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File name : ImageMagick.php

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<?php

namespace WebPConvert\Convert\Converters;

use ExecWithFallback\ExecWithFallback;
use LocateBinaries\LocateBinaries;

use WebPConvert\Convert\Converters\AbstractConverter;
use WebPConvert\Convert\Converters\ConverterTraits\ExecTrait;
use WebPConvert\Convert\Converters\ConverterTraits\EncodingAutoTrait;
use WebPConvert\Convert\Exceptions\ConversionFailed\ConverterNotOperational\SystemRequirementsNotMetException;
use WebPConvert\Convert\Exceptions\ConversionFailedException;
use WebPConvert\Options\OptionFactory;

//use WebPConvert\Convert\Exceptions\ConversionFailed\InvalidInput\TargetNotFoundException;

/**
 * Convert images to webp by calling imagemagick binary.
 *
 * @package    WebPConvert
 * @author     Bjørn Rosell <it@rosell.dk>
 * @since      Class available since Release 2.0.0
 */
class ImageMagick extends AbstractConverter
{
    use ExecTrait;
    use EncodingAutoTrait;

protected function getUnsupportedDefaultOptions()
    {
        return [
            'size-in-percentage',
        ];
    }

/**
     *  Get the options unique for this converter
     *
     * @return  array  Array of options
     */
    public function getUniqueOptions($imageType)
    {
        return OptionFactory::createOptions([
            self::niceOption(),
            ['try-common-system-paths', 'boolean', [
                'title' => 'Try locating ImageMagick in common system paths',
                'description' =>
                    'If set, the converter will look for a ImageMagick binaries residing in common system locations ' .
                    'such as "/usr/bin/convert". ' .
                    'If such exist, it is assumed that they are valid ImageMagick binaries. ',
                'default' => true,
                'ui' => [
                    'component' => 'checkbox',
                    'advanced' => true
                ]
            ]],
        ]);
    }

// To futher improve this converter, I could check out:
    // https://github.com/Orbitale/ImageMagickPHP

private function getPath()
    {
        if (defined('WEBPCONVERT_IMAGEMAGICK_PATH')) {
            return constant('WEBPCONVERT_IMAGEMAGICK_PATH');
        }
        if (!empty(getenv('WEBPCONVERT_IMAGEMAGICK_PATH'))) {
            return getenv('WEBPCONVERT_IMAGEMAGICK_PATH');
        }

if ($this->options['try-common-system-paths']) {
            $binaries = LocateBinaries::locateInCommonSystemPaths('convert');
            if (!empty($binaries)) {
                return $binaries[0];
            }
        }

return 'convert';
    }

private function getVersion()
    {
        ExecWithFallback::exec($this->getPath() . ' -version 2>&1', $output, $returnCode);
        if (($returnCode == 0) && isset($output[0])) {
            return $output[0];
        } else {
            return 'unknown';
        }
    }

public function isInstalled()
    {
        ExecWithFallback::exec($this->getPath() . ' -version 2>&1', $output, $returnCode);
        return ($returnCode == 0);
    }

// Check if webp delegate is installed
    public function isWebPDelegateInstalled()
    {
        ExecWithFallback::exec($this->getPath() . ' -list delegate 2>&1', $output, $returnCode);
        foreach ($output as $line) {
            if (preg_match('#webp\\s*=#i', $line)) {
                return true;
            }
        }

// try other command
        ExecWithFallback::exec($this->getPath() . ' -list configure 2>&1', $output, $returnCode);
        foreach ($output as $line) {
            if (preg_match('#DELEGATE.*webp#i', $line)) {
                return true;
            }
        }

return false;

// PS, convert -version does not output delegates on travis, so it is not reliable
    }

/**
     * Check (general) operationality of imagack converter executable
     *
     * @throws SystemRequirementsNotMetException  if system requirements are not met
     */
    public function checkOperationality()
    {
        $this->checkOperationalityExecTrait();

if (!$this->isInstalled()) {
            throw new SystemRequirementsNotMetException(
                'imagemagick is not installed (cannot execute: "' . $this->getPath() . '")'
            );
        }
        if (!$this->isWebPDelegateInstalled()) {
            throw new SystemRequirementsNotMetException('webp delegate missing');
        }
    }

/**
     * Build command line options
     *
     * @param  string $versionNumber. Ie "6.9.10-23"
     * @return string
     */
    private function createCommandLineOptions($versionNumber = 'unknown')
    {
        // Available webp options for imagemagick are documented here:
        // - https://imagemagick.org/script/webp.php
        // - https://github.com/ImageMagick/ImageMagick/blob/main/coders/webp.c

// We should perhaps implement low-memory. Its already in cwebp, it
        // could perhaps be promoted to a general option

$commandArguments = [];
        if ($this->isQualityDetectionRequiredButFailing()) {
            // quality:auto was specified, but could not be determined.
            // we cannot apply the max-quality logic, but we can provide auto quality
            // simply by not specifying the quality option.
        } else {
            $commandArguments[] = '-quality ' . escapeshellarg($this->getCalculatedQuality());
        }

$options = $this->options;

if (!is_null($options['preset'])) {
            // "image-hint" is at least available from 6.9.4-0 (I can't see further back)
            if ($options['preset'] != 'none') {
                $imageHint = $options['preset'];
                switch ($imageHint) {
                    case 'drawing':
                    case 'icon':
                    case 'text':
                        $imageHint = 'graph';
                        $this->logLn(
                            'The "preset" value was mapped to "graph" because imagemagick does not support "drawing",' .
                            ' "icon" and "text", but grouped these into one option: "graph".'
                        );
                }
                $commandArguments[] = '-define webp:image-hint=' . escapeshellarg($imageHint);
            }
        }

if ($options['encoding'] == 'lossless') {
            // lossless is at least available from 6.9.4-0 (I can't see further back)
            $commandArguments[] = '-define webp:lossless=true';
        }

if ($options['low-memory']) {
            // low-memory is at least available from 6.9.4-0 (I can't see further back)
            $commandArguments[] = '-define webp:low-memory=true';
        }

if ($options['auto-filter'] === true) {
            // auto-filter is at least available from 6.9.4-0 (I can't see further back)
            $commandArguments[] = '-define webp:auto-filter=true';
        }

if ($options['metadata'] == 'none') {
            $commandArguments[] = '-strip';
        }

if ($options['alpha-quality'] !== 100) {
            // alpha-quality is at least available from 6.9.4-0 (I can't see further back)
            $commandArguments[] = '-define webp:alpha-quality=' . strval($options['alpha-quality']);
        }

if ($options['sharp-yuv'] === true) {
            if (version_compare($versionNumber, '7.0.8-26', '>=')) {
                $commandArguments[] = '-define webp:use-sharp-yuv=true';
            } else {
                $this->logLn(
                    'Note: "sharp-yuv" option is not supported in your version of ImageMagick. ' .
                        'ImageMagic >= 7.0.8-26 is required',
                    'italic'
                );
            }
        }

if ($options['near-lossless'] != 100) {
            if (version_compare($versionNumber, '7.0.10-54', '>=')) { // #299
                $commandArguments[] = '-define webp:near-lossless=' . escapeshellarg($options['near-lossless']);
            } else {
                $this->logLn(
                    'Note: "near-lossless" option is not supported in your version of ImageMagick. ' .
                        'ImageMagic >= 7.0.10-54 is required',
                    'italic'
                );
            }
        }

// "method" is at least available from 6.9.4-0 (I can't see further back)
        $commandArguments[] = '-define webp:method=' . $options['method'];

$commandArguments[] = escapeshellarg($this->source);
        $commandArguments[] = escapeshellarg('webp:' . $this->destination);

return implode(' ', $commandArguments);
    }

protected function doActualConvert()
    {
        $version = $this->getVersion();

$this->logLn($version);

preg_match('#\d+\.\d+\.\d+[\d\.\-]+#', $version, $matches);
        $versionNumber = (isset($matches[0]) ? $matches[0] : 'unknown');

$this->logLn('Extracted version number: ' . $versionNumber);

$command = $this->getPath() . ' ' . $this->createCommandLineOptions($versionNumber) . ' 2>&1';

$useNice = ($this->options['use-nice'] && $this->checkNiceSupport());
        if ($useNice) {
            $command = 'nice ' . $command;
        }
        $this->logLn('Executing command: ' . $command);
        ExecWithFallback::exec($command, $output, $returnCode);

$this->logExecOutput($output);
        if ($returnCode == 0) {
            $this->logLn('success');
        } else {
            $this->logLn('return code: ' . $returnCode);
        }

if ($returnCode == 127) {
            throw new SystemRequirementsNotMetException('imagemagick is not installed');
        }
        if ($returnCode != 0) {
            throw new SystemRequirementsNotMetException('The exec call failed');
        }
    }
}

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