ |
| 358 | png_bytepp rp; /* row pointer */ |
| 359 | |
| 360 | png_debug(1, "in png_write_rows\n"); |
| 361 | /* loop through the rows */ |
| 362 | for (i = 0, rp = row; i < num_rows; i++, rp++) |
| 363 | { |
| 364 | png_write_row(png_ptr, *rp); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /* Write the image. You only need to call this function once, even |
| 369 | * if you are writing an interlaced image. |
| 370 | */ |
| 371 | void |
| 372 | png_write_image(png_structp png_ptr, png_bytepp image) |
| 373 | { |
| 374 | png_uint_32 i; /* row index */ |
| 375 | int pass, num_pass; /* pass variables */ |
| 376 | png_bytepp rp; /* points to current row */ |
| 377 | |
| 378 | png_debug(1, "in png_write_image\n"); |
| 379 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 380 | /* intialize interlace handling. If image is not interlaced, |
| 381 | this will set pass to 1 */ |
| 382 | num_pass = png_set_interlace_handling(png_ptr); |
| 383 | #else |
| 384 | num_pass = 1; |
| 385 | #endif |
| 386 | /* loop through passes */ |
| 387 | for (pass = 0; pass < num_pass; pass++) |
| 388 | { |
| 389 | /* loop through image */ |
| 390 | for (i = 0, rp = image; i < png_ptr->height; i++, rp++) |
| 391 | { |
| 392 | png_write_row(png_ptr, *rp); |
| 393 | } |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | /* called by user to write a row of image data */ |
| 398 | void |
| 399 | png_write_row(png_structp png_ptr, png_bytep row) |
| 400 | { |
| 401 | png_debug2(1, "in png_write_row (row %ld, pass %d)\n", |
| 402 | png_ptr->row_number, png_ptr->pass); |
| 403 | /* initialize transformations and other stuff if first time */ |
| 404 | if (png_ptr->row_number == 0 && png_ptr->pass == 0) |
| 405 | { |
| 406 | /* check for transforms that have been set but were defined out */ |
| 407 | #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED) |
| 408 | if (png_ptr->transformations & PNG_INVERT_MONO) |
| 409 | png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined."); |
| 410 | #endif |
| 411 | #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED) |
| 412 | if (png_ptr->transformations & PNG_FILLER) |
| 413 | png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined."); |
| 414 | #endif |
| 415 | #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED) |
| 416 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 417 | png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined."); |
| 418 | #endif |
| 419 | #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED) |
| 420 | if (png_ptr->transformations & PNG_PACK) |
| 421 | png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined."); |
| 422 | #endif |
| 423 | #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED) |
| 424 | if (png_ptr->transformations & PNG_SHIFT) |
| 425 | png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined."); |
| 426 | #endif |
| 427 | #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED) |
| 428 | if (png_ptr->transformations & PNG_BGR) |
| 429 | png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined."); |
| 430 | #endif |
| 431 | #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED) |
| 432 | if (png_ptr->transformations & PNG_SWAP_BYTES) |
| 433 | png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined."); |
| 434 | #endif |
| 435 | |
| 436 | png_write_start_row(png_ptr); |
| 437 | } |
| 438 | |
| 439 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 440 | /* if interlaced and not interested in row, return */ |
| 441 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 442 | { |
| 443 | switch (png_ptr->pass) |
| 444 | { |
| 445 | case 0: |
| 446 | if (png_ptr->row_number & 7) |
| 447 | { |
| 448 | png_write_finish_row(png_ptr); |
| 449 | return; |
| 450 | } |
| 451 | break; |
| 452 | case 1: |
| 453 | if ((png_ptr->row_number & 7) || png_ptr->width < 5) |
| 454 | { |
| 455 | png_write_finish_row(png_ptr); |
| 456 | return; |
| 457 | } |
| 458 | break; |
| 459 | case 2: |
