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diff --git a/src/lib/piece_text.h b/src/lib/piece_text.h
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+/*
+    Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#ifndef DCPOMATIC_PIECE_TEXT_H
+#define DCPOMATIC_PIECE_TEXT_H
+
+
+#include "bitmap_text.h"
+#include "dcpomatic_time.h"
+#include "rect.h"
+#include "types.h"
+#include <dcp/subtitle_string.h>
+#include <list>
+
+
+class Image;
+
+
+class PieceText
+{
+public:
+	explicit PieceText (std::weak_ptr<const Content> content, std::weak_ptr<const TextContent> text, dcpomatic::ContentTime time)
+		: _content (content)
+		, _text (text)
+		, _time (time)
+	{}
+
+	std::weak_ptr<const Content> content() const {
+		return _content;
+	}
+
+	std::weak_ptr<const TextContent> text() const {
+		return _text;
+	}
+
+	dcpomatic::ContentTime time () const {
+		return _time;
+	}
+
+private:
+	std::weak_ptr<const Content> _content;
+	std::weak_ptr<const TextContent> _text;
+	dcpomatic::ContentTime _time;
+};
+
+
+class PieceBitmapTextStart : public PieceText
+{
+public:
+	PieceBitmapTextStart (std::weak_ptr<const Content> content, std::weak_ptr<const TextContent> text, dcpomatic::ContentTime time, std::shared_ptr<Image> image, dcpomatic::Rect<double> area)
+		: PieceText (content, text, time)
+		, sub (image, area)
+	{}
+
+	/* Our text, with its rectangle unmodified by any offsets or scales that the content specifies */
+	BitmapText sub;
+};
+
+
+/** A text caption.  We store the time period separately (as well as in the dcp::SubtitleStrings)
+ *  as the dcp::SubtitleString timings are sometimes quite heavily quantised and this causes problems
+ *  when we want to compare the quantised periods to the unquantised ones.
+ */
+class PieceStringTextStart : public PieceText
+{
+public:
+	PieceStringTextStart (std::weak_ptr<const Content> content, std::weak_ptr<const TextContent> text, dcpomatic::ContentTime time, std::list<dcp::SubtitleString> s)
+		: PieceText (content, text, time)
+		, subs (s)
+	{}
+
+	std::list<dcp::SubtitleString> subs;
+};
+
+
+class PieceTextStop : public PieceText
+{
+public:
+	PieceTextStop (std::weak_ptr<const Content> content, std::weak_ptr<const TextContent> text, dcpomatic::ContentTime time)
+		: PieceText (content, text, time)
+	{}
+};
+
+
+#endif