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diff --git a/src/wrap.h b/src/wrap.h
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+/*
+ * wrap.h
+ *
+ * Colloquium - A tiny presentation program
+ *
+ * Copyright (c) 2012 Thomas White <taw@bitwiz.org.uk>
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef WRAP_H
+#define WRAP_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "frame.h"
+
+
+enum wrap_box_type
+{
+	WRAP_BOX_PANGO,
+	WRAP_BOX_IMAGE
+};
+
+
+/* Possible types of space following a wrap box */
+enum wrap_box_space
+{
+	WRAP_SPACE_INTERWORD,  /* Normal inter-word space */
+	WRAP_SPACE_NONE,       /* Box ends with an explicit hyphen or an SC
+	                        * block boundary */
+	WRAP_SPACE_EOP         /* End of paragraph */
+	/* TODO: Space between sentences etc */
+};
+
+
+/* A wrap box is a run of content - could be text, an image or so one - that is
+ * one logical unit as far as Colloquium is concerned.  It might consist of
+ * multiple units, for example, in Pango's mind. */
+struct wrap_box
+{
+	enum wrap_box_type type;
+
+	/* Pango units */
+	int width;
+	int height;
+	int ascent;
+
+	enum wrap_box_space space;  /* Type of "space" following box */
+
+	/* For type == WRAP_BOX_PANGO */
+	PangoGlyphString *glyphs;
+	PangoFont *font;
+	char *text;
+	double col[4];  /* rgba colour */
+
+	/* For type == WRAP_BOX_IMAGE */
+	/* Nothing yet */
+};
+
+
+struct wrap_line
+{
+	int width;
+	int height;  /* Pango units */
+	int ascent;  /* Pango units */
+
+	int n_boxes;
+	int max_boxes;
+	struct wrap_box *boxes;
+
+	size_t sc_offset;
+};
+
+
+extern int wrap_contents(struct frame *fr, PangoContext *pc);
+
+extern void get_cursor_pos(struct frame *fr, size_t pos,
+                           double *xposd, double *yposd, double *line_height);
+
+
+#endif	/* WRAP_H */