113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
/*
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* Copyright (C) 2013-2015 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2013 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __CANVAS_IMAGE__
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#define __CANVAS_IMAGE__
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#include <stdint.h>
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#include <boost/shared_ptr.hpp>
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#include <boost/shared_array.hpp>
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#include "canvas/visibility.h"
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#include "canvas/item.h"
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typedef void (*ImageReleaseCallback)(uint8_t *d, void *arg);
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namespace ArdourCanvas {
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class LIBCANVAS_API Image : public Item
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{
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public:
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Image (Canvas *, Cairo::Format, int width, int height);
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Image (Item*, Cairo::Format, int width, int height);
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struct Data {
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Data (uint8_t *d, int w, int h, int s, Cairo::Format fmt)
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: data (d)
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, width (w)
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, height (h)
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, stride (s)
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, format (fmt)
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, destroy_callback(NULL)
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, destroy_arg(NULL)
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{}
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virtual ~Data () {
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if (destroy_callback) {
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destroy_callback(data, destroy_arg);
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} else {
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free(data);
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}
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}
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uint8_t* data;
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int width;
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int height;
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int stride;
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Cairo::Format format;
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ImageReleaseCallback destroy_callback;
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void* destroy_arg;
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};
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/**
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* Returns a shared_ptr to a Data object that can be used to
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* write image data to. The Data object will contain a pointer
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* to the buffer, along with image properties that may be
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* useful during the data writing.
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*
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* Can be called from any thread BUT ..
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*
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* ... to avoid collisions with Image deletion, some synchronization method
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* may be required or the use of shared_ptr<Image> or similar.
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*/
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boost::shared_ptr<Data> get_image (bool allocate_data = true);
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/**
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* Queues a Data object to be used to redraw this Image item
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* at the earliest possible opportunity.
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*
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* May be called from any thread BUT ...
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*
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* ... to avoid collisions with Image deletion, some synchronization method
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* may be required or the use of shared_ptr<Image> or similar.
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*/
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void put_image (boost::shared_ptr<Data>);
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void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
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void compute_bounding_box () const;
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private:
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Cairo::Format _format;
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int _width;
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int _height;
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mutable boost::shared_ptr<Data> _current;
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boost::shared_ptr<Data> _pending;
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mutable bool _need_render;
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mutable Cairo::RefPtr<Cairo::Surface> _surface;
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void accept_data ();
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PBD::Signal0<void> DataReady;
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PBD::ScopedConnectionList data_connections;
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};
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}
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#endif
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