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Image_lib.php
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Image_lib.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, 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 $wm_use_truetype = FALSE;
/**
* Constructor
*
* @param string
* @return void
*/
public function __construct($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()
{
$props = array('source_folder', 'dest_folder', 'source_image', 'full_src_path', 'full_dst_path', 'new_image', 'image_type', 'size_str', 'quality', 'orig_width', 'orig_height', 'width', 'height', 'rotation_angle', 'x_axis', 'y_axis', 'create_fnc', 'copy_fnc', 'wm_overlay_path', 'wm_use_truetype', 'dynamic_output', 'wm_font_size', 'wm_text', 'wm_vrt_alignment', 'wm_hor_alignment', 'wm_padding', 'wm_hor_offset', 'wm_vrt_offset', 'wm_font_color', 'wm_use_drop_shadow', 'wm_shadow_color', 'wm_shadow_distance', 'wm_opacity');
foreach ($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 AND 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 (preg_match('/gd2$/i', $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 (preg_match('/gd2$/i', $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, FILE_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, $this->height);
if ($this->image_type == 3) // png we can actually preserve transparency
{
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);
}
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($this->full_dst_path, FILE_WRITE_MODE);
return TRUE;
}
// --------------------------------------------------------------------
/**
* Image Process Using ImageMagick
*
* This function will resize, crop or rotate
*
* @access public
* @param string
* @return bool
*/
function image_process_imagemagick($action = 'resize')
{
// Do we have a vaild library path?
if ($this->library_path == '')
{
$this->set_error('imglib_libpath_invalid');
return FALSE;
}
if ( ! preg_match("/convert$/i", $this->library_path))
{
$this->library_path = rtrim($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, FILE_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($this->full_dst_path, FILE_WRITE_MODE);
return TRUE;
}
// --------------------------------------------------------------------
/**
* Image Rotate Using GD
*
* @access public
* @return bool
*/
function image_rotate_gd()
{
// Create the image handle
if ( ! ($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, $white);
// Save the Image
if ($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, FILE_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, FILE_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