Classes

File io/image/ImageResizer.class.php

File io/image/ImageResizer.class.php

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<?php
/**
 * This class allows you to resize images easily.
 * @package     IO
 * @subpackage  Image
 * @copyright   &copy; 2005-2019 PHPBoost
 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU/GPL-3.0
 * @author      Kevin MASSY <reidlos@phpboost.com>
 * @version     PHPBoost 5.2 - last update: 2016 10 28
 * @since       PHPBoost 3.0 - 2010 07 11
 * @contributor Julien BRISWALTER <j1.seth@phpboost.com>
 * @contributor Arnaud GENET <elenwii@phpboost.com>
*/

class ImageResizer
{
    /**
     * @throws Exception if the GD extension is not loaded
     */
    public function resize(Image $image, $width, $height, $directory = '')
    {
        $this->assert_gd_extension_is_loaded();

        $path = $this->default_path($image, $directory);

        $original_picture = $this->create_image_identifier($image);
        $new_picture = $this->create_ressource($image, $width, $height);

        imagealphablending($new_picture, false);
        imagesavealpha($new_picture, true);

        imagecopyresampled($new_picture, $original_picture, 0, 0, 0, 0, $width, $height, $image->get_width(), $image->get_height());

        $this->create_image($image, $new_picture, $path);
    }

    public function resize_with_max_values(Image $image, $width, $height, $directory = '')
    {
        $coef_width = $image->get_width() / $width;
        $coef_height = $image->get_height() / $height;

        $ratio = max($coef_width,$coef_height);

        $width = $image->get_width() / $ratio;
        $height = $image->get_height() / $ratio;

        $this->resize($image, $width, $height, $directory);
    }

    public function resize_width(Image $image, $width, $directory)
    {
        $height = $image->get_height() / ($image->get_width() / $width);

        $this->resize($image, $width, $height, $directory);
    }

    public function resize_height(Image $image, $height, $directory)
    {
        $width = $image->get_width() / ($image->get_height() / $height);

        $this->resize($image, $width, $height, $directory);
    }

    private function default_path(Image $image, $directory)
    {
        if (empty($directory))
            return $image->get_path();
        else
            return $directory;
    }

    private function create_image_identifier(Image $Image)
    {
        switch ($Image->get_mime_type())
        {
            case 'image/jpeg':
                    return imagecreatefromjpeg($Image->get_path());
                break;
            case 'image/png':
                    return imagecreatefrompng($Image->get_path());
                break;
            case 'image/gif':
                    return imagecreatefromgif($Image->get_path());
                break;
            default:
                throw new UnsupportedOperationException($image->get_mime_type() . ' mime type is not supported.');
        }
    }

    private function create_ressource(Image $Image, $width, $height)
    {
        if ($Image->get_mime_type() == 'image/gif')
        {
            return imagecreate($width, $height);
        }
        else
        {
            return imagecreatetruecolor($width, $height);
        }
    }

    private function extension_new_path($directory)
    {
        $explode = explode('/', $directory);
        $name_and_extension = array_pop($explode);
        $explode = explode('.', $name_and_extension);
        return TextHelper::strtolower(array_pop($explode));
    }

    private function create_image(Image $image, $create_picture, $directory)
    {
        $extension = $this->extension_new_path($directory);
        switch ($extension)
        {
            case 'jpeg':
                return imagejpeg($create_picture, $directory);
                    break;
            case 'jpg':
                return imagejpeg($create_picture, $directory);
                    break;
            case 'png':
                return imagepng($create_picture, $directory);
                    break;
            case 'gif':
                return imagegif($create_picture, $directory);
                    break;
            default:
                throw new UnsupportedOperationException($image->get_mime_type() . ' mime type is not supported.');
        }
    }

    /**
     * @throws Exception if the GD extension is not loaded
     */
    private function assert_gd_extension_is_loaded()
    {
        $server_configuration = new ServerConfiguration();
        if (!$server_configuration->has_gd_library())
        {
            throw new Exception('The GD extension is required but not loaded.');
        }
    }
}
?>
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