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<?php
/**
* @package Widgetkit
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
/*
Class: ImageWidgetkitHelper
Image helper class.
*/
class ImageWidgetkitHelper extends WidgetkitHelper {
private $cHeight = '0';
private $cWidth = '0';
private $image_data_base64 = '';
/*
Function: __construct
Class Constructor.
*/
public function __construct($widgetkit) {
parent::__construct($widgetkit);
}
/*
Function: create
Create a image object
Parameters:
$file - Image file path
Returns:
Object
*/
public function create($file) {
return new WidgetkitImage($file);
}
/*
Function: check
Check GD library support
Returns:
Boolean
*/
public function check() {
$gd_functions = array(
'getimagesize',
'imagecreatefromgif',
'imagecreatefromjpeg',
'imagecreatefrompng',
'imagecreatetruecolor',
'imagecopyresized',
'imagecopy',
'imagegif',
'imagejpeg',
'imagepng'
);
foreach ($gd_functions as $name) {
if (!function_exists($name)) return false;
}
return true;
}
/*
Function: prepareLazyload
Prepare Html images for lazy loading
Returns:
String
*/
public function prepareLazyload($content) {
if (stripos($content, '<img') !== false) {
$imgs_regex = '#<img[^>]+>#im';
preg_match_all($imgs_regex, $content, $images);
foreach ($images as $img) {
$img = $img[0];
preg_match('/src=["|\']([^"]*)["|\']/i',$img, $src);
preg_match('/width=["|\']([^"]*)["|\']/i',$img, $width);
preg_match('/height=["|\']([^"]*)["|\']/i',$img, $height);
$img_src = $src[0];
if (!preg_match('/^(https?:)?\//', $src[1])) {
$img_src = 'src="' . JUri::base(true) .'/'. $src[1] .'"';
}
if ($width && $height) {
if ($this->cWidth != $width[1] || $this->cHeight != $height[1]) {
$this->cWidth = $width[1];
$this->cHeight = $height[1];
if ($image = imagecreatetruecolor($this->cWidth, $this->cHeight) ) {
imagesavealpha($image, true);
$transparent = imagecolorallocatealpha($image, 0, 0, 0, 127);
imagefill($image, 0, 0, $transparent);
ob_start ();
imagepng ($image);
$image_data = ob_get_contents ();
ob_end_clean ();
$this->image_data_base64 = base64_encode ($image_data);
};
}
$tmp_image = str_replace($src[0], 'src="data:image/png;base64,'.$this->image_data_base64.'" data-'.$img_src, $img);
$content = str_replace($img, $tmp_image, $content);
}
}
}
return $content;
}
}
/*
Class: WidgetkitImage
Image class for info, resizing.
*/
class WidgetkitImage {
protected $_file;
protected $_resource;
public function __construct($file) {
$this->_file = $file;
}
public function __destruct() {
if (is_resource($this->_resource)) {
imagedestroy($this->_resource);
}
}
/*
Function: options
Retrieve image options
Returns:
Array
*/
public function options() {
$data = @getimagesize($this->_file);
foreach (array(0 => 'width', 1 => 'height', 'bits' => 'bits', 'mime' => 'mime') as $key => $name) {
$options[$name] = $data[$key];
if ($key == 'mime') {
$options['format'] = str_replace('image/', '', $data[$key]);
}
}
return $options;
}
/*
Function: resource
Retrieve image resource
Returns:
Array
*/
public function resource() {
if (empty($this->_resource)) {
extract($this->options());
if ($format == 'jpeg') {
$this->_resource = imagecreatefromjpeg($this->_file);
} else if ($format == 'png') {
$this->_resource = imagecreatefrompng($this->_file);
} else if ($format == 'gif') {
$this->_resource = imagecreatefromgif($this->_file);
}
}
return $this->_resource;
}
/*
Function: output
Get image output
Returns:
Void
*/
public function output($options = array()) {
$options = $this->_options($options);
$image = $this->_image($options);
if ($options['format'] == 'jpeg') {
imagejpeg($image, $options['file'], 90);
} else if ($options['format'] == 'png') {
imagepng($image, $options['file']);
} else if ($options['format'] == 'gif') {
imagegif($image, $options['file']);
}
}
/*
Function: _options
Parse image options using defaults
Returns:
Array
*/
protected function _options($options) {
// get options
$source = $this->options();
$options = array_merge(array('format' => 'auto', 'width' => 'auto', 'height' => 'auto', 'resize' => true, 'file' => null), $options);