| 460 | if ((png_ptr->row_number & 7) != 4) |
| 461 | { |
| 462 | png_write_finish_row(png_ptr); |
| 463 | return; |
| 464 | } |
| 465 | break; |
| 466 | case 3: |
| 467 | if ((png_ptr->row_number & 3) || png_ptr->width < 3) |
| 468 | { |
| 469 | png_write_finish_row(png_ptr); |
| 470 | return; |
| 471 | } |
| 472 | break; |
| 473 | case 4: |
| 474 | if ((png_ptr->row_number & 3) != 2) |
| 475 | { |
| 476 | png_write_finish_row(png_ptr); |
| 477 | return; |
| 478 | } |
| 479 | break; |
| 480 | case 5: |
| 481 | if ((png_ptr->row_number & 1) || png_ptr->width < 2) |
| 482 | { |
| 483 | png_write_finish_row(png_ptr); |
| 484 | return; |
| 485 | } |
| 486 | break; |
| 487 | case 6: |
| 488 | if (!(png_ptr->row_number & 1)) |
| 489 | { |
| 490 | png_write_finish_row(png_ptr); |
| 491 | return; |
| 492 | } |
| 493 | break; |
| 494 | } |
| 495 | } |
| 496 | #endif |
| 497 | |
| 498 | /* set up row info for transformations */ |
| 499 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 500 | png_ptr->row_info.width = png_ptr->usr_width; |
| 501 | png_ptr->row_info.channels = png_ptr->usr_channels; |
| 502 | png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth; |
| 503 | png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth * |
| 504 | png_ptr->row_info.channels); |
| 505 | |
| 506 | png_ptr->row_info.rowbytes = ((png_ptr->row_info.width * |
| 507 | (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3); |
| 508 | |
| 509 | png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type); |
| 510 | png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width); |
| 511 | png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels); |
| 512 | png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth); |
| 513 | png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth); |
| 514 | png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes); |
| 515 | |
| 516 | /* Copy user's row into buffer, leaving room for filter byte. */ |
| 517 | png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row, |
| 518 | png_ptr->row_info.rowbytes); |
| 519 | |
| 520 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 521 | /* handle interlacing */ |
| 522 | if (png_ptr->interlaced && png_ptr->pass < 6 && |
| 523 | (png_ptr->transformations & PNG_INTERLACE)) |
| 524 | { |
| 525 | png_do_write_interlace(&(png_ptr->row_info), |
| 526 | png_ptr->row_buf + 1, png_ptr->pass); |
| 527 | /* this should always get caught above, but still ... */ |
| 528 | if (!(png_ptr->row_info.width)) |
| 529 | { |
| 530 | png_write_finish_row(png_ptr); |
| 531 | return; |
| 532 | } |
| 533 | } |
| 534 | #endif |
| 535 | |
| 536 | /* handle other transformations */ |
| 537 | if (png_ptr->transformations) |
| 538 | png_do_write_transformations(png_ptr); |
| 539 | |
| 540 | /* Find a filter if necessary, filter the row and write it out. */ |
| 541 | png_write_find_filter(png_ptr, &(png_ptr->row_info)); |
| 542 | |
| 543 | if (png_ptr->write_row_fn != NULL) |
| 544 | (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass); |
| 545 | } |
| 546 | |
| 547 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 548 | /* Set the automatic flush interval or 0 to turn flushing off */ |
| 549 | void |
| 550 | png_set_flush(png_structp png_ptr, int nrows) |
| 551 | { |
| 552 | png_debug(1, "in png_set_flush\n"); |
| 553 | png_ptr->flush_dist = (nrows < 0 ? 0 : nrows); |
| 554 | } |
| 555 | |
| 556 | /* flush the current output buffers now */ |
| 557 | void |
| 558 | png_write_flush(png_structp png_ptr) |
| 559 | { |
| 560 | int wrote_IDAT; |
| 561 | |
| 562 | png_debug(1, "in png_write_flush\n"); |
| 563 | /* We have already written out all of the data */ |
| 564 | if (png_ptr->row_number >= png_ptr->num_rows) |
| 565 | return; |
| 566 | |
| 567 | do |
| 568 | { |
| 569 | int ret; |
| 570 | |
| 571 | /* compress the data */ |
| 572 | ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); |
| 573 | wrote_IDAT = 0; |
| 574 | |
| 575 | /* check for compression errors */ |
