[alpha] Imported from libpng-1.6.0alpha01.tar

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.0alpha01 - January 4, 2010
+Libpng 1.6.0alpha01 - September 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.
@@ -9,53 +9,81 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.5.0alpha01.tar.xz (LZMA-compressed, recommended)
-   1.5.0alpha01.tar.gz
-   1.5.0alpha01.tar.bz2
+   1.6.0alpha01.tar.xz (LZMA-compressed, recommended)
+   1.6.0alpha01.tar.gz
+   1.6.0alpha01.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp150a01.zip
-   lp150a01.7z
+   lp160a01.7z  (LZMA-compressed, recommended)
+   lp160a01.zip
 
 Other information:
 
-   1.5.0alpha01-README.txt
-   1.5.0alpha01-LICENSE.txt
+   1.6.0alpha01-README.txt
+   1.6.0alpha01-LICENSE.txt
 
-Changes since the last public release (1.4.0):
+Changes since the last public release (1.5.4):
 
-version 1.4.1alpha02 [December 11, 2009]
-  Restored premultiplied alpha feature from version 1.4.0beta105.
-  Added "double gamma" to parameters for png_set_premultiply_alpha().
-  Added "float postmultiply_gamma" member to the png_struct.
-  Moved PNG_DIVIDE_BY_255, PNG_8_BIT_PREMULTIPLY(), etc., from
+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 1.5.0alpha01 [January 4, 2010]
-  Bump version to 1.5.0alpha01
-  Add "depth" parameter to private png_build_gamma_table()
-  Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
-  Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt
-    (revising the change in 1.4.0beta99)
-  Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-    in pngset.c to be consistent with other changes in version 1.2.38.
-  Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and
-    Makefile.in to be consistent with changes in libpng-1.4.0rc03
-  Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
-    in pngtest.c
-  Recognize and use "--sysroot=DIR" in libpng-config.in and libpng.pc.in
-  Recognize and use environment variable $PKG_CONFIG_SYSROOT_DIR as default
-    setting of ${sysroot} in libpng.pc.in
-  Removed the just-added sysroot feature.  It is the job of pkg-config,
-    not foo.pc, to mangle the directory locations when $PKG_CONFIG_SYSROOT_DIR
-    has been defined.
-  Updated CMakeLists.txt for consistent indentation and to avoid an
-    unclosed if-statement warning (Philip Lowman).
-  Revised Makefile.am and makefile.in to remove references to Y2KINFO,
-    KNOWNBUG, and libpng.la (Robert Schwebel)
+Version 1.5.5beta02 [July 14, 2011]
+  Revised Makefile.am and Makefile.in to look in the right directory for
+    pnglibconf.h.prebuilt
 
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+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 (introduced in 1.5.4) has 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 3, 2011]
+    Added "$(ARCH)" option to makefile.darwin
+    Added SunOS support to configure.ac and Makefile.am
+
+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