// set format
if ($options['format'] == 'auto') {
$options['format'] = $source['format'];
}
// set size
if (($options['width'] == 'auto' || !$options['width']) && ($options['height'] == 'auto' || !$options['height'])) {
$options['width'] = $source['width'];
$options['height'] = $source['height'];
} else if (($options['width'] == 'auto' || !$options['width']) && is_numeric($options['height'])) {
$options['width'] = @($options['height'] / $source['height']) * $source['width'];
} else if (($options['height'] == 'auto' || !$options['height']) && is_numeric($options['width'])) {
$options['height'] = @($options['width'] / $source['width']) * $source['height'];
}
return $options;
}
/*
Function: _image
Create image resource with current options
Returns:
Mixed
*/
protected function _image($options) {
// init vars
$source = $this->options();
$source['image'] = $this->resource();
$source['x'] = 0;
$source['y'] = 0;
// resize image
if ($options['resize']) {
$resized['width'] = @($options['height'] / $source['height']) * $source['width'];
$resized['height'] = @($options['width'] / $source['width']) * $source['height'];
if ($options['width'] <= $resized['width']) {
$width = $resized['width'];
$height = $options['height'];
$source['x'] = intval(($resized['width'] - $options['width']) / 2);
} else {
$width = $options['width'];
$height = $resized['height'];
$source['y'] = intval(($resized['height'] - $options['height']) / 2);
}
$image = imagecreatetruecolor($width, $height);
// save transparent colors
if ($options['format'] == 'png') {
imagecolortransparent($image, imagecolorallocate($image, 0, 0, 0));
imagealphablending($image, false);
imagesavealpha($image, true);
}
// get and reallocate transparency-color for gif
if ($options['format'] == 'gif') {
imagealphablending($image, false);
$transindex = imagecolortransparent($source['image']) <= imagecolorstotal($image) ? imagecolortransparent($source['image']) : imagecolorstotal($image);
if ($transindex >= 0) {
$transcol = imagecolorsforindex($source['image'], $transindex);
$transindex = imagecolorallocatealpha($image, $transcol['red'], $transcol['green'], $transcol['blue'], 127);
imagefill($image, 0, 0, $transindex);
}
}
if (function_exists('imagecopyresampled')) {
@imagecopyresampled($image, $source['image'], 0, 0, 0, 0, $width, $height, $source['width'], $source['height']);
} else {
@imagecopyresized($image, $source['image'], 0, 0, 0, 0, $width, $height, $source['width'], $source['height']);
}
// restore transparency for gif
if ($options['format'] == 'gif') {
if ($transindex >= 0) {
imagecolortransparent($image, $transindex);
for ($y=0; $y < imagesy($image); ++$y) {
for ($x=0; $x < imagesx($image); ++$x) {
if (((imagecolorat($image, $x, $y)>>24) & 0x7F) >= 100) {
imagesetpixel($image, $x, $y, $transindex);
}
}
}
}
}
$source['image'] = $image;
}
// create image
$image = imagecreatetruecolor($options['width'], $options['height']);
// save transparent colors for png
if ($options['format'] == 'png') {
imagecolortransparent($image, imagecolorallocate($source['image'], 0, 0, 0));
imagealphablending($image, false);
imagesavealpha($image, true);
}
// get and reallocate transparency-color for gif
if ($options['format'] == 'gif') {
imagealphablending($image, false);
$transindex = imagecolortransparent($source['image']);
if ($transindex >= 0) {
$transcol = imagecolorsforindex($source['image'], $transindex);
$transindex = imagecolorallocatealpha($image, $transcol['red'], $transcol['green'], $transcol['blue'], 127);
imagefill($image, 0, 0, $transindex);
}
}
@imagecopy($image, $source['image'], 0, 0, $source['x'], $source['y'], $options['width'], $options['height']);
// restore transparency for gif
if ($options['format'] == 'gif') {
if ($transindex >= 0) {
imagecolortransparent($image, $transindex);
for ($y=0; $y < imagesy($image); ++$y) {
for ($x=0; $x < imagesx($image); ++$x) {
if (((imagecolorat($image, $x, $y)>>24) & 0x7F) >= 100) {
imagesetpixel($image, $x, $y, $transindex);
}
}
}
}
}
return $image;
}
}