media/libpng/1737038.patch

   1 diff --git a/pngwutil.c b/pngwutil.c
   2 --- a/pngwutil.c
   3 +++ b/pngwutil.c
   4 @@ -336,8 +336,10 @@ png_deflate_claim(png_structrp png_ptr,
   5           if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0)
   6              strategy = png_ptr->zlib_strategy;
   7
   8 +#ifdef PNG_WRITE_FILTER_SUPPORTED
   9           else if (png_ptr->do_filter != PNG_FILTER_NONE)
  10              strategy = PNG_Z_DEFAULT_STRATEGY;
  11 +#endif
  12
  13           else
  14              strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY;
  15 @@ -823,12 +825,16 @@ png_write_IHDR(png_structrp png_ptr, png
  16
  17     if ((png_ptr->do_filter) == PNG_NO_FILTERS)
  18     {
  19 +#ifdef PNG_WRITE_FILTER_SUPPORTED
  20        if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||
  21            png_ptr->bit_depth < 8)
  22           png_ptr->do_filter = PNG_FILTER_NONE;
  23
  24        else
  25           png_ptr->do_filter = PNG_ALL_FILTERS;
  26 +#else
  27 +      png_ptr->do_filter = PNG_FILTER_NONE;
  28 +#endif
  29     }
  30
  31     png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */