ci-bonfire / Sprint

system/libraries/Image_lib.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 49 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Image Manipulation class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Image_lib
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/image_lib.html
 */
class CI_Image_lib {

	/**
	 * PHP extension/library to use for image manipulation
	 * Can be: imagemagick, netpbm, gd, gd2
	 *
	 * @var string
	 */
	public $image_library		= 'gd2';

	/**
	 * Path to the graphic library (if applicable)
	 *
	 * @var string
	 */
	public $library_path		= '';

	/**
	 * Whether to send to browser or write to disk
	 *
	 * @var bool
	 */
	public $dynamic_output		= FALSE;

	/**
	 * Path to original image
	 *
	 * @var string
	 */
	public $source_image		= '';

	/**
	 * Path to the modified image
	 *
	 * @var string
	 */
	public $new_image		= '';

	/**
	 * Image width
	 *
	 * @var int
	 */
	public $width			= '';

	/**
	 * Image height
	 *
	 * @var int
	 */
	public $height			= '';

	/**
	 * Quality percentage of new image
	 *
	 * @var int
	 */
	public $quality			= 90;

	/**
	 * Whether to create a thumbnail
	 *
	 * @var bool
	 */
	public $create_thumb		= FALSE;

	/**
	 * String to add to thumbnail version of image
	 *
	 * @var string
	 */
	public $thumb_marker		= '_thumb';

	/**
	 * Whether to maintain aspect ratio when resizing or use hard values
	 *
	 * @var bool
	 */
	public $maintain_ratio		= TRUE;

	/**
	 * auto, height, or width.  Determines what to use as the master dimension
	 *
	 * @var string
	 */
	public $master_dim		= 'auto';

	/**
	 * Angle at to rotate image
	 *
	 * @var string
	 */
	public $rotation_angle		= '';

	/**
	 * X Coordinate for manipulation of the current image
	 *
	 * @var int
	 */
	public $x_axis			= '';

	/**
	 * Y Coordinate for manipulation of the current image
	 *
	 * @var int
	 */
	public $y_axis			= '';

	// --------------------------------------------------------------------------
	// Watermark Vars
	// --------------------------------------------------------------------------

	/**
	 * Watermark text if graphic is not used
	 *
	 * @var string
	 */
	public $wm_text			= '';

	/**
	 * Type of watermarking.  Options:  text/overlay
	 *
	 * @var string
	 */
	public $wm_type			= 'text';

	/**
	 * Default transparency for watermark
	 *
	 * @var int
	 */
	public $wm_x_transp		= 4;

	/**
	 * Default transparency for watermark
	 *
	 * @var int
	 */
	public $wm_y_transp		= 4;

	/**
	 * Watermark image path
	 *
	 * @var string
	 */
	public $wm_overlay_path		= '';

	/**
	 * TT font
	 *
	 * @var string
	 */
	public $wm_font_path		= '';

	/**
	 * Font size (different versions of GD will either use points or pixels)
	 *
	 * @var int
	 */
	public $wm_font_size		= 17;

	/**
	 * Vertical alignment:   T M B
	 *
	 * @var string
	 */
	public $wm_vrt_alignment	= 'B';

	/**
	 * Horizontal alignment: L R C
	 *
	 * @var string
	 */
	public $wm_hor_alignment	= 'C';

	/**
	 * Padding around text
	 *
	 * @var int
	 */
	public $wm_padding			= 0;

	/**
	 * Lets you push text to the right
	 *
	 * @var int
	 */
	public $wm_hor_offset		= 0;

	/**
	 * Lets you push text down
	 *
	 * @var int
	 */
	public $wm_vrt_offset		= 0;

	/**
	 * Text color
	 *
	 * @var string
	 */
	protected $wm_font_color	= '#ffffff';

	/**
	 * Dropshadow color
	 *
	 * @var string
	 */
	protected $wm_shadow_color	= '';

	/**
	 * Dropshadow distance
	 *
	 * @var int
	 */
	public $wm_shadow_distance	= 2;

	/**
	 * Image opacity: 1 - 100  Only works with image
	 *
	 * @var int
	 */
	public $wm_opacity		= 50;

	// --------------------------------------------------------------------------
	// Private Vars
	// --------------------------------------------------------------------------

	/**
	 * Source image folder
	 *
	 * @var string
	 */
	public $source_folder		= '';

	/**
	 * Destination image folder
	 *
	 * @var string
	 */
	public $dest_folder		= '';

	/**
	 * Image mime-type
	 *
	 * @var string
	 */
	public $mime_type		= '';

	/**
	 * Original image width
	 *
	 * @var int
	 */
	public $orig_width		= '';

	/**
	 * Original image height
	 *
	 * @var int
	 */
	public $orig_height		= '';

	/**
	 * Image format
	 *
	 * @var string
	 */
	public $image_type		= '';

	/**
	 * Size of current image
	 *
	 * @var string
	 */
	public $size_str		= '';

	/**
	 * Full path to source image
	 *
	 * @var string
	 */
	public $full_src_path		= '';

	/**
	 * Full path to destination image
	 *
	 * @var string
	 */
	public $full_dst_path		= '';

	/**
	 * File permissions
	 *
	 * @var	int
	 */
	public $file_permissions = 0644;

	/**
	 * Name of function to create image
	 *
	 * @var string
	 */
	public $create_fnc		= 'imagecreatetruecolor';

	/**
	 * Name of function to copy image
	 *
	 * @var string
	 */
	public $copy_fnc		= 'imagecopyresampled';

	/**
	 * Error messages
	 *
	 * @var array
	 */
	public $error_msg		= array();

