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<?php
/**
* @package com_zoo
* @author YOOtheme http://www.yootheme.com
* @copyright Copyright (C) YOOtheme GmbH
* @license http://www.gnu.org/licenses/gpl.html GNU/GPL
*/
/**
* Image thumbnail helper class.
*
* @package Component.Helpers
* @since 2.0
*/
class ImageThumbnailHelper extends AppHelper {
/**
* Creates an AppImageThumbnail instance
*
* @param string $file The filepath
*
* @return AppImageThumbnail
*
* @since 2.0
*/
public function create($file) {
return $this->app->object->create('AppImageThumbnail', array($file));
}
/**
* Checks for the required php functions
*
* @return boolean
*
* @since 2.0
*/
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;
}
}
/**
* Image thumbnail class.
*
* @package Component.Helpers
* @since 2.0
*/
class AppImageThumbnail {
/**
* App instance
*
* @var App
* @since 2.0
*/
public $app;
/**
* The image file path
* @var string
*/
public $img_file;
/**
* The image format
* @var string
*/
public $img_format;
/**
* The image source
* @var resource
*/
public $img_source;
/**
* The image width
* @var string
*/
public $img_width;
/**
* The image height
* @var string
*/
public $img_height;
/**
* The thumb width
* @var string
*/
public $thumb_width;
/**
* The thumb height
* @var string
*/
public $thumb_height;
/**
* The thumb resize
* @var boolean
*/
public $thumb_resize;
/**
* The thumb quality
* @var int
*/
public $thumb_quality;
/**
* Class constructor
*
* @param string $file The file path.
* @since 2.0
*/
public function __construct($file) {
$this->img_file = $file;
$this->thumb_resize = true;
$this->thumb_quality = 90;
// get image info
list($width, $height, $type, $attr) = @getimagesize($this->img_file, $info);
// set image dimensions and type
if (is_array($info)) {
$this->img_width = $width;
$this->img_height = $height;
$this->thumb_width = $width;
$this->thumb_height = $height;
switch ($type) {
case 1:
$this->img_format = 'gif';
$this->img_source = imagecreatefromgif($this->img_file);
break;
case 2:
$this->img_format = 'jpeg';
$this->img_source = imagecreatefromjpeg($this->img_file);
break;
case 3:
$this->img_format = 'png';
$this->img_source = imagecreatefrompng($this->img_file);
break;
default:
$this->img_format = null;
$this->img_source = null;
break;
}
}
}
/**
* Set resize
*
* @param boolean $resize Resize value
*
* @return void
* @since 2.0
*/
public function setResize($resize) {
$this->thumb_resize = $resize;
}
/**
* Set thumb dimensions
*
* @param int $width
* @param int $height
*
* @return void
* @since 2.0
*/
public function setSize($width, $height) {
$this->thumb_width = $width;
$this->thumb_height = $height;
}
/**
* Size thumb width
*
* @param int $width
*
* @return void
* @since 2.0
*/
public function sizeWidth($width) {
$this->thumb_width = $width;
$this->thumb_height = @($width / $this->img_width) * $this->img_height;
}
/**
* Size thumb height
*
* @param int $height
*
* @return void
* @since 2.0
*/
public function sizeHeight($height) {
$this->thumb_width = @($height / $this->img_height) * $this->img_width;
$this->thumb_height = $height;
}
/**
* Save file
*
* @param string $file the file to save
*
* @return boolean true on success
* @since 2.0
*/
public function save($file) {
$return = false;
if ($this->img_format) {
$src = $this->img_source;
$src_x = 0;
$src_y = 0;
// smart resize thumbnail image
if ($this->thumb_resize) {
$resized_width = @($this->thumb_height / $this->img_height) * $this->img_width;
$resized_height = @($this->thumb_width / $this->img_width) * $this->img_height;
if ($this->thumb_width <= $resized_width) {
$width = $resized_width;
$height = $this->thumb_height;
$src_x = intval(($resized_width - $this->thumb_width) / 2);
} else {
$width = $this->thumb_width;
$height = $resized_height;
$src_y = intval(($resized_height - $this->thumb_height) / 2);
}
$src = imagecreatetruecolor($width, $height);
// save transparent colors
if ($this->img_format == 'png') {
imagecolortransparent($src, imagecolorallocate($src, 0, 0, 0));
imagealphablending($src, false);
imagesavealpha($src, true);
}
// get and reallocate transparency-color for gif
if ($this->img_format == 'gif') {
imagealphablending($src, false);
$transindex = imagecolortransparent($this->img_source) <= imagecolorstotal($src) ? imagecolortransparent($this->img_source) : imagecolorstotal($src);
if ($transindex >= 0) {
$transcol = imagecolorsforindex($this->img_source, $transindex);
$transindex = imagecolorallocatealpha($src, $transcol['red'], $transcol['green'], $transcol['blue'], 127);
imagefill($src, 0, 0, $transindex);
}
}
if (function_exists('imagecopyresampled')) {
@imagecopyresampled($src, $this->img_source, 0, 0, 0, 0, $width, $height, $this->img_width, $this->img_height);
} else {
@imagecopyresized($src, $this->img_source, 0, 0, 0, 0, $width, $height, $this->img_width, $this->img_height);
}
// restore transparency for gif
if ($this->img_format == 'gif') {
if ($transindex >= 0) {
imagecolortransparent($src, $transindex);
for ($y=0; $y < imagesy($src); ++$y) {
for ($x=0; $x < imagesx($src); ++$x) {
if (((imagecolorat($src, $x, $y)>>24) & 0x7F) >= 100) {
imagesetpixel($src, $x, $y, $transindex);
}
}
}
}
}
}
// create thumbnail image
$thumbnail = imagecreatetruecolor($this->thumb_width, $this->thumb_height);
// save transparent colors for png
if ($this->img_format == 'png') {
imagecolortransparent($thumbnail, imagecolorallocate($src, 0, 0, 0));
imagealphablending($thumbnail, false);
imagesavealpha($thumbnail, true);
}
// get and reallocate transparency-color for gif
if ($this->img_format == 'gif') {
imagealphablending($thumbnail, false);
$transindex = imagecolortransparent($src);
if ($transindex >= 0) {
$transcol = imagecolorsforindex($src, $transindex);
$transindex = imagecolorallocatealpha($thumbnail, $transcol['red'], $transcol['green'], $transcol['blue'], 127);
imagefill($thumbnail, 0, 0, $transindex);
}
}
@imagecopy($thumbnail, $src, 0, 0, $src_x, $src_y, $this->thumb_width, $this->thumb_height);
// restore transparency for gif
if ($this->img_format == 'gif') {
if ($transindex >= 0) {
imagecolortransparent($thumbnail, $transindex);
for ($y=0; $y < imagesy($thumbnail); ++$y) {
for ($x=0; $x < imagesx($thumbnail); ++$x) {
if (((imagecolorat($thumbnail, $x, $y)>>24) & 0x7F) >= 100) {
imagesetpixel($thumbnail, $x, $y, $transindex);
}
}
}
}
}
// save thumbnail to file
ob_start();
switch ($this->img_format) {
case 'gif':
$return = imagegif($thumbnail);
break;
case 'jpeg':
$return = imagejpeg($thumbnail, null, $this->thumb_quality);
break;
case 'png':
$return = imagepng($thumbnail);
break;
}
$output = ob_get_contents();
ob_end_clean();
JFile::write($file, $output);
// free memory resources
imagedestroy($thumbnail);
imagedestroy($src);
}
return $return;
}
}