Subversion-Projekte lars-tiefland.codeigniter

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */

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

/**

 * Image Manipulation class

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Image_lib

 * @author		ExpressionEngine Dev Team

 * @link		http://codeigniter.com/user_guide/libraries/image_lib.html

 */

class CI_Image_lib {

	var $image_library		= 'gd2';  	// Can be:  imagemagick, netpbm, gd, gd2

	var $library_path		= '';

	var $dynamic_output		= FALSE;	// Whether to send to browser or write to disk

	var $source_image		= '';

	var $new_image			= '';

	var $width				= '';

	var $height				= '';

	var $quality			= '90';

	var $create_thumb		= FALSE;

	var $thumb_marker		= '_thumb';

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

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

	var $rotation_angle		= '';

	var $x_axis				= '';

	var	$y_axis				= '';

	// Watermark Vars

	var $wm_text			= '';			// Watermark text if graphic is not used

	var $wm_type			= 'text';		// Type of watermarking.  Options:  text/overlay

	var $wm_x_transp		= 4;

	var $wm_y_transp		= 4;

	var $wm_overlay_path	= '';			// Watermark image path

	var $wm_font_path		= '';			// TT font

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

	var $wm_vrt_alignment	= 'B';			// Vertical alignment:   T M B

	var $wm_hor_alignment	= 'C';			// Horizontal alignment: L R C

	var $wm_padding			= 0;			// Padding around text

	var $wm_hor_offset		= 0;			// Lets you push text to the right

	var $wm_vrt_offset		= 0;			 // Lets you push  text down

	var $wm_font_color		= '#ffffff';	// Text color

	var $wm_shadow_color	= '';			// Dropshadow color

	var $wm_shadow_distance	= 2;			// Dropshadow distance

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

	// Private Vars

	var $source_folder		= '';

	var $dest_folder		= '';

	var $mime_type			= '';

	var $orig_width			= '';

	var $orig_height		= '';

	var $image_type			= '';

	var $size_str			= '';

	var $full_src_path		= '';

	var $full_dst_path		= '';

	var $create_fnc			= 'imagecreatetruecolor';

	var $copy_fnc			= 'imagecopyresampled';

	var $error_msg			= array();

	var $wm_use_drop_shadow	= FALSE;

	var $wm_use_truetype	= FALSE;

	/**

	 * Constructor

	 *

	 * @access	public

	 * @param	string

	 * @return	void

	 */

	function CI_Image_lib($props = array())

	{

		if (count($props) > 0)

		{

			$this->initialize($props);

		}

		log_message('debug', "Image Lib Class Initialized");

	}

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

	/**

	 * Initialize image properties

	 *

	 * Resets values in case this class is used in a loop

	 *

	 * @access	public

	 * @return	void

	 */

	function clear()

	{

		$props = array('source_folder', 'dest_folder', 'source_image', 'full_src_path', 'full_dst_path', 'new_image', 'image_type', 'size_str', 'quality', 'orig_width', 'orig_height', 'rotation_angle', 'x_axis', 'y_axis', 'create_fnc', 'copy_fnc', 'wm_overlay_path', 'wm_use_truetype', 'dynamic_output', 'wm_font_size', 'wm_text', 'wm_vrt_alignment', 'wm_hor_alignment', 'wm_padding', 'wm_hor_offset', 'wm_vrt_offset', 'wm_font_color', 'wm_use_drop_shadow', 'wm_shadow_color', 'wm_shadow_distance', 'wm_opacity');

		foreach ($props as $val)

		{

			$this->$val = '';

		}

		// special consideration for master_dim

		$this->master_dim = 'auto';

	}

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

	/**

	 * initialize image preferences

	 *

	 * @access	public

	 * @param	array

	 * @return	bool

	 */

	function initialize($props = array())

	{

		/*

		 * Convert array elements into class variables

		 */

		if (count($props) > 0)

		{

			foreach ($props as $key => $val)

			{

				$this->$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 (function_exists('realpath') AND @realpath($this->source_image) !== FALSE)

		{

			$full_source_path = str_replace("\\", "/", realpath($this->source_image));

		}

		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;

		}

		else

		{

			if (strpos($this->new_image, '/') === FALSE)

			{

				$this->dest_folder = $this->source_folder;

				$this->dest_image = $this->new_image;

			}

			else

			{

				if (function_exists('realpath') AND @realpath($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 != '' AND $this->height != ''))

