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<?php |
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namespace stojg\crop; |
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/** |
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* CropFace |
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* |
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* This class will try to find the most interesting point in the image by trying to find a face and |
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* center the crop on that |
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* |
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* @todo implement |
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* @see https://github.com/mauricesvay/php-facedetection/blob/master/FaceDetector.php |
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*/ |
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class CropFace extends CropEntropy |
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{ |
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const CLASSIFIER_FACE = '/classifier/haarcascade_frontalface_default.xml'; |
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const CLASSIFIER_PROFILE = '/classifier/haarcascade_profileface.xml'; |
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/** |
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* imagePath original image path |
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* |
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* @var mixed |
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* @access protected |
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*/ |
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protected $imagePath; |
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/** |
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* safeZoneList |
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* |
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* @var array |
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* @access protected |
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*/ |
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protected $safeZoneList; |
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/** |
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* max execution time (in seconds) |
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* |
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* @var int |
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* @access protected |
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*/ |
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protected $maxExecutionTime; |
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/** |
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* |
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* @param string $imagePath |
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*/ |
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public function __construct($imagePath) |
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{ |
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$this->imagePath = $imagePath; |
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parent::__construct($imagePath); |
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} |
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/** |
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* setMaxExecutionTime |
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* |
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* @param int $maxExecutionTime max execution time (in sec) |
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* @access public |
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* @return void |
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*/ |
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public function setMaxExecutionTime($maxExecutionTime) |
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{ |
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$this->maxExecutionTime = $maxExecutionTime; |
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} |
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/** |
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* getFaceList get faces positions and sizes |
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* |
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* @access protected |
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* @return array |
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*/ |
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protected function getFaceList() |
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{ |
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if (!function_exists('face_detect')) { |
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$msg = 'PHP Facedetect extension must be installed. |
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See http://www.xarg.org/project/php-facedetect/ for more details'; |
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throw new \Exception($msg); |
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} |
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if ($this->maxExecutionTime) { |
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$timeBefore = microtime(true); |
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} |
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$faceList = $this->getFaceListFromClassifier(self::CLASSIFIER_FACE); |
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if ($this->maxExecutionTime) { |
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$timeSpent = microtime(true) - $timeBefore; |
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} |
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if (!$this->maxExecutionTime || $timeSpent < ($this->maxExecutionTime / 2)) { |
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$profileList = $this->getFaceListFromClassifier(self::CLASSIFIER_PROFILE); |
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$faceList = array_merge($faceList, $profileList); |
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} |
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return $faceList; |
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} |
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/** |
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* getFaceListFromClassifier |
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* |
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* @param string $classifier |
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* @access protected |
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* @return array |
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*/ |
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protected function getFaceListFromClassifier($classifier) |
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{ |
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$faceList = face_detect($this->imagePath, __DIR__ . $classifier); |
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if (!$faceList) { |
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$faceList = array(); |
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} |
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return $faceList; |
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} |
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/** |
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* getSafeZoneList |
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* |
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* @access private |
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* @return array |
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*/ |
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protected function getSafeZoneList() |
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{ |
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if (!isset($this->safeZoneList)) { |
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$this->safeZoneList = array(); |
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} |
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// the local key is the current image width-height |
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$key = $this->originalImage->getImageWidth() . '-' . $this->originalImage->getImageHeight(); |
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if (!isset($this->safeZoneList[$key])) { |
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$faceList = $this->getFaceList(); |
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// getFaceList works on the main image, so we use a ratio between main/current image |
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$xRatio = $this->getBaseDimension('width') / $this->originalImage->getImageWidth(); |
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$yRatio = $this->getBaseDimension('height') / $this->originalImage->getImageHeight(); |
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$safeZoneList = array(); |
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foreach ($faceList as $face) { |
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$hw = ceil($face['w'] / 2); |
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$hh = ceil($face['h'] / 2); |
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$safeZone = array( |
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'left' => $face['x'] - $hw, |
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'right' => $face['x'] + $face['w'] + $hw, |
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'top' => $face['y'] - $hh, |
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'bottom' => $face['y'] + $face['h'] + $hh |
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); |
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$safeZoneList[] = array( |
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'left' => round($safeZone['left'] / $xRatio), |
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'right' => round($safeZone['right'] / $xRatio), |
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'top' => round($safeZone['top'] / $yRatio), |
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'bottom' => round($safeZone['bottom'] / $yRatio), |
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); |
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} |
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$this->safeZoneList[$key] = $safeZoneList; |
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} |
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return $this->safeZoneList[$key]; |
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} |
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} |
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stojg /
crop
Loading history...
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: