Some quick hacks that do the seamless texture splits.
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Zed A. Shaw
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magick/splitcrop
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magick/splitcrop
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#!/bin/bash
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#
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# Developed by Fred Weinhaus revised 6/9/2012 .......... revised 4/25/2015
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#
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# ------------------------------------------------------------------------------
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#
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# Licensing:
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#
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# Copyright © Fred Weinhaus
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#
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# My scripts are available free of charge for non-commercial use, ONLY.
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#
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# For use of my scripts in commercial (for-profit) environments or
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# non-free applications, please contact me (Fred Weinhaus) for
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# licensing arrangements. My email address is fmw at alink dot net.
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#
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# If you: 1) redistribute, 2) incorporate any of these scripts into other
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# free applications or 3) reprogram them in another scripting language,
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# then you must contact me for permission, especially if the result might
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# be used in a commercial or for-profit environment.
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#
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# My scripts are also subject, in a subordinate manner, to the ImageMagick
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# license, which can be found at: http://www.imagemagick.org/script/license.php
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#
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# ------------------------------------------------------------------------------
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#
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####
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#
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# USAGE: splitcrop [-x xcoord] [-y ycoord] [-L] infile [outfile]
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# USAGE: splitcrop [-h or -help]
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#
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# OPTIONS:
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#
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# -x xcoord x coordinate for split; 0<integer<width; default=center
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# -y xcoord y coordinate for split; 0<integer<height; default=center
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# -L list crop dimensions and offsets to the terminal
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#
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# Note, the output images will be named automatically from the outfile name and
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# suffix. Two or four of the following: _left, _right, _top, _bottom,
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# _topleft, _topright, _bottomleft, _bottomright will be appended before the
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# suffix. If no outfile is provided, then the infile name and suffix will be
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# used for the output.
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#
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###
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#
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# NAME: SPLITCROP
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#
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# PURPOSE: To crop an image into two or four sections according to the given
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# x,y coordinates.
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#
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# DESCRIPTION: SPLITCROP crops an image into two or four sections according to
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# the given x,y coordinates. One or both of the x,y coordinates may be
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# specified. If one coordinate is specified, then the image will be split into
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# two parts. If two coordinate are specified, then the image will be split both
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# ways into four parts. Note that these are coordinates and not sizes. The top,
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# left or topleft section will include the coordinate specified. The size of
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# the split will be the coordinate plus 1. If the image dimension is odd,
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# then the top, left or topleft will contain the extra pixel(s).
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#
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# OPTIONS:
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#
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# -x xcoord ... XCOORD is the x coordinate for the split. Values are
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# 0<integers<width. The default=center of image
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#
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# -y ycoord ... YCOORD is the y coordinate for the split. Values are
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# 0<integers<height. The default=center of image
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#
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# -L ... LIST crop dimensions and offsets to the terminal
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#
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# CAVEAT: No guarantee that this script will work on all platforms,
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# nor that trapping of inconsistent parameters is complete and
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# foolproof. Use At Your Own Risk.
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#
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######
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#
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# set default values
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xcoord="" # x coordinate for split
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ycoord="" # y coordinate for split
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list="off"
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# set directory for temporary files
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dir="." # suggestions are dir="." or dir="/tmp"
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# set up functions to report Usage and Usage with Description
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PROGNAME="splitcrop" # search for executable on path
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PROGDIR=`dirname $PROGNAME` # extract directory of program
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PROGNAME=`basename $PROGNAME` # base name of program
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usage1()
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{
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echo >&2 ""
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echo >&2 "$PROGNAME:" "$@"
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sed >&2 -e '1,/^####/d; /^###/g; /^#/!q; s/^#//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME"
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}
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usage2()
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{
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echo >&2 ""
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echo >&2 "$PROGNAME:" "$@"
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sed >&2 -e '1,/^####/d; /^######/g; /^#/!q; s/^#*//; s/^ //; 4,$p' "$PROGDIR/$PROGNAME"
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}
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# function to report error messages
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errMsg()
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{
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echo ""
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echo $1
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echo ""
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usage1
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exit 1
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}
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# function to test for minus at start of value of second part of option 1 or 2
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checkMinus()
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{
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test=`echo "$1" | grep -c '^-.*$'` # returns 1 if match; 0 otherwise
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[ $test -eq 1 ] && errMsg "$errorMsg"
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}
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# test for correct number of arguments and get values
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if [ $# -eq 0 ]
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then
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# help information
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echo ""
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usage2
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exit 0
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elif [ $# -gt 6 ]
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then
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errMsg "--- TOO MANY ARGUMENTS WERE PROVIDED ---"
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else
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while [ $# -gt 0 ]
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do
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# get parameter values
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case "$1" in
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-h|-help) # help information
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echo ""
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usage2
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exit 0
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;;
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-x) # get xcoord
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shift # to get the next parameter
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# test if parameter starts with minus sign
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errorMsg="--- INVALID XCOORD SPECIFICATION ---"
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checkMinus "$1"
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xcoord=`expr "$1" : '\([0-9]*\)'`
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[ "$xcoord" = "" ] && errMsg "--- XCOORD=$xcoord MUST BE A NON-NEGATIVE INTEGER ---"
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;;
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-y) # get ycoord
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shift # to get the neyt parameter
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# test if parameter starts with minus sign
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errorMsg="--- INVALID YCOORD SPECIFICATION ---"
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checkMinus "$1"
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ycoord=`expr "$1" : '\([0-9]*\)'`
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[ "$ycoord" = "" ] && errMsg "--- YCOORD=$ycoord MUST BE A NON-NEGATIVE INTEGER ---"
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;;
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-L) # get list
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list="on"
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;;
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-) # STDIN and end of arguments
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break
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;;
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-*) # any other - argument
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errMsg "--- UNKNOWN OPTION ---"
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;;
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*) # end of arguments
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break
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;;
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esac
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shift # next option
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done
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#
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# get infile and outfile
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infile="$1"
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outfile="$2"
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fi
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# test that infile provided
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[ "$infile" = "" ] && errMsg "NO INPUT FILE SPECIFIED"
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# test that outfile provided
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if [ "$outfile" = "" ]; then
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# separate infile to outname and suffix
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outname=`echo "$infile" | sed -n 's/^\(.*\)[\.].*$/\1/p'`
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suffix=`echo "$infile" | sed -n 's/^.*[\.]\(.*\)$/\1/p'`
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else
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# separate outfile to outname and suffix
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outname=`echo "$outfile" | sed -n 's/^\(.*\)[\.].*$/\1/p'`
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suffix=`echo "$outfile" | sed -n 's/^.*[\.]\(.*\)$/\1/p'`
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fi
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# setup temporary images
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tmpA1="$dir/split_A_$$.mpc"
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tmpA2="$dir/split_A_$$.cache"
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trap "rm -f $tmpA1 $tmpA2;" 0
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trap "rm -f $tmpA1 $tmpA2; exit 1" 1 2 3 15
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trap "rm -f $tmpA1 $tmpA2; exit 1" ERR
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# read the input image into the temporary cached image and test if valid
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convert -quiet "$infile" +repage "$tmpA1" ||
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errMsg "--- FILE $infile DOES NOT EXIST OR IS NOT AN ORDINARY FILE, NOT READABLE OR HAS ZERO size ---"
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# get input dimensions
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ww=`convert $tmpA1 -format "%w" info:`
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hh=`convert $tmpA1 -format "%h" info:`
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#echo "ww=$ww; hh=$hh"
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x=$xcoord
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y=$ycoord
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# trap for no coordinates specified
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if [ "$x" = "" -a "$y" = "" ]; then
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x=`convert xc: -format "%[fx:round($ww/2)-1]" info:`
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y=`convert xc: -format "%[fx:round($hh/2)-1]" info:`
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fi
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# trap for coordinates at boundary or outside image
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if [ "$x" != "" ]; then
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( [ $x -eq 0 ] || [ $x -ge $ww ] ) && errMsg "--- INVALID X COORDINATE SPECIFIED ---"
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fi
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if [ "$y" != "" ]; then
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( [ $y -eq 0 ] || [ $y -ge $ww ] ) && errMsg "--- INVALID Y COORDINATE SPECIFIED ---"
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fi
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# options depending upon whether x or y or (x and y) specified
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if [ "$x" != "" -a "$y" != "" ]; then
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#split into four parts
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tlsize=`convert xc: -format "%[fx:$x+1]x%[fx:$y+1]+0+0" info:`
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trsize=`convert xc: -format "%[fx:$ww-$x-1]x%[fx:$y+1]+%[fx:$x+1]+0" info:`
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blsize=`convert xc: -format "%[fx:$x+1]x%[fx:$hh-$y-1]+0+%[fx:$y+1]" info:`
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brsize=`convert xc: -format "%[fx:$ww-$x-1]x%[fx:$hh-$y-1]+%[fx:$x+1]+%[fx:$y+1]" info:`
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if [ "$list" = "on" ]; then
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echo "tlsize=$tlsize"
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echo "trsize=$trsize"
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echo "blsize=$blsize"
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echo "brsize=$brsize"
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fi
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convert $tmpA1 -crop $tlsize +repage "${outname}_topleft.$suffix"
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convert $tmpA1 -crop $trsize +repage "${outname}_topright.$suffix"
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convert $tmpA1 -crop $blsize +repage "${outname}_bottomleft.$suffix"
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convert $tmpA1 -crop $brsize +repage "${outname}_bottomright.$suffix"
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elif [ "$x" != "" ]; then
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#split into two parts horizontally
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lsize=`convert xc: -format "%[fx:$x+1]x${hh}+0+0" info:`
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rsize=`convert xc: -format "%[fx:$ww-$x-1]x${hh}+%[fx:$x+1]+0" info:`
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if [ "$list" = "on" ]; then
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echo "lsize=$lsize"
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echo "rsize=$rsize"
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fi
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convert $tmpA1 -crop $lsize +repage "${outname}_left.$suffix"
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convert $tmpA1 -crop $rsize +repage "${outname}_right.$suffix"
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elif [ "$y" != "" ]; then
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#split into two parts vertically
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tsize=`convert xc: -format "${ww}x%[fx:$y+1]+0+0" info:`
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bsize=`convert xc: -format "${ww}x%[fx:$hh-$y-1]+0+%[fx:$y+1]" info:`
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if [ "$list" = "on" ]; then
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echo "tsize=$tsize"
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echo "bsize=$bsize"
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fi
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convert $tmpA1 -crop $tsize +repage "${outname}_top.$suffix"
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convert $tmpA1 -crop $bsize +repage "${outname}_bottom.$suffix"
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fi
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exit 0
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