		{

			$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 $this->quality == 0 OR ! is_numeric($this->quality))

			$this->quality = 90;

		// Set the x/y coordinates

		$this->x_axis = ($this->x_axis == '' OR ! is_numeric($this->x_axis)) ? 0 : $this->x_axis;

		$this->y_axis = ($this->y_axis == '' OR ! is_numeric($this->y_axis)) ? 0 : $this->y_axis;

		// Watermark-related Stuff...

		if ($this->wm_font_color != '')

		{

			if (strlen($this->wm_font_color) == 6)

			{

				$this->wm_font_color = '#'.$this->wm_font_color;

			}

		}

		if ($this->wm_shadow_color != '')

		{

			if (strlen($this->wm_shadow_color) == 6)

			{

				$this->wm_shadow_color = '#'.$this->wm_shadow_color;

			}

		}

		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;

		}

		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

	 *

	 * @access	public

	 * @return	bool

	 */

	function resize()

	{

		$protocol = 'image_process_'.$this->image_library;

		if (eregi("gd2$", $protocol))

		{

			$protocol = 'image_process_gd';

		}

		return $this->$protocol('resize');

	}

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

	/**

	 * Image Crop

	 *

	 * This is a wrapper function that chooses the proper

	 * cropping function based on the protocol specified

	 *

	 * @access	public

	 * @return	bool

	 */

	function crop()

	{

		$protocol = 'image_process_'.$this->image_library;

		if (eregi("gd2$", $protocol))

		{

			$protocol = 'image_process_gd';

		}

		return $this->$protocol('crop');

	}

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

	/**

	 * Image Rotate

	 *

	 * This is a wrapper function that chooses the proper

	 * rotation function based on the protocol specified

	 *

	 * @access	public

	 * @return	bool

	 */

	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)

		{

			$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');

		}

		if ($this->rotation_angle == 'hor' OR $this->rotation_angle == 'vrt')

		{

			return $this->image_mirror_gd();

		}

		else

		{

			return $this->image_rotate_gd();

		}

	}

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

	/**

	 * Image Process Using GD/GD2

	 *

	 * This function will resize or crop

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	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)

		{

			if ($this->orig_width == $this->width AND $this->orig_height == $this->height)

			{

 				if ($this->source_image != $this->new_image)

 				{

					if (@copy($this->full_src_path, $this->full_dst_path))

					{

						@chmod($this->full_dst_path, DIR_WRITE_MODE);

					}

				}

				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) ? TRUE : FALSE;

			}

		}

		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' AND function_exists('imagecreatetruecolor') AND $v2_override == FALSE)

 		if ($this->image_library == 'gd2' AND function_exists('imagecreatetruecolor'))

		{

			$create	= 'imagecreatetruecolor';

			$copy	= 'imagecopyresampled';

		}

		else

		{

			$create	= 'imagecreate';

			$copy	= 'imagecopyresized';

		}

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

		$copy($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);

		}

		else

		{

			// Or save it

			if ( ! $this->image_save_gd($dst_img))

			{

				return FALSE;

			}

		}

		//  Kill the file handles

		imagedestroy($dst_img);

		imagedestroy($src_img);

		// Set the file to 777

		@chmod($this->full_dst_path, DIR_WRITE_MODE);

		return TRUE;

	}

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

	/**

	 * Image Process Using ImageMagick

	 *

	 * This function will resize, crop or rotate

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	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 ( ! eregi("convert$", $this->library_path))

		{

			if ( ! eregi("/$", $this->library_path)) $this->library_path .= "/";

			$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')

		{

			switch ($this->rotation_angle)

			{

				case 'hor' 	: $angle = '-flop';

					break;

				case 'vrt' 	: $angle = '-flip';

					break;

				default		: $angle = '-rotate '.$this->rotation_angle;

					break;

			}

			$cmd .= " ".$angle." \"$this->full_src_path\" \"$this->full_dst_path\" 2>&1";

		}

		else  // Resize

		{

			$cmd .= " -resize ".$this->width."x".$this->height." \"$this->full_src_path\" \"$this->full_dst_path\" 2>&1";

		}

		$retval = 1;

		@exec($cmd, $output, $retval);

		//	Did it work?

		if ($retval > 0)

		{

			$this->set_error('imglib_image_process_failed');

			return FALSE;

		}

		// Set the file to 777

		@chmod($this->full_dst_path, DIR_WRITE_MODE);

		return TRUE;

	}

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

	/**

	 * Image Process Using NetPBM

	 *

	 * This function will resize, crop or rotate

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	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';

					break;

				case 180	:	$angle = 'r180';

					break;

				case 270 	:	$angle = 'r90';

					break;

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

					break;

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

					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($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, DIR_WRITE_MODE);

		return TRUE;

	}

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

	/**

	 * Image Rotate Using GD

	 *

	 * @access	public

	 * @return	bool

	 */

	function image_rotate_gd()

	{

		// Is Image Rotation Supported?

