mirror of https://github.com/nextcloud/server.git
blurhash generation
Signed-off-by: Maxence Lange <maxence@artificial-owl.com>pull/41044/head
Maxence Lange
5 months ago
committed by
John Molakvoæ
parent
7c3936b6f8
commit
4367a5e633
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Subproject commit 5b8a5fc015968956a000d269561cb5ec9d931870
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Subproject commit a71bd8af76fdcfad78c865d1c60f6dde6e24f1dd
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@ -0,0 +1,164 @@
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<?php
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declare(strict_types=1);
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/**
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* @copyright 2024 Maxence Lange <maxence@artificial-owl.com>
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*
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* @author Maxence Lange <maxence@artificial-owl.com>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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namespace OC\Blurhash\Listener;
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use GdImage;
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use kornrunner\Blurhash\Blurhash;
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use OC\Files\Node\File;
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use OCP\EventDispatcher\Event;
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use OCP\EventDispatcher\IEventDispatcher;
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use OCP\EventDispatcher\IEventListener;
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use OCP\Files\GenericFileException;
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use OCP\Files\NotFoundException;
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use OCP\Files\NotPermittedException;
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use OCP\FilesMetadata\AMetadataEvent;
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use OCP\FilesMetadata\Event\MetadataBackgroundEvent;
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use OCP\FilesMetadata\Event\MetadataLiveEvent;
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use OCP\IPreview;
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use OCP\Lock\LockedException;
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/**
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* Generate a Blurhash string as metadata when image file is uploaded/edited.
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*
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* @template-implements IEventListener<AMetadataEvent>
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*/
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class GenerateBlurhashMetadata implements IEventListener {
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private const RESIZE_BOXSIZE = 300;
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private const COMPONENTS_X = 4;
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private const COMPONENTS_Y = 3;
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public function __construct(
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private IPreview $preview,
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) {
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}
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/**
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* @throws NotPermittedException
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* @throws GenericFileException
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* @throws LockedException
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*/
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public function handle(Event $event): void {
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if (!($event instanceof MetadataLiveEvent)
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&& !($event instanceof MetadataBackgroundEvent)) {
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return;
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}
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$file = $event->getNode();
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if (!($file instanceof File)) {
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return;
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}
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// too heavy to run on the live thread, request a rerun as a background job
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if ($event instanceof MetadataLiveEvent) {
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$event->requestBackgroundJob();
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return;
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}
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$image = false;
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try {
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// using preview image to generate the blurhash
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$preview = $this->preview->getPreview($file, 256, 256);
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$image = imagecreatefromstring($preview->getContent());
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} catch (NotFoundException $e) {
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// https://github.com/nextcloud/server/blob/9d70fd3e64b60a316a03fb2b237891380c310c58/lib/private/legacy/OC_Image.php#L668
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// The preview system can fail on huge picture, in that case we use our own image resizer.
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if (str_starts_with($file->getMimetype(), 'image/')) {
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$image = $this->resizedImageFromFile($file);
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}
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}
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if ($image === false) {
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return;
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}
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$metadata = $event->getMetadata();
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$metadata->setString('blurhash', $this->generateBlurHash($image));
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}
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/**
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* @param File $file
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*
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* @return GdImage|false
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* @throws GenericFileException
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* @throws NotPermittedException
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* @throws LockedException
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*/
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private function resizedImageFromFile(File $file): GdImage|false {
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$image = imagecreatefromstring($file->getContent());
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if ($image === false) {
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return false;
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}
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$currX = imagesx($image);
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$currY = imagesy($image);
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if ($currX > $currY) {
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$newX = self::RESIZE_BOXSIZE;
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$newY = intval($currY * $newX / $currX);
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} else {
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$newY = self::RESIZE_BOXSIZE;
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$newX = intval($currX * $newY / $currY);
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}
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$newImage = imagescale($image, $newX, $newY);
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return ($newImage !== false) ? $newImage : $image;
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}
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/**
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* @param GdImage $image
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*
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* @return string
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*/
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public function generateBlurHash(GdImage $image): string {
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$width = imagesx($image);
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$height = imagesy($image);
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$pixels = [];
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for ($y = 0; $y < $height; ++$y) {
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$row = [];
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for ($x = 0; $x < $width; ++$x) {
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$index = imagecolorat($image, $x, $y);
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$colors = imagecolorsforindex($image, $index);
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$row[] = [$colors['red'], $colors['green'], $colors['blue']];
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}
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$pixels[] = $row;
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}
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return Blurhash::encode($pixels, self::COMPONENTS_X, self::COMPONENTS_Y);
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}
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/**
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* @param IEventDispatcher $eventDispatcher
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*
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* @return void
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*/
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public static function loadListeners(IEventDispatcher $eventDispatcher): void {
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$eventDispatcher->addServiceListener(MetadataLiveEvent::class, self::class);
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$eventDispatcher->addServiceListener(MetadataBackgroundEvent::class, self::class);
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}
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}
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