355 lines
9 KiB
PHP
355 lines
9 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, Roeland Jago Douma <roeland@famdouma.nl>
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*
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* @author Roeland Jago Douma <roeland@famdouma.nl>
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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\Preview;
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use OCP\Files\File;
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use OCP\Files\IAppData;
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use OCP\Files\NotFoundException;
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use OCP\Files\SimpleFS\ISimpleFile;
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use OCP\Files\SimpleFS\ISimpleFolder;
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use OCP\IConfig;
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use OCP\IImage;
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use OCP\IPreview;
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use OCP\Preview\IProvider;
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use Symfony\Component\EventDispatcher\EventDispatcherInterface;
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use Symfony\Component\EventDispatcher\GenericEvent;
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class Generator {
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/** @var IPreview */
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private $previewManager;
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/** @var IConfig */
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private $config;
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/** @var IAppData */
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private $appData;
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/** @var GeneratorHelper */
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private $helper;
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/** @var EventDispatcherInterface */
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private $eventDispatcher;
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/**
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* @param IConfig $config
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* @param IPreview $previewManager
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* @param IAppData $appData
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* @param GeneratorHelper $helper
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* @param EventDispatcherInterface $eventDispatcher
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*/
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public function __construct(
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IConfig $config,
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IPreview $previewManager,
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IAppData $appData,
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GeneratorHelper $helper,
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EventDispatcherInterface $eventDispatcher
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) {
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$this->config = $config;
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$this->previewManager = $previewManager;
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$this->appData = $appData;
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$this->helper = $helper;
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$this->eventDispatcher = $eventDispatcher;
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}
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/**
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* Returns a preview of a file
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*
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* The cache is searched first and if nothing usable was found then a preview is
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* generated by one of the providers
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*
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* @param File $file
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mode
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* @param string $mimeType
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* @return ISimpleFile
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* @throws NotFoundException
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*/
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public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
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$this->eventDispatcher->dispatch(
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IPreview::EVENT,
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new GenericEvent($file,[
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'width' => $width,
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'height' => $height,
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'crop' => $crop,
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'mode' => $mode
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])
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);
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if ($mimeType === null) {
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$mimeType = $file->getMimeType();
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}
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if (!$this->previewManager->isMimeSupported($mimeType)) {
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throw new NotFoundException();
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}
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$previewFolder = $this->getPreviewFolder($file);
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// Get the max preview and infer the max preview sizes from that
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$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
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list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);
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// Calculate the preview size
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list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
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// Try to get a cached preview. Else generate (and store) one
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try {
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$file = $this->getCachedPreview($previewFolder, $width, $height, $crop);
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} catch (NotFoundException $e) {
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$file = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight);
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}
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return $file;
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param File $file
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* @param string $mimeType
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* @return ISimpleFile
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* @throws NotFoundException
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*/
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private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType) {
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$nodes = $previewFolder->getDirectoryListing();
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foreach ($nodes as $node) {
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if (strpos($node->getName(), 'max')) {
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return $node;
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}
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}
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$previewProviders = $this->previewManager->getProviders();
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foreach ($previewProviders as $supportedMimeType => $providers) {
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if (!preg_match($supportedMimeType, $mimeType)) {
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continue;
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}
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foreach ($providers as $provider) {
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$provider = $this->helper->getProvider($provider);
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if (!($provider instanceof IProvider)) {
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continue;
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}
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$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 2048);
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$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 2048);
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$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
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if (!($preview instanceof IImage)) {
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continue;
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}
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$path = strval($preview->width()) . '-' . strval($preview->height()) . '-max.png';
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$file = $previewFolder->newFile($path);
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$file->putContent($preview->data());
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return $file;
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}
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}
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throw new NotFoundException();
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}
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/**
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* @param ISimpleFile $file
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* @return int[]
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*/
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private function getPreviewSize(ISimpleFile $file) {
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$size = explode('-', $file->getName());
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return [(int)$size[0], (int)$size[1]];
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}
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/**
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @return string
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*/
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private function generatePath($width, $height, $crop) {
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$path = strval($width) . '-' . strval($height);
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if ($crop) {
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$path .= '-crop';
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}
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$path .= '.png';
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return $path;
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}
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/**
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param string $mode
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* @param int $maxWidth
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* @param int $maxHeight
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* @return int[]
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*/
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private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {
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/*
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* If we are not cropping we have to make sure the requested image
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* respects the aspect ratio of the original.
