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<?php
namespace Kanboard\Core;
/**
* Thumbnail Generator
*
* @package core
* @author Frederic Guillot
*/
class Thumbnail
{
protected $quality = 95;
protected $metadata = array();
protected $srcImage;
protected $dstImage;
/**
* Create a thumbnail from a local file
*
* @static
* @access public
* @param string $filename
* @return Thumbnail
*/
public static function createFromFile($filename)
{
$self = new static();
$self->fromFile($filename);
return $self;
}
/**
* Create a thumbnail from a string
*
* @static
* @access public
* @param string $blob
* @return Thumbnail
*/
public static function createFromString($blob)
{
$self = new static();
$self->fromString($blob);
return $self;
}
/**
* Load the local image file in memory with GD
*
* @access public
* @param string $filename
* @return Thumbnail
*/
public function fromFile($filename)
{
$this->metadata = getimagesize($filename);
$this->srcImage = imagecreatefromstring(file_get_contents($filename));
return $this;
}
/**
* Load the image blob in memory with GD
*
* @access public
* @param string $blob
* @return Thumbnail
*/
public function fromString($blob)
{
if (!function_exists('getimagesizefromstring')) {
$uri = 'data://application/octet-stream;base64,' . base64_encode($blob);
$this->metadata = getimagesize($uri);
} else {
$this->metadata = getimagesizefromstring($blob);
}
$this->srcImage = imagecreatefromstring($blob);
return $this;
}
/**
* Resize the image
*
* @access public
* @param int $width
* @param int $height
* @return Thumbnail
*/
public function resize($width = 250, $height = 100)
{
$srcWidth = $this->metadata[0];
$srcHeight = $this->metadata[1];
$dstX = 0;
$dstY = 0;
if ($width == 0 && $height == 0) {
$width = 100;
$height = 100;
}
if ($width > 0 && $height == 0) {
$dstWidth = $width;
$dstHeight = floor($srcHeight * ($width / $srcWidth));
$this->dstImage = imagecreatetruecolor($dstWidth, $dstHeight);
} elseif ($width == 0 && $height > 0) {
$dstWidth = floor($srcWidth * ($height / $srcHeight));
$dstHeight = $height;
$this->dstImage = imagecreatetruecolor($dstWidth, $dstHeight);
} else {
$srcRatio = $srcWidth / $srcHeight;
$resizeRatio = $width / $height;
if ($srcRatio <= $resizeRatio) {
$dstWidth = $width;
$dstHeight = floor($srcHeight * ($width / $srcWidth));
$dstY = ($dstHeight - $height) / 2 * (-1);
} else {
$dstWidth = floor($srcWidth * ($height / $srcHeight));
$dstHeight = $height;
$dstX = ($dstWidth - $width) / 2 * (-1);
}
$this->dstImage = imagecreatetruecolor($width, $height);
}
imagecopyresampled($this->dstImage, $this->srcImage, $dstX, $dstY, 0, 0, $dstWidth, $dstHeight, $srcWidth, $srcHeight);
return $this;
}
/**
* Save the thumbnail to a local file
*
* @access public
* @param string $filename
* @return Thumbnail
*/
public function toFile($filename)
{
imagejpeg($this->dstImage, $filename, $this->quality);
imagedestroy($this->dstImage);
imagedestroy($this->srcImage);
return $this;
}
/**
* Return the thumbnail as a string
*
* @access public
* @return string
*/
public function toString()
{
ob_start();
imagejpeg($this->dstImage, null, $this->quality);
imagedestroy($this->dstImage);
imagedestroy($this->srcImage);
return ob_get_clean();
}
/**
* Output the thumbnail directly to the browser or stdout
*
* @access public
*/
public function toOutput()
{
imagejpeg($this->dstImage, null, $this->quality);
imagedestroy($this->dstImage);
imagedestroy($this->srcImage);
}
}
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