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[devel] Avoid some tests while selecting a filter.

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The AVG and PAETH filters will never be selected for the first
row, so we need not test them.
This commit is contained in:
Glenn Randers-Pehrson
2009-07-18 11:28:33 -05:00
parent ee100094e4
commit ae4af5600d
3 changed files with 13 additions and 5 deletions
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10
pngwutil.c
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@@ -1,7 +1,7 @@
/* pngwutil.c - utilities to write a PNG file
*
* Last changed in libpng 1.4.0 [July 7, 2009]
* Last changed in libpng 1.4.0 [July 18, 2009]
* Copyright (c) 1998-2009 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.)
@@ -2130,7 +2130,13 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
png_uint_32 row_bytes = row_info->rowbytes;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
int num_p_filters = (int)png_ptr->num_prev_filters;
#endif
#else
if (png_ptr->row_number == 0)
{
/* These will never be selected so we need not test them. */
filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH);
}
#endif
png_debug(1, "in png_write_find_filter");
/* Find out how many bytes offset each pixel is */