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<?php |
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namespace Imagecow\Crops; |
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use Imagick; |
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use Imagecow\ImageException; |
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/** |
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* This class is adapted from Stig Lindqvist's great Crop library: |
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* https://github.com/stojg/crop |
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* Copyright (c) 2013, Stig Lindqvist. |
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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 Face extends Entropy |
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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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* 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 static $safeZoneList = array(); |
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/** |
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* originalImage |
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* |
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* @var object |
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* @access protected |
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*/ |
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protected static $originalImage; |
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/** |
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* baseDimension |
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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 static $baseDimension = array(); |
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/** |
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* Returns the x,y values. |
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* |
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* @param Imagick $original |
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* @param int $targetWidth |
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* @param int $targetHeight |
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* |
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* @return array |
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*/ |
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public static function getOffsets(Imagick $original, $targetWidth, $targetHeight) |
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{ |
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static::$originalImage = $original; |
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static::$baseDimension = [ |
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'width' => $original->getImageWidth(), |
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'height' => $original->getImageWidth(), |
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]; |
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parent::getOffsets($original, $targetWidth, $targetHeight); |
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} |
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/** |
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* getBaseDimension |
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* |
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* @param string $key width|height |
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* |
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* @access protected |
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* |
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* @return int |
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*/ |
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protected static function getBaseDimension($key) |
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{ |
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if (isset(static::$baseDimension)) { |
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return static::$baseDimension[$key]; |
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} elseif ($key === 'width') { |
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return static::$originalImage->getImageWidth(); |
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} |
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return static::$originalImage->getImageHeight(); |
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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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* |
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* @return array |
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*/ |
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protected static function getFaceList() |
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{ |
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if (!function_exists('face_detect')) { |
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throw new ImageException('PHP Facedetect extension must be installed. See http://www.xarg.org/project/php-facedetect/ for more details'); |
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} |
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$faceList = static::getFaceListFromClassifier(self::CLASSIFIER_FACE); |
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if (!is_array($faceList)) { |
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$faceList = []; |
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} |
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$profileList = static::getFaceListFromClassifier(self::CLASSIFIER_PROFILE); |
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if (!is_array($profileList)) { |
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$profileList = []; |
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} |
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return array_merge($faceList, $profileList); |
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} |
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/** |
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* getFaceListFromClassifier |
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* |
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* @param string $classifier |
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* |
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* @access protected |
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* |
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* @return array |
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*/ |
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protected static function getFaceListFromClassifier($classifier) |
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{ |
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$file = tmpfile(); |
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static::$originalImage->writeImageFile($file); |
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$faceList = face_detect(stream_get_meta_data($file)['uri'], __DIR__.$classifier); |
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fclose($file); |
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return $faceList; |
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} |
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/** |
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* getSafeZoneList |
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* |
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* @access protected |
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* |
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* @return array |
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*/ |
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protected static function getSafeZoneList() |
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{ |
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// the local key is the current image width-height |
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$key = static::$originalImage->getImageWidth().'-'.static::$originalImage->getImageHeight(); |
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if (isset(static::$safeZoneList[$key])) { |
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return static::$safeZoneList[$key]; |
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} |
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$faceList = static::getFaceList(); |
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// getFaceList works on the main image, so we use a ratio between main/current image |
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$xRatio = static::getBaseDimension('width') / static::$originalImage->getImageWidth(); |
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$yRatio = static::getBaseDimension('height') / static::$originalImage->getImageHeight(); |
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$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'] / $yRatio), |
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); |
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} |
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static::$safeZoneList[$key] = $safeZoneList; |
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return static::$safeZoneList[$key]; |
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} |
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} |
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oscarotero /
imagecow
