test/pamenlarge-pbm.test


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#! /bin/bash
# This script tests: pamenlarge
# Also requires: pbmmake pnmpad

tmpdir=${tmpdir:-/tmp}
complete256_pbm=${tmpdir}/complete256.pbm

# works with gawk and mawk
# produce all possible 8-bit patterns

LC_ALL=C awk 'BEGIN { print "P4";         # header
                      print "8 256";
                      for (i=0;i<256;++i) # raster
                           printf("%c",i) }' > ${complete256_pbm}

# xscale factor should be tested to at least 21 (=13+8)

# Test 1.
echo "test 1"
 
for xs in `seq 23`
  do
  pamenlarge -xscale=$xs ${complete256_pbm} | cksum
  done

# Test 2.
echo "test 2"

for xs1 in `seq 15`
  do
  xs2=$((30-$xs1))
  pamenlarge -xscale=$xs1 ${complete256_pbm} | pamenlarge -xscale=$xs2 | cksum
  if [ $xs1 != $xs2 ]; then
  pamenlarge -xscale=$xs2 ${complete256_pbm} | pamenlarge -xscale=$xs1 | cksum
  fi
  pamenlarge -xscale=$(($xs1 * $xs2)) ${complete256_pbm} | cksum
  done

rm ${complete256_pbm}

# Test 3.
echo "test 3"

test3_pbm=${tmpdir}/test3.pbm

for width in `seq 16`
  do
  pbmmake -g ${width} 1 | pnmpad -top=1 -white | \
      pnmpad -bottom=1 -black > ${test3_pbm}.${width}
  done
 
  for xscale in `seq 16`
    do echo -n ${xscale} " "
    for width in `seq 16`
      do pamenlarge -xscale=${xscale} ${test3_pbm}.${width} ; done | cksum
      #
      # unlike most other tests we take the cksum of a composite PBM file
      #
    done

rm ${test3_pbm}.[1-9]  ${test3_pbm}.1[1-6]