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[libpng17] Made default Zlib compression settings be configurable. This adds #defines to

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pnglibconf.h to control the defaults.
This commit is contained in:
John Bowler
2012-12-20 22:16:51 -06:00
committed by Glenn Randers-Pehrson
parent 5a0afcfa63
commit e699993d70
6 changed files with 205 additions and 174 deletions
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18
scripts/pnglibconf.dfa
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@@ -203,6 +203,24 @@ setting ZLIB_PREFIX
setting ZLIB_HEADER default <zlib.h>
# These settings configure the default compression level (0-9) and 'strategy';
# strategy is as defined by the implementors of zlib, it describes the input
# data and modifies the zlib parameters in an attempt to optimize the balance
# between search and huffman encoding in the zlib algorithms. The defaults are
# the zlib.h defaults - the apparently recursive definition does not arise
# because the name of the setting is prefixed by PNG_
#
# The TEXT values are the defaults when writing compressed text (all forms)
setting Z_DEFAULT_COMPRESSION default Z_DEFAULT_COMPRESSION
# TODO: why aren't these Z_RLE; zlib.h says that Z_RLE, specifically, is
# appropriate for PNG images, maybe it doesn't exist in all versions?
setting Z_DEFAULT_STRATEGY default Z_FILTERED
setting Z_DEFAULT_NOFILTER_STRATEGY default Z_DEFAULT_STRATEGY
setting TEXT_Z_DEFAULT_COMPRESSION default Z_DEFAULT_COMPRESSION
setting TEXT_Z_DEFAULT_STRATEGY default Z_DEFAULT_STRATEGY
# Define this to something that will stop, at least, the current thread; control
# cannot proceed beyond the PNG_ABORT operation and compilation of pngerror.c is
# likely to fail if the operation implemented does not clearly terminate the