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<?php
/**
* Class GDLuminanceSource
*
* @created 17.01.2021
* @author Ashot Khanamiryan
* @author Smiley <smiley@chillerlan.net>
* @copyright 2021 Smiley
* @license MIT
*
* @noinspection PhpComposerExtensionStubsInspection
*/
namespace chillerlan\QRCode\Common;
use chillerlan\QRCode\Decoder\QRCodeDecoderException;
use chillerlan\Settings\SettingsContainerInterface;
use function file_get_contents, get_resource_type, imagecolorat, imagecolorsforindex,
imagecreatefromstring, imagefilter, imagesx, imagesy, is_resource;
use const IMG_FILTER_BRIGHTNESS, IMG_FILTER_CONTRAST, IMG_FILTER_GRAYSCALE, IMG_FILTER_NEGATE, PHP_MAJOR_VERSION;
/**
* This class is used to help decode images from files which arrive as GD Resource
* It does not support rotation.
*/
class GDLuminanceSource extends LuminanceSourceAbstract{
/**
* @var resource|\GdImage
*/
protected $gdImage;
/**
* GDLuminanceSource constructor.
*
* @param resource|\GdImage $gdImage
* @param \chillerlan\Settings\SettingsContainerInterface|null $options
*
* @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
*/
public function __construct($gdImage, ?SettingsContainerInterface $options = null){
/** @noinspection PhpFullyQualifiedNameUsageInspection */
if(
(PHP_MAJOR_VERSION >= 8 && !$gdImage instanceof \GdImage) // @todo: remove version check in v6
|| (PHP_MAJOR_VERSION < 8 && (!is_resource($gdImage) || get_resource_type($gdImage) !== 'gd'))
){
throw new QRCodeDecoderException('Invalid GD image source.'); // @codeCoverageIgnore
}
parent::__construct(imagesx($gdImage), imagesy($gdImage), $options);
$this->gdImage = $gdImage;
if($this->options->readerGrayscale){
imagefilter($this->gdImage, IMG_FILTER_GRAYSCALE);
}
if($this->options->readerInvertColors){
imagefilter($this->gdImage, IMG_FILTER_NEGATE);
}
if($this->options->readerIncreaseContrast){
imagefilter($this->gdImage, IMG_FILTER_BRIGHTNESS, -100);
imagefilter($this->gdImage, IMG_FILTER_CONTRAST, -100);
}
$this->setLuminancePixels();
}
/**
*
*/
protected function setLuminancePixels():void{
for($j = 0; $j < $this->height; $j++){
for($i = 0; $i < $this->width; $i++){
$argb = imagecolorat($this->gdImage, $i, $j);
$pixel = imagecolorsforindex($this->gdImage, $argb);
$this->setLuminancePixel($pixel['red'], $pixel['green'], $pixel['blue']);
}
}
}
/** @inheritDoc */
public static function fromFile(string $path, ?SettingsContainerInterface $options = null):self{
return new self(imagecreatefromstring(file_get_contents(self::checkFile($path))), $options);
}
/** @inheritDoc */
public static function fromBlob(string $blob, ?SettingsContainerInterface $options = null):self{
return new self(imagecreatefromstring($blob), $options);
}
}
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