include/reactos/libs/libpng/pngpriv.h

   1
   2 /* pngpriv.h - private declarations for use inside libpng
   3  *
   4  * libpng version 1.4.3 - June 26, 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 /* The functions exported by PNG_EXTERN are internal functions, which
  32  * aren't usually used outside the library (as far as I know), so it is
  33  * debatable if they should be exported at all.  In the future, when it
  34  * is possible to have run-time registry of chunk-handling functions,
  35  * some of these will be made available again.
  36 #define PNG_EXTERN extern
  37  */
  38 #define PNG_EXTERN
  39
  40 /* Other defines specific to compilers can go here.  Try to keep
  41  * them inside an appropriate ifdef/endif pair for portability.
  42  */
  43
  44 #ifdef PNG_FLOATING_POINT_SUPPORTED
  45 #  ifdef MACOS
  46      /* We need to check that <math.h> hasn't already been included earlier
  47       * as it seems it doesn't agree with <fp.h>, yet we should really use
  48       * <fp.h> if possible.
  49       */
  50 #    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
  51 #      include <fp.h>
  52 #    endif
  53 #  else
  54 #    include <math.h>
  55 #  endif
  56 #  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
  57      /* Amiga SAS/C: We must include builtin FPU functions when compiling using
  58       * MATH=68881
  59       */
  60 #    include <m68881.h>
  61 #  endif
  62 #endif
  63
  64 /* Codewarrior on NT has linking problems without this. */
  65 #if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
  66 #  define PNG_ALWAYS_EXTERN
  67 #endif
  68
  69 /* This provides the non-ANSI (far) memory allocation routines. */
  70 #if defined(__TURBOC__) && defined(__MSDOS__)
  71 #  include <mem.h>
  72 #  include <alloc.h>
  73 #endif
  74
  75 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
  76     defined(_WIN32) || defined(__WIN32__)
  77 #  include <windows.h>  /* defines _WINDOWS_ macro */
  78 /* I have no idea why is this necessary... */
  79 #  ifdef _MSC_VER
  80 #    include <malloc.h>
  81 #  endif
  82 #endif
  83
  84 /* Various modes of operation.  Note that after an init, mode is set to
  85  * zero automatically when the structure is created.
  86  */
  87 #define PNG_HAVE_IHDR               0x01
  88 #define PNG_HAVE_PLTE               0x02
  89 #define PNG_HAVE_IDAT               0x04
  90 #define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
  91 #define PNG_HAVE_IEND               0x10
  92 #define PNG_HAVE_gAMA               0x20
  93 #define PNG_HAVE_cHRM               0x40
  94 #define PNG_HAVE_sRGB               0x80
  95 #define PNG_HAVE_CHUNK_HEADER      0x100
  96 #define PNG_WROTE_tIME             0x200
  97 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
  98 #define PNG_BACKGROUND_IS_GRAY     0x800
  99 #define PNG_HAVE_PNG_SIGNATURE    0x1000
 100 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
 101
 102 /* Flags for the transformations the PNG library does on the image data */
 103 #define PNG_BGR                 0x0001
 104 #define PNG_INTERLACE           0x0002
 105 #define PNG_PACK                0x0004
 106 #define PNG_SHIFT               0x0008
 107 #define PNG_SWAP_BYTES          0x0010
 108 #define PNG_INVERT_MONO         0x0020
 109 #define PNG_QUANTIZE            0x0040 /* formerly PNG_DITHER */
 110 #define PNG_BACKGROUND          0x0080
 111 #define PNG_BACKGROUND_EXPAND   0x0100
 112                           /*    0x0200 unused */
 113 #define PNG_16_TO_8             0x0400
 114 #define PNG_RGBA                0x0800
 115 #define PNG_EXPAND              0x1000
 116 #define PNG_GAMMA               0x2000
 117 #define PNG_GRAY_TO_RGB         0x4000
 118 #define PNG_FILLER              0x8000L
 119 #define PNG_PACKSWAP           0x10000L
 120 #define PNG_SWAP_ALPHA         0x20000L
 121 #define PNG_STRIP_ALPHA        0x40000L
 122 #define PNG_INVERT_ALPHA       0x80000L
 123 #define PNG_USER_TRANSFORM    0x100000L
 124 #define PNG_RGB_TO_GRAY_ERR   0x200000L
 125 #define PNG_RGB_TO_GRAY_WARN  0x400000L
 126 #define PNG_RGB_TO_GRAY       0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
 127                        /*     0x800000L     Unused */
 128 #define PNG_ADD_ALPHA         0x1000000L  /* Added to libpng-1.2.7 */
 129 #define PNG_EXPAND_tRNS       0x2000000L  /* Added to libpng-1.2.9 */
 130                        /*   0x4000000L  unused */
 131                        /*   0x8000000L  unused */
 132                        /*  0x10000000L  unused */
 133                        /*  0x20000000L  unused */
 134                        /*  0x40000000L  unused */
 135
 136 /* Flags for png_create_struct */
 137 #define PNG_STRUCT_PNG   0x0001
 138 #define PNG_STRUCT_INFO  0x0002
 139
 140 /* Scaling factor for filter heuristic weighting calculations */
 141 #define PNG_WEIGHT_SHIFT 8
 142 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
 143 #define PNG_COST_SHIFT 3
 144 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
 145
 146 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
 147 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
 148 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
