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diff --git a/gcc/text-art/canvas.h b/gcc/text-art/canvas.h
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+/* Canvas for random-access procedural text art.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+This file is part of GCC.
+
+GCC 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, or (at your option)
+any later version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TEXT_ART_CANVAS_H
+#define GCC_TEXT_ART_CANVAS_H
+
+#include "text-art/types.h"
+
+namespace text_art {
+
+class canvas;
+
+/* A 2 dimensional grid of text cells (a "canvas"), which
+   can be written to ("painted") via random access, and then
+   written out to a pretty_printer once the picture is complete.
+
+   Each text cell can be styled independently (colorization,
+   URLs, etc).  */
+
+class canvas
+{
+ public:
+  typedef styled_unichar cell_t;
+  typedef size<class canvas> size_t;
+  typedef coord<class canvas> coord_t;
+  typedef range<class canvas> range_t;
+  typedef rect<class canvas> rect_t;
+
+  canvas (size_t size, const style_manager &style_mgr);
+
+  size_t get_size () const { return m_cells.get_size (); }
+
+  void paint (coord_t coord, cell_t c);
+  void paint_text (coord_t coord, const styled_string &text);
+
+  void fill (rect_t rect, cell_t c);
+  void debug_fill ();
+
+  void print_to_pp (pretty_printer *pp,
+		    const char *per_line_prefix = NULL) const;
+  void debug (bool styled) const;
+
+  const cell_t &get (coord_t coord) const
+  {
+    return m_cells.get (coord);
+  }
+
+ private:
+  int get_final_x_in_row (int y) const;
+
+  array2<cell_t, size_t, coord_t> m_cells;
+  const style_manager &m_style_mgr;
+};
+
+} // namespace text_art
+
+#endif /* GCC_TEXT_ART_CANVAS_H */