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119 lines
3.4 KiB
119 lines
3.4 KiB
<?php |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Joas Schilling <coding@schilljs.com> |
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* @author Morris Jobke <hey@morrisjobke.de> |
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* @author Olivier Paroz <github@oparoz.com> |
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* @author Roeland Jago Douma <roeland@famdouma.nl> |
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* |
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* @license AGPL-3.0 |
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* |
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* This code 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, version 3, |
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* as published by the Free Software Foundation. |
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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, version 3, |
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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 Imagick; |
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use OCP\IImage; |
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use OCP\ILogger; |
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use OCP\Files\File; |
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/** |
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* Creates a PNG preview using ImageMagick via the PECL extension |
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* |
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* @package OC\Preview |
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*/ |
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abstract class Bitmap extends ProviderV2 { |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage { |
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$tmpPath = $this->getLocalFile($file); |
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// Creates \Imagick object from bitmap or vector file |
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try { |
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$bp = $this->getResizedPreview($tmpPath, $maxX, $maxY); |
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} catch (\Exception $e) { |
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\OC::$server->getLogger()->logException($e, [ |
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'message' => 'File: ' . $file->getPath() . ' Imagick says:', |
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'level' => ILogger::ERROR, |
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'app' => 'core', |
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]); |
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return null; |
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} |
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$this->cleanTmpFiles(); |
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//new bitmap image object |
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$image = new \OC_Image(); |
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$image->loadFromData($bp); |
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//check if image object is valid |
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return $image->valid() ? $image : null; |
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} |
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/** |
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* Returns a preview of maxX times maxY dimensions in PNG format |
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* |
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* * The default resolution is already 72dpi, no need to change it for a bitmap output |
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* * It's possible to have proper colour conversion using profileimage(). |
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* ICC profiles are here: http://www.color.org/srgbprofiles.xalter |
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* * It's possible to Gamma-correct an image via gammaImage() |
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* |
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* @param string $tmpPath the location of the file to convert |
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* @param int $maxX |
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* @param int $maxY |
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* |
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* @return \Imagick |
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*/ |
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private function getResizedPreview($tmpPath, $maxX, $maxY) { |
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$bp = new Imagick(); |
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// Layer 0 contains either the bitmap or a flat representation of all vector layers |
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$bp->readImage($tmpPath . '[0]'); |
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$bp = $this->resize($bp, $maxX, $maxY); |
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$bp->setImageFormat('png'); |
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return $bp; |
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} |
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/** |
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* Returns a resized \Imagick object |
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* |
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* If you want to know more on the various methods available to resize an |
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* image, check out this link : @link https://stackoverflow.com/questions/8517304/what-the-difference-of-sample-resample-scale-resize-adaptive-resize-thumbnail-im |
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* |
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* @param \Imagick $bp |
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* @param int $maxX |
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* @param int $maxY |
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* |
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* @return \Imagick |
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*/ |
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private function resize($bp, $maxX, $maxY) { |
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list($previewWidth, $previewHeight) = array_values($bp->getImageGeometry()); |
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// We only need to resize a preview which doesn't fit in the maximum dimensions |
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if ($previewWidth > $maxX || $previewHeight > $maxY) { |
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// TODO: LANCZOS is the default filter, CATROM could bring similar results faster |
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$bp->resizeImage($maxX, $maxY, imagick::FILTER_LANCZOS, 1, true); |
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} |
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return $bp; |
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} |
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}
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