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Imported from libpng-1.0.9beta5.tar

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Glenn Randers-Pehrson
2000-12-15 08:54:42 -06:00
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libpng.txt
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@@ -1,6 +1,6 @@
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.9beta4 - December 1, 2000
libpng version 1.0.9beta5 - December 15, 2000
Updated and distributed by Glenn Randers-Pehrson
<randeg@alum.rpi.edu>
Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -2581,7 +2581,24 @@ When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
VI. Changes to Libpng from version 0.88
VI. MNG support
The MNG specification (available at http://www.libpng.org/pub/mng) allows
certain extensions to PNG for PNG images that are embedded in MNG datastreams.
Libpng can support some of these extensions. To enable them, use the
png_permit_mng_features() function:
feature_set = png_permit_mng_features(png_ptr, mask)
mask is a png_uint_32 containing the logical OR of the
features you want to enable. These include
PNG_FLAG_MNG_EMPTY_PLTE
PNG_FLAG_MNG_FILTER_64
PNG_ALL_MNG_FEATURES
feature_set is a png_32_uint that is the logical AND of
your mask with the set of MNG features that is
supported by the version of libpng that you are using.
VII. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by
@@ -2630,15 +2647,15 @@ application:
png_uint_32 application_vn = PNG_LIBPNG_VER;
VII. Y2K Compliance in libpng
VIII. Y2K Compliance in libpng
December 1, 2000
December 15, 2000
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.71 and
upward through 1.0.9beta4 are Y2K compliant. It is my belief that earlier
upward through 1.0.9beta5 are Y2K compliant. It is my belief that earlier
versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that