77 lines
2.1 KiB
Bash
77 lines
2.1 KiB
Bash
# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Bash functions useful for fuzzy bitmap comparisons. This file is a part of Inkscape.
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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) 2023 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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ensure_command()
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{
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command -v $1 >/dev/null 2>&1 || { echo >&2 "Required command '$1' not found. Aborting."; exit 1; }
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}
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export LANG=C # Needed to force . as the decimal separator
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ensure_command "bc"
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# Parse out the relative difference between two images from the command line output
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# of an ImageMagick compare command. In case of error, crash out of the script to ensure the test fails.
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#
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# Arguments:
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# $1 - commandline output from a compare command with RMSE metric.
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#
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# Output:
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# The parsed relative error, as a floating point number.
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#
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get_compare_result()
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{
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local COMPARE_OUTPUT="$1"
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RELATIVE_ERROR=${COMPARE_OUTPUT#*(}
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RELATIVE_ERROR=${RELATIVE_ERROR%)*}
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if [[ "x$RELATIVE_ERROR" == "x" ]]
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then
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echo "Warning: Could not parse out the relative error from ImageMagick output." >&2
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exit 42
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fi
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echo "$RELATIVE_ERROR"
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}
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# Check whether a floating point number is less than or equal to a percentage value.
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# In case of error, crash out of the script.
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#
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# Arguments:
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# $1 - a floating pointing number between 0.0 and 1.0
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# $2 - a number between 0.0 and 100.0 representing a percentage. Scientific notation not allowed.
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#
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# Output:
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# 1 if and only if $1 * 100 <= $2 else 0.
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#
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is_relative_error_within_tolerance()
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{
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local CONDITION=$(printf "%.12f * 100 <= $2" "$1")
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WITHIN_TOLERANCE=$(echo "${CONDITION}" | bc)
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if [[ $? -ne 0 || ( $WITHIN_TOLERANCE -ne 0 && $WITHIN_TOLERANCE -ne 1 ) ]]
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then
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echo "Warning: An error occurred running 'bc'." >&2
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exit 42
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fi
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echo "$WITHIN_TOLERANCE"
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}
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# Multiply a floating point number by 100.
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#
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# Arguments:
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# $1 - a floating point number.
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#
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# Output:
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# The result of multiplying the passed number by 100, rounded to 1 digit after the decimal point.
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fraction_to_percentage()
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{
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local FORMULA=$(printf "%.4f * 100" "$1")
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echo "$FORMULA" | bc
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}
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