38 lines
1.1 KiB
Bash
38 lines
1.1 KiB
Bash
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#!/bin/sh
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# Crop one image into another, after first checking that the source
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# image has the expected size in pixels.
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#
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# This is used in the Puzzles icon build scripts to construct icons
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# which are zoomed in on a particular sub-area of the puzzle's
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# basic screenshot. This way I can define crop areas in pixels,
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# while not having to worry too much that if I adjust the source
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# puzzle so as to alter the layout the crop area might start
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# hitting the wrong bit of picture. Most layout changes I can
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# conveniently imagine will also alter the overall image size, so
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# this script will give a build error and alert me to the fact that
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# I need to fiddle with the icon makefile.
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infile="$1"
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outfile="$2"
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insize="$3"
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crop="$4"
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# Special case: if no input size or crop parameter was specified at
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# all, we just copy the input to the output file.
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if test $# -lt 3; then
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cp "$infile" "$outfile"
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exit 0
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fi
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# Check the input image size.
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realsize=`identify -format %wx%h "$infile"`
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if test "x$insize" != "x$realsize"; then
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echo "crop.sh: '$infile' has wrong initial size: $realsize != $insize" >&2
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exit 1
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fi
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# And crop.
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convert -crop "$crop" "$infile" "$outfile"
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