#if 0

CHANGES - changes for libpng

version 0.1 [March 29, 1995]

  initial beta release

version 0.2 [April 1, 1995]

  added reader into png.h

  fixed small problems in stub file

version 0.3 [April 8, 1995]

  added pull reader

  split up pngwrite.c to several files

  added pnglib.txt

  added example.c

  cleaned up writer, adding a few new transformations

  fixed some bugs in writer

  interfaced with zlib 0.5

  added K&R support

  added check for 64 KB blocks for 16 bit machines

version 0.4 [April 26, 1995]

  cleaned up code and commented code

  simplified time handling into png_time

  created png_color_16 and png_color_8 to handle color needs

  cleaned up color type defines

  fixed various bugs

  made various names more consistent

  interfaced with zlib 0.71

  cleaned up zTXt reader and writer (using zlib's Reset functions)

  split transformations into pngrtran.c and pngwtran.c

version 0.5 [April 30, 1995]

  interfaced with zlib 0.8

  fixed many reading and writing bugs

  saved using 3 spaces instead of tabs

version 0.6 [May 1, 1995]

  first beta release

  added png_large_malloc() and png_large_free()

  added png_size_t

  cleaned up some compiler warnings

  added png_start_read_image()

version 0.7 [June 24, 1995]

  cleaned up lots of bugs

  finished dithering and other stuff

  added test program

  changed name from pnglib to libpng

version 0.71 [June 26, 1995]

  changed pngtest.png for zlib 0.93

  fixed error in libpng.txt and example.c

version 0.8 [August 20, 1995]

  cleaned up some bugs

  added png_set_filler()

  split up pngstub.c into pngmem.c, pngio.c, and pngerror.c

  added #define's to remove unwanted code

  moved png_info_init() to png.c

  added old_size into png_realloc()

  added functions to manually set filtering and compression info

  changed compression parameters based on image type

  optimized filter selection code

  added version info

  changed external functions passing floats to doubles (k&r problems?)

  put all the configurable stuff in pngconf.h

  enabled png_set_shift to work with paletted images on read

  added png_read_update_info() - updates info structure with

     transformations

version 0.81 [August, 1995]

  incorporated Tim Wegner's medium model code (thanks, Tim)

version 0.82 [September, 1995]

  [unspecified changes]

version 0.85 [December, 1995]

  added more medium model code (almost everything's a far)

  added i/o, error, and memory callback functions

  fixed some bugs (16 bit, 4 bit interlaced, etc.)

  added first run progressive reader (barely tested)

version 0.86 [January, 1996]

  fixed bugs

  improved documentation

version 0.87 [January, 1996]

  fixed medium model bugs

  fixed other bugs introduced in 0.85 and 0.86

  added some minor documentation

version 0.88 [January, 1996]

  fixed progressive bugs

  replaced tabs with spaces

  cleaned up documentation

  added callbacks for read/write and warning/error functions

version 0.89 [July, 1996]

  added new initialization API to make libpng work better with shared libs

     we now have png_create_read_struct(), png_create_write_struct(),

     png_create_info_struct(), png_destroy_read_struct(), and

     png_destroy_write_struct() instead of the separate calls to

     malloc and png_read_init(), png_info_init(), and png_write_init()

  changed warning/error callback functions to fix bug - this means you

     should use the new initialization API if you were using the old

     png_set_message_fn() calls, and that the old API no longer exists

     so that people are aware that they need to change their code

  changed filter selection API to allow selection of multiple filters

     since it didn't work in previous versions of libpng anyways

  optimized filter selection code

  fixed png_set_background() to allow using an arbitrary RGB color for

     paletted images

  fixed gamma and background correction for paletted images, so

     png_correct_palette is not needed unless you are correcting an

     external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED

     in pngconf.h) - if nobody uses this, it may disappear in the future.

  fixed bug with Borland 64K memory allocation (Alexander Lehmann)

  fixed bug in interlace handling (Smarasderagd, I think)

  added more error checking for writing and image to reduce invalid files

  separated read and write functions so that they won't both be linked

     into a binary when only reading or writing functionality is used

  new pngtest image also has interlacing and zTXt

  updated documentation to reflect new API

version 0.90 [January, 1997]

  made CRC errors/warnings on critical and ancillary chunks configurable

  libpng will use the zlib CRC routines by (compile-time) default

  changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)

  added external C++ wrapper statements to png.h (Gilles Dauphin)

  allow PNG file to be read when some or all of file signature has already

     been read from the beginning of the stream.  ****This affects the size

     of info_struct and invalidates all programs that use a shared libpng****

  fixed png_filler() declarations

  fixed? background color conversions

  fixed order of error function pointers to match documentation

  current chunk name is now available in png_struct to reduce the number

     of nearly identical error messages (will simplify multi-lingual

     support when available)

  try to get ready for unknown-chunk callback functions:

     - previously read critical chunks are flagged, so the chunk handling

       routines can determine if the chunk is in the right place

     - all chunk handling routines have the same prototypes, so we will

       be able to handle all chunks via a callback mechanism

  try to fix Linux "setjmp" buffer size problems

  removed png_large_malloc, png_large_free, and png_realloc functions.

version 0.95 [March, 1997]

  fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never

  fixed bug in PNG file signature compares when start != 0

  changed parameter type of png_set_filler(...filler...) from png_byte

     to png_uint_32

  added test for MACOS to ensure that both math.h and fp.h are not #included

  added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)

  added "packswap" transformation, which changes the endianness of

     packed-pixel bytes (Kevin Bracey)

  added "strip_alpha" transformation, which removes the alpha channel of

     input images without using it (not necessarily a good idea)

  added "swap_alpha" transformation, which puts the alpha channel in front

     of the color bytes instead of after

  removed all implicit variable tests which assume NULL == 0 (I think)

  changed several variables to "png_size_t" to show 16/32-bit limitations

  added new pCAL chunk read/write support

  added experimental filter selection weighting (Greg Roelofs)

  removed old png_set_rgbx() and png_set_xrgb() functions that have been

     obsolete for about 2 years now (use png_set_filler() instead)

  added macros to read 16- and 32-bit ints directly from buffer, to be

     used only on those systems that support it (namely PowerPC and 680x0)

     With some testing, this may become the default for MACOS/PPC systems.

  only calculate CRC on data if we are going to use it

  added macros for zTXt compression type PNG_zTXt_COMPRESSION_???

  added macros for simple libpng debugging output selectable at compile time

  removed PNG_READ_END_MODE in progressive reader (Smarasderagd)

  more description of info_struct in libpng.txt and png.h

  more instructions in example.c

  more chunk types tested in pngtest.c

  renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be

     png_set_<chunk>.  We now have corresponding png_get_<chunk>

     functions in pngget.c to get information in info_ptr.  This isolates

     the application from the internal organization of png_info_struct

     (good for shared library implementations).

version 0.96 [May, 1997]

  fixed serious bug with < 8bpp images introduced in 0.95

  fixed 256-color transparency bug (Greg Roelofs)

  fixed up documentation (Greg Roelofs, Laszlo Nyul)

  fixed "error" in pngconf.h for Linux setjmp() behaviour

  fixed DOS medium model support (Tim Wegner)

  fixed png_check_keyword() for case with error in static string text

  added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)

  added typecasts to quiet compiler errors

  added more debugging info

version 0.97 [January, 1998]

  removed PNG_USE_OWN_CRC capability

  relocated png_set_crc_action from pngrutil.c to pngrtran.c

  fixed typecasts of "new_key", etc. (Andreas Dilger)

  added RFC 1152 [sic] date support

  fixed bug in gamma handling of 4-bit grayscale

  added 2-bit grayscale gamma handling (Glenn R-P)

  added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)

  minor corrections in libpng.txt

  added simple sRGB support (Glenn R-P)

  easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;

     all configurable options can be selected from command-line instead

     of having to edit pngconf.h (Glenn R-P)

  fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)

  added more conditions for png_do_background, to avoid changing

     black pixels to background when a background is supplied and

     no pixels are transparent

  repaired PNG_NO_STDIO behaviour

  tested NODIV support and made it default behaviour (Greg Roelofs)

  added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)

  regularized version numbering scheme and bumped shared-library major

     version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)

version 0.98 [January, 1998]

  cleaned up some typos in libpng.txt and in code documentation

  fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)

  cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c

  changed recommendation about file_gamma for PC images to .51 from .45,

     in example.c and libpng.txt, added comments to distinguish between

     screen_gamma, viewing_gamma, and display_gamma.

  changed all references to RFC1152 to read RFC1123 and changed the

     PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED

  added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)

  changed srgb_intent from png_byte to int to avoid compiler bugs

version 0.99 [January 30, 1998]

  free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)

  fixed a longstanding "packswap" bug in pngtrans.c

  fixed some inconsistencies in pngconf.h that prevented compiling with

     PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined

  fixed some typos and made other minor rearrangement of libpng.txt (Andreas)

  changed recommendation about file_gamma for PC images to .50 from .51 in

     example.c and libpng.txt, and changed file_gamma for sRGB images to .45

  added a number of functions to access information from the png structure

     png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)

  added TARGET_MACOS similar to zlib-1.0.8

  define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined

  added type casting to all png_malloc() function calls

version 0.99a [January 31, 1998]

  Added type casts and parentheses to all returns that return a value.(Tim W.)

version 0.99b [February 4, 1998]

  Added type cast png_uint_32 on malloc function calls where needed.

  Changed type of num_hist from png_uint_32 to int (same as num_palette).

  Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.

  Renamed makefile.elf to makefile.lnx.

version 0.99c [February 7, 1998]

  More type casting.  Removed erroneous overflow test in pngmem.c.

  Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.

  Added UNIX manual pages libpng.3 (incorporating libpng.txt) and  png.5.

version 0.99d [February 11, 1998]

  Renamed "far_to_near()" "png_far_to_near()"

  Revised libpng.3

  Version 99c "buffered" operations didn't work as intended.  Replaced them

    with png_memcpy_check() and png_memset_check().

  Added many "if (png_ptr == NULL) return" to quell compiler warnings about

    unused png_ptr, mostly in pngget.c and pngset.c.

  Check for overlength tRNS chunk present when indexed-color PLTE is read.

  Cleaned up spelling errors in libpng.3/libpng.txt

  Corrected a problem with png_get_tRNS() which returned undefined trans array

version 0.99e [February 28, 1998]

  Corrected png_get_tRNS() again.

  Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".

  Touched up example.c to make more of it compileable, although the entire

    file still can't be compiled (Willem van Schaik)

  Fixed a bug in png_do_shift() (Bryan Tsai)

  Added a space in png.h prototype for png_write_chunk_start()

  Replaced pngtest.png with one created with zlib 1.1.1

  Changed pngtest to report PASS even when file size is different (Jean-loup G.)

  Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)

version 0.99f [March 5, 1998]

  Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)

  Moved makefiles into a "scripts" directory, and added INSTALL instruction file

  Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)

  Added pointers to "note on libpng versions" in makefile.lnx and README

  Added row callback feature when reading and writing nonprogressive rows

     and added a test of this feature in pngtest.c

  Added user transform callbacks, with test of the feature in pngtest.c

version 0.99g [March 6, 1998, morning]

  Minor changes to pngtest.c to suppress compiler warnings.

  Removed "beta" language from documentation.

version 0.99h [March 6, 1998, evening]

  Minor changes to previous minor changes to pngtest.c

  Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED

  and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro

  Added user transform capability

version 1.00 [March 7, 1998]

  Changed several typedefs in pngrutil.c

  Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)

  replaced "while(1)" with "for(;;)"

  added PNGARG() to prototypes in pngtest.c and removed some prototypes

  updated some of the makefiles (Tom Lane)

  changed some typedefs (s_start, etc.) in pngrutil.c

  fixed dimensions of "short_months" array in pngwrite.c

  Replaced ansi2knr.c with the one from jpeg-v6

version 1.0.0 [March 8, 1998]

  Changed name from 1.00 to 1.0.0 (Adam Costello)

  Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)

version 1.0.0a [March 9, 1998]

  Fixed three bugs in pngrtran.c to make gamma+background handling consistent

  (Greg Roelofs)

  Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz

  for major, minor, and bugfix releases.  This is 10001. (Adam Costello,

  Tom Lane)

  Make months range from 1-12 in png_convert_to_rfc1123

version 1.0.0b [March 13, 1998]

  Quieted compiler complaints about two empty "for" loops in pngrutil.c

  Minor changes to makefile.s2x

  Removed #ifdef/#endif around a png_free() in pngread.c

version 1.0.1 [March 14, 1998]

  Changed makefile.s2x to reduce security risk of using a relative pathname

  Fixed some typos in the documentation (Greg).

  Fixed a problem with value of "channels" returned by png_read_update_info()

version 1.0.1a [April 21, 1998]

  Optimized Paeth calculations by replacing abs() function calls with intrinsics

  plus other loop optimizations. Improves avg decoding speed by about 20%.

  Commented out i386istic "align" compiler flags in makefile.lnx.

  Reduced the default warning level in some makefiles, to make them consistent.

  Removed references to IJG and JPEG in the ansi2knr.c copyright statement.

  Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.

  Added grayscale and 16-bit capability to png_do_read_filler().

  Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes

    too large when writing an image with bit_depth < 8 (Bob Dellaca).

  Corrected some bugs in the experimental weighted filtering heuristics.

  Moved a misplaced pngrutil code block that truncates tRNS if it has more

    than num_palette entries -- test was done before num_palette was defined.

  Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).

  Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).

version 1.0.1b [May 2, 1998]

  Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).

  Relocated the png_composite macros from pngrtran.c to png.h (Greg).

  Added makefile.sco (contributed by Mike Hopkirk).

  Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.

  Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.

  More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).