 149 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
 150 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
 151 #define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
 152 #define PNG_FLAG_ZLIB_FINISHED            0x0020
 153 #define PNG_FLAG_ROW_INIT                 0x0040
 154 #define PNG_FLAG_FILLER_AFTER             0x0080
 155 #define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
 156 #define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
 157 #define PNG_FLAG_CRC_CRITICAL_USE         0x0400
 158 #define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
 159                                 /*        0x1000  unused */
 160                                 /*        0x2000  unused */
 161                                 /*        0x4000  unused */
 162 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
 163 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
 164 #define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
 165 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
 166 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
 167 #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
 168 #define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
 169 #define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
 170 #define PNG_FLAG_BENIGN_ERRORS_WARN       0x800000L  /* Added to libpng-1.4.0 */
 171                                   /*     0x1000000L  unused */
 172                                   /*     0x2000000L  unused */
 173                                   /*     0x4000000L  unused */
 174                                   /*     0x8000000L  unused */
 175                                   /*    0x10000000L  unused */
 176                                   /*    0x20000000L  unused */
 177                                   /*    0x40000000L  unused */
 178
 179 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
 180                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
 181
 182 #define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
 183                                      PNG_FLAG_CRC_CRITICAL_IGNORE)
 184
 185 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
 186                                      PNG_FLAG_CRC_CRITICAL_MASK)
 187
 188 /* Save typing and make code easier to understand */
 189
 190 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
 191    abs((int)((c1).green) - (int)((c2).green)) + \
 192    abs((int)((c1).blue) - (int)((c2).blue)))
 193
 194 /* Added to libpng-1.2.6 JB */
 195 #define PNG_ROWBYTES(pixel_bits, width) \
 196     ((pixel_bits) >= 8 ? \
 197     ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
 198     (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
 199
 200 /* PNG_OUT_OF_RANGE returns true if value is outside the range
 201  * ideal-delta..ideal+delta.  Each argument is evaluated twice.
 202  * "ideal" and "delta" should be constants, normally simple
 203  * integers, "value" a variable. Added to libpng-1.2.6 JB
 204  */
 205 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
 206         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
 207
 208 /* Constant strings for known chunk types.  If you need to add a chunk,
 209  * define the name here, and add an invocation of the macro wherever it's
 210  * needed.
 211  */
 212 #define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
 213 #define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
 214 #define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
 215 #define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
 216 #define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
 217 #define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
 218 #define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
 219 #define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
 220 #define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
 221 #define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
 222 #define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
 223 #define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
 224 #define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
 225 #define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
 226 #define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
 227 #define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
 228 #define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
 229 #define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115,  84,  69,  82, '\0'}
 230 #define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
 231 #define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
 232 #define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
 233 #define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
 234
 235
 236 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
 237 #ifdef __cplusplus
 238 extern "C" {
 239 #endif /* __cplusplus */
 240
 241 /* These functions are used internally in the code.  They generally
 242  * shouldn't be used unless you are writing code to add or replace some
 243  * functionality in libpng.  More information about most functions can
 244  * be found in the files where the functions are located.
