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<?php |
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/** |
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* @author Joas Schilling <[email protected]> |
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* @author Morris Jobke <[email protected]> |
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* @author Olivier Paroz <[email protected]> |
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* @author Thomas Müller <[email protected]> |
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* |
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* @copyright Copyright (c) 2018, ownCloud GmbH |
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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\Files\File; |
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use OCP\Preview\IProvider2; |
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use OCP\Util; |
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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 implements IProvider2 { |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getThumbnail(File $file, $maxX, $maxY, $scalingUp) { |
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$stream = $file->fopen('r'); |
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// Creates \Imagick object from bitmap or vector file |
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try { |
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$bp = $this->getResizedPreview($stream, $maxX, $maxY); |
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} catch (\Exception $e) { |
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Util::writeLog('core', 'ImageMagick says: ' . $e->getmessage(), Util::ERROR); |
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return false; |
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} |
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fclose($stream); |
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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 : false; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function isAvailable(File $file) { |
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return true; |
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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 resource $stream the handle of the file to convert |
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* @param int $maxX |
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* @param int $maxY |
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* |
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* @return \Imagick |
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*/ |
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private function getResizedPreview($stream, $maxX, $maxY) { |
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$bp = new Imagick(); |
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$bp->readImageFile($stream); |
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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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owncloud /
core