  More work on loop optimization which may help when compiled with C++ compilers.

  Added warnings when people try to use transforms they've defined out.

  Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.

  Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)

version 1.0.1c [May 11, 1998]

  Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for

    filler bytes should have been 0xff instead of 0xf.

  Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.

  Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED

    out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h

  Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,

    for consistency, in pngconf.h

  Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier

    to remove unwanted capabilities via the compile line

  Made some corrections to grammar (which, it's) in documentation (Greg).

  Corrected example.c, use of row_pointers in png_write_image().

version 1.0.1d [May 24, 1998]

  Corrected several statements that used side effects illegally in pngrutil.c

    and pngtrans.c, that were introduced in version 1.0.1b

  Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)

  More corrections to example.c, use of row_pointers in png_write_image()

    and png_read_rows().

  Added pngdll.mak and pngdef.pas to scripts directory, contributed by

    Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5

  Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)

  Changed several loops from count-down to count-up, for consistency.

version 1.0.1e [June 6, 1998]

  Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and

    added warnings when people try to set png_read_fn and png_write_fn in

    the same structure.

  Added a test such that png_do_gamma will be done when num_trans==0

    for truecolor images that have defined a background.  This corrects an

    error that was introduced in libpng-0.90 that can cause gamma processing

    to be skipped.

  Added tests in png.h to include "trans" and "trans_values" in structures

    when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.

  Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()

  Moved png_convert_to_rfc_1123() from pngwrite.c to png.c

  Added capability for user-provided malloc_fn() and free_fn() functions,

    and revised pngtest.c to demonstrate their use, replacing the

    PNGTEST_DEBUG_MEM feature.

  Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).

version 1.0.2 [June 14, 1998]

  Fixed two bugs in makefile.bor .

version 1.0.2a [December 30, 1998]

  Replaced and extended code that was removed from png_set_filler() in 1.0.1a.

  Fixed a bug in png_do_filler() that made it fail to write filler bytes in

    the left-most pixel of each row (Kevin Bracey).

  Changed "static pngcharp tIME_string" to "static char tIME_string[30]"

    in pngtest.c (Duncan Simpson).

  Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk

    even when no tIME chunk was present in the source file.

  Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.

  Fixed a problem in png_read_push_finish_row(), which would not skip some

    passes that it should skip, for images that are less than 3 pixels high.

  Interchanged the order of calls to png_do_swap() and png_do_shift()

    in pngwtran.c (John Cromer).

  Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .

  Changed "bad adaptive filter type" from error to warning in pngrutil.c .

  Fixed a documentation error about default filtering with 8-bit indexed-color.

  Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO

    (L. Peter Deutsch).

  Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.

  Added png_get_copyright() and png_get_header_version() functions.

  Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c

  Added information about debugging in libpng.txt and libpng.3 .

  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.

  Removed lines after Dynamic Dependencies" in makefile.aco .

  Revised makefile.dec to make a shared library (Jeremie Petit).

  Removed trailing blanks from all files.

version 1.0.2a [January 6, 1999]

  Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h

  Added "if" tests to silence complaints about unused png_ptr in png.h and png.c

  Changed "check_if_png" function in example.c to return true (nonzero) if PNG.

  Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()

    which is obsolete.

version 1.0.3 [January 14, 1999]

  Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)

  Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.

version 1.0.3a [August 12, 1999]

  Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning

     if an attempt is made to read an interlaced image when it's not supported.

  Added check if png_ptr->trans is defined before freeing it in pngread.c

  Modified the Y2K statement to include versions back to version 0.71

  Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c

  Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)

  Replaced leading blanks with tab characters in makefile.hux

  Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.

  Changed (float)red and (float)green to (double)red, (double)green

     in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.

  Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).

  Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).

  Updated documentation to refer to the PNG-1.2 specification.

  Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c

    in makefile.knr, INSTALL, and README (L. Peter Deutsch)

  Fixed bugs in calculation of the length of rowbytes when adding alpha

    channels to 16-bit images, in pngrtran.c (Chris Nokleberg)

  Added function png_set_user_transform_info() to store user_transform_ptr,

    user_depth, and user_channels into the png_struct, and a function

    png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)

  Added function png_set_empty_plte_permitted() to make libpng useable

    in MNG applications.

  Corrected the typedef for png_free_ptr in png.h (Jesse Jones).

  Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be

    consistent with PNG-1.2, and allow variance of 500 before complaining.

  Added assembler code contributed by Intel in file pngvcrd.c and modified

    makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)

  Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.

  Added some aliases for png_set_expand() in pngrtran.c, namely

    png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()

    (Greg Roelofs, in "PNG: The Definitive Guide").

