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