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<?php /** This file is part of KCFinder project * * @desc Abstract image driver class * @package KCFinder * @version 3.12 * @author Pavel Tzonkov <sunhater@sunhater.com> * @copyright 2010-2014 KCFinder Project * @license http://opensource.org/licenses/GPL-3.0 GPLv3 * @license http://opensource.org/licenses/LGPL-3.0 LGPLv3 * @link http://kcfinder.sunhater.com */ namespace kcfinder; abstract class image { const DEFAULT_JPEG_QUALITY = 75; /** Image resource or object * @var mixed */ protected $image; /** Image width in pixels * @var integer */ protected $width; /** Image height in pixels * @var integer */ protected $height; /** Init error * @var bool */ protected $initError = false; /** Driver specific options * @var array */ protected $options = array(); /** Magic method which allows read-only access to all protected or private * class properties * @param string $property * @return mixed */ final public function __get($property) { return property_exists($this, $property) ? $this->$property : null; } /** Constructor. Parameter $image should be: * 1. An instance of image driver class (copy instance). * 2. An image represented by the type of the $image property * (resource or object). * 3. An array with two elements. First - width, second - height. * Creates a blank image. * 4. A filename string. Get image form file. * Second paramaeter is used by pass some specific image driver options * @param mixed $image * @param array $options */ public function __construct($image, array $options=array()) { $this->image = $this->width = $this->height = null; $imageDetails = $this->buildImage($image); if ($imageDetails !== false) list($this->image, $this->width, $this->height) = $imageDetails; else $this->initError = true; $this->options = $options; } /** Factory pattern to load selected driver. $image and $options are passed * to the constructor of the image driver * @param string $driver * @param mixed $image * @return object */ final static function factory($driver, $image, array $options=array()) { $class = __NAMESPACE__ . "\\image_$driver"; return new $class($image, $options); } /** Checks if the drivers in the array parameter could be used. Returns first * found one * @param array $drivers * @return string */ final static function getDriver(array $drivers=array('gd')) { foreach ($drivers as $driver) { if (!preg_match('/^[a-z0-9\_]+$/i', $driver)) continue; $class = __NAMESPACE__ . "\\image_$driver"; if (class_exists($class) && method_exists($class, "available")) { eval("\$avail = $class::available();"); if ($avail) return $driver; } } return false; } /** Returns an array. Element 0 - image resource. Element 1 - width. Element 2 - height. * Returns FALSE on failure. * @param mixed $image * @return array */ final protected function buildImage($image) { $class = get_class($this); if ($image instanceof $class) { $width = $image->width; $height = $image->height; $img = $image->image; } elseif (is_array($image)) { list($key, $width) = each($image); list($key, $height) = each($image); $img = $this->getBlankImage($width, $height); } else $img = $this->getImage($image, $width, $height); return ($img !== false) ? array($img, $width, $height) : false; } /** Returns calculated proportional width from the given height * @param integer $resizedHeight * @return integer */ final public function getPropWidth($resizedHeight) { $width = round(($this->width * $resizedHeight) / $this->height); if (!$width) $width = 1; return $width; } /** Returns calculated proportional height from the given width * @param integer $resizedWidth * @return integer */ final public function getPropHeight($resizedWidth) { $height = round(($this->height * $resizedWidth) / $this->width); if (!$height) $height = 1; return $height; } /** Checks if PHP needs some extra extensions to use the image driver. This * static method should be implemented into driver classes like abstract * methods * @return bool */ static function available() { return false; } /** Checks if file is an image. This static method should be implemented into * driver classes like abstract methods * @param string $file * @return bool */ static function checkImage($file) { return false; } /** Resize image. Should return TRUE on success or FALSE on failure * @param integer $width * @param integer $height * @return bool */ abstract public function resize($width, $height); /** Resize image to fit in given resolution. Should returns TRUE on success * or FALSE on failure. If $background is set, the image size will be * $width x $height and the empty spaces (if any) will be filled with defined * color. Background color examples: "#5f5", "#ff67ca", array(255, 255, 255) * @param integer $width * @param integer $height * @param mixed $background * @return bool */ abstract public function resizeFit($width, $height, $background=false); /** Resize and crop the image to fit in given resolution. Returns TRUE on * success or FALSE on failure * @param mixed $src * @param integer $offset * @return bool */ abstract public function resizeCrop($width, $height, $offset=false); /** Rotate image * @param integer $angle * @param string $background * @return bool */ abstract public function rotate($angle, $background="#000000"); abstract public function flipHorizontal(); abstract public function flipVertical(); /** Apply a PNG or GIF watermark to the image. $top and $left parameters sets * the offset of the watermark in pixels. Boolean and NULL values are possible * too. In default case (FALSE, FALSE) the watermark should be applyed to * the bottom right corner. NULL values means center aligning. If the * watermark is bigger than the image or it's partialy or fully outside the * image, it shoudn't be applied * @param string $file * @param mixed $top * @param mixed $left * @return bool */ abstract public function watermark($file, $left=false, $top=false); /** Should output the image. Second parameter is used to pass some options like * 'file' - if is set, the output will be written to a file * 'quality' - compression quality * It's possible to use extra specific options required by image type ($type) * @param string $type * @param array $options * @return bool */ abstract public function output($type='jpeg', array $options=array()); /** This method should create a blank image with selected size. Should returns * resource or object related to the created image, which will be passed to * $image property * @param integer $width * @param integer $height * @return mixed */ abstract protected function getBlankImage($width, $height); /** This method should create an image from source image. Only first parameter * ($image) is input. Its type should be filename string or a type of the * $image property. See the constructor reference for details. The * parametters $width and $height are output only. Should returns resource or * object related to the created image, which will be passed to $image * property * @param mixed $image * @param integer $width * @param integer $height * @return mixed */ abstract protected function getImage($image, &$width, &$height); }
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