[libpng15] Bump version to libpng-1.5.7beta01

ANNOUNCE

@@ -1,87 +1,36 @@
-Libpng 1.5.6 - November 3, 2011
 
-This is a public release of libpng, intended for use in production codes.
+Libpng 1.5.7beta01 - November 3, 2011
+
+This is not intended to be a public release.  It will be replaced
+within a few weeks by a public version or by another test version.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.5.6.tar.xz (LZMA-compressed, recommended)
-   libpng-1.5.6.tar.gz
-   libpng-1.5.6.tar.bz2
+   1.5.7beta01.tar.xz (LZMA-compressed, recommended)
+   1.5.7beta01.tar.gz
+   1.5.7beta01.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng156.7z  (LZMA-compressed, recommended)
-   lpng156.zip
+   lp157b01.7z  (LZMA-compressed, recommended)
+   lp157b01.zip
 
 Other information:
 
-   libpng-1.5.6-README.txt
-   libpng-1.5.6-LICENSE.txt
+   1.5.7beta01-README.txt
+   1.5.7beta01-LICENSE.txt
 
-Changes since the last public release (1.5.5):
+Changes since the last public release (1.5.6):
 
-  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_desgtroy_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.
-  Added a note in the manual the png_read_update_info() must be called only
-    once with a particular info_ptr.
-  Revised test-pngtest.sh to report FAIL when pngtest fails.
-  Added "--strict" option to pngtest, to report FAIL when the failure is
-    only because the resulting valid files are different.
-  Revised CMakeLists.txt to work with mingw and removed some material from
-    CMakeLists.txt that is no longer useful in libpng-1.5.
-  Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")."
-  Speed up png_combine_row() for interlaced images. This reduces the generality
-    of the code, allowing it to be optimized for Adam7 interlace.  The masks
-    passed to png_combine_row() are now generated internally, avoiding
-    some code duplication and localizing the interlace handling somewhat.
-  Align png_struct::row_buf - previously it was always unaligned, caused by
-    a bug in the code that attempted to align it; the code needs to subtract
-    one from the pointer to take account of the filter byte prepended to
-    each row.
-  Optimized png_combine_row() when rows are aligned. This gains a small
-    percentage for 16-bit and 32-bit pixels in the typical case where the
-    output row buffers are appropriately aligned. The optimization was not
-    previously possible because the png_struct buffer was always misaligned.
-  Removed two redundant tests for unitialized row.
-  Fixed a relatively harmless memory overwrite in compressed text writing
-    with a 1 byte zlib buffer.
-  Add ability to call png_read_update_info multiple times to pngvalid.c
-  Fixes for multiple calls to png_read_update_info. These fixes attend to
-    most of the errors revealed in pngvalid, however doing the gamma work
-    twice results in inaccuracies that can't be easily fixed.  There is now
-    a warning in the code if this is going to happen.
-  Turned on multiple png_read_update_info in pngvalid transform tests.
-  Prevent libpng from overwriting unused bits at the end of the image when
-    it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
-    overwrite the partial byte at the end of each row if the row width was not
-    an exact multiple of 8 bits and the image is not interlaced.
-  Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
-    (Mans Rullgard).
-  Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
-  Added PNG_LSR() and PNG_LSL() macros to defend against buggy compilers that
-    evaluate non-taken code branches and complain about out-of-range shifts. 
-  Renamed the local variable 'byte' because it appears in a MSYS header
-    file.
-  Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
+Version 1.5.7 [November 3, 2011]
 
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+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
+to subscribe) or to glennrp at users.sourceforge.net
 
 Glenn R-P