2 Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /** @file src/lib/image_proxy.h
21 * @brief ImageProxy and subclasses.
24 #include <boost/shared_ptr.hpp>
25 #include <boost/filesystem.hpp>
27 #include <libxml++/libxml++.h>
38 * @brief A class which holds an Image, and can produce it on request.
40 * This is so that decoding of source images can be postponed until
41 * the encoder thread, where multi-threading is happening, instead
42 * of happening in a single-threaded decoder.
44 * For example, large TIFFs are slow to decode, so this class will keep
45 * the TIFF data TIFF until such a time that the actual image is needed.
46 * At this point, the class decodes the TIFF to an Image.
51 ImageProxy (boost::shared_ptr<Log> log);
53 virtual boost::shared_ptr<Image> image () const = 0;
54 virtual void add_metadata (xmlpp::Node *) const = 0;
55 virtual void send_binary (boost::shared_ptr<Socket>) const = 0;
58 boost::shared_ptr<Log> _log;
61 class RawImageProxy : public ImageProxy
64 RawImageProxy (boost::shared_ptr<Image>, boost::shared_ptr<Log> log);
65 RawImageProxy (boost::shared_ptr<cxml::Node> xml, boost::shared_ptr<Socket> socket, boost::shared_ptr<Log> log);
67 boost::shared_ptr<Image> image () const;
68 void add_metadata (xmlpp::Node *) const;
69 void send_binary (boost::shared_ptr<Socket>) const;
72 boost::shared_ptr<Image> _image;
75 class MagickImageProxy : public ImageProxy
78 MagickImageProxy (boost::filesystem::path, boost::shared_ptr<Log> log);
79 MagickImageProxy (boost::shared_ptr<cxml::Node> xml, boost::shared_ptr<Socket> socket, boost::shared_ptr<Log> log);
81 boost::shared_ptr<Image> image () const;
82 void add_metadata (xmlpp::Node *) const;
83 void send_binary (boost::shared_ptr<Socket>) const;
87 mutable boost::shared_ptr<Image> _image;
90 boost::shared_ptr<ImageProxy> image_proxy_factory (boost::shared_ptr<cxml::Node> xml, boost::shared_ptr<Socket> socket, boost::shared_ptr<Log> log);