 245  */
 246
 247 /* Allocate memory for an internal libpng struct */
 248 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
 249
 250 /* Free memory from internal libpng struct */
 251 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
 252
 253 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
 254   malloc_fn, png_voidp mem_ptr));
 255 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
 256    png_free_ptr free_fn, png_voidp mem_ptr));
 257
 258 /* Free any memory that info_ptr points to and reset struct. */
 259 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
 260    png_infop info_ptr));
 261
 262 /* Function to allocate memory for zlib.  PNGAPI is disallowed. */
 263 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
 264
 265 /* Function to free memory for zlib.  PNGAPI is disallowed. */
 266 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
 267
 268 /* Next four functions are used internally as callbacks.  PNGAPI is required
 269  * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
 270
 271 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
 272    png_bytep data, png_size_t length));
 273
 274 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 275 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
 276    png_bytep buffer, png_size_t length));
 277 #endif
 278
 279 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
 280    png_bytep data, png_size_t length));
 281
 282 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 283 #ifdef PNG_STDIO_SUPPORTED
 284 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
 285 #endif
 286 #endif
 287
 288 /* Reset the CRC variable */
 289 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
 290
 291 /* Write the "data" buffer to whatever output you are using */
 292 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
 293    png_size_t length));
 294
 295 /* Read the chunk header (length + type name) */
 296 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
 297
 298 /* Read data from whatever input you are using into the "data" buffer */
 299 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
 300    png_size_t length));
 301
 302 /* Read bytes into buf, and update png_ptr->crc */
 303 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
 304    png_size_t length));
 305
 306 /* Decompress data in a chunk that uses compression */
 307 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
 308     defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
 309 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
 310    int comp_type, png_size_t chunklength, png_size_t prefix_length,
 311    png_size_t *data_length));
 312 #endif
 313
 314 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
 315 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
 316
 317 /* Read the CRC from the file and compare it to the libpng calculated CRC */
 318 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
 319
 320 /* Calculate the CRC over a section of data.  Note that we are only
 321  * passing a maximum of 64K on systems that have this as a memory limit,
 322  * since this is the maximum buffer size we can specify.
 323  */
 324 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
 325    png_size_t length));
 326
 327 #ifdef PNG_WRITE_FLUSH_SUPPORTED
 328 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
 329 #endif
 330
 331 /* Write various chunks */
 332
 333 /* Write the IHDR chunk, and update the png_struct with the necessary
 334  * information.
 335  */
 336 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
 337    png_uint_32 height,
 338    int bit_depth, int color_type, int compression_method, int filter_method,
 339    int interlace_method));
 340
 341 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
 342    png_uint_32 num_pal));
 343
 344 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
 345    png_size_t length));
 346
 347 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
 348
 349 #ifdef PNG_WRITE_gAMA_SUPPORTED
 350 #ifdef PNG_FLOATING_POINT_SUPPORTED
 351 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
 352 #endif
 353 #ifdef PNG_FIXED_POINT_SUPPORTED
 354 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
 355     png_fixed_point file_gamma));
 356 #endif
 357 #endif
 358
 359 #ifdef PNG_WRITE_sBIT_SUPPORTED
 360 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
 361    int color_type));
 362 #endif
 363
 364 #ifdef PNG_WRITE_cHRM_SUPPORTED
 365 #ifdef PNG_FLOATING_POINT_SUPPORTED
 366 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
 367    double white_x, double white_y,
 368    double red_x, double red_y, double green_x, double green_y,
 369    double blue_x, double blue_y));
 370 #endif
 371 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
 372    png_fixed_point int_white_x, png_fixed_point int_white_y,
