# macro: %png_fix path/to/name-of.png

#        for given png, fixes 'IDAT: invalid distance too far back', etc., 

#        see pngfix --help

#

#     -q do not output if macro fixed something or find unrecoverable error

#

#     this macro fails only if there is an unrecoverable error in the png

#     -- pngfix returns nonzero and $png.fixed doesn't exist; run pngfix

#     on that file, see return code and compare with pngfix --help output

%png_fix(q) \

  if test "x%1" == "x%%1"; then \

    echo "Missing argument in call to %%png_fix: path and name of png file." \

    exit 1 \

  fi \

  /usr/bin/pngfix %{-q: -qq} --suffix='.fixed' "%1" || true \

  mv "%1.fixed" "%1" \

  %nil

#

# macro: %png_fix_dir

#        for given directory, search *.png (recursively) and potentionaly

#        fix 'IDAT: invalid distance too far back', etc., see pngfix --help

#

#     -q do not output if pngfix fixed something or find unrecoverable error

#

%png_fix_dir(q) \

  if test "x%1" == "x%%1"; then \

    echo "Missing argument in call to %%png_fix_dir: dir where to search png files." \

    exit 1 \

  fi \

  for png in `find "%1" -iname '*.png'`; do \

    # -q will be propagated \

    %png_fix $png \

  done \

  %nil

​

​