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<?php
namespace Intervention\Image;
use Intervention\Image\Exception\InvalidArgumentException;
use Intervention\Image\Exception\NotSupportedException;
abstract class AbstractEncoder
{
/**
* Buffer of encode result data
*
* @var string
*/
public $result;
/**
* Image object to encode
*
* @var Image
*/
public $image;
/**
* Output format of encoder instance
*
* @var string
*/
public $format;
/**
* Output quality of encoder instance
*
* @var int
*/
public $quality;
/**
* Processes and returns encoded image as JPEG string
*
* @return string
*/
abstract protected function processJpeg();
/**
* Processes and returns encoded image as PNG string
*
* @return string
*/
abstract protected function processPng();
/**
* Processes and returns encoded image as GIF string
*
* @return string
*/
abstract protected function processGif();
/**
* Processes and returns encoded image as TIFF string
*
* @return string
*/
abstract protected function processTiff();
/**
* Processes and returns encoded image as BMP string
*
* @return string
*/
abstract protected function processBmp();
/**
* Processes and returns encoded image as ICO string
*
* @return string
*/
abstract protected function processIco();
/**
* Processes and returns image as WebP encoded string
*
* @return string
*/
abstract protected function processWebp();
/**
* Processes and returns image as Avif encoded string
*
* @return string
*/
abstract protected function processAvif();
/**
* Processes and returns image as Heic encoded string
*
* @return string
*/
abstract protected function processHeic();
/**
* Process a given image
*
* @param Image $image
* @param string $format
* @param int $quality
* @return Image
*/
public function process(Image $image, $format = null, $quality = null)
{
$this->setImage($image);
$this->setFormat($format);
$this->setQuality($quality);
switch (strtolower($this->format)) {
case 'data-url':
$this->result = $this->processDataUrl();
break;
case 'gif':
case 'image/gif':
$this->result = $this->processGif();
break;
case 'png':
case 'image/png':
case 'image/x-png':
$this->result = $this->processPng();
break;
case 'jpg':
case 'jpeg':
case 'jfif':
case 'image/jp2':
case 'image/jpg':
case 'image/jpeg':
case 'image/pjpeg':
case 'image/jfif':
$this->result = $this->processJpeg();
break;
case 'tif':
case 'tiff':
case 'image/tiff':
case 'image/tif':
case 'image/x-tif':
case 'image/x-tiff':
$this->result = $this->processTiff();
break;
case 'bmp':
case 'ms-bmp':
case 'x-bitmap':
case 'x-bmp':
case 'x-ms-bmp':
case 'x-win-bitmap':
case 'x-windows-bmp':
case 'x-xbitmap':
case 'image/ms-bmp':
case 'image/x-bitmap':
case 'image/x-bmp':
case 'image/x-ms-bmp':
case 'image/x-win-bitmap':
case 'image/x-windows-bmp':
case 'image/x-xbitmap':
$this->result = $this->processBmp();
break;
case 'ico':
case 'image/x-ico':
case 'image/x-icon':
case 'image/vnd.microsoft.icon':
$this->result = $this->processIco();
break;
case 'psd':
case 'image/vnd.adobe.photoshop':
$this->result = $this->processPsd();
break;
case 'webp':
case 'image/webp':
case 'image/x-webp':
$this->result = $this->processWebp();
break;
case 'avif':
case 'image/avif':
$this->result = $this->processAvif();
break;
case 'heic':
case 'image/heic':
case 'image/heif':
$this->result = $this->processHeic();
break;
default:
throw new NotSupportedException(
"Encoding format ({$this->format}) is not supported."
);
}
$this->setImage(null);
return $image->setEncoded($this->result);
}
/**
* Processes and returns encoded image as data-url string
*
* @return string
*/
protected function processDataUrl()
{
$mime = $this->image->mime ? $this->image->mime : 'image/png';
return sprintf('data:%s;base64,%s',
$mime,
base64_encode($this->process($this->image, $mime, $this->quality))
);
}
/**
* Sets image to process
*
* @param Image $image
*/
protected function setImage($image)
{
$this->image = $image;
}
/**
* Determines output format
*
* @param string $format
*/
protected function setFormat($format = null)
{
if ($format == '' && $this->image instanceof Image) {
$format = $this->image->mime;
}
$this->format = $format ? $format : 'jpg';
return $this;
}
/**
* Determines output quality
*
* @param int $quality
*/
protected function setQuality($quality)
{
$quality = is_null($quality) ? 90 : $quality;
$quality = $quality === 0 ? 1 : $quality;
if ($quality < 0 || $quality > 100) {
throw new InvalidArgumentException(
'Quality must range from 0 to 100.'
);
}
$this->quality = intval($quality);
return $this;
}
}
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