1Libpng 1.6.17 - March 26, 2015
 2
 3This is a public release of libpng, intended for use in production codes.
 4
 5Files available for download:
 6
 7Source files with LF line endings (for Unix/Linux) and with a
 8"configure" script
 9
10   libpng-1.6.17.tar.xz (LZMA-compressed, recommended)
11   libpng-1.6.17.tar.gz
12
13Source files with CRLF line endings (for Windows), without the
14"configure" script
15
16   lpng1617.7z  (LZMA-compressed, recommended)
17   lpng1617.zip
18
19Other information:
20
21   libpng-1.6.17-README.txt
22   libpng-1.6.17-LICENSE.txt
23   libpng-1.6.17-*.asc (armored detached GPG signatures)
24
25Changes since the last public release (1.6.16):
26
27  Removed duplicate PNG_SAFE_LIMITS_SUPPORTED handling from pngconf.h
28  Corrected the width limit calculation in png_check_IHDR().
29  Removed user limits from pngfix. Also pass NULL pointers to
30    png_read_row to skip the unnecessary row de-interlace stuff.
31  Added testing of png_set_packing() to pngvalid.c
32  Regenerated configure scripts in the *.tar distributions with libtool-2.4.4
33  Implement previously untested cases of libpng transforms in pngvalid.c
34  Fixed byte order in 2-byte filler, in png_do_read_filler().
35  Made the check for out-of-range values in png_set_tRNS() detect
36    values that are exactly 2^bit_depth, and work on 16-bit platforms.
37  Merged some parts of libpng-1.6.17beta01 and libpng-1.7.0beta47.
38  Added #ifndef __COVERITY__ where needed in png.c, pngrutil.c and
39    pngset.c to avoid warnings about dead code.
40  Do not build png_product2() when it is unused.
41  Display user limits in the output from pngtest.
42  Eliminated the PNG_SAFE_LIMITS macro and restored the 1-million-column
43    and 1-million-row default limits in pnglibconf.dfa, that can be reset
44    by the user at build time or run time.  This provides a more robust
45    defense against DOS and as-yet undiscovered overflows.
46  Added PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED macro, on by default.
47  Allow user to call png_get_IHDR() with NULL arguments (Reuben Hawkins).
48  Rebuilt configure scripts with automake-1.15 and libtool-2.4.6
49  Moved png_set_filter() prototype into a PNG_WRITE_SUPPORTED block
50    of png.h.
51  Avoid runtime checks when converting integer to png_byte with
52    Visual Studio (Sergey Kosarevsky)
53  Removed some comments that the configure script did not handle
54    properly from scripts/pnglibconf.dfa and pnglibconf.h.prebuilt.
55  Free the unknown_chunks structure even when it contains no data.
56  Updated CMakeLists.txt to add OSX framework, change YES/NO to ON/OFF
57    for consistency, and remove some useless tests (Alexey Petruchik).
58  Remove pnglibconf.h, pnglibconf.c, pnglibconf.pre, pnglibconf.dfn,
59    and pnglibconf.out instead of pnglibconf.* in "make clean" (Cosmin).
60  Fixed simplified 8-bit-linear to sRGB alpha. The calculated alpha
61    value was wrong.  It's not clear if this affected the final stored
62    value; in the obvious code path the upper and lower 8-bits of the
63    alpha value were identical and the alpha was truncated to 8-bits
64    rather than dividing by 257 (John Bowler).
65
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71
72Glenn R-P