src/png/pngpriv.h

   1
   2 /* pngpriv.h - private declarations for use inside libpng
   3  *
   4  * libpng version 1.4.4 - September 23, 2010
   5  * For conditions of distribution and use, see copyright notice in png.h
   6  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
   7  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
   8  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
   9  *
  10  * This code is released under the libpng license.
  11  * For conditions of distribution and use, see the disclaimer
  12  * and license in png.h
  13  */
  14
  15 /* The symbols declared in this file (including the functions declared
  16  * as PNG_EXTERN) are PRIVATE.  They are not part of the libpng public
  17  * interface, and are not recommended for use by regular applications.
  18  * Some of them may become public in the future; others may stay private,
  19  * change in an incompatible way, or even disappear.
  20  * Although the libpng users are not forbidden to include this header,
  21  * they should be well aware of the issues that may arise from doing so.
  22  */
  23
  24 #ifndef PNGPRIV_H
  25 #define PNGPRIV_H
  26
  27 #ifndef PNG_VERSION_INFO_ONLY
  28
  29 #include <stdlib.h>
  30
  31 #ifndef PNG_EXTERN
  32 /* The functions exported by PNG_EXTERN are internal functions, which
  33  * aren't usually used outside the library (as far as I know), so it is
  34  * debatable if they should be exported at all.  In the future, when it
  35  * is possible to have run-time registry of chunk-handling functions,
  36  * some of these will be made available again.
  37 #  define PNG_EXTERN extern
  38  */
  39 #  define PNG_EXTERN
  40 #endif
  41
  42 /* Other defines specific to compilers can go here.  Try to keep
  43  * them inside an appropriate ifdef/endif pair for portability.
  44  */
  45
  46 #ifdef PNG_FLOATING_POINT_SUPPORTED
  47 #  ifdef MACOS && !wxOSX_USE_IPHONE
  48      /* We need to check that <math.h> hasn't already been included earlier
  49       * as it seems it doesn't agree with <fp.h>, yet we should really use
  50       * <fp.h> if possible.
  51       */
  52 #    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
  53 #      include <fp.h>
  54 #    endif
  55 #  else
  56 #    include <math.h>
  57 #  endif
  58 #  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
  59      /* Amiga SAS/C: We must include builtin FPU functions when compiling using
  60       * MATH=68881
  61       */
  62 #    include <m68881.h>
  63 #  endif
  64 #endif
  65
  66 /* Codewarrior on NT has linking problems without this. */
  67 #if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
  68 #  define PNG_ALWAYS_EXTERN
  69 #endif
  70
  71 /* This provides the non-ANSI (far) memory allocation routines. */
  72 #if defined(__TURBOC__) && defined(__MSDOS__)
  73 #  include <mem.h>
  74 #  include <alloc.h>
  75 #endif
  76
  77 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
  78     defined(_WIN32) || defined(__WIN32__)
  79 #  include <windows.h>  /* defines _WINDOWS_ macro */
  80 #endif
  81
  82 /* Various modes of operation.  Note that after an init, mode is set to
  83  * zero automatically when the structure is created.
