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<?php
namespace Intervention\Image\Gd;
use Intervention\Image\Exception\NotSupportedException;
use Intervention\Image\Image;
class Driver extends \Intervention\Image\AbstractDriver
{
/**
* Creates new instance of driver
*
* @param Decoder $decoder
* @param Encoder $encoder
*/
public function __construct(Decoder $decoder = null, Encoder $encoder = null)
{
if ( ! $this->coreAvailable()) {
throw new NotSupportedException(
"GD Library extension not available with this PHP installation."
);
}
$this->decoder = $decoder ? $decoder : new Decoder;
$this->encoder = $encoder ? $encoder : new Encoder;
}
/**
* Creates new image instance
*
* @param int $width
* @param int $height
* @param mixed $background
* @return \Intervention\Image\Image
*/
public function newImage($width, $height, $background = null)
{
// create empty resource
$core = imagecreatetruecolor($width, $height);
$image = new Image(new static, $core);
// set background color
$background = new Color($background);
imagefill($image->getCore(), 0, 0, $background->getInt());
return $image;
}
/**
* Reads given string into color object
*
* @param string $value
* @return AbstractColor
*/
public function parseColor($value)
{
return new Color($value);
}
/**
* Checks if core module installation is available
*
* @return boolean
*/
protected function coreAvailable()
{
return (extension_loaded('gd') && function_exists('gd_info'));
}
/**
* Returns clone of given core
*
* @return mixed
*/
public function cloneCore($core)
{
$width = imagesx($core);
$height = imagesy($core);
$clone = imagecreatetruecolor($width, $height);
imagealphablending($clone, false);
imagesavealpha($clone, true);
$transparency = imagecolorallocatealpha($clone, 0, 0, 0, 127);
imagefill($clone, 0, 0, $transparency);
imagecopy($clone, $core, 0, 0, 0, 0, $width, $height);
return $clone;
}
}
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