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<?php |
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/** |
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* Class LuminanceSourceAbstract |
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* |
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* @created 24.01.2021 |
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* @author ZXing Authors |
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* @author Smiley <[email protected]> |
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* @copyright 2021 Smiley |
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* @license Apache-2.0 |
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*/ |
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namespace chillerlan\QRCode\Decoder; |
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use InvalidArgumentException; |
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use function array_slice, array_splice, file_exists, is_file, is_readable, realpath; |
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/** |
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* The purpose of this class hierarchy is to abstract different bitmap implementations across |
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* platforms into a standard interface for requesting greyscale luminance values. The interface |
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* only provides immutable methods; therefore crop and rotation create copies. This is to ensure |
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* that one Reader does not modify the original luminance source and leave it in an unknown state |
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* for other Readers in the chain. |
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* |
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* @author [email protected] (Daniel Switkin) |
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*/ |
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abstract class LuminanceSourceAbstract implements LuminanceSourceInterface{ |
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protected array $luminances; |
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protected int $width; |
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protected int $height; |
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/** |
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* |
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*/ |
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public function __construct(int $width, int $height){ |
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$this->width = $width; |
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$this->height = $height; |
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// In order to measure pure decoding speed, we convert the entire image to a greyscale array |
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// up front, which is the same as the Y channel of the YUVLuminanceSource in the real app. |
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$this->luminances = []; |
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} |
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/** @inheritDoc */ |
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public function getMatrix():array{ |
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return $this->luminances; |
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} |
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/** @inheritDoc */ |
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public function getWidth():int{ |
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return $this->width; |
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} |
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/** @inheritDoc */ |
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public function getHeight():int{ |
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return $this->height; |
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} |
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/** @inheritDoc */ |
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public function getRow(int $y):array{ |
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if($y < 0 || $y >= $this->getHeight()){ |
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throw new InvalidArgumentException('Requested row is outside the image: '.$y); |
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} |
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$arr = []; |
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array_splice($arr, 0, $this->width, array_slice($this->luminances, $y * $this->width, $this->width)); |
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return $arr; |
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} |
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/** |
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* |
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*/ |
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protected function setLuminancePixel(int $r, int $g, int $b):void{ |
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$this->luminances[] = $r === $g && $g === $b |
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// Image is already greyscale, so pick any channel. |
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? $r // (($r + 128) % 256) - 128; |
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// Calculate luminance cheaply, favoring green. |
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: ($r + 2 * $g + $b) / 4; // (((($r + 2 * $g + $b) / 4) + 128) % 256) - 128; |
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} |
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/** |
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* |
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*/ |
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protected static function checkFile(string $path):string{ |
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$path = trim($path); |
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if(!file_exists($path) || !is_file($path) || !is_readable($path)){ |
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throw new InvalidArgumentException('invalid file: '.$path); |
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} |
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$realpath = realpath($path); |
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if($realpath === false){ |
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throw new InvalidArgumentException('unable to resolve path: '.$path); |
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} |
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return $realpath; |
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} |
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} |
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chillerlan /
php-qrcode
