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#! /bin/bash
# This script tests: ppmtorgb3 rgb3toppm
# Also requires: pgmtopbm pgmtopgm ppmtopgm
# Break an image into three monochrome planes, reassemble the
# image from them and check whether the resulting output is
# identical to the original input.
tmpdir=${tmpdir:-/tmp}
# Test 1. PPM (color) input
testimg_ppm=${tmpdir}/testimg.ppm
testimg_red=${tmpdir}/testimg.red
testimg_grn=${tmpdir}/testimg.grn
testimg_blu=${tmpdir}/testimg.blu
cp testimg.ppm ${tmpdir} &&
ppmtorgb3 ${testimg_ppm} &&
rgb3toppm ${testimg_red} ${testimg_grn} ${testimg_blu} | cksum
cat ${testimg_red} ${testimg_grn} ${testimg_blu} | cksum
rm ${testimg_ppm} ${testimg_red} ${testimg_grn} ${testimg_blu}
# Test 2. PBM (monochrome) input
testgrid_pbm=${tmpdir}/testgrid.pbm
testgrid_red=${tmpdir}/testgrid.red
testgrid_grn=${tmpdir}/testgrid.grn
testgrid_blu=${tmpdir}/testgrid.blu
cp testgrid.pbm ${tmpdir} &&
ppmtorgb3 ${testgrid_pbm} &&
rgb3toppm ${testgrid_red} ${testgrid_grn} ${testgrid_blu} | \
ppmtopgm | pgmtopbm -th -val=0.5 | cksum
# Test 3.
# With PGM or PBM input, the three monochrome planes should be
# identical. Test for this.
cmp -s ${testgrid_red} ${testgrid_grn} ; echo $?
cmp -s ${testgrid_grn} ${testgrid_blu} ; echo $?
pgmtopgm < testgrid.pbm | cmp -s - ${testgrid_red}
echo ${PIPESTATUS[@]} ":" $?
rm ${testgrid_pbm} ${testgrid_red} ${testgrid_grn} ${testgrid_blu}
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