<?php
  
  /**
  * ownCloud
  *
  * @author Thomas Tanghus
  * @copyright 2011 Thomas Tanghus <thomas@tanghus.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
  * License as published by the Free Software Foundation; either
  * version 3 of the License, or any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
  /**
   * Class for basic image manipulation
   */
  class OC_Image {
  	protected $resource = false; // tmp resource.

  	protected $imageType = IMAGETYPE_PNG; // Default to png if file type isn't evident.
  	protected $mimeType = "image/png"; // Default to png
  	protected $bitDepth = 24;
  	protected $filePath = null;
  
  	private $fileInfo;

  
  	/**
  	* @brief Get mime type for an image file.
  	* @param $filepath The path to a local image file.
  	* @returns string The mime type if the it could be determined, otherwise an empty string.
  	*/

  	static public function getMimeTypeForFile($filePath) {

  		// exif_imagetype throws "read error!" if file is less than 12 byte

  		if (filesize($filePath) > 11) {
  			$imageType = exif_imagetype($filePath);

  		}
  		else {

  			$imageType = false;

  		}

  		return $imageType ? image_type_to_mime_type($imageType) : '';

  	}
  
  	/**
  	* @brief Constructor.
  	* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.
  	* @returns bool False on error
  	*/

  	public function __construct($imageRef = null) {

  		//OC_Log::write('core',__METHOD__.'(): start', OC_Log::DEBUG);
  		if(!extension_loaded('gd') || !function_exists('gd_info')) {
  			OC_Log::write('core', __METHOD__.'(): GD module not installed', OC_Log::ERROR);
  			return false;
  		}

  
  		if (\OC_Util::fileInfoLoaded()) {
  			$this->fileInfo = new finfo(FILEINFO_MIME_TYPE);
  		}
  
  		if(!is_null($imageRef)) {
  			$this->load($imageRef);

  		}
  	}
  
  	/**
  	* @brief Determine whether the object contains an image resource.
  	* @returns bool
  	*/
  	public function valid() { // apparently you can't name a method 'empty'...
  		return is_resource($this->resource);
  	}
  
  	/**
  	* @brief Returns the MIME type of the image or an empty string if no image is loaded.
  	* @returns int
  	*/
  	public function mimeType() {

  		return $this->valid() ? $this->mimeType : '';

  	}
  
  	/**
  	* @brief Returns the width of the image or -1 if no image is loaded.
  	* @returns int
  	*/
  	public function width() {
  		return $this->valid() ? imagesx($this->resource) : -1;
  	}
  
  	/**
  	* @brief Returns the height of the image or -1 if no image is loaded.
  	* @returns int
  	*/
  	public function height() {
  		return $this->valid() ? imagesy($this->resource) : -1;
  	}
  
  	/**
  	* @brief Returns the width when the image orientation is top-left.
  	* @returns int
  	*/
  	public function widthTopLeft() {
  		$o = $this->getOrientation();
  		OC_Log::write('core', 'OC_Image->widthTopLeft() Orientation: '.$o, OC_Log::DEBUG);
  		switch($o) {
  			case -1:
  			case 1:
  			case 2: // Not tested
  			case 3:
  			case 4: // Not tested
  				return $this->width();
  				break;
  			case 5: // Not tested
  			case 6:
  			case 7: // Not tested
  			case 8:
  				return $this->height();
  				break;
  		}
  		return $this->width();
  	}
  
  	/**
  	* @brief Returns the height when the image orientation is top-left.
  	* @returns int
  	*/
  	public function heightTopLeft() {
  		$o = $this->getOrientation();
  		OC_Log::write('core', 'OC_Image->heightTopLeft() Orientation: '.$o, OC_Log::DEBUG);
  		switch($o) {
  			case -1:
  			case 1:
  			case 2: // Not tested
  			case 3:
  			case 4: // Not tested
  				return $this->height();
  				break;
  			case 5: // Not tested
  			case 6:
  			case 7: // Not tested
  			case 8:
  				return $this->width();
  				break;
  		}
  		return $this->height();
  	}
  
  	/**
  	* @brief Outputs the image.
  	* @returns bool
  	*/
  	public function show() {
  		header('Content-Type: '.$this->mimeType());
  		return $this->_output();
  	}
  
