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Edit File: Image_lib.php
<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2019 - 2022, CodeIgniter Foundation * * 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/) * @copyright Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/) * @license https://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/userguide3/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 : ''; } }
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