  Added makefile.beo for BEOS on X86, contributed by Sander Stok.

version 1.0.3b [August 26, 1999]

  Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h

  Changed leading blanks to tabs in all makefiles.

  Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.

  Made alternate versions of  png_set_expand() in pngrtran.c, namely

    png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha

    (Greg Roelofs, in "PNG: The Definitive Guide").  Deleted the 1.0.3a aliases.

  Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h

  Revised calculation of num_blocks in pngmem.c to avoid a potentially

    negative shift distance, whose results are undefined in the C language.

  Added a check in pngset.c to prevent writing multiple tIME chunks.

  Added a check in pngwrite.c to detect invalid small window_bits sizes.

version 1.0.3d [September 4, 1999]

  Fixed type casting of igamma in pngrutil.c

  Added new png_expand functions to scripts/pngdef.pas and pngos2.def

  Added a demo read_user_transform_fn that examines the row filters in pngtest.c

Version 1.0.4 [September 24, 1999, not distributed publicly]

  Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined

  Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h

  Made several minor corrections to pngtest.c

  Renamed the makefiles with longer but more user friendly extensions.

  Copied the PNG copyright and license to a separate LICENSE file.

  Revised documentation, png.h, and example.c to remove reference to

    "viewing_gamma" which no longer appears in the PNG specification.

  Revised pngvcrd.c to use MMX code for interlacing only on the final pass.

  Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a

  Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX

    assembler code) and makefile.vcwin32 (doesn't).

  Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)

  Added a copy of pngnow.png to the distribution.

version 1.0.4a [September 25, 1999]

  Increase max_pixel_depth in pngrutil.c if a user transform needs it.

  Changed several division operations to right-shifts in pngvcrd.c

version 1.0.4b [September 30, 1999]

  Added parentheses in line 3732 of pngvcrd.c

  Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1

version 1.0.4c [October 1, 1999]

  Added a "png_check_version" function in png.c and pngtest.c that will generate

    a helpful compiler error if an old png.h is found in the search path.

  Changed type of png_user_transform_depth|channels from int to png_byte.

  Added "Libpng is OSI Certified Open Source Software" statement to png.h

version 1.0.4d [October 6, 1999]

  Changed 0.45 to 0.45455 in png_set_sRGB()

  Removed unused PLTE entries from pngnow.png

  Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.

version 1.0.4e [October 10, 1999]

  Fixed sign error in pngvcrd.c (Greg Roelofs)

  Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)

version 1.0.4f [October 15, 1999]

  Surrounded example.c code with #if 0 .. #endif to prevent people from

    inadvertently trying to compile it.

  Changed png_get_header_version() from a function to a macro in png.h

  Added type casting mostly in pngrtran.c and pngwtran.c

  Removed some pointless "ptr = NULL" in pngmem.c

  Added a "contrib" directory containing the source code from Greg's book.

version 1.0.5 [October 15, 1999]

  Minor editing of the INSTALL and README files.

version 1.0.5a [October 23, 1999]

  Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)

  Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)

  Further optimization and bugfix of pngvcrd.c

  Revised pngset.c so that it does not allocate or free memory in the user's

    text_ptr structure.  Instead, it makes its own copy.

  Created separate write_end_info_struct in pngtest.c for a more severe test.

  Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.

version 1.0.5b [November 23, 1999]

  Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and

    PNG_FLAG_WROTE_tIME from flags to mode.

  Added png_write_info_before_PLTE() function.

  Fixed some typecasting in contrib/gregbook/*.c

  Updated scripts/makevms.com and added makevms.com to contrib/gregbook

    and contrib/pngminus (Martin Zinser)

version 1.0.5c [November 26, 1999]

  Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.

  Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to

    accommodate making DLL's: Moved usr_png_ver from global variable to function

    png_get_header_ver() in png.c.  Moved png_sig to png_sig_bytes in png.c and

    eliminated use of png_sig in pngwutil.c.  Moved the various png_CHNK arrays

    into pngtypes.h.  Eliminated use of global png_pass arrays.  Declared the

    png_CHNK and png_pass arrays to be "const".  Made the global arrays

    available to applications (although none are used in libpng itself) when

    PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.

  Removed some extraneous "-I" from contrib/pngminus/makefile.std

  Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.

  Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3

version 1.0.5d [November 29, 1999]

  Add type cast (png_const_charp) two places in png.c

  Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.

  Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available

    to applications a macro "PNG_USE_LOCAL_ARRAYS".

  Remove all the new declarations with #ifdef/#endif when

    PNG_USE_GLOBAL_ARRAYS is defined.

  Added PNG_EXPORT_VAR macro to accommodate making DLL's.

version 1.0.5e [November 30, 1999]

  Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text

    structure; refactored the inflate/deflate support to make adding new chunks

    with trailing compressed parts easier in the future, and added new functions

    png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,

    png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).

