reactos/dll/3rdparty/libpng/docs/ANNOUNCE

   1 Libpng 1.6.19 - November 12, 2015
   2
   3 This is a public release of libpng, intended for use in production codes.
   4
   5 Files available for download:
   6
   7 Source files with LF line endings (for Unix/Linux) and with a
   8 "configure" script
   9
  10    libpng-1.6.19.tar.xz (LZMA-compressed, recommended)
  11    libpng-1.6.19.tar.gz
  12
  13 Source files with CRLF line endings (for Windows), without the
  14 "configure" script
  15
  16    lpng1619.7z  (LZMA-compressed, recommended)
  17    lpng1619.zip
  18
  19 Other information:
  20
  21    libpng-1.6.19-README.txt
  22    libpng-1.6.19-LICENSE.txt
  23    libpng-1.6.19-*.asc (armored detached GPG signatures)
  24
  25 Changes since the last public release (1.6.18):
  26
  27   Updated obsolete information about the simplified API macros in the
  28     manual pages (Bug report by Arc Riley).
  29   Avoid potentially dereferencing NULL info_ptr in png_info_init_3().
  30   Rearranged png.h to put the major sections in the same order as
  31     in libpng17.
  32   Eliminated unused PNG_COST_SHIFT, PNG_WEIGHT_SHIFT, PNG_COST_FACTOR, and
  33     PNG_WEIGHT_FACTOR macros.
  34   Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
  35     (Bug report by Viktor Szakats).  Several warnings remain and are
  36     unavoidable, where we test for overflow.
  37   Fixed potential leak of png_pixels in contrib/pngminus/pnm2png.c
  38   Fixed uninitialized variable in contrib/gregbook/rpng2-x.c
  39   Moved config.h.in~ from the "libpng_autotools_files" list to the
  40     "libpng_autotools_extra" list in autogen.sh because it was causing a
  41     false positive for missing files (bug report by Robert C. Seacord).
  42   Removed unreachable "break" statements in png.c, pngread.c, and pngrtran.c
  43     to suppress clang warnings (Bug report by Viktor Szakats).
  44   Fixed some bad links in the man page.
  45   Changed "n bit" to "n-bit" in comments.
  46   Added signed/unsigned 16-bit safety net. This removes the dubious
  47     0x8000 flag definitions on 16-bit systems. They aren't supported
  48     yet the defs *probably* work, however it seems much safer to do this
  49     and be advised if anyone, contrary to advice, is building libpng 1.6
  50     on a 16-bit system. It also adds back various switch default clauses
  51     for GCC; GCC errors out if they are not present (with an appropriately
  52     high level of warnings).
  53   Safely convert num_bytes to a png_byte in png_set_sig_bytes() (Robert
  54     Seacord).
  55   Fixed the recently reported 1's complement security issue by replacing
  56     the value that is illegal in the PNG spec, in both signed and unsigned
  57     values, with 0. Illegal unsigned values (anything greater than or equal
  58     to  0x80000000) can still pass through, but since these are not illegal
  59     in ANSI-C (unlike 0x80000000 in the signed case) the checking that
  60     occurs later can catch them (John Bowler).
  61   Fixed png_save_int_32 when int is not 2's complement (John Bowler).
  62   Updated libpng16 with all the recent test changes from libpng17,
  63     including changes to pngvalid.c to ensure that the original,
  64     distributed, version of contrib/visupng/cexcept.h can be used
  65     (John Bowler).
  66   pngvalid contains the correction to the use of SAVE/STORE_
  67     UNKNOWN_CHUNKS; a bug revealed by changes in libpng 1.7. More
  68     tests contain the --strict option to detect warnings and the
  69     pngvalid-standard test has been corrected so that it does not
  70     turn on progressive-read. There is a separate test which does
  71     that. (John Bowler)
  72   Also made some signed/unsigned fixes.
  73   Make pngstest error limits version specific. Splitting the machine
  74     generated error structs out to a file allows the values to be updated
  75     without changing pngstest.c itself. Since libpng 1.6 and 1.7 have
  76     slightly different error limits this simplifies maintenance. The
  77     makepngs.sh script has also been updated to more accurately reflect
  78     current problems in libpng 1.7 (John Bowler).
  79   Incorporated new test PNG files into make check.  tests/pngstest-*
  80     are changed so that the new test files are divided into 8 groups by
  81     gamma and alpha channel.  These tests have considerably better code
  82     and pixel-value coverage than contrib/pngsuite; however,coverage is
  83     still incomplete (John Bowler).
  84   Removed the '--strict' in 1.6 because of the double-gamma-correction
  85     warning, updated pngstest-errors.h for the errors detected with the
  86     new contrib/testspngs PNG test files (John Bowler).
  87   Worked around rgb-to-gray issues in libpng 1.6.  The previous
  88     attempts to ignore the errors in the code aren't quite enough to
  89     deal with the 'channel selection' encoding added to libpng 1.7; abort.
  90   Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
  91     macro, therefore the argument list cannot contain preprocessing
  92     directives.  Make sure pow is a function where this happens. This is
  93     a minimal safe fix, the issue only arises in non-performance-critical
  94     code (bug report by Curtis Leach, fix by John Bowler).
  95   Added sPLT support to pngtest.c
  96   Prevent setting or writing over-length PLTE chunk (Cosmin Truta).
  97   Silently truncate over-length PLTE chunk while reading.
  98   Libpng incorrectly calculated the output rowbytes when the application
  99     decreased either the number of channels or the bit depth (or both) in
 100     a user transform.  This was safe; libpng overallocated buffer space
 101    (potentially by quite a lot; up to 4 times the amount required) but,
 102    from 1.5.4 on, resulted in a png_error (John Bowler).
 103   Fixed some inconsequential cut-and-paste typos in png_set_cHRM_XYZ_fixed().
 104   Clarified COPYRIGHT information to state explicitly that versions
 105     are derived from previous versions.
 106   Removed much of the long list of previous versions from png.h and
 107     libpng.3.
 108
 109 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 110 (subscription required; visit
 111 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 112 to subscribe)
 113 or to glennrp at users.sourceforge.net
 114
 115 Glenn R-P