Add subtitle X offset option.

Suggested-by: Thierry Journet

5 files changed, 69 insertions, 26 deletions

diff --git a/src/lib/ffmpeg_content.cc b/src/lib/ffmpeg_content.cc
index f59551d1d..2c5fcf70e 100644
--- a/src/lib/ffmpeg_content.cc
+++ b/src/lib/ffmpeg_content.cc
@@ -62,7 +62,7 @@ FFmpegContent::FFmpegContent (shared_ptr<const Film> f, shared_ptr<const cxml::N
 	: Content (f, node)
 	, VideoContent (f, node)
 	, AudioContent (f, node)
-	, SubtitleContent (f, node)
+	, SubtitleContent (f, node, version)
 {
 	list<cxml::NodePtr> c = node->node_children ("SubtitleStream");
 	for (list<cxml::NodePtr>::const_iterator i = c.begin(); i != c.end(); ++i) {
diff --git a/src/lib/film.cc b/src/lib/film.cc
index 1290cbda2..8690d3ee0 100644
--- a/src/lib/film.cc
+++ b/src/lib/film.cc
@@ -83,8 +83,10 @@ using libdcp::Signer;
 
 /* 5 -> 6
  * AudioMapping XML changed.
+ * 6 -> 7
+ * Subtitle offset changed to subtitle y offset, and subtitle x offset added.
  */
-int const Film::state_version = 6;
+int const Film::state_version = 7;
 
 /** Construct a Film object in a given directory.
  *
diff --git a/src/lib/player.cc b/src/lib/player.cc
index 1c54d0fc5..e661a7b36 100644
--- a/src/lib/player.cc
+++ b/src/lib/player.cc
@@ -521,7 +521,11 @@ Player::content_changed (weak_ptr<Content> w, int property, bool frequent)
 		_have_valid_pieces = false;
 		Changed (frequent);
 
-	} else if (property == SubtitleContentProperty::SUBTITLE_OFFSET || property == SubtitleContentProperty::SUBTITLE_SCALE) {
+	} else if (
+		property == SubtitleContentProperty::SUBTITLE_X_OFFSET ||
+		property == SubtitleContentProperty::SUBTITLE_Y_OFFSET ||
+		property == SubtitleContentProperty::SUBTITLE_SCALE
+		) {
 
 		update_subtitle ();
 		Changed (frequent);
@@ -658,7 +662,8 @@ Player::update_subtitle ()
 	dcpomatic::Rect<double> in_rect = _in_subtitle.rect;
 	libdcp::Size scaled_size;
 
-	in_rect.y += sc->subtitle_offset ();
+	in_rect.x += sc->subtitle_x_offset ();
+	in_rect.y += sc->subtitle_y_offset ();
 
 	/* We will scale the subtitle up to fit _video_container_size, and also by the additional subtitle_scale */
 	scaled_size.width = in_rect.width * _video_container_size.width * sc->subtitle_scale ();
diff --git a/src/lib/subtitle_content.cc b/src/lib/subtitle_content.cc
index 6c0d3af86..8f88574e5 100644
--- a/src/lib/subtitle_content.cc
+++ b/src/lib/subtitle_content.cc
@@ -30,25 +30,34 @@ using boost::shared_ptr;
 using boost::lexical_cast;
 using boost::dynamic_pointer_cast;
 
-int const SubtitleContentProperty::SUBTITLE_OFFSET = 500;
-int const SubtitleContentProperty::SUBTITLE_SCALE = 501;
+int const SubtitleContentProperty::SUBTITLE_X_OFFSET = 500;
+int const SubtitleContentProperty::SUBTITLE_Y_OFFSET = 501;
+int const SubtitleContentProperty::SUBTITLE_SCALE = 502;
 
 SubtitleContent::SubtitleContent (shared_ptr<const Film> f, boost::filesystem::path p)
 	: Content (f, p)
-	, _subtitle_offset (0)
+	, _subtitle_x_offset (0)
+	, _subtitle_y_offset (0)
 	, _subtitle_scale (1)
 {
 
 }
 
-SubtitleContent::SubtitleContent (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node)
+SubtitleContent::SubtitleContent (shared_ptr<const Film> f, shared_ptr<const cxml::Node> node, int version)
 	: Content (f, node)
-	, _subtitle_offset (0)
+	, _subtitle_x_offset (0)
+	, _subtitle_y_offset (0)
 	, _subtitle_scale (1)
 {
 	LocaleGuard lg;
+
+	if (version >= 7) {
+		_subtitle_x_offset = node->number_child<float> ("SubtitleXOffset");
+		_subtitle_y_offset = node->number_child<float> ("SubtitleYOffset");
+	} else {
+		_subtitle_y_offset = node->number_child<float> ("SubtitleOffset");
+	}
 	
-	_subtitle_offset = node->number_child<float> ("SubtitleOffset");
 	_subtitle_scale = node->number_child<float> ("SubtitleScale");
 }
 