  NOTE: Applications that write text chunks MUST define png_text->lang

    before calling png_set_text(). It must be set to NULL if you want to

    write tEXt or zTXt chunks.  If you want your application to be able to

    run with older versions of libpng, use

      #ifdef PNG_iTXt_SUPPORTED

         png_text[i].lang = NULL;

      #endif

  Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned

    offsets (Eric S. Raymond).

  Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into

    PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED

    macros, leaving the separate macros also available.

  Removed comments on #endifs at the end of many short, non-nested #if-blocks.

version 1.0.5f [December 6, 1999]

  Changed makefile.solaris to issue a warning about potential problems when

    the ucb "ld" is in the path ahead of the ccs "ld".

  Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.

  Added sCAL chunk support (Eric S. Raymond).

version 1.0.5g [December 7, 1999]

  Fixed "png_free_spallettes" typo in png.h

  Added code to handle new chunks in pngpread.c

  Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block

  Added "translated_key" to png_text structure and png_write_iTXt().

  Added code in pngwrite.c to work around a newly discovered zlib bug.

version 1.0.5h [December 10, 1999]

  NOTE: regarding the note for version 1.0.5e, the following must also

    be included in your code:

        png_text[i].translated_key = NULL;

  Unknown chunk handling is now supported.

  Option to eliminate all floating point support was added.  Some new

    fixed-point functions such as png_set_gAMA_fixed() were added.

  Expanded tabs and removed trailing blanks in source files.

version 1.0.5i [December 13, 1999]

  Added some type casts to silence compiler warnings.

  Renamed "png_free_spalette" to "png_free_spalettes" for consistency.

  Removed leading blanks from a #define in pngvcrd.c

  Added some parameters to the new png_set_keep_unknown_chunks() function.

  Added a test for up->location != 0 in the first instance of writing

    unknown chunks in pngwrite.c

  Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to

    prevent recursion.

  Added png_free_hIST() function.

  Various patches to fix bugs in the sCAL and integer cHRM processing,

    and to add some convenience macros for use with sCAL.

version 1.0.5j [December 21, 1999]

  Changed "unit" parameter of png_write_sCAL from png_byte to int, to work

    around buggy compilers.

  Added new type "png_fixed_point" for integers that hold float*100000 values

  Restored backward compatibility of tEXt/zTXt chunk processing:

    Restored the first four members of png_text to the same order as v.1.0.5d.

    Added members "lang_key" and "itxt_length" to png_text struct.  Set

    text_length=0 when "text" contains iTXt data.  Use the "compression"

    member to distinguish among tEXt/zTXt/iTXt types.  Added

    PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.

    The "Note" above, about backward incompatibility of libpng-1.0.5e, no

    longer applies.

  Fixed png_read|write_iTXt() to read|write parameters in the right order,

    and to write the iTXt chunk after IDAT if it appears in the end_ptr.

  Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)

  Reversed the order of trying to write floating-point and fixed-point gAMA.

version 1.0.5k [December 27, 1999]

  Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"

  Added png_handle_as_unknown() function (Glenn)

  Added png_free_chunk_list() function and chunk_list and num_chunk_list members

    of png_ptr.

  Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.

  Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings

    about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)

  Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).

  Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.

  Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().

version 1.0.5l [January 1, 2000]

  Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()

    for setting a callback function to handle unknown chunks and for

    retrieving the associated user pointer (Glenn).

version 1.0.5m [January 7, 2000]

  Added high-level functions png_read_png(), png_write_png(), png_free_pixels().

version 1.0.5n [January 9, 2000]

  Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its

    own memory for info_ptr->palette.  This makes it safe for the calling

    application to free its copy of the palette any time after it calls

    png_set_PLTE().

version 1.0.5o [January 20, 2000]

  Cosmetic changes only (removed some trailing blanks and TABs)

version 1.0.5p [January 31, 2000]

  Renamed pngdll.mak to makefile.bd32

  Cosmetic changes in pngtest.c

version 1.0.5q [February 5, 2000]

  Relocated the makefile.solaris warning about PATH problems.

  Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)

  Revised makefile.gcmmx

  Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros

version 1.0.5r [February 7, 2000]

  Removed superfluous prototype for png_get_itxt from png.h

  Fixed a bug in pngrtran.c that improperly expanded the background color.

  Return *num_text=0 from png_get_text() when appropriate, and fix documentation

    of png_get_text() in libpng.txt/libpng.3.

version 1.0.5s [February 18, 2000]

  Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the

    new error handler that's planned for the next libpng release, and changed

    example.c, pngtest.c, and contrib programs to use this macro.

  Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)

  Fixed a bug in png_read_png() that caused it to fail to expand some images

    that it should have expanded.

  Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions

    in pngget.c

  Changed the allocation of palette, history, and trans arrays back to

    the version 1.0.5 method (linking instead of copying) which restores

    backward compatibility with version 1.0.5.  Added some remarks about

    that in example.c.  Added "free_me" member to info_ptr and png_ptr

    and added png_free_data() function.

  Updated makefile.linux and makefile.gccmmx to make directories conditionally.

  Made cosmetic changes to pngasmrd.h

  Added png_set_rows() and png_get_rows(), for use with png_read|write_png().

  Modified png_read_png() to allocate info_ptr->row_pointers only if it

    hasn't already been allocated.

version 1.0.5t [March 4, 2000]

  Changed png_jmp_env() migration aiding macro to png_jmpbuf().

  Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c

  Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when

    PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b

  Files in contrib/gregbook were revised to use png_jmpbuf() and to select

    a 24-bit visual if one is available, and to allow abbreviated options.

  Files in contrib/pngminus were revised to use the png_jmpbuf() macro.

  Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s

version 1.0.5u [March 5, 2000]

  Simplified the code that detects old png.h in png.c and pngtest.c

  Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)

  Increased precision of rgb_to_gray calculations from 8 to 15 bits and

    added png_set_rgb_to_gray_fixed() function.

  Added makefile.bc32 (32-bit Borland C++, C mode)

version 1.0.5v [March 11, 2000]

  Added some parentheses to the png_jmpbuf macro definition.

  Updated references to the zlib home page, which has moved to freesoftware.com.

  Corrected bugs in documentation regarding png_read_row() and png_write_row().

  Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.

  Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,

    revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)

version 1.0.6 [March 20, 2000]

  Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c

  Added makefile.sggcc (SGI IRIX with gcc)

version 1.0.6d [April 7, 2000]

  Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO

  Added data_length parameter to png_decompress_chunk() function

  Revised documentation to remove reference to abandoned png_free_chnk functions

  Fixed an error in png_rgb_to_gray_fixed()

  Revised example.c, usage of png_destroy_write_struct().

  Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file

  Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c

  Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().

version 1.0.6e [April 9, 2000]

  Added png_data_freer() function.

  In the code that checks for over-length tRNS chunks, added check of

    info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)

  Minor revisions of libpng.txt/libpng.3.

  Check for existing data and free it if the free_me flag is set, in png_set_*()

    and png_handle_*().

  Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED

    is defined.

  Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c

    and mentioned the purposes of the two macros in libpng.txt/libpng.3.

version 1.0.6f [April 14, 2000]

  Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.

  Add checks in png_set_text() for NULL members of the input text structure.

  Revised libpng.txt/libpng.3.

  Removed superfluous prototype for png_set_itxt from png.h

  Removed "else" from pngread.c, after png_error(), and changed "0" to "length".

  Changed several png_errors about malformed ancillary chunks to png_warnings.

version 1.0.6g [April 24, 2000]

  Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.

  Relocated paragraph about png_set_background() in libpng.3/libpng.txt

    and other revisions (Matthias Benckmann)

  Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and

    png_ptr members to restore binary compatibility with libpng-1.0.5

    (breaks compatibility with libpng-1.0.6).

version 1.0.6h [April 24, 2000]

  Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds

    libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)

    This is a temporary change for test purposes.

version 1.0.6i [May 2, 2000]

  Rearranged some members at the end of png_info and png_struct, to put

    unknown_chunks_num and free_me within the original size of the png_structs

    and free_me, png_read_user_fn, and png_free_fn within the original png_info,

    because some old applications allocate the structs directly instead of

    using png_create_*().

  Added documentation of user memory functions in libpng.txt/libpng.3

  Modified png_read_png so that it will use user_allocated row_pointers

    if present, unless free_me directs that it be freed, and added description

    of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.

  Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version

    1.00) members of png_struct and png_info, to regain binary compatibility

    when you define this macro.  Capabilities lost in this event

    are user transforms (new in version 1.0.0),the user transform pointer

    (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,

    the high-level interface, and unknown chunks support (all new in 1.0.6).

    This was necessary because of old applications that allocate the structs

    directly as authors were instructed to do in libpng-0.88 and earlier,

    instead of using png_create_*().

  Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which

    can be used to detect codes that directly allocate the structs, and

    code to check these modes in png_read_init() and png_write_init() and

    generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED

    was not defined.

  Added makefile.intel and updated makefile.watcom (Pawel Mrochen)

version 1.0.6j [May 3, 2000]

  Overloaded png_read_init() and png_write_init() with macros that convert

    calls to png_read_init_2() or png_write_init_2() that check the version

    and structure sizes.

version 1.0.7beta11 [May 7, 2000]

  Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes

    which are no longer used.

  Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is

    defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED

    is defined.

  Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory

    overrun when old applications fill the info_ptr->text structure directly.

  Added PNGAPI macro, and added it to the definitions of all exported functions.

  Relocated version macro definitions ahead of the includes of zlib.h and

    pngconf.h in png.h.

version 1.0.7beta12 [May 12, 2000]

  Revised pngset.c to avoid a problem with expanding the png_debug macro.

  Deleted some extraneous defines from pngconf.h

  Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.

  Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.

  Added png_access_version_number() function.

  Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().

  Expanded libpng.3/libpng.txt information about png_data_freer().

version 1.0.7beta14 [May 17, 2000] (beta13 was not published)

  Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as

    warnings instead of errors, as pngrutil.c does.

  Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()

    will actually write IDATs.

  Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.

  Make png_free_data() ignore its final parameter except when freeing data

    that can have multiple instances (text, sPLT, unknowns).

  Fixed a new bug in png_set_rows().

  Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.

  Added png_set_invalid() function.

  Fixed incorrect illustrations of png_destroy_write_struct() in example.c.

version 1.0.7beta15 [May 30, 2000]

  Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce

    fewer error messages.

  Rearranged checks for Z_OK to check the most likely path first in pngpread.c

    and pngwutil.c.

  Added checks in pngtest.c for png_create_*() returning NULL, and mentioned

    in libpng.txt/libpng.3 the need for applications to check this.

  Changed names of png_default_*() functions in pngtest to pngtest_*().

  Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.

  Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c

  Set each pointer to NULL after freeing it in png_free_data().

  Worked around a problem in pngconf.h; AIX's strings.h defines an "index"

    macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)

  Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).

version 1.0.7beta16 [June 4, 2000]

  Revised the workaround of AIX string.h "index" bug.

  Added a check for overlength PLTE chunk in pngrutil.c.

  Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer

    indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.

  Added a warning in png_decompress_chunk() when it runs out of data, e.g.

    when it tries to read an erroneous PhotoShop iCCP chunk.

  Added PNG_USE_DLL macro.

  Revised the copyright/disclaimer/license notice.

  Added contrib/msvctest directory

version 1.0.7rc1 [June 9, 2000]

  Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)

  Added contrib/visupng directory (Willem van Schaik)

version 1.0.7beta18 [June 23, 2000]

  Revised PNGAPI definition, and pngvcrd.c to work with __GCC__

    and do not redefine PNGAPI if it is passed in via a compiler directive.

  Revised visupng/PngFile.c to remove returns from within the Try block.

  Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.

  Updated contrib/visupng/cexcept.h to version 1.0.0.

  Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.

version 1.0.7rc2 [June 28, 2000]

  Updated license to include disclaimers required by UCITA.

  Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.

version 1.0.7 [July 1, 2000]

  Revised the definition of "trans_values" in libpng.3/libpng.txt

version 1.0.8beta1 [July 8, 2000]

  Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.

  Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and

     pngwutil.c.

  Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.

  Removed unused "#include <assert.h>" from png.c

  Added WindowsCE support.

  Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.

version 1.0.8beta2 [July 10, 2000]

  Added project files to the wince directory and made further revisions

     of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.

version 1.0.8beta3 [July 11, 2000]

  Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()

     for indexed-color input files to avoid potential double-freeing trans array

     under some unusual conditions; problem was introduced in version 1.0.6f.

  Further revisions to pngtest.c and files in the wince subdirectory.

version 1.0.8beta4 [July 14, 2000]

  Added the files pngbar.png and pngbar.jpg to the distribution.

  Added makefile.cygwin, and cygwin support in pngconf.h

  Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)

version 1.0.8rc1 [July 16, 2000]

  Revised png_debug() macros and statements to eliminate compiler warnings.

version 1.0.8 [July 24, 2000]

  Added png_flush() in pngwrite.c, after png_write_IEND().

  Updated makefile.hpux to build a shared library.

version 1.0.9beta1 [November 10, 2000]

  Fixed typo in scripts/makefile.hpux

  Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)

  Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)

  Changed "cdrom.com" in documentation to "libpng.org"

  Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).

  Changed type of "params" from voidp to png_voidp in png_read|write_png().

  Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.

  Revised the 3 instances of WRITEFILE in pngtest.c.

  Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.

  Updated png.rc in dll/msvc project

  Revised makefile.dec to define and use LIBPATH and INCPATH

  Increased size of global png_libpng_ver[] array from 12 to 18 chars.

  Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.

  Removed duplicate png_crc_finish() from png_handle_bKGD() function.

  Added a warning when application calls png_read_update_info() multiple times.

  Revised makefile.cygwin