	/**
	 * Whether to have a drop shadow on watermark
	 *
	 * @var bool
	 */
	protected $wm_use_drop_shadow	= FALSE;

	/**
	 * Whether to use truetype fonts
	 *
	 * @var bool
	 */
	public $wm_use_truetype	= FALSE;

	/**
	 * Initialize Image Library
	 *
	 * @param	array	$props
	 * @return	void
	 */
	public function __construct($props = array())
	{
		if (count($props) > 0)
		{
			$this->initialize($props);
		}

		log_message('info', 'Image Lib Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize image properties
	 *
	 * Resets values in case this class is used in a loop
	 *
	 * @return	void
	 */
	public function clear()
	{
		$props = array('thumb_marker', 'library_path', 'source_image', 'new_image', 'width', 'height', 'rotation_angle', 'x_axis', 'y_axis', 'wm_text', 'wm_overlay_path', 'wm_font_path', 'wm_shadow_color', 'source_folder', 'dest_folder', 'mime_type', 'orig_width', 'orig_height', 'image_type', 'size_str', 'full_src_path', 'full_dst_path');

		foreach ($props as $val)
		{
			$this->$val = '';
		}

		$this->image_library 		= 'gd2';
		$this->dynamic_output 		= FALSE;
		$this->quality 				= 90;
		$this->create_thumb 		= FALSE;
		$this->thumb_marker 		= '_thumb';
		$this->maintain_ratio 		= TRUE;
		$this->master_dim 			= 'auto';
		$this->wm_type 				= 'text';
		$this->wm_x_transp 			= 4;
		$this->wm_y_transp 			= 4;
		$this->wm_font_size 		= 17;
		$this->wm_vrt_alignment 	= 'B';
		$this->wm_hor_alignment 	= 'C';
		$this->wm_padding 			= 0;
		$this->wm_hor_offset 		= 0;
		$this->wm_vrt_offset 		= 0;
		$this->wm_font_color		= '#ffffff';
		$this->wm_shadow_distance 	= 2;
		$this->wm_opacity 			= 50;
		$this->create_fnc 			= 'imagecreatetruecolor';
		$this->copy_fnc 			= 'imagecopyresampled';
		$this->error_msg 			= array();
		$this->wm_use_drop_shadow 	= FALSE;
		$this->wm_use_truetype 		= FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * initialize image preferences
	 *
	 * @param	array
	 * @return	bool
	 */
	public function initialize($props = array())
	{
		// Convert array elements into class variables
		if (count($props) > 0)
		{
			foreach ($props as $key => $val)
			{
				if (property_exists($this, $key))
				{
					if (in_array($key, array('wm_font_color', 'wm_shadow_color')))
					{
						if (preg_match('/^#?([0-9a-f]{3}|[0-9a-f]{6})$/i', $val, $matches))
						{
							/* $matches[1] contains our hex color value, but it might be
							 * both in the full 6-length format or the shortened 3-length
							 * value.
							 * We'll later need the full version, so we keep it if it's
							 * already there and if not - we'll convert to it. We can
							 * access string characters by their index as in an array,
							 * so we'll do that and use concatenation to form the final
							 * value:
							 */
							$val = (strlen($matches[1]) === 6)
								? '#'.$matches[1]
								: '#'.$matches[1][0].$matches[1][0].$matches[1][1].$matches[1][1].$matches[1][2].$matches[1][2];
						}
						else
						{
							continue;
						}
					}

					$this->$key = $val;
				}
			}
		}

		// Is there a source image? If not, there's no reason to continue
		if ($this->source_image === '')
		{
			$this->set_error('imglib_source_image_required');
			return FALSE;
		}

		/* Is getimagesize() available?
		 *
		 * We use it to determine the image properties (width/height).
		 * Note: We need to figure out how to determine image
		 * properties using ImageMagick and NetPBM
		 */
		if ( ! function_exists('getimagesize'))
		{
			$this->set_error('imglib_gd_required_for_props');
			return FALSE;
		}

		$this->image_library = strtolower($this->image_library);

		/* Set the full server path
		 *
		 * The source image may or may not contain a path.
		 * Either way, we'll try use realpath to generate the
		 * full server path in order to more reliably read it.
		 */
		if (($full_source_path = realpath($this->source_image)) !== FALSE)
		{
			$full_source_path = str_replace('\\', '/', $full_source_path);
		}
		else
		{
			$full_source_path = $this->source_image;
		}

		$x = explode('/', $full_source_path);
		$this->source_image = end($x);
		$this->source_folder = str_replace($this->source_image, '', $full_source_path);

		// Set the Image Properties
		if ( ! $this->get_image_properties($this->source_folder.$this->source_image))
		{
			return FALSE;
		}

		/*
		 * Assign the "new" image name/path
		 *
		 * If the user has set a "new_image" name it means
		 * we are making a copy of the source image. If not
		 * it means we are altering the original. We'll
		 * set the destination filename and path accordingly.
		 */
		if ($this->new_image === '')
		{
			$this->dest_image = $this->source_image;
			$this->dest_folder = $this->source_folder;
		}
		elseif (strpos($this->new_image, '/') === FALSE)
		{
			$this->dest_folder = $this->source_folder;
			$this->dest_image = $this->new_image;
		}
		else
		{
			if (strpos($this->new_image, '/') === FALSE && strpos($this->new_image, '\\') === FALSE)
			{
				$full_dest_path = str_replace('\\', '/', realpath($this->new_image));
			}
			else
			{
				$full_dest_path = $this->new_image;
			}

			// Is there a file name?
			if ( ! preg_match('#\.(jpg|jpeg|gif|png)$#i', $full_dest_path))
			{
				$this->dest_folder = $full_dest_path.'/';
				$this->dest_image = $this->source_image;
			}
			else
			{
				$x = explode('/', $full_dest_path);
				$this->dest_image = end($x);
				$this->dest_folder = str_replace($this->dest_image, '', $full_dest_path);
			}
		}

		/* Compile the finalized filenames/paths
		 *
		 * We'll create two master strings containing the
		 * full server path to the source image and the
		 * full server path to the destination image.
		 * We'll also split the destination image name
		 * so we can insert the thumbnail marker if needed.
		 */
		if ($this->create_thumb === FALSE OR $this->thumb_marker === '')
		{
			$this->thumb_marker = '';
		}

		$xp = $this->explode_name($this->dest_image);

		$filename = $xp['name'];
		$file_ext = $xp['ext'];

		$this->full_src_path = $this->source_folder.$this->source_image;
		$this->full_dst_path = $this->dest_folder.$filename.$this->thumb_marker.$file_ext;

		/* Should we maintain image proportions?
		 *
		 * When creating thumbs or copies, the target width/height
		 * might not be in correct proportion with the source
		 * image's width/height. We'll recalculate it here.
		 */
		if ($this->maintain_ratio === TRUE && ($this->width !== 0 OR $this->height !== 0))
		{
			$this->image_reproportion();
		}

		/* Was a width and height specified?
		 *
		 * If the destination width/height was not submitted we
		 * will use the values from the actual file
		 */
		if ($this->width === '')
		{
			$this->width = $this->orig_width;
		}

		if ($this->height === '')
		{
			$this->height = $this->orig_height;
		}

		// Set the quality
		$this->quality = trim(str_replace('%', '', $this->quality));

		if ($this->quality === '' OR $this->quality === 0 OR ! ctype_digit($this->quality))

The strict comparison === seems to always evaluate to false as the types of $this->quality (string) and 0 (integer) can never be identical. Maybe you want to use a loose comparison == instead?

		{
			$this->quality = 90;
		}

		// Set the x/y coordinates
		is_numeric($this->x_axis) OR $this->x_axis = 0;
		is_numeric($this->y_axis) OR $this->y_axis = 0;

		// Watermark-related Stuff...
		if ($this->wm_overlay_path !== '')
		{
			$this->wm_overlay_path = str_replace('\\', '/', realpath($this->wm_overlay_path));
		}

		if ($this->wm_shadow_color !== '')
		{
			$this->wm_use_drop_shadow = TRUE;
		}
		elseif ($this->wm_use_drop_shadow === TRUE && $this->wm_shadow_color === '')
		{
			$this->wm_use_drop_shadow = FALSE;
		}

		if ($this->wm_font_path !== '')
		{
			$this->wm_use_truetype = TRUE;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Resize
	 *
	 * This is a wrapper function that chooses the proper
	 * resize function based on the protocol specified
	 *
	 * @return	bool
	 */
	public function resize()
	{
		$protocol = ($this->image_library === 'gd2') ? 'image_process_gd' : 'image_process_'.$this->image_library;
		return $this->$protocol('resize');
	}

	// --------------------------------------------------------------------

	/**
	 * Image Crop
	 *
	 * This is a wrapper function that chooses the proper
	 * cropping function based on the protocol specified
	 *
	 * @return	bool
	 */
	public function crop()
	{
		$protocol = ($this->image_library === 'gd2') ? 'image_process_gd' : 'image_process_'.$this->image_library;
		return $this->$protocol('crop');
	}

	// --------------------------------------------------------------------

	/**
	 * Image Rotate
	 *
	 * This is a wrapper function that chooses the proper
	 * rotation function based on the protocol specified
	 *
	 * @return	bool
	 */
	public function rotate()
	{
		// Allowed rotation values
		$degs = array(90, 180, 270, 'vrt', 'hor');

		if ($this->rotation_angle === '' OR ! in_array($this->rotation_angle, $degs))
		{
			$this->set_error('imglib_rotation_angle_required');
			return FALSE;
		}

		// Reassign the width and height
		if ($this->rotation_angle === 90 OR $this->rotation_angle === 270)

The strict comparison === seems to always evaluate to false as the types of $this->rotation_angle (string) and 90 (integer) can never be identical. Maybe you want to use a loose comparison == instead?

		{
			$this->width	= $this->orig_height;
			$this->height	= $this->orig_width;
		}
		else
		{
			$this->width	= $this->orig_width;
			$this->height	= $this->orig_height;
		}

		// Choose resizing function
		if ($this->image_library === 'imagemagick' OR $this->image_library === 'netpbm')
		{
			$protocol = 'image_process_'.$this->image_library;
			return $this->$protocol('rotate');
		}

		return ($this->rotation_angle === 'hor' OR $this->rotation_angle === 'vrt')
			? $this->image_mirror_gd()
			: $this->image_rotate_gd();
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using GD/GD2
	 *
	 * This function will resize or crop
	 *
	 * @param	string
	 * @return	bool
	 */
	public function image_process_gd($action = 'resize')
	{
		$v2_override = FALSE;

		// If the target width/height match the source, AND if the new file name is not equal to the old file name
		// we'll simply make a copy of the original with the new name... assuming dynamic rendering is off.
		if ($this->dynamic_output === FALSE && $this->orig_width === $this->width && $this->orig_height === $this->height)
		{
			if ($this->source_image !== $this->new_image && @copy($this->full_src_path, $this->full_dst_path))
			{
				chmod($this->full_dst_path, $this->file_permissions);
			}

			return TRUE;
		}

		// Let's set up our values based on the action
		if ($action === 'crop')
		{
			// Reassign the source width/height if cropping
			$this->orig_width  = $this->width;
			$this->orig_height = $this->height;

