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[libpng16] Added PNG_FAST_FILTERS macro (defined as

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PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP).
This commit is contained in:
Glenn Randers-Pehrson
2016-04-11 08:23:16 -05:00
parent daf2169797
commit fa551df95e
5 changed files with 48 additions and 28 deletions
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30
libpng.3
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@@ -1,4 +1,4 @@
.TH LIBPNG 3 "April 5, 2016"
.TH LIBPNG 3 "April 11, 2016"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.6.22beta05
.SH SYNOPSIS
@@ -510,7 +510,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng-manual.txt - A description on how to use and modify libpng
libpng version 1.6.22beta05 - April 5, 2016
libpng version 1.6.22beta05 - April 11, 2016
Updated and distributed by Glenn Randers-Pehrson
<glennrp at users.sourceforge.net>
Copyright (c) 1998-2016 Glenn Randers-Pehrson
@@ -521,7 +521,7 @@ libpng-manual.txt - A description on how to use and modify libpng
Based on:
libpng versions 0.97, January 1998, through 1.6.22beta05 - April 5, 2016
libpng versions 0.97, January 1998, through 1.6.22beta05 - April 11, 2016
Updated and distributed by Glenn Randers-Pehrson
Copyright (c) 1998-2016 Glenn Randers-Pehrson
@@ -3352,7 +3352,7 @@ filter types.
PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG |
PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
PNG_ALL_FILTERS);
PNG_ALL_FILTERS | PNG_FAST_FILTERS);
If an application wants to start and stop using particular filters during
compression, it should start out with all of the filters (to ensure that
@@ -4897,8 +4897,9 @@ for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is
currently only '0' in the PNG 1.2 specification. The 'filters'
parameter sets which filter(s), if any, should be used for each
scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS
to turn filtering on and off, respectively.
scanline. Possible values are PNG_ALL_FILTERS, PNG_NO_FILTERS,
or PNG_FAST_FILTERS to turn filtering on and off, or to turn on
just the fast-decoding subset of filters, respectively.
Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
@@ -4912,12 +4913,19 @@ means the first row must always be adaptively filtered, because libpng
currently does not allocate the filter buffers until png_write_row()
is called for the first time.)
filters = PNG_FILTER_NONE | PNG_FILTER_SUB
filters = PNG_NO_FILTERS;
filters = PNG_ALL_FILTERS;
filters = PNG_FAST_FILTERS;
or
filters = PNG_FILTER_NONE | PNG_FILTER_SUB |
PNG_FILTER_UP | PNG_FILTER_AVG |
PNG_FILTER_PAETH | PNG_ALL_FILTERS;
PNG_FILTER_PAETH;
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
filters);
The second parameter can also be
PNG_INTRAPIXEL_DIFFERENCING if you are
writing a PNG to be embedded in a MNG
@@ -6005,7 +6013,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.6.22beta05 - April 5, 2016:
Libpng version 1.6.22beta05 - April 11, 2016:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
@@ -6030,7 +6038,7 @@ this sentence.
This code is released under the libpng license.
libpng versions 1.0.7, July 1, 2000 through 1.6.22beta05, April 5, 2016 are
libpng versions 1.0.7, July 1, 2000 through 1.6.22beta05, April 11, 2016 are
Copyright (c) 2000-2002, 2004, 2006-2016 Glenn Randers-Pehrson, are
derived from libpng-1.0.6, and are distributed according to the same
disclaimer and license as libpng-1.0.6 with the following individuals
@@ -6155,7 +6163,7 @@ files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
Glenn Randers-Pehrson
glennrp at users.sourceforge.net
April 5, 2016
April 11, 2016
.\" end of man page