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[libpng16] Delay calling png_init_filter_functions() until a row with nonzero

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filter is found.
This commit is contained in:
Glenn Randers-Pehrson
2013-08-20 21:15:31 -05:00
parent 52083f9152
commit 685d79e27a
3 changed files with 13 additions and 6 deletions
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9
pngrutil.c
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@@ -1,7 +1,7 @@
/* pngrutil.c - utilities to read a PNG file
*
* Last changed in libpng 1.6.3 [July 18, 2013]
* Last changed in libpng 1.6.4 [(PENDING RELEASE)]
* Copyright (c) 1998-2013 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.)
@@ -3922,10 +3922,13 @@ png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row,
* PNG_FILTER_OPTIMIZATIONS to a function that overrides the generic
* implementations. See png_init_filter_functions above.
*/
if (pp->read_filter[0] == NULL)
png_init_filter_functions(pp);
if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST)
{
if (pp->read_filter[0] == NULL)
png_init_filter_functions(pp);
pp->read_filter[filter-1](row_info, row, prev_row);
}
}
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED