1 files changed, 97 insertions, 0 deletions
diff --git a/libs/canvas/image.cc b/libs/canvas/image.cc
new file mode 100644
index 0000000000..32e453dc30
--- /dev/null
+++ b/libs/canvas/image.cc
@@ -0,0 +1,97 @@
+/*
+    Copyright (C) 2013 Paul Davis
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "canvas/image.h"
+
+#include "gtkmm2ext/gui_thread.h"
+
+using namespace ArdourCanvas;
+
+Image::Image (Group* group, Cairo::Format fmt, int width, int height)
+	: Item (group)
+	, _format (fmt)
+	, _width (width)
+	, _height (height)
+	, _need_render (false)
+{
+	DataReady.connect (data_connections, MISSING_INVALIDATOR, boost::bind (&Image::accept_data, this), gui_context());
+}
+
+void 
+Image::render (Rect const& area, Cairo::RefPtr<Cairo::Context> context) const
+{
+	if (_need_render && _pending) {
+		_surface = Cairo::ImageSurface::create (_pending->data,
+							_pending->format,
+							_pending->width,
+							_pending->height,
+							_pending->stride);
+		_current = _pending;
+	}
+	
+	Rect self = item_to_window (Rect (0, 0, _width, _height));
+	boost::optional<Rect> draw = self.intersection (area);
+
+	if (_surface && draw) {
+		context->set_source (_surface, self.x0, self.y0);
+		context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
+		context->fill ();
+	}
+}
+
+void
+Image::compute_bounding_box () const
+{
+	_bounding_box = boost::optional<Rect> (Rect (0, 0, _width, _height));
+	_bounding_box_dirty = false;
+}
+
+boost::shared_ptr<Image::Data>
+Image::get_image (bool allocate_data)
+{
+	/* can be called by any thread */
+
+	int stride = Cairo::ImageSurface::format_stride_for_width (_format, _width);
+	if (allocate_data)  {
+		boost::shared_ptr<Data> d (new Data (new uint8_t[stride*_height], _width, _height, stride, _format));
+		return d;
+	} else {
+		boost::shared_ptr<Data> d (new Data (NULL, _width, _height, stride, _format));
+		return d;
+	}
+}
+
+void
+Image::put_image (boost::shared_ptr<Data> d)
+{
+	/* can be called by any thread */
+
+	_pending = d;
+	DataReady (); /* EMIT SIGNAL */
+}
+
+void
+Image::accept_data () 
+{
+	/* must be executed in gui thread */
+
+	begin_change ();
+	_need_render = true;
+	end_change (); // notify canvas that we need redrawing
+}	     
+