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src/Source/LibPNG/CHANGES  view on Meta::CPAN

    behavior changes between libpng14 and libpng15.

Version 1.5.4beta06 [June 18, 2011]
  Fixed new bug that was causing both strip_16 and scale_16 to be applied.

Version 1.5.4beta07 [June 19, 2011]
  Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
    The ACCURATE scale macro is no longer defined in 1.5 - call the
    png_scale_16_to_8 API.  Made sure that PNG_READ_16_TO_8 is still defined
    if the png_strip_16_to_8 API is present.  png_check_fp_number now
    maintains some state so that positive, negative and zero values are
    identified.  sCAL uses these to be strictly spec conformant.

Version 1.5.4beta08 [June 23, 2011]
  Fixed pngvalid if ACCURATE_SCALE is defined.
  Updated scripts/pnglibconf.h.prebuilt.

Version 1.5.4rc01 [June 30, 2011]
  Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.

Version 1.5.4 [July 7, 2011]
  No changes.

Version 1.5.5beta01 [July 13, 2011]
  Fixed some typos and made other minor changes in the manual.
  Updated contrib/pngminus/makefile.std (Samuli Souminen)

Version 1.5.5beta02 [July 14, 2011]
  Revised Makefile.am and Makefile.in to look in the right directory for
    pnglibconf.h.prebuilt

Version 1.5.5beta03 [July 27, 2011]
  Enabled compilation with g++ compiler.  This compiler does not recognize
    the file extension, so it always compiles with C++ rules.  Made minor
    changes to pngrutil.c to cast results where C++ expects it but C does not.
  Minor editing of libpng.3 and libpng-manual.txt.

Version 1.5.5beta04 [July 29, 2011]
  Revised CMakeLists.txt (Clifford Yapp)
  Updated commentary about the png_rgb_to_gray() default coefficients
    in the manual and in pngrtran.c

Version 1.5.5beta05 [August 17, 2011]
  Prevent unexpected API exports from non-libpng DLLs on Windows.  The "_DLL"
    is removed from the test of whether a DLL is being built (this erroneously
    caused the libpng APIs to be marked as DLL exports in static builds under
    Microsoft Visual Studio).  Almost all of the libpng building configuration
    is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
    pngconf.h, though, so that it is colocated with the import definition (it
    is no longer used anywhere in the installed headers).  The VStudio project
    definitions have been cleaned up: "_USRDLL" has been removed from the
    static library builds (this was incorrect), and PNG_USE_DLL has been added
    to pngvalid to test the functionality (pngtest does not supply it,
    deliberately).  The spurious "_EXPORTS" has been removed from the
    libpng build (all these errors were a result of copy/paste between project
    configurations.)
  Added new types and internal functions for CIE RGB end point handling to
    pngpriv.h (functions yet to be implemented).

Version 1.5.5beta06 [August 26, 2011]
  Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
    (Clifford Yap)
  Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
    The rgb_to_gray code had errors when combined with gamma correction.
    Some pixels were treated as true grey when they weren't and such pixels
    and true grey ones were not gamma corrected (the original value of the
    red component was used instead).  APIs to get and set cHRM using color
    space end points have been added and the rgb_to_gray code that defaults
    based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
    VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
  A considerable number of tests has been added to pngvalid for the
    rgb_to_gray transform.
  Arithmetic errors in rgb_to_gray whereby the calculated gray value was
    truncated to the bit depth rather than rounded have been fixed except in
    the 8-bit non-gamma-corrected case (where consistency seems more important
    than correctness.)  The code still has considerable inaccuracies in the
    8-bit case because 8-bit linear arithmetic is used.

Version 1.5.5beta07 [September 7, 2011]
  Added "$(ARCH)" option to makefile.darwin
  Added SunOS support to configure.ac and Makefile.am
  Changed png_chunk_benign_error() to png_warning() in png.c, in
    png_XYZ_from_xy_checked().

Version 1.5.5beta08 [September 10, 2011]
  Fixed 64-bit compilation errors (gcc). The errors fixed relate
    to conditions where types that are 32 bits in the GCC 32-bit
    world (uLong and png_size_t) become 64 bits in the 64-bit
    world.  This produces potential truncation errors which the
    compiler correctly flags.
  Relocated new HAVE_SOLARIS_LD definition in configure.ac
  Constant changes for 64-bit compatibility (removal of L suffixes). The
    16-bit cases still use "L" as we don't have a 16-bit test system.

Version 1.5.5rc01 [September 15, 2011]
  Removed "L" suffixes in pngpriv.h

Version 1.5.5 [September 22, 2011]
  No changes.

Version 1.5.6beta01 [September 22, 2011]
  Fixed some 64-bit type conversion warnings in pngrtran.c
  Moved row_info from png_struct to a local variable.
  The various interlace mask arrays have been made into arrays of
    bytes and made PNG_CONST and static (previously some arrays were
    marked PNG_CONST and some weren't).
  Additional checks have been added to the transform code to validate the
    pixel depths after the transforms on both read and write.
  Removed some redundant code from pngwrite.c, in png_destroy_write_struct().
  Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
    This removes the need to allocate temporary strings for chunk names on
    the stack in the read/write code.  Unknown chunk handling still uses the
    string form because this is exposed in the API.

Version 1.5.6beta02 [September 26, 2011]
  Added a note in the manual the png_read_update_info() must be called only
    once with a particular info_ptr.
  Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.

Version 1.5.6beta03 [September 28, 2011]
  Revised test-pngtest.sh to report FAIL when pngtest fails.

src/Source/LibPNG/CHANGES  view on Meta::CPAN

  Added png_convert_to_rfc1123_buffer() and deprecated png_convert_to_rfc1123()
    to avoid including a spurious buffer in the png_struct.