 373    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
 374    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
 375    png_fixed_point int_blue_y));
 376 #endif
 377
 378 #ifdef PNG_WRITE_sRGB_SUPPORTED
 379 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
 380    int intent));
 381 #endif
 382
 383 #ifdef PNG_WRITE_iCCP_SUPPORTED
 384 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
 385    png_charp name, int compression_type,
 386    png_charp profile, int proflen));
 387    /* Note to maintainer: profile should be png_bytep */
 388 #endif
 389
 390 #ifdef PNG_WRITE_sPLT_SUPPORTED
 391 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
 392    png_sPLT_tp palette));
 393 #endif
 394
 395 #ifdef PNG_WRITE_tRNS_SUPPORTED
 396 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
 397    png_color_16p values, int number, int color_type));
 398 #endif
 399
 400 #ifdef PNG_WRITE_bKGD_SUPPORTED
 401 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
 402    png_color_16p values, int color_type));
 403 #endif
 404
 405 #ifdef PNG_WRITE_hIST_SUPPORTED
 406 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
 407    int num_hist));
 408 #endif
 409
 410 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
 411     defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
 412 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
 413    png_charp key, png_charpp new_key));
 414 #endif
 415
 416 #ifdef PNG_WRITE_tEXt_SUPPORTED
 417 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
 418    png_charp text, png_size_t text_len));
 419 #endif
 420
 421 #ifdef PNG_WRITE_zTXt_SUPPORTED
 422 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
 423    png_charp text, png_size_t text_len, int compression));
 424 #endif
 425
 426 #ifdef PNG_WRITE_iTXt_SUPPORTED
 427 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
 428    int compression, png_charp key, png_charp lang, png_charp lang_key,
 429    png_charp text));
 430 #endif
 431
 432 #ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */
 433 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
 434    png_infop info_ptr, png_textp text_ptr, int num_text));
 435 #endif
 436
 437 #ifdef PNG_WRITE_oFFs_SUPPORTED
 438 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
 439    png_int_32 x_offset, png_int_32 y_offset, int unit_type));
 440 #endif
 441
 442 #ifdef PNG_WRITE_pCAL_SUPPORTED
 443 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
 444    png_int_32 X0, png_int_32 X1, int type, int nparams,
 445    png_charp units, png_charpp params));
 446 #endif
 447
 448 #ifdef PNG_WRITE_pHYs_SUPPORTED
 449 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
 450    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
 451    int unit_type));
 452 #endif
 453
 454 #ifdef PNG_WRITE_tIME_SUPPORTED
 455 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
 456    png_timep mod_time));
 457 #endif
 458
 459 #ifdef PNG_WRITE_sCAL_SUPPORTED
 460 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
 461 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
 462    int unit, double width, double height));
 463 #else
 464 #ifdef PNG_FIXED_POINT_SUPPORTED
 465 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
 466    int unit, png_charp width, png_charp height));
 467 #endif
 468 #endif
 469 #endif
 470
 471 /* Called when finished processing a row of data */
 472 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
 473
 474 /* Internal use only.   Called before first row of data */
 475 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
 476
 477 #ifdef PNG_READ_GAMMA_SUPPORTED
 478 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
 479    png_byte bit_depth));
 480 #endif
 481
 482 /* Combine a row of data, dealing with alpha, etc. if requested */
 483 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
 484    int mask));
 485
 486 #ifdef PNG_READ_INTERLACING_SUPPORTED
 487 /* Expand an interlaced row */
 488 /* OLD pre-1.0.9 interface:
 489 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
 490    png_bytep row, int pass, png_uint_32 transformations));
 491  */
 492 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
 493 #endif
 494
 495 /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
 496
 497 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
 498 /* Grab pixels out of a row for an interlaced pass */
 499 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
 500    png_bytep row, int pass));
 501 #endif
 502
 503 /* Unfilter a row */
 504 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
 505    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
 506
 507 /* Choose the best filter to use and filter the row data */
 508 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
 509    png_row_infop row_info));
 510