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*/
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if (!$crop) {
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$ratio = $maxHeight / $maxWidth;
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if ($width === -1) {
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$width = $height / $ratio;
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}
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if ($height === -1) {
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$height = $width * $ratio;
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}
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$ratioH = $height / $maxHeight;
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$ratioW = $width / $maxWidth;
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/*
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* Fill means that the $height and $width are the max
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* Cover means min.
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*/
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if ($mode === IPreview::MODE_FILL) {
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if ($ratioH > $ratioW) {
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$height = $width * $ratio;
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} else {
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$width = $height / $ratio;
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}
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} else if ($mode === IPreview::MODE_COVER) {
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if ($ratioH > $ratioW) {
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$width = $height / $ratio;
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} else {
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$height = $width * $ratio;
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}
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}
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}
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if ($height !== $maxHeight && $width !== $maxWidth) {
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/*
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* Scale to the nearest power of two
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*/
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$pow2height = pow(2, ceil(log($height) / log(2)));
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$pow2width = pow(2, ceil(log($width) / log(2)));
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$ratioH = $height / $pow2height;
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$ratioW = $width / $pow2width;
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if ($ratioH < $ratioW) {
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$width = $pow2width;
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$height = $height / $ratioW;
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} else {
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$height = $pow2height;
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$width = $width / $ratioH;
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}
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}
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/*
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* Make sure the requested height and width fall within the max
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* of the preview.
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*/
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if ($height > $maxHeight) {
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$ratio = $height / $maxHeight;
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$height = $maxHeight;
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$width = $width / $ratio;
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}
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if ($width > $maxWidth) {
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$ratio = $width / $maxWidth;
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$width = $maxWidth;
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$height = $height / $ratio;
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}
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return [(int)round($width), (int)round($height)];
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param ISimpleFile $maxPreview
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @param int $maxWidth
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* @param int $maxHeight
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* @return ISimpleFile
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* @throws NotFoundException
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*/
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private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight) {
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$preview = $this->helper->getImage($maxPreview);
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if ($crop) {
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if ($height !== $preview->height() && $width !== $preview->width()) {
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//Resize
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$widthR = $preview->width() / $width;
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$heightR = $preview->height() / $height;
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if ($widthR > $heightR) {
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$scaleH = $height;
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$scaleW = $maxWidth / $heightR;
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} else {
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$scaleH = $maxHeight / $widthR;
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$scaleW = $width;
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}
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$preview->preciseResize(round($scaleW), round($scaleH));
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}
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$cropX = floor(abs($width - $preview->width()) * 0.5);
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$cropY = 0;
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$preview->crop($cropX, $cropY, $width, $height);
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} else {
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$preview->resize(max($width, $height));
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}
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$path = $this->generatePath($width, $height, $crop);
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$file = $previewFolder->newFile($path);
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$file->putContent($preview->data());
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return $file;
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}
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/**
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* @param ISimpleFolder $previewFolder
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* @param int $width
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* @param int $height
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* @param bool $crop
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* @return ISimpleFile
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*
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* @throws NotFoundException
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*/
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private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop) {
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$path = $this->generatePath($width, $height, $crop);
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return $previewFolder->getFile($path);
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}
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/**
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* Get the specific preview folder for this file
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*
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* @param File $file
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* @return ISimpleFolder
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*/
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private function getPreviewFolder(File $file) {
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try {
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$folder = $this->appData->getFolder($file->getId());
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} catch (NotFoundException $e) {
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$folder = $this->appData->newFolder($file->getId());
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}
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return $folder;
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}
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}
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