Move VideoContentScale to its own file.

1 files changed, 171 insertions, 0 deletions

diff --git a/src/lib/video_content_scale.cc b/src/lib/video_content_scale.cc
new file mode 100644
index 000000000..e603582b8
--- /dev/null
+++ b/src/lib/video_content_scale.cc
@@ -0,0 +1,171 @@
+/*
+    Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
+
+    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 <boost/optional.hpp>
+#include <libxml++/libxml++.h>
+#include <libcxml/cxml.h>
+#include "video_content_scale.h"
+#include "ratio.h"
+#include "safe_stringstream.h"
+#include "util.h"
+
+#include "i18n.h"
+
+using std::vector;
+using std::string;
+using boost::shared_ptr;
+using boost::optional;
+
+vector<VideoContentScale> VideoContentScale::_scales;
+
+VideoContentScale::VideoContentScale (Ratio const * r)
+	: _ratio (r)
+	, _scale (true)
+{
+
+}
+
+VideoContentScale::VideoContentScale ()
+	: _ratio (0)
+	, _scale (false)
+{
+
+}
+
+VideoContentScale::VideoContentScale (bool scale)
+	: _ratio (0)
+	, _scale (scale)
+{
+
+}
+
+VideoContentScale::VideoContentScale (shared_ptr<cxml::Node> node)
+	: _ratio (0)
+	, _scale (true)
+{
+	optional<string> r = node->optional_string_child ("Ratio");
+	if (r) {
+		_ratio = Ratio::from_id (r.get ());
+	} else {
+		_scale = node->bool_child ("Scale");
+	}
+}
+
+void
+VideoContentScale::as_xml (xmlpp::Node* node) const
+{
+	if (_ratio) {
+		node->add_child("Ratio")->add_child_text (_ratio->id ());
+	} else {
+		node->add_child("Scale")->add_child_text (_scale ? "1" : "0");
+	}
+}
+
+string
+VideoContentScale::id () const
+{
+	SafeStringStream s;
+	
+	if (_ratio) {
+		s << _ratio->id ();
+	} else {
+		s << (_scale ? "S1" : "S0");
+	}
+	
+	return s.str ();
+}
+
+string
+VideoContentScale::name () const
+{
+	if (_ratio) {
+		return _ratio->nickname ();
+	}
+
+	if (_scale) {
+		return _("No stretch");
+	}
+
+	return _("No scale");
+}
+
+VideoContentScale
+VideoContentScale::from_id (string id)
+{
+	Ratio const * r = Ratio::from_id (id);
+	if (r) {
+		return VideoContentScale (r);
+	}
+
+	if (id == "S0") {
+		return VideoContentScale (false);
+	}
+
+	return VideoContentScale (true);
+}
+		
+/** @param display_container Size of the container that we are displaying this content in.
+ *  @param film_container The size of the film's image.
+ */
+libdcp::Size
+VideoContentScale::size (shared_ptr<const VideoContent> c, libdcp::Size display_container, libdcp::Size film_container) const
+{
+	if (_ratio) {
+		return fit_ratio_within (_ratio->ratio (), display_container);
+	}
+
+	libdcp::Size const ac = c->video_size_after_crop ();
+
+	/* Force scale if the film_container is smaller than the content's image */
+	if (_scale || film_container.width < ac.width || film_container.height < ac.height) {
+		return fit_ratio_within (ac.ratio (), display_container);
+	}
+
+	/* Scale the image so that it will be in the right place in film_container, even if display_container is a
+	   different size.
+	*/
+	return libdcp::Size (
+		c->video_size().width  * float(display_container.width)  / film_container.width,
+		c->video_size().height * float(display_container.height) / film_container.height
+		);
+}
+
+void
+VideoContentScale::setup_scales ()
+{
+	vector<Ratio const *> ratios = Ratio::all ();
+	for (vector<Ratio const *>::const_iterator i = ratios.begin(); i != ratios.end(); ++i) {
+		_scales.push_back (VideoContentScale (*i));
+	}
+
+	_scales.push_back (VideoContentScale (true));
+	_scales.push_back (VideoContentScale (false));
+}
+
+bool
+operator== (VideoContentScale const & a, VideoContentScale const & b)
+{
+	return (a.ratio() == b.ratio() && a.scale() == b.scale());
+}
+
+bool
+operator!= (VideoContentScale const & a, VideoContentScale const & b)
+{
+	return (a.ratio() != b.ratio() || a.scale() != b.scale());
+}