 511 /* Write out the filtered row. */
 512 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
 513    png_bytep filtered_row));
 514 /* Finish a row while reading, dealing with interlacing passes, etc. */
 515 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
 516
 517 /* Initialize the row buffers, etc. */
 518 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
 519 /* Optional call to update the users info structure */
 520 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
 521    png_infop info_ptr));
 522
 523 /* These are the functions that do the transformations */
 524 #ifdef PNG_READ_FILLER_SUPPORTED
 525 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
 526    png_bytep row, png_uint_32 filler, png_uint_32 flags));
 527 #endif
 528
 529 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
 530 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
 531    png_bytep row));
 532 #endif
 533
 534 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
 535 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
 536    png_bytep row));
 537 #endif
 538
 539 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
 540 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
 541    png_bytep row));
 542 #endif
 543
 544 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
 545 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
 546    png_bytep row));
 547 #endif
 548
 549 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
 550     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
 551 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
 552    png_bytep row, png_uint_32 flags));
 553 #endif
 554
 555 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 556 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
 557 #endif
 558
 559 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
 560     defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 561 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
 562 #endif
 563
 564 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 565 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
 566    row_info, png_bytep row));
 567 #endif
 568
 569 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
 570 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
 571    png_bytep row));
 572 #endif
 573
 574 #ifdef PNG_READ_PACK_SUPPORTED
 575 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
 576 #endif
 577
 578 #ifdef PNG_READ_SHIFT_SUPPORTED
 579 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
 580    png_color_8p sig_bits));
 581 #endif
 582
 583 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 584 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
 585 #endif
 586
 587 #ifdef PNG_READ_16_TO_8_SUPPORTED
 588 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
 589 #endif
 590
 591 #ifdef PNG_READ_QUANTIZE_SUPPORTED
 592 PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
 593    png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
 594
 595 #  ifdef PNG_CORRECT_PALETTE_SUPPORTED
 596 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
 597    png_colorp palette, int num_palette));
 598 #  endif
 599 #endif
 600
 601 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 602 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
 603 #endif
 604
 605 #ifdef PNG_WRITE_PACK_SUPPORTED
 606 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
 607    png_bytep row, png_uint_32 bit_depth));
 608 #endif
 609
 610 #ifdef PNG_WRITE_SHIFT_SUPPORTED
 611 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
 612    png_color_8p bit_depth));
 613 #endif
 614
 615 #ifdef PNG_READ_BACKGROUND_SUPPORTED
 616 #ifdef PNG_READ_GAMMA_SUPPORTED
 617 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
 618    png_color_16p trans_color, png_color_16p background,
 619    png_color_16p background_1,
 620    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
 621    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
 622    png_uint_16pp gamma_16_to_1, int gamma_shift));
 623 #else
 624 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
 625    png_color_16p trans_color, png_color_16p background));
 626 #endif
 627 #endif
 628
 629 #ifdef PNG_READ_GAMMA_SUPPORTED
 630 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
 631    png_bytep gamma_table, png_uint_16pp gamma_16_table,
 632    int gamma_shift));
 633 #endif
 634
 635 #ifdef PNG_READ_EXPAND_SUPPORTED
 636 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
 637    png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
 638 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
 639    png_bytep row, png_color_16p trans_value));
 640 #endif
 641
 642 /* The following decodes the appropriate chunks, and does error correction,
 643  * then calls the appropriate callback for the chunk if it is valid.
