229 lines
11 KiB
Plaintext
229 lines
11 KiB
Plaintext
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Libpng 1.5.4beta04 - June 16, 2011
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This is not intended to be a public release. It will be replaced
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within a few weeks by a public version or by another test version.
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Files available for download:
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Source files with LF line endings (for Unix/Linux) and with a
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"configure" script
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1.5.4beta04.tar.xz (LZMA-compressed, recommended)
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1.5.4beta04.tar.gz
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1.5.4beta04.tar.bz2
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Source files with CRLF line endings (for Windows), without the
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"configure" script
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lp154b04.7z (LZMA-compressed, recommended)
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lp154b04.zip
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Other information:
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1.5.4beta04-README.txt
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1.5.4beta04-LICENSE.txt
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Changes since the last public release (1.5.2):
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Version 1.5.3beta01 [April 1, 2011]
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Re-initialize the zlib compressor before compressing non-IDAT chunks.
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Added API functions to set parameters for zlib compression of non-IDAT
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chunks.
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Version 1.5.3beta02 [April 3, 2011]
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Updated scripts/symbols.def with new API functions.
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Only compile the new zlib re-initializing code when text or iCCP is
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supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
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Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
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Optimize the zlib CMF byte in non-IDAT compressed chunks
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Version 1.5.3beta03 [April 16, 2011]
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Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
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snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
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than __STDC__ (John Bowler).
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Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
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the compiler that a user supplied callback (the error handler) does not
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return, yet there is no guarantee in practice that the application code
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will correctly implement the error handler because the compiler only
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issues a warning if there is a mistake (John Bowler).
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Removed the no-longer-used PNG_DEPSTRUCT macro.
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Updated the zlib version to 1.2.5 in the VStudio project.
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Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
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pngwutil.c (John Bowler).
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Fixed bug with stripping the filler or alpha channel when writing, that
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was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
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Version 1.5.3beta04 [April 27, 2011]
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Updated pngtest.png with the new zlib CMF optimization.
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Cleaned up conditional compilation code and of background/gamma handling
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Internal changes only except a new option to avoid compiling the
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png_build_grayscale_palette API (which is not used at all internally.)
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The main change is to move the transform tests (READ_TRANSFORMS,
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WRITE_TRANSFORMS) up one level to the caller of the APIs. This avoids
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calls to spurious functions if all transforms are disabled and slightly
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simplifies those functions. Pngvalid modified to handle this.
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A minor change is to stop the strip_16 and expand_16 interfaces from
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disabling each other; this allows the future alpha premultiplication
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code to use 16-bit intermediate values while still producing 8-bit output.
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png_do_background and png_do_gamma have been simplified to take a single
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pointer to the png_struct rather than pointers to every item required
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from the png_struct. This makes no practical difference to the internal
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code.
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A serious bug in the pngvalid internal routine 'standard_display_init' has
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been fixed - this failed to initialize the red channel and accidentally
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initialized the alpha channel twice.
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Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
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avoid a clash with the png_jmpbuf macro on some platforms.
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Version 1.5.3beta05 [May 6, 2011]
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Added appropriate feature test macros to ensure libpng sees the correct API
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_POSIX_SOURCE is defined in pngpriv.h, pngtest.c and pngvalid.c to ensure
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that POSIX conformant systems disable non-POSIX APIs. _ISOC99_SOURCE is
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defined in pngpriv.h to obtain the ISO C99 snprintf definition, when
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available.
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Removed png_snprintf and added formatted warning messages. This change adds
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internal APIs to allow png_warning messages to have parameters without
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requiring the host OS to implement snprintf. As a side effect the
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dependency of the tIME-supporting RFC1132 code on stdio is removed and
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PNG_NO_WARNINGS does actually work now.
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Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
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optimization configureable.
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IDAT compression failed if preceded by a compressed text chunk (bug
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introduced in libpng-1.5.3beta01-02). This was because the attempt to
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reset the zlib stream in png_write_IDAT happened after the first IDAT
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chunk had been deflated - much too late. In this change internal
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functions were added to claim/release the z_stream and, hopefully, make
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the code more robust. Also deflateEnd checking is added - previously
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libpng would ignore an error at the end of the stream.
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Version 1.5.3beta06 [May 8, 2011]
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Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
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Implemented premultiplied alpha support: png_set_alpha_mode API
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Version 1.5.3beta07 [May 11, 2011]
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Added expand_16 support to the high level interface.
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Added named value and 'flag' gamma support to png_set_gamma. Made a minor
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change from the previous (unreleased) ABI/API to hide the exact value used
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for Macs - it's not a good idea to embed this in the ABI!
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Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
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from pngpriv.h to png.h because they must be visible to applications
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that call png_set_unknown_chunks().
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Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
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before IDAT.