  84  */
  85 #define PNG_HAVE_IHDR               0x01
  86 #define PNG_HAVE_PLTE               0x02
  87 #define PNG_HAVE_IDAT               0x04
  88 #define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
  89 #define PNG_HAVE_IEND               0x10
  90 #define PNG_HAVE_gAMA               0x20
  91 #define PNG_HAVE_cHRM               0x40
  92 #define PNG_HAVE_sRGB               0x80
  93 #define PNG_HAVE_CHUNK_HEADER      0x100
  94 #define PNG_WROTE_tIME             0x200
  95 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
  96 #define PNG_BACKGROUND_IS_GRAY     0x800
  97 #define PNG_HAVE_PNG_SIGNATURE    0x1000
  98 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
  99
 100 /* Flags for the transformations the PNG library does on the image data */
 101 #define PNG_BGR                 0x0001
 102 #define PNG_INTERLACE           0x0002
 103 #define PNG_PACK                0x0004
 104 #define PNG_SHIFT               0x0008
 105 #define PNG_SWAP_BYTES          0x0010
 106 #define PNG_INVERT_MONO         0x0020
 107 #define PNG_QUANTIZE            0x0040 /* formerly PNG_DITHER */
 108 #define PNG_BACKGROUND          0x0080
 109 #define PNG_BACKGROUND_EXPAND   0x0100
 110                           /*    0x0200 unused */
 111 #define PNG_16_TO_8             0x0400
 112 #define PNG_RGBA                0x0800
 113 #define PNG_EXPAND              0x1000
 114 #define PNG_GAMMA               0x2000
 115 #define PNG_GRAY_TO_RGB         0x4000
 116 #define PNG_FILLER              0x8000L
 117 #define PNG_PACKSWAP           0x10000L
 118 #define PNG_SWAP_ALPHA         0x20000L
 119 #define PNG_STRIP_ALPHA        0x40000L
 120 #define PNG_INVERT_ALPHA       0x80000L
 121 #define PNG_USER_TRANSFORM    0x100000L
 122 #define PNG_RGB_TO_GRAY_ERR   0x200000L
 123 #define PNG_RGB_TO_GRAY_WARN  0x400000L
 124 #define PNG_RGB_TO_GRAY       0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
 125                        /*     0x800000L     Unused */
 126 #define PNG_ADD_ALPHA         0x1000000L  /* Added to libpng-1.2.7 */
 127 #define PNG_EXPAND_tRNS       0x2000000L  /* Added to libpng-1.2.9 */
 128                        /*   0x4000000L  unused */
 129                        /*   0x8000000L  unused */
 130                        /*  0x10000000L  unused */
 131                        /*  0x20000000L  unused */
 132                        /*  0x40000000L  unused */
 133
 134 /* Flags for png_create_struct */
 135 #define PNG_STRUCT_PNG   0x0001
 136 #define PNG_STRUCT_INFO  0x0002
 137
 138 /* Scaling factor for filter heuristic weighting calculations */
 139 #define PNG_WEIGHT_SHIFT 8
 140 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
 141 #define PNG_COST_SHIFT 3
 142 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
 143
 144 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
 145 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
 146 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
 147 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
 148 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
 149 #define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
 150 #define PNG_FLAG_ZLIB_FINISHED            0x0020
 151 #define PNG_FLAG_ROW_INIT                 0x0040
 152 #define PNG_FLAG_FILLER_AFTER             0x0080
 153 #define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
 154 #define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
 155 #define PNG_FLAG_CRC_CRITICAL_USE         0x0400
 156 #define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
 157                                 /*        0x1000  unused */
 158                                 /*        0x2000  unused */
 159                                 /*        0x4000  unused */
 160 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
 161 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
 162 #define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
 163 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
 164 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
 165 #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
 166 #define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
 167 #define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
 168 #define PNG_FLAG_BENIGN_ERRORS_WARN       0x800000L  /* Added to libpng-1.4.0 */
 169                                   /*     0x1000000L  unused */
 170                                   /*     0x2000000L  unused */
 171                                   /*     0x4000000L  unused */
 172                                   /*     0x8000000L  unused */
 173                                   /*    0x10000000L  unused */
 174                                   /*    0x20000000L  unused */
 175                                   /*    0x40000000L  unused */
 176
 177 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
 178                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
 179
 180 #define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
 181                                      PNG_FLAG_CRC_CRITICAL_IGNORE)
 182
 183 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
 184                                      PNG_FLAG_CRC_CRITICAL_MASK)
 185
 186 /* Save typing and make code easier to understand */
 187
 188 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
 189    abs((int)((c1).green) - (int)((c2).green)) + \
 190    abs((int)((c1).blue) - (int)((c2).blue)))
 191
 192 /* Added to libpng-1.2.6 JB */
 193 #define PNG_ROWBYTES(pixel_bits, width) \
 194     ((pixel_bits) >= 8 ? \
 195     ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
 196     (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
 197
 198 /* PNG_OUT_OF_RANGE returns true if value is outside the range
 199  * ideal-delta..ideal+delta.  Each argument is evaluated twice.
 200  * "ideal" and "delta" should be constants, normally simple
 201  * integers, "value" a variable. Added to libpng-1.2.6 JB
 202  */
 203 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
 204         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
 205
 206 /* Constant strings for known chunk types.  If you need to add a chunk,
 207  * define the name here, and add an invocation of the macro wherever it's
 208  * needed.