 644  */
 645
 646 /* Decode the IHDR chunk */
 647 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
 648    png_uint_32 length));
 649 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
 650    png_uint_32 length));
 651 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
 652    png_uint_32 length));
 653
 654 #ifdef PNG_READ_bKGD_SUPPORTED
 655 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
 656    png_uint_32 length));
 657 #endif
 658
 659 #ifdef PNG_READ_cHRM_SUPPORTED
 660 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
 661    png_uint_32 length));
 662 #endif
 663
 664 #ifdef PNG_READ_gAMA_SUPPORTED
 665 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
 666    png_uint_32 length));
 667 #endif
 668
 669 #ifdef PNG_READ_hIST_SUPPORTED
 670 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
 671    png_uint_32 length));
 672 #endif
 673
 674 #ifdef PNG_READ_iCCP_SUPPORTED
 675 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
 676    png_uint_32 length));
 677 #endif /* PNG_READ_iCCP_SUPPORTED */
 678
 679 #ifdef PNG_READ_iTXt_SUPPORTED
 680 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 681    png_uint_32 length));
 682 #endif
 683
 684 #ifdef PNG_READ_oFFs_SUPPORTED
 685 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
 686    png_uint_32 length));
 687 #endif
 688
 689 #ifdef PNG_READ_pCAL_SUPPORTED
 690 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
 691    png_uint_32 length));
 692 #endif
 693
 694 #ifdef PNG_READ_pHYs_SUPPORTED
 695 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
 696    png_uint_32 length));
 697 #endif
 698
 699 #ifdef PNG_READ_sBIT_SUPPORTED
 700 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
 701    png_uint_32 length));
 702 #endif
 703
 704 #ifdef PNG_READ_sCAL_SUPPORTED
 705 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
 706    png_uint_32 length));
 707 #endif
 708
 709 #ifdef PNG_READ_sPLT_SUPPORTED
 710 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
 711    png_uint_32 length));
 712 #endif /* PNG_READ_sPLT_SUPPORTED */
 713
 714 #ifdef PNG_READ_sRGB_SUPPORTED
 715 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
 716    png_uint_32 length));
 717 #endif
 718
 719 #ifdef PNG_READ_tEXt_SUPPORTED
 720 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 721    png_uint_32 length));
 722 #endif
 723
 724 #ifdef PNG_READ_tIME_SUPPORTED
 725 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
 726    png_uint_32 length));
 727 #endif
 728
 729 #ifdef PNG_READ_tRNS_SUPPORTED
 730 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
 731    png_uint_32 length));
 732 #endif
 733
 734 #ifdef PNG_READ_zTXt_SUPPORTED
 735 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
 736    png_uint_32 length));
 737 #endif
 738
 739 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
 740    png_infop info_ptr, png_uint_32 length));
 741
 742 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
 743    png_bytep chunk_name));
 744
 745 /* Handle the transformations for reading and writing */
 746 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
 747 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
 748
 749 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
 750
 751 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 752 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
 753    png_infop info_ptr));
 754 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
 755    png_infop info_ptr));
 756 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
 757 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
 758    png_uint_32 length));
 759 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
 760 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
 761 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
 762    png_bytep buffer, png_size_t buffer_length));
 763 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
 764 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
 765    png_bytep buffer, png_size_t buffer_length));
 766 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
 767 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
 768    png_infop info_ptr, png_uint_32 length));
 769 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
 770    png_infop info_ptr));
 771 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
 772    png_infop info_ptr));
 773 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
 774 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
 775    png_infop info_ptr));
 776 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
 777    png_infop info_ptr));
 778 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
 779 #ifdef PNG_READ_tEXt_SUPPORTED
 780 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
 781    png_infop info_ptr, png_uint_32 length));
 782 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
 783    png_infop info_ptr));
 784 #endif
 785 #ifdef PNG_READ_zTXt_SUPPORTED
 786 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
 787    png_infop info_ptr, png_uint_32 length));
 788 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
 789    png_infop info_ptr));
 790 #endif
 791 #ifdef PNG_READ_iTXt_SUPPORTED
 792 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
 793    png_infop info_ptr, png_uint_32 length));
 794 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
 795    png_infop info_ptr));
 796 #endif
 797
 798 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 799
 800 #ifdef PNG_MNG_FEATURES_SUPPORTED
 801 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
 802    png_bytep row));
 803 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
 804    png_bytep row));
 805 #endif
 806
 807 /* Added at libpng version 1.4.0 */
 808 #ifdef PNG_cHRM_SUPPORTED
 809 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
 810    png_fixed_point int_white_x, png_fixed_point int_white_y,
 811    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
 812    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
 813    png_fixed_point int_blue_y));
 814 #endif
 815
 816 #ifdef PNG_cHRM_SUPPORTED
 817 #ifdef PNG_CHECK_cHRM_SUPPORTED
 818 /* Added at libpng version 1.2.34 and 1.4.0 */
 819 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
 820    unsigned long *hi_product, unsigned long *lo_product));
 821 #endif
 822 #endif
 823
 824 /* Added at libpng version 1.4.0 */
 825 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
 826    png_uint_32 width, png_uint_32 height, int bit_depth,
 827    int color_type, int interlace_type, int compression_type,
 828    int filter_type));
 829
 830 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */
 831 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
 832    png_infop end_info_ptr));
 833
 834 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
 835 extern void png_write_destroy PNGARG((png_structp png_ptr));
 836
 837 #ifdef USE_FAR_KEYWORD  /* memory model conversion function */
 838 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
 839    int check));
 840 #endif /* USE_FAR_KEYWORD */
 841
 842 /* Define PNG_DEBUG at compile time for debugging information.  Higher
 843  * numbers for PNG_DEBUG mean more debugging information.  This has
 844  * only been added since version 0.95 so it is not implemented throughout
 845  * libpng yet, but more support will be added as needed.