			// GD 2.0 has a cropping bug so we'll test for it
			if ($this->gd_version() !== FALSE)
			{
				$gd_version = str_replace('0', '', $this->gd_version());
				$v2_override = ($gd_version == 2);
			}
		}
		else
		{
			// If resizing the x/y axis must be zero
			$this->x_axis = 0;
			$this->y_axis = 0;
		}

		// Create the image handle
		if ( ! ($src_img = $this->image_create_gd()))
		{
			return FALSE;
		}

		/* Create the image
		 *
		 * Old conditional which users report cause problems with shared GD libs who report themselves as "2.0 or greater"
		 * it appears that this is no longer the issue that it was in 2004, so we've removed it, retaining it in the comment
		 * below should that ever prove inaccurate.
		 *
		 * if ($this->image_library === 'gd2' && function_exists('imagecreatetruecolor') && $v2_override === FALSE)
		 */
		if ($this->image_library === 'gd2' && function_exists('imagecreatetruecolor'))
		{
			$create	= 'imagecreatetruecolor';
			$copy	= 'imagecopyresampled';
		}
		else
		{
			$create	= 'imagecreate';
			$copy	= 'imagecopyresized';
		}

		$dst_img = $create($this->width, $this->height);

		if ($this->image_type === 3) // png we can actually preserve transparency

The strict comparison === seems to always evaluate to false as the types of $this->image_type (string) and 3 (integer) can never be identical. Maybe you want to use a loose comparison == instead?

		{
			imagealphablending($dst_img, FALSE);
			imagesavealpha($dst_img, TRUE);
		}

		$copy($dst_img, $src_img, 0, 0, $this->x_axis, $this->y_axis, $this->width, $this->height, $this->orig_width, $this->orig_height);

		// Show the image
		if ($this->dynamic_output === TRUE)
		{
			$this->image_display_gd($dst_img);
		}
		elseif ( ! $this->image_save_gd($dst_img)) // Or save it
		{
			return FALSE;
		}

		// Kill the file handles
		imagedestroy($dst_img);
		imagedestroy($src_img);

		chmod($this->full_dst_path, $this->file_permissions);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using ImageMagick
	 *
	 * This function will resize, crop or rotate
	 *
	 * @param	string
	 * @return	bool
	 */
	public function image_process_imagemagick($action = 'resize')
	{
		// Do we have a vaild library path?
		if ($this->library_path === '')
		{
			$this->set_error('imglib_libpath_invalid');
			return FALSE;
		}

		if ( ! preg_match('/convert$/i', $this->library_path))
		{
			$this->library_path = rtrim($this->library_path, '/').'/convert';
		}

		// Execute the command
		$cmd = $this->library_path.' -quality '.$this->quality;

		if ($action === 'crop')
		{
			$cmd .= ' -crop '.$this->width.'x'.$this->height.'+'.$this->x_axis.'+'.$this->y_axis.' "'.$this->full_src_path.'" "'.$this->full_dst_path .'" 2>&1';
		}
		elseif ($action === 'rotate')
		{
			$angle = ($this->rotation_angle === 'hor' OR $this->rotation_angle === 'vrt')
					? '-flop' : '-rotate '.$this->rotation_angle;

			$cmd .= ' '.$angle.' "'.$this->full_src_path.'" "'.$this->full_dst_path.'" 2>&1';
		}
		else // Resize
		{
			if($this->maintain_ratio === TRUE)
			{
				$cmd .= ' -resize '.$this->width.'x'.$this->height.' "'.$this->full_src_path.'" "'.$this->full_dst_path.'" 2>&1';
			}
			else
			{
				$cmd .= ' -resize '.$this->width.'x'.$this->height.'\! "'.$this->full_src_path.'" "'.$this->full_dst_path.'" 2>&1';
			}
		}

		$retval = 1;
		// exec() might be disabled
		if (function_usable('exec'))
		{
			@exec($cmd, $output, $retval);
		}

		// Did it work?
		if ($retval > 0)
		{
			$this->set_error('imglib_image_process_failed');
			return FALSE;
		}

		chmod($this->full_dst_path, $this->file_permissions);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Process Using NetPBM
	 *
	 * This function will resize, crop or rotate
	 *
	 * @param	string
	 * @return	bool
	 */
	public function image_process_netpbm($action = 'resize')
	{
		if ($this->library_path === '')
		{
			$this->set_error('imglib_libpath_invalid');
			return FALSE;
		}

		// Build the resizing command
		switch ($this->image_type)
		{
			case 1 :
				$cmd_in		= 'giftopnm';
				$cmd_out	= 'ppmtogif';
				break;
			case 2 :
				$cmd_in		= 'jpegtopnm';
				$cmd_out	= 'ppmtojpeg';
				break;
			case 3 :
				$cmd_in		= 'pngtopnm';
				$cmd_out	= 'ppmtopng';
				break;
		}

		if ($action === 'crop')
		{
			$cmd_inner = 'pnmcut -left '.$this->x_axis.' -top '.$this->y_axis.' -width '.$this->width.' -height '.$this->height;
		}
		elseif ($action === 'rotate')
		{
			switch ($this->rotation_angle)
			{
				case 90:	$angle = 'r270';

The case body in a switch statement must start on the line following the statement.

					break;
				case 180:	$angle = 'r180';

The case body in a switch statement must start on the line following the statement.

					break;
				case 270:	$angle = 'r90';

The case body in a switch statement must start on the line following the statement.

