core-bundle/src/Image/ImageFactory.php
public function getImportantPartFromLegacyMode(ImageInterface $image, $mode): ImportantPartInterface
    {
        if (1 !== substr_count($mode, '_')) {
            throw new \InvalidArgumentException(sprintf('"%s" is not a legacy resize mode', $mode));
        }

        $importantPart = [
            0,
            0,
            $image->getDimensions()->getSize()->getWidth(),
            $image->getDimensions()->getSize()->getHeight(),
        ];

        [$modeX, $modeY] = explode('_', $mode);

        if ('left' === $modeX) {
            $importantPart[2] = 1;
        } elseif ('right' === $modeX) {
            $importantPart[0] = $importantPart[2] - 1;
            $importantPart[2] = 1;
        }

        if ('top' === $modeY) {
            $importantPart[3] = 1;
        } elseif ('bottom' === $modeY) {
            $importantPart[1] = $importantPart[3] - 1;
            $importantPart[3] = 1;
        }

        return new ImportantPart(
            new Point($importantPart[0], $importantPart[1]),
            new Box($importantPart[2], $importantPart[3])
        );
    }
public function getImportantPartFromLegacyMode(ImageInterface $image, $mode): ImportantPartInterface
    {
        if (1 !== substr_count($mode, '_')) {
            throw new \InvalidArgumentException(sprintf('"%s" is not a legacy resize mode', $mode));
        }

        $importantPart = [
            0,
            0,
            $image->getDimensions()->getSize()->getWidth(),
            $image->getDimensions()->getSize()->getHeight(),
        ];

        [$modeX, $modeY] = explode('_', $mode);

        if ('left' === $modeX) {
            $importantPart[2] = 1;
        } elseif ('right' === $modeX) {
            $importantPart[0] = $importantPart[2] - 1;
            $importantPart[2] = 1;
        }

        if ('top' === $modeY) {
            $importantPart[3] = 1;
        } elseif ('bottom' === $modeY) {
            $importantPart[1] = $importantPart[3] - 1;
            $importantPart[3] = 1;
        }

        return new ImportantPart(
            new Point($importantPart[0], $importantPart[1]),
            new Box($importantPart[2], $importantPart[3])
        );
    }
{@inheritdoc}