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<?php |
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namespace Jackal\ImageMerge\Model\Format; |
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use Exception; |
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use Jackal\ImageMerge\Model\File\FileObjectInterface; |
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/** |
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* Class ImageReader |
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* @package Jackal\ImageMerge\Model\Format |
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*/ |
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final class ImageReader |
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{ |
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const FORMAT_JPG = 'jpg'; |
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const FORMAT_PNG = 'png'; |
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const FORMAT_GIF = 'gif'; |
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const FORMAT_WEBP = 'webp'; |
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private $resource; |
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private $format; |
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private function __construct() |
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{ |
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//IMAGETYPE_WEBP is available only from php 7.1 |
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if (!defined('IMAGETYPE_WEBP')) { |
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define('IMAGETYPE_WEBP', 18); |
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} |
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} |
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/** |
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* @param FileObjectInterface $filename |
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* @return ImageReader |
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* @throws Exception |
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*/ |
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public static function fromPathname(FileObjectInterface $filename) |
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{ |
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$ir = new self(); |
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$ir->resource = @imagecreatefromstring($filename->getContents()); |
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switch ($ir->getExifType($filename)) { |
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case IMAGETYPE_PNG:{ |
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$ir->format = self::FORMAT_PNG; |
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break; |
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} |
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case IMAGETYPE_JPEG:{ |
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$ir->format = self::FORMAT_JPG; |
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break; |
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} |
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case IMAGETYPE_GIF:{ |
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$ir->format = self::FORMAT_GIF; |
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break; |
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} |
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case IMAGETYPE_WEBP:{ |
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$ir->format = self::FORMAT_WEBP; |
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break; |
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} |
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default: { |
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throw new Exception(sprintf('File is not a valid image type [extension: "%s"]', |
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$ir->getExtension($filename)) |
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); |
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} |
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} |
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return $ir; |
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} |
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private function getExtension(FileObjectInterface $filename) |
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{ |
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return strtolower(pathinfo($filename->getPathname(), PATHINFO_EXTENSION)); |
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} |
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private function getExifType(FileObjectInterface $filename) |
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{ |
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$imageType = exif_imagetype($filename->getPathname()); |
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if (!$imageType) { |
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//since IMAGETYPE_WEBP is available only from php 7.1, we guess the type base from the extension |
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if (version_compare(PHP_VERSION, '7.1.0', '<') and $this->getExtension($filename) == 'webp') { |
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return IMAGETYPE_WEBP; |
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} |
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} |
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return $imageType; |
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} |
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/** |
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* @return string |
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*/ |
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public function getFormat() |
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{ |
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return $this->format; |
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} |
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/** |
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* @return resource |
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*/ |
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public function getResource() |
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{ |
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return $this->resource; |
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} |
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} |
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lucajackal85 /
ImageMerge
