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<?php |
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namespace CodeBlog\ToWebP\Convert\Converters; |
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use CodeBlog\ToWebP\AbstractConverter; |
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use Exception; |
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/** |
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* Class Imagick |
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* |
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* Converts an image to WebP via ImageMagick |
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* |
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* @author Whallysson Avelino <https://github.com/whallysson> |
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* @package CodeBlog\ToWebP\Convert\Converters |
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*/ |
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class Imagick extends AbstractConverter |
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{ |
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/** |
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* @return bool|mixed |
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* @throws Exception |
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*/ |
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public function checkRequirements() |
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{ |
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if (!extension_loaded('imagick')) { |
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throw new Exception('Required iMagick extension is not available.'); |
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} |
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if (!class_exists('Imagick')) { |
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throw new Exception('iMagick is installed but cannot handle source file.'); |
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} |
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return true; |
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} |
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/** |
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* @return bool|mixed |
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*/ |
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public function convert() |
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{ |
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try { |
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$this->checkRequirements(); |
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$im = new \Imagick($this->source); |
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// Throws an exception if iMagick does not support WebP conversion |
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if (!in_array('WEBP', $im->queryFormats())) { |
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throw new Exception('iMagick was compiled without WebP support.'); |
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} |
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$im->setImageFormat('WEBP'); |
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} catch (Exception $e) { |
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return false; // TODO: `throw` custom \Exception $e & handle it smoothly on top-level. |
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} |
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// Apply losless compression for PNG images |
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switch ($this->extension) { |
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case 'png': |
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$im->setOption('webp:lossless', 'true'); |
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break; |
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default: |
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break; |
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} |
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return $this->toImage($im); |
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} |
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/** |
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* @param $image |
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* @return bool |
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*/ |
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private function toImage($image) |
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{ |
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/* |
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* More about iMagick's WebP options: |
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* http://www.imagemagick.org/script/webp.php |
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* https://stackoverflow.com/questions/37711492/imagemagick-specific-webp-calls-in-php |
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*/ |
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$image->setOption('webp:method', '6'); |
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$image->setOption('webp:low-memory', 'true'); |
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$image->setImageCompressionQuality($this->quality); |
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// TODO: Check out other iMagick methods, see http://php.net/manual/de/imagick.writeimage.php#114714 |
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// 1. file_put_contents($destination, $im) |
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// 2. $im->writeImage($destination) |
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$wh = fopen($this->destination, 'wb'); |
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$success = $wh !== false ? $image->writeImageFile($wh) : false; |
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// TODO: Check whether Imagick::writeImageFile returns false if conversion was unsuccessful |
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if (!$success) { return false; } |
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return true; |
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} |
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} |
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whallysson /
conveter-php-webp