Version 1.6.0beta04 [December 30, 2011]
  Regenerated configure scripts with automake-1.11.2
  Eliminated png_info_destroy(). It is now used only in png.c and only calls
    one other internal function and memset().
  Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
    it was disabled whenever internal fixed point arithmetic was selected,
    which meant it didn't exist even on systems where FP was available but not
    preferred.
  Added pngvalid.c compile time checks for const APIs.
  Implemented 'restrict' for png_info and png_struct. Because of the way
    libpng works both png_info and png_struct are always accessed via a
    single pointer.  This means adding C99 'restrict' to the pointer gives
    the compiler some opportunity to optimize the code.  This change allows
    that.
  Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
    location in configure.ac (Gilles Espinasse).
  Changed png_memcpy to C assignment where appropriate. Changed all those
    uses of png_memcpy that were doing a simple assignment to assignments
    (all those cases where the thing being copied is a non-array C L-value).
  Added some error checking to png_set_*() routines.
  Removed the reference to the non-exported function png_memcpy() from
    example.c.
  Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
    it had become misaligned.
  Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
    and unsigned long are of different sizes.

Version 1.6.0beta05 [January 15, 2012]
  Updated manual with description of the simplified API (copied from png.h)
  Fix bug in pngerror.c: some long warnings were being improperly truncated
    (CVE-2011-3464, bug introduced in libpng-1.5.3beta05).

Version 1.6.0beta06 [January 24, 2012]
  Added palette support to the simplified APIs. This commit
    changes some of the macro definitions in png.h, app code
    may need corresponding changes.
  Increased the formatted warning buffer to 192 bytes.
  Added color-map support to simplified API. This is an initial version for
    review; the documentation has not yet been updated.
  Fixed Min/GW uninstall to remove libpng.dll.a

Version 1.6.0beta07 [January 28, 2012]
  Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
    compiler issues slightly different warnings from those issued by the
    current vesions of GCC. This eliminates those warnings by
    adding/removing casts and small code rewrites.
  Updated configure.ac from autoupdate: added --enable-werror option.
    Also some layout regularization and removal of introduced tab characters
    (replaced with 3-character indentation).  Obsolete macros identified by
    autoupdate have been removed; the replacements are all in 2.59 so
    the pre-req hasn't been changed.  --enable-werror checks for support
    for -Werror (or the given argument) in the compiler.  This mimics the
    gcc configure option by allowing -Werror to be turned on safely; without
    the option the tests written in configure itself fail compilation because
    they cause compiler warnings.
  Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
  Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
    set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
  Freeze libtool files in the 'scripts' directory. This version of autogen.sh
    attempts to dissuade people from running it when it is not, or should not,
    be necessary.  In fact, autogen.sh does not work when run in a libpng
    directory extracted from a tar distribution anymore. You must run it in
    a GIT clone instead.
  Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
    and renamed three whose names were inconsistent with those in
    pngsuite/README.txt.

Version 1.6.0beta08 [February 1, 2012]
  Fixed Image::colormap misalignment in pngstest.c
  Check libtool/libtoolize version number (2.4.2) in configure.ac
  Divide test-pngstest.sh into separate pngstest runs for basic and
    transparent images.
  Moved automake options to AM_INIT_AUTOMAKE in configure.ac
  Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
    version checking to configure.ac
  Improved pngstest speed by not doing redundant tests and add const to
    the background parameter of png_image_finish_read. The --background
    option is now done automagically only when required, so that commandline
    option no longer exists.
  Cleaned up pngpriv.h to consistently declare all functions and data.
    Also eliminated PNG_CONST_DATA, which is apparently not needed but we
    can't be sure until it is gone.
  Added symbol prefixing that allows all the libpng external symbols
    to be prefixed (suggested by Reuben Hawkins).
  Updated "ftbb*.png" list in the owatcom and vstudio projects.
  Fixed 'prefix' builds on clean systems. The generation of pngprefix.h
    should not require itself.
  Updated INSTALL to explain that autogen.sh must be run in a GIT clone,
    not in a libpng directory extracted from a tar distribution.

Version 1.6.0beta09 [February 1, 2012]
  Reverted the prebuilt configure files to libpng-1.6.0beta05 condition.

Version 1.6.0beta10 [February 3, 2012]
  Added Z_SOLO for zlib-1.2.6+ and correct pngstest tests
  Updated list of test images in CMakeLists.txt
  Updated the prebuilt configure files to current condition.
  Revised INSTALL information about autogen.sh; it works in tar distributions.

Version 1.6.0beta11 [February 16, 2012]
  Fix character count in pngstest command in projects/owatcom/pngstest.tgt
  Revised test-pngstest.sh to report PASS/FAIL for each image.
  Updated documentation about the simplified API.
  Corrected estimate of error in libpng png_set_rgb_to_gray API.  The API is
    extremely inaccurate for sRGB conversions because it uses an 8-bit
    intermediate linear value and it does not use the sRGB transform, so it
    suffers from the known instability in gamma transforms for values close
    to 0 (see Poynton).  The net result is that the calculation has a maximum
    error of 14.99/255; 0.5/255^(1/2.2).  pngstest now uses 15 for the
    permitted 8-bit error. This may still not be enough because of arithmetic
    error.
  Removed some unused arrays (with #ifdef) from png_read_push_finish_row().
  Fixed a memory overwrite bug in simplified read of RGB PNG with
    non-linear gamma Also bugs in the error checking in pngread.c and changed
    quite a lot of the checks in pngstest.c to be correct; either correctly
    written or not over-optimistic.  The pngstest changes are insufficient to
    allow all possible RGB transforms to be passed; pngstest cmppixel needs
    to be rewritten to make it clearer which errors it allows and then changed