  	/**
  	* @brief Saves the image.
  	* @returns bool
  	*/

  	public function save($filePath=null) {
  		if($filePath === null && $this->filePath === null) {

  			OC_Log::write('core', __METHOD__.'(): called with no path.', OC_Log::ERROR);
  			return false;

  		} elseif($filePath === null && $this->filePath !== null) {
  			$filePath = $this->filePath;

  		}

  		return $this->_output($filePath);

  	}
  
  	/**
  	* @brief Outputs/saves the image.
  	*/

  	private function _output($filePath=null) {
  		if($filePath) {
  			if (!file_exists(dirname($filePath)))
  				mkdir(dirname($filePath), 0777, true);
  			if(!is_writable(dirname($filePath))) {

  				OC_Log::write('core',

  					__METHOD__.'(): Directory \''.dirname($filePath).'\' is not writable.',

  					OC_Log::ERROR);
  				return false;

  			} elseif(is_writable(dirname($filePath)) && file_exists($filePath) && !is_writable($filePath)) {
  				OC_Log::write('core', __METHOD__.'(): File \''.$filePath.'\' is not writable.', OC_Log::ERROR);

  				return false;
  			}
  		}
  		if (!$this->valid()) {
  			return false;
  		}

  		$retVal = false;
  		switch($this->imageType) {

  			case IMAGETYPE_GIF:

  				$retVal = imagegif($this->resource, $filePath);

  				break;
  			case IMAGETYPE_JPEG:

  				$retVal = imagejpeg($this->resource, $filePath);

  				break;
  			case IMAGETYPE_PNG:

  				$retVal = imagepng($this->resource, $filePath);

  				break;
  			case IMAGETYPE_XBM:

  				$retVal = imagexbm($this->resource, $filePath);

  				break;
  			case IMAGETYPE_WBMP:

  				$retVal = imagewbmp($this->resource, $filePath);

  				break;
  			case IMAGETYPE_BMP:

  				$retVal = imagebmp($this->resource, $filePath, $this->bitDepth);

  				break;
  			default:

  				$retVal = imagepng($this->resource, $filePath);

  		}

  		return $retVal;

  	}
  
  	/**
  	* @brief Prints the image when called as $image().
  	*/
  	public function __invoke() {
  		return $this->show();
  	}
  
  	/**
  	* @returns Returns the image resource in any.
  	*/
  	public function resource() {
  		return $this->resource;
  	}
  
  	/**
  	* @returns Returns the raw image data.
  	*/
  	function data() {
  		ob_start();

  		switch ($this->mimeType) {
  			case "image/png":
  				$res = imagepng($this->resource);
  				break;
  			case "image/jpeg":
  				$res = imagejpeg($this->resource);
  				break;
  			case "image/gif":
  				$res = imagegif($this->resource);
  				break;
  			default:
  				$res = imagepng($this->resource);
  				OC_Log::write('core', 'OC_Image->data. Couldn\'t guess mimetype, defaulting to png', OC_Log::INFO);
  				break;
  		}

  		if (!$res) {
  			OC_Log::write('core', 'OC_Image->data. Error getting image data.', OC_Log::ERROR);
  		}
  		return ob_get_clean();
  	}
  
  	/**
  	* @returns Returns a base64 encoded string suitable for embedding in a VCard.
  	*/
  	function __toString() {
  		return base64_encode($this->data());
  	}
  
  	/**
  	* (I'm open for suggestions on better method name ;)
  	* @brief Get the orientation based on EXIF data.
  	* @returns The orientation or -1 if no EXIF data is available.
  	*/
  	public function getOrientation() {
  		if(!is_callable('exif_read_data')) {
  			OC_Log::write('core', 'OC_Image->fixOrientation() Exif module not enabled.', OC_Log::DEBUG);
  			return -1;
  		}
  		if(!$this->valid()) {
  			OC_Log::write('core', 'OC_Image->fixOrientation() No image loaded.', OC_Log::DEBUG);
  			return -1;
  		}

  		if(is_null($this->filePath) || !is_readable($this->filePath)) {

  			OC_Log::write('core', 'OC_Image->fixOrientation() No readable file path set.', OC_Log::DEBUG);
  			return -1;
  		}