@@ -61,8 +70,12 @@ SubtitleContent::SubtitleContent (shared_ptr<const Film> f, vector<shared_ptr<Co
 	for (size_t i = 0; i < c.size(); ++i) {
 		shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (c[i]);
 
-		if (sc->subtitle_offset() != ref->subtitle_offset()) {
-			throw JoinError (_("Content to be joined must have the same subtitle offset."));
+		if (sc->subtitle_x_offset() != ref->subtitle_x_offset()) {
+			throw JoinError (_("Content to be joined must have the same subtitle X offset."));
+		}
+		
+		if (sc->subtitle_y_offset() != ref->subtitle_y_offset()) {
+			throw JoinError (_("Content to be joined must have the same subtitle Y offset."));
 		}
 
 		if (sc->subtitle_scale() != ref->subtitle_scale()) {
@@ -70,7 +83,8 @@ SubtitleContent::SubtitleContent (shared_ptr<const Film> f, vector<shared_ptr<Co
 		}
 	}
 
-	_subtitle_offset = ref->subtitle_offset ();
+	_subtitle_x_offset = ref->subtitle_x_offset ();
+	_subtitle_y_offset = ref->subtitle_y_offset ();
 	_subtitle_scale = ref->subtitle_scale ();
 }
 
@@ -79,18 +93,29 @@ SubtitleContent::as_xml (xmlpp::Node* root) const
 {
 	LocaleGuard lg;
 	
-	root->add_child("SubtitleOffset")->add_child_text (lexical_cast<string> (_subtitle_offset));
+	root->add_child("SubtitleXOffset")->add_child_text (lexical_cast<string> (_subtitle_x_offset));
+	root->add_child("SubtitleYOffset")->add_child_text (lexical_cast<string> (_subtitle_y_offset));
 	root->add_child("SubtitleScale")->add_child_text (lexical_cast<string> (_subtitle_scale));
 }
 
 void
-SubtitleContent::set_subtitle_offset (double o)
+SubtitleContent::set_subtitle_x_offset (double o)
+{
+	{
+		boost::mutex::scoped_lock lm (_mutex);
+		_subtitle_x_offset = o;
+	}
+	signal_changed (SubtitleContentProperty::SUBTITLE_X_OFFSET);
+}
+
+void
+SubtitleContent::set_subtitle_y_offset (double o)
 {
 	{
 		boost::mutex::scoped_lock lm (_mutex);
-		_subtitle_offset = o;
+		_subtitle_y_offset = o;
 	}
-	signal_changed (SubtitleContentProperty::SUBTITLE_OFFSET);
+	signal_changed (SubtitleContentProperty::SUBTITLE_Y_OFFSET);
 }
 
 void
diff --git a/src/lib/subtitle_content.h b/src/lib/subtitle_content.h
index 854647d18..388637688 100644
--- a/src/lib/subtitle_content.h
+++ b/src/lib/subtitle_content.h
@@ -25,7 +25,8 @@
 class SubtitleContentProperty
 {
 public:
-	static int const SUBTITLE_OFFSET;
+	static int const SUBTITLE_X_OFFSET;
+	static int const SUBTITLE_Y_OFFSET;
 	static int const SUBTITLE_SCALE;
 };
 
@@ -33,17 +34,23 @@ class SubtitleContent : public virtual Content
 {
 public:
 	SubtitleContent (boost::shared_ptr<const Film>, boost::filesystem::path);
-	SubtitleContent (boost::shared_ptr<const Film>, boost::shared_ptr<const cxml::Node>);
+	SubtitleContent (boost::shared_ptr<const Film>, boost::shared_ptr<const cxml::Node>, int version);
 	SubtitleContent (boost::shared_ptr<const Film>, std::vector<boost::shared_ptr<Content> >);
 	
 	void as_xml (xmlpp::Node *) const;
 
-	void set_subtitle_offset (double);
+	void set_subtitle_x_offset (double);
+	void set_subtitle_y_offset (double);
 	void set_subtitle_scale (double);
 
-	double subtitle_offset () const {
+	double subtitle_x_offset () const {
 		boost::mutex::scoped_lock lm (_mutex);
-		return _subtitle_offset;
+		return _subtitle_x_offset;
+	}
+
+	double subtitle_y_offset () const {
+		boost::mutex::scoped_lock lm (_mutex);
+		return _subtitle_y_offset;
 	}
 
 	double subtitle_scale () const {
@@ -53,11 +60,15 @@ public:
 	
 private:
 	friend class ffmpeg_pts_offset_test;
-	
+
+	/** x offset for placing subtitles, as a proportion of the container width;
+	 * +ve is further right, -ve is further left.
+	 */
+	double _subtitle_x_offset;
 	/** y offset for placing subtitles, as a proportion of the container height;
-	    +ve is further down the frame, -ve is further up.
-	*/
-	double _subtitle_offset;
+	 *  +ve is further down the frame, -ve is further up.
+	 */
+	double _subtitle_y_offset;
 	/** scale factor to apply to subtitles */
 	double _subtitle_scale;
 };