Your IP : 216.73.216.171
<?php
/*
Utility functions for manipulating images
Written by Chris Jean for iThemes.com
Version 1.0.5
Version History
1.0.0 - 2011-10-05 - Chris Jean
Built from it-file-utility.php version 2.1.0
1.0.1 - 2012-09-24 - Chris Jean
create_favicon now forces the permissions to 644.
1.0.2 - 2012-12-03 - Chris Jean
Added compatibility fix for WordPress 3.5 to the resize_image function as the wp_load_image function is now
deprecated.
1.0.3 - 2013-01-09 - Chris Jean
Removed unnecessary argument to the save_ico function call.
1.0.4 - 2013-06-25 - Chris Jean
Changed function declarations to "public static".
1.0.5 - 2015-06-26 - Chris Jean
Security Fix: Forced width and height arguments to integers and sanitized command line arguments prior to
passing them to system().
*/
if ( !class_exists( 'ITImageUtility' ) ) {
class ITImageUtility {
public static function get_image_dimensions( $file ) {
it_classes_load( 'it-file-utility.php' );
if ( is_numeric( $file ) ) {
$file_info = ITFileUtility::get_file_attachment( $file );
if ( false === $file_info )
return new WP_Error( 'error_loading_image_attachment', "Could not find requested file attachment ($file)" );
$file = $file_info['file'];
}
list ( $width, $height, $type ) = getimagesize( $file );
return array( $width, $height );
}
public static function resize_image( $file, $max_w = 0, $max_h = 0, $crop = true, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
it_classes_load( 'it-file-utility.php' );
if ( is_numeric( $file ) ) {
$file_info = ITFileUtility::get_file_attachment( $file );
if ( false === $file_info )
return new WP_Error( 'error_loading_image_attachment', "Could not find requested file attachment ($file)" );
$file = $file_info['file'];
}
else
$file_attachment_id = '';
if ( preg_match( '/\.ico$/', $file ) )
return array( 'file' => $file, 'url' => ITFileUtility::get_url_from_file( $file ), 'name' => basename( $file ) );
if ( version_compare( $GLOBALS['wp_version'], '3.4.9', '>' ) ) {
// Compat code taken from pre-release 3.5.0 code.
if ( ! file_exists( $file ) )
return new WP_Error( 'error_loading_image', sprintf( __( 'File “%s” doesn’t exist?' ), $file ) );
if ( ! function_exists('imagecreatefromstring') )
return new WP_Error( 'error_loading_image', __( 'The GD image library is not installed.' ) );
// Set artificially high because GD uses uncompressed images in memory
@ini_set( 'memory_limit', apply_filters( 'image_memory_limit', WP_MAX_MEMORY_LIMIT ) );
$image = imagecreatefromstring( file_get_contents( $file ) );
if ( ! is_resource( $image ) )
return new WP_Error( 'error_loading_image', sprintf( __( 'File “%s” is not an image.' ), $file ) );
}
else {
require_once( ABSPATH . 'wp-admin/includes/image.php' );
$image = wp_load_image( $file );
if ( ! is_resource( $image ) )
return new WP_Error( 'error_loading_image', $image );
}
list( $orig_w, $orig_h, $orig_type ) = getimagesize( $file );
$dims = ITImageUtility::_image_resize_dimensions( $orig_w, $orig_h, $max_w, $max_h, $crop );
if ( is_wp_error( $dims ) ) {
return $dims;
} else if ( ! $dims ) {
return new WP_Error( 'error_resizing_image', "Could not resize image" );
}
list( $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h ) = $dims;
if ( ( $orig_w == $dst_w ) && ( $orig_h == $dst_h ) )
return array( 'file' => $file, 'url' => ITFileUtility::get_url_from_file( $file ), 'name' => basename( $file ) );
if ( ! $suffix )
$suffix = "resized-image-${dst_w}x${dst_h}";
$info = pathinfo( $file );
$dir = $info['dirname'];
$ext = $info['extension'];
$name = basename( $file, ".${ext}" );
if ( ! is_null( $dest_path ) && $_dest_path = realpath( $dest_path ) )
$dir = $_dest_path;
$destfilename = "${dir}/${name}-${suffix}.${ext}";
if ( file_exists( $destfilename ) ) {
if ( filemtime( $file ) > filemtime( $destfilename ) )
unlink( $destfilename );
else
return array( 'file' => $destfilename, 'url' => ITFileUtility::get_url_from_file( $destfilename ), 'name' => basename( $destfilename ) );
}
// ImageMagick cannot resize animated PNG files yet, so this only works for
// animated GIF files.