		// this function is only supported as of PHP 4.3

		if ( ! function_exists('imagerotate'))

		{

			$this->set_error('imglib_rotate_unsupported');

			return FALSE;

		}

		//  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);

		//  Save the Image

		if ($this->dynamic_output == TRUE)

		{

			$this->image_display_gd($dst_img);

		}

		else

		{

			// Or save it

			if ( ! $this->image_save_gd($dst_img))

			{

				return FALSE;

			}

		}

		//  Kill the file handles

		imagedestroy($dst_img);

		imagedestroy($src_img);

		// Set the file to 777

		@chmod($this->full_dst_path, DIR_WRITE_MODE);

		return true;

	}

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

	/**

	 * Create Mirror Image using GD

	 *

	 * This function will flip horizontal or vertical

	 *

	 * @access	public

	 * @return	bool

	 */

	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;

				$bot = $height-1;

				while ($top < $bot)

				{

					$ct = imagecolorat($src_img, $i, $top);

					$cb = imagecolorat($src_img, $i, $bot);

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

					imagesetpixel($src_img, $i, $bot, $ct);

					$top++;

					$bot--;

				}

			}

		}

		//  Show the image

		if ($this->dynamic_output == TRUE)

		{

			$this->image_display_gd($src_img);

		}

		else

		{

			// Or save it

			if ( ! $this->image_save_gd($src_img))

			{

				return FALSE;

			}

		}

		//  Kill the file handles

		imagedestroy($src_img);

		// Set the file to 777

		@chmod($this->full_dst_path, DIR_WRITE_MODE);

		return TRUE;

	}

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

	/**

	 * Image Watermark

	 *

	 * This is a wrapper function that chooses the type

	 * of watermarking based on the specified preference.

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	function watermark()

	{

		if ($this->wm_type == 'overlay')

		{

			return $this->overlay_watermark();

		}

		else

		{

			return $this->text_watermark();

		}

	}

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

	/**

	 * Watermark - Graphic Version

	 *

	 * @access	public

	 * @return	bool

	 */

	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

		$this->wm_vrt_alignment = strtoupper(substr($this->wm_vrt_alignment, 0, 1));

		$this->wm_hor_alignment = strtoupper(substr($this->wm_hor_alignment, 0, 1));

		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

		switch ($this->wm_vrt_alignment)

		{

			case 'T':

				break;

			case 'M':	$y_axis += ($this->orig_height / 2) - ($wm_height / 2);

				break;

			case 'B':	$y_axis += $this->orig_height - $wm_height;

				break;

		}

		//  Set the horizontal position

		switch ($this->wm_hor_alignment)

		{

			case 'L':

				break;

			case 'C':	$x_axis += ($this->orig_width / 2) - ($wm_width / 2);

				break;

			case 'R':	$x_axis += $this->orig_width - $wm_width;

				break;

		}

		//  Build the finalized image

		if ($wm_img_type == 3 AND 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);

		}

		//  Output the image

		if ($this->dynamic_output == TRUE)

		{

			$this->image_display_gd($src_img);

		}

		else

		{

			if ( ! $this->image_save_gd($src_img))

			{

				return FALSE;

			}

		}

		imagedestroy($src_img);

		imagedestroy($wm_img);

		return TRUE;

	}

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

	/**

	 * Watermark - Text Version

	 *

	 * @access	public

	 * @return	bool

	 */

	function text_watermark()

	{

		if ( ! ($src_img = $this->image_create_gd()))

		{

			return FALSE;

		}

		if ($this->wm_use_truetype == TRUE AND ! file_exists($this->wm_font_path))

		{

			$this->set_error('imglib_missing_font');

			return FALSE;

		}

		//  Fetch source image properties

		$this->get_image_properties();

		// Set RGB values for text and shadow

		$this->wm_font_color	= str_replace('#', '', $this->wm_font_color);