2 Copyright (C) 2013 Paul Davis
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.
19 #ifndef __CANVAS_IMAGE__
20 #define __CANVAS_IMAGE__
23 #include <boost/shared_ptr.hpp>
24 #include <boost/shared_array.hpp>
26 #include "canvas/item.h"
28 namespace ArdourCanvas {
30 class Image : public Item
33 Image (Group *, Cairo::Format, int width, int height);
36 Data (boost::shared_array<uint8_t> d, int w, int h, int s, Cairo::Format fmt)
44 boost::shared_array<uint8_t> data;
52 * Returns a shared_ptr to a Data object that can be used to
53 * write image data to. The Data object will contain a pointer
54 * to the buffer, along with image properties that may be
55 * useful during the data writing.
57 * Can be called from any thread BUT ..
59 * ... to avoid collisions with Image deletion, some synchronization method
60 * may be required or the use of shared_ptr<Image> or similar.
62 boost::shared_ptr<Data> get_image ();
65 * Queues a Data object to be used to redraw this Image item
66 * at the earliest possible opportunity.
68 * May be called from any thread BUT ...
70 * ... to avoid collisions with Image deletion, some synchronization method
71 * may be required or the use of shared_ptr<Image> or similar.
73 void put_image (boost::shared_ptr<Data>);
75 void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
76 void compute_bounding_box () const;
79 Cairo::Format _format;
83 mutable boost::shared_ptr<Data> _current;
84 boost::shared_ptr<Data> _pending;
85 mutable bool _need_render;
86 mutable Cairo::RefPtr<Cairo::Surface> _surface;
89 PBD::Signal0<void> DataReady;
90 PBD::ScopedConnectionList data_connections;