Split image provider in one sub-class per media type

config/config.sample.php

  *
  * The following providers are enabled by default:
  *
- *  - OC\Preview\Image
+ *  - OC\Preview\PNG
+ *  - OC\Preview\JPEG
+ *  - OC\Preview\GIF
+ *  - OC\Preview\BMP
+ *  - OC\Preview\XBitmap
  *  - OC\Preview\MarkDown
  *  - OC\Preview\MP3
  *  - OC\Preview\TXT
  *  - OC\Preview\StarOffice
  */
 'enabledPreviewProviders' => array(
-	'OC\Preview\Image',
+	'OC\Preview\PNG',
+	'OC\Preview\JPEG',
+	'OC\Preview\GIF',
+	'OC\Preview\BMP',
+	'OC\Preview\XBitmap',
 	'OC\Preview\MP3',
 	'OC\Preview\TXT',
 	'OC\Preview\MarkDown'

lib/private/preview/bmp.php

+<?php
+/**
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Preview;
+
+class BMP extends Image {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/bmp/';
+	}
+}

lib/private/preview/gif.php

+<?php
+/**
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Preview;
+
+class GIF extends Image {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/gif/';
+	}
+}

lib/private/preview/image.php

 <?php
 /**
  * @author Georg Ehrke <georg@owncloud.com>
- * @author Georg Ehrke <georg@ownCloud.com>
+ * @author Olivier Paroz <owncloud@interfasys.ch>
  * @author Joas Schilling <nickvergessen@owncloud.com>
  * @author Morris Jobke <hey@morrisjobke.de>
  * @author Thomas Müller <thomas.mueller@tmit.eu>
  */
 namespace OC\Preview;
 
-class Image extends Provider {
-	/**
-	 * {@inheritDoc}
-	 */
-	public function getMimeType() {
-		return '/image\/(?!tiff$)(?!svg.*).*/';
-	}
+abstract class Image extends Provider {
 
 	/**
 	 * {@inheritDoc}

lib/private/preview/jpeg.php

+<?php
+/**
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Preview;
+
+class JPEG extends Image {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/jpeg/';
+	}
+}

lib/private/preview/png.php

+<?php
+/**
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Preview;
+
+class PNG extends Image {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/png/';
+	}
+}

lib/private/preview/xbitmap.php

+<?php
+/**
+ * @author Olivier Paroz <owncloud@interfasys.ch>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Preview;
+
+class XBitmap extends Image {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/x-xbitmap/';
+	}
+}

lib/private/previewmanager.php

 	 * List of enabled default providers
 	 *
 	 * The following providers are enabled by default:
-	 *  - OC\Preview\Image
+	 *  - OC\Preview\PNG
+	 *  - OC\Preview\JPEG
+	 *  - OC\Preview\GIF
+	 *  - OC\Preview\BMP
+	 *  - OC\Preview\XBitmap
 	 *  - OC\Preview\MarkDown
 	 *  - OC\Preview\MP3
 	 *  - OC\Preview\TXT
 			return $this->defaultProviders;
 		}
 
-		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', [
-			'OC\Preview\Image',
+		$imageProviders = [
+			'OC\Preview\PNG',
+			'OC\Preview\JPEG',
+			'OC\Preview\GIF',
+			'OC\Preview\BMP',
+			'OC\Preview\XBitmap'
+		];
+
+		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
 			'OC\Preview\MarkDown',
 			'OC\Preview\MP3',
 			'OC\Preview\TXT',
-		]);
+		], $imageProviders));
+
+		if (in_array('OC\Preview\Image', $this->defaultProviders)) {
+			$this->defaultProviders = array_merge($this->defaultProviders, $imageProviders);
+		}
+		$this->defaultProviders = array_unique($this->defaultProviders);
 		return $this->defaultProviders;
 	}
 
 
 		$this->registerCoreProvider('OC\Preview\TXT', '/text\/plain/');
 		$this->registerCoreProvider('OC\Preview\MarkDown', '/text\/(x-)?markdown/');
-		$this->registerCoreProvider('OC\Preview\Image', '/image\/(?!tiff$)(?!svg.*).*/');
+		$this->registerCoreProvider('OC\Preview\PNG', '/image\/png/');
+		$this->registerCoreProvider('OC\Preview\JPEG', '/image\/jpeg/');
+		$this->registerCoreProvider('OC\Preview\GIF', '/image\/gif/');
+		$this->registerCoreProvider('OC\Preview\BMP', '/image\/bmp/');
+		$this->registerCoreProvider('OC\Preview\XBitmap', '/image\/x-xbitmap/');
 		$this->registerCoreProvider('OC\Preview\MP3', '/audio\/mpeg/');
 
 		// SVG, Office and Bitmap require imagick