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[libpng16] Fixed old cut&paste bug in the weighted filter selection code in

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pngwutil.c, introduced in libpng-0.95, March 1997.
This commit is contained in:
Glenn Randers-Pehrson 2015-05-30 22:58:54 -05:00
parent b66de48b3b
commit 1088f4925f
3 changed files with 6 additions and 2 deletions
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2
ANNOUNCE
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@ -59,6 +59,8 @@ Version 1.6.18beta05 [May 31, 2015]
sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
to avoid confusion with the libpng private macros.
Fixed old cut&paste bug in the weighted filter selection code in
pngwutil.c, introduced in libpng-0.95, March 1997.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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2
CHANGES
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@ -5244,6 +5244,8 @@ Version 1.6.18beta05 [May 31, 2015]
sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
to avoid confusion with the libpng private macros.
Fixed old cut&paste bug in the weighted filter selection code in
pngwutil.c, introduced in libpng-0.95, March 1997.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

4
pngwutil.c
View File

@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.6.17 [March 26, 2015]
* Last changed in libpng 1.6.18 [(PENDING RELEASE)]
* Copyright (c) 1998-2015 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@ -2814,7 +2814,7 @@ png_write_find_filter(png_structrp png_ptr, png_row_infop row_info)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
{
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;