105 lines
2.6 KiB
PHP
105 lines
2.6 KiB
PHP
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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 Ashot Khanamiryan
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* @author Smiley <smiley@chillerlan.net>
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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\Common;
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use chillerlan\QRCode\Decoder\QRCodeDecoderException;
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use chillerlan\QRCode\QROptions;
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use chillerlan\Settings\SettingsContainerInterface;
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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.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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abstract class LuminanceSourceAbstract implements LuminanceSourceInterface{
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/** @var \chillerlan\QRCode\QROptions|\chillerlan\Settings\SettingsContainerInterface */
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protected SettingsContainerInterface $options;
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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, SettingsContainerInterface $options = null){
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$this->width = $width;
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$this->height = $height;
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$this->options = ($options ?? new QROptions);
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$this->luminances = [];
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}
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/** @inheritDoc */
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public function getLuminances():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 >= $this->getHeight()){
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throw new QRCodeDecoderException('Requested row is outside the image: '.$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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* @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
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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 QRCodeDecoderException('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 QRCodeDecoderException('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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