Просмотр архива RotoR12


<?php

declare(strict_types=1);

namespace InterventionGifDecoders;

use InterventionGifAbstractExtension;
use InterventionGifBlocksColorTable;
use InterventionGifBlocksCommentExtension;
use InterventionGifBlocksFrameBlock;
use InterventionGifBlocksHeader;
use InterventionGifBlocksLogicalScreenDescriptor;
use InterventionGifBlocksTrailer;
use InterventionGifExceptionsDecoderException;
use InterventionGifGifDataStream;

class GifDataStreamDecoder extends AbstractDecoder
{
    /**
     * Decode current source to GifDataStream
     *
     * @throws DecoderException
     * @return GifDataStream
     */
    public function decode(): GifDataStream
    {
        $gif = new GifDataStream();

        $gif->setHeader(
            Header::decode($this->handle),
        );

        $gif->setLogicalScreenDescriptor(
            LogicalScreenDescriptor::decode($this->handle),
        );

        if ($gif->getLogicalScreenDescriptor()->hasGlobalColorTable()) {
            $length = $gif->getLogicalScreenDescriptor()->getGlobalColorTableByteSize();
            $gif->setGlobalColorTable(
                ColorTable::decode($this->handle, $length)
            );
        }

        while ($this->viewNextByte() !== Trailer::MARKER) {
            match ($this->viewNextBytes(2)) {
                // trailing "global" comment blocks which are not part of "FrameBlock"
                AbstractExtension::MARKER . CommentExtension::LABEL
                => $gif->addComment(
                    CommentExtension::decode($this->handle)
                ),
                default => $gif->addFrame(
                    FrameBlock::decode($this->handle)
                ),
            };
        }

        return $gif;
    }
}