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<?php
namespace Zotlabs\Thumbs;
use SebLucas\EPubMeta\EPub;
use GdImage;
/**
* Thumbnail creation for epub files.
*/
class Epubthumb {
/**
* Match for application/epub+zip.
*
* @param string $type MimeType
* @return boolean
*/
function Match(string $type): bool {
return $type === 'application/epub+zip';
}
/**
* Create the thumbnail if the Epub has a cover.
*
* @param array $attach
* @param number $preview_style unused
* @param number $height (optional) default 300
* @param number $width (optional) default 300
*
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
function Thumb($attach, $preview_style, $height = 300, $width = 300) {
$file = dbunescbin($attach['content']);
if (!$file) {
return;
}
$image = $this->getCover($file);
if ($image) {
$srcwidth = imagesx($image);
$srcheight = imagesy($image);
$dest = imagecreatetruecolor($width, $height);
imagealphablending($dest, false);
imagesavealpha($dest, true);
imagecopyresampled($dest, $image, 0, 0, 0, 0, $width, $height, $srcwidth, $srcheight);
imagejpeg($dest, "{$file}.thumb");
imagedestroy($image);
imagedestroy($dest);
}
}
private function getCover(string $filename): GdImage|false {
$epub = new EPub($filename);
$cover = $epub->getCover();
if (! empty($cover)) {
return imagecreatefromstring($cover);
} else {
return false;
}
}
}
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