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-
-Libpng 1.5.1 - February 3, 2011
-
-This is a public release of libpng, intended for use in production codes.
-
-Files available for download:
-
-Source files with LF line endings (for Unix/Linux) and with a
-"configure" script
-
- libpng-1.5.1.tar.xz (LZMA-compressed, recommended)
- libpng-1.5.1.tar.gz
- libpng-1.5.1.tar.bz2
-
-Source files with CRLF line endings (for Windows), without the
-"configure" script
-
- lpng151.7z (LZMA-compressed, recommended)
- lpng151.zip
-
-Other information:
-
- libpng-1.5.1-README.txt
- libpng-1.5.1-LICENSE.txt
-
-Changes since the last public release (1.5.0):
-
- Added description of png_set_crc_action() to the manual.
- Added a note in the manual that the type of the iCCP profile was changed
- from png_charpp to png_bytepp in png_get_iCCP(). Similarly,
- it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
- Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
- internally happens to call it with one.
- Fixed the failure to handle palette mapped images correctly.
- Fixed a bug in handling of interlaced images (bero at arklinux.org).
- Updated CMakeLists.txt (Clifford Yapp)
- Fixed typecasting of some png_debug() statements (Cosmin)
- Updated documentation of png_set|get_tRNS() (Thomas Klausner).
- Mentioned in the documentation that applications must #include "zlib.h"
- if they need access to anything in zlib.h, and that a number of
- macros such as png_memset() are no longer accessible by applications.
- Corrected pngvalid gamma test "sample" function to access all of the color
- samples of each pixel, instead of sampling the red channel three times.
- Changed variable names index, div, exp, and gamma to char_index, divisor,
- exp_b10, and gamma_val, respectively, to avoid "shadow" warnings.
- Prevent png_push_crc_skip() from hanging while reading an unknown chunk
- or an over-large compressed zTXt chunk with the progressive reader.
- Eliminated more GCC "shadow" warnings.
- Revised png_fixed() in png.c to avoid compiler warning about reaching the
- end without returning anything.
- In the manual, describe the png_get_IHDR() arguments in the correct order.
- Added const_png_structp and const_png_infop types, and used them in
- prototypes for most png_get_*() functions.
- Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
- Added synopses for the IO_STATE functions and other missing synopses
- to the manual. Removed the synopses from libpngpf.3 because they
- were out of date and no longer useful. Better information can be
- obtained by reading the prototypes and comments in pngpriv.h
- Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
- Added a make macro DFNCPP that is a CPP that will accept the tokens in
- a .dfn file and adds configure stuff to test for such a CPP. ./configure
- should fail if one is not available.
- Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
- Added png_get_current_row_number and png_get_current_pass_number for the
- benefit of the user transform callback.
- Added png_process_data_pause and png_process_data_skip for the benefit of
- progressive readers that need to stop data processing or want to optimize
- skipping of unread data (e.g. if the reader marks a chunk to be skipped.)
- Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
- pngvalid contains tests of transforms, which tests are currently disabled
- because they are incompletely tested. gray_to_rgb was failing to expand
- the bit depth for smaller bit depth images; this seems to be a long
- standing error and resulted, apparently, in invalid output. The
- documentation did not accurately describe what libpng really does when
- converting RGB to gray.
- Fixed incorrect examples of callback prototypes in the manual, that were
- introduced in libpng-1.0.0.
- In addition the order of the png_get_uint macros with respect to the
- relevant function definitions has been reversed. This helps the
- preprocessing of the symbol files be more robust. Furthermore, the
- symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
- the library may actually be built with PNG_USE_READ_MACROS; this stops
- the read macros interfering with the symbol file format.
- Made the manual, synopses, and function prototypes use the function
- argument names file_gamma, int_file_gamma, and srgb_intent consistently.
- Changed PNG_UNUSED from "param=param;" to "(void)param;".
- Added transform tests to pngvalid and simplified the arguments.
- Added a request in the manual that applications do not use "png_" or
- "PNG_" to begin any of their own symbols.
-
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
-to subscribe) or to glennrp at users.sourceforge.net
-
-Glenn R-P