					break;
				case 'vrt':	$angle = 'tb';

The case body in a switch statement must start on the line following the statement.

					break;
				case 'hor':	$angle = 'lr';

The case body in a switch statement must start on the line following the statement.

					break;
			}

			$cmd_inner = 'pnmflip -'.$angle.' ';
		}
		else // Resize
		{
			$cmd_inner = 'pnmscale -xysize '.$this->width.' '.$this->height;
		}

		$cmd = $this->library_path.$cmd_in.' '.$this->full_src_path.' | '.$cmd_inner.' | '.$cmd_out.' > '.$this->dest_folder.'netpbm.tmp';

		$retval = 1;
		// exec() might be disabled
		if (function_usable('exec'))
		{
			@exec($cmd, $output, $retval);
		}

		// Did it work?
		if ($retval > 0)
		{
			$this->set_error('imglib_image_process_failed');
			return FALSE;
		}

		// With NetPBM we have to create a temporary image.
		// If you try manipulating the original it fails so
		// we have to rename the temp file.
		copy($this->dest_folder.'netpbm.tmp', $this->full_dst_path);
		unlink($this->dest_folder.'netpbm.tmp');
		chmod($this->full_dst_path, $this->file_permissions);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Rotate Using GD
	 *
	 * @return	bool
	 */
	public function image_rotate_gd()
	{
		// Create the image handle
		if ( ! ($src_img = $this->image_create_gd()))
		{
			return FALSE;
		}

		// Set the background color
		// This won't work with transparent PNG files so we are
		// going to have to figure out how to determine the color
		// of the alpha channel in a future release.

		$white = imagecolorallocate($src_img, 255, 255, 255);

		// Rotate it!
		$dst_img = imagerotate($src_img, $this->rotation_angle, $white);

		// Show the image
		if ($this->dynamic_output === TRUE)
		{
			$this->image_display_gd($dst_img);
		}
		elseif ( ! $this->image_save_gd($dst_img)) // ... or save it
		{
			return FALSE;
		}

		// Kill the file handles
		imagedestroy($dst_img);
		imagedestroy($src_img);

		chmod($this->full_dst_path, $this->file_permissions);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Mirror Image using GD
	 *
	 * This function will flip horizontal or vertical
	 *
	 * @return	bool
	 */
	public function image_mirror_gd()
	{
		if ( ! $src_img = $this->image_create_gd())
		{
			return FALSE;
		}

		$width  = $this->orig_width;
		$height = $this->orig_height;

		if ($this->rotation_angle === 'hor')
		{
			for ($i = 0; $i < $height; $i++)
			{
				$left = 0;
				$right = $width - 1;

				while ($left < $right)
				{
					$cl = imagecolorat($src_img, $left, $i);
					$cr = imagecolorat($src_img, $right, $i);

					imagesetpixel($src_img, $left, $i, $cr);
					imagesetpixel($src_img, $right, $i, $cl);

					$left++;
					$right--;
				}
			}
		}
		else
		{
			for ($i = 0; $i < $width; $i++)
			{
				$top = 0;
				$bottom = $height - 1;

				while ($top < $bottom)
				{
					$ct = imagecolorat($src_img, $i, $top);
					$cb = imagecolorat($src_img, $i, $bottom);

					imagesetpixel($src_img, $i, $top, $cb);
					imagesetpixel($src_img, $i, $bottom, $ct);

					$top++;
					$bottom--;
				}
			}
		}

		// Show the image
		if ($this->dynamic_output === TRUE)
		{
			$this->image_display_gd($src_img);
		}
		elseif ( ! $this->image_save_gd($src_img)) // ... or save it
		{
			return FALSE;
		}

		// Kill the file handles
		imagedestroy($src_img);

		chmod($this->full_dst_path, $this->file_permissions);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Image Watermark
	 *
	 * This is a wrapper function that chooses the type
	 * of watermarking based on the specified preference.
	 *
	 * @return	bool
	 */
	public function watermark()
	{
		return ($this->wm_type === 'overlay') ? $this->overlay_watermark() : $this->text_watermark();
	}

	// --------------------------------------------------------------------

	/**
	 * Watermark - Graphic Version
	 *
	 * @return	bool
	 */
	public function overlay_watermark()
	{
		if ( ! function_exists('imagecolortransparent'))
		{
			$this->set_error('imglib_gd_required');
			return FALSE;
		}

		// Fetch source image properties
		$this->get_image_properties();

		// Fetch watermark image properties
		$props		= $this->get_image_properties($this->wm_overlay_path, TRUE);
		$wm_img_type	= $props['image_type'];
		$wm_width	= $props['width'];
		$wm_height	= $props['height'];

		// Create two image resources
		$wm_img  = $this->image_create_gd($this->wm_overlay_path, $wm_img_type);
		$src_img = $this->image_create_gd($this->full_src_path);

		// Reverse the offset if necessary
		// When the image is positioned at the bottom
		// we don't want the vertical offset to push it
		// further down. We want the reverse, so we'll
		// invert the offset. Same with the horizontal
		// offset when the image is at the right

		$this->wm_vrt_alignment = strtoupper($this->wm_vrt_alignment[0]);
		$this->wm_hor_alignment = strtoupper($this->wm_hor_alignment[0]);

		if ($this->wm_vrt_alignment === 'B')
			$this->wm_vrt_offset = $this->wm_vrt_offset * -1;

		if ($this->wm_hor_alignment === 'R')
			$this->wm_hor_offset = $this->wm_hor_offset * -1;

		// Set the base x and y axis values
		$x_axis = $this->wm_hor_offset + $this->wm_padding;
		$y_axis = $this->wm_vrt_offset + $this->wm_padding;