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Version 1.5.3beta08 [May 16, 2011]
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Improved "pngvalid --speed" to exclude more of pngvalid from the time.
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Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
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The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
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parameters are supplied by the caller), while in the absence of cHRM
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sRGB/Rec 709 values are still used.
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The bKGD chunk no longer overwrites the background value set by
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png_set_background(), allowing the latter to be used before the file
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header is read. It never performed any useful function to override
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the default anyway.
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Added memory overwrite and palette image checks to pngvalid.c
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Previously palette image code was poorly checked. Since the transformation
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code has a special palette path in most cases this was a severe weakness.
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Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
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expanding an indexed image, always expand to RGBA if transparency is
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present.
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Version 1.5.3beta09 [May 17, 2011]
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Reversed earlier 1.5.3 change of transformation order; move png_expand_16 back.
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The change doesn't work because it requires 16-bit gamma tables when the code
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only generates 8-bit ones. This fails silently; the libpng code just doesn't
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do any gamma correction. Moving the tests back leaves the old, inaccurate,
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8-bit gamma calculations, but these are clearly better than none!
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Version 1.5.3beta10 [May 20, 2011]
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png_set_background() and png_expand_16() did not work together correctly.
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This problem is present in 1.5.2; if png_set_background is called with
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need_expand false and the matching 16 bit color libpng erroneously just
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treats it as an 8-bit color because of where png_do_expand_16 is in the
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transform list. This simple fix reduces the supplied colour to 8-bits,
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so it gets smashed, but this is better than the current behavior.
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Added tests for expand16, more fixes for palette image tests to pngvalid.
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Corrects the code for palette image tests and disables attempts to
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validate palette colors.
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Version 1.5.3rc01 [June 3, 2011]
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No changes.
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Version 1.5.3rc02 [June 8, 2011]
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Fixed uninitialized memory read in png_format_buffer() (Bug report by
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Frank Busse, related to CVE-2004-0421).
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Version 1.5.3beta11 [June 11, 2011]
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Fixed png_handle_sCAL which is broken in 1.5; added sCAL to pngtest.png
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Revised documentation about png_set_user_limits() to say that it also affects
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png writing.
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Revised handling of png_set_user_limits() so that it can increase the
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limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
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reduce it.
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Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
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wrong (high by one) 25% of the time. Dividing by 257 with rounding is
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wrong in 128 out of 65536 cases. Getting the right answer all the time
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without division is easy.
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Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro.
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Added projects/owatcom, an IDE project for OpenWatcom to replace
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scripts/makefile.watcom. This project works with OpenWatcom 1.9. The
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IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
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The project is configurable, unlike the Visual Studio project, so long
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as the developer has an awk.
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Changed png_set_gAMA to limit the gamma value range so that the inverse
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of the stored value cannot overflow the fixed point representation,
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and changed other things OpenWatcom warns about.
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Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
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pngvalid to build when ALPHA_MODE is not supported, which is required if
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it is to build on libpng 1.4.
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Removed string/memory macros that are no longer used and are not
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necessarily fully supportable, particularly png_strncpy and png_snprintf.
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Added log option to pngvalid.c and attempted to improve gamma messages.
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Version 1.5.3 [omitted]
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People found the presence of a beta release following an rc release
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to be confusing; therefore we bump the version to libpng-1.5.4beta01
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and there will be no libpng-1.5.3 release.
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Version 1.5.4beta01 [June 14, 2011]
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Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
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to get the same (inaccurate) output as libpng-1.5.2 and earlier.
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Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE
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outside of an unknown-chunk block in png.h because they are also
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needed for other uses.
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Version 1.5.4beta02 [June 14, 2011]
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Fixed and clarified LEGACY 16-to-8 scaling code.
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Added png_set_chop_16() API, to match inaccurate results from previous
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libpng versions.
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Removed the ACCURATE and LEGACY options (they are no longer useable)
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Use the old scaling method for background if png_set_chop_16() was
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called.
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Made png_set_chop_16() API removeable with PNG_NO_READ_CHOP_16_TO_8_SUPPORTED
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Version 1.5.4beta03 [June 15, 2011]
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Fixed a problem in png_do_expand_palette() exposed by optimization in
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1.5.3beta06
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Also removed a spurious and confusing "trans" member ("trans") from png_info.
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The palette expand optimization prevented expansion to an intermediate RGBA
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form if tRNS was present but alpha was marked to be stripped; this exposed
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a check for tRNS in png_do_expand_palette() which is inconsistent with the
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code elsewhere in libpng.
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Correction to the expand_16 code; removed extra instance of
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png_set_scale_16_to_8 from pngpriv.h
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Version 1.5.4beta04 [June 16, 2011]
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Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
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Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
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Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again. If this is
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not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
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Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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(subscription required; visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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to subscribe) or to glennrp at users.sourceforge.net
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Glenn R-P
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