  		$exif = @exif_read_data($this->filePath, 'IFD0');

  		if(!$exif) {
  			return -1;
  		}
  		if(!isset($exif['Orientation'])) {
  			return -1;
  		}
  		return $exif['Orientation'];
  	}
  
  	/**
  	* (I'm open for suggestions on better method name ;)
  	* @brief Fixes orientation based on EXIF data.
  	* @returns bool.
  	*/
  	public function fixOrientation() {
  		$o = $this->getOrientation();
  		OC_Log::write('core', 'OC_Image->fixOrientation() Orientation: '.$o, OC_Log::DEBUG);
  		$rotate = 0;
  		$flip = false;
  		switch($o) {
  			case -1:
  				return false; //Nothing to fix
  				break;
  			case 1:
  				$rotate = 0;
  				$flip = false;
  				break;
  			case 2: // Not tested
  				$rotate = 0;
  				$flip = true;
  				break;
  			case 3:
  				$rotate = 180;
  				$flip = false;
  				break;
  			case 4: // Not tested
  				$rotate = 180;
  				$flip = true;
  				break;
  			case 5: // Not tested
  				$rotate = 90;
  				$flip = true;
  				break;
  			case 6:
  				//$rotate = 90;
  				$rotate = 270;
  				$flip = false;
  				break;
  			case 7: // Not tested
  				$rotate = 270;
  				$flip = true;
  				break;
  			case 8:
  				$rotate = 90;
  				$flip = false;
  				break;
  		}
  		if($rotate) {
  			$res = imagerotate($this->resource, $rotate, -1);
  			if($res) {
  				if(imagealphablending($res, true)) {
  					if(imagesavealpha($res, true)) {
  						imagedestroy($this->resource);
  						$this->resource = $res;
  						return true;
  					} else {
  						OC_Log::write('core', 'OC_Image->fixOrientation() Error during alphasaving.', OC_Log::DEBUG);
  						return false;
  					}
  				} else {
  					OC_Log::write('core', 'OC_Image->fixOrientation() Error during alphablending.', OC_Log::DEBUG);
  					return false;
  				}
  			} else {
  				OC_Log::write('core', 'OC_Image->fixOrientation() Error during oriention fixing.', OC_Log::DEBUG);
  				return false;
  			}
  		}
  	}
  
  	/**
  	* @brief Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function.
  	* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function or a file resource (file handle	).
  	* @returns An image resource or false on error
  	*/

  	public function load($imageRef) {
  		if(is_resource($imageRef)) {
  			if(get_resource_type($imageRef) == 'gd') {
  				$this->resource = $imageRef;

  				return $this->resource;

  			} elseif(in_array(get_resource_type($imageRef), array('file', 'stream'))) {
  				return $this->loadFromFileHandle($imageRef);

  			}

  		} elseif($this->loadFromFile($imageRef) !== false) {

  			return $this->resource;

  		} elseif($this->loadFromBase64($imageRef) !== false) {

  			return $this->resource;

  		} elseif($this->loadFromData($imageRef) !== false) {

  			return $this->resource;
  		} else {
  			OC_Log::write('core', __METHOD__.'(): couldn\'t load anything. Giving up!', OC_Log::DEBUG);
  			return false;
  		}
  	}
  
  	/**
  	* @brief Loads an image from an open file handle.
  	* It is the responsibility of the caller to position the pointer at the correct place and to close the handle again.
  	* @param $handle
  	* @returns An image resource or false on error
  	*/
  	public function loadFromFileHandle($handle) {
  		OC_Log::write('core', __METHOD__.'(): Trying', OC_Log::DEBUG);
  		$contents = stream_get_contents($handle);
  		if($this->loadFromData($contents)) {
  			return $this->resource;
  		}
  	}
  
  	/**
  	* @brief Loads an image from a local file.
  	* @param $imageref The path to a local file.
  	* @returns An image resource or false on error
  	*/

  	public function loadFromFile($imagePath=false) {

  		// exif_imagetype throws "read error!" if file is less than 12 byte

  		if(!@is_file($imagePath) || !file_exists($imagePath) || filesize($imagePath) < 12 || !is_readable($imagePath)) {

  			// Debug output disabled because this method is tried before loadFromBase64?

