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<?php
/**
* @author Tassos Marinos <info@tassos.gr>
* @link https://www.tassos.gr
* @copyright Copyright © 2024 Tassos All Rights Reserved
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
*/
// no direct access
defined('_JEXEC') or die;
use Joomla\Filesystem\Folder;
use Joomla\CMS\Uri\Uri;
class NRFrameworkImage {
/**
* @var
*/
private $image;
/**
* @var array
*/
private $variables;
/**
* @param $image
*/
function __construct($image)
{
$this->image = str_replace(Uri::root(true), '', $image);
if (substr($this->image, 0, 1) == "/")
{
$this->image = substr($this->image, 1);
}
// Default values
$this->variables = array (
'height' => '100',
'width' => '100',
'ratio' => '1',
'crop' => true,
'quality' => 100,
'cache' => true,
'filename' => 'img_'
);
}
/**
* @param $width
* @param $height
*/
public function setSize($width, $height) {
$this->variables['width'] = (int) $width;
$this->variables['height'] = (int) $height;
$this->variables['ratio'] = ((int) $width / (int) $height);
}
/**
* @param $crop
*/
public function setCrop($crop) {
$this->variables['crop'] = (bool) $crop;
}
/**
* @param $quality
*/
public function setQuality($quality) {
$this->variables['quality'] = (int) $quality;
}
/**
* @param $cache
*/
public function setCache($cache) {
$this->variables['cache'] = (bool) $cache;
}
/**
* Get some basic information from the source image
* @return array
*/
private function imageInfo() {
$image = getimagesize($this->image);
$info = array();
$info['width'] = $image[0];
$info['height'] = $image[1];
$info['ratio'] = $image[0]/$image[1];
$info['mime'] = $image['mime'];
return $info;
}
/**
* @return resource
* Loads the image
*/
private function openImage() {
switch ($this->imageInfo()['mime']) {
case 'image/jpeg':
$image = imagecreatefromjpeg ($this->image);
break;
case 'image/png':
$image = imagecreatefrompng ($this->image);
imagealphablending( $image, true );
imagesavealpha( $image, true );
break;
case 'image/gif':
$image = imagecreatefromgif ($this->image);
break;
default:
throw new RuntimeException('Unknown file type');
}
return $image;
}
/**
* @param $image
* @return resource
* Does the actual image resize
*/
private function resizeImage($image) {
if (!is_resource($image)) {
throw new RuntimeException('Wrong path or this is not an image');
}
$newImage = imagecreatetruecolor($this->variables['width'], $this->variables['height']);
if (($this->variables['crop'] == true) and ($this->imageInfo()['ratio'] != $this->variables['ratio'])) {
$src_x = $src_y = 0;
$src_w = $this->imageInfo()['width'];
$src_h = $this->imageInfo()['height'];
$cmp_x = $src_w / $this->variables['width'];
$cmp_y = $src_h / $this->variables['height'];
// calculate x or y coordinate and width or height of source
if ($cmp_x > $cmp_y) {
$src_w = round ($src_w / $cmp_x * $cmp_y);
$src_x = round (($src_w - ($src_w / $cmp_x * $cmp_y)) / 2);
} else if ($cmp_y > $cmp_x) {
$src_h = round ($src_h / $cmp_y * $cmp_x);
$src_y = round (($src_h - ($src_h / $cmp_y * $cmp_x)) / 2);
}
imagecopyresampled($newImage,
$image,
0, 0,
$src_x,
$src_y,
$this->variables['width'],
$this->variables['height'],
$src_w,
$src_h);
return $newImage;
}
else {
imagecopyresampled($newImage,
$image,
0, 0, 0, 0,
$this->variables['width'],
$this->variables['height'],
$this->imageInfo()['width'],
$this->imageInfo()['height']);
}
return $newImage;
}
/**
* @return string
* Generate the filename for the image, based on original name, width, height and quality
*/
private function createFilename() {
return $this->variables['filename'].md5($this->image.$this->variables['width'].$this->variables['height'].$this->variables['quality']).'.jpg';
}
/**
* @return bool
* Check if an image exists in the cache
*/
private function checkCache() {
return file_exists(JPATH_SITE.'/cache/images/'.$this->createFilename());
}
/**
* Checks if the cache folder exists, and if not, it creates it *
*/
private function cacheFolder() {
if (!is_dir(JPATH_SITE.'/cache/images'))
{
try {
Folder::create(JPATH_SITE.'/cache/images');
}
catch (Exception $e)
{
echo 'Caught exception: ', $e->getMessage(), "\n";
}
}
}
/**
* @param $image
* Saves the image
* @throws ErrorException
*/
private function saveImage($image) {
$this->cacheFolder();
imageinterlace($image, true);
$saved = imagejpeg($image, JPATH_SITE . '/cache/images/' . $this->createFilename(), $this->variables['quality']);
if ($saved == false) {
throw new ErrorException('Cannot save file, please check directory and permissions');
}
imagedestroy($image);
}
/**
* @param $image
* Processes the image, unless it is already in the cache
* @throws ErrorException
* @returns string
*/
private function processImage($image) {
if (($this->variables['cache'] == true) and $this->checkCache()) {
return false;
}
else {
try {
$newImage = $this->openImage($image);
$newImage = $this->resizeImage($newImage);
$this->saveImage($newImage);
}
catch (Exception $e) {
echo 'Caught exception: ', $e->getMessage(), "\n";
}
}
}
/**
* Method to process the image and get the new image's URL
*/
public function get() {
$this->processImage($this->image);
return Uri::root(true).'/cache/images/'.$this->createFilename();
}
}