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pixelfed/app/Util/Media/Blurhash.php

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<?php
namespace App\Util\Media;
use App\Util\Blurhash\Blurhash as BlurhashEngine;
use App\Media;
class Blurhash {
const DEFAULT_HASH = 'U4Rfzst8?bt7ogayj[j[~pfQ9Goe%Mj[WBay';
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public static function generate(Media $media)
{
if(!in_array($media->mime, ['image/png', 'image/jpeg', 'video/mp4'])) {
return self::DEFAULT_HASH;
}
if($media->thumbnail_path == null) {
return self::DEFAULT_HASH;
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}
$file = storage_path('app/' . $media->thumbnail_path);
if(!is_file($file)) {
return self::DEFAULT_HASH;
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}
$image = imagecreatefromstring(file_get_contents($file));
if(!$image) {
return self::DEFAULT_HASH;
}
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$width = imagesx($image);
$height = imagesy($image);
$pixels = [];
for ($y = 0; $y < $height; ++$y) {
$row = [];
for ($x = 0; $x < $width; ++$x) {
$index = imagecolorat($image, $x, $y);
$colors = imagecolorsforindex($image, $index);
$row[] = [$colors['red'], $colors['green'], $colors['blue']];
}
$pixels[] = $row;
}
$components_x = 4;
$components_y = 4;
$blurhash = BlurhashEngine::encode($pixels, $components_x, $components_y);
if(strlen($blurhash) > 191) {
return self::DEFAULT_HASH;
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}
return $blurhash;
}
}