  			OC_Log::write('core', 'OC_Image->loadFromFile, couldn\'t load: '.$imagePath, OC_Log::DEBUG);

  			return false;
  		}

  		$iType = exif_imagetype($imagePath);
  		switch ($iType) {

  			case IMAGETYPE_GIF:
  				if (imagetypes() & IMG_GIF) {

  					$this->resource = imagecreatefromgif($imagePath);

  				} else {
  					OC_Log::write('core',

  						'OC_Image->loadFromFile, GIF images not supported: '.$imagePath,

  						OC_Log::DEBUG);
  				}
  				break;
  			case IMAGETYPE_JPEG:
  				if (imagetypes() & IMG_JPG) {

  					$this->resource = imagecreatefromjpeg($imagePath);

  				} else {
  					OC_Log::write('core',

  						'OC_Image->loadFromFile, JPG images not supported: '.$imagePath,

  						OC_Log::DEBUG);
  				}
  				break;
  			case IMAGETYPE_PNG:
  				if (imagetypes() & IMG_PNG) {

  					$this->resource = imagecreatefrompng($imagePath);

  				} else {
  					OC_Log::write('core',

  						'OC_Image->loadFromFile, PNG images not supported: '.$imagePath,

  						OC_Log::DEBUG);
  				}
  				break;
  			case IMAGETYPE_XBM:
  				if (imagetypes() & IMG_XPM) {

  					$this->resource = imagecreatefromxbm($imagePath);

  				} else {
  					OC_Log::write('core',

  						'OC_Image->loadFromFile, XBM/XPM images not supported: '.$imagePath,

  						OC_Log::DEBUG);
  				}
  				break;
  			case IMAGETYPE_WBMP:
  				if (imagetypes() & IMG_WBMP) {

  					$this->resource = imagecreatefromwbmp($imagePath);

  				} else {
  					OC_Log::write('core',

  						'OC_Image->loadFromFile, WBMP images not supported: '.$imagePath,

  						OC_Log::DEBUG);
  				}
  				break;
  			case IMAGETYPE_BMP:

  					$this->resource = $this->imagecreatefrombmp($imagePath);

  				break;
  			/*
  			case IMAGETYPE_TIFF_II: // (intel byte order)
  				break;
  			case IMAGETYPE_TIFF_MM: // (motorola byte order)
  				break;
  			case IMAGETYPE_JPC:
  				break;
  			case IMAGETYPE_JP2:
  				break;
  			case IMAGETYPE_JPX:
  				break;
  			case IMAGETYPE_JB2:
  				break;
  			case IMAGETYPE_SWC:
  				break;
  			case IMAGETYPE_IFF:
  				break;
  			case IMAGETYPE_ICO:
  				break;
  			case IMAGETYPE_SWF:
  				break;
  			case IMAGETYPE_PSD:
  				break;
  			*/
  			default:
  
  				// this is mostly file created from encrypted file

  				$this->resource = imagecreatefromstring(\OC\Files\Filesystem::file_get_contents(\OC\Files\Filesystem::getLocalPath($imagePath)));
  				$iType = IMAGETYPE_PNG;

  				OC_Log::write('core', 'OC_Image->loadFromFile, Default', OC_Log::DEBUG);
  				break;
  		}
  		if($this->valid()) {

  			$this->imageType = $iType;
  			$this->mimeType = image_type_to_mime_type($iType);
  			$this->filePath = $imagePath;

  		}
  		return $this->resource;
  	}
  
  	/**
  	* @brief Loads an image from a string of data.
  	* @param $str A string of image data as read from a file.
  	* @returns An image resource or false on error
  	*/
  	public function loadFromData($str) {
  		if(is_resource($str)) {
  			return false;
  		}
  		$this->resource = @imagecreatefromstring($str);

  		if ($this->fileInfo) {
  			$this->mimeType = $this->fileInfo->buffer($str);
  		}
  		if(is_resource($this->resource)) {
  			imagealphablending($this->resource, false);
  			imagesavealpha($this->resource, true);
  		}

  		if(!$this->resource) {
  			OC_Log::write('core', 'OC_Image->loadFromData, couldn\'t load', OC_Log::DEBUG);
  			return false;
  		}
  		return $this->resource;
  	}
  
