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[libpng17] Update CHANGES and ANNOUNCE for Write code update (John Bowler)
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Glenn Randers-Pehrson
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22
ANNOUNCE
22
ANNOUNCE
@ -1,5 +1,5 @@
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Libpng 1.7.0beta80 - March 9, 2016
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Libpng 1.7.0beta80 - May 5, 2016
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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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@ -1264,7 +1264,25 @@ Version 1.7.0beta79 [March 9, 2016]
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(Robert C. Seacord). Various other flags in png.h made unsigned as well.
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Fixed some misleading indentation (Krishnaraj Bhat).
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Version 1.7.0beta80 [March 9, 2016]
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Version 1.7.0beta80 [May 5, 2016]
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Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
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Bug report by (Y.Ohashik).
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Write code update (John Bowler):
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Implemented better defaulting of zlib settings based on image properties.
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Replaced pngtest.png with one compressed with the new zlib settings.
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Implemented pass-through of png_write_rows when the rows can be used
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directly (a common case) optimizing the handling of previous-row
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buffering.
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Removed the METHODICAL filter selection method and disabled the HEURISTIC
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one. The first was ridiculously slow (though useful for experiments),
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and the second didn't work. Filter selection is temporarily disabled (it
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defaults to the lowest numbered filter in the list; typically 'none').
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New handling of compression settings (incomplete), new PNG compression level
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(not yet visible in an API).
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Back ported 'PNG_FAST_FILTERS' from 1.6 (in png.h).
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There are minimal API changes beyond removal of the selection options.
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Work is still to be done to investigate a filter selection mechanism that
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is at least as good as the previous one.
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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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20
CHANGES
20
CHANGES
@ -5564,7 +5564,25 @@ Version 1.7.0beta79 [March 9, 2016]
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(Robert C. Seacord). Various other flags in png.h made unsigned as well.
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Fixed some misleading indentation (Krishnaraj Bhat).
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Version 1.7.0beta80 [March 9, 2016]
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Version 1.7.0beta80 [May 5, 2016]
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Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
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Bug report by (Y.Ohashik).
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Write code update (John Bowler):
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Implemented better defaulting of zlib settings based on image properties.
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Replaced pngtest.png with one compressed with the new zlib settings.
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Implemented pass-through of png_write_rows when the rows can be used
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directly (a common case) optimizing the handling of previous-row
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buffering.
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Removed the METHODICAL filter selection method and disabled the HEURISTIC
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one. The first was ridiculously slow (though useful for experiments),
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and the second didn't work. Filter selection is temporarily disabled (it
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defaults to the lowest numbered filter in the list; typically 'none').
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New handling of compression settings (incomplete), new PNG compression level
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(not yet visible in an API).
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Back ported 'PNG_FAST_FILTERS' from 1.6 (in png.h).
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There are minimal API changes beyond removal of the selection options.
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Work is still to be done to investigate a filter selection mechanism that
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is at least as good as the previous one.
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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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12
png.h
12
png.h
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/* png.h - header file for PNG reference library
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*
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* libpng version 1.7.0beta80, March 9, 2016
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* libpng version 1.7.0beta80, May 5, 2016
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*
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* Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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@ -12,7 +12,7 @@
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* Authors and maintainers:
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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* libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
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* libpng versions 0.97, January 1998, through 1.7.0beta80, March 9, 2016:
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* libpng versions 0.97, January 1998, through 1.7.0beta80, May 5, 2016:
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* Glenn Randers-Pehrson.
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* See also "Contributing Authors", below.
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*/
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@ -25,7 +25,7 @@
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*
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* This code is released under the libpng license.
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*
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* libpng versions 1.0.7, July 1, 2000, through 1.7.0beta80, March 9, 2016, are
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* libpng versions 1.0.7, July 1, 2000, through 1.7.0beta80, May 5, 2016, are
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* Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
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* derived from libpng-1.0.6, and are distributed according to the same
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* disclaimer and license as libpng-1.0.6 with the following individuals
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@ -218,7 +218,7 @@
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* Y2K compliance in libpng:
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* =========================
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*
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* March 9, 2016
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* May 5, 2016
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*
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* Since the PNG Development group is an ad-hoc body, we can't make
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* an official declaration.
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@ -288,7 +288,7 @@
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/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.7.0beta80"
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#define PNG_HEADER_VERSION_STRING \
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" libpng version 1.7.0beta80 - March 9, 2016\n"
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" libpng version 1.7.0beta80 - May 5, 2016\n"
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#define PNG_LIBPNG_VER_SONUM 17
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#define PNG_LIBPNG_VER_DLLNUM 17
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@ -1533,7 +1533,7 @@ PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr));
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#endif
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#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
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#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
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#define PNG_READ_16_TO_8_SUPPORTED /* Name prior to 1.5.4 */
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/* Strip the second byte of information from a 16-bit depth file. */
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PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr));
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#endif
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@ -1,7 +1,7 @@
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/* pngconf.h - machine configurable file for libpng
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*
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* libpng version 1.7.0beta80, March 9, 2016
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* libpng version 1.7.0beta80, May 5, 2016
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*
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* Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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@ -3341,7 +3341,7 @@ huffman_metric(png_byte prefix, png_const_bytep data, size_t length)
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* Huffman code length limit of 15, so any symbol must occupy at least
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* 1/32768 of the code space. Zlib also shows some unexpected behavior with
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* window size increases; data compression can decrease, leading me (JB
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* 20160202) to hypothesise that the addition of extra, infrequently used,
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* 20160202) to hypothesize that the addition of extra, infrequently used,
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* zlib length codes damages the overall compression by reducing the
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* efficiency of the Huffman coding.
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*
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