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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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/** @param bool */ |
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define('PHPWEBP_GD_PNG', false); |
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/** |
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* Class Gd |
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* |
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* Converts an image to WebP via GD Graphics (Draw) |
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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 Gd 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('gd')) { |
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throw new Exception('Required GD extension is not available.'); |
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} |
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if (!function_exists('imagewebp')) { |
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throw new Exception('Required imagewebp() function is not available.'); |
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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|resource |
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*/ |
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public function convert() |
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{ |
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try { |
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$this->checkRequirements(); |
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switch ($this->extension) { |
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case 'png': |
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if (defined('PHPWEBP_GD_PNG') && PHPWEBP_GD_PNG) { |
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return imagecreatefrompng($this->source); |
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} else { |
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throw new Exception('PNG file conversion failed.'); |
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} |
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break; |
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default: |
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$image = imagecreatefromjpeg($this->source); |
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} |
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// Checks if either imagecreatefromjpeg() or imagecreatefrompng() returned false |
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if ($image === false) { |
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throw new Exception('Either imagecreatefromjpeg or imagecreatefrompng failed'); |
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} |
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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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return $this->toImage($image); |
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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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$success = imagewebp($image, $this->destination, $this->quality); |
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/* |
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* This hack solves an `imagewebp` bug |
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* See https://stackoverflow.com/questions/30078090/imagewebp-php-creates-corrupted-webp-files |
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* |
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*/ |
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if (filesize($this->destination) % 2 == 1) { |
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file_put_contents($this->destination, "\0", FILE_APPEND); |
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} |
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imagedestroy($image); |
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return $success; |
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} |
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} |
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whallysson /
conveter-php-webp
