77 lines
1.8 KiB
PHP
77 lines
1.8 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Intervention\Gif\Encoders;
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use Intervention\Gif\Blocks\CommentExtension;
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use Intervention\Gif\Blocks\FrameBlock;
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use Intervention\Gif\Exceptions\EncoderException;
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use Intervention\Gif\GifDataStream;
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class GifDataStreamEncoder extends AbstractEncoder
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{
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/**
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* Create new instance.
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*/
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public function __construct(GifDataStream $entity)
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{
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parent::__construct($entity);
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}
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/**
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* Encode current entity.
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*
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* @throws EncoderException
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*/
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public function encode(): string
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{
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return implode('', [
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$this->entity->header()->encode(),
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$this->entity->logicalScreenDescriptor()->encode(),
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$this->maybeEncodeGlobalColorTable(),
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$this->encodeFrames(),
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$this->encodeComments(),
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$this->entity->trailer()->encode(),
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]);
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}
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/**
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* Decode global color table if present in gif data.
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*/
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private function maybeEncodeGlobalColorTable(): string
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{
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if (!$this->entity->hasGlobalColorTable()) {
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return '';
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}
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return $this->entity->globalColorTable()->encode();
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}
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/**
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* Encode data blocks of source.
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*
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* @throws EncoderException
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*/
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private function encodeFrames(): string
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{
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return implode('', array_map(
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fn(FrameBlock $frame): string => $frame->encode(),
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$this->entity->frames(),
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));
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}
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/**
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* Encode comment extension blocks of source.
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*
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* @throws EncoderException
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*/
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private function encodeComments(): string
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{
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return implode('', array_map(
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fn(CommentExtension $commentExtension): string => $commentExtension->encode(),
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$this->entity->comments()
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));
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}
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}
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