| 576 | if (ret != Z_OK) |
| 577 | { |
| 578 | if (png_ptr->zstream.msg != NULL) |
| 579 | png_error(png_ptr, png_ptr->zstream.msg); |
| 580 | else |
| 581 | png_error(png_ptr, "zlib error"); |
| 582 | } |
| 583 | |
| 584 | if (!(png_ptr->zstream.avail_out)) |
| 585 | { |
| 586 | /* write the IDAT and reset the zlib output buffer */ |
| 587 | png_write_IDAT(png_ptr, png_ptr->zbuf, |
| 588 | png_ptr->zbuf_size); |
| 589 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 590 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 591 | wrote_IDAT = 1; |
| 592 | } |
| 593 | } while(wrote_IDAT == 1); |
| 594 | |
| 595 | /* If there is any data left to be output, write it into a new IDAT */ |
| 596 | if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) |
| 597 | { |
| 598 | /* write the IDAT and reset the zlib output buffer */ |
| 599 | png_write_IDAT(png_ptr, png_ptr->zbuf, |
| 600 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
| 601 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 602 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 603 | } |
| 604 | png_ptr->flush_rows = 0; |
| 605 | png_flush(png_ptr); |
| 606 | } |
| 607 | #endif /* PNG_WRITE_FLUSH_SUPPORTED */ |
| 608 | |
| 609 | /* free all memory used by the write */ |
| 610 | void |
| 611 | png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) |
| 612 | { |
| 613 | png_structp png_ptr = NULL; |
| 614 | png_infop info_ptr = NULL; |
| 615 | #ifdef PNG_USER_MEM_SUPPORTED |
| 616 | png_free_ptr free_fn = NULL; |
| 617 | #endif |
| 618 | |
| 619 | png_debug(1, "in png_destroy_write_struct\n"); |
| 620 | if (png_ptr_ptr != NULL) |
| 621 | { |
| 622 | png_ptr = *png_ptr_ptr; |
| 623 | #ifdef PNG_USER_MEM_SUPPORTED |
| 624 | free_fn = png_ptr->free_fn; |
| 625 | #endif |
| 626 | } |
| 627 | |
| 628 | if (info_ptr_ptr != NULL) |
| 629 | info_ptr = *info_ptr_ptr; |
| 630 | |
| 631 | if (info_ptr != NULL) |
| 632 | { |
| 633 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
| 634 | png_free(png_ptr, info_ptr->text); |
| 635 | #endif |
| 636 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 637 | png_free(png_ptr, info_ptr->pcal_purpose); |
| 638 | png_free(png_ptr, info_ptr->pcal_units); |
| 639 | if (info_ptr->pcal_params != NULL) |
| 640 | { |
| 641 | int i; |
| 642 | for (i = 0; i < (int)info_ptr->pcal_nparams; i++) |
| 643 | { |
| 644 | png_free(png_ptr, info_ptr->pcal_params[i]); |
| 645 | } |
| 646 | png_free(png_ptr, info_ptr->pcal_params); |
| 647 | } |
| 648 | #endif |
| 649 | #ifdef PNG_USER_MEM_SUPPORTED |
| 650 | png_destroy_struct_2((png_voidp)info_ptr, free_fn); |
| 651 | #else |
| 652 | png_destroy_struct((png_voidp)info_ptr); |
| 653 | #endif |
| 654 | *info_ptr_ptr = (png_infop)NULL; |
| 655 | } |
| 656 | |
| 657 | if (png_ptr != NULL) |
| 658 | { |
| 659 | png_write_destroy(png_ptr); |
| 660 | #ifdef PNG_USER_MEM_SUPPORTED |
| 661 | png_destroy_struct_2((png_voidp)png_ptr, free_fn); |
| 662 | #else |
| 663 | png_destroy_struct((png_voidp)png_ptr); |
| 664 | #endif |
| 665 | *png_ptr_ptr = (png_structp)NULL; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | |
| 670 | /* Free any memory used in png_ptr struct (old method) */ |
| 671 | void |
| 672 | png_write_destroy(png_structp png_ptr) |
| 673 | { |
| 674 | jmp_buf tmp_jmp; /* save jump buffer */ |
| 675 | png_error_ptr error_fn; |
| 676 | png_error_ptr warning_fn; |
| 677 | png_voidp error_ptr; |
| 678 | #ifdef PNG_USER_MEM_SUPPORTED |
| 679 | png_free_ptr free_fn; |
| 680 | #endif |
| 681 | |
| 682 | png_debug(1, "in png_write_destroy\n"); |
| 683 | /* free any memory zlib uses */ |
| 684 | deflateEnd(&png_ptr->zstream); |
| 685 | |
| 686 | /* free our memory. png_free checks NULL for us. */ |
| 687 | png_free(png_ptr, png_ptr->zbuf); |
| 688 | png_free(png_ptr, png_ptr->row_buf); |
| 689 | png_free(png_ptr, png_ptr->prev_row); |
| 690 | png_free(png_ptr, png_ptr->sub_row); |
| 691 | png_free(png_ptr, png_ptr->up_row); |