		// Set the vertical position
		if ($this->wm_vrt_alignment === 'M')
		{
			$y_axis += ($this->orig_height / 2) - ($wm_height / 2);
		}
		elseif ($this->wm_vrt_alignment === 'B')
		{
			$y_axis += $this->orig_height - $wm_height;
		}

		// Set the horizontal position
		if ($this->wm_hor_alignment === 'C')
		{
			$x_axis += ($this->orig_width / 2) - ($wm_width / 2);
		}
		elseif ($this->wm_hor_alignment === 'R')
		{
			$x_axis += $this->orig_width - $wm_width;
		}

		// Build the finalized image
		if ($wm_img_type === 3 && function_exists('imagealphablending'))
		{
			@imagealphablending($src_img, TRUE);
		}

		// Set RGB values for text and shadow
		$rgba = imagecolorat($wm_img, $this->wm_x_transp, $this->wm_y_transp);
		$alpha = ($rgba & 0x7F000000) >> 24;

		// make a best guess as to whether we're dealing with an image with alpha transparency or no/binary transparency
		if ($alpha > 0)
		{
			// copy the image directly, the image's alpha transparency being the sole determinant of blending
			imagecopy($src_img, $wm_img, $x_axis, $y_axis, 0, 0, $wm_width, $wm_height);
		}
		else
		{
			// set our RGB value from above to be transparent and merge the images with the specified opacity
			imagecolortransparent($wm_img, imagecolorat($wm_img, $this->wm_x_transp, $this->wm_y_transp));
			imagecopymerge($src_img, $wm_img, $x_axis, $y_axis, 0, 0, $wm_width, $wm_height, $this->wm_opacity);
		}

		// We can preserve transparency for PNG images
		if ($this->image_type === 3)

The strict comparison === seems to always evaluate to false as the types of $this->image_type (string) and 3 (integer) can never be identical. Maybe you want to use a loose comparison == instead?

		{
			imagealphablending($src_img, FALSE);
			imagesavealpha($src_img, TRUE);
		}

		// Output the image
		if ($this->dynamic_output === TRUE)
		{
			$this->image_display_gd($src_img);
		}
		elseif ( ! $this->image_save_gd($src_img)) // ... or save it
		{
			return FALSE;
		}

		imagedestroy($src_img);
		imagedestroy($wm_img);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Watermark - Text Version
	 *
	 * @return	bool
	 */
	public function text_watermark()
	{
		if ( ! ($src_img = $this->image_create_gd()))
		{
			return FALSE;
		}

		if ($this->wm_use_truetype === TRUE && ! file_exists($this->wm_font_path))
		{
			$this->set_error('imglib_missing_font');
			return FALSE;
		}

		// Fetch source image properties
		$this->get_image_properties();

		// Reverse the vertical offset
		// When the image is positioned at the bottom
		// we don't want the vertical offset to push it
		// further down. We want the reverse, so we'll
		// invert the offset. Note: The horizontal
		// offset flips itself automatically

		if ($this->wm_vrt_alignment === 'B')
		{
			$this->wm_vrt_offset = $this->wm_vrt_offset * -1;
		}

		if ($this->wm_hor_alignment === 'R')
		{
			$this->wm_hor_offset = $this->wm_hor_offset * -1;
		}

		// Set font width and height
		// These are calculated differently depending on
		// whether we are using the true type font or not
		if ($this->wm_use_truetype === TRUE)
		{
			if (empty($this->wm_font_size))
			{
				$this->wm_font_size = 17;
			}

			if (function_exists('imagettfbbox'))
			{
				$temp = imagettfbbox($this->wm_font_size, 0, $this->wm_font_path, $this->wm_text);
				$temp = $temp[2] - $temp[0];

				$fontwidth = $temp / strlen($this->wm_text);
			}
			else
			{
				$fontwidth = $this->wm_font_size - ($this->wm_font_size / 4);
			}

			$fontheight = $this->wm_font_size;
			$this->wm_vrt_offset += $this->wm_font_size;
		}
		else
		{
			$fontwidth  = imagefontwidth($this->wm_font_size);
			$fontheight = imagefontheight($this->wm_font_size);
		}

		// Set base X and Y axis values
		$x_axis = $this->wm_hor_offset + $this->wm_padding;
		$y_axis = $this->wm_vrt_offset + $this->wm_padding;

		if ($this->wm_use_drop_shadow === FALSE)
		{
			$this->wm_shadow_distance = 0;
		}

		$this->wm_vrt_alignment = strtoupper($this->wm_vrt_alignment[0]);
		$this->wm_hor_alignment = strtoupper($this->wm_hor_alignment[0]);

		// Set vertical alignment
		if ($this->wm_vrt_alignment === 'M')
		{
			$y_axis += ($this->orig_height / 2) + ($fontheight / 2);
		}
		elseif ($this->wm_vrt_alignment === 'B')
		{
			$y_axis += $this->orig_height - $fontheight - $this->wm_shadow_distance - ($fontheight / 2);
		}

		// Set horizontal alignment
		if ($this->wm_hor_alignment === 'R')
		{
			$x_axis += $this->orig_width - ($fontwidth * strlen($this->wm_text)) - $this->wm_shadow_distance;
		}
		elseif ($this->wm_hor_alignment === 'C')
		{
			$x_axis += floor(($this->orig_width - ($fontwidth * strlen($this->wm_text))) / 2);
		}

		if ($this->wm_use_drop_shadow)
		{
			// Offset from text
			$x_shad = $x_axis + $this->wm_shadow_distance;
			$y_shad = $y_axis + $this->wm_shadow_distance;