$animated = false;
if ( ITImageUtility::is_animated_gif( $file ) ) {
$coalescefilename = "${dir}/${name}-coalesced-file.${ext}";
$safe_file_name = escapeshellarg( $file );
$safe_coalescefilename = escapeshellarg( $coalescefilename );
if ( ! file_exists( $coalescefilename ) ) {
system( "convert $safe_file_name -coalesce $safe_coalescefilename" );
}
if ( file_exists( $coalescefilename ) ) {
$safe_crop_argument = escapeshellarg( "{$src_w}x{$src_h}+{$src_x}+{$src_y}!" );
$safe_destfilename = escapeshellarg( $destfilename );
system( "convert -crop $safe_crop_argument $safe_coalescefilename $safe_destfilename" );
if ( file_exists( $destfilename ) ) {
$safe_resize_argument = escapeshellarg( "${dst_w}x${dst_h}" );
system( "mogrify -resize $safe_resize_argument $safe_destfilename" );
system( "convert -layers optimize $safe_destfilename" );
$animated = true;
}
}
}
if ( ! $animated ) {
$newimage = imagecreatetruecolor( $dst_w, $dst_h );
// preserve PNG transparency
if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
imagealphablending( $newimage, false );
imagesavealpha( $newimage, true );
}
imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
// we don't need the original in memory anymore
if ( $orig_type == IMAGETYPE_GIF ) {
if ( ! imagegif( $newimage, $destfilename ) )
return new WP_Error( 'resize_path_invalid', __( 'Resize path invalid' ) );
}
elseif ( $orig_type == IMAGETYPE_PNG ) {
if ( ! imagepng( $newimage, $destfilename ) )
return new WP_Error( 'resize_path_invalid', __( 'Resize path invalid' ) );
}
else {
// all other formats are converted to jpg
$destfilename = "{$dir}/{$name}-{$suffix}.jpg";
if ( ! imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality ) ) )
return new WP_Error( 'resize_path_invalid', __( 'Resize path invalid' ) );
}
imagedestroy( $newimage );
}
imagedestroy( $image );
// Set correct file permissions
$stat = stat( dirname( $destfilename ) );
$perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
@ chmod( $destfilename, $perms );
return array( 'file' => $destfilename, 'url' => ITFileUtility::get_url_from_file( $destfilename ), 'name' => basename( $destfilename ) );
}
// Customized image_resize_dimensions() from 2.6.3 wp-admin/includes/media.php (cheanged to resize to fill on crop)
public static function _image_resize_dimensions( $orig_w, $orig_h, $dest_w = 0, $dest_h = 0, $crop = false ) {
if ( ( $orig_w <= 0 ) || ( $orig_h <= 0 ) )
return new WP_Error ( 'error_resizing_image', "Supplied invalid original dimensions ($orig_w, $orig_h)" );
if ( ( $dest_w < 0 ) || ( $dest_h < 0 ) )
return new WP_Error ( 'error_resizing_image', "Supplied invalid destination dimentions ($dest_w, $dest_h)" );
if ( ( $dest_w == 0 ) || ( $dest_h == 0 ) )
$crop = false;
$new_w = $dest_w;
$new_h = $dest_h;
$s_x = 0;
$s_y = 0;
$crop_w = $orig_w;
$crop_h = $orig_h;
if ( $crop ) {
$cur_ratio = $orig_w / $orig_h;
$new_ratio = $dest_w / $dest_h;
if ( $cur_ratio > $new_ratio ) {
$crop_w = floor( $orig_w / ( ( $dest_h / $orig_h ) / ( $dest_w / $orig_w ) ) );
$s_x = floor( ( $orig_w - $crop_w ) / 2 );
}
elseif ( $new_ratio > $cur_ratio ) {
$crop_h = floor( $orig_h / ( ( $dest_w / $orig_w ) / ( $dest_h / $orig_h ) ) );
$s_y = floor( ( $orig_h - $crop_h ) / 2 );
}
}
else
list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
$s_x = intval( $s_x );
$s_y = intval( $s_y );
$new_w = intval( $new_w );
$new_h = intval( $new_h );
$crop_w = intval( $crop_w );
$crop_h = intval( $crop_h );
return array( 0, 0, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_h );
}
// Can only detect animated GIF files, which is fine because ImageMagick doesn't seem
// to be able to resize animated PNG (MNG) files yet.
public static function is_animated_gif( $file ) {
$filecontents=file_get_contents($file);
$str_loc=0;
$count=0;
while ($count < 2) # There is no point in continuing after we find a 2nd frame
{
$where1=strpos($filecontents,"\x00\x21\xF9\x04",$str_loc);
if ($where1 === FALSE)
{
break;
}
else
{
$str_loc=$where1+1;
$where2=strpos($filecontents,"\x00\x2C",$str_loc);
if ($where2 === FALSE)
{
break;
}
else
{
if ($where1+8 == $where2)
{
$count++;
}
$str_loc=$where2+1;
}
}
}
if ($count > 1)
return(true);
return(false);
}
public static function create_favicon( $dir_name, $image, $sizes = false ) {
it_classes_load( 'it-file-utility.php' );
require_once( dirname( __FILE__ ) . '/classes/class-php-ico.php' );
if ( ! is_array( $sizes ) || ( false === $sizes ) ) {
$sizes = array(
array( 16, 16 ),
array( 24, 24 ),
array( 32, 32 ),
array( 48, 48 ),
);
}
$ico = new PHP_ICO( $image, $sizes );
$path = ITFileUtility::get_writable_directory( $dir_name );
while ( empty( $name ) || file_exists( "$path/$name" ) )
$name = ITUtility::get_random_string( array( 6, 10 ) ) . '.ico';
$result = $ico->save_ico( "$path/$name" );
if ( true != $result )
return false;
@chmod( "$path/$name", 0644 );
return "$path/$name";
}
}
}