  	/**
  	* @brief Loads an image from a base64 encoded string.
  	* @param $str A string base64 encoded string of image data.
  	* @returns An image resource or false on error
  	*/
  	public function loadFromBase64($str) {
  		if(!is_string($str)) {
  			return false;
  		}
  		$data = base64_decode($str);
  		if($data) { // try to load from string data
  			$this->resource = @imagecreatefromstring($data);

  			if ($this->fileInfo) {
  				$this->mimeType = $this->fileInfo->buffer($data);
  			}

  			if(!$this->resource) {
  				OC_Log::write('core', 'OC_Image->loadFromBase64, couldn\'t load', OC_Log::DEBUG);
  				return false;
  			}
  			return $this->resource;
  		} else {
  			return false;
  		}
  	}
  
  	/**
  	 * Create a new image from file or URL
  	 * @link http://www.programmierer-forum.de/function-imagecreatefrombmp-laeuft-mit-allen-bitraten-t143137.htm
  	 * @version 1.00
  	 * @param string $filename <p>
  	 * Path to the BMP image.
  	 * </p>
  	 * @return resource an image resource identifier on success, <b>FALSE</b> on errors.
  	 */

  	private function imagecreatefrombmp($fileName) {
  		if (!($fh = fopen($fileName, 'rb'))) {
  			trigger_error('imagecreatefrombmp: Can not open ' . $fileName, E_USER_WARNING);

  			return false;
  		}
  		// read file header
  		$meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14));
  		// check for bitmap
  		if ($meta['type'] != 19778) {

  			trigger_error('imagecreatefrombmp: ' . $fileName . ' is not a bitmap!', E_USER_WARNING);

  			return false;
  		}
  		// read image header
  		$meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40));
  		// read additional 16bit header
  		if ($meta['bits'] == 16) {
  			$meta += unpack('VrMask/VgMask/VbMask', fread($fh, 12));
  		}
  		// set bytes and padding
  		$meta['bytes'] = $meta['bits'] / 8;

  		$this->bitDepth = $meta['bits']; //remember the bit depth for the imagebmp call

  		$meta['decal'] = 4 - (4 * (($meta['width'] * $meta['bytes'] / 4)- floor($meta['width'] * $meta['bytes'] / 4)));
  		if ($meta['decal'] == 4) {
  			$meta['decal'] = 0;
  		}
  		// obtain imagesize
  		if ($meta['imagesize'] < 1) {
  			$meta['imagesize'] = $meta['filesize'] - $meta['offset'];
  			// in rare cases filesize is equal to offset so we need to read physical size
  			if ($meta['imagesize'] < 1) {
  				$meta['imagesize'] = @filesize($filename) - $meta['offset'];
  				if ($meta['imagesize'] < 1) {
  					trigger_error('imagecreatefrombmp: Can not obtain filesize of ' . $filename . '!', E_USER_WARNING);
  					return false;
  				}
  			}
  		}
  		// calculate colors
  		$meta['colors'] = !$meta['colors'] ? pow(2, $meta['bits']) : $meta['colors'];
  		// read color palette
  		$palette = array();
  		if ($meta['bits'] < 16) {
  			$palette = unpack('l' . $meta['colors'], fread($fh, $meta['colors'] * 4));
  			// in rare cases the color value is signed
  			if ($palette[1] < 0) {
  				foreach ($palette as $i => $color) {
  					$palette[$i] = $color + 16777216;
  				}
  			}
  		}
  		// create gd image
  		$im = imagecreatetruecolor($meta['width'], $meta['height']);
  		$data = fread($fh, $meta['imagesize']);
  		$p = 0;
  		$vide = chr(0);
  		$y = $meta['height'] - 1;

  		$error = 'imagecreatefrombmp: ' . $fileName . ' has not enough data!';

