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Image thumbnail helper
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} ^/thumb/
RewriteRule ^(.*)$ thumb.php [QSA,L]
</IfModule>
<?php
/**
* Image transormation class
*
* @author artoodetoo
*/
class ImageHelper
{
const POS_LEFT = 1;
const POS_RIGHT = 2;
const POS_TOP = 4;
const POS_BOTTOM = 8;
const POS_HCENTER = 3;
const POS_VCENTER = 12;
const POS_CENTER = 15;
const POS_BOTTOM_RIGHT = 10;
private $fill_color = 0xFFFFFF;
private $jpg_quality = 85;
private $png_quality = 9;
private $padding = 5;
private $image;
private $width;
private $height;
private $type;
public function __construct(array $options = [], $filename = '')
{
foreach ($options as $key => $val) {
$this->$key = $val;
}
if (strlen($filename)) {
$this->load($filename);
}
}
public function __destruct()
{
$this->destroy();
}
public function load($filename)
{
$this->destroy();
if (!($size = @getimagesize($filename))) {
return false;
}
$this->type = substr($size['mime'], strpos($size['mime'], '/') + 1);
$func = 'imagecreatefrom'.$this->type;
if (!function_exists($func)) {
return false;
}
list($this->width, $this->height) = $size;
$this->image = $func($filename);
return $this;
}
public function save($filename)
{
switch ($this->type) {
case 'jpeg':
imagejpeg($this->image, $filename, $this->jpg_quality);
break;
case 'png':
imagepng($this->image, $filename, $this->png_quality, PNG_NO_FILTER);
break;
default:
$func = 'image'.$this->type;
$func($this->image, $filename);
break;
}
return $this;
}
public function render()
{
header('Content-Type: image/'.$this->type);
switch ($this->type) {
case 'jpeg':
imagejpeg($this->image, null, $this->jpg_quality);
break;
case 'png':
imagepng($this->image, null, $this->png_quality, PNG_NO_FILTER);
break;
default:
$ifunc = 'image'.$this->type;
$ifunc($this->image);
break;
}
return $this;
}
public function destroy()
{
if (isset($this->image)) {
imagedestroy($this->image);
}
unset($this->image, $this->type, $this->width, $this->height);
return $this;
}
/**
* Fit image to given rectange (no crop)
* @param int $maxWidth
* @param int $maxHeight
* @return \ImageHelper
*/
public function fit($maxWidth, $maxHeight)
{
$k = max($this->width / $maxWidth, $this->height / $maxHeight);
$newWidth = floor($this->width / $k);
$newHeight = floor($this->height / $k);
$newImage = imagecreatetruecolor($newWidth, $newHeight);
imagefill($newImage, 0, 0, $this->fill_color);
imagecopyresampled($newImage, $this->image, 0, 0, 0, 0, $newWidth, $newHeight, $this->width, $this->height);
imagedestroy($this->image);
$this->image = $newImage;
$this->width = $newWidth;
$this->height = $newHeight;
return $this;
}
/**
* Cover given rectangle by image (crop when required)
* @param int $maxWidth
* @param int $maxHeight
* @return \ImageHelper
*/
public function cover($maxWidth, $maxHeight)
{
$ratio = $maxWidth / $maxHeight;
$x = 0;
$y = 0;
$w = $this->width;
$h = $this->height;
if ($this->width / $ratio <= $this->height) {
$h = $w / $ratio;
$y = round(($this->height - $maxHeight * ($this->width / $maxWidth)) / 2);
} else {
$w = $h * $ratio;
$x = round(($this->width - $maxWidth * ($this->height / $maxHeight)) / 2);
}
$newImage = imagecreatetruecolor($maxWidth, $maxHeight);
imagefill($newImage, 0, 0, $this->fill_color);
imagecopyresampled($newImage, $this->image, 0, 0, $x, $y, $maxWidth, $maxHeight, $w, $h);
imagedestroy($this->image);
$this->image = $newImage;
$this->width = $maxWidth;
$this->height = $maxHeight;
return $this;
}
/**
* The same as fit() but crop too wide image
* @param int $maxWidth
* @param int $maxHeight
* @return \ImageHelper
*/
public function fitToHeight($maxWidth, $maxHeight)
{
if ($maxWidth / $maxHeight > $this->width / $this->height) {
return $this->fit($maxWidth, $maxHeight);
}
return $this->cover($maxWidth, $maxHeight);
}
/**
* The same as fit() but crop too high image
* @param int $maxWidth
* @param int $maxHeight
* @return \ImageHelper
*/
public function fitToWidth($maxWidth, $maxHeight)
{
if ($maxWidth / $maxHeight < $this->width / $this->height) {
return $this->fit($maxWidth, $maxHeight);
}
return $this->cover($maxWidth, $maxHeight);
}
public function addWatermark(ImageHelper $wm, $pos = self::POS_BOTTOM_RIGHT)
{
$wmWidth = $wm->getWidth();
$wmHeight = $wm->getHeight();
$x = $y = $this->padding;
if (($pos & self::POS_HCENTER) == self::POS_HCENTER) {
$x = ($this->width - $wmWidth) / 2;
} elseif ($pos & self::POS_RIGHT) {
$x = $this->width - ($wmWidth + $this->padding);
}
if (($pos & self::POS_VCENTER) == self::POS_VCENTER) {
$y = ($this->height - $wmHeight) / 2;
} elseif ($pos & self::POS_BOTTOM) {
$y = $this->height - ($wmHeight + $this->padding);
}
imagealphablending($this->image, true);
imagecopy($this->image, $wm->getImage(), $x, $y, 0, 0, $wmWidth, $wmHeight );
return $this;
}
public function getType()
{
return $this->type;
}
public function getWidth()
{
return $this->width;
}
public function getHeight()
{
return $this->height;
}
public function getImage()
{
return $this->image;
}
}
<?php
require __DIR__.'/include/bootstrap.php';
$name = basename(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH));
$source = App::get('upload_dir').'/'.$name;
$destin = App::get('thumbnail_dir').'/'.$name;
$image = new ImageHelper();
if (!file_exists($source) || !$image->load($source)) {
header('HTTP/1.0 404 Not Found');
exit('File not found');
}
$image
->fitToHeight(App::get('thumb_width'), App::get('thumb_height'))
->addWatermark(new ImageHelper([], App::get('watermark')))
->save($destin)
->render();
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