dist/pngcrush.sh

   1 #!/bin/bash -xe
   2 # Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 size()
   7 {
   8   stat -c %s "$@"
   9 }
  10
  11 do_apngopt()
  12 {
  13   local png new
  14
  15   for png in "$@"; do
  16     new="${png}.new"
  17     apngopt "${png}" "${new}"
  18     if [[ $(size "${png}") -gt $(size "${new}") ]]; then
  19       mv "${new}" "${png}"
  20     else
  21       rm "${new}"
  22     fi
  23   done
  24 }
  25
  26 do_pngcrush()
  27 {
  28   local png new
  29
  30   pngcrush -e .png.new "$@"
  31   for png in "$@"; do
  32     new="${png}.new"
  33     mv "${new}" "${png}"
  34   done
  35 }
  36
  37 main()
  38 {
  39   if [ $# -eq 0 ]; then
  40     set -- $(find -name '*.png')
  41   fi
  42
  43   if type -P apngopt >/dev/null; then
  44     # apngopt likes to corrupt images.
  45     : do_apngopt "$@"
  46   elif type -P pngcrush >/dev/null; then
  47     do_pngcrush "$@"
  48   else
  49     echo "error: could not find apngopt or pngcrush"
  50     exit 1
  51   fi
  52 }
  53 main "$@"