  		// loop through the image data beginning with the lower left corner
  		while ($y >= 0) {
  			$x = 0;
  			while ($x < $meta['width']) {
  				switch ($meta['bits']) {
  					case 32:
  					case 24:
  						if (!($part = substr($data, $p, 3))) {
  							trigger_error($error, E_USER_WARNING);
  							return $im;
  						}
  						$color = unpack('V', $part . $vide);
  						break;
  					case 16:
  						if (!($part = substr($data, $p, 2))) {
  							trigger_error($error, E_USER_WARNING);
  							return $im;
  						}
  						$color = unpack('v', $part);
  						$color[1] = (($color[1] & 0xf800) >> 8) * 65536 + (($color[1] & 0x07e0) >> 3) * 256 + (($color[1] & 0x001f) << 3);
  						break;
  					case 8:
  						$color = unpack('n', $vide . substr($data, $p, 1));
  						$color[1] = $palette[ $color[1] + 1 ];
  						break;
  					case 4:
  						$color = unpack('n', $vide . substr($data, floor($p), 1));
  						$color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F;
  						$color[1] = $palette[ $color[1] + 1 ];
  						break;
  					case 1:
  						$color = unpack('n', $vide . substr($data, floor($p), 1));
  						switch (($p * 8) % 8) {
  							case 0:
  								$color[1] = $color[1] >> 7;
  								break;
  							case 1:
  								$color[1] = ($color[1] & 0x40) >> 6;
  								break;
  							case 2:
  								$color[1] = ($color[1] & 0x20) >> 5;
  								break;
  							case 3:
  								$color[1] = ($color[1] & 0x10) >> 4;
  								break;
  							case 4:
  								$color[1] = ($color[1] & 0x8) >> 3;
  								break;
  							case 5:
  								$color[1] = ($color[1] & 0x4) >> 2;
  								break;
  							case 6:
  								$color[1] = ($color[1] & 0x2) >> 1;
  								break;
  							case 7:
  								$color[1] = ($color[1] & 0x1);
  								break;
  						}
  						$color[1] = $palette[ $color[1] + 1 ];
  						break;
  					default:
  						trigger_error('imagecreatefrombmp: '

  							. $fileName . ' has ' . $meta['bits'] . ' bits and this is not supported!',

  							E_USER_WARNING);
  						return false;
  				}
  				imagesetpixel($im, $x, $y, $color[1]);
  				$x++;
  				$p += $meta['bytes'];
  			}
  			$y--;
  			$p += $meta['decal'];
  		}
  		fclose($fh);
  		return $im;
  	}
  
  	/**
  	* @brief Resizes the image preserving ratio.
  	* @param $maxsize The maximum size of either the width or height.
  	* @returns bool
  	*/

  	public function resize($maxSize) {

  		if(!$this->valid()) {
  			OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR);
  			return false;
  		}

  		$widthOrig=imageSX($this->resource);
  		$heightOrig=imageSY($this->resource);
  		$ratioOrig = $widthOrig/$heightOrig;

  		if ($ratioOrig > 1) {
  			$newHeight = round($maxSize/$ratioOrig);
  			$newWidth = $maxSize;

  		} else {

  			$newWidth = round($maxSize*$ratioOrig);
  			$newHeight = $maxSize;

  		}

  		$this->preciseResize(round($newWidth), round($newHeight));

  		return true;
  	}
  
  	public function preciseResize($width, $height) {
  		if (!$this->valid()) {
  			OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR);
  			return false;
  		}

  		$widthOrig=imageSX($this->resource);
  		$heightOrig=imageSY($this->resource);

  		$process = imagecreatetruecolor($width, $height);
  
  		if ($process == false) {
  			OC_Log::write('core', __METHOD__.'(): Error creating true color image', OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  
  		// preserve transparency

  		if($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) {

  			imagecolortransparent($process, imagecolorallocatealpha($process, 0, 0, 0, 127));
  			imagealphablending($process, false);
  			imagesavealpha($process, true);
  		}

  		imagecopyresampled($process, $this->resource, 0, 0, 0, 0, $width, $height, $widthOrig, $heightOrig);

  		if ($process == false) {
  			OC_Log::write('core', __METHOD__.'(): Error resampling process image '.$width.'x'.$height, OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  		imagedestroy($this->resource);
  		$this->resource = $process;
  		return true;
  	}
  
  	/**
  	* @brief Crops the image to the middle square. If the image is already square it just returns.
  	* @param int maximum size for the result (optional)
  	* @returns bool for success or failure
  	*/
  	public function centerCrop($size=0) {
  		if(!$this->valid()) {
  			OC_Log::write('core', 'OC_Image->centerCrop, No image loaded', OC_Log::ERROR);
  			return false;
  		}