| 692 | png_free(png_ptr, png_ptr->avg_row); |
| 693 | png_free(png_ptr, png_ptr->paeth_row); |
| 694 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 695 | png_free(png_ptr, png_ptr->time_buffer); |
| 696 | #endif /* PNG_TIME_RFC1123_SUPPORTED */ |
| 697 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 698 | png_free(png_ptr, png_ptr->prev_filters); |
| 699 | png_free(png_ptr, png_ptr->filter_weights); |
| 700 | png_free(png_ptr, png_ptr->inv_filter_weights); |
| 701 | png_free(png_ptr, png_ptr->filter_costs); |
| 702 | png_free(png_ptr, png_ptr->inv_filter_costs); |
| 703 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 704 | |
| 705 | /* reset structure */ |
| 706 | png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf)); |
| 707 | |
| 708 | error_fn = png_ptr->error_fn; |
| 709 | warning_fn = png_ptr->warning_fn; |
| 710 | error_ptr = png_ptr->error_ptr; |
| 711 | #ifdef PNG_USER_MEM_SUPPORTED |
| 712 | free_fn = png_ptr->free_fn; |
| 713 | #endif |
| 714 | |
| 715 | png_memset(png_ptr, 0, sizeof (png_struct)); |
| 716 | |
| 717 | png_ptr->error_fn = error_fn; |
| 718 | png_ptr->warning_fn = warning_fn; |
| 719 | png_ptr->error_ptr = error_ptr; |
| 720 | #ifdef PNG_USER_MEM_SUPPORTED |
| 721 | png_ptr->free_fn = free_fn; |
| 722 | #endif |
| 723 | |
| 724 | png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf)); |
| 725 | } |
| 726 | |
| 727 | /* Allow the application to select one or more row filters to use. */ |
| 728 | void |
| 729 | png_set_filter(png_structp png_ptr, int method, int filters) |
| 730 | { |
| 731 | png_debug(1, "in png_set_filter\n"); |
| 732 | /* We allow 'method' only for future expansion of the base filter method. */ |
| 733 | if (method == PNG_FILTER_TYPE_BASE) |
| 734 | { |
| 735 | switch (filters & (PNG_ALL_FILTERS | 0x07)) |
| 736 | { |
| 737 | case 5: |
| 738 | case 6: |
| 739 | case 7: png_warning(png_ptr, "Unknown row filter for method 0"); |
| 740 | case PNG_FILTER_VALUE_NONE: png_ptr->do_filter=PNG_FILTER_NONE; break; |
| 741 | case PNG_FILTER_VALUE_SUB: png_ptr->do_filter=PNG_FILTER_SUB; break; |
| 742 | case PNG_FILTER_VALUE_UP: png_ptr->do_filter=PNG_FILTER_UP; break; |
| 743 | case PNG_FILTER_VALUE_AVG: png_ptr->do_filter=PNG_FILTER_AVG; break; |
| 744 | case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break; |
| 745 | default: png_ptr->do_filter = (png_byte)filters; break; |
| 746 | } |
| 747 | |
| 748 | /* If we have allocated the row_buf, this means we have already started |
| 749 | * with the image and we should have allocated all of the filter buffers |
| 750 | * that have been selected. If prev_row isn't already allocated, then |
| 751 | * it is too late to start using the filters that need it, since we |
| 752 | * will be missing the data in the previous row. If an application |
| 753 | * wants to start and stop using particular filters during compression, |
| 754 | * it should start out with all of the filters, and then add and |
| 755 | * remove them after the start of compression. |
| 756 | */ |
| 757 | if (png_ptr->row_buf != NULL) |
| 758 | { |
| 759 | if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL) |
| 760 | { |
| 761 | png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, |
| 762 | (png_ptr->rowbytes + 1)); |
| 763 | png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB; |
| 764 | } |
| 765 | |
| 766 | if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL) |
| 767 | { |
| 768 | if (png_ptr->prev_row == NULL) |
| 769 | { |
| 770 | png_warning(png_ptr, "Can't add Up filter after starting"); |
| 771 | png_ptr->do_filter &= ~PNG_FILTER_UP; |
| 772 | } |
| 773 | else |
| 774 | { |
| 775 | png_ptr->up_row = (png_bytep)png_malloc(png_ptr, |
| 776 | (png_ptr->rowbytes + 1)); |
| 777 | png_ptr->up_row[0] = PNG_FILTER_VALUE_UP; |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL) |
| 782 | { |
| 783 | if (png_ptr->prev_row == NULL) |
| 784 | { |
| 785 | png_warning(png_ptr, "Can't add Average filter after starting"); |
| 786 | png_ptr->do_filter &= ~PNG_FILTER_AVG; |
| 787 | } |
| 788 | else |
| 789 | { |
| 790 | png_ptr->avg_row = (png_bytep)png_malloc(png_ptr, |
| 791 | (png_ptr->rowbytes + 1)); |
| 792 | png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | if (png_ptr->do_filter & PNG_FILTER_PAETH && |
| 797 | png_ptr->paeth_row == NULL) |
| 798 | { |
| 799 | if (png_ptr->prev_row == NULL) |
| 800 | { |
| 801 | png_warning(png_ptr, "Can't add Paeth filter after starting"); |
| 802 | png_ptr->do_filter &= ~PNG_FILTER_PAETH; |
| 803 | } |
| 804 | else |
| 805 | { |
| 806 | png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr, |
| 807 | (png_ptr->rowbytes + 1)); |
| 808 | png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH; |
| 809 | } |
| 810 | } |
| 811 | |
| 812 | if (png_ptr->do_filter == PNG_NO_FILTERS) |
| 813 | png_ptr->do_filter = PNG_FILTER_NONE; |
| 814 | } |
| 815 | } |
| 816 | else |
| 817 | png_error(png_ptr, "Unknown custom filter method"); |
| 818 | } |
| 819 | |
| 820 | /* This allows us to influence the way in which libpng chooses the "best" |
| 821 | * filter for the current scanline. While the "minimum-sum-of-absolute- |
| 822 | * differences metric is relatively fast and effective, there is some |
| 823 | * question as to whether it can be improved upon by trying to keep the |
| 824 | * filtered data going to zlib more consistent, hopefully resulting in |
| 825 | * better compression. |
| 826 | */ |
| 827 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */ |
| 828 | void |
| 829 | png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, |
| 830 | int num_weights, png_doublep filter_weights, |
| 831 | png_doublep filter_costs) |
| 832 | { |
| 833 | int i; |
| 834 | |
| 835 | png_debug(1, "in png_set_filter_heuristics\n"); |
| 836 | if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST) |
| 837 | { |
| 838 | png_warning(png_ptr, "Unknown filter heuristic method"); |
| 839 | return; |
| 840 | } |
| 841 | |
| 842 | if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT) |
| 843 | { |
| 844 | heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED; |
| 845 | } |
| 846 | |
| 847 | if (num_weights < 0 || filter_weights == NULL || |
| 848 | heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED) |
| 849 | { |
| 850 | num_weights = 0; |
| 851 | } |
| 852 | |
| 853 | png_ptr->num_prev_filters = num_weights; |
| 854 | png_ptr->heuristic_method = heuristic_method; |
| 855 | |
| 856 | if (num_weights > 0) |
| 857 | { |
| 858 | if (png_ptr->prev_filters == NULL) |
| 859 | { |
| 860 | png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, |
| 861 | (png_uint_32)(sizeof(png_byte) * num_weights)); |
| 862 | |
| 863 | /* To make sure that the weighting starts out fairly */ |
| 864 | for (i = 0; i < num_weights; i++) |
| 865 | { |
| 866 | png_ptr->prev_filters[i] = 255; |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | if (png_ptr->filter_weights == NULL) |
| 871 | { |
| 872 | png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr, |
| 873 | (png_uint_32)(sizeof(png_uint_16) * num_weights)); |
| 874 | |
| 875 | png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr, |
| 876 | (png_uint_32)(sizeof(png_uint_16) * num_weights)); |
| 877 | |
| 878 | for (i = 0; i < num_weights; i++) |
| 879 | { |
| 880 | png_ptr->inv_filter_weights[i] = |
| 881 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | for (i = 0; i < num_weights; i++) |
| 886 | { |
| 887 | if (filter_weights[i] < 0.0) |
| 888 | { |
| 889 | png_ptr->inv_filter_weights[i] = |
| 890 | png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR; |
| 891 | } |
| 892 | else |
| 893 | { |
| 894 | png_ptr->inv_filter_weights[i] = |
| 895 | (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5); |
| 896 | png_ptr->filter_weights[i] = |
| 897 | (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5); |
| 898 | } |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | /* If, in the future, there are other filter methods, this would |