			/* Set RGB values for shadow
			 *
			 * First character is #, so we don't really need it.
			 * Get the rest of the string and split it into 2-length
			 * hex values:
			 */
			$drp_color = str_split(substr($this->wm_shadow_color, 1, 6), 2);
			$drp_color = imagecolorclosest($src_img, hexdec($drp_color[0]), hexdec($drp_color[1]), hexdec($drp_color[2]));

			// Add the shadow to the source image
			if ($this->wm_use_truetype)
			{
				imagettftext($src_img, $this->wm_font_size, 0, $x_shad, $y_shad, $drp_color, $this->wm_font_path, $this->wm_text);
			}
			else
			{
				imagestring($src_img, $this->wm_font_size, $x_shad, $y_shad, $this->wm_text, $drp_color);
			}
		}

		/* Set RGB values for text
		 *
		 * First character is #, so we don't really need it.
		 * Get the rest of the string and split it into 2-length
		 * hex values:
		 */
		$txt_color = str_split(substr($this->wm_font_color, 1, 6), 2);
		$txt_color = imagecolorclosest($src_img, hexdec($txt_color[0]), hexdec($txt_color[1]), hexdec($txt_color[2]));

		// Add the text to the source image
		if ($this->wm_use_truetype)
		{
			imagettftext($src_img, $this->wm_font_size, 0, $x_axis, $y_axis, $txt_color, $this->wm_font_path, $this->wm_text);
		}
		else
		{
			imagestring($src_img, $this->wm_font_size, $x_axis, $y_axis, $this->wm_text, $txt_color);
		}

		// We can preserve transparency for PNG images
		if ($this->image_type === 3)

The strict comparison === seems to always evaluate to false as the types of $this->image_type (string) and 3 (integer) can never be identical. Maybe you want to use a loose comparison == instead?

		{
			imagealphablending($src_img, FALSE);
			imagesavealpha($src_img, TRUE);
		}

		// Output the final image
		if ($this->dynamic_output === TRUE)
		{
			$this->image_display_gd($src_img);
		}
		else
		{
			$this->image_save_gd($src_img);
		}

		imagedestroy($src_img);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Image - GD
	 *
	 * This simply creates an image resource handle
	 * based on the type of image being processed
	 *
	 * @param	string
	 * @param	string
	 * @return	resource
	 */
	public function image_create_gd($path = '', $image_type = '')
	{
		if ($path === '')
		{
			$path = $this->full_src_path;
		}

		if ($image_type === '')
		{
			$image_type = $this->image_type;
		}

		switch ($image_type)
		{
			case 1:
				if ( ! function_exists('imagecreatefromgif'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_gif_not_supported'));
					return FALSE;
				}

				return imagecreatefromgif($path);
			case 2:
				if ( ! function_exists('imagecreatefromjpeg'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_jpg_not_supported'));
					return FALSE;
				}

				return imagecreatefromjpeg($path);
			case 3:
				if ( ! function_exists('imagecreatefrompng'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_png_not_supported'));
					return FALSE;
				}

				return imagecreatefrompng($path);
			default:
				$this->set_error(array('imglib_unsupported_imagecreate'));
				return FALSE;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Write image file to disk - GD
	 *
	 * Takes an image resource as input and writes the file
	 * to the specified destination
	 *
	 * @param	resource
	 * @return	bool
	 */
	public function image_save_gd($resource)
	{
		switch ($this->image_type)
		{
			case 1:
				if ( ! function_exists('imagegif'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_gif_not_supported'));
					return FALSE;
				}

				if ( ! @imagegif($resource, $this->full_dst_path))
				{
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
			break;
			case 2:
				if ( ! function_exists('imagejpeg'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_jpg_not_supported'));
					return FALSE;
				}

				if ( ! @imagejpeg($resource, $this->full_dst_path, $this->quality))
				{
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
			break;
			case 3:
				if ( ! function_exists('imagepng'))
				{
					$this->set_error(array('imglib_unsupported_imagecreate', 'imglib_png_not_supported'));
					return FALSE;
				}

				if ( ! @imagepng($resource, $this->full_dst_path))
				{
					$this->set_error('imglib_save_failed');
					return FALSE;
				}
			break;
			default:
				$this->set_error(array('imglib_unsupported_imagecreate'));
				return FALSE;
			break;
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Dynamically outputs an image
	 *
	 * @param	resource
	 * @return	void
	 */
	public function image_display_gd($resource)
	{
		header('Content-Disposition: filename='.$this->source_image.';');
		header('Content-Type: '.$this->mime_type);
		header('Content-Transfer-Encoding: binary');
		header('Last-Modified: '.gmdate('D, d M Y H:i:s', time()).' GMT');

		switch ($this->image_type)
		{
			case 1	:	imagegif($resource);

The case body in a switch statement must start on the line following the statement.

				break;
			case 2	:	imagejpeg($resource, NULL, $this->quality);

The case body in a switch statement must start on the line following the statement.

				break;
			case 3	:	imagepng($resource);

The case body in a switch statement must start on the line following the statement.

				break;
			default:	echo 'Unable to display the image';

The default body in a switch statement must start on the line following the statement.

				break;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Re-proportion Image Width/Height
	 *
	 * When creating thumbs, the desired width/height
	 * can end up warping the image due to an incorrect
	 * ratio between the full-sized image and the thumb.
	 *
	 * This function lets us re-proportion the width/height
	 * if users choose to maintain the aspect ratio when resizing.
	 *
	 * @return	void
	 */
	public function image_reproportion()
	{
		if (($this->width === 0 && $this->height === 0) OR $this->orig_width === 0 OR $this->orig_height === 0
			OR ( ! ctype_digit((string) $this->width) && ! ctype_digit((string) $this->height))
			OR ! ctype_digit((string) $this->orig_width) OR ! ctype_digit((string) $this->orig_height))
		{
			return;
		}

		// Sanitize
		$this->width = (int) $this->width;
		$this->height = (int) $this->height;

		if ($this->master_dim !== 'width' && $this->master_dim !== 'height')
		{
			if ($this->width > 0 && $this->height > 0)
			{
				$this->master_dim = ((($this->orig_height/$this->orig_width) - ($this->height/$this->width)) < 0)
							? 'width' : 'height';
			}
			else
			{
				$this->master_dim = ($this->height === 0) ? 'width' : 'height';
			}
		}
		elseif (($this->master_dim === 'width' && $this->width === 0)
			OR ($this->master_dim === 'height' && $this->height === 0))
		{
			return;
		}

		if ($this->master_dim === 'width')
		{
			$this->height = (int) ceil($this->width*$this->orig_height/$this->orig_width);
		}
		else
		{
			$this->width = (int) ceil($this->orig_width*$this->height/$this->orig_height);
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Get image properties
	 *
	 * A helper function that gets info about the file
	 *
	 * @param	string
	 * @param	bool
	 * @return	mixed
	 */
	public function get_image_properties($path = '', $return = FALSE)
	{
		// For now we require GD but we should
		// find a way to determine this using IM or NetPBM

		if ($path === '')
		{
			$path = $this->full_src_path;
		}

		if ( ! file_exists($path))
		{
			$this->set_error('imglib_invalid_path');
			return FALSE;
		}

		$vals = getimagesize($path);
		$types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');
		$mime = (isset($types[$vals[2]])) ? 'image/'.$types[$vals[2]] : 'image/jpg';

		if ($return === TRUE)
		{
			return array(
					'width' =>	$vals[0],
					'height' =>	$vals[1],
					'image_type' =>	$vals[2],
					'size_str' =>	$vals[3],
					'mime_type' =>	$mime
				);
		}

		$this->orig_width	= $vals[0];
		$this->orig_height	= $vals[1];
		$this->image_type	= $vals[2];
		$this->size_str		= $vals[3];
		$this->mime_type	= $mime;

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Size calculator
	 *
	 * This function takes a known width x height and
	 * recalculates it to a new size. Only one
	 * new variable needs to be known
	 *
	 *	$props = array(
	 *			'width'		=> $width,
	 *			'height'	=> $height,
	 *			'new_width'	=> 40,
	 *			'new_height'	=> ''
	 *		);
	 *
	 * @param	array
	 * @return	array
	 */
	public function size_calculator($vals)
	{
		if ( ! is_array($vals))
		{
			return;
		}

		$allowed = array('new_width', 'new_height', 'width', 'height');

		foreach ($allowed as $item)
		{
			if (empty($vals[$item]))
			{
				$vals[$item] = 0;
			}
		}

		if ($vals['width'] === 0 OR $vals['height'] === 0)
		{
			return $vals;
		}

		if ($vals['new_width'] === 0)
		{
			$vals['new_width'] = ceil($vals['width']*$vals['new_height']/$vals['height']);
		}
		elseif ($vals['new_height'] === 0)
		{
			$vals['new_height'] = ceil($vals['new_width']*$vals['height']/$vals['width']);
		}

		return $vals;
	}

	// --------------------------------------------------------------------

	/**
	 * Explode source_image
	 *
	 * This is a helper function that extracts the extension
	 * from the source_image.  This function lets us deal with
	 * source_images with multiple periods, like: my.cool.jpg
	 * It returns an associative array with two elements:
	 * $array['ext']  = '.jpg';
	 * $array['name'] = 'my.cool';
	 *
	 * @param	array
	 * @return	array
	 */
	public function explode_name($source_image)
	{
		$ext = strrchr($source_image, '.');
		$name = ($ext === FALSE) ? $source_image : substr($source_image, 0, -strlen($ext));

		return array('ext' => $ext, 'name' => $name);
	}

	// --------------------------------------------------------------------

	/**
	 * Is GD Installed?
	 *
	 * @return	bool
	 */
	public function gd_loaded()
	{
		if ( ! extension_loaded('gd'))
		{
			/* As it is stated in the PHP manual, dl() is not always available
			 * and even if so - it could generate an E_WARNING message on failure
			 */
			return (function_exists('dl') && @dl('gd.so'));
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Get GD version
	 *
	 * @return	mixed
	 */
	public function gd_version()
	{
		if (function_exists('gd_info'))
		{
			$gd_version = @gd_info();
			return preg_replace('/\D/', '', $gd_version['GD Version']);
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Set error message
	 *
	 * @param	string
	 * @return	void
	 */
	public function set_error($msg)
	{
		$CI =& get_instance();
		$CI->lang->load('imglib');

		if (is_array($msg))
		{
			foreach ($msg as $val)
			{
				$msg = ($CI->lang->line($val) === FALSE) ? $val : $CI->lang->line($val);
				$this->error_msg[] = $msg;
				log_message('error', $msg);
			}
		}
		else
		{
			$msg = ($CI->lang->line($msg) === FALSE) ? $msg : $CI->lang->line($msg);
			$this->error_msg[] = $msg;
			log_message('error', $msg);
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Show error messages
	 *
	 * @param	string
	 * @param	string
	 * @return	string
	 */
	public function display_errors($open = '<p>', $close = '</p>')
	{
		return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : '';
	}

}