 209  */
 210 #define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
 211 #define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
 212 #define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
 213 #define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
 214 #define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
 215 #define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
 216 #define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
 217 #define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
 218 #define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
 219 #define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
 220 #define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
 221 #define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
 222 #define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
 223 #define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
 224 #define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
 225 #define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
 226 #define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
 227 #define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115,  84,  69,  82, '\0'}
 228 #define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
 229 #define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
 230 #define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
 231 #define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
 232
 233
 234 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
 235 #ifdef __cplusplus
 236 extern "C" {
 237 #endif /* __cplusplus */
 238
 239 /* These functions are used internally in the code.  They generally
 240  * shouldn't be used unless you are writing code to add or replace some
 241  * functionality in libpng.  More information about most functions can
 242  * be found in the files where the functions are located.
 243  */
 244
 245 /* Allocate memory for an internal libpng struct */
 246 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
 247
 248 /* Free memory from internal libpng struct */
 249 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
 250
 251 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
 252   malloc_fn, png_voidp mem_ptr));
 253 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
 254    png_free_ptr free_fn, png_voidp mem_ptr));
 255
 256 /* Free any memory that info_ptr points to and reset struct. */
 257 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
 258    png_infop info_ptr));
 259
 260 /* Function to allocate memory for zlib.  PNGAPI is disallowed. */
 261 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
 262
 263 /* Function to free memory for zlib.  PNGAPI is disallowed. */
 264 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
 265
 266 /* Next four functions are used internally as callbacks.  PNGAPI is required
 267  * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
 268
 269 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
 270    png_bytep data, png_size_t length));
 271
 272 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 273 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
 274    png_bytep buffer, png_size_t length));
 275 #endif
 276
 277 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
 278    png_bytep data, png_size_t length));
 279
 280 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 281 #ifdef PNG_STDIO_SUPPORTED
 282 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
 283 #endif
 284 #endif
 285
 286 /* Reset the CRC variable */
 287 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
 288
 289 /* Write the "data" buffer to whatever output you are using */
 290 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
 291    png_size_t length));
 292
 293 /* Read the chunk header (length + type name) */
 294 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
 295
 296 /* Read data from whatever input you are using into the "data" buffer */
 297 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
 298    png_size_t length));
 299
 300 /* Read bytes into buf, and update png_ptr->crc */
 301 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
 302    png_size_t length));
 303
 304 /* Decompress data in a chunk that uses compression */
 305 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
 306     defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
 307 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
 308    int comp_type, png_size_t chunklength, png_size_t prefix_length,
 309    png_size_t *data_length));
 310 #endif
 311
 312 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
 313 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
 314
 315 /* Read the CRC from the file and compare it to the libpng calculated CRC */
 316 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
 317
 318 /* Calculate the CRC over a section of data.  Note that we are only
 319  * passing a maximum of 64K on systems that have this as a memory limit,
 320  * since this is the maximum buffer size we can specify.
 321  */
 322 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 323    png_size_t length));
 324
 325 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 326 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 327 #endif
 328
 329 /* Write various chunks */
 330
 331 /* Write the IHDR chunk, and update the png_struct with the necessary
 332  * information.