 846  */
 847 #ifdef PNG_DEBUG
 848 #if (PNG_DEBUG > 0)
 849 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
 850 #include <crtdbg.h>
 851 #if (PNG_DEBUG > 1)
 852 #ifndef _DEBUG
 853 #  define _DEBUG
 854 #endif
 855 #ifndef png_debug
 856 #define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
 857 #endif
 858 #ifndef png_debug1
 859 #define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
 860 #endif
 861 #ifndef png_debug2
 862 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
 863 #endif
 864 #endif
 865 #else /* PNG_DEBUG_FILE || !_MSC_VER */
 866 #ifndef PNG_DEBUG_FILE
 867 #define PNG_DEBUG_FILE stderr
 868 #endif /* PNG_DEBUG_FILE */
 869
 870 #if (PNG_DEBUG > 1)
 871 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
 872  * non-ISO compilers
 873  */
 874 #  ifdef __STDC__
 875 #    ifndef png_debug
 876 #      define png_debug(l,m) \
 877        { \
 878        int num_tabs=l; \
 879        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 880          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
 881        }
 882 #    endif
 883 #    ifndef png_debug1
 884 #      define png_debug1(l,m,p1) \
 885        { \
 886        int num_tabs=l; \
 887        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 888          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
 889        }
 890 #    endif
 891 #    ifndef png_debug2
 892 #      define png_debug2(l,m,p1,p2) \
 893        { \
 894        int num_tabs=l; \
 895        fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
 896          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
 897        }
 898 #    endif
 899 #  else /* __STDC __ */
 900 #    ifndef png_debug
 901 #      define png_debug(l,m) \
 902        { \
 903        int num_tabs=l; \
 904        char format[256]; \
 905        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 906          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 907          m,PNG_STRING_NEWLINE); \
 908        fprintf(PNG_DEBUG_FILE,format); \
 909        }
 910 #    endif
 911 #    ifndef png_debug1
 912 #      define png_debug1(l,m,p1) \
 913        { \
 914        int num_tabs=l; \
 915        char format[256]; \
 916        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 917          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 918          m,PNG_STRING_NEWLINE); \
 919        fprintf(PNG_DEBUG_FILE,format,p1); \
 920        }
 921 #    endif
 922 #    ifndef png_debug2
 923 #      define png_debug2(l,m,p1,p2) \
 924        { \
 925        int num_tabs=l; \
 926        char format[256]; \
 927        snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
 928          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
 929          m,PNG_STRING_NEWLINE); \
 930        fprintf(PNG_DEBUG_FILE,format,p1,p2); \
 931        }
 932 #    endif
 933 #  endif /* __STDC __ */
 934 #endif /* (PNG_DEBUG > 1) */
 935
 936 #endif /* _MSC_VER */
 937 #endif /* (PNG_DEBUG > 0) */
 938 #endif /* PNG_DEBUG */
 939 #ifndef png_debug
 940 #define png_debug(l, m)
 941 #endif
 942 #ifndef png_debug1
 943 #define png_debug1(l, m, p1)
 944 #endif
 945 #ifndef png_debug2
 946 #define png_debug2(l, m, p1, p2)
 947 #endif
 948
 949 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
 950
 951 #ifdef __cplusplus
 952 }
 953 #endif
 954
 955 #endif /* PNG_VERSION_INFO_ONLY */
 956 #endif /* PNGPRIV_H */