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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Convert an image (or a single page of a PDF/PostScript document) to a bitmap
# and calculate the relative root-mean-squared (L2) distance from the reference.
#
# Authors:
# Rafael Siejakowski <rs@rs-math.net>
#
# Copyright (C) 2022 Authors
#
# Released under GNU GPL v2+, read the file 'COPYING' for more information.
#
MY_LOCATION=$(dirname "$0")
source "${MY_LOCATION}/../utils/functions.sh"
ensure_command "convert"
ensure_command "compare"
ensure_command "bc"
ensure_command "cp"
OUTPUT_FILENAME="$1"
OUTPUT_PAGE="$2"
REFERENCE_FILENAME="$3"
PERCENTAGE_DIFFERENCE_ALLOWED="$4"
DPI="$5"
if [ ! -f "${OUTPUT_FILENAME}" ]
then
echo "Error: Test file '${OUTPUT_FILENAME}' not found."
exit 1
fi
if [ ! -f "${REFERENCE_FILENAME}" ]
then
echo "Error: Reference file '${REFERENCE_FILENAME}' not found."
exit 1
fi
# Convert the output file to the PNG format
CONVERSION_OPTIONS="-colorspace RGB"
# Extract a page from multipage PS/PDF if requested
OUTFILE_SUFFIX=""
if [[ "x$OUTPUT_PAGE" != "x" ]]
then
OUTFILE_SUFFIX="[${OUTPUT_PAGE}]" # Use ImageMagick's bracket operator
fi
DPI_OPTION=""
if [[ "x$DPI" != "x" ]]
then
DPI_OPTION="-density $DPI"
fi
if [[ $(identify -format "%m" "${OUTPUT_FILENAME}") != "PNG" ]]
then
if ! convert $DPI_OPTION "${OUTPUT_FILENAME}${OUTFILE_SUFFIX}" $CONVERSION_OPTIONS "${OUTPUT_FILENAME}-output.png"
then
echo "Warning: Failed to convert test file '${OUTPUT_FILENAME}' to PNG format. Skipping comparison test."
exit 42
fi
else
cp "${OUTPUT_FILENAME}" "${OUTPUT_FILENAME}-output.png"
fi
# Copy the reference file
cp "${REFERENCE_FILENAME}" "${OUTPUT_FILENAME}-reference.png"
# Compare the two files
COMPARE_OUTPUT=$(compare 2>&1 -metric RMSE "${OUTPUT_FILENAME}-output.png" "${OUTPUT_FILENAME}-reference.png" \
"${OUTPUT_FILENAME}-diff.png")
RELATIVE_ERROR=$(get_compare_result "$COMPARE_OUTPUT")
PERCENTAGE_ERROR=$(fraction_to_percentage "$RELATIVE_ERROR")
if (( $(is_relative_error_within_tolerance "$RELATIVE_ERROR" "$PERCENTAGE_DIFFERENCE_ALLOWED") ))
then
# Test passed: print stats and clean up the files.
echo "Fuzzy comparison PASSED; error of ${PERCENTAGE_ERROR}% is within ${PERCENTAGE_DIFFERENCE_ALLOWED}% tolerance."
for FILE in ${OUTPUT_FILENAME}{,-reference.png,-output.png,-diff.png}
do
rm -f "${FILE}"
done
else
# Test failed!
echo "Fuzzy comparison FAILED; error of ${PERCENTAGE_ERROR}% exceeds ${PERCENTAGE_DIFFERENCE_ALLOWED}% tolerance."
exit 1
fi
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