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ImgURL是一个简单、纯粹的图床程序，让个人图床多一个选择。
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imgurl/system/libraries/Image_lib.php

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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2018, 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. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link https://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 https://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);
}
/**
* A work-around for some improperly formatted, but
* usable JPEGs; known to be produced by Samsung
* smartphones' front-facing cameras.
*
* @see https://github.com/bcit-ci/CodeIgniter/issues/4967
* @see https://bugs.php.net/bug.php?id=72404
*/
ini_set('gd.jpeg_ignore_warning', 1);
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'), TRUE))
{
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].$matches[1][2];
}
else
{
continue;
}
}
elseif (in_array($key, array('width', 'height'), TRUE) && ! ctype_digit((string) $val))
{
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 && strpos($this->new_image, '\\') === FALSE)
{
$this->dest_image = $this->new_image;
$this->dest_folder = $this->source_folder;
}
else
{
// Is there a file name?
if ( ! preg_match('#\.(jpg|jpeg|gif|png)$#i', $this->new_image))
{
$this->dest_image = $this->source_image;
$this->dest_folder = $this->new_image;
}
else
{
$x = explode('/', str_replace('\\', '/', $this->new_image));
$this->dest_image = end($x);
$this->dest_folder = str_replace($this->dest_image, '', $this->new_image);
}
$this->dest_folder = realpath($this->dest_folder).'/';
}
/* 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))
{
$this->quality = 90;
}
// Set the x/y coordinates
is_numeric($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)
{
$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
{
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);
if ($this->dynamic_output !== TRUE)
{
chmod($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.'+'.$this->y_axis;
}
elseif ($action === 'rotate')
{
$cmd .= ($this->rotation_angle === 'hor' OR $this->rotation_angle === 'vrt')
? ' -flop'
: ' -rotate '.$this->rotation_angle;
}
else // Resize
{
if($this->maintain_ratio === TRUE)
{
$cmd .= ' -resize '.$this->width.'x'.$this->height;
}
else
{
$cmd .= ' -resize '.$this->width.'x'.$this->height.'\!';
}
}
$cmd .= ' '.escapeshellarg($this->full_src_path).' '.escapeshellarg($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';
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.' '.escapeshellarg($this->full_src_path).' | '.$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)
{
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)
{
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);
break;
case 2 : imagejpeg($resource, NULL, $this->quality);
break;
case 3 : imagepng($resource);
break;
default: echo 'Unable to display the image';
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);
if ($vals === FALSE)
{
$this->set_error('imglib_invalid_image');
return FALSE;
}
$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 : '';
}
}