  		$widthOrig=imageSX($this->resource);
  		$heightOrig=imageSY($this->resource);
  		if($widthOrig === $heightOrig and $size==0) {

  			return true;
  		}

  		$ratioOrig = $widthOrig/$heightOrig;
  		$width = $height = min($widthOrig, $heightOrig);

  		if ($ratioOrig > 1) {
  			$x = ($widthOrig/2) - ($width/2);

  			$y = 0;
  		} else {

  			$y = ($heightOrig/2) - ($height/2);

  			$x = 0;
  		}
  		if($size>0) {
  			$targetWidth=$size;
  			$targetHeight=$size;
  		}else{
  			$targetWidth=$width;
  			$targetHeight=$height;
  		}
  		$process = imagecreatetruecolor($targetWidth, $targetHeight);
  		if ($process == false) {
  			OC_Log::write('core', 'OC_Image->centerCrop. Error creating true color image', OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  
  		// preserve transparency

  		if($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) {

  			imagecolortransparent($process, imagecolorallocatealpha($process, 0, 0, 0, 127));
  			imagealphablending($process, false);
  			imagesavealpha($process, true);
  		}
  
  		imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $targetWidth, $targetHeight, $width, $height);
  		if ($process == false) {
  			OC_Log::write('core',
  				'OC_Image->centerCrop. Error resampling process image '.$width.'x'.$height,
  				OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  		imagedestroy($this->resource);
  		$this->resource = $process;
  		return true;
  	}
  
  	/**
  	* @brief Crops the image from point $x$y with dimension $wx$h.
  	* @param $x Horizontal position
  	* @param $y Vertical position
  	* @param $w Width
  	* @param $h Height
  	* @returns bool for success or failure
  	*/
  	public function crop($x, $y, $w, $h) {
  		if(!$this->valid()) {
  			OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR);
  			return false;
  		}
  		$process = imagecreatetruecolor($w, $h);
  		if ($process == false) {
  			OC_Log::write('core', __METHOD__.'(): Error creating true color image', OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  		imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $w, $h, $w, $h);
  		if ($process == false) {
  			OC_Log::write('core', __METHOD__.'(): Error resampling process image '.$w.'x'.$h, OC_Log::ERROR);
  			imagedestroy($process);
  			return false;
  		}
  		imagedestroy($this->resource);
  		$this->resource = $process;
  		return true;
  	}
  
  	/**
  	 * @brief Resizes the image to fit within a boundry while preserving ratio.
  	 * @param $maxWidth
  	 * @param $maxHeight
  	 * @returns bool
  	 */
  	public function fitIn($maxWidth, $maxHeight) {
  		if(!$this->valid()) {
  			OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR);
  			return false;
  		}

  		$widthOrig=imageSX($this->resource);
  		$heightOrig=imageSY($this->resource);
  		$ratio = $widthOrig/$heightOrig;

  
  		$newWidth = min($maxWidth, $ratio*$maxHeight);
  		$newHeight = min($maxHeight, $maxWidth/$ratio);
  
  		$this->preciseResize(round($newWidth), round($newHeight));
  		return true;
  	}
  
  	public function destroy() {
  		if($this->valid()) {
  			imagedestroy($this->resource);
  		}
  		$this->resource=null;
  	}
  
  	public function __destruct() {
  		$this->destroy();
  	}
  }
  if ( ! function_exists( 'imagebmp') ) {
  	/**
  	 * Output a BMP image to either the browser or a file
  	 * @link http://www.ugia.cn/wp-data/imagebmp.php
  	 * @author legend <legendsky@hotmail.com>
  	 * @link http://www.programmierer-forum.de/imagebmp-gute-funktion-gefunden-t143716.htm
  	 * @author mgutt <marc@gutt.it>
  	 * @version 1.00
  	 * @param resource $image
  	 * @param string $filename [optional] <p>The path to save the file to.</p>
  	 * @param int $bit [optional] <p>Bit depth, (default is 24).</p>
  	 * @param int $compression [optional]
  	 * @return bool <b>TRUE</b> on success or <b>FALSE</b> on failure.
  	 */

  	function imagebmp($im, $fileName='', $bit=24, $compression=0) {

  		if (!in_array($bit, array(1, 4, 8, 16, 24, 32))) {
  			$bit = 24;
  		}
  		else if ($bit == 32) {
  			$bit = 24;
  		}
  		$bits = pow(2, $bit);
  		imagetruecolortopalette($im, true, $bits);
  		$width = imagesx($im);
  		$height = imagesy($im);

