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<?php |
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/** |
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* This file is part of PhpAidc LabelPrinter package. |
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* |
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* © Appwilio (https://appwilio.com) |
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* © JhaoDa (https://github.com/jhaoda) |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace PhpAidc\LabelPrinter\Emulation; |
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final class RllCodec |
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{ |
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private const MAX_RUN_LENGTH = 127; |
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private const MAX_LINE_REPETITIONS = 128; |
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/** @var \Imagick */ |
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private $image; |
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public static function create(\Imagick $image): self |
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{ |
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return new self($image); |
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} |
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public function __construct(\Imagick $image) |
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{ |
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$this->image = $image; |
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} |
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public function encode(): string |
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{ |
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return \pack('C*', ...\array_merge(...$this->compressLines($this->scan()))); |
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} |
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private function scan(): \Generator |
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{ |
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foreach ((new \ImagickPixelIterator($this->image)) as $y => $line) { |
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$buffer = \array_reduce($line, static function ($carry, $pixel) { |
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$color = $pixel->getColor(); |
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$carry[] = 1 - ((int) (($color['r'] + $color['g'] + $color['b']) / 3) >> 7); |
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return $carry; |
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}, []); |
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yield $this->compressRuns($buffer); |
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} |
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} |
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private function compressRuns(array $line): array |
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{ |
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$prev = null; |
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$buffer = []; |
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$runLength = 0; |
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$size = \count($line); |
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foreach ($line as $i => $byte) { |
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if ($prev === null || $prev === $byte) { |
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$runLength++; |
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} else { |
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$this->encodeRun($buffer, $runLength); |
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$runLength = 1; |
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} |
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if ($i + 1 === $size) { |
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$this->encodeRun($buffer, $runLength); |
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} |
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$prev = $byte; |
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} |
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if ($line[0] === 1) { |
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\array_unshift($buffer, 0); |
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} |
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if (\end($line) === 1) { |
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$buffer[] = 0; |
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} |
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return $buffer; |
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} |
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private function encodeRun(array &$buffer, int $length) |
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{ |
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if ($length < self::MAX_RUN_LENGTH) { |
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$buffer[] = \max($length, 1); |
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return; |
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} |
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\array_map(static function () use (&$buffer) { |
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$buffer[] = self::MAX_RUN_LENGTH; |
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$buffer[] = 0; |
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}, \range(1, \intdiv($length, self::MAX_RUN_LENGTH))); |
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$buffer[] = $length % self::MAX_RUN_LENGTH; |
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} |
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private function compressLines(\Generator $lines): array |
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{ |
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$count = 1; |
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$line = []; |
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$buffer = []; |
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$prev = $lines->current(); |
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$lines->next(); |
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while ($lines->valid()) { |
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$line = $lines->current(); |
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if ($prev === $line) { |
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$count++; |
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$prev = $line; |
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$lines->next(); |
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continue; |
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} |
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$this->encodeLineRepetitions($buffer, $prev, $count); |
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$count = 1; |
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$prev = $line; |
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$lines->next(); |
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} |
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$this->encodeLineRepetitions($buffer, $line, $count); |
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return $buffer; |
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} |
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private function encodeLineRepetitions(array &$buffer, array $line, int $count): void |
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{ |
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if ($count <= 1) { |
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$buffer[] = $line; |
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} elseif ($count > 1 && $count <= self::MAX_LINE_REPETITIONS) { |
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$buffer[] = $this->buildLineRepetition($line, $count); |
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} else { |
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\array_map(function () use (&$buffer, $line) { |
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$buffer[] = $this->buildLineRepetition($line, self::MAX_LINE_REPETITIONS); |
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}, \range(1, \intdiv($count, self::MAX_LINE_REPETITIONS))); |
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$buffer[] = $this->buildLineRepetition($line, $count % self::MAX_LINE_REPETITIONS); |
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} |
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} |
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private function buildLineRepetition(array $line, int $count): array |
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{ |
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return \array_merge([-$count], $line, [-$count]); |
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} |
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} |
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php-aidc /
label-printer
