icons/crop.sh

   1 #!/bin/sh
   2
   3 # Crop one image into another, after first checking that the source
   4 # image has the expected size in pixels.
   5 #
   6 # This is used in the Puzzles icon build scripts to construct icons
   7 # which are zoomed in on a particular sub-area of the puzzle's
   8 # basic screenshot. This way I can define crop areas in pixels,
   9 # while not having to worry too much that if I adjust the source
  10 # puzzle so as to alter the layout the crop area might start
  11 # hitting the wrong bit of picture. Most layout changes I can
  12 # conveniently imagine will also alter the overall image size, so
  13 # this script will give a build error and alert me to the fact that
  14 # I need to fiddle with the icon makefile.
  15
  16 infile="$1"
  17 outfile="$2"
  18 insize="$3"
  19 crop="$4"
  20
  21 # Special case: if no input size or crop parameter was specified at
  22 # all, we just copy the input to the output file.
  23
  24 if test $# -lt 3; then
  25   cp "$infile" "$outfile"
  26   exit 0
  27 fi
  28
  29 # Check the input image size.
  30 realsize=`identify -format %wx%h "$infile"`
  31 if test "x$insize" != "x$realsize"; then
  32   echo "crop.sh: '$infile' has wrong initial size: $realsize != $insize" >&2
  33   exit 1
  34 fi
  35
  36 # And crop.
  37 convert -crop "$crop" "$infile" "$outfile"