 333  */
 334 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
 335    png_uint_32 height,
 336    int bit_depth, int color_type, int compression_method, int filter_method,
 337    int interlace_method));
 338
 339 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
 340    png_uint_32 num_pal));
 341
 342 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
 343    png_size_t length));
 344
 345 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
 346
 347 #ifdef PNG_WRITE_gAMA_SUPPORTED
 348 #ifdef PNG_FLOATING_POINT_SUPPORTED
 349 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
 350 #endif
 351 #ifdef PNG_FIXED_POINT_SUPPORTED
 352 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
 353     png_fixed_point file_gamma));
 354 #endif
 355 #endif
 356
 357 #ifdef PNG_WRITE_sBIT_SUPPORTED
 358 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
 359    int color_type));
 360 #endif
 361
 362 #ifdef PNG_WRITE_cHRM_SUPPORTED
 363 #ifdef PNG_FLOATING_POINT_SUPPORTED
 364 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
 365    double white_x, double white_y,
 366    double red_x, double red_y, double green_x, double green_y,
 367    double blue_x, double blue_y));
 368 #endif
 369 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
 370    png_fixed_point int_white_x, png_fixed_point int_white_y,
 371    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
 372    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
 373    png_fixed_point int_blue_y));
 374 #endif
 375
 376 #ifdef PNG_WRITE_sRGB_SUPPORTED
 377 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
 378    int intent));
 379 #endif
 380
 381 #ifdef PNG_WRITE_iCCP_SUPPORTED
 382 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
 383    png_charp name, int compression_type,
 384    png_charp profile, int proflen));
 385    /* Note to maintainer: profile should be png_bytep */
 386 #endif
 387
 388 #ifdef PNG_WRITE_sPLT_SUPPORTED
 389 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
 390    png_sPLT_tp palette));
 391 #endif
 392
 393 #ifdef PNG_WRITE_tRNS_SUPPORTED
 394 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
 395    png_color_16p values, int number, int color_type));
 396 #endif
 397
 398 #ifdef PNG_WRITE_bKGD_SUPPORTED
 399 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
 400    png_color_16p values, int color_type));
 401 #endif
 402
 403 #ifdef PNG_WRITE_hIST_SUPPORTED
 404 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
 405    int num_hist));
 406 #endif
 407
 408 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
 409     defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
 410 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
 411    png_charp key, png_charpp new_key));
 412 #endif
 413
 414 #ifdef PNG_WRITE_tEXt_SUPPORTED
 415 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
 416    png_charp text, png_size_t text_len));
 417 #endif
 418
 419 #ifdef PNG_WRITE_zTXt_SUPPORTED
 420 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
 421    png_charp text, png_size_t text_len, int compression));
 422 #endif
 423
 424 #ifdef PNG_WRITE_iTXt_SUPPORTED
 425 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
 426    int compression, png_charp key, png_charp lang, png_charp lang_key,
 427    png_charp text));
 428 #endif
 429
 430 #ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
 431 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
 432    png_infop info_ptr, png_textp text_ptr, int num_text));
 433 #endif
 434
 435 #ifdef PNG_WRITE_oFFs_SUPPORTED
 436 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
 437    png_int_32 x_offset, png_int_32 y_offset, int unit_type));
 438 #endif
 439
 440 #ifdef PNG_WRITE_pCAL_SUPPORTED
 441 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
 442    png_int_32 X0, png_int_32 X1, int type, int nparams,
 443    png_charp units, png_charpp params));
 444 #endif
 445
 446 #ifdef PNG_WRITE_pHYs_SUPPORTED
 447 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
 448    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
 449    int unit_type));
 450 #endif
 451
 452 #ifdef PNG_WRITE_tIME_SUPPORTED
 453 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
 454    png_timep mod_time));
 455 #endif
 456
 457 #ifdef PNG_WRITE_sCAL_SUPPORTED
 458 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
 459 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
 460    int unit, double width, double height));
 461 #else
 462 #ifdef PNG_FIXED_POINT_SUPPORTED
 463 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
 464    int unit, png_charp width, png_charp height));
 465 #endif
 466 #endif
 467 #endif
 468
 469 /* Called when finished processing a row of data */
 470 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
 471
 472 /* Internal use only.   Called before first row of data */
 473 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
 474
 475 #ifdef PNG_READ_GAMMA_SUPPORTED
 476 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
 477    png_byte bit_depth));
 478 #endif
 479
 480 /* Combine a row of data, dealing with alpha, etc. if requested */
 481 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
 482    int mask));
 483
 484 #ifdef PNG_READ_INTERLACING_SUPPORTED
 485 /* Expand an interlaced row */
 486 /* OLD pre-1.0.9 interface:
 487 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
 488    png_bytep row, int pass, png_uint_32 transformations));
 489  */
 490 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
 491 #endif
 492
 493 /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
 494
 495 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
 496 /* Grab pixels out of a row for an interlaced pass */
 497 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
 498    png_bytep row, int pass));
 499 #endif
 500
 501 /* Unfilter a row */
 502 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
 503    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
 504
 505 /* Choose the best filter to use and filter the row data */
 506 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
 507    png_row_infop row_info));
 508
 509 /* Write out the filtered row. */
 510 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
 511    png_bytep filtered_row));
 512 /* Finish a row while reading, dealing with interlacing passes, etc. */
 513 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
 514
 515 /* Initialize the row buffers, etc. */
 516 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
 517 /* Optional call to update the users info structure */
 518 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
 519    png_infop info_ptr));
 520
 521 /* These are the functions that do the transformations */
 522 #ifdef PNG_READ_FILLER_SUPPORTED
 523 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
 524    png_bytep row, png_uint_32 filler, png_uint_32 flags));
 525 #endif
 526
 527 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
 528 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
 529    png_bytep row));
 530 #endif
 531
 532 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
 533 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
 534    png_bytep row));
 535 #endif
 536
 537 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
 538 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
 539    png_bytep row));
 540 #endif
 541
 542 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
 543 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
 544    png_bytep row));
 545 #endif
 546
 547 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
 548     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 549 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
 550    png_bytep row, png_uint_32 flags));
 551 #endif
 552
 553 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 554 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
 555 #endif
 556
 557 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
 558     defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 559 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
 560 #endif
 561
 562 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 563 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
 564    row_info, png_bytep row));
 565 #endif
 566
 567 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
 568 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
 569    png_bytep row));
 570 #endif
 571
 572 #ifdef PNG_READ_PACK_SUPPORTED
 573 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
 574 #endif
 575
 576 #ifdef PNG_READ_SHIFT_SUPPORTED
 577 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
 578    png_color_8p sig_bits));
 579 #endif
 580
 581 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 582 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
 583 #endif
 584
 585 #ifdef PNG_READ_16_TO_8_SUPPORTED
 586 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
 587 #endif
 588
 589 #ifdef PNG_READ_QUANTIZE_SUPPORTED
 590 PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
 591    png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
 592
 593 #  ifdef PNG_CORRECT_PALETTE_SUPPORTED
 594 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
 595    png_colorp palette, int num_palette));
 596 #  endif
 597 #endif
 598
 599 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 600 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
 601 #endif
 602
 603 #ifdef PNG_WRITE_PACK_SUPPORTED
 604 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
 605    png_bytep row, png_uint_32 bit_depth));
 606 #endif
 607
 608 #ifdef PNG_WRITE_SHIFT_SUPPORTED
 609 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
 610    png_color_8p bit_depth));
 611 #endif
 612
 613 #ifdef PNG_READ_BACKGROUND_SUPPORTED
 614 #ifdef PNG_READ_GAMMA_SUPPORTED
 615 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
 616    png_color_16p trans_color, png_color_16p background,
 617    png_color_16p background_1,
 618    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
 619    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
 620    png_uint_16pp gamma_16_to_1, int gamma_shift));
 621 #else
 622 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
 623    png_color_16p trans_color, png_color_16p background));
 624 #endif
 625 #endif
 626
 627 #ifdef PNG_READ_GAMMA_SUPPORTED
 628 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
 629    png_bytep gamma_table, png_uint_16pp gamma_16_table,
 630    int gamma_shift));
 631 #endif
 632
 633 #ifdef PNG_READ_EXPAND_SUPPORTED
 634 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
 635    png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
 636 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
 637    png_bytep row, png_color_16p trans_value));
 638 #endif
 639
 640 /* The following decodes the appropriate chunks, and does error correction,
 641  * then calls the appropriate callback for the chunk if it is valid.
 642  */
 643
 644 /* Decode the IHDR chunk */
 645 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
 646    png_uint_32 length));
 647 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
 648    png_uint_32 length));
 649 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
 650    png_uint_32 length));
 651
 652 #ifdef PNG_READ_bKGD_SUPPORTED
 653 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
 654    png_uint_32 length));
 655 #endif
 656
 657 #ifdef PNG_READ_cHRM_SUPPORTED
 658 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
 659    png_uint_32 length));
 660 #endif
 661
 662 #ifdef PNG_READ_gAMA_SUPPORTED
 663 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
 664    png_uint_32 length));
 665 #endif
 666
 667 #ifdef PNG_READ_hIST_SUPPORTED
 668 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
 669    png_uint_32 length));
 670 #endif
 671
 672 #ifdef PNG_READ_iCCP_SUPPORTED
 673 PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
 674    png_uint_32 length));
 675 #endif /* PNG_READ_iCCP_SUPPORTED */
 676
 677 #ifdef PNG_READ_iTXt_SUPPORTED
 678 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 679    png_uint_32 length));
 680 #endif
 681
 682 #ifdef PNG_READ_oFFs_SUPPORTED
 683 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
 684    png_uint_32 length));
 685 #endif
 686
 687 #ifdef PNG_READ_pCAL_SUPPORTED
 688 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
 689    png_uint_32 length));
 690 #endif
 691
 692 #ifdef PNG_READ_pHYs_SUPPORTED
 693 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
 694    png_uint_32 length));
 695 #endif
 696
 697 #ifdef PNG_READ_sBIT_SUPPORTED
 698 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
 699    png_uint_32 length));
 700 #endif
 701
 702 #ifdef PNG_READ_sCAL_SUPPORTED
 703 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
 704    png_uint_32 length));
 705 #endif
 706
 707 #ifdef PNG_READ_sPLT_SUPPORTED
 708 PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
 709    png_uint_32 length));
 710 #endif /* PNG_READ_sPLT_SUPPORTED */
 711
 712 #ifdef PNG_READ_sRGB_SUPPORTED
 713 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
 714    png_uint_32 length));
 715 #endif
 716
 717 #ifdef PNG_READ_tEXt_SUPPORTED
 718 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 719    png_uint_32 length));
 720 #endif
 721
 722 #ifdef PNG_READ_tIME_SUPPORTED
 723 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
 724    png_uint_32 length));
 725 #endif
 726
 727 #ifdef PNG_READ_tRNS_SUPPORTED
 728 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
 729    png_uint_32 length));
 730 #endif
 731
 732 #ifdef PNG_READ_zTXt_SUPPORTED
 733 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 734    png_uint_32 length));
 735 #endif
 736
 737 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
 738    png_infop info_ptr, png_uint_32 length));
 739
 740 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
 741    png_bytep chunk_name));
 742
 743 /* Handle the transformations for reading and writing */
 744 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
 745 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
 746
 747 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
 748
 749 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 750 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
 751    png_infop info_ptr));
 752 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
 753    png_infop info_ptr));
 754 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
 755 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
 756    png_uint_32 length));
 757 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
 758 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
 759 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
 760    png_bytep buffer, png_size_t buffer_length));
 761 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
 762 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
 763    png_bytep buffer, png_size_t buffer_length));
 764 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
 765 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
 766    png_infop info_ptr, png_uint_32 length));
 767 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
 768    png_infop info_ptr));
 769 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
 770    png_infop info_ptr));
 771 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
 772 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
 773    png_infop info_ptr));
 774 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
 775    png_infop info_ptr));
 776 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
 777 #ifdef PNG_READ_tEXt_SUPPORTED
 778 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
 779    png_infop info_ptr, png_uint_32 length));
 780 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
 781    png_infop info_ptr));
 782 #endif
 783 #ifdef PNG_READ_zTXt_SUPPORTED
 784 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
 785    png_infop info_ptr, png_uint_32 length));
 786 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
 787    png_infop info_ptr));
 788 #endif
 789 #ifdef PNG_READ_iTXt_SUPPORTED
 790 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
 791    png_infop info_ptr, png_uint_32 length));
 792 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
 793    png_infop info_ptr));
 794 #endif
 795
 796 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 797
 798 #ifdef PNG_MNG_FEATURES_SUPPORTED
 799 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
 800    png_bytep row));
 801 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
 802    png_bytep row));
 803 #endif
 804
 805 /* Added at libpng version 1.4.0 */
 806 #ifdef PNG_cHRM_SUPPORTED
 807 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
 808    png_fixed_point int_white_x, png_fixed_point int_white_y,
 809    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
 810    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
 811    png_fixed_point int_blue_y));
 812 #endif
 813
 814 #ifdef PNG_cHRM_SUPPORTED
 815 #ifdef PNG_CHECK_cHRM_SUPPORTED
 816 /* Added at libpng version 1.2.34 and 1.4.0 */
 817 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
 818    unsigned long *hi_product, unsigned long *lo_product));
 819 #endif
 820 #endif
 821
 822 /* Added at libpng version 1.4.0 */
 823 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
 824    png_uint_32 width, png_uint_32 height, int bit_depth,
 825    int color_type, int interlace_type, int compression_type,
 826    int filter_type));
 827
 828 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */
 829 PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
 830    png_infop end_info_ptr));
 831
 832 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
 833 PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
 834
 835 #ifdef USE_FAR_KEYWORD  /* memory model conversion function */
 836 PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
 837    int check));
 838 #endif /* USE_FAR_KEYWORD */
 839
 840 /* Define PNG_DEBUG at compile time for debugging information.  Higher
 841  * numbers for PNG_DEBUG mean more debugging information.  This has
 842  * only been added since version 0.95 so it is not implemented throughout
 843  * libpng yet, but more support will be added as needed.
 844  */
 845 #ifdef PNG_DEBUG
 846 #if (PNG_DEBUG > 0)
 847 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
 848 #include <crtdbg.h>
 849 #if (PNG_DEBUG > 1)
 850 #ifndef _DEBUG
 851 #  define _DEBUG
 852 #endif
 853 #ifndef png_debug
 854 #define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
 855 #endif
 856 #ifndef png_debug1
 857 #define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
 858 #endif
 859 #ifndef png_debug2
 860 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
 861 #endif
 862 #endif
 863 #else /* PNG_DEBUG_FILE || !_MSC_VER */
 864 #ifndef PNG_DEBUG_FILE
 865 #define PNG_DEBUG_FILE stderr
 866 #endif /* PNG_DEBUG_FILE */
 867
 868 #if (PNG_DEBUG > 1)
 869 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
 870  * non-ISO compilers
 871  */
 872 #  ifdef __STDC__
 873 #    ifndef png_debug
 874 #      define png_debug(l,m) \
 875        { \
 876        int num_tabs=l; \
 877        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 878          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
 879        }
 880 #    endif
 881 #    ifndef png_debug1
 882 #      define png_debug1(l,m,p1) \
 883        { \
 884        int num_tabs=l; \
 885        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 886          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
 887        }
 888 #    endif
 889 #    ifndef png_debug2
 890 #      define png_debug2(l,m,p1,p2) \
 891        { \
 892        int num_tabs=l; \
 893        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 894          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
 895        }
 896 #    endif
 897 #  else /* __STDC __ */
 898 #    ifndef png_debug
 899 #      define png_debug(l,m) \
 900        { \
 901        int num_tabs=l; \
 902        char format[256]; \
 903        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 904          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 905          m,PNG_STRING_NEWLINE); \
 906        fprintf(PNG_DEBUG_FILE,format); \
 907        }
 908 #    endif
 909 #    ifndef png_debug1
 910 #      define png_debug1(l,m,p1) \
 911        { \
 912        int num_tabs=l; \
 913        char format[256]; \
 914        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 915          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 916          m,PNG_STRING_NEWLINE); \
 917        fprintf(PNG_DEBUG_FILE,format,p1); \
 918        }
 919 #    endif
 920 #    ifndef png_debug2
 921 #      define png_debug2(l,m,p1,p2) \
 922        { \
 923        int num_tabs=l; \
 924        char format[256]; \
 925        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 926          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 927          m,PNG_STRING_NEWLINE); \
 928        fprintf(PNG_DEBUG_FILE,format,p1,p2); \
 929        }
 930 #    endif
 931 #  endif /* __STDC __ */
 932 #endif /* (PNG_DEBUG > 1) */
 933
 934 #endif /* _MSC_VER */
 935 #endif /* (PNG_DEBUG > 0) */
 936 #endif /* PNG_DEBUG */
 937 #ifndef png_debug
 938 #define png_debug(l, m)
 939 #endif
 940 #ifndef png_debug1
 941 #define png_debug1(l, m, p1)
 942 #endif
 943 #ifndef png_debug2
 944 #define png_debug2(l, m, p1, p2)
 945 #endif
 946
 947 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 948
 949 #ifdef __cplusplus
 950 }
 951 #endif
 952
 953 #endif /* PNG_VERSION_INFO_ONLY */
 954 #endif /* PNGPRIV_H */