  		$colorsNum = imagecolorstotal($im);
  		$rgbQuad = '';

  		if ($bit <= 8) {

  			for ($i = 0; $i < $colorsNum; $i++) {

  				$colors = imagecolorsforindex($im, $i);

  				$rgbQuad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0";

  			}

  			$bmpData = '';

  			if ($compression == 0 || $bit < 8) {
  				$compression = 0;
  				$extra = '';
  				$padding = 4 - ceil($width / (8 / $bit)) % 4;
  				if ($padding % 4 != 0) {
  					$extra = str_repeat("\0", $padding);
  				}
  				for ($j = $height - 1; $j >= 0; $j --) {
  					$i = 0;
  					while ($i < $width) {
  						$bin = 0;
  						$limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0;
  						for ($k = 8 - $bit; $k >= $limit; $k -= $bit) {
  							$index = imagecolorat($im, $i, $j);
  							$bin |= $index << $k;
  							$i++;
  						}

  						$bmpData .= chr($bin);

  					}

  					$bmpData .= $extra;

  				}
  			}
  			// RLE8
  			else if ($compression == 1 && $bit == 8) {
  				for ($j = $height - 1; $j >= 0; $j--) {

  					$lastIndex = "\0";
  					$sameNum = 0;

  					for ($i = 0; $i <= $width; $i++) {
  						$index = imagecolorat($im, $i, $j);

  						if ($index !== $lastIndex || $sameNum > 255) {
  							if ($sameNum != 0) {
  								$bmpData .= chr($same_num) . chr($lastIndex);

  							}

  							$lastIndex = $index;
  							$sameNum = 1;

  						}
  						else {

  							$sameNum++;

  						}
  					}

  					$bmpData .= "\0\0";

  				}

  				$bmpData .= "\0\1";

  			}

  			$sizeQuad = strlen($rgbQuad);
  			$sizeData = strlen($bmpData);

  		}
  		else {
  			$extra = '';
  			$padding = 4 - ($width * ($bit / 8)) % 4;
  			if ($padding % 4 != 0) {
  				$extra = str_repeat("\0", $padding);
  			}

  			$bmpData = '';

  			for ($j = $height - 1; $j >= 0; $j--) {
  				for ($i = 0; $i < $width; $i++) {
  					$index  = imagecolorat($im, $i, $j);
  					$colors = imagecolorsforindex($im, $index);
  					if ($bit == 16) {
  						$bin = 0 << $bit;
  						$bin |= ($colors['red'] >> 3) << 10;
  						$bin |= ($colors['green'] >> 3) << 5;
  						$bin |= $colors['blue'] >> 3;

  						$bmpData .= pack("v", $bin);

  					}
  					else {

  						$bmpData .= pack("c*", $colors['blue'], $colors['green'], $colors['red']);

  					}
  				}

  				$bmpData .= $extra;

  			}

  			$sizeQuad = 0;
  			$sizeData = strlen($bmpData);
  			$colorsNum = 0;
  		}
  		$fileHeader = 'BM' . pack('V3', 54 + $sizeQuad + $sizeData, 0, 54 + $sizeQuad);
  		$infoHeader = pack('V3v2V*', 0x28, $width, $height, 1, $bit, $compression, $sizeData, 0, 0, $colorsNum, 0);
  		if ($fileName != '') {
  			$fp = fopen($fileName, 'wb');
  			fwrite($fp, $fileHeader . $infoHeader . $rgbQuad . $bmpData);

  			fclose($fp);
  			return true;
  		}

  		echo $fileHeader . $infoHeader. $rgbQuad . $bmpData;

  		return true;
  	}
  }
  
  if ( ! function_exists( 'exif_imagetype' ) ) {
  	/**
  	 * Workaround if exif_imagetype does not exist
  	 * @link http://www.php.net/manual/en/function.exif-imagetype.php#80383
  	 * @param string $filename
  	 * @return string|boolean
  	 */

  	function exif_imagetype ( $fileName ) {
  		if ( ( $info = getimagesize( $fileName ) ) !== false ) {

  			return $info[2];
  		}
  		return false;
  	}
  }