| 903 | * need to be based on png_ptr->filter. |
| 904 | */ |
| 905 | if (png_ptr->filter_costs == NULL) |
| 906 | { |
| 907 | png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr, |
| 908 | (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); |
| 909 | |
| 910 | png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr, |
| 911 | (png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); |
| 912 | |
| 913 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) |
| 914 | { |
| 915 | png_ptr->inv_filter_costs[i] = |
| 916 | png_ptr->filter_costs[i] = PNG_COST_FACTOR; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | /* Here is where we set the relative costs of the different filters. We |
| 921 | * should take the desired compression level into account when setting |
| 922 | * the costs, so that Paeth, for instance, has a high relative cost at low |
| 923 | * compression levels, while it has a lower relative cost at higher |
| 924 | * compression settings. The filter types are in order of increasing |
| 925 | * relative cost, so it would be possible to do this with an algorithm. |
| 926 | */ |
| 927 | for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) |
| 928 | { |
| 929 | if (filter_costs == NULL || filter_costs[i] < 0.0) |
| 930 | { |
| 931 | png_ptr->inv_filter_costs[i] = |
| 932 | png_ptr->filter_costs[i] = PNG_COST_FACTOR; |
| 933 | } |
| 934 | else if (filter_costs[i] >= 1.0) |
| 935 | { |
| 936 | png_ptr->inv_filter_costs[i] = |
| 937 | (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5); |
| 938 | png_ptr->filter_costs[i] = |
| 939 | (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5); |
| 940 | } |
| 941 | } |
| 942 | } |
| 943 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 944 | |
| 945 | void |
| 946 | png_set_compression_level(png_structp png_ptr, int level) |
| 947 | { |
| 948 | png_debug(1, "in png_set_compression_level\n"); |
| 949 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; |
| 950 | png_ptr->zlib_level = level; |
| 951 | } |
| 952 | |
| 953 | void |
| 954 | png_set_compression_mem_level(png_structp png_ptr, int mem_level) |
| 955 | { |
| 956 | png_debug(1, "in png_set_compression_mem_level\n"); |
| 957 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; |
| 958 | png_ptr->zlib_mem_level = mem_level; |
| 959 | } |
| 960 | |
| 961 | void |
| 962 | png_set_compression_strategy(png_structp png_ptr, int strategy) |
| 963 | { |
| 964 | png_debug(1, "in png_set_compression_strategy\n"); |
| 965 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; |
| 966 | png_ptr->zlib_strategy = strategy; |
| 967 | } |
| 968 | |
| 969 | void |
| 970 | png_set_compression_window_bits(png_structp png_ptr, int window_bits) |
| 971 | { |
| 972 | if (window_bits > 15) |
| 973 | png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); |
| 974 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; |
| 975 | png_ptr->zlib_window_bits = window_bits; |
| 976 | } |
| 977 | |
| 978 | void |
| 979 | png_set_compression_method(png_structp png_ptr, int method) |
| 980 | { |
| 981 | png_debug(1, "in png_set_compression_method\n"); |
| 982 | if (method != 8) |
| 983 | png_warning(png_ptr, "Only compression method 8 is supported by PNG"); |
| 984 | png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; |
| 985 | png_ptr->zlib_method = method; |
| 986 | } |
| 987 | |
| 988 | void |
| 989 | png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) |
| 990 | { |
| 991 | png_ptr->write_row_fn = write_row_fn; |
| 992 | } |
| 993 | |
| 994 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 995 | void |
| 996 | png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr |
| 997 | write_user_transform_fn) |
| 998 | { |
| 999 | png_debug(1, "in png_set_write_user_transform_fn\n"); |
| 1000 | png_ptr->transformations |= PNG_USER_TRANSFORM; |
| 1001 | png_ptr->write_user_transform_fn = write_user_transform_fn; |
| 1002 | } |
| 1003 | #endif |
| 1004 | |